CN100514430C - Device for video display and method therefor - Google Patents

Abstract

A video display device emits a first light emission component occupying D% time of the vertical period of a video signal a having S% light emission intensity of the light emission intensity of the pixel displayed in the vertical period and a second light emission component occupying (100 - D)% time of the vertical period and having (100 - S)% light emission intensity of the light intensity of the pixel displayed in the vertical period. The values of D and S are set so as to satisfy the condition A: 62 <= S < 100 and 0 < D < 100 and D < S or the condition B: 48 < S < 62 and D <= (S - 48)/0.23.

Description

Device for video display and video display packing

Technical field

The present invention relates to device for video display, relating in particular to improvement is the method for the display quality of device for video display representative, that have maintenance electro-optical conversion characteristic with the liquid crystal indicator.

Background technology

In recent years, to the large-scale tv machine, use the display as representative from small mobile terminals on a large scale with extensively universal LCD (liquid crystal indicator).

The electro-optical conversion characteristic of the LCD of driven with active matrix and organic EL (electroluminescent device) is different with CRT (cathode-ray tube (CRT)), makes the video demonstration phase maintenance constant of the luminosity of display frame to 1 frame on the principle.This characteristics of luminescence is called maintenance.

Current, this maintenance drives the live image quality deterioration that causes that blurs, trails, is infected with that causes and is a problem.Document as the relevant LCD live image quality deterioration of statement, for example non-patent literature 1 (" liquid crystal is modified live image and shown; PDP resists with low power consumption ", Nikkei electron technology, 11-18 are arranged, 110 pages, 2002), (" the high-quality live image display technique of LCD " shows between month non-patent literature 2, June number, 100 pages, 2003).

In a kind of method of improving LCD hangover, there is simulation intermittently to light the method for the characteristics of luminescence (impulse type is lighted).For example " liquid crystal indicator " of patent documentation 1 (Japan's patent disclosure is put down 11-No. 20285 communiques, on July 30th, 1999 open) makes back-lighting light, extinguish, and carries out impulse type and lights, and the illumination liquid crystal display part makes the clean cut of live image." display board and driving method thereof and the television projector " of patent documentation 2 (Japan's patent disclosure is put down 3-No. 284791 communiques, and on Dec 16th, 1991 is open) proposes the output that Optic gate covers projector's lamp, to form the luminous scheme of impulse type.

Here, illustrate that with Figure 114 maintenance drives the occurring principle of the hangover that causes.Figure 114 illustrates to show in black background among the LCD that longitudinal length is 3 pixels, a lateral length white object arbitrarily, and this object is with the state of the past screen of the speed of every frame 1 pixel below constant speed movement.

(a) part of Figure 114 is the luminescent waveform of light source, and the longitudinal axis is represented luminosity, the transverse axis express time.If light source and time are irrelevant, are luminosity constant continuous light emitting-type light sources.

(b) part of Figure 114 is that LCD goes up the profile of objects displayed in certain moment (part in zone shown in the nicking in (c) part of Figure 114), and transverse axis is represented representation space, and the longitudinal axis is represented transmissivity.Shown in Figure 114 (b) part, transmissivity sharply changes the space.

(c) part of Figure 114 is the mode chart of expression movement of objects situation (transverse axis is the time, and the longitudinal axis is the space).Along with the process of time, the cross hatch part of Figure 114 (c) part shows object successively, and this part is luminous with the screen intensity of the transmissivity decision of pixel.

Here, object is with respect to spatial axes, and the direction of the arrow No.1 1 in (c) part of Figure 114 moves.So the observer simultaneously pays close attention to this mobiles, during simultaneously with eye tracking, be equivalent to the observer sight line is moved toward the direction of arrow No.1 2, and observe object.Therefore, on observer's nethike embrane, add up (being averaged) brightness variation along arrow No.1 2.Its result, the observer sees object as (d) part of Figure 114.

That is, shown in (e) part of Figure 114, in observer's eye, show the middle body of object with certain brightness, but can find out that brightness is along with the ora terminalis near object reduces gradually.In (e) part of Figure 114, the transverse axis representation space, the longitudinal axis is represented brightness.

As indicated above such, produce hangover in the live image.That is, when to Figure 114 (b) part and (e) part compares, distinguish that near the brightness the ora terminalis of the object that the observer sees reduces, thereby profile variations.The observer with this brightness step be identified as fuzzy, trail, be infected with.

And, in the hangover improvement method that maintenance drives, the method for pulse point bright light source is arranged.Below, enumerate the luminous look-ahead technique of impulse type.

In " image display " of patent documentation 3 (Japan's patent disclosure is put down 9-No. 325715 communiques, and on Dec 16th, 1997 is open), to observer's light path, optical gate is set at light source, the latter half in 1 frame period of limiting telecommunication signal.

(Japan's patent disclosure is put down 8-No. 500915 communiques to patent documentation 4, on January 30th, 1996 is open) " driving method of matrix display system and this system " in, after proposition is carried out addressing in the time shorter than the field duration of vision signal to display message, stable from the response of liquid crystal, liquid crystal board is thrown light on.

The principle of the luminous improvement hangover of impulse type then, is described with Figure 115.Figure 115 is identical with Figure 114, and the state that mobiles moves toward the screen below also is shown.Shown in (a) part of Figure 15, during impulse type was luminous, it is luminous that light source carries out light on and off.Therefore, the brightness of LCD is the product of the transmissivity of the pixel on light-source brightness and the LCD plate, so only obtain the brightness of lcd screen during light source igniting.

Therefore, shown in (c) part of Figure 115, the position that adds cross hatch on the object is luminous.In observer's eye to cross hatch needn't the brightness integration, as Figure 115 (d) part, see object.

Figure 115 (e) part illustrates the brightness of the object shown in (d) part of Figure 115.Shown in Figure 115 (e) part, distinguish object that the observer sees along with ora terminalis near this object, brightness reduces.Yet.(e) part of Figure 115 (e) part and Figure 114 is relatively then distinguished the brightness variation shown in (e) part of Figure 115, and its slope is precipitous.Therefore, distinguishing that impulse type is luminous reduces hangover (soft edge, be infected with).

As the luminous luminous phase place of the impulse type of prior art, be the latter half that upgrades the cycle period of pixel transmission rate with respect to vision signal.Be the response of index function the time response of liquid crystal, has time constant, so the state of the transmissivity that non-instantaneous formation is wished.Therefore, the optimal luminescent phase place of prior art is that transmissivity is upgraded latter half regularly, and the observer is difficult to see variation liquid crystal midway.

Patent documentation 5 (2002-No. 287696 communiques of Japan's patent disclosure, on October 4th, 2002 is open) " display device " in the organic EL display device of active driving, TFT is inserted into separately between the TFT grid of maintenance electric capacity that unit according to pixels is provided with and driving organic EL.And, be right after after the non-select time of pixel begins and be shorter than in the time in 1 frame period, make the TFT conducting of insertion, the organic EL circulating current through after the stipulated time, makes the TFT blocking-up, thereby the electric current of organic EL is stopped.Utilize this causing, the characteristics of luminescence that makes the maintenance display element prevents movable fuzzy near impulse type.

Like this, organic EL is different with common liquid crystals, and its response speed is fast, thereby the method for taking under many situations is to be right after the electric current that circulation is wished behind non-select time, make it luminous, stop with some parts then or suppress luminous, thereby make maintenance luminous luminous near impulse type.

Yet, carry out above-mentioned impulse type when showing, produce the picture quality obstacle that is called flicker.This flicker obstacle produces remarkable harmful effect to the observer, such as the reason that becomes eye fatigue etc.Especially along with the improvement of LCD display qualities such as screen intensity rising, giant-screenization, the observer discerns this obstacle easily.

And, owing to improve the live image hangover and the obstacle existence balance relation that reduces to glimmer, can not solve live image hangover and flicker obstacle simultaneously.Below, with Figure 116 (a)～Figure 116 (i) and Figure 117, further specify this balance relation.

It is 25% o'clock led pulse waveform, live image hangover amount and flicker amount that Figure 116 (a), Figure 116 (b) and Figure 116 (c) illustrate duty factor respectively.Equally, duty factor is shown respectively is 50% o'clock led pulse waveform, live image hangover amount and flicker amount for Figure 116 (d), Figure 116 (e) and Figure 116 (f).It is 75% o'clock led pulse waveform, live image hangover amount and flicker amount that Figure 116 (g), Figure 116 (h) and Figure 116 (i) illustrate duty factor respectively.Duty factor is meant the ratio of lighting paired pulses cycle time.

The pulse waveform of Figure 116 (a), Figure 116 (d), Figure 116 (g) presents the waveform of lighting of light source, these waveforms be " height " during, light source igniting.Adjust high-high brightness, make the aggregate-value unanimity of luminosity between each duty factor.

Hangover amount when Figure 116 (b), Figure 116 (e), Figure 116 (h) illustrate execution with the luminous improvement hangover of the impulse type of Figure 115 explanation respectively to each duty factor.Among these figure, the steeper slopes that brightness changes means that improving moving picture quality is big more, and hangover (live image is fuzzy) is more little.

Figure 116 (c), Figure 116 (f), Figure 116 (i) illustrate the flicker amount.The longitudinal axis is the spectral intensity with respect to frequency, and transverse axis is a frequency.This flicker amount is that being transformed into frequency axis derived after each pulse waveform of Figure 116 (a), Figure 116 (d), Figure 116 (g) was carried out Fourier transform.

For example, the vision signal that is input to display device is a ntsc video signal, and then with 60 hertz cycle repetition pulse waveform, thereby 1 subharmonic behind the Fourier transformation computation also is 60 hertz.So 1 subharmonic is big more to the ratio of DC (direct current) component, mean that the flicker obstacle is big more.

Distinguish that from Figure 116 hangover amount and flicker amount form the balance relation.That is, when increasing duty factor in order to reduce the flicker amount, though the flicker amount reduces, the hangover amount increases, and the improving moving picture quality effect reduces.Otherwise, reducing duty factor when reducing the hangover amount, the flicker amount increases.

Figure 117 (a) is the figure of relation that the duty factor of flicker amount and light source luminescent waveform is shown.Here, with the form of sampling function sin (x) ÷ x represent duty factor x pulse waveform 1 subharmonic size.Therefore, duty factor is more little, and it is big more to glimmer.

Figure 117 (b) is the figure of relation that the duty factor of hangover amount and light source luminescent waveform is shown.Here, the hangover amount is defined as: see the slope that this contour of object brightness changes when recognizing mobile object.Shown in Figure 117 (b), hangover amount and duty factor x are inversely proportional to.Therefore, we can say that duty factor is more little, the improving moving picture quality effect is big more.

Figure 118 is the hangover amount with the transverse axis, and the longitudinal axis is the flicker amount, and Figure 117 (a) and two figure of Figure 118 (b) are combined into one.But for the hangover amount, because human eye sensitivity, the longitudinal axis of the waveform that Figure 114 (e) illustrate is provided with 15% to 85% threshold value, and the hangover amount is defined as the space extension of hangover in this scope.

In the curve of Figure 118, the point of hangover amount=0.7, flicker amount=0 is the characteristic of general maintenance LCD.When adopting light technology existing intermittence, the value of hangover amount and flicker amount moves on the curve of Figure 118 with duty factor.That is, along with reducing duty factor, the hangover amount reduces, and improves the live image characteristic, but the flicker amount increases.

Distinguishing from Figure 117 and Figure 118, is the balance relation with respect to the hangover amount of duty factor and the relation of flicker amount, so can not solve live image hangover and flicker obstacle simultaneously.Yet,, just can improve live image hangover and flicker obstacle simultaneously if can move described curve toward the No.1 direction of the blank arrow of Figure 118.

The present invention finishes in view of the above problems, and its purpose is to provide a kind of device for video display that can improve live image hangover and flicker obstacle simultaneously.

Summary of the invention

In order to solve above-mentioned problem, device for video display of the present invention, by brightness according to the vision signal modulated pixels, show video, wherein, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And (the time of 100-D) % of occupying the vertical cycle of described vision signal, and (the 2nd luminous component of the luminous intensity of 100-S) % with luminous intensity of the pixel that shows in this vertical cycle, by controlling described the 1st luminophor and described the 2nd luminophor, make the value of described D and S satisfy following condition: condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23.

In the above-mentioned composition,, represent luminous strength ratio with S with the duty factor that D represents the 1st luminous component and the 2nd luminous component.Researchs such as the inventor change duty factor D and luminous strength ratio S and the hangover amount and the flicker amount that obtain, and the experience that the result obtains is: by setting duty factor D and luminous strength ratio S for satisfy condition A and condition B, can improve hangover amount and flicker amount simultaneously.Therefore, according to the device for video display of above-mentioned composition, can improve hangover amount and flicker amount simultaneously.

Again, in order to solve above-mentioned problem, device for video display of the present invention by the brightness according to the vision signal modulated pixels, shows video, wherein, has the video display unit of setting the transmissivity of pixel according to described vision signal; Synchronous with the vertical synchronizing signal of described vision signal, and occupy time of D% of the vertical cycle of described vision signal, and have the pixel that shows in this vertical cycle luminous intensity S1% luminous intensity, send the 1st light source body that presents with the intermittent light of the synchronous pulse type luminous intensity waveform of described vision signal; And whole (times of (100-D) %) of occupying the vertical cycle of described vision signal, and (the 2nd luminophor luminous intensity of 100-S1) %, that send the lasting light that presents constant luminous intensity with luminous intensity of the pixel that shows in this vertical cycle, utilize and mix the illumination light that obtains behind described intermittent light and the described lasting light, the described video display unit that throws light on is also controlled described the 1st luminophor and described the 2nd luminophor simultaneously.

According to above-mentioned composition, will mix the light that obtains behind the lasting light that intermittent light that the 1st light source body sends and the 2nd light source body send as illumination light.Therefore, the illumination light that light source body of the present invention obtains simultaneously utilizes lasting light to keep constant luminous intensity, one side the time discontinuous of sending intermittent light pick up luminous intensity.

So, when utilizing video display unit of the present invention to show mobile object, use the throw light on profile of this object of the luminous intensity corresponding with lasting light and these two kinds of luminous intensities of intermittent light.Thereby, utilize to comprise brightness only changes the demonstration mobile objects to 2 kinds of brightness of the part of change to the difference signal of the part of change and brightness and intermittent light with lasting light profile.

Its result shows that the observer only can not discern contrast with lasting light to the part of change to brightness, only can discern brightness and intermittent light and the lasting light contrast to the part of change in the video of mobile object profile.Thereby, can improve the live image hangover that produces when showing mobile object.

Affirmations such as the inventor: in the illumination light that light source body of the present invention obtains,, just can reduce the flicker amount if adjust the duty factor of intermittent light.For example the duty factor with intermittent light is set at 20%.Lasting light brightness is set at 20% to the ratio of illumination light brightness, and just making in the past, 90% flicker amount is reduced to 75%.

As mentioned above, the light that device for video display of the present invention owing to will mix obtains behind intermittent light and the lasting light can improve the live image hangover and the obstacle that glimmers simultaneously as illumination light.

Specifically send each intermittent light and lasting light respectively by corresponding light source in the 1st light source body and the 2nd light source body.

Therefore, the 1st light source body can be optimized, the 2nd light source body can be optimized to optimize the luminance of lasting light to optimize the luminance of intermittent light.Because independent optimization intermittent light and lasting light luminance separately realize reducing cost by simplifying the circuit composition again easily like this, and the reliability of circuit is improved.

Again, in order to solve above-mentioned problem, device for video display of the present invention, by brightness according to the vision signal modulated pixels, show video, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And (the time of 100-D) % of occupying the vertical cycle of described vision signal, and (the 2nd luminous component of the luminous intensity of 100-S) % with luminous intensity of the pixel that shows in this vertical cycle, have according to described vision signal, detect the carry over detection part of the carry over amount of described video, according to described carry over amount, change the value of described S or D.

Make the video signal delay frame period with frame memory etc., and according to described delay after the residual quantity mutually of signal calculate the carry over amount.Perhaps calculate the average level of video, calculate the carry over amount according to the interframe phase residual quantity of average level, thereby detect this amount.

Detected carry over amount be vision signal be the activity of unit with the field.By utilizing carry over amount control luminous strength ratio S and duty factor D, can realize the improvement of best hangover amount and flicker amount.

Again, in order to solve above-mentioned problem, device for video display of the present invention, by brightness according to the vision signal modulated pixels, show video, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And (the time of 100-D) % of occupying the vertical cycle of described vision signal, and (the 2nd luminous component of the luminous intensity of 100-S) % with luminous intensity of the pixel that shows in this vertical cycle, have according to described vision signal, detect the average level detection part of the average level of described video, according to described average level, change the value of described S or D.

Moreover, device for video display of the present invention by the brightness according to the vision signal modulated pixels, shows video, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And (the time of 100-D) % of occupying the vertical cycle of described vision signal, and (the 2nd luminous component of the luminous intensity of 100-S) % with luminous intensity of the pixel that shows in this vertical cycle, have according to described vision signal, detect the histogrammic histogram detection part of described video, according to described histogram, change the value of described S or D.

That is, not only obtain bright, the dark information of picture, thereby can realize the improvement of best hangover amount and flicker amount from the activity (the interframe difference of average level) of the realization that shows but also from absolute value, the Luminance Distribution (histogram) of average level.

In order to solve above-mentioned existing problem, device for video display of the present invention, by brightness according to the vision signal modulated pixels, show video, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make described D and S satisfy following condition A or condition B,

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

If the ratio of the time at the light emission period center from the timing that starts described vertical cycle to described the 1st luminous component to described vertical cycle is P%,

Make D/2≤P≤(100-D/2) and 0＜D＜100.

In the above-mentioned composition, the luminous phase place P% of the 1st luminous component in the 1st luminous component and the 2nd luminous component and duty factor D% set for satisfy D/2≤P≤(100-D/2) and the condition of 0＜D＜100, thereby can realize taking into account and improve the live image hangover and reduce the obstacle that glimmers.The flicker obstacle not only makes the user feel unpleasant, and causes harmful effects such as decreased attention and eye fatigue, but according to the present invention, can prevent these harmful effects.Moreover for the display quality of the device for video display that improves giant-screenization, high brightnessization, the obstacle that reduces to glimmer is integral.Like this, according to the present invention, can provide the best image quality to the observer.

Device for video display of the present invention both can be used for the liquid crystal cell of non-light-emitting component is used as the transmission-type or the reflection-type liquid-crystal display device of display element, can be used for using the display device of self light emitting display panel (organic EL plate etc.) again.

Recharge branch by the statement shown in hereinafter and understand further aim of the present invention, feature and advantage.Can understand interests of the present invention in the explanation with reference to the accompanying drawings below.

Description of drawings

Fig. 1 is the block diagram of composition that the device for video display of an embodiment of the present invention is shown.

Fig. 2 is the waveform that the pixel fluorescent lifetime response under the situation of any pixel of the device for video display of paying close attention to Fig. 1 is shown.

Fig. 3 is the figure of pixel luminescent waveform that the device for video display of an illustration 1 is shown.

Fig. 4 is the figure that the effect of the device for video display of qualitative key diagram 1 is used.

Fig. 5 is the figure that the effect of the device for video display of quantitative key diagram 1 is used.

Fig. 6 is the figure that concludes and illustrate the characteristic of each light-emitting mode among Fig. 5.

Fig. 7 is the figure that concludes and illustrate the characteristic of each light-emitting mode among Fig. 5.

Fig. 8 illustrates to make luminous strength ratio S be fixed as 70% or the figure of the relation of 90% o'clock duty factor D and hangover amount and flicker amount in the device for video display of Fig. 1.

Fig. 9 illustrates to make duty factor D be fixed as 10% or the figure of the relation of the luminous strength ratio S of 70% o'clock the 1st luminous component and hangover amount and flicker amount in the device for video display of Fig. 1.

Figure 10 illustrates to make luminous strength ratio S be fixed as the figure of the relation of 40% o'clock duty factor D and hangover amount and flicker amount in the device for video display of Fig. 1.

Figure 11 illustrates to make luminous strength ratio S be fixed as the figure of the relation of 60% o'clock duty factor D and hangover amount and flicker amount in the device for video display of Fig. 1.

Figure 12 illustrates to obtain hangover amount and the duty factor D of the effect that reduces simultaneously of flicker and the condition of luminous strength ratio S.

Figure 13 is the figure that the relation of hangover amount when making luminous strength ratio S=62% in the device for video display of Fig. 1 and flicker amount is shown.

Figure 14 is the figure that the relation of hangover amount when making luminous strength ratio S=48% in the device for video display of Fig. 1 and flicker amount is shown.

Figure 15 illustrates the scope in 48＜S%＜62 in the device for video display of Fig. 1 to obtain effect that hangover amount and flicker amount reduce the simultaneously figure with the upper limit of duty factor D.

Hangover and the improvement degree of the flicker figure that use of Figure 16 when to be explanation to the luminous strength ratio S of the B that satisfies condition and duty factor D extract 6 representative points.

Figure 17 is the figure that luminescent waveform available in the device for video display of an illustration 1 is shown.

Figure 18 is the figure that luminescent waveform available in the device for video display of another illustration 1 is shown.

Figure 19 is the figure that luminescent waveform available in the device for video display of another illustration 1 is shown.

Figure 20 is the figure that luminescent waveform available in the device for video display of another illustration 1 is shown.

Figure 21 is that the brightness level range of hangover that the hypothesis human eye response is shown can obtain the duty factor D of the effect that hangover amount and flicker improve simultaneously and the figure of luminous strength ratio S when being 10% to 90% (with reference to figure 5).

Figure 22 is under the situation of the brightness level range of hangover that the hypothesis human eye response is shown luminous strength ratio S=69 when being 10% to 90% (with reference to figure 5) and the figure of the relation of hangover amount under the situation of S=79% and flicker amount.

Figure 23 be the brightness level range of hangover that the hypothesis human eye response is shown when being 10% to 90% (with reference to figure 5) 69%＜S%＜79% with the figure of the upper limit of the duty factor D that obtains the effect that hangover amount and flicker amount improve simultaneously in the scope.

Figure 24 is the figure that reduces the usefulness of effect with the flicker of the device for video display of subjective assessment presentation of results Fig. 1.

Figure 25 is the cut-open view of the device for video display of another embodiment of the present invention.

Figure 26 is the figure of the relation of the modulation waveform of this pixel when the pixel of the device for video display of paying close attention to Figure 25 is shown and light source luminescent waveform.

Figure 27 is the figure that the effect of the device for video display of qualitative explanation Figure 25 is used.

(a) of Figure 28 is the figure that the transmission change when considering liquid crystal response is shown, and (b) is the figure that movement of objects illustrates the brightness variation that takes place on the direct of travel edge, (c) is the figure that movement of objects is illustrated the brightness variation that takes place on the rearward edges.

Figure 29 is the figure that illustrates the phase place of the 1st luminous component of liquid crystal response.

Figure 30 is the figure that the effect of the device for video display of the time constant of explanation duty factor D=30%, luminous strength ratio S=70% and liquid crystal Figure 25 when being 3.5 milliseconds is used.

Figure 31 is the figure of the phase place of the 1st luminous component of the time constant of explanation duty factor D=30%, luminous strength ratio S=70% and liquid crystal when being 3.5 milliseconds.

Figure 32 is the figure that the pixel periphery composition of the organic plates that is provided with in the device for video display of another embodiment of the present invention is shown.

Figure 33 is the related sequential chart of work with organic EL of pixel shown in Figure 32.

Figure 34 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 35 is the sequential chart of running usefulness of the device for video display of explanation Figure 34.

Figure 36 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 37 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 38 is the sequential chart of running usefulness of the device for video display of explanation Figure 37.

Figure 39 is the figure that the relation of lasting light and intermittent light and the 1st luminous component and the 2nd luminous component is shown.

Figure 40 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 41 is the sequential chart of running usefulness of the device for video display of explanation Figure 40.

Figure 42 is the figure that the composition example of carry over testing circuit is shown.

Figure 43 is the figure that schematically illumination light of display part of illumination Figure 40 is illustrated the luminous intensity of 1 vertical cycle share.

To be explanation control the figure of the process example of the illumination light that the display part to Figure 40 throws light on the carry over detection signal to Figure 44.

Figure 45 is the figure of explanation with the process of carry over detection signal control luminous strength ratio S2.

Figure 46 be explanation one reinstate shown in Figure 42 (b) APL information that the carry over testing circuit formed obtains and carry over amount control load than or the figure of the process of luminous strength ratio S2.

Figure 47 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 48 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 49 is the sequential chart of running of the LCD of expression Figure 48.

Figure 50 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 51 is the figure of composition that the device for video display of another embodiment of the present invention is shown.

Figure 52 is the sequential chart of running of the LCD of expression Figure 51.

Figure 53 is the figure that the luminescent waveform of the 2nd available among the present invention luminous component is shown.

The hangover amount reduced the figure that effect is used when Figure 54 was the luminescent waveform that illustrates shown in (a) part of using Figure 53.

Figure 55 be illustrate Figure 54 (a) part shown in luminescent waveform and the luminescent waveform of prior art divide fourier series result of calculation.

Figure 56 is the block diagram of composition that the device for video display of another embodiment of the present invention is shown.

Figure 57 is the sequential chart of running that the device for video display of Figure 56 is shown.

Figure 58 is the block diagram of composition that the device for video display of another embodiment of the present invention is shown.

Figure 59 is the sequential chart of running that the device for video display of another embodiment is shown.

Figure 60 is the sequential chart of running that the device for video display of another embodiment is shown.

Figure 61 is the figure of luminescent waveform that the device for video display of an embodiment of the present invention is shown.

Figure 62 is the block diagram of composition that the device for video display of an embodiment of the present invention is shown.

Figure 63 is the cut-open view of the device for video display of Figure 62.

Figure 64 is the sequential chart of running usefulness of the device for video display of explanation Figure 62.

Figure 65 is the figure that the device for video display of qualitative explanation Figure 62 improves the running usefulness of trailing and reducing to glimmer.

Figure 66 is the figure that illustrates that quantitatively the effect of the device for video display of Figure 62 is used.

Figure 67 is the figure that illustrates that quantitatively the effect of the device for video display of Figure 62 is used.

Figure 68 is the figure of effect that the device for video display of Figure 62 quantitatively is shown.

Figure 69 is the figure that concerns usefulness of duty factor D with the luminous phase place P at intermittence of the luminous component of explanation Figure 61 discontinuous.

Figure 70 is the figure that concerns usefulness of duty factor D with the luminous phase place P at intermittence of the luminous component of explanation Figure 61 discontinuous.

Figure 71 is the figure that concerns usefulness of duty factor D with the luminous phase place P at intermittence of the luminous component of explanation Figure 61 discontinuous.

Figure 72 figure that to be the duty factor D of explanation Figure 61 discontinuous luminous component use with the best relation of luminous phase place P intermittently.

Figure 73 is the figure that the luminescent waveform phase place of the device for video display of explanation Figure 62 is used.

Figure 74 is the figure with the effect of the device for video display of subjective assessment explanation Figure 62.

Figure 75 is the block diagram of composition that the device for video display of another embodiment of the present invention is shown.

Figure 76 is the sequential chart of running that the device for video display of Figure 75 is shown.

Figure 77 is the sequential chart of running that the device for video display of another embodiment of the present invention is shown.

Figure 78 is the figure that intermittence luminous component optimum phase use of responsive time constant when being 3.5 milliseconds of explanation liquid crystal.

Figure 79 is the figure that intermittence, luminous component optimum phase was used that illustrates when the liquid crystal time constant is 2.2 milliseconds.

Figure 80 is the block diagram of composition that the device for video display of another embodiment of the present invention is shown.

Figure 81 is the sequential chart of running that the EL pixel of Figure 80 is shown.

Figure 82 is the another figure that forms example that the EL pixel of Figure 80 is shown.

Figure 83 is the sequential chart of running that the pixel of Figure 82 is shown.

Figure 84 is the sequential chart of running that the device for video display of another embodiment of the present invention is shown.

Figure 85 illustrates luminous strength ratio S is fixed as 70% or the figure of the relation of 90% o'clock duty factor D and hangover amount and flicker amount.

Figure 86 illustrates duty factor D is fixed as 10% or the figure of the relation of the luminous strength ratio S of 70% o'clock the 1st luminous component and hangover amount and flicker amount.

Figure 87 illustrates the figure that luminous strength ratio S is fixed as the relation of 40% o'clock duty factor D and hangover amount and flicker amount.

Figure 88 illustrates the figure that luminous strength ratio S is fixed as the relation of 60% o'clock duty factor D and hangover amount and flicker amount.

Figure 89 illustrates among the present invention optimum load than the figure of the relation of D and luminous strength ratio S.

The figure of the hangover amount when Figure 90 is luminous strength ratio S=62% and the relation of flicker amount.

The figure of the hangover amount when Figure 91 is luminous strength ratio S=48% and the relation of flicker amount.

Figure 92 is result's the figure that the upper limit of the duty factor D that utilizes hangover model and scintillation analysis to calculate to obtain in 48＜S%＜62 scopes the effect that hangover amount and flicker amount reduce simultaneously is shown.

Figure 93 is hangover and the flicker improvement degree figure that use of explanation during from 6 representative points of extracted region of satisfy condition A and condition B.

Figure 94 is the figure that luminescent waveform available in the routine device for video display of the present invention is shown.

Figure 95 is the figure that luminescent waveform available in another routine device for video display of the present invention is shown.

Figure 96 is the figure that luminescent waveform available in another routine device for video display of the present invention is shown.

Figure 97 is the figure that luminescent waveform available in another routine device for video display of the present invention is shown.

Figure 98 is that hangover that the hypothesis human eye response is shown is that brightness obtains the duty factor D of the effect that hangover amount and flicker amount reduce simultaneously and the figure of luminous strength ratio S when changing 10% to 90% scope.

Figure 99 illustrates the figure that among condition A shown in Figure 98 and the condition B S is fixed as 69 or 79 hangover amounts that are and flicker amount.

Figure 100 is result's the figure that the upper limit of the duty factor D that utilizes hangover model and scintillation analysis to calculate to obtain in 69＜S%＜79 scopes the effect that hangover amount and flicker amount reduce simultaneously is shown.

Figure 101 is the block diagram of composition example that the device for video display of another embodiment of the present invention is shown.

Figure 102 is the block diagram of the composition example of lighting signal generating circuit that the LCD of Figure 101 is shown.

Figure 103 is the figure that the work wave of lighting signal generating circuit of Figure 102 is shown.

Figure 104 is the figure that the pulse signal waveform of the row that outputs to gate line g0～g7 among the LCD of Figure 101 and light signal p0～p3 is shown.

Figure 105 illustrates the lamp luminescent waveform among the LCD of Figure 101 and the figure of power waveform.

Figure 106 is the figure that the LCD of qualitative explanation Figure 101 improves the fuzzy usefulness of live image.

Figure 107 is the quantitative key diagram of the flicker that produces of the LCD of Figure 101.

Figure 108 is the figure that the lamp luminescent waveform in the device for video display that uses prior art is shown.

Figure 109 is the routine block diagram of another composition of lighting signal generating circuit that the LCD of Figure 101 is shown.

Figure 110 is the routine block diagram of another composition of lighting signal generating circuit that the LCD of Figure 101 is shown.

Figure 111 is the figure that the work wave of lighting signal generating circuit of Figure 110 is shown.

Figure 112 is the routine block diagram of another composition of lighting signal generating circuit that the LCD of Figure 101 is shown.

Figure 113 is the routine block diagram of another composition of lighting signal generating circuit that the LCD of Figure 101 is shown.

Figure 114 is that the explanation maintenance drives the figure that the generation principle of the hangover cause is used.

Figure 115 is the figure of the luminous improvement hangover of explanation impulse type usefulness.

Figure 116 is the figure that the problem of existing live image hangover improvement technology quantitatively is shown.

Figure 117 is the figure that the problem of existing live image hangover improvement technology quantitatively is shown.

Figure 118 is the figure at Figure 117 (a) shown in 1 figure and two figure of Figure 117 (b).

Embodiment

The present invention simultaneously carries out showing, improve live image hangover (movable fuzzy) based on the image of intermittent light, one side based on lasting light, suppress the flicker obstacle.Particularly, can form image, reduce to produce two kinds of picture quality obstacles with balance relation by utilizing the display light shown in the following embodiment.Below, embodiments of the present invention are described with reference to the accompanying drawings.

Embodiment 1

Fig. 1 is the figure of composition that the device for video display 1 of an embodiment of the present invention is shown.As shown in Figure 1, device for video display 1 comprises display board (video display unit) 2, video decoder 3, row driver 4, line driver 5, row electrode 6, column electrode 7 and input terminal 9.

From input terminal 9, import for example such vision signal of TSC-system vision signal.Video decoder 3 carries out the demodulation process corresponding with incoming video signal, and respectively to row driver 4 and line driver 5, output video data and synchronous timing signal.

4 pairs of a plurality of row electrode 6 supplying video data of row driver.Line driver 5 is selected a plurality of column electrodes 7 successively according to synchronous timing signal.For example, when paying close attention to a certain column electrode, if the synchronous timing signal cycle is 1/60 second, column electrode quantity is 525, and then the select time of column electrode is 32 microseconds (=1/60/525).

In the intersection point determined pixel 8 of row electrode 6 with column electrode 7.In the select time of column electrode 7,, the average luminescence brightness of pixel 8 is modulated, upgraded according to the video data of supplying with row electrode 6.On the other hand, according to the time beyond the time of video data modulation average luminescence brightness, the average luminescence brightness after pixel 8 keeps upgrading.Make running that this pixel 8 keeps the average luminescence brightness continuously to the selection phase of then selecting the column electrode corresponding with this pixel 8.

Vertical synchronizing signal with vision signal is that unit repeats above-mentioned a series of running.Then, finishing video by the set of the pixel of modulating, upgrading in these runnings shows.

Fig. 2 is the waveform that be shown the time response of the instantaneous light emission brightness under the situation of paying close attention to a certain pixel.T is the vertical cycle of vision signal, is unit with time.For example in the TSC-system, T equals 1/60 second.The pixel utilization of the device for video display of present embodiment comprise with respect to the period T fluorescent lifetime be D%, with respect to the pixel average luminescence brightness of 1 vertical cycle be the intensity of S% carry out the 1st luminous luminous component and with the time for (100-D) %, with respect to the pixel average luminescence brightness of 1 vertical cycle for (intensity of 100-S) % is carried out the 2nd luminous luminous component, forms to show video.

Here, be called peak luminous value, luminescence peak, instantaneous light emission brightness, instantaneous light emission intensity, instantaneous light emission peak or abbreviate brightness as the pixel of certain time is luminous.Strict, what be commonly referred to as brightness is instantaneous light emission brightness, and unit is nit (nit) or candela/metre2 (cd/m ²).Human eye perceives to be eyes carry out integration, brightness after level and smooth to instantaneous light emission brightness, be referred to as mean flow rate, average screen brightness, screen intensity, mean intensity, average level.Strict.Unit is not a nit, and nit unit is used in the most cases equivalence.For example LCD TV is in the products catalogue standard, uses the mean flow rate that shows when white.S shown in Figure 2 is called luminous strength ratio (or luminous intensity), luminous component, luminous quantity to what instantaneous light emission brightness and time ratio (or time) multiplied each other like that.Among Fig. 2, the area that surrounds with the longitudinal axis and transverse axis of luminescent waveform is equivalent to luminous intensity.

That is,, represent the 1st luminous component with the zone of band lower-left oblique line among Fig. 2.With the zone of band bottom right oblique line among Fig. 2, represent the 2nd luminous component.And the instantaneous light emission intensity of the 1st luminous component is greater than the instantaneous light emission intensity of the 2nd luminous component.

Observer with eye to averaging (integration) at the waveform shown in Fig. 2 like this, thereby be identified as the brightness of certain picture.With showing that the screen intensity when white defines the screen intensity of common device for video display.For example make the device for video display of TV (TV) purposes, then screen intensity is set at 250 nits (nit is a brill), screen intensity was configured to 500 nits when picture was lightened.

Fig. 3 (a) and Fig. 3 (b) are the figure that the pixel luminescent waveform of a routine present embodiment is shown.In these figure, the luminescent waveform of a vertical cycle is shown.Fig. 3 (a) is the figure that the luminescent waveform of certain pixel when setting screen intensity for 450 nits is shown.Setting the 1st luminous component for instantaneous light emission intensity is 900 nits, and duty factor is 30%; It is 260 nits that the 2nd luminous component is then set instantaneous light emission intensity for, and duty factor is 70%.

Therefore, the 1st luminous component is 900 * 0.3:260 * 0.7=6:4 with the ratio of the luminous intensity of the 2nd luminous component.

So the brightness of human eye perceives is the luminous intensity mean value of the 1st luminous component and the 2nd luminous component, thereby to obtain this brightness be 900 * 0.3+260 * 0.7=450 nit.With brightness is that the set of the pixel of 450 nits is taken as screen intensity, and then pixel intensity equates with screen intensity, and screen intensity also is 450 nits.

Fig. 3 (b) is the figure that the luminescent waveform of certain pixel when setting screen intensity for 200 nits is shown.Setting the 1st luminous component for instantaneous light emission intensity is 800 nits, and duty factor is 20%; It is 50 nits that the 2nd luminous component is then set instantaneous light emission intensity for, and duty factor is 80%.

Therefore, the 1st luminous component is 800 * 0.2:50 * 0.8=8:2 with the ratio of the luminous intensity of the 2nd luminous component.

Like this, the device for video display of present embodiment is characterized by: upgrade producing the image display light that comprises the 1st luminous component and the 2nd luminous component in the cycling element (vertical cycle) in pixel.So, according to this feature, can make to improve hangover and reduce flicker and be taken into account, hereinafter will illustrate.

Fig. 4 is the figure that the effect of the device for video display of qualitative explanation present embodiment is used.Particularly, these states that illustrate are: display board makes in black background and shows that longitudinal length is that 3 pixels, lateral length are the white object of random scale, and this object is with the past screen of the speed of every frame 1 pixel below constant speed movement.

(a) part of Fig. 4 is the figure that the time variation of the instantaneous light emission intensity when paying close attention to certain pixel is shown, and the longitudinal axis is represented the instantaneous light emission strength ratio, the transverse axis express time.In (a) part of Fig. 4, the luminous strength ratio corresponding with the 1st luminous component has nicking, and the luminous strength ratio corresponding with the 2nd luminous component has cross hatch.

Fig. 4 (b) part illustrates on the display board 2 objects displayed at the profile of moment second, the transverse axis remarked pixel, and the longitudinal axis is represented relative brightness.Relative brightness 0% means black, and 100% means white.(c) part of Fig. 4 illustrates the situation (transverse axis is the time, and the longitudinal axis is the space) of (b) movement of objects partly of Fig. 4.

The display frame of display board 2 is 2 dimensional planes originally, but Fig. 4 (c) part is omitted the transverse axis coordinate of the side in 2 solid axes that draw.Shown in Fig. 4 (c) part, objects displayed is along with the process of time moves, and moves relation with luminescent waveform of (a) part of Fig. 4 according to this, with the brightness of 2 kinds of intensity represented object.

That is, shown in Fig. 4 (a) part, the 1st luminous component luminous during instantaneous light emission intensity strong, thereby as (c) part of Fig. 4 in nicking partly shown in, instantaneous light emission intensity is also big.

Then, the observer during with the eye tracking object, because the accumulative total (integration) of these two kinds of luminances, this object is mirrored observer's nethike embrane with the state shown in (d) part of Fig. 4 along arrow No.1 2.(e) part of Fig. 4 illustrates the variation of the instantaneous brightness of object shown in (d) part.In (e) part of Fig. 4, the transverse axis representation space, the longitudinal axis is represented brightness ratio.

Shown in (e) part of Fig. 4, according to the device for video display 1 of present embodiment, the object brightness profile of observer's identification has 3 kinds of oblique lines, i.e. oblique line 1, oblique line 2 and the oblique line 3 of Fig. 4 (e) part.Here, importantly oblique line 1 and the oblique line 3 shown in Fig. 4 (e) part is mild, and oblique line 2 rises steeply, slope drastic change.

So human eye is difficult to discern the brightness corresponding with mild slope 1 and slope 3 to be changed.Its reason is that the observer is poor to this recognition capability that the contrast recognition capability of mobile object is generally compared the conventional stationary object.That is, for the low part of contrast in the object that is moving, human eye can not be discerned its contrast and change.Therefore, for live image, detail section that needn't image all accurately shows contrast.

So the luminance contour of the object of observer's identification only is an oblique line 2, the live image hangover the when pixel shown in (e) part of Figure 114 is carried out luminous (maintenance demonstration) with constant brightness can fully be finished and improve hangover.

Fig. 5 (a)～Fig. 5 (i) is the figure that illustrates that quantitatively the effect of the device for video display 1 of present embodiment is used, and is divided into the characteristic that 3 kinds of light-emitting modes illustrate brightness waveform time response, hangover amount and the flicker amount of pixel.

The characteristic of luminosity waveform, hangover amount and flicker amount when here, 5 (a)～Fig. 5 (c) illustrate working load than the existing impulse type light-emitting mode that is 25%.The characteristic of luminosity waveform, hangover amount and flicker amount when 5 (d)～Fig. 5 (f) illustrate working load than the impulse type light-emitting mode that is 40%.The characteristic of luminosity waveform, hangover amount and flicker amount when 5 (g)～Fig. 5 (i) illustrate the device for video display that uses present embodiment.The duty factor D of the 1st luminous component of the device for video display of present embodiment is set at 20%, then is set at 80% with respect to the strength ratio S of the 1st luminous component of total luminosity.

And Fig. 5 (a), Fig. 5 (d) and Fig. 5 (g) illustrate the luminosity waveform to each pattern.Fig. 5 (b), Fig. 5 (e) and Fig. 5 (h) are the hangover amounts when each pattern is used luminous processing of implementing improvement hangover usefulness with the hangover model of Fig. 4 explanation.

Hangover is changed to 85% o'clock space length to the waveform brightness ratio in space from 15% be defined as the hangover amount.Human eye to the low hypothesis of the sensitivity of the contrast of mobile object under, utilize subjective assessment experiment to remove this and be defined as 15% to 85% threshold value.Scope shown in the middle arrow of Fig. 5 (b), Fig. 5 (e) and Fig. 5 (h) is No.1 is equivalent to this hangover amount.

Fig. 5 (c), Fig. 5 (f) and Fig. 5 (i) illustrate the flicker amount to each pattern, though respectively brightness waveform time response shown in Fig. 5 (a), Fig. 5 (d) and Fig. 5 (g) is carried out frequency transformation with Fourier transform, the ratio of 0 DC component (mean value) and 1 order harmonic components is shown.When for example vertical synchronizing signal was 60 hertz a ntsc video signal, 1 subharmonic was 60 hertz.1 order harmonic components that is equivalent to 0 DC component is big more, and the flicker obstacle is big more.

Here, set for the time distribution integrated value (being mean flow rate) of Fig. 5 (a), Fig. 5 (d) and the luminosity shown in Fig. 5 (g) identical to each light-emitting mode.Owing to make mean flow rate identical like this, the energy of each mean value component (0 DC component) of Fig. 5 (c), Fig. 5 (f) and Fig. 5 (i) is identical in each light-emitting mode, can compare 1 order harmonic components to each light-emitting mode.

Fig. 6 concludes and illustrates the characteristic of each light-emitting mode of Fig. 5.Among Fig. 6, the duty factor D of the 1st luminous component of the 1st row represents the ratio to the time of lighting of the 1st luminous component of vertical cycle.The luminous strength ratio S of the 1st luminous component of the 2nd row is the 1st luminous component luminous intensity ratios to total luminous intensity.Here said " luminous intensity " is instantaneous light emission intensity to be made the value of time integral.

Shown in the luminescent waveform of Fig. 5 (a) and Fig. 5 (d), the light-emitting mode of prior art uses simple pulsed illumination component, replaces the device for video display of present embodiment, and the strength ratio S that we can say the 1st luminous component is 100%.As indicated above, it is luminous to utilize the 1st luminous component and the 2nd luminous component to carry out, and this is the feature of the device for video display of present embodiment.

Hangover amount shown in the 3rd row of Fig. 6 is the length of the No.1 line of arrow shown in Fig. 5 (b), Fig. 5 (e) and Fig. 5 (h), i.e. hangover space length of calculating according to the model that defines among Fig. 4.Flicker amount shown in the 4th row of Fig. 6 is meant the ratio of 60 hertz of components (1 subharmonic) to mean value (0 DC component).The 1st row～the 3 row of Fig. 6 is equivalent to the light-emitting mode 1～3 of Fig. 5 respectively.

As with Figure 114 explanation, not have under the luminous situation of hangover countermeasure, hangover amount (is the hangover length of unit with the pixel) is 0.7.On the other hand, the duty factor of the existing example shown in the 1st row of Fig. 6 is 25%, and the hangover amount is improved to 0.18.That is, compare during with nothing hangover countermeasure, reduce 75% hangover amount.Yet the existing example shown in the 1st row of Fig. 6 is 60 hertz of higher harmonic components of main cause with 90% ratio generation flicker.

In the existing example of the 2nd row, duty factor is increased to 40%, to reduce the flicker amount.Thereby 60 hertz of components that glimmer for main cause are reduced to 75%, but the hangover amount is increased to 0.28.That is, the impulse type of existing example of the 2nd row is luminous to be compared when not having the hangover countermeasure, and the hangover amount can only reduce 60%.

In contrast, the 3rd row illustrates that duty factor D with the 1st luminous component is taken as 20%, luminous strength ratio S is taken as hangover amount and flicker amount at 80% o'clock.

Distinguish from Fig. 6,, compare, can make the flicker amount decay to 70% from 90%, and the hangover amount is 0.18, be improved to and the identical degree of existing example of the 1st row with the existing example of the 1st row according to the device for video display of present embodiment.Like this, present embodiment can substantially improve hangover again, can reduce the obstacle that glimmers significantly again, and the video of best in quality can be provided observer.

Fig. 7 illustrates the characteristic of each light-emitting mode of Fig. 5, and transverse axis is the hangover amount, the picture quality height that numerical value is little.The longitudinal axis is the flicker amount, and the flicker that numerical value is little is little, the picture quality height.The image of prior art shows to utilize and changes duty factor D, makes on the track of value in Fig. 7 of flicker amount and hangover amount to move, and the ideal shown in No.1 is not improved direction and moved toward blank arrow.That is, flicker amount and hangover amount are the balance relation, and both can not improve simultaneously.Yet the characteristics of luminescence of the device for video display of the present embodiment shown in the circular horn among Fig. 7 distinguishes that compared with the prior art, hangover amount and flicker amount all improve.

Fig. 8 (a)～Fig. 8 (c) illustrates in the device for video display of present embodiment, and luminous strength ratio S is fixed as 70% or 90% o'clock the duty factor D and the relation of hangover amount and flicker amount.When duty factor D equaled luminous strength ratio S, luminescent waveform became direct current, thereby Fig. 8 (a)～Fig. 8 (c) is with its eliminating.Duty factor D〉during luminous strength ratio S, the instantaneous light emission intensity of the 1st luminous component is less than the instantaneous light emission intensity of the 2nd luminous component, the scope of the effect of the non-explanation present embodiment of this situation, thereby also get rid of.

Shown in Fig. 8 (a)～Fig. 8 (c), duty factor D＜luminous strength ratio S and luminous strength ratio is fixed as 70% or 90%, during simultaneously also with hangover amount shown in the model of the duty factor D calculating chart 4 obtained and flicker amount shown in Figure 5, its characteristic is turned left down from the characteristic of prior art to whole duty factor D and is moved (with reference to figure 8 (a)), distinguishes that the device for video display of present embodiment reduces hangover amount and flicker amount simultaneously.

Fig. 9 (a)～Fig. 9 (c) illustrates in the device for video display of present embodiment and duty factor D to be fixed as 10% or the luminous strength ratio S of 70% o'clock the 1st luminous component and the relation of hangover amount and flicker amount.From Fig. 9 (a)～Fig. 9 (c) obviously as can be known, duty factor D＜luminous strength ratio S and duty factor D being fixed as under 10% or 70% the situation, certain luminous strength ratio (being 70% here) to less than hangover amount shown in the model of 100% luminous strength ratio S calculating chart 4 and flicker amount shown in Figure 5 the time, is distinguished that the device for video display of present embodiment makes hangover amount and flicker amount reduce (with reference to figure 9 (a)) simultaneously.

Among Fig. 9 (b) and Fig. 9 (c), S gets 70% with luminous strength ratio, and its reason is, in specific luminous strength ratio S and the combination of duty factor D, does not improve the effect of hangover amount and flicker amount sometimes simultaneously.Just because of the combination according to luminous strength ratio S and duty factor D in the oblique line 1,2,3 shown in (e) part of Fig. 4, the slope of oblique line 1,3 is big, and the hangover quantitative change is big.Therefore, the situation of getting rid of luminous strength ratio S=40% in the present embodiment.

Figure 10 (a)～Figure 10 (b) illustrates in the device for video display of present embodiment luminous strength ratio S is fixed as 40% o'clock the duty factor D and the relation of hangover amount and flicker amount.Shown in Figure 10 (a), distinguish that hangover amount and flicker amount can not get reducing simultaneously under this condition.

Figure 11 (a) and Figure 11 (b) illustrate luminous strength ratio S and are fixed in 60% o'clock the duty factor D and the relation of hangover amount and flicker amount, under this condition, according to duty factor D, have effective situation and invalid situation.

Conclude the characteristic of Fig. 8 to Figure 11, the condition that then can obtain the duty factor D of effect of device for video display of present embodiment and luminous strength ratio S as shown in figure 12.In the figure of Figure 12, my duty factor D of transverse axis, the longitudinal axis is luminous strength ratio S.Can obtain the duty factor D of effect of device for video display of present embodiment and luminous strength ratio S and satisfy 62%≤S%＜100% and 0%＜D%＜100% and D%＜S%, or satisfy 48%＜S%＜62% and D≤(S-48)/0.23 as condition B as condition A.Among Figure 12, the zone of the A that satisfies condition has mesh point, the regional corresponding oblique line of the B that satisfies condition.

S is set at 100%, means the intermittence of using prior art luminous (impulse type demonstration), thereby be not included among condition A and the condition B.Be set at S=D, mean the instantaneous light emission intensity of luminous component and the equal situation of instantaneous light emission intensity of the 2nd luminous component, thereby be not included among condition A and the condition B.Be set at S=0% or D=0%, mean not produce the 1st luminous component, thereby be not included among condition A and the condition B.Be set at D=100%, mean not produce the 2nd luminous component, thereby be not included among condition A and the condition B.

For the luminous strength ratio S of the A that satisfies condition, illustrated as Fig. 8 (a)～Fig. 8 (c), can both be reduced the effect of hangover amount and flicker amount simultaneously to whole duty factor d that can get.The scope that condition A and condition B do not comprise is then illustrated as Figure 10 (a), does not reduce the effect of hangover amount and flicker amount simultaneously.

Illustrated as Figure 11 (a) and Figure 11 (b), the scope of the luminous strength ratio S shown in the condition B only can obtain the effect that reduces hangover amount and flicker amount simultaneously when certain duty factor.

Hangover amount when Figure 13 (a) and Figure 13 (b) illustrate luminous strength ratio S=62% and the relation of flicker amount.At this moment, shown in Figure 13 (b), distinguish that the duty factor D that can get is had the effect that reduces hangover amount and flicker amount simultaneously.

Hangover amount when Figure 14 (a) and Figure 14 (b) illustrate luminous strength ratio S=48% and the relation of flicker amount.At this moment, shown in Figure 14 (a) and Figure 14 (b), do not exist and obtain the duty factor D that reduces hangover amount and flicker amount simultaneously.Like this, distinguish that from Figure 11, Figure 13 and Figure 14 the luminous strength ratio S of the B that satisfies condition is: 48＜S%＜62.

Figure 15 (b) utilizes hangover model and scintillation analysis to calculate the upper limit that obtains the duty factor D of the effect that reduces hangover amount and flicker amount simultaneously in the scope of 48＜S%＜62.That is, duty factor D and the luminous strength ratio S that calculates according to the hangover model is the value shown in Figure 15 (b).In the figure shown in Figure 15 (a) as this figure in ◆ mark this value shown in number like that.This ◆ the characteristic shown in number can roughly be similar to the straight line of S=0.23D+48.If the duty factor D that duty factor is represented less than this near linear then obtains the effect that reduces hangover amount and flicker amount simultaneously, thereby D≤(S-48)/0.23 is set at condition B.

Hangover amount and the improvement degree of the flicker figure that use of Figure 16 (a)～16 (c) when to be explanation to the luminous strength ratio S of satisfy condition A or condition B and duty factor D extract 6 representative points.That is, among Figure 16 (a), extract P1～P6, as the point of satisfy condition A and condition B.Figure 16 (b) illustrates the value of the D and the S of each point.Figure 16 (c) obtains hangover amount and flicker amount according to model shown in Figure 4, and is drawn as the figure of hangover amount-flicker discharge curve.Shown in Figure 16 (c), the hangover amount of P1～P6 and the value of flicker amount are lighted (impulse type demonstration) line from the intermittence of prior art and are moved toward the lower left.Therefore, set D and S for satisfy condition A or condition B, then can improve hangover and these two quality obstacles that glimmer simultaneously.

A or condition B as long as the relation of the duty factor D of the 1st luminous component and the 2nd luminous component and luminous strength ratio S satisfies condition, any waveform of its luminescent waveform all can, be not less than the waveform shown in Fig. 3 (a) and Fig. 3 (b).

Figure 17 (a) and Figure 17 (b) illustrate a routine this luminescent waveform.The transverse axis of Figure 17 (a) and Figure 17 (b) is the time, and the longitudinal axis is an instantaneous light emission intensity, and the luminescent waveform of 1 vertical cycle share is shown.The situation that Figure 17 (a) illustrates is because the dimming function (user is switched the function of the brightness of whole image) of device for video display and the control mode of device for video display, the sawtooth wave of superpose about 2.4 kilo hertzs (per 16.7 milliseconds are vibrated 40 times).Because human eye can not be followed the tracks of the frequency of 2.4 kilo hertzs of repetitions, though this luminescent waveform also with the luminescent waveform equivalence shown in Figure 17 (b), obtain the effect of present embodiment, promptly improve hangover and flicker simultaneously.

Among Fig. 2, Fig. 3 etc.,, the waveform of the 1st luminous component and the 2nd luminous component is described with square wave for pixel fluorescent lifetime response wave shape illustrative ease to present embodiment.Yet, the invention is not restricted to this square wave.Illustrated as Fig. 4, exist in the direction that departs from the original integration direction of human eye luminous problem of carrying out integration in the maintenance display device to pixel.For the eye tracking mobiles, produce integration route departing from toward this integration direction.Existing impulse type display device is divided luminous by suppressing portion, reduce the obstacle that trails, but present embodiment reduces the hangover amount again, improves the flicker amount again simultaneously.The luminescent waveform of present embodiment is by concentrating the luminous intensity (" luminous energy ") of luminous strength ratio S to form at duty factor D official hour.Therefore, much less, even non-its effect of pure square wave does not reduce yet.

Figure 18 (a) and Figure 18 (b) illustrate another the routine luminescent waveform that can obtain the effect of improving hangover and flicker simultaneously.Shown in Figure 18 (a) and Figure 18 (b), the 2nd luminous component can be made up of burst pulse.Among Figure 18 (a) and Figure 18 (b), transverse axis express time, the longitudinal axis are represented instantaneous light emission intensity, and the luminescent waveform of 1 vertical cycle share is shown.

When using the luminescent waveform shown in Figure 18 (a) and Figure 18 (b), identical with the luminescent waveform shown in Figure 17 (a), human eye is not followed the tracks of the frequency of the 2nd luminous component, thereby the luminescent waveform of the 2nd luminous component and the luminescent waveform equivalence shown in the dotted line, can realize taking into account the improvement of hangover and flicker.(during 100-S) %, shown in Figure 18 (a), adjustable whole pulse is lighted time T 0, also can change pulse strength L0 as Figure 18 (b) to adjust the luminous strength ratio of the 2nd luminous component.

The repetition frequency of the 2nd luminous component can be selected the value that human eye is not followed the tracks of.For example can be such several kilo hertzs of the sawtooth wave of Figure 17 (a), also can be several times of video vertical frequencys about 150 hertz.According to the characteristic and the view environment of the demonstration video of device for video display, sometimes 80 hertz frequency also can, also can for 100 hertz sometimes.For example screen intensity is in the device for video display of 250 nits, even the frequency about 120 hertz (being 2 times frequency of ntsc video signal), human eye also is identified as continuous light sometimes.For example screen intensity is in the device for video display of 500 nits, and 120 hertz are felt to glimmer sometimes, and the frequency that must be not less than 300 hertz sometimes just is identified as continuous light.The video that device for video display shows is under the many situations of rest image, and screen intensity changes slightly and will regard obstacle as sometimes, and under the many situation of live image, does not mind picture change to a certain degree sometimes.In a word, can suitably select the frequency that exists in system's composition of device for video display.

Another example that illustrates Figure 19 can obtain the luminescent waveform that improves hangover and flicker simultaneously.As shown in figure 19, the luminescent waveform of the 1st luminous component and the 2nd luminous component can be triangular wave.Among Figure 19, transverse axis is the time, and the longitudinal axis is an instantaneous light emission intensity, and the luminescent waveform of above-mentioned 1 vertical cycle share.Under the situation of this luminescent waveform, be used as and the luminescence response equivalence shown in the dotted line.Promptly, when triangle luminescent waveform shown in Figure 19 is applied to model shown in Figure 4, though oblique line 1,3 of Fig. 4 (e) part is not a straight line and present curve, but the oblique line 2 that docks with oblique line 1 and oblique line 2 is by the duty factor D and the luminous strength ratio S decision of the 1st luminous component and the 2nd luminous component, thereby the value that makes D and S satisfies flicker condition A or condition B, then can improve hangover and these two quality obstacles that glimmer simultaneously.

Figure 20 is that the luminescent waveform of the 1st luminous component and the 2nd luminous component is the situation of exponential function, but this luminescent waveform is identical with Figure 19, also with the characteristics of luminescence equivalence shown in the dotted line, can obtain the effect of present embodiment.

Explanation as Fig. 2, be illustrated as the instantaneous light emission intensity of the instantaneous light emission intensity of the 1st luminous component greater than the 2nd luminous component, but this and do not mean that Figure 18 (a) or the instantaneous light emission intensity of the 2nd luminous component of Figure 18 (b) is no more than the instantaneous light emission intensity of the 1st luminous component.Among Figure 18 (a) and Figure 18 (b), consider that the human eye characteristic becomes this dotted line of dotted line to mean instantaneous light emission intensity less than the 1st luminous component the 2nd luminous component equivalent replacement.

In the above description, the definition with the hangover amount is taken as 15% to 85% brightness variation range.Here, when for example the screen intensity of device for video display being set at the brightness value of 600 nits and view environment when dark, under the condition of bigger duty factor D of the slope ratio of the oblique line 1,3 of Fig. 4 (e) part explanation and luminous strength ratio S, sometimes visible this oblique line 1,3 of observer makes hangover improve effect and reduces.In this case, can set the luminescence response waveform in the scope of the condition that satisfies duty factor D shown in Figure 21, luminous strength ratio S.

Optimum load is than D and luminous strength ratio S in the present embodiment when brightness level range of hangover that Figure 21 illustrates the hypothesis human eye response is 10% to 90% (with reference to figure 5).

At this moment, D and S satisfy 79%≤S%＜100% and 0%＜D%＜100% and the D%＜S% as condition A1, or satisfy 69%＜S%＜79% and D≤(S-69)/0.127 as condition B1.Among Figure 21, the part of representing with mesh point is condition A1, and the part of representing with oblique line is condition B1.

Hangover amount when Figure 22 (a)～when Figure 22 (c) illustrates luminous strength ratio S=69% and S=79% and the relation of flicker amount.Identical during with the condition of setting D shown in Figure 21 and S, the brightness level range of supposing the hangover of human eye response is 10% to 90%.

At this moment, shown in Figure 22 (a), the duty factor D that can get when distinguishing S=79% has the effect that reduces hangover amount and flicker amount simultaneously.As shown in the drawing, there is not the duty factor D that obtains the effect that reduces hangover amount and flicker amount simultaneously during S=69%.Like this, distinguish that from Figure 22 (a) the luminous strength ratio S of the B1 that satisfies condition is 69%＜S%＜79%.

Figure 23 (a) and Figure 23 (b) utilize hangover model and scintillation analysis to calculate the hangover brightness level range of human eye response are assumed to be the upper limit that obtains the duty factor D of the effect that reduces hangover amount and flicker amount simultaneously in 69%＜S%＜79% scope of 10% to 90% o'clock.

That is, duty factor D and the luminous strength ratio S that calculates according to the hangover model is the value shown in Figure 23 (b).In the figure shown in Figure 23 (a) as this figure in ◆ mark this value of picture shown in number like that.This ◆ the characteristic shown in number can roughly be similar to the straight line of S=0.127D+69.If the duty factor that duty factor is represented less than this near linear then obtains the effect that reduces hangover amount and flicker amount simultaneously, thereby D≤(S-69)/0.127 is set at condition B1.

Figure 24 is that the flicker according to the device for video display of subjective assessment presentation of results present embodiment reduces the figure that effect is used.About the screen intensity of device for video display, white brightness (screen intensity when demonstration is white on the screen) is set at 450 nits.450 nits are fully bright degree to TV (TV) receiver, and nit (nit) is the unit of brightness.(Average Picture Level: 3 kinds of average level) different figure A, B, C are with the characteristic that judges with APL.These images are rest images.

Particularly, image A is a dark generally image such as night scene for example, and its APL is 20%, and average screen brightness is 100 nits.Image B is that APL is 50% the image of mainly being made up of middle gray, and its average screen brightness is 250 nits.Image C is a bright image such as blue sky for example, and its APL is 80%.Average screen brightness is 350 nits.

Show these image A, B, C at device for video display, be used as Fig. 5 (a) of the luminescent waveform in the prior art and switch and drive as the Fig. 5 (g) of the luminescent waveform in the present embodiment, thereby whether experiment can perceive image flicker, whether feels in the time of perceiveing that image flicker hinders to watch.The yardstick of subjective assessment is 5 grades.Yardstick is big more, and picture quality is high more.

As shown in figure 24, the subjective assessment about the device for video display of present embodiment generally speaking, obtains the evaluation higher than prior art.In the prior art, along with the brightness distinctness, the flicker obstacle is remarkable.Yet, distinguish that the effect that the device for video display of present embodiment reduces to glimmer reaches the level that the observer can allow.This effect that reduces to glimmer is all found equally to 3 kinds of APL (i.e. 3 kinds of brightness).

And as indicated above, the device for video display of present embodiment utilizes human eye low to the sensitivity of the contrast of mobile object, improves hangover.Therefore, though certain in a flash human eye see the screen intensity that the 2nd luminous component brings, this brightness does not influence yet and improves the hangover performance.

In sum, in the present embodiment, the luminescence response waveform that utilizes the 1st luminous component and the 2nd luminous component to form suppresses the hangover of mobiles again, and the profile of clear display suppresses flicker simultaneously again, thereby can realize that high-quality image shows.And, in improving the live image hangover, utilize the human eye characteristic low to the sensitivity of the contrast of live image.

The screen intensity of device for video display improves, and then perceives flicker (Ferry-Porter rule) easily.Therefore, in the existing intermittence lighting mode, during with the high brightness display image, be easy to generate the flicker obstacle.The body of rod of the cellula visualis of human eye than cone to the light on and off sensitivity, promptly the periphery of visual field than the center to the light on and off sensitivity, so that the display board of device for video display when maximizing, identification flicker obstacle easily.Therefore, to be used to improve the picture quality of device for video display of high brightnessization and giant-screenization especially effective for the device for video display of present embodiment.

The condition of duty factor D illustrated in fig. 12 and luminous strength ratio S is replaced as hangover amount and flicker amount and obtains after simple model calculates.The picture quality of device for video display depends on that the degree of observer's subjectivity is big, and arranged by view environment, so be difficult to quantize, but inventor etc. confirm that condition and the evaluation result difference of utilizing model to obtain are little in the subjective assessment experiment (with reference to Figure 24) based on the condition of obtaining.

The condition of duty factor D illustrated in fig. 12 and luminous strength ratio S is replaced as hangover amount and flicker amount and obtains after simple model reduces to calculate, as the condition of this simple model, and the hangover amount when supposing white movement of objects and show flicker amount when white.On the other hand, there is 100% white signal hardly in the video of rating usually.Therefore, device for video display for screen intensity 500 nits, the average level of the video of actual displayed is 50%, then for example is 250 nits (=500/2) with the screen intensity equivalent replacement of device for video display and obtains optimum load than the method for the value of D and luminous strength ratio S etc. effectively.

At this moment, can determine the value of D, S according to the histogram information such as (video data distributions) of the video that shows.Perhaps also can constitute from incoming video signal and detect video characteristic quantities such as the histogram of brightness and average level automatically, and the characteristics of luminescence of automatic switchover pixel.

60 hertz of components that are used as 1 subharmonic are judged the flicker amount.In fact produce the higher hamonic wave of 60 hertz integral multiple, but inventors etc. utilize experimental verification only to pay close attention to 60 hertz of components and it is suppressed to get final product.For example because giant-screenization and high brightnessization, may produce the situation that 120 hertz higher hamonic wave also is identified as obstacle, but at this moment, illustrated as present embodiment, can make Fourier transform to luminescent waveform, one side is paid close attention to 60 hertz and 120 hertz of these two components, and one side is obtained duty factor D and luminous strength ratio S.

Present embodiment is used as vision signal as the TSC-system signal and is illustrated, but present embodiment also is fit to the situation of the vision signal of demonstration personal computer.For example the vertical frequency of device for video display is under the situations such as 75 hertz, and human eye sensitivity is low during than 60 hertz, corresponding the reducing of flicker amount of observer's sensation, but according to conditions such as screen intensitys, still observing flicker sometimes becomes obstacle.At this moment, can pay close attention to 75 hertz of components, and as present embodiment, obtain the condition of duty factor D and luminous strength ratio S.

The situation of 15%, 85% the threshold value definition hangover that present embodiment changes with brightness the relation of duty factor D, luminous strength ratio S has been described with Figure 12.With Figure 21 situation with the definition of 10%, 90% threshold value has been described again.Yet, the absolute value of unique absolutely not definite threshold value.This is because the picture quality of device for video display is subjected to the subjective domination of observer.And view environments such as illumination on every side, viewing distance also change.The image that shows is that rest image or live image aspect also change.In a word, can in the multiple application of device for video display, determine optimum value at every turn, and carry out qualitative, quantitative evaluation, carry out work by final subjective assessment with the method for present embodiment explanation.

Also can detect the average level of display image, and dynamically or the parameters such as luminous phase place of adaptive control duty factor D, luminous strength ratio S, the 1st luminous component.Can carry out these parameter control according to the histogram of image.Also can use action messages such as interframe difference.Also can obtain illuminance information and control from the illuminance transducer of measuring the illumination around the device for video display.Also can use their time fluctuation information.Brightness maximal value, the minimum value that also can use the video of demonstration to comprise.Also the activity of image can be gone out as vector detection, and control according to this information.Also can link, and control by each different parameter with the function of observer toggle screen brightness.Also can detect total power consumption of device for video display, and parameter is controlled, to reduce power consumption.Also can detect the continuous operation time after the energized, and reduce the such parameter control of screen intensity when lighting for a long time.

According to the 1st luminous component and these two kinds of luminous components of the 2nd luminous component the pixel luminescent waveform of present embodiment has been described, but has been not specifically limited to two kinds.According to the modulating part of pixel, control respectively by defining the 3rd luminous component separately sometimes, can obtain optkmal characteristics.Can define the 4th luminous component, the 5th luminous component sometimes.

At this moment, in the model of Fig. 4 explanation, be divided into a plurality of luminescent waveforms in the setting of Fig. 4 (a) part, set the video information that shows in Fig. 4 (b) part, calculate the brightness change information of (c) vertical direction partly of Fig. 4, and carry out integral operation toward the direction of arrow No.1 2, then obtain suitable hangover brightness and change waveform.Under 3 kinds or the more luminous situation, with the model of present embodiment, also can analyze, and can derive best operating condition according to this analysis result.

Have the time and go up the limited response time if implement the luminous element of pixel, can Fig. 4 (a) part or (b) part add this of information time response.Can analyze it according to the item that illustrates in the above-mentioned present embodiment, thereby can derive best operating condition.

Moreover, in the present embodiment, use the ratio definition flicker amount of direct current with 1 subharmonic of Fourier transform results.Here, can import absolute value, and each absolute value carries out the weighting of higher hamonic wave ratio.This absolute value is equivalent to for example average screen brightness of device for video display.The screen intensity distinctness then changes according to mean flow rate, makes to allow flicker quantitative change little (becoming the condition strictness) etc.Therefore, likening to the function of screen intensity of direct current and 1 subharmonic handled, the precision of then flicker amount further improves.Mode in also available company 2 subharmonic are also contained in defines the flicker amount.

Embodiment 2

The device for video display of another embodiment of the present invention is described with Figure 25 to Figure 31.Figure 25 is the cut-open view of the device for video display of present embodiment.As shown in figure 25, Ah's device for video display 10 of present embodiment comprises light source (light source body) 11, display board (video display unit) 12, diffuser plate 13 and optical gate 14.Determined pixel on display board 12 (not shown).

The device for video display 10 of above-mentioned composition to, between diffuser plate 13 and optical gate 14, form the space, and light source 11 be configured in the below in this space.This light source 11 is toward the lower surface outgoing illumination light of diffuser plate 13.

Display board 12 is transmissive liquid crystal panel for example, after modulating by the illumination light of diffuser plate 13, makes its projection.Do the modulation of illumination light according to video signal displayed, its vertical synchronizing signal according to vision signal is repeated.This display board 12 shines the light of 12 pairs of light sources 11 of only display board of upper surface and makes the light that the modulation back forms, and the observer is identified as the demonstration video with the set of the light of each pixel modulation.

Figure 26 illustrates the modulation waveform (time of pixel modulation rate changes) of this pixel when paying close attention to certain pixel and the relation of the luminescent waveform of light source 11.That is, the vertical timing signal shown in Figure 26 (a) part writes as data during for " height ", and as Figure 26 (b) part shown in, the pixel according to demonstration makes the pixel modulation rate be transformed into D0, D1, D2 respectively.For example in the TSC-system vision signal, every T=repeated this pixel modulation running in about 1/60 second.

Here, thus the response time properties of supposing pixel is an ideal behavior finishes the situation of response in the write time.Vertical timing signal is the time of selecting other pixel during for " low ", and the pixel of concern keeps the data that write.

Then, light source 11 repeats at least 2 kinds of ignition mode according to vertical timing signal.That is, send out when it's convenient shown in the nicking in Figure 26 (c) part for have duty factor D%, to the 1st luminous component of the luminous intensity of the S% of total luminous intensity.Part shown in the cross hatch for have duty factor (100-D) %, to (the 1st luminous component of the luminous intensity of 100-S) % of total luminous intensity.

Present embodiment utilizes the luminescent waveform shown in Figure 26's (c) part to improve with the liquid crystal indicator to be the hangover (image blurring) that produces on the principle in the maintenance display device of representative, and the flicker obstacle that takes place as disadvantage when improving hangover is reduced simultaneously.

Reason with Figure 27 explanation can the improvement simultaneously hangover and flicker obstacle.Figure 27 is the model identical with Fig. 4, illustrate to show in the black background that longitudinal length is that 3 pixels, lateral length are the white object of random scale, and this object is with the state of the past screen of the speed of every frame 1 pixel below constant speed movement.

Figure 27 (a) part is that the figure that time of the luminescent waveform of light source 11 changes is shown, and the longitudinal axis is represented the instantaneous light emission strength ratio, the transverse axis express time.In (a) part of Figure 27, the luminous strength ratio corresponding with the 1st luminous component has nicking, and the luminous strength ratio corresponding with the 2nd luminous component has cross hatch.

(b) part of Figure 27 illustrates the roomage response of the pixel transmission rate when paying close attention to certain pixel, the transverse axis remarked pixel, and the longitudinal axis is represented transmissivity.(c) part of Figure 27 illustrates the situation (transverse axis is the time, and the longitudinal axis is the space) of (b) movement of objects partly of Figure 27.

The display frame of display board 12 is 2 dimensional planes, but Figure 27 (c) part is omitted the horizontal axis of the side in 2 solid axes that draw.The light that comes out from pixel is the product of the luminous and transmissivity of light source.That is, shown in Figure 27 (c) part, objects displayed is along with the process of time moves, and moves relation with luminescent waveform of (a) part of Figure 27 according to this, with the brightness of 2 kinds of intensity represented object.

That is, shown in Figure 27 (a) part, the 1st luminous component light during luminous intensity strong, thereby as (c) part of Figure 27 in nicking partly shown in, instantaneous light emission intensity is also big.

Present embodiment is shown in (e) part of Figure 27, and according to the device for video display 10 of present embodiment, the object brightness profile of observer's identification has 3 kinds of oblique lines, i.e. oblique line 1, oblique line 2 and the oblique line 3 of Figure 27 (e) part.Here, importantly oblique line 1 and the oblique line 3 shown in Figure 27 (e) part is mild, but oblique line 2 rises steeply slope drastic change.

Human eye is difficult to discern the brightness corresponding with mild oblique line 1 and oblique line 3 to be changed.Its reason is that the observer is poor to this recognition capability that the contrast recognition capability of mobile object is generally compared the conventional stationary object.That is, for the low part of contrast in the object that is moving, human eye can not be discerned its contrast and change.Therefore, for live image, detail section that needn't image all accurately shows contrast.

So the luminance contour of the object of observer identification only be an oblique line 2, for shown in (a) part of Figure 114 carry out luminous light source illumination display board with constant brightness the time the live image hangover, can fully finish to improve and trail.

Here, consider to add in the hangover model parameter of the time constant of liquid crystal response characteristic.Liquid crystal responds with the time constant of Millisecond usually, can not transient change.This liquid crystal time constant of hypothesis is to calculate in 0 second among Figure 27.

Here, the response of liquid crystal is taken as is similar to exponential function, be taken as=A0* (1-exp (t/ τ)), wherein y is a transmissivity, and A0 is an arbitrary constant.τ is a time constant, is from beginning to respond to 63% the time that responds end value.90% the time that reaches the object penetrating rate is 2.3 times of time constant.Here, suppose that time constant is the liquid crystal about 2 milliseconds to 5 milliseconds.The life period constant is the liquid crystal of 10 milliseconds or longer low-response in this world, but here with its eliminating.The present embodiment purpose is to improve hangover.As the prerequisite of improving hangover, must take into account the both sides that improve of the improvement of maintenance display characteristic and liquid crystal response time.It is luminous that the liquid crystal of low-response is improved maintenance, thereby when the radiation pulses type is luminous, obstacles such as edge astigmatism take place.Therefore, the hypothesis upper limit of the time constant of liquid crystal is taken as 5 milliseconds here.

For example consider the situation (reach 90% time be 5 milliseconds) of timeconstant=2.2 millisecond, then length is that state that the object of 3 pixels the moves transmission change when paying close attention to certain pixel down is shown in Figure 28 (a).

The brightness of (c) part of Figure 27 changes the value that is equivalent to the axle of the vertical direction of drawing is gone up expression.The product that the calculating that the brightness of space-time the is changed calculating of the instantaneous light emission intensity of pixel transmission (that is, from) be the pixel transmission rate shown in (b) part of instantaneous light emission strength ratio, Figure 27 of the light source shown in (a) part of Figure 27, respond with the picture point time shown in Figure 28 (a).

After comprising the computing of response characteristic of Figure 28 (a) like this, when carrying out the integral operation toward the direction of the arrow No.1 2 shown in (c) part of Figure 27, change shown in Figure 28 (b) and Figure 28 (c) with respect to the hangover brightness in space.Figure 28 (b) illustrates the brightness variation that movement of objects direct of travel edge produces.Figure 28 (c) illustrates the brightness variation that the movement of objects rearward edges produces.

Here, in the luminescent waveform of the light source 11 shown in Figure 27 (a) part, form duty factor D=30%, luminous strength ratio S=70%.Figure 28 (b) and Figure 28 (c) are compared with (e) part of Figure 27, consider that obviously oblique line 1,3 parts are not straight lines in the hangover computing of time constant of liquid crystal.

Yet with respect to oblique line 2, the slope of this part is mild, thereby does not reduce the effect of embodiment of the present invention 1 explanation, does not promptly reduce to improve simultaneously the effect of hangover and flicker.Particularly, the hangover amount among Figure 28 (b) and Figure 28 (c) is 0.32, and the flicker amount does not have 0.49.If, then distinguish and to measure both to existing intermittence luminous improvement hangover amount and flicker in Figure 118 this value of picture of getting the bid.

Here, with respect to the phase place of the 1st luminous component of the response of liquid crystal as shown in figure 29.The transverse axis of Figure 29 is the time of the vertical cycle that video shows being used as 1 unit, the TSC-system vision signal, and then vertical cycle is 16.7 milliseconds.T1 be select pixel and begin to respond the back, the time to the 1st luminous component of light source till luminous, be here 8.1 milliseconds, T2 be from select pixel, to the time of the luminous end of the 1st luminous component, be about 13.1 milliseconds.

After lighting general wait liquid crystal response intermittence in the past, light intermittent component.Therefore, if Figure 29 represents intermittently to light like that, T1=11.7 millisecond for example then, T2=16.7 millisecond.

Yet present embodiment is shown in (e) part of Figure 27, and purpose is make oblique line 1,3 and oblique line 2 suitably balanced, so that make hangover not remarkable.Therefore, preferably determine to write the luminous phase place of the 1st luminous component of running, and the response wave shape (repeating to refresh the timing of (rewriting) operation) of the paired liquid crystal of this phase settings is left the latter half of its approximate centre with respect to pixel according to the time constant of liquid crystal.

Figure 30 (a)～Figure 30 (c) and Figure 31 are the figure of the effect of the present embodiment in the light-emitting mode of explanation duty factor D=30%, luminous strength ratio S=70%.Here, shown in Figure 30 (a), be taken as the situation (reach 90% time be 8 milliseconds) of timeconstant=3.5 millisecond.Under this condition, calculate with model shown in Figure 27.At this moment, the phase place of the 1st luminous component as shown in figure 31, under the situation of T1=10.5 millisecond, T2=15.6 millisecond, hangover amount minimum, its value is for about 0.37 pixel.

At this moment Figure 30 (b) and Figure 30 (c) illustrate the hangover waveform with respect to the space.According to the Fourier transform of the fluorescent lifetime response wave shape of pixel, flicker amount at this moment is 0.49.Mark this hangover amount 0.37, flicker amount 0.49 among Fig. 8 (a), then distinguish compared with the prior art, hangover amount and flicker amount improve simultaneously.

In the present embodiment, as display board 12, be thought of as the transmission-type display board, but also can be the reflection-type display board.At this moment, light source 11 can be configured in display surface homonymy with display board 12.

In the present embodiment, illustrated with light source 11 be configured in display board 12 under the end penetrate the type back-lighting, but generally also be suitable for other according to the type back-lighting.That is, can make the illumination light that light guide plate autogamy in the future by compositions such as propylene is set to the opposed light source 11 in the side end face of this light guide plate and be directed to display board 12, illumination display board 12.

In sum, in the present embodiment, utilize light source to realize the fluorescent lifetime response suitable with the 2nd luminous component, thereby can improve hangover and these two picture quality obstacles that glimmer with the 1st luminous component.Here, can be with light emitting diode semiconductor light-emitting elements such as (LED) and cold-cathode tube fluorescent light (CCFL) etc. as light source 11.

Embodiment 3

Present embodiment illustrates that the display board of device for video display of the present invention is the situation of for example self luminous active matrix organic EL plate.

Shown in figure 32, the pixel 20 of organic EL plate that is located at the device for video display of present embodiment comprises selection TFT21, capacitor 22, the EL liquid crystal 23 of selecting each pixel to use, makes electric current circulate the EL drive TFT 24 and the brightness switching TFT 25 of usefulness in EL element 23.

During pixel selection, the capacitor 22 that connects the drain electrode of selecting TFT21 is supplied with and the suitable voltage (or electric charge) of video that shows from external power source.Select the grid of the drain electrode connection EL drive TFT 24 of TFT21, during non-selection, the electric current of the voltage decision that capacitor 22 is charged is circulated between the source electrode-drain electrode of EL drive TFT 24.

The drain electrode drain electrode EL element 23 of EL drive TFT 24, the drain current by circulation EL drive TFT 24 in the EL element 23 makes EL element 23 carry out luminous with the luminous intensity corresponding with electric current.

Drain electrode-the source electrode that brightness is switched TFT25 is inserted between the grid and ground of EL drive TFT 24.The grid drain electrode scan electrode 26 of TFT25 is switched in brightness.Equally, select the grid of TFT21 also to connect scan electrode 27.

Figure 33 illustrates the related sequential chart of running of the organic EL plate with pixel shown in Figure 32.As shown in figure 33, with respect to the pulse of scan electrode 27, the phase place of the pulse of scan electrode 26 only offset load compares D.And, make brightness switch the TFT25 conducting by timing in the D% time delay, with the grounded-grid that EL drive TFT 24 drives, when selecting the TFT21 conducting, eliminate the electric charge of charging in the capacitor 22.

Therefore, the corresponding reduction of the grid potential of EL drive TFT 24, the electric current of circulation changes in the EL element 23.Its result, EL luminous intensity variations, the luminescent waveform shown in (c) part of formation Figure 33.Here, the longitudinal axis of Figure 33 (c) is an instantaneous light emission intensity.This waveform is with illustrated in fig. 2 identical, even thereby with organic EL plate as under the situation of display board, flicker and hangover amount both are improved.

Can adjust the charge volume of capacitor 22 according to the time during for example pulse of scan electrode 26 " height ", thereby luminous strength ratio S is controlled to the luminous strength ratio of hope.On the path of source electrode-drain electrode-ground connection that perhaps can be by switching TFT25 in the grid of EL drive TFT 24-brightness current limiting element is set, adjusts the quantity of electric charge, thereby adjust the voltage of capacitor 22, with the luminous strength ratio of formation phase place from capacitor 22 filterings.

The grounded drain of TFT25 is switched in brightness, but also can for example make it connect negative supply.Like this, when eliminating the electric charge of capacitor 22, movement of electric charges speed is improved.

Also can constitute the two ends that drain electrode-source electrode that TFT25 is switched in brightness is connected capacitor 22, two terminal shortcircuits of scan electrode 26 capacitor during " height " time are to adjust charge volume.

Illustrated that above display board is the situation of organic EL plate, but also can be for example in non-light emitting-type LCD panel, control writes the data of pixel, and modulation is from the illumination light of light source, thus the pixel luminescent waveform of explanation in the realization embodiment of the present invention 1.Under the situation of liquid crystal board, pixel comprises pixel selection TFT and capacitor, but it is identical with Figure 32, can switch TFT by inserting brightness, the electric charge of control capacitor, the transmissivity of change liquid crystal, thereby set the brightness of pixel, also can not add brightness and switch TFT, and during 1 frame (frame is for constituting the unit of picture), carry out 2 times or more times incoming pixel selection TFT, thereby write the data suitable with different brightness.

Embodiment 4

The device for video display of another embodiment of the present invention is described with Figure 34 to Figure 36.As shown in figure 34, the device for video display 30 of present embodiment comprises display board (video display unit) 31, controller 32, row driver 33, line driver 34, light source controller 35, lamp (light source body, the 3rd light source body) 36, optical gate (light control member, optical gate parts) 37, light guide plate (light mixing member) 38 and bulb 39.

Among Figure 34, stagger in the position that is described as display board 31 and light guide plate 38, but in fact with they stacked uses.From light guide plate 38 side end face input linear light source or be configured to the point source of light of wire, light guide plate 38 should be imported light, and to be transformed into face luminous, and display board 31 is thrown light on.Be called this group of back-lighting light source composition other according to type.

Display board 31 is transmissive liquid crystal panel for example, will form rectangular according to a plurality of non-light emitting-type pixel (not shown) of incoming video signal light modulated transmissivity on display board 31.

Controller 32 outputs to row driver 33 with vision signal, by this vision signal modulated pixels.Controller 32 also outputs to line driver 34 with the Displaying timer signal, and vertical synchronizing signal 41 is outputed to bulb 39.Bulb 39 output control signals 42, control optical gate 37.

Present embodiment is characterised in that the light by Optic gate 37 control illumination display boards 31 as explanation in the embodiment of the present invention 1,2, improves hangover amount and flicker amount simultaneously.That is, optical gate 37 is with the output of optical mode control lamp 36.Optical gate 37 is in the time of the 1st luminous component illumination display board 31, with 100% or near the illumination light of 100% ratio transmission lamp 36.

On the other hand, optical gate 37 makes the illumination light half transmitting of lamp 36 in the time of the 2nd luminous component illumination display board 31.Transmissivity during half transmitting illustrates with Fig. 2, for (100-S)/S*D/ (100-D).

Figure 35 is the sequential chart of the running usefulness of explanation device for video display 30 shown in Figure 34.(a) part of Figure 35 is the signal waveform of vertical synchronizing signal 41, (b) part of Figure 35 is the transmissivity time of the optical gate 37 of control signal 42 controls to change waveform, (c) part of Figure 35 is for getting the luminescent waveform of the lamp 36 of instantaneous light emission strength ratio on the longitudinal axis, (d) part of Figure 35 is for getting waveform time response of the illumination light of passing through optical gate 37 of instantaneous light emission strength ratio on the longitudinal axis.The illumination light of (d) part of Figure 35 is through light guide plate 38 illumination pixels.Shown in (c) part of Figure 35, lamp 36 is luminous with certain certain brightness.Perhaps the luminescent waveform of lamp 36 can be the waveform of such frequency variation that does not respond with human eye illustrated in fig. 17, promptly is identified as the waveform of constant brightness by the human eye characteristic.

Shown in Figure 35 (b) part,, make the illumination light of illumination pixel become the waveform shown in (d) part of Figure 35 from the waveform transformation shown in (c) part of Figure 35 by transmission, half transmitting with control signal 42 control optical gates.Here, the transmissivity during half transmitting is about 30%, and the waveform of (d) part of Figure 35 is that about 33%, luminous strength ratio S is about 60% situation with respect to the duty factor D of the 1st luminous component.The effect such as the enforcement mode 1 of (d) part of Figure 35 are illustrated.That is, shown in (d) part of Figure 35, in the device for video display 30 of present embodiment, also utilize the 1st luminous component and the 2nd luminous component to show video, thereby can improve hangover and flicker simultaneously.

The liquid crystal board of available for example static drive is realized optical gate 37.The optics optical gate is difficult to have 0% transmissivity, promptly be difficult to have the characteristic that light is blocked fully, even if but the optical gate 37 of present embodiment can also make the optical gate of illumination light half transmitting with can not fully photoresistance being broken, thus the optics optical gate can not only be used, and can use various optical gates.

In the present embodiment, lamp 36 is got final product so that constant luminance is luminous, needn't repeat to light to extinguish.Therefore, such life-span of for example CCFL can be made lamp because of extinguishing the light source body and function that shortens of action.And, owing to make lamp 36 luminous, be not easy to produce uneven luminance with constant luminance, can be convenient to design light guide plate 38.

Because lamp 36 often lights, be not easy light source controller 35 is applied electric stress, be difficult to the fuse malfunction takes place and the disadvantage that fuses.And because the ripple current of circulation reduces in the electrolytic condenser (not shown) of light source controller 35 inside, the reliability of light source controller 35 improves.

The device for video display of present embodiment is taken as optical gate 37 is contained between lamp 36 and the light guide plate 38, be illustrated, but the " loaded " position of optical gate 37 can be made like this.For example, also can load optical gate 37 between light guide plate 38 and display board 31, much less this be.

37 pairs of whole illumination light of optical gate work, but partial illumination light is not when inciding light guide plate 38 by optical gate, also can be with this light as illumination light, thereby strict, 37 pairs of whole illumination light of optical gate are worked.

Illustrated optical gate 37 is configured between lamp 36 and the light guide plate 38, the illumination light to light source is worked, but also can utilize signal Processing video signal displayed to be equivalent to the processing of optical gate.

For example mlultiplying circuit is set at the video treatment circuit, with intermittently luminous suitable during to vision signal multiplying factor 1.0.That is, the vision signal former state is passed through.On the other hand, with continue luminous suitable during to vision signal multiplying factor 0.3.That is, after the gray scale intensities level compression with vision signal, make its output.At this moment, light source is with constant lasting luminous the illumination.The screen intensity of utilizing the video that this running shows partly is equal to (d) of Figure 35.

The also available composition shown in Figure 36 of the device for video display of present embodiment is realized.The part mark identical symbol identical with Figure 34.As shown in figure 36, optical gate (light control member, optical gate parts) 43 is arranged to the illumination light of local blocking-up from lamp 36.That is, directly be directed to light guide plate 38, be not subjected to optical gate blocking-up or transmission from a part of illumination light of lamp 36.

The light that optical gate 43 makes lamp 36 when turn-offing is with 0% ratio transmission, when opening with 100% ratio transmission.Optical gate 43 is pressed the waveform shown in Figure 35's (b) part and repeated transmission, blocking-up, and is luminous thereby lamp 36 carries out with constant brightness, shown in (c) part of Figure 35.

Optical gate 43 repeats transmission, blocking-up so off and on, a part of illumination light of lamp 36 is worked, thereby form the waveform shown in (d) part of Figure 35 from the illumination light of lamp 36.With optical gate 43 be arranged to block, the illumination light of transmission part lamp 36 gets final product, as optical gate 43, can be large-scale, thereby can improve the physical strength of optical gate to large-scale display device.Among Figure 36, be described as just like individual light sources and the optical gate 43 that constitutes lamp 36 is set, but may not need such setting with 1 pair 1 relation.Also can constitute every a plurality of individual light sources 1 optical gate is set.

The device for video display 30 of present embodiment can see that the difficult CCFL that does intermittently to light is as light source from reliability and life-span aspect owing to do not make lamp 36 light on and off.Certainly, also can be with LED as light source.

If the blocking characteristics of optical gate 43 is 0%, is illustrated, but also can is 3% blocking characteristics for example.Its reason is, can will penetrate the light of optical gate 43 as illumination light.Therefore, blocking characteristics needn't strictly be 0%.

In sum, in the present embodiment, Optic gate 37 or 43 produces the illumination light of the time response that is equivalent to the 1st luminous component and the 2nd luminous component.Therefore, the device for video display of present embodiment is not direct control lamp 36, thereby lamp and power supply is not added burden.Moreover the device for video display of present embodiment is identical with the device for video display of flicker embodiment of the present invention 1, also can suppress hangover again, with profile clearly show usefulness object, reduce the obstacle that glimmers again.

Embodiment 5

The following describes the device for video display of another embodiment of the present invention.As shown in figure 37, the device for video display 50 of present embodiment comprises display board (display unit) 51, light-emitting device at intermittence (light source body) 52, continues light-emitting device (light source body) 53 and timing generation device 54.

Display board 51 constitutes display board 51 by non-autoluminescence and transmission and modulation from the non-luminous transmissive liquid crystal panel of the light of light source etc.

On display board 51, will form rectangular according to a plurality of pixels (not shown) that vision signal 55 is modulated.Synchronously carry out this modulation running with the vertical synchronizing signal of vision signal 55.When for example vision signal was the TSC-system vision signal, the frame period (vertical synchronizing signal repetition period) was 60 hertz.

Regularly the synchronous vertical timing signal 56 of vertical synchronizing signal of generation device 54 generations and vision signal 55 outputs to intermittently light-emitting device 52.Intermittently light-emitting device 52 is to carry out with the synchronous luminous running of vertical timing signal 56 and toward the light source of the intermittently luminous light 58 of display board 51 outgoing as the illumination light of illumination display boards 51.Intermittently luminous light 58 is the intermittent lights that synchronously utilize rect.p. shape waveform that the illuminating state luminous intensity is shown with vertical timing signal 56 and extinguish state light intensity.

Continuing light-emitting device 53 is to the light source of display board 51 outputs continuing luminous light (lasting light) 57 as the illumination light of illumination display board 51.The intensity that continues luminous light 57 is constant, and irrelevant with vertical timing signal 56, perhaps the repetition frequency with vertical timing signal 56 for example changes more than or equal to 150 hertz.

The observer is to repeating the light of light on and off with about 150 hertz frequency, sensitivity is very low, and is almost reactionless to the light that repeats light on and off with the frequency above about 300 hertz.Therefore, even if lasting luminous light 57 strictnesses are the light by certain cyclical swing, light on and off, human eye also is identified as by certain intensity and carries out luminous light.

So the pixel on the display board 51 is according to the illumination light of vision signal 55 modulation from intermittence light-emitting device 52 or lasting light-emitting device 53.Illumination light after the modulation is sent from the display frame of display board 51, allowed the observer be identified as the demonstration video.

Figure 38 is the sequential chart of running usefulness of the device for video display 50 of explanation Figure 37, and the time that the luminous intensity of the signal of each path transmission and light is shown changes.Among Figure 38, the transverse axis express time is a unit description with the frame of vision signal 55.

(a) part of Figure 38 illustrates the signal waveform of the vertical synchronizing signal of vision signal 55.Shown in (a) part of Figure 38, as the vertical synchronizing signal of vision signal 55, each frame output square wave.(b) part of Figure 38 illustrates the regularly signal waveform of the vertical timing signal 56 of generation device 54 outputs.Shown in (b) part of Figure 38, vertical timing signal 56 synchronously repeats break-make with vertical synchronizing signal.

The longitudinal axis of (c) part of Figure 38 is an instantaneous light emission intensity, and the time that the lasting luminous light 57 that continues light-emitting device 53 outputs is illustrated instantaneous light emission intensity changes.Shown in (c) part of Figure 38, continue luminous light 57 and irrespectively carry out luminous with vertical synchronizing signal.

The longitudinal axis of Figure 38 (d) part is an instantaneous light emission intensity, illustrate intermittently light-emitting device 52 outputs intermittence luminous light 58 instantaneous light emission intensity.Shown in (d) part of Figure 38, intermittently light-emitting device 52 makes intermittently luminous light 58 and synchronously light on and off of vertical synchronizing signal.That is, intermittently instantaneous light emission intensity and the instantaneous light emission intensity (about 0.7) that vision signal synchronously repeats illuminating state and the instantaneous light emission intensity (0) of extinguishing state of luminous light 58 present the precipitous rect.p. of rising edge and negative edge.

(e) part of Figure 38 illustrates the transmissivity of any pixel of vision signal 55 decisions, and the longitudinal axis is represented transmissivity.Shown in Figure 38 (e) part, the pixel of display board 51 is imported white video, other frame period (for example the 0th cycle and the 4th cycle) input blackout picture in certain frame period (for example the 1st vertical cycle to the 3 vertical cycles during).

With the instantaneous light emission intensity of the lasting luminous light 57 shown in Figure 38 (c) part with shown in (d) part of Figure 38 intermittence luminous light 58 (e) part of instantaneous light emission intensity sum and Figure 38 shown in the brightness of (f) display image shown in partly of long-pending Figure 38 of being of multiplying each other of pixel transmission rate.

Like this, the device for video display of present embodiment is characterised in that, with luminous light 58 at the intermittence illumination light illumination display board 51 different with continuing luminous light 57 these characteristics, shown in (f) part of Figure 38.Its effect is, and is illustrated as above-mentioned embodiment of the present invention 1, makes to improve hangover and reduce flicker and taken into account.

Promptly, the 1st luminous component of the invention described above embodiment 1 explanation and the definition of the 2nd luminous component are different with the definition of the luminous component at intermittence (the nicking part of Figure 38 (f)) of present embodiment explanation, lasting luminous light (the cross hatch part of (f) part of Figure 38), but they can carry out conversion described below with Figure 39 (a) and Figure 39 (b).Figure 39 (a) illustrates the 1st luminous component and the 2nd luminous component of embodiment 1, the light intensity that mixes of the lasting luminous light 57 that Figure 39 (b) illustrates 1 vertical cycle and luminous light 58 intermittently.A, b, c among Figure 39 (a) and Figure 39 (b) represents brightness (instantaneous light emission intensity).

Shown in Figure 39 (b), S1=c*D=(the * D% of a-b).Shown in Figure 39 (a), a=S/D, b=(100-S)/(100-D).So, formation S1={S/D-(100-S)/(100-D) } * D.Therefore, with the duty factor D of this formula conversion embodiment 1 explanation, the condition of luminous strength ratio S, then obtain S1.Duty factor D is identical with embodiment 1.

Like this, we can say and mix to continue luminous light 57 and intermittently luminous light 58 and the identical light of light that only obtains with mixing the 1st luminous component and the 2nd luminous component in fact that obtains.So the device for video display 50 of present embodiment, its light from light source comprise lasting luminous light 57 and luminous light 58 at intermittence, each component is luminous with different property driving.Thereby, can driving circuit and driving power be set by lasting luminous special use or luminous special use at intermittence, can simplify circuit and form, seek to reduce cost.Each is luminous owing to can control respectively with circuit separately, and the reliability of circuit is improved.

For example suppose to adopt in the light source situation of LED again.Commercially available LED exist the absolute maximum rated current when lighting continuously little light with pulse the time the moment maximum rated current little.The device for video display 50 of present embodiment can separately use the LED of lasting illuminating and the LED of illuminating at intermittence according to such LED electrical characteristics.

Also can intermittently adopt LED in the luminous purposes, continue luminous purposes and then use cold-cathode tube (CCFL).The luminescence response of LED is at a high speed, and cold-cathode tube is towards the light source of lighting continuously.Can consider this light source characteristic, select light source, be installed to device for video display.

In sum, in the present embodiment, by mixing from continuing light-emitting device 53 and intermittently light-emitting device 52 luminous, irradiation display board 51, thus can realize not only suppressing the hangover clear display profile of mobiles but also the image demonstration of the obstacle that suppresses simultaneously to glimmer.That is, have towards the light source of continuous emitting characteristics and have, can realize the characteristics of luminescence shown in Figure 2 easily towards the light source of emitting characteristics at intermittence by use.

The brightness of display board 51 improves, and then perceives flicker (Ferry-Porter rule) easily.Therefore, when making with the high brightness display image, the flicker obstacle takes place easily.The body of rod of the cellula visualis of human eye than cone to the light on and off sensitivity, promptly the periphery of visual field than the center to the light on and off sensitivity, so that the display board of device for video display when maximizing, identification flicker obstacle easily.Therefore, to be used to improve the quality of device for video display of high brightnessization and giant-screenization especially effective for the device for video display of present embodiment.

Moreover, as the luminous strength ratio that continues luminous light 57 (100-S1) % components can be the degree that can see easily.During the impulse type of prior art is luminous, dwindle duty factor, when obtaining identical screen intensity, need to improve instantaneous light emission intensity.Instantaneous light emission intensity is not got under the situation of big light source, must increase the number of using, be related to cost and improve.Do not increase number, then average screen brightness reduces.In the present embodiment,, also can improve hangover amount and flicker amount simultaneously, so can suppress the instantaneous light emission brightness of luminous light 58 intermittently low seeing under the situation that continues luminous light 57.

For example among Fig. 3 (a), the instantaneous light emission brightness that continues luminous component is 260 nits.Among Fig. 3 (b), the instantaneous light emission brightness that continues luminous component is 50 nits.In Fig. 3 (a) luminous, continue luminous component and get luminous strength ratio (100-S1) % are 58%, and Fig. 3 (a) forms (luminous intensity of 100-S1)=260 nits because the hypothesis screen intensity is 450 nits.This intensity can be seen easily.Among Fig. 3 (b), (100-S1)=25%, Fig. 3 (b) forms (luminous intensity of 100-S1)=50 nits because the imagination screen intensity is 200 nits.This luminous intensity is indistinct luminous brightness, but can see.

In the present embodiment, if the display board of Figure 37 51 is illustrated for non-luminous transmission-type, but also can use the means of illumination identical with the device for video display 50 of present embodiment to getting non-luminous reflection-type display board that irradiates light modulates from light source by reflection.

Keep driving display to utilize TFT (thin film transistor (TFT)) for example etc. also can on display board 51, realize the effect identical with lasting light-emitting device 53 to organic EL emissive type with the light-emitting device 52 at intermittence of Figure 37.

In the present embodiment, the vertical synchronizing signal that vision signal has been described is the situation of 60 hertz TSC-system vision signal, but also can use the light-emitting device 52 and means of illumination of lasting light-emitting device 53 at intermittence of present embodiment to 75 hertz such vision signal of the rgb video signal of for example personal computer.

In the present embodiment, its statement is if the light that lasting light-emitting device 53 sends is constant, and is irrelevant with vertical timing signal 56, but under the situation that this light that sends and vertical timing signal 56 irrespectively change.Also can be used for present embodiment.When having the control circuit for light source of using for example light modulation (adjustment brightness) of 500 hertz PWM (width modulation) enforcement light source, also can adopt this light source and control circuit thereof, as the lasting light-emitting device 53 of present embodiment.This is because human eye is not followed the tracks of 500 hertz frequency, it can be regarded as just like carry out luminous with constant luminous intensity.

In the present embodiment, as shown in figure 38, in each frame period, (d) of vertical synchronizing signal center and the Figure 38 of the vision signal 55 shown in Figure 38 (a) part shown in partly intermittence luminous light 58 luminous phase center consistent.Like this, preferably intermittently luminous light 58 to repeat timing be that the phase place at center is carried out luminous vision signal is refreshed (rewritings) running.That is, we can say (a) part of Figure 38 and (d) phase relation that illustrates respectively of part be preferable states near the first trip of vision signal (be vertical synchronizing signal rising edge of (a) part of Figure 38 video).

In the past, because for example exponential function response of the liquid crystal material material that constitutes pixel like that, can make that to refresh the luminous timing of repetition timing of running (video data upgrades running) with respect to vision signal consistent with the concluding time of refreshing running with time constant.

Yet present embodiment is made in the oblique line 1 shown in Fig. 4 (e) part, oblique line 2, oblique line 3 and is utilized human eye low to the dynamic contrast response, makes oblique line 1 and oblique line 3 can not get identification.

And the slope of these oblique lines 1 and oblique line 3 is by refreshing the phase decision of running with respect to the vision signal of luminous light 58 intermittently.Therefore, in order to produce oblique line 1 and oblique line 3 balanced good so that make it not discerned by the observer, the rewriting that repeats made from respect to vision signal operates, and intermittently the phase place of luminous light 58 is in the center.That is, can make the pulse with respect to vision signal, intermittently the pulse waveform of the luminous intensity of luminous light 58 is in the center.

Embodiment 6

The device for video display of another embodiment of the present invention is described with Figure 40 to Figure 46.

Figure 40 is the block diagram of composition that the device for video display of another embodiment of the present invention is shown, as shown in the drawing, device for video display 60 comprises display board (video display unit) 61, Video Controller 62, data driver 63, scanner driver 64, row electrode 65, column electrode 66, lamp drive circuit (the 1st light source body driver part) 67, lamp drive circuit (the 2nd light source body driver part) 68, lamp (the 1st light source body) 69, lamp (the 2nd light source body) 70 and carry over testing circuit (carry over detection part) 77.

The row electrode 65 of row shape and the column electrode 66 of the shape of aligning are lined up in configuration on display board 61.Display board 61 is that the optical transmission type from light source is also modulated in transmission.A plurality of pixels (not shown) formation is rectangular at row electrode 65 with the intersection point of column electrode 66.

Data driver 63 drives pixel according to data-signal 72, the transmissivity of pixel is set for the state that is determined by data-signal 72.Sweep signal 73 has the information of horizontal-drive signal and vertical synchronizing signal.Horizontal-drive signal is the unit of display of the column direction (horizontal direction) of display frame, and vertical synchronizing signal is the unit of display of the line direction (vertical square to) of display frame.The frequency of vertical synchronizing signal is 60 hertz in TSC-system vision signal for example.

Scanner driver 64 successively scans and selects column electrode 66 from the top of screen toward the below according to the horizontal-drive signal timing of sweep signal 73.And the vertical synchronizing signal timing according to sweep signal 73 resets into screen top with the column electrode of selecting 66.

When paying close attention to certain pixel on the display board 61,, select the cycle of this pixel then to be 16.7 milliseconds if the frequency of vertical synchronizing signal is 60 hertz.Video Controller 62 produces lamp control signal 74 according to the vertical synchronizing signal of vision signal 71, outputs to lamp drive circuit 67.So lamp drive circuit 67 is according to lamp control signal 74 control lamps 69.The output of lamp 69 is by the luminous light at intermittence of lamp control signal 74 controls (intermittently luminous component) 75.Available single or multiple LED (light emitting diode) realizes lamp 69.Intermittently luminous light 75 illumination display boards 61.

Lamp drive circuit 68 control lamps 70.The luminous output of lamp 70 is to continue luminous light (continuing luminous component) 76.The such fluorescent light of available single or multiple CCFL (cold-cathode tube) is realized lamp 70.Identical with lamp 69, also can realize lamp 70 with LED.Continue luminous light 76 also with the display board 61 that similarly throws light on of luminous light 75 intermittently.In lamp 69,70 spaces, intermittently luminous light 75 and lasting luminous light 76 are mixed to display board 61.

Carry over testing circuit 77 is judged carry over (variation) degree that shows video according to vision signal 71, promptly judges carry over amount (variable quantity).Detected carry over signal 78 is outputed to lamp drive circuit 67, lamp drive circuit 68.

Figure 41 is the sequential chart of the running usefulness of explanation device for video display 60 shown in Figure 40, and the time that the luminous intensity of the signal of each path transmission and light is shown changes.Transverse axis is the time, is the unit description time shaft with the frame of vision signal 71.Here, frame is meant the unit of the display frame of vision signal 71, is determined by vertical synchronization.

(a) part of Figure 41 illustrates the signal waveform of the vertical synchronizing signal of vision signal 71.(b) part of Figure 41 is the luminescent waveform of luminous light 75 at intermittence, and is synchronously intermittently luminous with vertical synchronizing signal.In (b) part of Figure 41, the longitudinal axis is an instantaneous light emission intensity.

(c) part of Figure 41 is the luminescent waveform that continues luminous light 76, irrespectively carries out luminous with vertical synchronizing signal.The longitudinal axis of Figure 41 (c) is an instantaneous light emission intensity.Figure 41 (d) part is the waveform of mixed lighting light, is illustrated in the leaded light space that arrives display board 61 waveform of the light that obtains after mixing of lasting luminous light 76 to the intermittence of Figure 41 (c) luminous light 75 and Figure 41 (d).

Here, the device for video display of present embodiment is characterised in that, with carry over testing circuit 77 control lamp drive circuits 67,68.Carry over is meant that time of picture unit of the image of demonstration changes, and is the overall activity of picture.Though be not that strict scene is switched, also be equivalent to situations such as picture photographing panorama, big object is mobile in fixing picture, the big zone of video in picture changes.

Figure 42 (a) and Figure 42 (b) are examples of carry over testing circuit 77.Among Figure 42 (a) and Figure 42 (b), write oblique line and numerical value on signal wire, the position of expression digital signal is long.

Carry over testing circuit 77 shown in Figure 42 (a) uses F (frame) storer 80, get the frame-to-frame differences of each pixel of vision signal 71 at subtracter 81, be the difference of current demand signal with the signal of 1 frame that lags of certain pixel, judge variation, activity between carry over or picture in view of the above.

Make from the signal of totalizer 81 by behind ABS (absolute value) circuit 82, in comparer 83 and threshold value 84 relatively, thereby be 1 detection signal herein.Serves as to add up at interval with comprising the circulation addition mechanism that carries out the latch circuit 85 of work and totalizer with system clock with the pixel to this signal.

The circulation sum signal anchoring that produces is like this being carried out the latch circuit 87 that breech lock operates with lamp control signal 74.Each vertical running signal carries out this breech lock running.That is, during this circuit is formed, to the interframe difference of pixel in 1 picture unit greater than counting with the number of times that equals certain threshold value.

IIR (circular form) wave filter 88 will be used as sampling clock with the synchronous lamp control signal 75 of vertical synchronizing signal.Make the output of latch circuit 87 pass through IIR (circular form) wave filter 88, thereby apply screening at time-axis direction.The carry over signal 78 that iir filter 88 outputs produce like this.

For example carry over signal 78 is taken as 3 long, and hypothesis frame-to-frame differences big vision signal consecutive hours be grades 7 value, the vision signal consecutive hours that frame-to-frame differences is little is 0 grade a value, then the carry over signal is got big value when frame-to-frame differences frequently produces.

Here, suppose that vision signal 71 is 8, but, be about 4, then can reduce memory capacity in the stage that is input to F storer 80 owing to be 1 in the comparer 83.When for example interleaved signal being transformed into progressive-scan signal, detect, require high Precision Detection to go out frame-to-frame differences in order to carry out general activity.Yet, under the situation of the device for video display 60 of present embodiment, detect frame-to-frame differences, with the luminous quantity of the light source in all or part of zone of control illumination picture, thereby few high precision like that requires.

And 1 pixel is handled at interval, needn't detect interframe difference to the All Time of vision signal 71.At this moment, can reduce the memory capacity of F storer 80.Can reduce the operating rate (system clock frequency) of testing circuit again.By adjusting time constant α, can realize also responding gently to following the tracks of light source control response jumpy the time response that the carry over degree changes as the iir filter of recursive filter.Can adjust constant alpha according to the purposes of condition such as screen intensity and device for video display.

For example in the composition of Figure 42 (a), if α=0.5, then the indicial response time of filtering (from the input signal of iir filter change the time be carved into time till 90% the value of input signal after output changes) be the time of about 5 frame shares (1/60*5=1/12 second); α=0.95, then the indicial response time of filtering is about 1 second.

Figure 42 (b) is the block diagram that the composition of the carry over testing circuit 77 when judging carry over amount and carry over degree according to the frame-to-frame differences of the APL (average level) of frame unit (vertical synchronization unit) is shown.APL testing circuit 89 is made division arithmetic (average computation) behind the data accumulation with vision signal 71 successively.After each vertical cycle of APL that 90 pairs of APL testing circuits 89 of D-FF (trigger) of making breech lock with lamp control signal 74 are calculated carries out breech lock, get at subtracter 91 that it is poor.

After the processing in ABS (absolute value) circuit 92, tackle the stoning processing that noise is used at stoning circuit 93, and output carry over signal 78.Stoning is meant: if with the value of 4 signals performance 0～15, then applying and forcing to make small value (for example 0,1,2) is screening such as 0.

Like this, from stoning circuit 93 output carry over detection signals.The carry over signal is judged as scene and changes greatly the signal of output stage 15 when the difference of for example interframe APL is big.Otherwise, under the equable situation of APL, output stage 0.The composition of Figure 42 (b) then can be from the frame memory of carry over testing circuit 77 omission Figure 42 (a).

Figure 43 is the figure that the illumination light that schematically contrasts bright display board 61 illustrates the luminescent waveform of 1 vertical cycle.This is the waveform that obtains after the leaded light space that for example arrives display board 61 will continue luminous light 76 and intermittently luminous light 75 mixes.Intermittently the fluorescent lifetime of luminous light 75 is D%, and the peak value of instantaneous light emission intensity is a nit, and luminous strength ratio is S2%.Among Figure 43, have nicking with the luminous intensity that intermittently luminous light is corresponding.The fluorescent lifetime that continues luminous light 76 is T second, and the peak value of instantaneous light emission intensity is the b nit, and luminous strength ratio is (100-S2) %.Among Figure 43, the luminous intensity corresponding with continuing luminous light has oblique line.

Term " luminous strength ratio " is: continue luminous light or intermittently the luminous intensity of luminous light to the ratio of the pixel population mean luminosity in 1 vertical cycle.Intermittently the luminous intensity of luminous light is with the time of duty factor D%, and the peak value a of the instantaneous light emission intensity that continues luminous light is carried out integration with the value of difference a-b of the peak value b of the instantaneous light emission intensity that continues luminous light." luminous intensity " is with the time instantaneous light emission intensity to be carried out principal value of integral.

The device for video display 60 of present embodiment is identical with the invention described above embodiment 1, and its purpose is: improve hangover amount and flicker amount simultaneously.In order to reach this purpose, the illumination light illumination display board 61 of the waveform of device for video display 60 usefulness Figure 43 of present embodiment.The luminous strength ratio S of explanation is different with the definition of the luminous strength ratio S2 of Figure 43 in the embodiment 1, but can make here with transform S2={S/D-(100-S)/(100-D) } * D is transformed into luminous strength ratio S with luminous strength ratio S2, the luminous strength ratio S after the conversion then is fit to condition A, condition B shown in Figure 12.

Figure 44 (a)～Figure 44 (c) is the figure of explanation with the process example of the illumination light of carry over detection signal control illumination display board 61.In order to control illumination light, with carry over amount adaptive control lamp drive circuit 67,68.

Here, suppose that the carry over amount is big more, the carry over degree is big more.And, illustrate the luminous strength ratio S2 of luminous light 75 intermittently is fixed as 80% and utilize the situation of the setting of carry over detection signal adaptive control duty factor D.Particularly, shown in Figure 44 (a), be controlled to, duty factor D is dwindled along with carry over detection quantitative change is big.

Figure 44 (b) be illustrate Figure 44 (a) like that control load than the time the hangover amount and the figure of the characteristic of flicker amount.Figure 44 (c) obtains the data that the characteristic of Figure 44 (b) is used.Area surrounded and corresponding mutually with the frame area surrounded is enclosed in using that Figure 44 (a) and Figure 44 (b) illustrate.

In the present embodiment, when the carry over amount is big, is judged as movable many big or movable pilositys on the picture, thereby uses the middle duty factor of Figure 44 (a) with the circle area surrounded.Use is during with the duty factor of circle area surrounded, and shown in Figure 44 (b), with respect to use the frame area surrounded, the hangover amount reduces, but flicker amount increase.

When stipulating the environmental baselines such as ambient illuminance of screen intensity, picture scale, rating, the flicker amount that observer can be discerned is decided, and is the trend that live image or rest image change but this flicker measurer has by picture displayed.For example under the situation of the device for video display of making the personal computer purposes, rest image is the center, and tolerable limit flicker amount is little.That is, even flicker also appears easily a little.Otherwise under the situation of live image, flicker amount to a certain degree is difficult to observed person's identification, and it is not remarkable to glimmer.Utilize this characteristic, though strengthen the flicker amount, the hangover amount reduces, thereby improves the hangover amount ideally.

Shown in Figure 44 (b), the hangover amount of the device for video display 60 of present embodiment is compared with the characteristic of prior art with the characteristic between the flicker amount, enters the lower left, thereby we can say and improve hangover amount and flicker amount simultaneously.

Here, when calculating the characteristic of Figure 44 (b), because luminous strength ratio S2 is fixed, screen intensity does not change because of duty factor D.Yet, also can be for example peak value a, the b (with reference to Figure 43) of instantaneous light emission intensity be taken as fixed value, and carries out the control of duty factor D, not making S2 is fixed value.

At this moment, screen intensity changes because of the control of duty factor D, but corresponding with carry over by the switching that makes duty factor D, even it is remarkable to form on the picture switching point luminance fluctuation yet.Moreover, when picture is movable or when carry over takes place, reduce duty factor D, then screen intensity reduces.Therefore, by controlling, favourable to improving the flicker obstacle toward the more inapparent direction of flicker.

For example can control, make S2 not be fixed value, and to change peak value a with duty factor D linkage manner.For example, b is used as fixed value with peak value, and control peak value a, making duty factor D is that 70% o'clock peak value a is 200 nits (just intermittently the luminous intensity of luminous light 75 is equivalent to 140 nits), being 400 nits (intermittently the luminous intensity of luminous light 75 is equivalent to 200 nits) during D=50%, is 900 nits (intermittently the luminous intensity of luminous light 75 is equivalent to 270 nits) during D=30%.

When controlling peak value a like this, the generation activity is also dwindled under the situation of duty factor D, and S2 increases.Otherwise, under the situation of rest image or movable few image, during the high picture of long-time rating brightness, be related to eye fatigue.Therefore, only when picture is movable or during movable many images, improve brightness, increase tone, thereby can realize the live image demonstration of distinctness.Also available and duty factor D linkage manner changes peak value b.Also available and duty factor D linkage manner changes peak value a and peak value b simultaneously.

Figure 45 (a)～Figure 45 (d) illustrates the situation with carry over detection signal control luminous strength ratio S2.Here, suppose duty factor D is fixed as 20% or 40% situation.Utilize to change peak value a or peak value b, change luminous strength ratio S2.Because continuing the luminous strength ratio of luminous light 76 is 100-S2, utilize the intermittently luminous strength ratio S2 of luminous light 75 of control, it is changed in linkage, screen intensity is kept constant.

Figure 45 (b) is the figure of the relation of hangover amount when the characteristic of using Figure 45 (a) is shown and flicker amount.Figure 45 (c) and Figure 45 (d) obtain the data that the characteristic of Figure 45 (b) is used.Among Figure 45 (a) and Figure 45 (b), circle area surrounded and frame area surrounded are corresponding in the drawings mutually.The picture activity after a little while, by carrying out S2, toward strengthening the hangover amount, reducing the direction control of flicker amount.Such when for example compiling data with personal computer, show that video is that rest image is under the situation at center, flicker appears easily.Therefore, by reducing S2, can reduce the flicker amount.

When rest image is the center, also generation activity under the situations such as rolling form.In this case, utilize the device for video display of present embodiment, compare, also can carry out video and show with the characteristic that suppresses flicker amount and hangover amount with the characteristic of prior art.

The also controlled screen intensity of making changes, and duty factor D, peak value a and peak value b fix; An also controlled side or the both sides' interlock of making and making among luminous strength ratio S2 and peak value a and the peak value b makes screen intensity change again.

Opposite during with the demonstration rest image, improve screen intensity during the show events image, then the live image tone increases, and sharpness improves, eye fatigue in the time of avoiding the rating rest image.Otherwise, reduce the brightness of live image, then flicker is not easy to appear, and can improve the degree of improvement of hangover amount.

Can be according to the purposes of device for video display (used as television for example.Personal computer is used), optimal cases is selected in these controls.Perhaps can select Optimal Control according to the characteristic of the lamp of selecting in installing 69,70.For example led light source is controlled the peak value of instantaneous light emission intensity easily, but cold-cathode tube since with the relation of environment temperature, be difficult to control the peak value of instantaneous light emission intensity.Therefore preferably adopt led light source in the lamp 69, control load is than a side and both sides among D and the peak value a.Preferably adopt the cold-cathode tube light source in the lamp 70, b is taken as fixed value with peak value, and controls other parameter.

Figure 44 (a)～Figure 44 (c), Figure 45 (a)～Figure 45 (d) has illustrated the situation of the independent control load of difference than D, luminous strength ratio S, but also can be by changing duty factor D and luminous strength ratio S2 simultaneously, obtain the effect that reduces hangover amount and flicker amount simultaneously.

Figure 46 (a) and Figure 46 (b) illustrate APL information that the carry over testing circuit 77 formed obtains and the carry over amount control load situation than D or luminous strength ratio S2 of using simultaneously shown in Figure 42 (b).

For example APL is low and activity when big, can shown in Figure 46 (a) duty factor D be reduced.Luminous strength ratio S2 is increased.Thus, can highlight the bright spot of the spark that is transmitted into the dark night sky, make it improve hangover again, luminous with higher brightness again.

When APL is high, compare when low with APL, flicker easily significantly.Therefore, shown in Figure 46 (a), it is little when lower than APL to make the reduction rate of duty factor D.It is big when lower than APL perhaps can to make the increment rate of luminous strength ratio S2, shown in Figure 46 (b).

Especially shown in Figure 46 (b), pay close attention to luminous strength ratio S2 like that, and the carry over amount is big when making luminous strength ratio S2 increase lowlyer than APL when big, then utilizes the limiting behaviour of perceiveing the flicker obstacle of observer with respect to APL, improves hangover amount and flicker amount.Luminous strength ratio S2 and duty factor D can distinguish independent control, also 2 characteristics can be lumped together, and control load is than D and luminous strength ratio S2 simultaneously.

In the present embodiment, basically according to the condition illustrated in fig. 12 of embodiment 1, control load is than the relation of D with the luminous strength ratio S that converts from luminous strength ratio S2, but activity after a little while in the video that shows, be the carry over signal that illustrates in Figure 42 (a) and (b) hour, also can adopt S=40% etc. to break away from the value of the condition of Figure 12.It is the reasons are as follows.

Brightness change threshold with the hangover amount among Figure 12 is taken as 15%, 85%.Also be taken as 10%, 90% among Figure 21.Yet the value of critical threshold value is stipulated absolutely not uniquely.This is because the picture quality of device for video display is subjected to the subjective domination of observer.And view environments such as ambient illuminance and viewing distance also change.This value also changes according to the absolute value of screen intensity.At the image that shows is also to change aspect rest image or the live image.In the hangover model of Fig. 4 explanation, for simplified model, the activity of supposing object is 1 pixel constant speed activity.That is, normalization is measured in hangover with moving speed.

Yet in fact the moving speed of object is fast, and the absolute value of hangover amount is big.Show movable lacking in the video, even it is then strengthen the threshold value of hangover amount sometimes, also no problem to display quality.Therefore, when the threshold value of hangover amount is used as the function of activity,, also there is the situation of display quality the best even break away from D, the S value of the condition of Figure 12 and Figure 21.In a word, can derive best D, the S value of activity according to the subjective assessment of the simulation of the hangover model of Fig. 4 explanation and actual display image.

In the device for video display 60 of present embodiment, light source is not limited to LED and CCFL, can suitably adopt to be fit to intermittently luminous and lasting luminous light source.Moreover present embodiment is established the display board 61 of Figure 40 for transmission-type is illustrated, but also can be the reflection-type display board of modulating from the irradiates light of light source by reflection.

In sum, the device for video display 60 of present embodiment changes (being activity) by the time of utilizing carry over testing circuit 77 to detect the picture unit that shows video, and the precision of improving of hangover amount and flicker amount is improved.

Embodiment 7

The device for video display of another embodiment of the present invention is described with Figure 47.As shown in figure 47, device for video display 100 variable light sources (light source body) 101 of present embodiment, light source (light source body) 102, display board (video display unit) 103, diffuser plate 104 and optical gate 105.

In the device for video display 100 of above-mentioned composition, between diffuser plate 104 and optical gate 105, form the space, light source 101 and light source 102 are configured in the below in this space.

For example utilize that LED constitutes these light sources 101,102, but also can utilize other light-emitting component to constitute.Light source 101,102 is toward the lower surface outgoing illumination light of diffuser plate 104.And it is luminous that light source 101 carries out intermittence, the luminous light 106 at intermittence shown in the irradiation dotted line.

On the other hand, light source 102 continues luminous, the lasting luminous light 107 shown in the irradiation solid line.Display board 103 is a transmission-type, and transmission and modulation are by the illumination light of diffuser plate 104.Display board 103 shows the video that the observer watches at the upper surface of itself.

As shown in figure 47, the irradiates light of 2 kinds of different in kinds of light source 101 and light source 102 outgoing one side is in the scope diffusion of the directivity regulation of light source, and one side is mixed during by the space between diffuser plate 104 and the optical gate 105.

Therefore, display board 103 rayed that is subjected to luminous light 106 intermittently and continues to obtain after both irradiates lights of luminous light 107 synthesize.As implement in the mode 5 illustratedly, obtain the identical effect of forming with the 1st luminous component and the 2nd luminous component of light (with reference to figure 2) by mixing these light.Therefore, the display board 103 of present embodiment carries out the identical running of display board 2 in the device for video display 1 with embodiment 1.So, when the display board of present embodiment 103 shows mobile objects, can reduce the hangover amount, show this object with profile clearly, can also suppress the obstacle that glimmers simultaneously.

In sum, in the device for video display 100 of present embodiment, mix to the space of display board at light source and to have illumination light of different nature.For example have and be called the end and penetrate the back-light device (backlight) of type, as this light source as the LCD (liquid crystal indicator) of non-light emitting-type device for video display.This is formed with shown in Figure 47 identical.Therefore, the device for video display 100 of present embodiment can be advantageously used in having the end and penetrate the LCD of type back-light device.

Penetrate the type back-light device generally to be used for the screen diagonal angle be No. 20 situation at least at the end among the LCD.In the large LCD, as indicated above, the observer finds out the hangover obstacle easily, and when adopting existing impulse type luminous in large LCD, the observer also sees the flicker obstacle easily.Therefore, with the device for video display 100 of present embodiment because large LCD then can provide live image to show the best image video of distinctness and flicker free obstacle.

Projector of projection type liquid crystal is such will show that video projects in the device for video display on screen etc., have the output intermittently light source and the light source of exporting lasting luminous light 107 of luminous light 106, irradiates light irradiating liquid crystal plate with two light sources, then the irradiates light of two light sources is mixed in the space that arrives liquid crystal board, thereby obtains the effect of present embodiment.

Present embodiment imagination transmission-type display board, but also can use under the situation of reflection-type.That is, when using the LCD panel of present embodiment in the reflection-type, light source is configured in display surface homonymy with the reflection-type display board.Then, prepare the light source of output luminous light 106 at intermittence and the light source that output continues luminous light 107, with the irradiates light irradiating liquid crystal plate of two light sources, then the irradiates light of two light sources is mixed in the space that arrives liquid crystal board, thereby obtains the effect of the device for video display of present embodiment.

Embodiment 8

The liquid crystal indicator (LCD) of another embodiment of the present invention is described with Figure 48 and Figure 49.As shown in figure 48, the LCD110 of present embodiment comprises liquid crystal board (video display unit) 111, controller 112, row driver (source electrode driver) 113, line driver (gate drivers) 114, power circuit (the 1st light source body driver part, the 2nd light source body driver part) 115, lamp (the 2nd light source body) 116, lamp (the 1st light source body) 117, light guide plate (light mixing member) 118, timing generation circuit (the 1st light source body driver part) 119 and switch (the 1st light source body driver part) 120.

Lamp 116, lamp 117 and light guide plate 118 are referred to as back-light device.Linear light source shown in Figure 48 or the pointolite that is configured to wire are configured to the side end face of light guide plate 118 opposed, it is luminous to be transformed into face from this light source emergent light by light guide plate 118, the illumination display board.Such light source is formed, and is called other according to type.Available for example LED constitutes lamp 116 and lamp 117, and also available other light-emitting component constitutes.

On the LCD panel 111, rectangular formation is according to a plurality of non-light emitting-type pixels of incoming video signal light modulated transmissivity (not shown).Controller 112 outputs to row driver 113 with vision signal, and the Displaying timer signal is outputed to line driver 114, and vertical synchronizing signal 121 is outputed to timing generation circuit 119.Timing generation circuit 119 is by switch 120 output control signals 122.

The LCD110 of present embodiment is characterised in that, by utilizing light guide plate 118, the illumination light that the mixed luminescence characteristic is different.That is, the LCD110 of present embodiment is characterised in that light source comprises 2 groups that are made up of lamp 116 and lamp 117.

Directly lamp 116 is powered by line of electric force 123 from power circuit 115.Therefore, lamp 116 irrespectively carries out luminous with the state of control signal 112.On the other hand, power by line of electric force 124 and 120 pairs of lamps of switch 117 from power circuit 115.With control signal 122 gauge tap 120.

So, from the side end face incident of the illumination light of these lamps 116 and lamp 117 from light guide plate 118.118 pairs of two-way illumination light of light guide plate are simultaneously mixed, and one side is carried out leaded light.Particularly, the light guide plate 118 printed patterns (not shown) that make illumination light diffusion usefulness, thus illumination light is spread, and light is directed to liquid crystal board 111.

Liquid crystal board 111 makes the transmission change of pixel, after will being modulated from the illumination light of light guide plate 118, exports from display surface.The observer shows the video observation with luminous being used as of this display surface.

Figure 49 is the sequential chart of running of the LCD110 of expression Figure 48.(a) part of Figure 49 illustrates the signal waveform of vertical synchronizing signal 121.(b) part of Figure 49 illustrates the signal waveform of control signal 122.

(c) part of Figure 49 illustrates the waveform of the power of line of electric force 123 supplies, and lamp 116 sends lasting light according to this waveform.(d) part of Figure 49 illustrates the waveform of the power of line of electric force 123 supplies, and lamp 117 sends intermittent light according to this waveform.(e) part of Figure 49 illustrates the waveform of the light of light guide plate 118 outputs, belongs to the light that obtains after the light that the light and the lamp 117 of lamp 116 outputs are exported synthesizes.

So the LCD110 of present embodiment is characterised in that to have a plurality of light sources (lamp 116 and lamp 117) of being controlled according to different drive principle, and mix irradiates light from two light sources with light guide plate 118.

Different drive principle, the Linear Driving that pulsed drive that its implication is controlled by vertical synchronizing signal for generation flash of light component is used and generation are not used by the lasting component of vertical synchronizing signal control.So, utilize Linear Driving control to send the lamp 116 of lasting light, utilize pulsed drive control to send the lamp 117 of intermittent light.

The LCD110 of present embodiment shown in Figure 49 (e) part, the optical illumination liquid crystal board 111 that obtains with mixing intermittent light and lasting light, thereby can obtain the image quality improvement effect that illustrates with the invention described above embodiment 1.

Present embodiment is not limit the type of non-light emitting-type pixel.That is, light guide plate 118 is configured in the display surface homonymy of LCD panel and by the forming of the illumination light of liquid crystal board generation light guide plate 118 outputs, also can obtains the effect identical with the LCD110 of present embodiment.

The LCD110 of present embodiment is formed among Figure 48, and lamp 116 and lamp 117 are arranged in a straight line, but may not be arranged in a straight line.

In sum, the LCD110 of present embodiment utilizes light guide plate 118 mixed characteristics different intermittent light and lasting lights mutually, as the illumination light of liquid crystal board 111.Therefore, the illumination light of the LCD110 of present embodiment changes and continues luminous component and luminous component at intermittence, so the device for video display of the illumination light of being mixed illumination can suppress the hangover of mobile object, the profile of clear display, the obstacle that glimmers can also be reduced, thereby high-quality demonstration video can be realized.

The LCD110 of present embodiment is divided into 2 groups with light source, carries out optical drive with different separately characteristics.Thereby, can driving circuit and driving power be set by lasting light special use or intermittent light special use, can simplify circuit and form, seek to reduce cost.Can also utilize separately circuit to control respectively that each is luminous, so the reliability of circuit is improved.

Among the commercially available LED, exist absolute maximum rated current when lighting continuously little, maximum rated current was little moment when pulse was lighted.The LCD110 of present embodiment can separately use the LED of lasting illuminating and the LED of illuminating at intermittence according to the electrical characteristics of this LED.

Embodiment 9

With Figure 50 another embodiment of the present invention is described.Among Figure 50, to having the identical reference number of member mark with the LCD identical functions of Figure 48.

As shown in figure 50, the device for video display 200 of present embodiment comprises power circuit (the 1st light source body driver part) 201, power circuit (the 2nd light source body driver part) 202, lamp (the 1st light source body) 205 and lamp (the 2nd light source body) 206.

The device for video display 200 of present embodiment has the power circuit 201,202 of 2 systems, and is installed separately the lamp 205,206 of 2 systems.That is, lamp 206 obtains power supply by line of electric force 204 from power circuit 202, thereby sends lasting light.On the other hand, the output of power circuit 201 is switched by switch 120, and the output after the switching is supplied with lamp 205 by line of electric force 230.Thereby lamp 205 sends intermittent light.

So the device for video display 200 of present embodiment is characterised in that, uses according to different principle of luminosity alights 205 and lamp 206.Particularly, lamp 205 carries out luminous according to the waveform shown in (d) part of Figure 38.206 on lamp carries out luminous according to the waveform shown in (c) part of Figure 38.

Therefore, the power circuit 202 of lamp 206 power supplies is always supplied with firm power to this lamp, do not apply the stress that load change causes fully.Otherwise, to lamp 205 power supply power circuit 201 break-make that repeats to power by switch 120, so produce load change.Therefore, can be optimized according to the load characteristic of power supply respectively each power circuit 201 and power circuit 202.Particularly, can improve power supplying efficiency and circuit reliability.

Lamp 206 can be by for example CCFL (Cold Cathode Fluorescent Light: the cold-cathode tube fluorescent light) constitute.The moment that CCFL lights the big electric current that circulates, make the sparking electrode deterioration, the lost of life, thereby be not suitable for intermittently lighting.Yet lamp 206 is often lighted, so can adopt the light-emitting component of the action that is not suitable for frequently repeating light on and off.

For example to adopt CCFL and to adopt the mode light source that principle of luminosity is different of lamp 205 to be used as lamp 205,206 o'clock in the lamp 206, both profiles, mounting means, driving voltage are different fully.Therefore, as shown in figure 50, each light source as stand-alone assembly, is installed to device for video display discretely in the mechanism, then mechanism design and insulating Design are easy, and also favourable aspect heat radiation.

In the device for video display 200 of present embodiment,, can obtain the identical effect of device for video display that illustrates with the invention described above embodiment 1 owing to will mix the light that obtains behind intermittent light and the lasting light as illumination light.That is, according to the device for video display 200 of present embodiment, the hangover that produces in the time of suppressing to show mobile object again shows this object by profile clearly, can reduce the obstacle that glimmers again.

The device for video display 200 of present embodiment is established to adopt and is used the other of light guide plate 118 to be illustrated according to the type back-lighting, even but the end of adopting 2 explanations of the invention described above embodiment penetrate the device for video display of type back-lighting, can use the means of illumination identical again with the device for video display 200 of present embodiment.

The device for video display 200 of present embodiment is configured in opposed end face in the light guide plate 118 with lamp 205 and lamp 206 respectively at Figure 50, but may not be limited to such configured light 205,206.

In sum, device for video display 200 according to present embodiment, use the different light source of principle of luminosity, and mixing is from the light of these light sources, the irradiation display board, thereby the hangover that produces in the time of simultaneously suppressing to show mobile object, by the mobile object of profile demonstration clearly, one side reduces the obstacle that glimmers.

The device for video display 200 of present embodiment is optimized power circuit easily owing to use the different light source of principle of luminosity.The impulse type of prior art is luminous to be difficult to adopt CCFL aspect reliability and life-span, but the device for video display 200 of present embodiment can be with CCFL as the light source that sends lasting light.

Embodiment 10

The liquid crystal indicator (LCD) of another embodiment of the present invention is described with Figure 51 and Figure 52.Among Figure 51, mark identical reference number to having with the member of Figure 48 identical functions.Shown in Figure 51, the LCD400 of present embodiment comprises power circuit 401, lamp (light source body) 402, timing generation circuit (intermittent light signal generator part) 403, reference voltage generating circuit (lasting light signal generator part) 404, adding circuit 405 and power amplification circuit 406.Reference voltage generating circuit 404 is made up of for example divider resistance and voltage buffer.

The feature of the LCD400 of present embodiment is: the gauge tap of lamp is not set, constitutes lamp 402 by a kind of light source, mix and intermittence luminous component and the lasting suitable signal of luminous component in electric mode, drive lamp 402.

Figure 52 is the sequential chart of running usefulness of the LCD400 of explanation present embodiment.(a) part of Figure 52 illustrates the waveform of vertical synchronizing signal 121, (b) part of Figure 52 illustrates the waveform of control signal (intermittent light signal) 407, (c) part of Figure 52 illustrates the waveform of control signal (lasting light signal) 408, Figure 52 (d) part illustrates the waveform of control signal (illumination light signal) 409, and (e) part of Figure 52 illustrates the waveform that makes the luminous power of lamp 402.

The control signal 407 of timing generation circuit 403 outputs of Figure 51 is not 2 value logical signals of single gauge tap break-make.That is to say that control signal 407 is the digital multi-valued signal of a plurality of intermediatenesses of expression or the simulating signal of representing continuous intermediateness.

Reference voltage generating circuit 404 outputs are as the control signal 408 of reference voltage, and are irrelevant with vertical synchronizing signal 121.This also is digital multi-valued signal or simulating signal.Adding circuit 405 is obtained control signal 407 and control signal 408 sums.Both sums output to power amplification circuit 406 as the control signal 409 of the luminosity of indication lamp 402.Power amplification circuit 406 is according to control signal 409, and the part power that power circuit 401 is supplied with outputs to lamp 402 as luminous power.

So the LCD400 of present embodiment is characterised in that, with synthetic each electric signal that is equivalent to continue luminous component and luminous component at intermittence of electric mode, drives lamp 402.Therefore, light the lamp 402 of whole Figure 51 with identical condition.So, comparing with the device for video display of embodiment 9 explanations with embodiment 8, the LCD400 of present embodiment has the advantage that is not easy to take place uneven luminance.

If the light source of the LCD400 of present embodiment is illustrated according to type for other, but the identical means of illumination of type light source LCD400 also available and present embodiment is penetrated at the 7 described ends of embodiment.Present embodiment is established and is constituted lamp with a kind of light source and be illustrated, but but also the signal that mixes of power mode drive a plurality of different types of light sources.

The electric signal ratio suitable with lasting luminous component and the suitable little and continuous situation of electrical signal amplitude of luminous component at intermittence of present embodiment have been described, but can have done like this.That is, the electric signal suitable with continuing luminous component can be with identical with electrical signal amplitude that intermittently luminous component is suitable, and also repeat break-make, with identical with electric signal that intermittently luminous component is suitable.So, available repetition frequency is that to be equivalent to about 3 times (for example 150 hertz) of vertical synchronizing signal or the time of lighting higher, lasting light the fluorescent lifetime of luminous component intermittently be about 1/10 or the signal of shorter time, by synchronous or asynchronous with vision signal, realization is equivalent to the on-off action of the signal of lasting luminous component.

That is to say, the pulse signals that carefully narrow and quantity is many can be continued the signal that luminous component is used as obtaining.This is that human eye can be regarded as just like low-light level is lighted continuously because the illumination light of the lamp of sort signal control is owing to be averaged narrow and many pulses.In the case, because be equivalent to intermittently luminous and to continue luminous both amplitude of electric signal identical, that can a shared part sends out that intermittent light uses lights and circuit that a lasting light is used.

In sum, in the present embodiment,, utilize the illumination light identical liquid crystal board 111 that throws light on the light that obtains after the illumination light of mixing different qualities by signal with the different illumination light of the synthetic control of circuit mode mutual characteristic.Therefore, the image quality improvement effect of the LCD400 of present embodiment is identical with the device for video display of the invention described above embodiment 1.That is,, can suppress the object hangover again, the profile of clear display according to the LCD400 of present embodiment.Reduce the obstacle that glimmers again.

And, according to the LCD400 of present embodiment,, can constitute optical system easily owing to constitute lamp with a kind of light source, and design easily.The LCD400 of present embodiment is again owing to utilize same narrow light illumination liquid crystal board 111, is not easy to take place display frame uneven luminance, colored irregular etc.

Embodiment 11

Illustrate that with Figure 53 to Figure 55 the luminescent waveform of the pulse of using two kinds of frequencies improves the effect of hangover amount and flicker amount when bringing.

Figure 53 (a) part illustrates the luminescent waveform that the pixel of device for video display of the present invention can be used.The pulse A that represents with oblique line is equivalent to the 1st luminous component (with reference to figure 2), and its duty factor is D%, and luminous strength ratio is S3%.

Present embodiment is characterised in that, the luminescent waveform that is equivalent to the 2nd luminous component is the set of the pulse B that represents with mesh point.The frequency of pulse B (inverse of the t0 among the figure) is higher than the frequency of video signal displayed, for example is 150 hertz, is not subjected to tracing of human eye, thus Figure 53 (a) part shown in luminescent waveform be equivalent to Figure 53 (b) part shown in luminescent waveform.

Figure 53 (a) part is in that (time of 100-D) % produces 4 subpulse B, thereby the luminous intensity of 1 pulse B is (100-S3)/4%.The vertical synchronizing signal of pulse A and vision signal is synchronous, but pulse B and vertical synchronizing signal can be synchronous, also can be asynchronous.

The figure of the effect that reduces the hangover amount when Figure 54 is the luminescent waveform that illustrates shown in (a) part of using Figure 53.Figure 54 imagination is by adopting for example such non-light emitting-type display board of liquid crystal board, and the luminescent waveform that makes light source improves hangover for the waveform shown in (a) part of Figure 53.

Figure 54 is identical with the model of Fig. 4 explanation, and its situation also is that the long object of 3 pixels moves with the direction of each frame 1 pixel constant speed toward screen.The product of the pixel transmission rate shown in (b) part of the luminescent waveform of the light source shown in Figure 54 (a) part and Figure 54 is the brightness of (c) mobile object shown in partly of Figure 54.Under this state, after supposing to deceive the No.1 direction of direction of arrow among the figure, carry out integral operation toward the black No.1 direction of arrow corresponding to the human eye integration.Consequently Figure 54 (d) part and (e) part of Figure 54.

Shown in (e) part of Figure 54, the brightness waveform of mobile object comprises ladder 1,3 and oblique line 2.People's dynamic visual acuity is difficult to discern ladder 1,3, thereby human eye mainly is identified as oblique line 2 hangover of object.If object is static, then ladder 1,3 disappears, so even if also do not perceive ladder with static eyesight.Therefore, after object stops also available with stop before identical luminescent waveform continue to light back-lighting.

Figure 55 (a)～Figure 55 (c) illustrates the luminescent waveform shown in (a) part of Figure 54 and the fourier series result of calculation of the luminescent waveform of prior art.Among Figure 55 (a) and Figure 55 (b), set for both sides' luminosity identical.Brightness is identical, and then the DC component during Fourier transform is identical, can do the comparison of higher hamonic wave.Shown in Figure 55 (c), 1 subharmonic of the luminescent waveform of present embodiment and existing example is respectively 0.82 and 1.28.Mean that present embodiment reduces flicker than existing example.

Utilize the luminous of control light source, when realizing present embodiment, can adopt for example such light source of LED.The electric current that the luminous paired pulses shape of LED switches is made high-speed response, if thereby supply with the current waveform shown in (a) part of LED Figure 53, just can make LED luminous by the waveform identical with current waveform.

In sum, utilize the luminescent waveform shown in (a) part of Figure 53 also can suppress the obstacle of live image profile again, glimmer again.

Embodiment 12

The device for video display of another embodiment of the present invention is described with Figure 56 to Figure 59.In the device for video display of present embodiment, display board is that active array type drives and self luminous EL (electroluminescence) device.EL element circulation by each pixel arrangement meets the electric current of image information, control luminous bright dark, the generation display image.

Figure 56 is the figure of composition that the EL pixel of present embodiment is shown.EL pixel 601 comprises scan electrode 602, signal electrode 603, TFT604, capacitor 605, TFT606, TFT607, TFT608, EL element 609, power supply 610, scan electrode 611.For example during the TSC-system vision signal, there are 525 scan electrodes 602 in the display board.The vertical frequency of TSC-system vision signal is 60 hertz, and sweep trace is 525, thereby selects scan electrode 602 every about 32 microseconds (=1/60/525).Scan electrode is arranged toward the horizontal direction of display board, and is shared with other pixel.

Supply with the image information that shows from signal electrode 603.For example the TSC-system vision signal then exists 640 or 720 signal electrodes 603 in the display board 60.Signal electrode 603 is arranged toward the vertical direction of display board, and is shared with other pixel.The scan electrode 602 of the pixel of select paying close attention to and when supplying with pulse, the TFT604 conducting.Owing to regularly signal electrode 603 is supplied with image informations according to this, with the form of voltage (or electric charge) with this information stores at capacitor 605.Concerned pixel is the non-selection phase, then TFT604 blocking-up, the voltage of maintenance capacitor 605.The electric current that EL element 609 determines by the voltage that keeps from this capacitor 605 of power supply 610 circulations, luminous with the brightness of hope.Here, there are 2 systems to EL element 609 supplying electric currents in the EL pixel 601 of present embodiment.That is, system by TFT606 and the system by TFT607.Utilization is by the TFT608 control TFT607 break-make of scan electrode 611 controls.

Figure 57 is the figure of the running usefulness of explanation EL pixel 601.(a) part of Figure 57 illustrates the waveform of the pulse signal of supplying with scan electrode 602.Repetition period T is 16.7 milliseconds (=1/60) in the TSC-system vision signal.(b) part of Figure 57 illustrates the waveform of the pulse signal of scan electrode 611.Figure 57 (c) part illustrates the waveform of electric current of the drain electrode circulation of TFT606.This electric current is supplied with from power supply 610, and the source electrode-drain electrode by TFT606 flows to EL element.Scan electrode 602 be " height " during, the voltage between terminals of capacitor 605 is upgraded in the TFT604 conducting, thereby this electric current is changed.For example the common liquid crystals response speed is fast for the response ratio of EL element, supposes to change to during scan electrode 602 is for " height " electric current of hope.

Shown in (c) part of Figure 57, set bigger electric current I 1 in certain cycle, make pixel luminous bright.In the cycle of the following little electric current I 2 that circulates, make EL pixel 609 luminous dark.Another system is the electric current of supplying with from power supply 610 by TFT607.The amplitude of this electric current is identical with the system of TFT606, and also the voltage by capacitor 605 determines.Therefore, Figure 57 (c) part and (d) part in, I1=I3, I2=I4.

But TFT607 is utilizing difference aspect scan electrode 611 controls.The pulse of scan electrode 611 be " height " during, the TFT608 conducting.At this moment, the grid of TFT607 and the voltage between the source electrode are 0, thereby the TFT607 blocking-up.Scan electrode 611 be " low " during, TFT608 blocking-up, at this moment TFT607 is controlled by the voltage between terminals of capacitor 605, circulating current like that shown in (d) part of Figure 57.

The electric current of circulation is shown in Figure 57 (e) part in the EL element 609, and it is the waveform shown in Figure 57 (c) part and (d) the waveform sum shown in the part.That is, I5=I1, I6=I1+I3.I7＝I2，I8＝I2+I4。

EL element 609 is carried out luminous according to the current waveform of (e) part of Figure 57.Luminescent waveform depends on the electric current-characteristics of luminescence of EL element, if but establish characteristic here and have proportional relation, then luminescent waveform is equal to (f) part of Figure 38.Luminous by being undertaken by this waveform, obtain the effect of improving hangover amount and flicker amount when illustrating together with Fig. 7 as the invention described above embodiment 1.

Illustrated as mentioned, the device for video display of present embodiment is the autoluminescence EL plate of for example driven with active matrix.Have 2 TFT by capacitor 605 controls of store video information, respectively at different timing circulating currents, thus the generation luminescent waveform corresponding with intermittent light and lasting light.That is luminous the 1st luminous component and the 2nd luminous component that illustrates together with Fig. 2 that comprise of pixel.Perhaps pixel luminous comprises intermittently luminous component and continues luminous component.

By the management of the impulse phase of scan electrode 611 luminous phase place is intermittently controlled.Can be according to the phase place of phase control the 1st luminous component of scan electrode 611.Can compare D according to " low " phase control load of scan electrode 611.When wishing the luminous energy (being luminous intensity) of increasing luminous component at intermittence or the 1st luminous component, duty factor D is increased.

The EL plate luminous with existing maintenance is identical, the selection running time of scan electrode 602 also can be 1/60 second, thereby needn't make scan electrode driver (not shown) and signal electrode driver (not shown) high speed, needn't externally use the frame memory of stored video signal etc., carry out clock rate conversion etc.Capacitor can be 1, and is also identical with the luminous EL plate of existing maintenance.

Figure 58 be the explanation EL element another form the figure of routine usefulness.Among Figure 58, to marking identical symbol with the part of Figure 56 equalization.EL pixel 701 among Figure 58 comprises capacitor 702, capacitor 703, TFT

704, TFT705, TFT706, scan electrode 707, scan electrode 708.When selecting pixel, the TFT604 conducting writes capacitor with the voltage corresponding with video information, but series capacitors 702 and capacitor 703 are write this voltage.

Make TFT705 and TFT706 repeat alternately break-make, switch source electrode-grid voltage of TFT704.In TFT705 conduction period and TFT706 conduction period, the voltage of capacitor 703 and capacitor 703 and the voltage between terminals sum of capacitor 702 become source electrode-grid voltage of TFT704 respectively.Utilize these 2 grid voltages to switch the electric current of EL element 609.TFT706 is subjected to scan electrode 707 controls.TFT705 is subjected to scan electrode 708 controls.Also can make to have phase inverter in the pixel, the signal that for example makes the logical inversion of scan electrode 707 is input to the grid of TFT705.

Figure 59 is the figure of the running usefulness of explanation EL element 701.(a) part of Figure 59 illustrates the amplitude of the pulse signal of supplying with scan electrode 602.(b) part of Figure 59 illustrates the amplitude of the pulse signal of scan electrode 705, and (c) part of Figure 59 illustrates the amplitude of the pulse signal of scan electrode 706.(d) part of Figure 59 illustrates the current amplitude of the EL element 609 of TFT705 control.Scan electrode 708 be " height " during, the TFT705 conducting is by grid-voltage between source electrodes of the terminal voltage of capacitor 703 regulation TFT704.

This voltage is the voltage that obtains after the voltage dividing potential drop that writes in the time of will selecting pixel with capacitor 703 and capacitor 702.If the voltage that writes when selecting is V, the static capacity of capacitor 702 and capacitor 703 be respectively C1, C2 then the terminal voltage V2 of capacitor 703 be shown in the following formula.

V2＝V*(C1*C2/C1+C2)

(e) part of Figure 59 illustrates the current amplitude of the EL element 609 of TFT706 control.Scan electrode 707 be " height " during, the TFT706 conducting, grid-voltage between source electrodes of TFT704 becomes the voltage V that writes when selecting pixel.V and V2 are V2＜V, if grid-voltage between source electrodes of hypothesis TFT704 is directly proportional with the drain current of TFT704, then the electric current I 13 shown in (e) part of electric current I 11, I12 and the Figure 59 shown in Figure 59 (d) part, the pass of I14 are shown in the following formula.

I11＝I13*(C1*C2/C1+C2)

I12＝I14*(C1*C2/C1+C2)

Figure 59 (f) part illustrates the waveform of the electric current of actual circulation EL element 609, is the waveform of (d) part of Figure 59 and (e) the waveform sum of part.If the electric current of EL element 609-luminosity characteristic is linear, then the luminosity waveform of EL element 609 be (f) waveform shown in partly of Figure 59.That is luminous the 1st luminous component and the 2nd luminous component that comprises Fig. 2 explanation of pixel.Perhaps comprise intermittently luminous component and lasting luminous component.Utilize this waveform, can realize the hangover amount of embodiment 1 explanation and the improvement that flicker is measured both.The luminous phase place and the duty factor D that manage the 1st luminous component with the impulse phase of scan electrode 707,708 control.When wishing that the luminous energy (being luminous intensity) of the 1st luminous component is big, the capacity ratio of capacitors available 702,703 is controlled." low " phase of scan electrode 707 is increased, " height " phase of scan electrode 708 is reduced.

In sum, as with Figure 58 and Figure 59 explanation, the device for video display of another embodiment of the present invention uses the video information of capacitor stores in the mode of dividing potential drop.The luminous EL plate of the selection of scan electrode 602 running time and existing maintenance is identical, it also is 1/60 second, thereby needn't make scan electrode driver (not shown) and signal electrode driver (not shown) high speed, needn't externally use the frame memory of stored video signal etc., carry out clock rate conversion etc.

Embodiment 13

The device for video display of another embodiment of the present invention is described with Figure 60.In the device for video display of present embodiment, display board is that active array type drives and self luminous EL (electroluminescence) plate or active array type drive non-luminous liquid crystal board.In the present embodiment, by the EL element of each pixel arrangement or liquid crystal cell are supplied with the voltage that meets image information, control luminous bright dark, the generation image.

Figure 60 is the figure of timing of running of the device for video display of explanation present embodiment.For illustrative ease, the sweep trace of supposing display board is 5.(a) part of Figure 60 illustrates the waveform of vertical synchronizing signal, is the benchmark that picture repeats.The TSC-system vision signal, then the frequency of vertical synchronizing signal is 60 hertz.(b) part of Figure 60 illustrates the waveform of horizontal-drive signal.Suppose that sweep trace is 5,1 vertical cycle produces 5 subpulses of H11 to H15.(c) part of Figure 60 illustrates the waveform of data-signal, supplies with signal to 1 in many single data electrode of arranging toward the display board horizontal direction.

Here, the device for video display of present embodiment has the frame memory of stored video signal separately with frame unit, by visiting the view data of this frame memory storage, carries out data staggered toward the time shaft direction.Here, the pixel that is positioned on the same data electrode is distributed 1 to 5 number by putting in order of vertical direction, making the pixel that is positioned at the screen topmost is pixel 1, and the pixel that is in its below is a pixel 2.Then, the video data that pixel 1 is shown is taken as D1, and the video data that pixel 2 shows is taken as D2.D11, D12, D13, its implication is: D1 is divided into 3 and at the staggered video data of time-axis direction.

Shown in Figure 60 (c) part, for example the data of pixel 1 usefulness are then carried out time interleaving, make first the generations D11 during the H11, and the 2nd of H13 produces D12, the 3rd the generation D13 of H14.Suppose input 100% white level (8,255 grades) among the D1 of certain frame, input 60% ash level (8,150 grades) in the next frame after 1/60 second.

The division of view data is determined by duty factor D, luminous strength ratio S.For example suppose duty factor D=50%, luminous strength ratio S=80%.Establishing the instantaneous peak brightness that the pixel of device for video display can be luminous again is 1000 nits.The white signal of D1=100%, then the 1st of Fig. 2 explanation the luminous instantaneous light emission brightness (height of the 1st luminous longitudinal axis) is 100%, i.e. 1000 nits.The 2nd luminous luminous strength ratio S is 20%, and the instantaneous light emission brightness of Fig. 2 (height of the 2nd luminous longitudinal axis) is 25%, i.e. 250 nits.Calculate by 250 nits=1000 nit *, 50%/80%*20%.50%, 80%, 20% numerical value is equivalent to D, S, the 100-S of Fig. 2 respectively.

Like this, the calculating with duty factor D and luminous strength ratio S decision determines D11, D12, D13 from D1.Divide and also to set video data, make 100% white signal carry out luminous with the instantaneous light emission brightness of D11=25%, D12=100%, D13=25%.Suppose that video data and luminosity are proportional relation, in other words, video data is 8 when long, being divided into of 255 grades white signal: D11=64 level, D12=255 level, D13=64 level.According to these instantaneous light emission brightness and duty factor 50%, average screen brightness is the 1000*0.5+250*0.5=625 nit.

Under the situation of the gray level of D1=60%, form 60% value with the value of white signal explanation.That is, if D1=60%, then D11=15%, D12=60%, D13=15%.If D11, D12, each self-corresponding brightness of D13 are L11, L12, L13, if 100% instantaneous light emission brightness is 1000 nits, L11=150 nit then, L12=600 nit, L13=150 nit.

(d) part of Figure 60 illustrates the waveform of the pulse signal that the scan electrode that scans 1 pixel is applied.Suppose that pixel 1 is in screen top.Suppose that sweep trace is 5, and suppose to exist on the same data electrode 5 pixels.Suppose that described vision signal D1 is the video data that this pixel 1 shows.

Sweep signal produces 3 subpulses at 1 vertical cycle.This pulse is time of about 1/3 of horizontal cycle.1 vertical cycle produces 3 times pulse respectively to horizontal-drive signal generation phase deviation.The phase place of time orientation division and the video data D11, the D12 that interlock, D13 is corresponding with the phase place of sweep signal during " height " of pixel 1.That is, by the video data of pixel 1 staggered on the time orientation being input to pixel 1 with sweep signal, determined pixel 1 luminous.

In the waveform of (d) part of Figure 60, the 1st pulse that begins from a left side is positioned at the first half of horizontal-drive signal, and the 2nd pulse is positioned at the center, and the 3rd pulse is positioned at latter half.(e) part of Figure 60 is the luminescent waveform of pixel 1.The longitudinal axis is brightness.Suppose it is the white signal of D1=100% (255 grades).During the 1st " height " of sweep signal, pixel 1 is set at luminance (luminosity) L11 of D11 decision.At this moment instantaneous light emission brightness is 250 nits in above-mentioned example.The time point that drops to " low " in sweep signal keeps these data D11, thereby pixel 1 continues luminous with 250 nits.Then during the 2nd " height ", the pixel data of pixel 1 is write D12.In the above-mentioned example, the L12=1000 nit.Then, sweep signal drops to " low " once more, thereby keeps D12, and pixel 1 continues luminous with 1000 nits.Equally, in the 3rd scanning impulse, write and keep being equivalent to the L13=250 nit of D13.In a word, in the present embodiment, be the timing of " height " according to sweep signal of Figure 60 (d) part, setting is equivalent to the luminosity of video data of (c) partial data signal of Figure 60.

For example, if be EL element, the voltage of then video data being used as capacitor is kept, and circulation is equivalent to the electric current of this voltage in EL element, makes EL element luminous.If liquid crystal cell then is used as video data as electric charge and kept, and liquid crystal is modulated into the transmissivity that matches with this electric charge.

L11, the L12 of (c) part of Figure 60, L13 be L11=L13 and L12 for example〉L11.Luminous by being undertaken by this waveform, Fig. 7 explanation that obtains embodiment 1 time improves the effect of hangover amount and flicker amount.The duty factor D of the 1st luminous component of Fig. 2 explanation is by the impulse phase decision of the sweep signal of the alternation sum correspondence of data-signal.Division methods (ratio) decision that luminous strength ratio S is divided by the video data of D11, D12, D13.Figure 60 (f) part and (g) part the situation of concern as the pixel 3 of another pixel is shown.Division is written to the video data that obtains behind the video data D3 that pixel 3 shows is expressed as D31, D32, D33.And, the luminosity corresponding with each data is taken as L31, L32, L33.

Pixel 3 is in center Screen.The work timing of this pixel is identical with pixel 1 basically, and phase place then is offset 2 row.Therefore, the sweep signal of each pixel is not " height " simultaneously.

Like this, the device for video display of present embodiment will be applied to the data interlace on the data electrode in advance, be processed into 3 data of each horizontal cycle configuration.And, the sweep signal of carrying out the selection of vertical direction, 3 " height " signals of each vertical synchronizing signal output.A plurality of sweep signals do not form " height " simultaneously.

By writing data by such timing, the device for video display of present embodiment is obtained the luminescent waveform shown in (e) part of Figure 60.This luminescent waveform comprises the 1st luminous component shown in Figure 2 and the 2nd luminous component.Perhaps comprise intermittently luminous component and lasting luminous component.By making pixel luminous, implement the ideal of hangover amount and flicker amount and improve by this waveform.

In the present embodiment, because by storer externally being set with data interlace, the control luminescent waveform needn't for example add scan electrode etc., upgrade the pixel of the general composition change display board of 1 secondary data from each vertical synchronizing signal and form, can continue to use existing display board.

And the intermittently duty factor of luminous component is controlled in the staggered management of data available signal.Intermittently the luminous phase place of luminous component too the staggered management of data available signal control.

Embodiment 14

The device for video display of one embodiment of the present invention is described with Figure 61 to Figure 74.Figure 61 is the figure of pixel luminescent waveform of the device for video display of explanation one embodiment of the present invention.The luminescent waveform of the 1 cycle share of the vertical cycle T of video signal displayed shown in Figure 61.

(a) part of Figure 61 and (b) part of Figure 61 illustrate identical waveform, but the division methods difference of luminescent waveform.That is, Figure 61 (a) part is pressed big part of instantaneous light emission intensity and other parts division waveform.

In (a) part of Figure 61, the part shown in the mesh point is the 1st luminous component.The work of this 1st luminous component is D% for the duty factor of the fluorescent lifetime of vertical cycle T, instantaneous light emission intensity is the A nit, luminous strength ratio with respect to the pixel luminous intensity is S%, vertical cycle begin the back, to the data at luminescent waveform center be P% to the ratio of vertical cycle.

Here, be called peak luminous value, luminescence peak, instantaneous light emission brightness, instantaneous light emission intensity, instantaneous light emission peak and only be called brightness the pixel of certain time is luminous.Strict, what be called brightness generally is instantaneous light emission brightness, and unit is nit (nit) or candela/metre2 (cd/m ²).Human eye perceives to be eyes carry out integration, brightness after level and smooth to instantaneous light emission brightness, be referred to as mean flow rate, average screen brightness, screen intensity, mean intensity, average level.Strict.Unit is not a nit, and nit unit is used in the most cases equivalence.Mean flow rate when for example LCD TV uses demonstration white in the products catalogue standard.S shown in Figure 61 and S1 are called luminous strength ratio (or luminous intensity), luminous component, luminous quantity to what instantaneous light emission brightness and time ratio (or time) multiplied each other like that.Among Figure 61, the area that surrounds with the longitudinal axis and transverse axis of luminescent waveform is equivalent to luminous intensity.

In (b) part of Figure 61, the part of representing with oblique line is the 2nd luminous component.The duty factor of the fluorescent lifetime of this 2nd luminous component is that (100-D) %, instantaneous light emission intensity are the B nit to DA+DB=, are (100-S) % with respect to the luminous strength ratio of the luminous intensity of pixel.

For the 1st luminous component and the 2nd luminous component, have A〉relation of B.DA be from vertical cycle begin back (promptly from based on the pixel selection pulse (grid impulse, scanning impulse) of vertical synchronizing signal back), data till beginning to light to the 1st luminous component are to the ratio of vertical cycle.DB be light from the 1st luminous component finish the back, the time till finishing to vertical cycle is to the ratio of vertical cycle.

(b) of Figure 61 is partly by intermittently luminous component and totally carrying out luminous and improving the brightness calculation except that this component continue luminous component division waveform.In (b) part of Figure 61, the zone of representing with vertical line is a luminous component at intermittence.Close the luminous component of during the period having a rest, its duty factor with respect to the fluorescent lifetime of period T is D%, instantaneous light emission intensity is the C nit, luminous strength ratio with respect to the luminous intensity of the pixel that shows in the vertical cycle is S1%, from vertical cycle begin the back, to time of luminescent center be P% to the ratio in this cycle.Instantaneous light emission intensity C has the relation of C=A-B.

In (b) part of Figure 61, the zone of representing with cross hatch is lasting luminous component.About continuing luminous component, the duty factor of its fluorescent lifetime is 100%, and instantaneous light emission intensity is the B nit, is (100-S1) % with respect to the luminous strength ratio of the luminous intensity of the pixel that shows in the vertical cycle.

Here, S1=C*D=(the * D of A-B).And, A=S/D, B=(100-S)/(100-D).Therefore, form S1=S-(100-S)/(100-D) * D can be with the S1 S that converts.That is, can think that the luminescent waveform that the 1st luminous component and the 2nd luminous component form equals to comprise intermittently luminous component and the luminescent waveform that continues luminous component in fact.Therefore, in the following explanation, effect of the present invention is described according to Figure 61 (b) part.

Figure 62 is the block diagram of composition that the device for video display 1100 of embodiment of the present invention 14 is shown.As shown in the drawing, device for video display 1100 comprises display board 1101, Video Controller 1102, gate drivers 1103, scanner driver 1104, row electrode 1105, column electrode 1106, lamp drive circuit 1107, lamp drive circuit 1108.Lamp 1109, lamp 1110.

The row electrode 1105 of row shape and the column electrode 1106 of the shape of aligning are lined up in configuration on display board 1101.Display board 1101 is that the transmission-type from the illumination light of light source is also modulated in transmission.A plurality of pixels (not shown) formation is rectangular at row electrode 1105 with the intersection point of column electrode 1106.

For example display board 1101 is made of the liquid crystal of quick response.Here, the response of liquid crystal is approximately exponential function, when being used as y=A0* (1-exp (t/ τ)) (wherein y is a transmissivity, and A0 is an arbitrary constant), suppose that this timeconstant (reaching the time of about 63% end value from response beginning to response) is about 1 millisecond, even if maximum also is 2 milliseconds.

Gate drivers 1103 drives pixel according to data-signal 1112, the transmissivity of pixel is set at the state of data-signal 1112 decisions.Sweep signal 1113 has the horizontal-drive signal and the vertical synchronizing signal of vision signal 1111.Horizontal-drive signal is the unit of display of the column direction (horizontal direction) of display frame.Vertical synchronizing signal is the unit of display of the line direction (vertical direction) of screen.Vertical synchronizing signal is 60 hertz in TSC-system vision signal for example.

Scanner driver 1104 is selected to the bottom from the top of screen and scan line electrode 1106 successively according to the timing of the horizontal-drive signal of sweep signal 1113.According to the timing of the vertical synchronizing signal of sweep signal 1113, the column electrode of selecting 1106 is reset into the top of screen.

When paying close attention to certain pixel on the display board 1101, the cycle of selecting this pixel is 16.7 milliseconds.Video Controller 1102 produces lamp control signal 1114 according to the vertical synchronizing signal of vision signal 1111, outputs to lamp drive circuit 1107.Lamp drive circuit 1107 control lamps 1109.The luminous output of lamp 1109 is the luminous light at intermittence (intermittently luminous component) 1115 of lamp control signal 1114 controls.That is, lamp 1109 be equivalent to Figure 61 (b) part explanation intermittence luminous component luminous.Lamp 1109 can be realized with for example single or multiple LED (light emitting diode).Luminous optical illumination display board 1101 intermittently.

Lamp drive circuit 1108 control lamps 1110.The luminous output of lamp 1110 is to continue luminous light (continuing luminous component) 1116, and is irrelevant with vision signal 1111.That is, lamp 1110 is equivalent to lasting luminous component luminous shown in (b) part of Figure 61.Lamp 1110 can be realized with the such fluorescent light of for example single or multiple CCFL (cold-cathode tube).Perhaps identical with lamp 1109, also available LED realizes.It is identical to continue luminous light 1116 and intermittence luminous light 1115, and display board 1101 also throws light on.

Figure 63 is the cut-open view of the device for video display 1100 of Figure 62.Among Figure 63, mark identical symbol to having with the part of Figure 62 identical functions.Shown in Figure 63, leaded light space 1201 is the housing backboard of for example device for video display 1100 and the gap between the display board 1101.At the bottom in leaded light space 1201 configured light 1109, lamp 1110.The top in leaded light space 1201 then disposes display board 1101.

Luminous light 1115 and propagate toward display board 1101 in the inside in leaded light space 1201 as the lasting luminous light 1116 of the output of lamp 1110 at intermittence as the output of lamp 1109 in this process mixes two illumination light, forms mixed lighting light 1202.Then, mixed lighting light 1202 illumination display boards 1101 are after this illumination light is subjected to the pixel modulation of display board 1101, as showing that visualization light 1203 is from display board 1101 outputs.The observer who observes device for video display 1100 should show that visualization light 1203 was identified as the demonstration video.

Figure 64 is the sequential chart of the running usefulness of the device for video display 1100 shown in explanation Figure 62 and Figure 63, and the time that the luminescent waveform of the signal propagated on each path and light is shown changes.Transverse axis is the time, and time shaft is a unit description with the frame of vision signal.Frame is meant the unit of the display frame of vision signal 1111, is determined by vertical synchronization.

(a) part of Figure 64 illustrates the signal waveform of the vertical synchronizing signal of vision signal 1111.(b) part of Figure 64 illustrates the signal waveform of lamp control signal 1114, distinguishes that lamp control signal 1114 and vertical synchronizing signal synchronously repeat break-make.Figure 64 (c) part illustrates the intermittently luminescent waveform of luminous light 1115, and synchronously to carry out intermittence luminous with vertical synchronizing signal.The longitudinal axis is represented instantaneous light emission intensity.

(d) part of Figure 64 illustrates the luminescent waveform that continues luminous light 1116, and is irrelevant with vertical synchronizing signal, always is constant.The longitudinal axis is instantaneous light emission brightness.(e) part of Figure 64 illustrates the luminescent waveform of mixed lighting light 1202.The longitudinal axis is instantaneous light emission brightness.The light that mixed lighting light 1202 obtains behind lasting luminous light 1116 of (d) part of the intermittence of leaded light space 1201 mixing Figure 64 (c) parts luminous light 1115 and Figure 64.

The transmissivity of this pixel when (f) part of Figure 64 illustrates certain pixel of paying close attention to display board 1101.(f) part of Figure 64 also illustrates the state of importing the blackout picture in the 2nd and the 4th frame in the white video of input, the 1st and the 3rd frame.The product of the transmissivity of the pixel shown in (f) part of the mixed lighting light 1202 shown in Figure 64 (e) part and Figure 64 be (g) demonstration visualization light 1203 shown in partly of Figure 64, i.e. waveform time response of the instantaneous light emission brightness of display image.

So the device for video display 1100 of present embodiment is characterised in that to have lamp 1109 and lamp 1110 these a plurality of light sources, each light source is exported intermittently luminous light 1115 respectively and is continued luminous light 1116, with the mixed light illumination display board 1101 of these luminous light.Intermittently luminous light 1115 and lasting luminous light 1116 mix in leaded light space 1201.Synchronously control the intermittently luminous repetition period and the phase place of luminous light 1115 with the vertical synchronizing signal of vision signal 1111.

So the device for video display 1100 of present embodiment can be realized improving live image hangover amount simultaneously and reduce the obstacle that glimmers by with the mixed lighting light 1202 illumination display boards shown in (g) part of Figure 64.

Figure 65 is the figure of the lofty Kazakhstan of improvement of the device for video display 1100 of the qualitative explanation present embodiment running usefulness that reduces to glimmer.Among Figure 65, suppose object, and its moving direction is that the screen top is to the below with each frame 1 pixel constant speed movement.The longitudinal length of the scale of object is 3 pixels, and lateral length is any.

(a) part of Figure 65 illustrates the luminescent waveform of mixed lighting light 1202, and the longitudinal axis is instantaneous light emission brightness, and transverse axis is frame unit's (time).The part of representing with nicking in (a) part of Figure 65 is the component of luminous light 1115 at intermittence.The part of representing with cross hatch in (a) part of Figure 65 is for continuing the component of luminous light 1116.

The mobiles that (b) part of Figure 65 illustrates demonstration on the display board 1101 is at certain profile in a flash, and transverse axis is pixel unit (space), and the longitudinal axis is a transmissivity.

(c) part of Figure 65 illustrates the situation (transverse axis is the time, and the longitudinal axis is the space) that mobiles moves in the display frame of display board 1102.The display frame of display board 1101 is 2 dimensional planes originally, but Figure 65 (c) part is omitted a horizontal axis in 2 solid axes.

The mobiles that shows in time process and move, but, show that visualization light 1203 forms 2 kinds of brightness according to this relation that moves the illumination that the luminescent waveform with (a) part of Figure 65 causes.That is, intermittently luminous component carry out luminous during, show that the brightness of visualization light 1203 is big.The part of representing with nicking in (c) part of Figure 65 is equivalent to brightness and becomes big part.

On the other hand, during the lasting luminous component that only throws light on,, has the intensity of adequate illumination pixel as far as possible though the luminous intensity of mixed lighting light 1202 is little.The part of representing with cross hatch in Figure 65 (c) part is equivalent to only to continue during luminous component throws light on.

The observer during with the eye tracking mobiles, because these two kinds of luminances multiply each other, forms state of (d) part of Figure 65 along arrow No.1 2, mirrors observer's nethike embrane.(e) part of Figure 65 illustrates the profile of (d) brightness partly of Figure 65.In (e) part of Figure 65, transverse axis remarked pixel (space), the longitudinal axis is represented brightness.

Shown in (e) part of Figure 65, the luminance contour of the mobiles of observer's identification has 3 kinds of oblique lines, and promptly oblique line 1,2,3.Here importantly oblique line 1 and the oblique line 3 shown in Figure 65 (e) part is mild, but oblique line 2 rises steeply slope drastic change.

Human eye is difficult to discern the brightness corresponding with mild slope 1 and slope 3 to be changed.Its reason is that the observer is poor to this recognition capability that the contrast recognition capability of mobile object is generally compared the conventional stationary object.Therefore, the luminance contour of distinguishing the object that the observer discerns only is oblique line 2, for the live image hangover with respect to constant luminous light source illumination of time display board 1101 time shown in Figure 114 (a) part, the device for video display 1100 of present embodiment can fully be finished and improve hangover.

Figure 66 (a)～Figure 66 (i) is the figure that illustrates that quantitatively the effect of present embodiment is used, and 3 kinds of light-emitting modes are shown.

The characteristic of luminosity waveform, hangover amount and flicker amount when here, Figure 66 (a)～Figure 66 (c) illustrates working load than the existing type impulse type light-emitting mode that is 25%.The characteristic of luminosity waveform, hangover amount and flicker amount when Figure 66 (d)～Figure 66 (f) illustrates working load than 40% impulse type light-emitting mode.The characteristic of luminosity waveform, hangover amount and flicker amount when Figure 66 (g)～Figure 66 (i) illustrates the device for video display 1100 illumination display boards 1101 that use present embodiment.In the device for video display 1100 of present embodiment luminous, the duty factor D of luminous component intermittently is set at 20%, intermittently the luminous strength ratio S1 of luminous component is set at 80%.

About the hangover amount, its unit is the length on the space, and the variation of the brightness from 10% to 90% of the longitudinal axis is defined as the hangover amount.Low according to above-mentioned human eye to the sensitivity of the contrast of mobiles, stipulate this definition.The No.1 scope of arrow among Figure 66 (b), Figure 66 (e) and Figure 66 (h) is with respect to this hangover amount.

Figure 66 (c), Figure 66 (f) and Figure 66 (i) illustrate the flicker amount.This flicker amount with Fourier transform respectively to the luminescent waveform working frequency conversion shown in Figure 66 (a), Figure 66 (d) and Figure 66 (g) and calculate 1 order harmonic components the ratio of 0 DC component (mean value) is obtained.When for example vertical synchronizing signal was 60 hertz a TSC-system vision signal, 1 subharmonic was 60 hertz.1 order harmonic components with respect to 0 order harmonic components is big more, and the flicker obstacle is big more.

Here, among Figure 66 (a)～Figure 66 (i), take into account and make the luminous intensity of each light-emitting mode identical.That is, among Figure 66 (a), Figure 66 (d) and Figure 66 (g), identical to the brightness principal value of integral by the time.Owing to make luminous intensity identical like this, the energy of each mean value component (0 DC component) of Figure 66 (c), Figure 66 (f) and Figure 66 (i) is identical in each light-emitting mode.1 order harmonic components that therefore, can compare each light-emitting mode.

Figure 67 is the figure that concludes the characteristic of each light-emitting mode shown in Figure 66 (a)～Figure 66 (i).Among Figure 67, the 1st row intermittence luminous component duty factor D be with respect to pixel upgrade the repetition time (vertical cycle) intermittence luminous component the fluorescent lifetime ratio.The 2nd row lasting component be with respect to total luminous intensity intermittence luminous component luminous strength ratio S1.In prior art luminous, intermittently the luminous strength ratio S1 of luminous component is 100%.The hangover amount of the 3rd row is the length of the No.1 line of arrow shown in Figure 66 (b), Figure 66 (e) and Figure 66 (h).The flicker amount of the 4th row is meant the ratio of 60 hertz of components (1 subharmonic) to mean value (0 DC component).The of Figure 67 walks to the light-emitting mode 1 to 3 that the 3rd row corresponds respectively to each Figure 66.

Shown in Figure 114 (a) part, do not have under the luminous situation of hangover countermeasure, be 0.8 with respect to the hangover amount of 10% to 90% variation of brightness.Compare therewith, the duty factor of the existing example of the 1st row of Figure 67 is 25%, and the improvement of hangover amount reaches 0.2.Therefore, in the existing example of the 1st row, hangover amount improvement rate is 75%.Yet the ratio with 90% produces 60 hertz of components as the main cause of flicker, forms significant obstacle.

Here, shown in the 2nd existing example of going of Figure 67,, establish duty factor is increased to 40% in order to reduce flicker.Can utilize the increase duty factor that the flicker amount is suppressed to 75%, but the hangover amount is increased to 0.32, makes hangover amount improvement rate be reduced to 60%.

The 3rd the row present embodiment in, as feature of the present invention intermittence luminous component duty factor be 20%, luminous strength ratio presents 80% state.As we know from Figure 67, compare, can make flicker decay to 75% from 90%, and the hangover amount is 0.20, keep the improvement of the existing example of the 1st row with the existing example of the 1st row.

In sum, in the present embodiment, can guarantee improvement hangover not only but also reduce the obstacle that glimmers significantly, the video of best in quality can be provided to observer.

Figure 68 is the figure of characteristic that each light-emitting mode of Figure 66 is shown.The transverse axis of Figure 68 is represented the hangover amount, and numerical value is more little, and picture quality is high more.The longitudinal axis of Figure 68 is the flicker amount, and numerical value is more little, and it is more little to glimmer, and picture quality is high more.

The luminous utilization of prior art changes duty factor D, and the value of hangover amount and flicker amount is moved on the track shown in Figure 68, and the desirable direction of improving shown in No.1 does not move toward blank arrow.At this moment, flicker amount and hangover amount are the balance relations, can not improve simultaneously.

In contrast, the circular horn among the figure is represented the characteristics of luminescence of present embodiment, distinguishes and improves hangover amount and flicker amount simultaneously.

Figure 69 (a)～Figure 69 (f) illustrates intermittently luminous component duty factor D and the intermittently figure that concerns usefulness of luminous phase place P.Intermittently luminous phase place is meant from vertical cycle and begins the ratio (with reference to (b) part of Figure 61) of time back, extremely intermittently luminous component center to vertical cycle.

Among Figure 69 (a)～Figure 69 (f), luminescent condition is duty factor D=30%, luminous strength ratio S1=90%.As indicated above, as display board, the liquid crystal of the high-speed response of imagination constant τ=about 1 millisecond service time.The hangover amount is identical with Figure 65, also the brightness of hangover is changed from 10% to 90% variation and is defined as the hangover amount.

Figure 69 (a), Figure 69 (c) and Figure 29 (e) are respectively P=30%, 50%, 70% luminescent waveform.Figure 69 (b), Figure 69 (d) and Figure 29 (f) are that the value of P is respectively 30%, 50% and 70% o'clock hangover state.Calculate the hangover state according to the hangover model shown in Figure 65.

As we know from Figure 69, during P=50%, the oblique line 1,3 of Figure 65 (e) part explanation is balanced good.Though P=30%, 70% o'clock oblique line 1,3 produce skew, the hangover amount is identical during with P=50%, and it is identical to improve the effect of trailing.

Figure 70 (a)～Figure 70 (f) illustrates intermittently luminous component duty factor D and the intermittently figure that concerns usefulness of luminous phase place P, and luminescent condition is identical with Figure 69 (a)～Figure 69 (f).But it is 10%, 50%, 90% situation that Figure 70 (a)～Figure 70 (f) illustrates luminous phase place P intermittently.

Shown in Figure 70 (b) and Figure 70 (f), P=10%, 90% o'clock improves the effect extreme difference of hangover.This is that luminescent waveform is divided into 2 because shown in Figure 70 (a) and Figure 70 (e).

Figure 71 (a)～Figure 71 (f) illustrates intermittently luminous component duty factor D and the intermittently figure that concerns usefulness of luminous phase place P.Luminescent condition is identical with Figure 69 (a)～Figure 69 (f), Figure 70 (a)～Figure 70 (f).But it is 15%, 50%, 85% situation that Figure 71 (a)～Figure 71 (f) illustrates luminous phase place P intermittently.Shown in Figure 71 (a)～Figure 71 (f), hangover improves good.

From Figure 69 (a)～Figure 69 (f), Figure 70 (a)～Figure 70 (f), Figure 71 (a)～Figure 71 (f) distinguishes as follows.The relation of duty factor D and luminous phase place P needs P 〉=D/2% or P≤(100-D/2) % because led pulse is good not to be divided in frame.Situation is divided intermittently luminous component beyond this point in frame shown in Figure 70 (a) and 70 (e).When in frame, dividing like this, suppose in the integration of tracing of human eye movement of objects marginal portion that slope drastic change does not have effect of the present invention, promptly do not improve the effect of hangover amount and flicker amount simultaneously.

Therefore, but load management makes it satisfy the condition of following formula than D and luminous phase place P intermittently.

D/2≤P≤(100-D/2) (wherein 0＜D＜100)

Here, during D=0%, mean that intermittently luminous component is 0, thereby here with its eliminating.During D=100%, be prior art intermittence luminescent waveform situation, thereby here with its eliminating.

Figure 72 illustrates the duty factor D and the figure of the relation of luminous phase place P intermittently.Transverse axis is D, and the longitudinal axis is P.D, P in the zone among this figure shown in the mesh point satisfy above-mentioned condition.

Among Figure 72, the boundary line that is in below, described zone is the line segment that satisfies the relation of P=D/2.Can in the zone of representing with mesh point of Figure 72, determine the value of D, P according to the type of the response speed of display board, light source, installation method etc.

Figure 73 (a)～Figure 73 (e) is the figure that the luminous phase place of the luminescent waveform of explanation present embodiment is used.Figure 73 (a) illustrate present embodiment mixed lighting light 1202 1 in the luminescent waveform of share, be the unit representation time with the frame in the transverse axis.That is, select pixel, finish the selection of next time in follow-up etching 1 in the etching 0 of time shaft.

Luminescent condition is identical with the condition of the 3rd row of Figure 67.That is, intermittently the duty factor D of luminous component is 20%, and intermittently the luminous strength ratio S1 of luminous component is 80%.Display board 1101 is as indicated above, if be the fast response liquid crystal of 1 millisecond of response with the time constant.Intermittently the luminous phase place of luminous light 1115 is in the center in frame period, and intermittently luminous phase place P is 0.5.

The result of the hangover amount that Figure 73 (b) produces when illustrating and calculating mixed lighting light 1202 illumination display boards 1101 with Figure 73 (a) with the simulation hangover amount computing method shown in Figure 65.The transverse axis of Figure 73 (b) is pixel unit (space), represents 1 pixel here.That uses among the definition of hangover amount and Figure 66 is identical, and the brightness of hangover is changed 10% changing to 90% space length and be used as the hangover amount of (slope).Here hangover amount is 0.2.

Figure 73 (c) is identical with Figure 73 (a), also is the luminescent waveform of present embodiment, but intermittently the luminous phase deviation of luminous light 1115 to the latter half of frame.The luminous phase place P at intermittence of the luminescent waveform shown in Figure 73 (c) is 75%.

Hangover waveform when Figure 73 (d) illustrates by the mixed lighting optical illumination display board 1101 of Figure 73 (c).The hangover amount of the hangover waveform shown in Figure 73 (d) is 0.33.Like this, because intermittently luminous phase place P changes, the hangover amount strengthens, and this is that oblique line 1 and oblique line 3 are out of balance because shown in Figure 73 (d), and the low dip of oblique line 1 partly surpasses as 10% of threshold setting.

Figure 73 (e) is the luminous phase place P and the figure of the relation of hangover amount at intermittence under the situation of luminescent condition (duty factor D=20%, luminous strength ratio S1=20%) that Figure 73 (a) and Figure 73 (c) are shown.

Distinguish from Figure 73 (e), under the situation of the luminescent condition of duty factor D=20%, luminous strength ratio S1=80% intermittently luminous phase place be 50% o'clock, when promptly intermittently the waveform of luminous light 1115 is in the center that frame repeats, can maximumly improve hangover.

For example, according to screen intensity (absolute brightness) state of device for video display and view environment etc., suppose to be decided to be as the definition that the threshold value of the oblique line 1,3 shown in (e) part of Figure 65 will not be observed in hangover 15% to 85% hangover brightness and change.The situation of this definition is equal to the hangover amount of Figure 73 (d) and the hangover amount of Figure 73 (b)

In the present embodiment, definition according to the hangover model shown in Figure 65 and Figure 66 (a)～flicker amount that Figure 66 (i) illustrates, the effect of improving of hangover amount and flicker amount quantitatively has been described, but the picture quality of device for video display comprises the part of many subjectivities, and be subjected to dominations such as view environment.

Therefore, consider all conditions of device for video display system, decision hangover threshold value, duty factor D, intermittently luminous strength ratio S1, the isoparametric optimum value of luminous phase place P intermittently of luminous component make it satisfy above-mentioned D/2≤P≤(condition of 100-D/2).

Figure 74 is the figure that uses according to the effect of subjective assessment explanation present embodiment.The white brightness of the screen intensity of device for video display (screen intensity when demonstration is white on the screen) is 450 nits, is to the fully bright degree of TV (TV) receiver.Nit (nit) is the unit of brightness.The evaluation map picture uses APL (AveragePicture Level: 3 kinds of average level) different rest images.

Image A is a dark generally image such as night scene for example.The APL of image A is 20%, and average screen brightness is equivalent to 100 nits.Image B is that APL is 50% image, and its average screen brightness is equivalent to 250 nits.Image C is a bright image such as blue sky for example, and its APL is 80% (being equivalent to screen intensity is 350 nits).

Show these evaluation map pictures at device for video display, switching also drives the luminescent waveform of the prior art shown in Figure 66 (a) and the luminescent waveform of the present embodiment shown in Figure 66 (c), thereby whether experiment can perceive image flicker.Test again in the time of perceiveing and whether feel that image flicker hinders and watch.The yardstick of subjective assessment is 5 grades.Yardstick is big more, and picture quality is high more.

Distinguish that from Figure 74 present embodiment is equivalent to as the impulse type of prior art luminous flicker and reduces effect and reach the degree that the observer can allow.And, the image of 3 kinds of APL (i.e. 3 kinds of brightness) is all found this effect equally.

As indicated above, the present invention utilizes the human eye characteristic low to the sensitivity of the northeast of mobiles in improving hangover.Therefore, even human eye sees that the screen intensity that continues luminous light 1116 illuminations in the value (moment peak brightness) of certain moment, does not influence the performance of improving hangover yet.

Would rather moment peak brightness be good with the degree that can see easily.Among Figure 66 (g), continuing luminous component is 20%.Therefore, the screen intensity of supposing display board is 450 nits, then we can say as wherein 20% 90 nits to depend on the illumination that continues luminous light 1116.The screen intensity of this 90 nit is the degree that human eye can fully be perceiveed.Distinguish that from the subjective assessment result of Figure 74 this lasting luminous component of 20% fully works to improving hangover and reducing flicker.

In the present embodiment, the video method of operating of display board for line by line scan or staggered scanning all available.

In the device for video display 1100 of present embodiment, light source is not limited to LED or CCFL.Adopt suitable intermittently luminous, lasting luminous light source to get final product.

Moreover in the present embodiment, the display board 1101 of establishing Figure 62 is for transmission-type is illustrated, but also can adapt to the reflection-type of modulating from the irradiates light of light source by reflection.

Present embodiment in Figure 62, establish with lamp 1109 and lamp 1110 be configured in display board 1101 under be illustrated, but be not limited to this configuration.In Figure 63, be located at the 1201 pairs of light in leaded light space again and mix and be illustrated, but but also configuration example and will intermittently luminous light 1115 and continue the process that luminous light 1116 is directed to display board 1101 and mix two kinds of light in light guide plate as using light guide plate.Also can with the electric signal of component that is equivalent to intermittently luminous light 1115 and continues luminous light 1116 with electric mode addition after, the control light source makes it luminous, thereby omit light is mixed the composition of usefulness.

It is example that present embodiment vertical synchronizing signal in Figure 62 is lifted 60 hertz TSC-system vision signal, but 75 hertz vision signal of the rgb video signal of the also available for example personal computer of present embodiment.At this moment, the flicker amount can be by the Fourier transform of luminescent waveform, to be stipulated with respect to 75 hertz of harmonic waves of DC component and to estimate.

The parameter D that present embodiment is set at the device for video display 1100 of the 3rd row notebook embodiment of Figure 67, the numerical example of S1, but the present invention is not subjected to this numerical definiteness.

Explanation in the present embodiment is established and continued the luminous constant of luminous light 1116, and is irrelevant with vision signal 1111, but also can change by the frequency of the vertical synchronizing signal that is not less than 3 times of vision signals 1111.Observer's eyes are to very low with about 150 hertz of sensitivity that repeat light on and off.At this moment, even if continue the light that luminous light 1116 strictnesses are changes, human eye is not followed the tracks of yet, and is viewed as just like carry out luminous light by constant intensity.

Moreover, in the present embodiment, with luminous light 1115 intermittently and continue luminous light 1116 luminous strength ratio just like the mode of fixed value be illustrated, but can judge that also vision signal 1111 is fierce movable image, movable slightly image or motionless fully rest image, and make intermittently luminous light 1115 and continue the luminous intensity interlock of luminous light 1116 according to this signal.

For example, under the situation of rest image, the luminous strength ratio that continues luminous light 1116 is controlled to roughly 100%.Contain slightly under the situation of movable image, the luminous strength ratio that continues luminous light 1116 is taken as is not less than 50%, intermittently the luminous strength ratio of luminous light 1115 is taken as and is not more than 50%.Under the situation of the image of fierce activity, make the intermittently luminous intensity maximum of luminous light 1115.Also need to utilize the control that continues both luminous intensities of luminous light 1116 and intermittently luminous light 1115, the screen intensity of managing into display board does not change.Also can carry out above-mentioned control, to display image regulation optimal luminescent condition.

In sum, in the present embodiment, mix to continue luminous light and intermittently different luminous of this two specific character of luminous light, display board is thrown light on, thereby can suppress the hangover of mobiles again, the profile of clear display suppresses the obstacle that glimmers again simultaneously.In improving the live image hangover, utilize the human eye response image low, the degree that the screen intensity that the luminous intensity of the lasting luminous light 1116 in the instantaneous light emission causes is discerned easily for the observer to the sensitivity of the contrast of live image.

Again, in the present embodiment, use lamp 109 and lamp 110 to obtain, but also can constitute the light source that uses characteristic, and between display board and light source, form in the light path and dispose light control member with lamp 110 from different luminous of the image of each lamp.Light control member is the optics optical gate that liquid crystal such as for example strong dielectric liquid crystal is formed, and utilizes the break-make control that applies voltage, and transmissivity is switched to total transmissivity and half transmitting.Synchronous with the vertical synchronizing signal of video, when voltage turn-on for example, form 100% transmissivity, make the illumination light transmission of light source, produce intermittently luminous light, and when voltage is blocked, transmissivity is reduced to 50%, produces lasting luminous light, thereby the ideal that can reach hangover amount and flicker amount is improved.

Again, the screen intensity of device for video display improves, and then perceives flicker (Ferry-Porter rule) easily.Therefore, the high brightnessization of device for video display is easy to generate the flicker obstacle.The body of rod of the cellula visualis of human eye than cone to the light on and off sensitivity, promptly the periphery of visual field than the center to the light on and off sensitivity, so the giant-screenization of device for video display is discerned the flicker obstacle easily.The display quality improvement method of the device for video display of present embodiment is especially effective to the high brightnessization and the giant-screenization of device for video display.

Moreover in the present embodiment, intermittently luminous light luminous load along separate routes satisfies D/2≤P≤(relation of 100-D/2) than D and luminous phase place P intermittently.The subjective assessment that can consider device for video display is to hangover amount, the view of flicker amount, all conditions of system, decision as the hangover threshold value of the parameter of device for video display, duty factor D, intermittently luminous component luminous strength ratio S1, intermittently the optimum value of luminous phase place P etc. satisfies D/2≤P≤(100-D/2).

Embodiment 15

The device for video display of another embodiment of the present invention is described with Figure 75 and Figure 76.Figure 75 is the figure that the composition of the device for video display 1400 of using present embodiment is described.Shown in Figure 75, the composition of device for video display 1400 comprise liquid crystal board (video display unit) 1401, liquid-crystal controller 1402, source electrode controller 1403, gate drivers 1404, source electrode 1405 gate electrodes 1406, intermittently light emission drive circuit 1407, continue light emission drive circuit 1408, lamp unit (luminous component) 1409, lamp 1410, lamp 1411, light element 1412, light element 1413 and light element 1414.

Form the source electrode 1405 of source of configuration driver 1403 drivings and the matrix of the gate electrode 1406 that gate drivers 1404 drives on the LCD panel 1401.Intersection point configuration pixel (not shown) at these source electrodes 1405 and gate electrode 1406.Figure 75 puts down in writing gate electrode 1406 with reference number G1 to G6.

Liquid-crystal controller 1402 is according to vision signal 1451, carries out the processing that needs in the demonstration running of liquid crystal board 1401, with control element electrode 1403 and gate electrode 1404.

Gate drivers 1404 is selected gate electrode 1406 successively, applies signal.Liquid crystal board 1401 is a transmission-type, upgrades the transmissivity of the pixel under this gate electrode when selecting certain gate electrode.

The transmissivity of pixel is by the video information decision from the source electrode.Transmissivity is upgraded the frequency decision of the frequency of running according to the vertical cycle of vision signal 1451.For example in the TSC-system signal be 60 hertz.Here, the time resolution characteristics (being the time response of transmission change to the state of hope) (time constant) of supposing the liquid crystal that exists in each pixel are the fast response liquid crystal about 1 millisecond.

Liquid-crystal controller 1402 outputs to intermittently light emission drive circuit 1407 with vertical synchronizing signal 1452.Lamp unit 1409 comprises the lamp 1410 that luminous light at intermittence is shown and exports the lamp 1411 that continues luminous light.The all for example available single or multiple LED of lamp 1410 and lamp 1411 realizes.3 each lamp unit shown in Figure 75, but the quantity that is located at the lamp unit of device for video display 1400 is not limited thereto.

Intermittently luminous light and lasting luminous light are mixed in 1409 inside, lamp unit, export mixed lighting light 1457, mixed lighting light 1458 and mixed lighting light 1459 respectively.These mixed lighting light are input to light element 1412, light element 1413 and light element 1414 respectively.

Light element 1412～1414 is printed the pattern (not shown) that makes light diffusion usefulness, and guiding is also spread from the mixed lighting light of end face input, and mixed lighting light is outputed to liquid crystal board.Light element 1412～1414 is corresponding one by one with lamp unit 1406, and is for example separated by optical baffle, and mutual illumination light portion is mixed.

Each cover (being divided into each block one) of light element 1412～1414 and 3 cover lamp unit 1409 constitutes the zone of local lighting liquid crystal board 1401.The zone on light element 1412 illumination screen tops.Light element 1413 illumination center Screens, light element 1414 illumination screen bottoms.

Intermittently light emitting drive unit 1407 produces intermittent pulse signal 1453,1454,1455 according to vertical synchronizing signal 1452, supplies with the lamp 1410 of each lamp unit 1409.Continue light emission drive circuit 1408 supply with the lamp 1411 of each lamp unit 1409 shared and with the irrelevant continuous persistent signal 1456 of vision signal 1111.

Figure 76 is the sequential chart of running usefulness of the device for video display 1400 of explanation Figure 75.(a) part of Figure 76 illustrates the waveform of vertical synchronizing signal 1452.(b) part of Figure 76 illustrates the waveform of the signal that applies on the grid (G1 or G2) of the pixel under the zone of controlling light element 1412 illuminations.(c) part of Figure 76 illustrates the luminescent waveform of mixed lighting light 1457.(d) part of Figure 76 illustrates the waveform of the signal that applies on the grid (G3 or G4) of the pixel under the zone of controlling light element 1413 illuminations.(e) part of Figure 76 illustrates the luminescent waveform of mixed lighting light 1458.Figure 76 (f) part is controlled the waveform of the signal that applies on the grid (G5 or G6) of the pixel under the zone of light element 1414 illuminations.(g) part of Figure 76 illustrates the luminescent waveform of mixed lighting light 1459.(c) of Figure 76 partly, (e) part and (g) part the longitudinal axis be luminosity.

Here, one of feature of the device for video display 1400 of present embodiment is, shown in Figure 75, liquid crystal board is divided into a plurality of zones after, thrown light in each zone.Its illumination light is to mix the mixed lighting light that intermittence, luminous light obtained with continuing luminous light.The illumination each the district mixed lighting light between intermittence luminous light each one of luminous phase place identical.Liquid crystal board 1401 utilizes selects gate electrode (addressing), makes the transmissivity of pixel upgrade regularly different because of the position of screen.By making the luminous phase deviation between many each lamp unit, absorb the influence of this renewal timing phase difference, obtain the optimal luminescent phase place.

The vertical synchronizing signal 1452 of Figure 76 (a) part be show liquid crystal board 1401 video running benchmark regularly.T0 is repetition time (frame period).The gate electrode that signal shown in (b) part of Figure 76 drives is positioned at the screen top of display screen 1101, and its phase place is identical with vertical synchronizing signal or roughly the same.

Mixed lighting light 1457 shown in Figure 76 (c) part intermittence luminous light luminous phase place be positioned at the center of repetition time of " low " pulse of data-signal, T1 has the relation that equates with T2.Here, T1 is that the luminous component at intermittence of benchmark begins the time before luminous with the rising edge of the described data-signal of Figure 76 (b) part.When supposing phase lag that luminous component intermittently begins is the positive time, is the negative time when intermittently the phase place of luminous component is leading.T2 finishes the period T 0 end preceding time of luminous time as benchmark with intermittently luminous component.Intermittently the luminous phase place of luminous component is subjected to from light emission drive circuit 1407 intermittent pulse signal 1453 controls at intermittence.Utilize the control of luminous luminous phase place at intermittence of this signal and mixed lighting light, obtain the described effect of trailing and glimmering of reducing of embodiment 14.

Data-signal shown in (d) part of Figure 76 is to make the time (G3 or G4) of center Screen part follow the tracks of the signal of usefulness, to vertical synchronizing signal 1452 shift time T3.The pass of T3 and frame period T0 is that about 3 times of T3 equal T0.(e) part of Figure 76 is the luminescent waveform of the mixed lighting light 1458 of pixel under lighting hours G3, the G4, has the renewal that T4 equates with T5.

The phase place of the gate electrode of (f) part of Figure 76 is with respect to vertical synchronizing signal shift time T6.About 3/2 times of T6 equals T0.The mixed lighting light 1459 of Figure 76 (g) part intermittence luminous light luminous phase place have the relation that T7 equates with T8.Make like this drive and upgrade the timing of pixel and this pixel of illumination mixed lighting light intermittence luminous light phase place consistent with the center of pixel renewal timing, thereby can realize the described effect of trailing and reducing to glimmer of reducing of embodiment 14 to whole display frame.

In the present embodiment, light element is divided into 3, but is divided into 4 or manyly also can obtain same effect.In the present embodiment, establishing light source is that LED is illustrated, but is not limited to LED.In the present embodiment, establishing liquid crystal board is that transmission-type is illustrated, but reflection-type also can be used for present embodiment.

In the present embodiment, light element can be used as the light guide plate of compositions such as acrylic resin, the side of lamp configuration of cells, from the end face input mixed lighting light of light guide plate in light guide plate.Can make also intermittently that luminous light does not mix in the lamp unit with lasting luminous light, and in light guide plate, mix.Also the back side of lamp configuration of cells at liquid crystal board the space be can be provided with between lamp unit and the liquid crystal board, intermittently luminous light and lasting luminous light mixed in this space.

In the present embodiment, establish and have dividing plate, but also can not establish dividing plate, and utilize the directivity of light source that illumination light is not each other mixed so that the mutual illumination light in lamp unit is not mixed.

In sum, the zone of illumination liquid crystal board is divided in the combination of the characteristic use lamp unit of the device for video display of present embodiment and light element.This illumination light be obtain after mixing luminous light intermittently and continuing luminous light mixed lighting light.Throw light on each regional mixed lighting light intermittence luminous component luminous phase place respectively different between each district.It is different to utilize the selection (addressing) of gate electrode that the pixel transmission rate is upgraded regularly, thus by make a plurality of lamps unit intermittence luminous light luminous phase deviation, the influence that solves this renewal timing phase.

The effect of bringing with mixed lighting optical illumination LCD panel is described identical with embodiment 14, and this effect can provide live image to show the best image video of distinctness and flicker free obstacle.

Among Figure 76, establish T1=T2, T2=T5, T7=T8 is illustrated, but also can with these with respect to grid impulse intermittence luminous light phase place be designed to satisfy D/2≤P≤(100-D/2) the condition of embodiment 14 explanations.If the luminous phase place at intermittence of Figure 61 explanation is applied to Figure 76, P=(T0+T1-T2)/2 then.Intermittently fluorescent lifetime is D=T0-T1-T2 than D.

Therefore, derive 0≤T1, as the condition that obtains effect of the present invention from Figure 76.That is, T1 is not less than 0, and then in the unit of repetition period T0, intermittently luminous component is not divided into 2, obtains good hangover and reduces effect.T1 is not less than 0, and its implication lags for the rising edge of the luminous phase place of the beginning of luminous component intermittently than data-signal.And, derive the condition of 0≤T2 too.T2 is not less than 0, and its implication is that the time (in other words, the time of the rising edge of next signal) before the phase place of the intermittently luminous end of luminous component finishes than period T 0 is leading.

Luminescent waveform is when the repeating signal of period T 0 and T1 have negative value, and T2 also is a negative value.For example, T0=17 millisecond and making when intermittently the fluorescent lifetime of luminous component is 7 milliseconds can be undertaken luminous by T1=1 millisecond, T2=9 millisecond.Also can be undertaken luminous by T1=5 millisecond, T2=5 millisecond.Also can make T1=10 millisecond, T2=0 millisecond.Set the T1=13 millisecond, T2 is negative, thereby can not select this luminous phase place.During the T2=12 millisecond.T1 is a negative value, so can not get the effect of present embodiment.Therefore can not select this luminous phase place.The device for video display most cases is adjusted picture quality with subjective judgement, but the parameters such as the fluorescent lifetime of luminous component intermittently and luminous intensity of also can making decision in the condition of 0≤T1 or 0≤T2.

Embodiment 16

The device for video display of another embodiment of the present invention is described with Figure 77 to Figure 79.The composition of the device for video display of present embodiment identical with shown in Figure 75.Modulation is a transmission-type liquid crystal from the parts of the illumination light of light source.

In the present embodiment, different with embodiment 14 with embodiment 15, the liquid crystal of supposing to have general response characteristic.General response characteristic is meant the characteristic of about 2 milliseconds to 5 milliseconds of time constants.Time constant defined by roughly 63% the time that changes to as the transmissivity state of the target of hope.90% the time as the transmissivity state of target of reaching is roughly 1.3 times of time constant.The life period constant is the liquid crystal of 10 milliseconds or longer low-response in this world, but here with its eliminating.

The present invention is a purpose to improve the hangover amount.As the prerequisite of improving the hangover amount, known needs are taken into account the improvement and the improvement of liquid crystal response time of maintenance.To the liquid crystal of low-response carry out maintenance luminous improve the time, it is impaired to produce the image border.Therefore,, the hypothesis upper limit of the time constant of liquid crystal is taken as 5 milliseconds here.

Figure 77 is the sequential chart of running usefulness of the device for video display of explanation present embodiment.(a) part of Figure 77 is to supply with the data-signal of the gate electrode that belongs to this pixel when paying close attention to certain pixel.T0 shown in (a) part of Figure 77 is the cycle of the vertical synchronizing signal of vision signal 1111, is 16.7 milliseconds in the TSC-system signal.The transmission change of the pixel of paying close attention to when the time constant that Figure 77 (b) part illustrates liquid crystal is 3.5 milliseconds.Time of 90% that this liquid crystal changes to the object penetrating rate is about 8 milliseconds.Pixel change in certain frame with white corresponding transmissivity after, change in the next frame and black corresponding transmissivity promptly 0%.Figure 77 (c) part and (e) longitudinal axis of part be instantaneous light emission brightness.

(c) part of Figure 77 is the luminescent waveform of the mixed lighting light of illumination pixel.The condition of luminescent waveform is identical with the described condition of the 3rd row of Figure 67.That is, intermittently the duty factor D of luminous component is 20%, is 20% with respect to the ratio S1 of the overall luminous intensity of luminous component intermittently.T11 shown in Figure 77 (c) part is luminous light time of rising during the signal " low " intermittently.T1 illustrates the best timing of (b) liquid crystal partly of illumination Figure 77, and T11 is 75% of T0.

(d) part of Figure 77 illustrates the transmission change of the liquid crystal different with (b) part of Figure 77 (being that the time constant is 2.2 milliseconds a liquid crystal).Time of 90% that this liquid crystal changes to the object penetrating rate is about 5 milliseconds.Figure 77 (c) part illustrates the state of the best mixed lighting light that liquid crystal of (d) part of illumination Figure 77 uses, as its intermittently the T12 of the phase place of luminous component be 65% of T0.

Figure 78 (a)～Figure 78 (d) be the responsive time constant of explanation liquid crystal when being 3.5 milliseconds intermittence luminous component the figure that uses of optimal luminescent phase place.The luminescent condition of light source is identical with (c) part of Figure 77, and intermittently the duty factor D of luminous component is 20%.Intermittently a beam intensity ratio S1 of luminous component is 20%.

Figure 78 (a) illustrates the response wave shape of liquid crystal, is the response that writes the transmissivity of 3 frames when white.Represent the indicial response of liquid crystal with exwponential function approximation, its time constant is above-mentioned 3.5 milliseconds.Figure 78 (b) illustrates the luminescent waveform of light source.Intermittently luminous phase place P is 75% of the best.Hangover amount when Figure 78 (c) is illustrated in the hangover model shown in Figure 65 liquid crystal response set the characteristic of Figure 78 (a) and the luminescent waveform of light source set the characteristic of Figure 78 (b).The threshold value of supposing the hangover amount is 10% to 90%.The hangover amount is about 0.2 pixel.

The hangover response of the situation of Figure 73 explanation is straight line, is curve but contain in the hangover model of indicial response of liquid crystal, shown in Figure 78 (c).Yet the slope of oblique line 1,3 parts shown in (e) part of Figure 65 is mild with respect to oblique line 2, and human eye does not have response, thereby obtains the effect of embodiment 14 explanations.

Characteristic when Figure 78 (d) is illustrated in Figure 78 (c) amount of hangover and changes intermittently luminous phase place P in calculating.Find out that from this figure P is 75% to 80% o'clock hangover amount minimum, obtains high image quality.In the part beyond this P scope, the hangover amount increases.This part because of the oblique line 1,3 shown in Figure 65 (e) part surpasses the hangover amount threshold value of setting.

Figure 79 (a)～Figure 79 (d) be explanation liquid crystal time constant when being 2.2 milliseconds intermittence luminous component the figure that uses of optimal luminescent phase place.(c) part of the luminescent condition of light source and Figure 77 and (e) part is identical.

Figure 79 (a) illustrates the response wave shape of liquid crystal.The indicial response of representing liquid crystal with exwponential function approximation.(b) of Figure 79 illustrates the luminescent waveform of light source.Intermittently luminous phase place P is 65% of the best.Hangover amount when Figure 79 (c) is illustrated in the hangover model shown in Figure 65 liquid crystal response set the characteristic of Figure 79 (a) and the luminescent waveform of light source set the characteristic of Figure 79 (b).The hangover amount is about 0.19 pixel.Characteristic when Figure 79 (d) is illustrated in Figure 79 (c) amount of hangover and changes intermittently luminous phase place P in calculating.Find out that from this figure P is 60% to 70% o'clock hangover amount minimum, obtains high image quality.In the part beyond this P scope, the hangover amount increases.This part because of the oblique line 1,3 shown in Figure 65 (e) part surpasses the hangover amount threshold value of setting.

In sum, the device for video display of flicker embodiment is with comprising the 1st luminous component and the 2nd luminous component or luminous component and continue the illumination light illumination liquid crystal of luminous component intermittently.Thereby, can obtain unavailable hangover amount and the flicker amount improved simultaneously in the existing pulsed illumination.Here, adopt response ratio liquid crystal more slowly.

In the case, the optimum value of hangover amount is by intermittently luminous phase place P decision, and its phase place changes because of the timeconstant of liquid crystal.Therefore, establishing best intermittently luminous phase place P is PA, then PA=F[τ].Here, F[] implication be function.

This function is not simple linear function, and P is for becoming the trend that increases greatly along with τ.Responding and make τ fast is 0 o'clock, PA=50%.This situation is as illustrated with Figure 73.Therefore, under the situation of certain timeconstant, in the time of will being taken as K by the constant of function F [] decision, the pass of formation is PA=50+K, wherein, and 0≤K≤(50-D/2).

Constant determines after can measuring the liquid crystal response of device for video display, also can be according to the experiment decision optimum value of subjective assessment.In the luminous related prior art of impulse type, latter half the best of data-signal under this pixel when pulse of light on and off is lighted phase place and is taken as the latter half of vertical synchronization of the video that liquid crystal fully responds or pass and gazes at certain pixel.Yet in the present embodiment, need utilize that the low characteristic of observer's dynamic contrast response makes oblique line 1,3 can not get identification in the oblique line 1,2,3 shown in (e) part of Figure 65.The equilibrium of oblique line 1,3 is by the time constant decision of liquid crystal.Therefore, control intermittently luminous component is rewritten the phase place that repeats to operate to vision signal, so that the balanced oblique line 1,3 that produces (e) part of Fig. 6 well makes its not observed person's identification.

Embodiment 17

The device for video display of another embodiment of the present invention is described with Figure 80 to Figure 83.Display board in the device for video display of present embodiment is that active array type drives and self luminous EL (electroluminescence) plate.Different during transmission-type display board shown in the illumination light illumination embodiment 14 of EL plate and light source, meet the electric current of image information by the EL element circulation of each pixel arrangement, control luminous bright pressing, the generation image.

Figure 80 is the figure of composition of pixel that the EL plate of present embodiment is shown.EL pixel 1601 comprises scan electrode 1602, signal electrode 1603, TFT1604, capacitor 1605, TFT1606, TFT1907, TFT1608, EL liquid crystal 1609, power supply 1610, scan electrode 1611.

For example during the TSC-system vision signal, there are 525 scan electrodes 1602 in the display board.The vertical frequency of TSC-system vision signal is 60 hertz, thereby selects scan electrode 1602 every about 31.75 microseconds (=1/60/525).Scan electrode is arranged toward the horizontal direction of display board, and is shared with other pixel.

Supply with the image information that shows from signal electrode 1603.For example the TSC-system vision signal then exists 640 or 720 signal electrodes 1603 in the display board.Signal electrode 1603 is shared between a plurality of pixels of arranging toward the vertical direction of display board.The scan electrode 1602 of the pixel of select paying close attention to and when supplying with pulse, the TFT1604 conducting.Owing to regularly signal electrode 1603 is supplied with image informations, this information is remained in the capacitor 1605 with the form of voltage (or electric charge) according to this.Concerned pixel is the non-selection phase, then TFT1604 blocking-up, the voltage of maintenance capacitor 1605.The electric current that EL element 1609 determines by the voltage that keeps from this capacitor 1605 of power supply 1610 circulations, luminous with the brightness of hope.Here, there are 2 systems to EL element 1609 supplying electric currents in the EL pixel 1601 of present embodiment.2 systems are meant by the system of TFT1606 and the system by TFT1607.Utilization is by the TFT1608 control TFT1607 break-make of scan electrode 1611 controls.

Figure 81 is the figure of the running usefulness of explanation EL pixel 1601.(a) part of Figure 81 illustrates the waveform of the pulse signal of supplying with scan electrode 1602.Repetition period T is 16.7 milliseconds (=1/60) in the TSC-system vision signal.(b) part of Figure 80 1 illustrates the waveform of the pulse signal of scan electrode 1611.Figure 80 1 (c) part illustrates the waveform of electric current of the drain electrode circulation of TFT1606.This electric current is supplied with from power supply 1610, and the source electrode-drain electrode by TFT1606 flows to EL element.Scan electrode 602 be " height " during, the voltage between terminals of capacitor 1605 is upgraded in the TFT1604 conducting, thereby this electric current is changed.

For example the common liquid crystals response speed is fast for the response ratio of EL element, supposes to change to during scan electrode 1602 is for " height " electric current of hope.Shown in (c) part of Figure 81, set bigger electric current I 1 in certain cycle, make pixel luminous bright.In the cycle of the following little electric current I 2 that circulates, make EL pixel 1609 luminous dark.

(d) part of Figure 81 illustrates the waveform from the electric current of power supply 610 supplies by TFT607.The amplitude of this electric current is identical with the system of TFT1606, and also the voltage by capacitor 1605 determines.Therefore, Figure 81 (c) part and (d) part in, I1=I3, I2=I4.

But TFT1607 is utilizing difference aspect scan electrode 1611 controls.That is, the pulse of scan electrode 1611 be " height " during, the TFT1608 conducting.At this moment, the grid of TFT1607 and the voltage between the source electrode are 0, thereby the TFT1607 blocking-up.Scan electrode 1611 be " low " during, TFT1608 blocking-up, at this moment TFT1607 is controlled by the voltage between terminals of capacitor 1605, circulating current like that shown in (d) part of Figure 81.

The electric current of circulation is shown in Figure 81 (e) part in the EL element 1609, and it is the waveform shown in Figure 81 (c) part and (d) the waveform sum shown in the part.That is, I5=I1, I6=I1+I3.I7＝I2，I8＝I2+I4。

EL element 1609 is carried out luminous according to the current waveform of (e) part of Figure 81.Luminescent waveform depends on the electric current-characteristics of luminescence of EL element, if but establish characteristic here and have proportional relation, then luminescent waveform is equal to (e) part of Figure 64.Luminous by being undertaken by this waveform, Fig. 8 explanation that obtains embodiment 14 time improves the effect of hangover amount and flicker amount.

Illustrated as mentioned, the device for video display of present embodiment is the autoluminescence EL plate of for example driven with active matrix.Have 2 TFT by capacitor 1605 controls of store video information, respectively at past each the TFT circulating current of different timings, thus the generation luminescent waveform corresponding with intermittent light and lasting light.That is luminous the 1st luminous component and the 2nd luminous component that comprises Figure 61 explanation of pixel.Perhaps pixel luminous comprises intermittently luminous component and continues luminous component.

By the management of the impulse phase of scan electrode 1611 luminous phase place P is intermittently controlled.The response of EL element is generally fast than liquid crystal, thereby illustrated as Figure 73, and optimum phase can be 50%, but optimum phase also can be controlled according to the phase place of scan electrode 1611 when changing because of other factors.

Can compare D according to " low " phase control load of scan electrode 611.When wishing the luminous energy (being luminous intensity) of increasing luminous component at intermittence or the 1st luminous component, duty factor D is increased.

The EL plate luminous with existing maintenance is identical, the selection running time of scan electrode 1602 also can be 1/60 second, thereby needn't make scan electrode driver (not shown) and signal electrode driver (not shown) high speed, needn't externally use the frame memory of stored video signal etc., carry out clock rate conversion etc.Capacitor can be 1, and is also identical with the luminous EL plate of existing maintenance.

Figure 82 be the explanation EL element another form the figure of routine usefulness.Among Figure 82, mark identical symbol to having with the part of Figure 80 identical functions.EL pixel 1701 among Figure 82 comprises capacitor 1702, capacitor 1703, TFT1704, TFT1705, TFT1706, scan electrode 1707 and scan electrode 1708.

When selecting pixel, the TFT1604 conducting writes capacitor with the voltage corresponding with video information, but series capacitors 1702 and capacitor 1703 are write this voltage.Make TFT1705 and TFT1706 repeat alternately break-make, switch source electrode-grid voltage of TFT1704.

That is, in TFT1705 conduction period and TFT706 conduction period, the voltage of capacitor 1703 and capacitor 1703 and the voltage between terminals sum of capacitor 1702 become source electrode-grid voltage of TFT1704 respectively.

Utilize these 2 grid voltages to switch the electric current of EL element 1609.TFT1706 is subjected to scan electrode 1707 controls.TFT1705 is subjected to scan electrode 1708 controls.Also can make to have phase inverter in the pixel, the signal that for example makes the logical inversion of scan electrode 1707 is input to the grid of TFT1705.

Figure 83 is the figure of the running usefulness of explanation EL element 1701.(a) part of Figure 83 illustrates the waveform of the pulse signal of supplying with scan electrode 1602.(b) part of Figure 83 illustrates the waveform of the pulse signal of scan electrode 1705, and (c) part of Figure 83 illustrates the waveform of the pulse signal of scan electrode 1706.(d) part of Figure 83 illustrates the current waveform of the EL element 1609 of TFT1705 control.

Scan electrode 1708 be " height " during, the TFT1705 conducting is by grid-voltage between source electrodes of the terminal voltage of capacitor 1703 regulation TFT1704.This voltage is the voltage that obtains after the voltage dividing potential drop that writes in the time of will selecting pixel with capacitor 1703 and capacitor 1702.If the voltage that writes when selecting is V, the static capacity of capacitor 1702 and capacitor 1703 be respectively C1, C2 then the terminal voltage V2 of capacitor 1703 be shown in the following formula.

V2＝V*(C1*C2/C1+C2)

(e) part of Figure 83 illustrates the current waveform of the EL element 1609 of TFT1706 control.Scan electrode 1707 be " height " during, the TFT1706 conducting, grid-voltage between source electrodes of TFT704 becomes the voltage V that writes when selecting pixel.

Here, V and V2 are the relation of V2＜V, be directly proportional with the drain current of TFT1704 if suppose grid-voltage between source electrodes of TFT1704, then the electric current I 13 shown in (e) part of electric current I 11, I12 and the Figure 83 shown in Figure 83 (d) part, the pass of I14 are shown in the following formula.

I11＝I13*(C1*C2/C1+C2)

I12＝I14*(C1*C2/C1+C2)

Figure 83 (f) part illustrates the waveform of the electric current of actual circulation EL element 1609, is the waveform of (d) part of Figure 83 and (e) the waveform sum of part.If the electric current of EL element 1609-luminosity characteristic is linear, then the luminosity waveform of EL element 609 be (f) waveform shown in partly of Figure 83.

That is luminous the 1st luminous component and the 2nd luminous component that comprises Figure 61 explanation of pixel.Perhaps comprise intermittently luminous component and lasting luminous component.Utilize this waveform, can realize the hangover amount of embodiment 14 explanations and the improvement that flicker is measured both.With the management of the impulse phase of scan electrode 1707,1708 to luminous phase place intermittently and intermittently luminous load control than D.When the luminous energy (being luminous intensity) of hope luminous component at intermittence or the 1st luminous component was big, the capacity ratio of capacitors available 1702,1703 was controlled." low " phase of scan electrode 1707 is increased, " height " phase of scan electrode 1708 is reduced.

In sum, as with Figure 82 and Figure 83 explanation, the device for video display of another embodiment of the present invention uses the video information of capacitor stores in the mode of dividing potential drop.The luminous EL plate of the selection of scan electrode 1602 running time and existing maintenance is identical, it also is 1/60 second, thereby needn't make scan electrode driver (not shown) and signal electrode driver (not shown) high speed, needn't externally use the frame memory of stored video signal etc., carry out clock rate conversion etc.

In the above description, illustrated that display board is the situation of organic EL plate, but also can be in non-luminous transmissive liquid crystal panel for example, the data that control writes pixel, and modulation is from the illumination light of light source, thus realize above-mentioned pixel luminescent waveform.Under the situation of liquid crystal board, pixel comprises TFT and capacitor, but also can switch TFT by inserting brightness with mentioned above identical, the electric charge of control capacitor, and the transmissivity of change liquid crystal is set the brightness of pixel.Also but the TFT of brightness add to be switched in portion, and is no less than 2 times visit pixel selection TFT by 1 frame (frame is toward the unit of the formation picture) cycle, writes the data suitable with different brightness.

Embodiment 18

The device for video display of another embodiment of the present invention is described with Figure 84.In the device for video display of present embodiment, display board is that active array type drives and self luminous EL (electroluminescence) plate or active array type drive non-luminous liquid crystal board.In the present embodiment, by the EL element of each pixel arrangement or liquid crystal cell are supplied with the voltage that meets image information, control luminous bright dark, the generation image.

Figure 84 is the figure of timing of running of the device for video display of explanation present embodiment.For illustrative ease, the sweep trace of supposing display board is 5.(a) part of Figure 84 illustrates the waveform of vertical synchronizing signal, is the benchmark that picture repeats.The TSC-system vision signal, then the frequency of vertical synchronizing signal is 60 hertz.(b) part of Figure 84 illustrates the waveform of horizontal-drive signal.Suppose that sweep trace is 5,1 vertical cycle produces 5 subpulses of H11 to H15.(c) part of Figure 84 illustrates the waveform of data-signal, supplies with signal to 1 in many single data electrode of arranging toward the display board horizontal direction.

Here, the device for video display of present embodiment has the frame memory of stored video signal separately with frame unit, by visiting the view data of this frame memory storage, carries out data staggered toward the time shaft direction.Here, the pixel that is positioned on the same data electrode is distributed 1 to 5 number by putting in order of vertical direction, making the pixel that is positioned at the screen topmost is pixel 1, and the pixel that is in its below is a pixel 2.Then, the video data that pixel 1 is shown is taken as D1, and the video data that pixel 2 shows is taken as D2.D11, D12, D13, its implication is: D1 is divided into 3 and at the staggered video data of time-axis direction.

Shown in Figure 84 (c) part, for example the data of pixel 1 usefulness are then carried out time interleaving, make first the generations D11 during the H11, and the 2nd of H13 produces D12, the 3rd the generation D13 of H14.Suppose input 100% white level (8,255 grades) among the D1 of certain frame, input 60% ash level (8,150 grades) in the next frame after 1/60 second.The division of view data is determined by duty factor D, luminous strength ratio S.For example suppose duty factor D=50%, luminous strength ratio S=80%.

Establishing the instantaneous peak brightness that the pixel of device for video display can be luminous again is 1000 nits.The white signal of D1=100%, then the 1st of Fig. 1 explanation the luminous instantaneous light emission brightness (height of the 1st luminous longitudinal axis) is 100%, i.e. 1000 nits.The 2nd luminous luminous strength ratio S is 20%, and the instantaneous light emission brightness of Fig. 1 (height of the 2nd luminous longitudinal axis) is 25%, i.e. 250 nits.Calculate by 250 nits=1000 nit *, 50%/80%*20%.50%, 80%, 20% numerical value is equivalent to D, S, the 100-S of Fig. 1 respectively.Like this, the calculating with duty factor D and luminous strength ratio S decision determines D11, D12, D13 from D1.Divide and also to set video data, make 100% white signal carry out luminous with the instantaneous light emission brightness of D11=25%, D12=100%, D13=25%.Suppose that video data and luminosity are proportional relation, in other words, video data is 8 when long, being divided into of 255 grades white signal: D11=64 level, D12=255 level, D13=64 level.According to these instantaneous light emission brightness and duty factor 50%, average screen brightness is the 1000*0.5+250*0.5=625 nit.

Under the situation of the gray level of D1=60%, form 60% value with the value of white signal explanation.That is, if D1=60%, then D11=15%, D12=60%, D13=15%.If D11, D12, each self-corresponding brightness of D13 are L11, L12, L13, if 100% instantaneous light emission brightness is 1000 nits, L11=150 nit then, L12=600 nit, L13=150 nit.

(d) part of Figure 84 illustrates the waveform of the pulse signal that the scan electrode that scans 1 pixel is applied.Suppose that pixel 1 is in screen top.Suppose that sweep trace is 5, and suppose to exist on the same data electrode 5 pixels.Suppose that described vision signal D1 is the video data that this pixel 1 shows.

Sweep signal produces 3 subpulses at 1 vertical cycle.This pulse is time of about 1/3 of horizontal cycle.1 vertical cycle produces 3 times pulse respectively to horizontal-drive signal generation phase deviation.The phase place of time orientation division and the video data D11, the D12 that interlock, D13 is corresponding with the phase place of sweep signal during " height " of pixel 1.That is, by the video data of pixel 1 staggered on the time orientation being input to pixel 1 with sweep signal, determined pixel 1 luminous.

In the waveform of (d) part of Figure 84, the 1st pulse that begins from a left side is positioned at the first half of horizontal-drive signal, and the 2nd pulse is positioned at the center, and the 3rd pulse is positioned at latter half.(e) part of Figure 84 is the luminescent waveform of pixel 1.The longitudinal axis is brightness.Suppose it is the white signal of D1=100% (255 grades).During the 1st " height " of sweep signal, pixel 1 is set at luminance (luminosity) L11 of D11 decision.At this moment instantaneous light emission brightness is 250 nits in above-mentioned example.The time point that drops to " low " in sweep signal keeps these data D11, thereby pixel 1 continues luminous with 250 nits.Then during the 2nd " height ", the pixel data of pixel 1 is write D12.In the above-mentioned example, the L12=1000 nit.Then, sweep signal drops to " low " once more, thereby keeps D12, and pixel 1 continues luminous with 1000 nits.Equally, in the 3rd scanning impulse, write and keep being equivalent to the L13=250 nit of D13.In a word, in the present embodiment, be the timing of " height " according to sweep signal of Figure 84 (d) part, setting is equivalent to the luminosity of video data of (c) partial data signal of Figure 84.

For example, if be EL element, the voltage of then video data being used as capacitor is kept, and circulation is equivalent to the electric current of this voltage in EL element, makes EL element luminous.If liquid crystal cell then is used as video data as electric charge and kept, and liquid crystal is modulated into the transmissivity that matches with this electric charge.

L11, the L12 of (c) part of Figure 84, L13 be L11=L13 and L12 for example〉L11.Luminous by being undertaken by this waveform, Fig. 8 explanation that obtains embodiment 1 time improves the effect of hangover amount and flicker amount.The duty factor D of the 1st luminous component of Fig. 1 explanation is by the impulse phase decision of the sweep signal of the alternation sum correspondence of data-signal.Division methods (ratio) decision that luminous strength ratio S is divided by the video data of D11, D12, D13.Figure 84 (f) part and (g) part the situation of concern as the pixel 3 of another pixel is shown.Division is written to the video data that obtains behind the video data D3 that pixel 3 shows is expressed as D31, D32, D33.And, the luminosity corresponding with each data is taken as L31, L32, L33.

Pixel 3 is in center Screen.The work timing of this pixel is identical with pixel 1 basically, and phase place then is offset 2 row.Therefore, the sweep signal of each pixel is not " height " simultaneously.

Like this, the device for video display of present embodiment will be applied to the data interlace on the data electrode in advance, be processed into 3 data of each horizontal cycle configuration.And, the sweep signal of carrying out the selection of vertical direction, 3 " height " signals of each vertical synchronizing signal output.A plurality of sweep signals do not form " height " simultaneously.

By writing data by such timing, the device for video display of present embodiment is obtained the luminescent waveform shown in (e) part of Figure 84.This luminescent waveform comprises the 1st luminous component shown in Figure 1 and the 2nd luminous component.Perhaps comprise intermittently luminous component and lasting luminous component.By making pixel luminous, implement the ideal of hangover amount and flicker amount and improve by this waveform.

In the present embodiment, because by storer externally being set with data interlace, the control luminescent waveform needn't for example add scan electrode etc., upgrade the pixel of the general composition change display board of 1 secondary data from each vertical synchronizing signal and form, can continue to use existing display board.

And the intermittently duty factor of luminous component is controlled in the staggered management of data available signal.Intermittently the luminous phase place of luminous component too the staggered management of data available signal control.

Embodiment 19

With Figure 85 to Figure 100 another embodiment of the present invention is described.The top condition of the luminous strength ratio S of the 1st luminous component of (a) part explanation of Figure 61 of present embodiment explanation embodiment 14 and the duty factor D of the 2nd luminous component and the 1st luminous component.That is, the described composition of present embodiment is a composition of obtaining the effect of forming shown in the embodiment 14～18 better.Model according to Figure 65 explanation is calculated the hangover amount that illustrates later.

The brightness change threshold that calculates hangover amount usefulness is taken as 15%, 85%.This threshold value does not have absolute value, but change by the screen intensity of device for video display and screen scale etc.Here (e) that suppose Figure 65 arrives 15% of overall brightness variation greatly even the brightness of the oblique line 1 of part explanation and oblique line 3 regulations changes, and be also not remarkable in the human eye.The flicker amount is calculated according to the Fourier transform of luminescent waveform, and is illustrated as Figure 66.

Figure 85 (a)～Figure 85 (c) illustrates luminous strength ratio S is fixed as 70% or 90% o'clock the duty factor D and the relation of hangover amount and flicker amount.When duty factor D equaled luminous strength ratio S, luminescent waveform was a direct current, thereby Figure 85 gets rid of it.Duty factor D is during greater than luminous strength ratio S, and the instantaneous light emission intensity of the 1st luminous component is less than the instantaneous light emission intensity of the 2nd luminous component, and so the effect category of the non-explanation present embodiment of this situation is with its eliminating.

Shown in Figure 85 (a), duty factor D＜luminous intensity S and luminous strength ratio is fixed as 70% or 90% and when calculating the hangover amount of model representation shown in Figure 65 and the flicker amount shown in Figure 66 with the duty factor D that obtains, the characteristic that its characteristic departs from prior art to whole duty factor D to moving, distinguishes that the device for video display of present embodiment is obtained the effect that reduces hangover amount and flicker amount simultaneously toward the lower left.

Figure 86 (a)～Figure 86 (c) illustrates luminous strength ratio S is fixed as 10% or 70% o'clock the duty factor D and the relation of hangover amount and flicker amount.Shown in Figure 86 (a), distinguish duty factor D＜luminous strength ratio S and duty factor D is fixed as 10% or at 70% o'clock, certain luminous strength ratio (being 70% here) is obtained the effect that reduces hangover amount and flicker amount simultaneously to the luminous strength ratio S less than 100%.

Figure 87 (a) and Figure 87 (b) illustrate luminous strength ratio S are fixed as 40% o'clock the duty factor D and the relation of hangover amount and flicker amount.Can not get the effect of the device for video display of present embodiment under this condition.In the explanation of Figure 86 (a), luminous strength ratio S is taken as up to 70%, its reason is that the combination of luminous strength ratio D and duty factor S does not have the effect that reduces hangover amount and flicker amount simultaneously sometimes.

In this oblique line 1,2,3 because of the explanation of Figure 65 (e) part, according to the combination of S and D, the brightness of the slope of oblique line 1,3 regulation sometimes changes above threshold value 15%, 85%, thereby the hangover quantitative change is big.So, in the present embodiment, get rid of the situation of luminous strength ratio S=40%.

Figure 88 (a) and Figure 88 (b) illustrate luminous strength ratio S are fixed as 60% o'clock the duty factor D and the relation of hangover amount and flicker amount.Under this condition,, exist to have the situation of the effect that reduces hangover amount and flicker amount simultaneously and the situation of not having that effect according to duty factor D.

Conclude the characteristic of Figure 85 to Figure 88, the condition that then has the duty factor D of effect of present embodiment and luminous strength ratio S is shown in Figure 89.Among Figure 89, transverse axis is duty factor D, and the longitudinal axis is luminous strength ratio S.

Duty factor D and luminous strength ratio S satisfy the condition A of 62≤S＜100 and 0＜D＜100 and D＜S or the condition B of 48＜S＜62 and D≤(S-48)/0.23.Among Figure 89, the zone that mesh point is represented is the zone of A of satisfying condition, and the zone that oblique line is represented is the zone of B of satisfying condition.

The condition of S=100 means that the intermittence of carrying out prior art is luminous, so be not included among condition A and the condition B.The condition of S=D means the situation that the instantaneous light emission intensity of the 1st luminous component equates with the instantaneous light emission intensity of the 2nd luminous component, so be not included among condition A and the condition B.

The condition of S=0 or D=0 means that the 1st luminous component is 0, so be not included among condition A and the condition B.The condition of D=100 means that the 2nd luminous component is 0, so be not included among condition A and the condition B.

As illustrated with Figure 85, whole duty factor D that condition A obtains certain luminous strength ratio S obtain the effect that reduces hangover amount and flicker amount simultaneously.Illustrated as Figure 87, the D that condition A and condition B comprise, S value can not obtain the effect that reduces hangover amount and flicker amount simultaneously.Illustrated as Figure 88 (a), the scope of the luminous strength ratio S of the B that satisfies condition only obtains the effect that reduces hangover amount and flicker amount simultaneously under the situation of certain duty factor D.

Hangover amount when Figure 90 (a) and Figure 90 (b) illustrate luminous strength ratio S=62% and the relation of shrinking rule.In the case, distinguish to have the effect that the duty factor D that can get is reduced simultaneously hangover amount and flicker amount.Hangover amount when Figure 91 (a) and Figure 91 (b) illustrate luminous strength ratio S=48% and the relation of flicker amount.In the case, the duty factor D that does not have the effect that obtains present embodiment.According to Figure 88, Figure 90 and Figure 91, the luminous strength ratio S that distinguishes condition B is 48＜S＜62.

Figure 92 (a) and Figure 92 (b) utilize hangover model and scintillation analysis to calculate the upper limit that obtains the duty factor D of the effect that reduces hangover amount and flicker amount simultaneously in the scope of 48＜S%＜62.Luminous strength ratio S can roughly be similar to the straight line of S=0.23D+48 to the characteristic of duty factor D.If the duty factor D that duty factor is represented less than this near linear then obtains above-mentioned effect, thereby D≤(S-48)/0.23 is set at condition B.

Figure 93 (a)～Figure 93 (c) is hangover amount and the improvement degree of the flicker figure that use of explanation during from 6 representative points of extracted region of satisfy condition A and condition B.That is, shown in Figure 93 (a), extract some P1～P6.Figure 93 (b) illustrates D, the S value of each point.

Figure 93's (c) is to obtain hangover amount and flicker amount and hangover amount-flicker discharge curve is marked the figure of these P1～P6 of picture respectively according to the model shown in Figure 65.Shown in Figure 93 (c), the hangover amount of each point and flicker amount depart from the line of lighting (impulse type demonstration) intermittence of prior art, move toward the lower left.Therefore, we can say that hangover amount and flicker measure these two kinds of picture quality obstacles and improve simultaneously.

Figure 94 (a) and Figure 94 (b) illustrate a routine pixel luminescent waveform.Transverse axis is the time, and the longitudinal axis is an instantaneous light emission intensity, and the instantaneous light emission intensity of 1 cycle share is shown.The situation that Figure 94 (a) illustrates is because the dimming function (user is switched the function of the brightness of whole image) of device for video display and the control mode of device for video display, the sawtooth wave of superpose about 2.4 kilo hertzs (per 16.7 milliseconds are vibrated 40 times).

Because human eye can not be followed the tracks of the frequency of 2.4 kilo hertzs of repetitions, though this luminescent waveform also with the luminescent waveform equivalence shown in Figure 94 (b), obtain the effect of present embodiment, promptly improve hangover and flicker simultaneously.

Among Figure 61 etc.,, the waveform of the 1st luminous component and the 2nd luminous component is described with square wave for pixel fluorescent lifetime response wave shape illustrative ease to present embodiment.Yet, the invention is not restricted to this square wave.Illustrated as Figure 65, exist in the direction that departs from the original integration direction of human eye luminous problem of carrying out integration in the maintenance display device to pixel.For the eye tracking mobiles, produce integration route departing from toward this integration direction.Existing impulse type display device is divided luminous by suppressing portion, reduce the obstacle that trails, but present embodiment reduces the hangover amount again, improves the flicker amount again simultaneously.The luminescent waveform of present embodiment is by concentrating the luminous intensity (" luminous energy ") of luminous strength ratio S to form at duty factor D official hour.Therefore, much less, even non-its effect of pure square wave does not reduce yet.

Luminescent waveform when Figure 95 (a) illustrates the 2nd luminous component and is made up of burst pulse.Transverse axis is the time, and the longitudinal axis is an instantaneous light emission intensity, and the luminescent waveform of 1 vertical cycle share is shown.In the case, identical with Figure 94, human eye is not followed the tracks of burst pulse, thereby the luminous intensity of the 2nd luminous component and the luminescent waveform equivalence shown in the dotted line, can take into account the improvement of hangover and flicker.

(during 100-S) %, shown in Figure 95 (a), adjustable whole pulse is lighted time T 0, also can change pulse strength L0 as Figure 95 (b) to adjust the luminous strength ratio of the 2nd luminous component.

The repetition frequency of the 2nd luminous component can be selected the value that human eye is not followed the tracks of.For example can be such several kilo hertzs of the sawtooth wave of Figure 94, also can be several times of video vertical frequencys about 150 hertz.According to the characteristic and the view environment of the demonstration video of device for video display, sometimes 80 hertz frequency also can, also can for 100 hertz sometimes.For example screen intensity is in the device for video display of 250 nits, even the frequency about 120 hertz (being 2 times frequency of ntsc video signal), human eye also is identified as continuous light sometimes.For example screen intensity is in the device for video display of 500 nits, and 120 hertz are felt to glimmer sometimes, and the frequency that must be not less than 300 hertz sometimes just is identified as continuous light.The video that device for video display shows is under the many situations of rest image, and screen intensity changes slightly and will regard obstacle as sometimes, and under the many situation of live image, does not mind picture change to a certain degree sometimes.In a word, can suitably select the frequency that exists in system's composition of device for video display.

Figure 96 illustrates the situation that response wave shape is a triangular wave of lighting of pixel.Transverse axis is the time, and the longitudinal axis is an instantaneous light emission intensity, and the luminescent waveform of above-mentioned 1 vertical cycle share.Under the situation of this luminescent waveform, be used as and the luminescence response equivalence shown in the dotted line.When the luminescent waveform of Figure 96 is applied to the illustrated model of Figure 65, though oblique line 1,3 of Figure 65 (e) part is not a straight line and present curve, but the oblique line 2 that docks with oblique line 1 and oblique line 2 is determined by the duty factor D and the luminous strength ratio S of the 1st luminous component and the 2nd luminous component, thereby can improve hangover and these two picture quality obstacles that glimmer simultaneously.

Figure 97 illustrates the situation that luminescence response is an exponential function, but at this moment identical with Figure 96, also with the characteristics of luminescence equivalence shown in the dotted line, can obtain the effect of present embodiment.

Like this, the duty factor D of the 1st luminous component and the 2nd luminous component and the relation of luminous strength ratio S satisfy above-mentioned condition A or condition B, and then its luminescent waveform is which kind of all can.

The instantaneous light emission intensity of the 1st luminous component is greater than the instantaneous light emission intensity of the 2nd luminous component, but in the scope that for example can ignore the pixel overall brightness, the instantaneous light emission intensity of the 1st luminous component also can less than the instantaneous light emission intensity of the 2nd luminous component.That is, during the luminescent waveform vibration, also can there be the situation of the instantaneous light emission intensity of the 1st luminous component in a part of vibration peak less than the instantaneous light emission intensity of the 2nd luminous component.If Figure 94 (a) and Figure 94 (b) equivalence be illustrated, but when the luminescent waveform of Figure 94 (a) was replaced as the luminescent waveform of Figure 94 (b), the instantaneous light emission intensity of the 1st luminous component can be greater than the instantaneous light emission intensity of the 2nd luminous component.

In the above description, the definition with the hangover amount is taken as 15% to 85% brightness variation range.Here, when for example the screen intensity of device for video display being set at the brightness value of 600 nits and view environment when dark, under the condition of bigger duty factor D of the slope ratio of the oblique line 1,3 of Figure 65 (e) part explanation and luminous strength ratio S, sometimes visible this oblique line 1,3 of observer makes hangover improve effect and reduces.In this case, can set the luminescence response waveform in the scope of the condition that satisfies the duty factor D shown in Figure 98, luminous strength ratio S.

The brightness level range that Figure 98 illustrates the hangover of hypothesis human eye response is to obtain the duty factor D and the luminous strength ratio S of the effect that reduces hangover amount and flicker amount simultaneously at 10% to 90% o'clock.

At this moment, D and S satisfy 79≤S＜100 and 0＜D＜100 and the D＜S as condition A1, or satisfy 69＜S＜79 and D≤(S-69)/0.127 as condition B1.Among Figure 98, the part of representing with mesh point is condition A1, and the part of representing with oblique line is condition B1.

Figure 99 (a)～Figure 99 (c) illustrates among condition A1 shown in Figure 98 or the condition B1 and S to be fixed as 70 or 80 o'clock the hangover amount and the relation of flicker amount.Shown in Figure 99 (a), during S=80, has regardless of duty factor D the effect that hangover amount and flicker amount are reduced simultaneously.During S=70, only has above-mentioned effect under the situation of D=10

Figure 100 (a) and Figure 100 (b) utilize hangover model and scintillation analysis to calculate the upper limit that obtains the duty factor D of the effect that reduces hangover amount and flicker amount simultaneously in 69＜S＜79 scopes shown in the condition B1 of Figure 98.

Luminous strength ratio S can roughly be similar to the straight line of S=0.127D+69 to the characteristic of duty factor D.If duty factor less than this duty factor D, then obtains the effect that reduces hangover amount and flicker amount simultaneously, thereby D≤(S-69)/0.127 is set at condition B1.

In sum, be set at certain condition, can obtain the effect of improving hangover amount and flicker amount simultaneously the pulsed illumination technology of prior art by duty factor D and luminous intensity S with the 1st luminous component.The screen intensity of device for video display improves, and then perceives flicker (Ferry-Porter rule) easily.Therefore, in the existing intermittence lighting mode, during with the high brightness display image, be easy to generate the flicker obstacle.The body of rod of the cellula visualis of human eye than cone to the light on and off sensitivity, promptly the periphery of visual field than the center to the light on and off sensitivity, so that the display board of device for video display when maximizing, identification flicker obstacle easily.Therefore, to be used to improve the picture quality of device for video display of high brightnessization and giant-screenization especially effective for the display quality improvement method of the device for video display of present embodiment.

The condition of duty factor D that illustrates among Figure 89 and luminous strength ratio S is replaced as hangover amount and flicker amount and obtains after simple model calculates.The picture quality of device for video display depends on that the degree of observer's subjectivity is big, and arranged by view environment, so be difficult to quantize, but inventor etc. confirm that condition and the evaluation result difference of utilizing model to obtain are little in the subjective assessment experiment based on the condition of obtaining.

The condition of duty factor D that illustrates among Figure 89 and luminous strength ratio S is replaced as hangover amount and flicker amount and obtains after simple model reduces to calculate, as the condition of this simple model, and the hangover amount when supposing white movement of objects and show flicker amount when white.On the other hand, there is 100% white signal hardly in the video of rating usually.Therefore, device for video display for screen intensity 500 nits, the average level of the video of actual displayed is 50%, then can be for example the screen intensity equivalent replacement of device for video display is 250 nits (=500/2) and obtains the value of optimum load than D and luminous strength ratio S.At this moment, can determine the value of D, S according to the histogram information such as (video data distributions) of the video that shows.Perhaps also can constitute from incoming video signal and detect video characteristic quantities such as the histogram of brightness and average level automatically, and the characteristics of luminescence of automatic switchover pixel.

60 hertz of components that are used as 1 subharmonic are judged the flicker amount.In fact produce the higher hamonic wave of 60 hertz integral multiple, but inventors etc. utilize experimental verification only to pay close attention to 60 hertz of components and it is suppressed to get final product.For example because giant-screenization and high brightnessization, may produce the situation that 120 hertz higher hamonic wave also is identified as obstacle, but at this moment, as indicated above, can make Fourier transform to luminescent waveform, one side is paid close attention to 60 hertz and 120 hertz of these two components, and one side is obtained duty factor D and luminous strength ratio S.

Present embodiment is used as vision signal as the TSC-system signal and is illustrated, but present embodiment also is fit to the situation of the vision signal of demonstration personal computer.For example the vertical frequency of device for video display is under the situations such as 75 hertz, and human eye sensitivity is low during than 60 hertz, corresponding the reducing of flicker amount of observer's sensation, but according to conditions such as screen intensitys, still observing flicker sometimes becomes obstacle.At this moment, can pay close attention to 75 hertz of components, and as present embodiment, obtain the condition of duty factor D and luminous strength ratio S.

The situation of 15%, 85% the threshold value definition hangover that present embodiment changes with brightness the relation of duty factor D, luminous strength ratio S has been described with Figure 89.With Figure 98 situation with the definition of 10%, 90% threshold value has been described again.Yet, the absolute value of unique absolutely not definite threshold value.This is because the picture quality of device for video display is subjected to the subjective domination of observer.And view environments such as illumination on every side, viewing distance also change.The image that shows is that rest image or live image aspect also change.In a word, can in the multiple application of device for video display, determine optimum value at every turn, and carry out qualitative, quantitative evaluation, carry out work by final subjective assessment with the method for present embodiment explanation.

Also can detect the average level of display image, and dynamically or the parameters such as luminous phase place of adaptive control duty factor D, luminous strength ratio S, the 1st luminous component.Can carry out these parameter control according to the histogram of image.Also can use action messages such as interframe difference.Also can obtain illuminance information and control from the illuminance transducer of measuring the illumination around the device for video display.Also can use their time fluctuation information.Brightness maximal value, the minimum value that also can use the video of demonstration to comprise.Also the activity of image can be gone out as vector detection, and control according to this information.Also can link, and control by each different parameter with the function of observer toggle screen brightness.Also can detect total power consumption of device for video display, and parameter is controlled, to reduce power consumption.Also can detect the continuous operation time after the energized, and reduce the such parameter control of screen intensity when lighting for a long time.

According to the 1st luminous component and these two kinds of luminous components of the 2nd luminous component the pixel luminescent waveform of present embodiment has been described, but has been not specifically limited to two kinds.According to the modulating part of pixel, control respectively by defining the 3rd luminous component separately sometimes, can obtain optkmal characteristics.Can define the 4th luminous component, the 5th luminous component sometimes.At this moment, in the model of Figure 65 explanation, be divided into a plurality of luminescent waveforms in the setting of Figure 65 (a) part, set the video information that shows in Figure 65 (b) part, calculate the brightness change information of (c) vertical direction partly of Figure 65, and carry out integral operation toward the direction of arrow No.1 2, then obtain suitable hangover brightness and change waveform.Under 3 kinds or the more luminous situation, with the model of present embodiment, also can analyze, and can derive best operating condition according to this analysis result.

Have the time and go up the limited response time if implement the luminous element of pixel, can Figure 65 (a) part or (b) part add this of information time response.Can analyze it according to the item that illustrates in the above-mentioned present embodiment, thereby can derive best operating condition.

Moreover, in the present embodiment, use the ratio definition flicker amount of direct current with 1 subharmonic of Fourier transform results.Here, can import absolute value, and each absolute value carries out the weighting of higher hamonic wave ratio.This absolute value is equivalent to for example average screen brightness of device for video display.The screen intensity distinctness then changes according to mean flow rate, makes to allow flicker quantitative change little (becoming the condition strictness) etc.Therefore, likening to the function of screen intensity of direct current and 1 subharmonic handled, the precision of then flicker amount further improves.Mode in also available company 2 subharmonic are also contained in defines the flicker amount.

Embodiment 20

Present embodiment is used to illustrate that the circuit that the device for video display of realizing the respective embodiments described above is used forms.That is, the circuit of the device for video display by adopting present embodiment is formed, and obtains the waveform (back detailed description) of the instantaneous light emission brightness shown in (a) part of Figure 54.This brightness waveform such as enforcement mode 11 and Figure 53 are illustrated, are equal to the brightness waveform that the 1st luminous component and the 2nd luminous component are formed.Therefore, the circuit of the device for video display by adopting present embodiment is formed, and can realize the device for video display that sends the 1st luminous component and the 2nd luminous component that illustrates in the respective embodiments described above.

Shown in Figure 39 and Figure 61, the brightness waveform that this 1st luminous component and the 2nd luminous component are formed is in fact with luminous component intermittently with continue the brightness waveform equivalence that luminous component is formed.Therefore, the circuit of the device for video display by adopting present embodiment is formed, and that can realize illustrating in the respective embodiments described above sends luminous component intermittently and continue the device for video display of luminous component.

The principle of the LCD (device for video display) of present embodiment at first, is described with Figure 101～Figure 108.Secondly, the conversion example of the LCD of present embodiment is described with Figure 109～Figure 113.

The principle of the LCD of present embodiment

Figure 101 is the block diagram that the LCD of a routine present embodiment is shown.Shown in Figure 101, the LCD of present embodiment has video signal input terminal 2001, control circuit 2002, source electrode driver 2003, gate drivers 2004 and liquid crystal board 2005.Source electrode driver 2003 connect source electrode line s0, s1, s2 ..., s10, gate drivers 2004 connect gate line g0, g1, g2 ...And, at each intersection point formation liquid crystal cells (not shown) of source electrode line and gate line.Liquid crystal cells is subjected to scanning all to change the optical transmission rate according to vision signal at every turn.The LCD of present embodiment also has luminous power input terminal 2006, power circuit 2007, lamp 2008i, light guide plate 2009a, lights signal generating circuit 2010a and switch 2011.

Control circuit 2002 outputs to vertical synchronizing signal vs and lights signal generating circuit 2010a, lights signal generating circuit 2010a and will light signal p0～p3 and output to switch 2011.Switch 2011 makes the power conducting or the blocking-up that are added to lamp 2008i from power circuit 2007 according to the signal level of lighting signal p0～p3.

Light guide plate 2009a and gate line g0～g7 are divided into a plurality of rectangle regions abreast.In the composition shown in Figure 101, light guide plate 2009a is divided into 4 zones of district L0～L3.The pixel of district L0 illumination gate line g0, g1 scanning.Thereafter identical, the pixel of district L1 illumination gate line g2, g3 scanning.The pixel of district L2 illumination gate line g4, g5 scanning.The pixel of district L3 illumination gate line g6, g7 scanning.Independently control and respectively distinguish lighting, extinguishing of L0～L3 by lighting signal p0～p3 accordingly.

The omission of dividing the zone of light guide plate is not limited to identical with the bar number of gate line.For example in the composition of Figure 101, light guide plate is divided into 4 districts, but gate line is 8.The lamp in 1 district of illumination is not limited to 1.In the composition of Figure 101,1 district of 2 lamp illuminations.

Figure 102 is that one of the signal generating circuit 2010a that lights of the LCD of Figure 101 forms example (" embodiment 20 1 ").Shown in Figure 102, light input terminal 2101, counter 2102 that signal generating circuit 2010a has vertical synchronizing signal vs, light constantly set parts 2103r, extinguish constantly set parts 2103f, consistance comparer (Equality Comparator) 2104r and 2104f, SR multiplier 2105, light signal p0～p3 lead-out terminal 2106 ..., keep set parts 2107 and the delay circuit 2108 of the time of 1/4th frames.Among Figure 102, the dotted line that indicates reference number 2109 represents that the scope of this dotted line is identical circuit unit.

Among Figure 102, apply hachure on set parts 2103r, the 2103f, 2107.Among Figure 102, thin wires is represented 1 signal line, and the coarse cloth line represents that length is not less than 1 bus.Vertical synchronizing signal vs is taken as negative logic (be longer than during " height " " low " during).Among Figure 102, omit power supply, GND terminal and clock line.

Counter 2102 is by the pulse zero clearing of vertical synchronizing signal vs.That is, counter 2102 and vertical synchronizing signal vs synchronous operation.The O of the input terminal of counter No. 2102 expression carried out work by negative logic.

Set parts 2103r and 2103f have the function regularly of lighting that keeps lamp 2008i.When the output valve of counter 2102 was consistent with the setting value of regulation, 2 consistance comparer 2104r and 2104f outputed to SR multiplier 2105 with pulse.Luminosity by the load factor decision lamp of the output signal of SR multiplier 2105.

Circuit unit 2109 co-exists in 4 systems.Set parts 2107 and delay circuit 2108 have the function of the work timing of each system of decision.4 circuit units 2109 are kept the phase differential of 1/4th frames, parallel running.

Available cross-over connection resistor, DIP switch, ROM, register etc. are realized set parts 2103r, the 2103f, 2107 of Figure 102.These set parts are not shown in Figure 102.The deviser of display device, producers, setter or observer etc. can be according to the hobbies of purposes, video signal source or observer etc., by changing parameter regulation that these set parts keep to optimum picture quality.

The signal generating circuit 2010a that lights shown in Figure 102 is produced and the synchronous pulse signal i0～i3 of vertical synchronizing signal vs.Shown in Figure 102, light set parts 2203a that signal generating circuit 2010a has the count cycle of counter 2202p, counter 2202p, light constantly set parts 2203r, extinguish set parts 2203f, consistance comparer 2204a and 2204r and 2204f, SR multiplier 2205, OR-gate 2110 constantly ...

Counter 2202p can't help vertical synchronizing signal vs zero clearing, and replaces the output signal zero clearing by consistance comparer 2204a.Counter 2102 is by negative logic work, and counter 2202p presses positive logic work, but the invention is not restricted to such logic polarity.

Need and to set to such an extent that be higher than the critical fusion frequency CFF that can not see flicker to the frequency (being count frequency) of counter 2202p zero clearing.Count frequency can be the integral multiple of vertical frequency, also can be non-integral multiplely, and intermodulation takes place as long as determine to such an extent that do not interfere with horizontal frequency.

Current, CFF is higher than vertical frequency.Therefore, the count cycle of the counter 2202p of Figure 102 is shorter than the cycle of counter 2102.So, can make the position length of counter 2202p long in the position of counter 2102.Thus, suppress the LCD circuit scale increase of present embodiment.

Set parts 2203r and consistance comparer 2204r by Figure 102 set up lighting regularly of lamp, and set parts 2203f and consistance comparer 2204f then set up extinguishing regularly of lamp.The timing of lighting, extinguish of setting up like this is sent to SR multiplier 2205.Then, the output signal h with SR multiplier 2205 outputs to OR-gate 2110 ...

Because counter 2202p is not subjected to vertical synchronizing signal vs zero clearing, output signal h and pulse signal i1～i3 export not according to fixed skew (mistiming).That is, output signal h and pulse signal i0～i3 are in asynchronous relation.

OR-gate 2110 ... get with the logic of the synchronous pulse signal i0～i3 of vertical synchronizing signal vs and the high-frequency signal h that is higher than CFF and, output to the lead-out terminal 2106 of lighting signal p0～p3 ...

Figure 103 is the figure that the work wave of lighting signal p0～p3 of vertical synchronizing signal vs, pulse signal i0～i3, high-frequency signal h and lamp is shown.Shown in Figure 104, to gate line g0～g7, the line output of lighting signal p0～p3 and the synchronous pulse signal of vertical synchronizing signal vs.Among Figure 104 for convenience of description, 4 g0, g2, g4, g6 among 8 the gate line g0～g7 that only draw.Consider the response time of liquid crystal molecule and the sweep time of grid, light the on-off timing of signal p0～p3 with decision.

Shown in Figure 103,1 subpulse signal i0～i3 takes place in 1 vertical cycle, and repeatedly high-frequency signal h takes place 1 vertical cycle.The signal p0 that lights of lamp is the signal that obtains after pulse signals i0 and high-frequency signal h synthesize.Equally, the signal p1 that lights of lamp is the signal that obtains after pulse signals i1 and high-frequency signal h synthesize, the signal p2 that lights of lamp is the signal that obtains after pulse signals i2 and high-frequency signal h synthesize, and the signal p3 that lights of lamp is the signal that obtains after pulse signals i3 and high-frequency signal h synthesize.

Figure 105 be illustrate Figure 101 light guide plate 2009a district L0～L3 luminescent waveform and be added to the figure of waveform of the power P of power circuit 2007 from luminous power input terminal 2006.Represent corresponding luminous of pulse i0～i3 with Figure 103 with the part of thick line hatching among Figure 105, represent corresponding luminous of high-frequency signal h with Figure 103 with the part of fine rule hatching among Figure 105.Shown in Figure 105, the fluorescent lifetime of pulse signal i0～i3 (pulse width) is longer than the fluorescent lifetime (pulse width) of high-frequency signal h usually.

, (brightness that is the light sent out of light guide plate (the district L0 of Figure 101～L3)) is directly proportional with the mean value of this luminescent waveform to remove back-lighting monomer behind the liquid crystal board.In the present embodiment, the mean value of luminescent waveform is directly proportional with its load factor (lighting the time).Therefore, can make the luminance standard value of display device identical again, make the load factor of pulse signal i0～i3 (with reference to Figure 103) only dwindle the share of adding high-frequency signal h (with reference to Figure 103) again.

Figure 106 is the figure of the deep or light usefulness of live image profile that shows of the LCD of explanation present embodiment.Long pulse of the time interval in (a) part of Figure 106 is and the corresponding luminous part of pulse signal i0～i3 of Figure 103 that the burst pulse of (a) part of Figure 106 is the part corresponding with the high-frequency signal h of Figure 103.

Ladder 1 of (e) part of Figure 106 and ladder 3 are because people's mobiles eyesight is difficult to identification, and nonrecognition is that live image is fuzzy.The mobiles eyesight can not be differentiated this image detail.Its result only is identified as precipitous oblique line 2 profile of live image.Object is static, and then ladder 1 and ladder 3 disappear, thereby static eyesight also is not aware of ladder.Therefore, after object stops also can with stop before identical luminescent waveform continue to light back-lighting.

So, distinguish that the influence of high-frequency signal h appears at the two ends of profile (ladder 1 and the ladder 3 of (e) part of Figure 106), the display quality of live image profile improves.

Figure 107 is the result of calculation of fourier series of luminescent waveform (with reference to Figure 108) of the district L0 of the luminescent waveform (with reference to Figure 105) of district L0 of LCD of present embodiment and prior art.The I part of Figure 107 is identical with the luminescent waveform of the district L0 shown in Figure 105, and the II part of Figure 107 is identical with the luminescent waveform of the district L0 shown in Figure 108.The III of Figure 107 partly is the higher harmonic components of the luminescent waveform of present embodiment and existing example district L0 separately.

The maximum reason that causes flicker is 1 subharmonic, i.e. the frequency component identical with vertical frequency.The non-reason that causes flicker of DC component.As the reason that produces flicker, 2 times or more higher harmonic components also can ignore.

Because the degree of flicker obstacle depends on display brightness, the III of Figure 107 partly makes present embodiment consistent with the mean value of waveform in the existing example.Under this condition, compare the size of both 1 subharmonic.

Shown in the III part of Figure 107,1 subharmonic of the luminescent waveform of present embodiment and existing example is respectively 0.820 and 1.277.This means that the former is reduced than latter's (promptly existing example) flicker (being present embodiment).

2 times or more higher harmonic components can roughly ignore the influence of flicker, thereby the frequency of high-frequency signal h preferably is not less than 2 times of vertical frequencys.

In the present embodiment, the luminous component corresponding with high-frequency signal h carries out light on and off with the frequency that is higher than critical fusion frequency, thereby the non-reason that causes flicker.Yet high-frequency signal helps the luminosity of back-lighting.

That is, the luminous of high-frequency signal h perceiveed easily.Make the corresponding reduction of the pairing luminosity of pulse signal i0～i3.Thereby, can suppress the flicker obstacle.

It is luminous that high-frequency signal h luminous can be described as the simulation maintenance.Therefore, the luminescent waveform of hereinafter that high-frequency signal h is such control signal or this signal is called simulation and keeps pulse.

According to present embodiment, the output light of multiple lamp (being impulse type alight and maintenance alight) is mixed.Therefore,, according to present embodiment, obtain and be difficult to cause uneven luminance and colored irregular advantage.

And, the easy control figure circuit of switch, the not power consumptions of the break-make of switch own.When for example carrying out the switch switching with bipolar transistor,, do not produce big collector dissipation in saturation region and blocking-up district.Therefore, according to present embodiment, not only do not need the heat dissipation design of heat radiator etc., and can help the low consumption electrification.

Its reason is identical with D level amplifying circuit efficient height.But the present invention is not with the dimming light sources of D level amplification to display device, but relates to the light source control method of the characteristics of effectively utilizing the amplification of D level.

Present embodiment is only revised the existing signal generating circuit of lighting, thereby the cost of existing example improves a little.Peripheral along large-scale components such as light guide plate 2009a, switch 2011 constant power circuit that gate line is divided according to the member that is the cost cost, but the energy former state is continued to use the basis among the existing LCD.

Present embodiment can be divided light guide plate.That is, in the present embodiment, light guide plate can be divided into a plurality of districts, and with each district of lamp illumination of the system that separates.

That is, can constitute a plurality of lamp 2008i are divided into 4 systems,, and independently control the light on and off of respectively distinguishing L0～L3 with lighting signal p0～p3 with district L0～L3 of illumination light guide plate 2009a.Also can be according to the independent control wave i0～i3 of the timing rising timing separately of scanning realization in the liquid crystal board 2005.

The system quantity of dividing light guide plate 1009a is not limited to 4.The quantity of the lamp in 1 district of illumination also is not limited to 2.

Another lights signal generating circuit embodiment

Figure 109 is another embodiment that lights signal generating circuit 2010a (as " embodiment 20 2 ") of Figure 101.With the difference of the composition shown in Figure 102 be: 2 set parts 2203a, 2203r are merged into 1 set parts 203,2 consistance comparer 2204a, 2204r are merged into 1 consistance comparer 2204.The counter 2202p of Figure 109 carries out zero clearing with the positive logic output signal of consistance comparer 2204.Yet its function is identical with Figure 102's.Among Figure 109, have the reference number identical according to mark with Figure 102 identical functions and composition.

Embodiment 22 in, set parts 203,2203f can adjust cycle and the load factor of analog pulse signal h respectively.Simulation keeps the phase place of pulse signal h not adjust.Yet it is and the high-frequency signal of the asynchronous generation of vertical synchronizing signal vs that picture quality does not change because of its phase place, so no problem fully that simulation keeps pulse signal h.

According to 2 of the embodiment shown in Figure 109 20, can further suppress to light the scale of signal generating circuit 2010a than 1 (Figure 102) of embodiment.That is, according to 2 of embodiment 2, can quantity 1 set parts 2203a and consistance comparer 2204a, the 2204r of embodiment 20.

Figure 110 is the another composition example of lighting signal generating circuit 2010a (as " embodiment 20 3 ") of Figure 101.With the difference of lighting signal generating circuit 2010a shown in Figure 109 be: the dimming function that adds PWM (width modulation) mode.

Under the too dazzling situation of video, when reducing the amplitude of vision signal, produce and squeeze black and quantizing noise strengthens.In order to prevent this point, reduce the output of the lamp that display device has usually.Do not take into account image quality improvement and dimming function, then the commodity value of display device is impaired.Therefore, 3 of embodiment 20 take into account image quality improvement and dimming function.

Shown in Figure 110,3 the signal generating circuit 2010a that lights of embodiment 20 has with counter 2302p, the count cycle of positive logic signal zero clearing and lights constantly set parts 2303, extinguishes set parts 2303f, consistance comparer 2304 and 2304f and SR multiplier 2305 constantly.Light signal generating circuit 2010a and also have AND gate 2111 ...Has the identical numbering of member mark with Figure 109 identical functions and composition.

SR multiplier 2305 outputs to AND gate 2111 with PWM dim signal d ..." with door " 2111 got PWM dim signal d and OR-gate 2110 ... the logic product that signal is shown, its result is outputed to the lead-out terminal 2106 of lighting signal p0～p3 ...

The generation circuit of PWM dim signal d is similar to the generation circuit that produces pulse signal i0～i3 and keep pulse signal h.Yet the frequency of each signal is different fully with function.

That is, pulse signal i0～i3 is the signal of frequency identical with vertical synchronizing signal vs (for example 60 hertz).It is the signal that frequency is higher than critical fusion frequency CFF (for example 600 hertz) that simulation keeps pulse signal h.PWM dim signal d is the signal that frequency fully is higher than analog pulse signal h (for example 600 kilo hertzs).Therefore, counter 2302p the position long can be shorter than counter 2102 sum counter 2202p the position long.

Figure 111 is the figure of the work wave of circuit each several part that Figure 110 is shown (be vertical synchronizing signal vs, pulse signal i0, simulation keep pulse signal h, PWM dim signal d, lamp light signal p0).PWM dim signal d and lamp are lighted signal p0 extract its part, and draw in the mode of amplification time axle.

With the load factor that set parts 2303,2303f dwindle PWM dim signal d, then can keep pulse signal i0～i3 and simulation and keep the relation between the pulse signal h constant, just can reduce the light modulation of lamp, and it is constant to keep display quality.

Make for example high 3 orders of magnitude of frequency of the frequency ratio simulation maintenance pulse signal h of PWM dim signal d, even if then do not manage the phase place of PWM dim signal d, the light modulation error also is enough to be not more than 0.1% (1/1000).Certainly, PWM dim signal d luminous do not become and causes the reason of glimmering.

Generation circuit to PWM dim signal d is supplied with for example clock signal of the frequency of 100 times of PWM dim signal d (i.e. 60 megahertzes), then can do 100 grades of light modulations, can finish superfine light modulation.

Each signal of more than enumerating is an example only.Yet, use the technology of today, the value of any frequency can both realize with rational cost.

Like this, according to 3 of embodiment 20, can realize simultaneously that image quality improvement and dimming function improve.And, than regulating impulse signal i0～i3 and simulation keep the load factor of pulse signal h easy respectively.

Figure 112 is the another composition example of lighting signal generating circuit 2010a (as " embodiment 20 4 ") of Figure 101.And the difference of Figure 109 is: add logic gate 2212 between the input terminal 2101 of vertical synchronizing signal vs and consistance comparer 2204 sum counter 2202p.Utilize this change, the output of the pulse of vertical synchronizing signal vs and consistance comparer 2204 can both be to counter 2202p zero clearing.Among Figure 112, mark identical reference number to having with the member of Figure 109 identical functions and composition.

The polarity of signal does not limit the present invention.Can select suitable logic gate according to the polarity of each signal.

Embodiment 20 4 in, with the impulsive synchronization of vertical synchronizing signal vs ground with counter 2202 zero clearings.Thus, make the device of circuit become easy.And the IC that can reduce the staff dispatches from the factory the required time of pattern (test board) that test is used.Produce malfunction even light signal generating circuit 2010a, also can in 1 frame, make it recover operate as normal reliably because of instantaneous power failure.Thereby, reduce observer and wait the time of by the time recovering operate as normal from malfunction takes place.

Embodiment 20 4 in, if make simulation keep the cycle of pulse signal h fully short, then can ignore the influence of inserting 2212 pairs of picture qualities of logic gate in fact with respect to vertical cycle.If if the frequency of consistance comparer 2204 output pulses fully is higher than the frequency (=vertical frequency) of the pulse of vertical synchronizing signal vs, 2 (Figure 109) of embodiment 20 almost do not have difference with the picture quality of 4 (Figure 112) of embodiment 20.

Figure 113 is the another composition example of lighting signal generating circuit 2010a (as " embodiment 20 5 ") of Figure 101.This example is replaced as totalizer 2113 with 2 the delay circuit 2108 (with reference to Figure 109) of embodiment 20.5 light among the signal generating circuit 2010a of embodiment 20, counter 2102 is 1, and is irrelevant with system quantity (quantity of circuit unit 2109).5 the function of lighting signal generating circuit 2010a of embodiment 20 and output waveform and embodiment 20 2 to light signal generating circuit 2010a identical.

Adopt 5 of embodiment 20, when then for example be constant time delay, the quantity of counter 2102 was 1 and gets final product, thereby can make circuit scale reducing than Figure 109.

Illustrated as mentioned, according to present embodiment, can suppress live image profile obstacle again, reduce flicker again.Can reduce flicker, then eliminate 1 obstacle that hinders display device maximization and high brightnessization.And according to present embodiment, the cost that realizing reduces to glimmer brings increases few.Though some increases the scale of signal circuit, somewhat expensive big member and power circuit almost former state use existing.Again, the characteristics of effectively utilizing the D level to amplify, efficient height.Present embodiment can be installed dimming function.

In order to solve above-mentioned problem, device for video display of the present invention, by brightness according to the vision signal modulated pixels, show video, send the time of the D% of the vertical cycle that occupies described vision signal, and have the 1st luminous component of the luminous intensity of the S% of the luminous intensity of the pixel of demonstration in this vertical cycle; And occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %, the value of described D and S satisfies following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23.

In the above-mentioned composition,, represent luminous strength ratio with S with the duty factor that D represents the 1st luminous component and the 2nd luminous component.Researchs such as the inventor change duty factor D and luminous strength ratio S and the hangover amount and the flicker amount that obtain, and the experience that the result obtains is: by setting duty factor D and luminous strength ratio S for satisfy condition A and condition B, can improve hangover amount and flicker amount simultaneously.Therefore, according to the device for video display of above-mentioned composition, can improve hangover amount and flicker amount simultaneously.

In the device for video display of above-mentioned composition, preferably has the video display unit of setting the transmissivity of pixel according to described vision signal; And the light source body of the described video display unit that throws light on, carry out the control of the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately by described light source body.

Best described light source body is a semiconductor light-emitting elements, for example light emitting diode.Also the light source body can be taken as the cold-cathode tube fluorescent light.

Perhaps, the device for video display of best above-mentioned composition has the video display unit of setting the brightness of pixel according to described vision signal, is carried out the control of the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately by described video display unit.

Described video display unit can be organic EL plate, also can be liquid crystal board.

Display board is the self-emission device of driven with active matrix.Organic EL for example.Each pixel has light-emitting component.Can have the capacitor to each pixel store image information, by repeatedly inserting this capacitor in the vertical cycle, making the luminous of pixel is the 1st luminous component and the 2nd luminous component.Perhaps can be by dividing capacitor, the light that pixel is sent out is the 1st luminous component and the 2nd luminous component.

Again, can supply with described video display unit in advance to the staggered video data of time shaft, and select 3 same pixels by the vertical cycle to described vision signal, making the luminous of pixel is the 1st luminous component and the 2nd luminous component.

The device for video display of above-mentioned composition can have the video display unit of setting the transmissivity of pixel according to described vision signal; And the light source body of the described video display unit that throws light on, has the illumination light intensity that is configured between described video display unit and the described light source body the described light source body of control, with the light control member of the control of carrying out the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately.

According to above-mentioned composition, the illumination light intensity by with light control member control light source body can carry out the brilliance control of the 1st luminous component and the 2nd luminous component easily.And, as long as make light source luminous, so can alleviate the burden that is added on the light source body with constant intensity.

Again, light control member can make the illumination light total transmissivity or the half transmitting of light source body, also can make its total transmissivity or blocking-up." make the light half transmitting ", its implication is: make light that the light source body sends with certain frequency transmission, but not 0% transmission." photoresistance is broken ", its implication is: transmissivity is 0%.

As the light source body, available semiconductor light-emitting elements.As the light source body, also available cold-cathode tube fluorescent light.

Device for video display of the present invention also can be formed in has the video display unit of setting the transmissivity of pixel according to described vision signal in the above-mentioned device for video display; And the light source body of the described video display unit that throws light on, the utilization of described light source body is to presenting and the illumination light that obtains after the intermittent light of the synchronous pulse type luminous intensity waveform of described vision signal and the lasting light that presents constant luminous intensity mix, the described video display unit that throws light on, described intermittent light and described lasting light bring the described the 1st luminous component and the described the 2nd luminous component pixel luminous intensity separately.

According to above-mentioned composition, utilize intermittent light and continuous light photopic vision as display unit.Utilize to mix the luminous energy that obtains behind this intermittent light and the lasting light obtain in fact with mix the 1st luminous component and the 2nd luminous component after the light that is equal to of the light that obtains.

Therefore, utilize the device for video display of above-mentioned composition also can obtain the effect of improving hangover amount and flicker amount simultaneously.

Preferably set the luminous intensity of described intermittent light and described lasting light for degree that human eye can be perceiveed.

According to above-mentioned composition, the degree (for example 90 nits) that becomes human eye to perceive the brightness settings of the pixel that shows in the described vertical cycle is so observer's eyes are seen device for video display objects displayed of the present invention easily clearly.Therefore, can improve the observability of device for video display objects displayed of the present invention.

Device for video display of the present invention preferably has according to described vision signal, detects the carry over detection part of the carry over amount of described video, according to described carry over amount, changes the value of described S and D.

According to above-mentioned composition, owing to change duty factor D and luminous strength ratio D according to the activity of the video that shows with the carry over scale, can be according to the activity adjustment hangover amount and the flicker amount of video.Therefore, the video of device for video display demonstration can basis be that rest image or live image improve embodiment and hangover amount.

Can change described S and D according to the average level of video.Its reason is that the embodiment of realization changes with the height of the average level of video.That is, embodiment has along with average level improves and the trend of increase.In the above-mentioned composition,, can select the value of best S and D, embodiment and hangover amount are improved simultaneously according to average level owing to change duty factor D or luminous strength ratio S according to average level.

Again, device for video display of the present invention is preferably in the video display unit that has in the above-mentioned device for video display according to the transmissivity of described vision signal setting pixel; And the light source body of the described video display unit that throws light on, described light source body is configured to leave described video display unit, mix in the space that the described the 1st luminous component and the described the 2nd luminous component are formed between described light source body and described video display unit.

That is, " type is penetrated at the end " back-lighting is set as light source at the back side as the liquid crystal board of video display unit as the non-light emitting-type LCD of an example of device for video display.Therefore, non-light emitting-type LCD forms the space between video display unit and light source body.

Mix the 1st luminous component and the 2nd luminous component in the space that above-mentioned composition utilization forms like this, thereby the type back-lighting is penetrated as also reducing live image hangover and flicker obstacle in the device for video display of light source in the end.

Again, device for video display of the present invention is preferably in the video display unit that has in the above-mentioned device for video display according to the transmissivity of described vision signal setting pixel; Send the described the 1st luminous component and the described the 2nd luminous component light source body with the described video display unit that throws light on; And the light mixing member that the described the 1st luminous component and the described the 2nd luminous component are mixed.

According to above-mentioned composition, device for video display of the present invention can mix the 1st luminous component and the 2nd luminous component reliably owing to have light mixing member.Therefore, the live image hangover that obtains by the 1st luminous component and the 2nd luminous component be can further obtain reliably and effect and the above-mentioned effect of improving improved.

In the device for video display of above-mentioned composition, best described light mixing member is a light guide plate, same end face along described light guide plate disposes described light source body, after described light guide plate will be mixed the light that obtains behind the described the 1st luminous component and the 2nd luminous component and is directed to end face with described video display unit opposite side from the end face that disposes described light source side, output to described video display unit.

That is, use " other according to the type " light source that has as the LCD of an example of device for video display is provided with light guide plate at the back side as the liquid crystal board of video display unit, by illumination light by this light-guide plate guides light source, and the illumination liquid crystal board.

Among the present invention, because after using the 1st luminous component that this light guide plate sends the light source body and the 2nd luminous component to mix, illumination video display unit can reduce live image hangover and flicker obstacle in using other device for video display according to the type light source.

Again, device for video display of the present invention is preferably in and also has the video display unit of setting the transmissivity of pixel according to described vision signal in the device for video display of above-mentioned composition; And the light source body of the described video display unit that throws light on, described light source body comprises the 1st light source body that sends described intermittent light and the 2nd light source body that sends described lasting light, and described device for video display has described the 1st light source body of control and lights the 1st light source body driver part that extinguishes; And control described the 2nd light source body and light the 2nd light source body driver part that extinguishes.

According to above-mentioned composition, send the 1st luminous component and the 2nd luminous component respectively by corresponding light source in the 1st light source body and the 2nd light source body.And these the 1st light source bodies and the 2nd light source body are independently controlled by the 1st light source body driver part and the 2nd light source body driver part respectively.

Therefore, can optimize the 1st light source body and the 1st light source body driver part, to optimize the luminance of the 1st luminous component; Can optimize the 2nd light source body and the 2nd light source body driver part, to optimize the luminance of the 2nd luminous component.Because independent optimization the 1st luminous component and the 2nd luminous component luminance are separately formed circuit and simplified like this, thereby realize easily reducing cost, or the reliability of circuit is improved.

Again, best described the 1st light source body driver part and described vision signal are synchronously switched at least one side in power, electric current and the voltage of supplying with described the 1st light source body.

That is, can utilize the luminous intensity waveform that presents with the synchronous rect.p. shape of vision signal to realize the 1st luminous component.Therefore, with vision signal synchronously break-make switch to supply with the power etc. of light source body, then can produce intermittent light easily.

Among the present invention,, can produce intermittent light easily because formation the 1st light source body driver part and vision signal are synchronously switched the power of supply the 1st light source body etc.Therefore, can obtain that live image hangover of the present invention improves effect and the flicker obstacle reduces effect with easy circuit composition.

Again, the best at least one side in power, electric current and the voltage described the 2nd light source body supplied with constant value of described the 2nd light source body driver part.

That is, can utilize the lasting light that always presents constant luminous intensity to realize the 2nd luminous component.Therefore, by the light source body is supplied with firm power etc., can produce lasting light easily.

In the above-mentioned composition, the 2nd light source body is supplied with constant power etc., can produce lasting light easily owing to constitute the 2nd light source body driver part.Therefore, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Again, preferably described the 2nd light source body driver part with described vision signal vertical frequency more than or equal to 3 times frequency (for example 150 hertz), at least one side in power, electric current and the voltage of described the 2nd light source body is supplied with in control.

That is, human eye is to repeating the light of light on and off with about 150 hertz frequency, and sensitivity is very low; To almost not reacting with the light that is higher than the frequency repetition light on and off about 300 hertz.Therefore, even if strict and light that the recandescence of overstating goes out, human eye is also regarded the 2nd luminous component sometimes as.

So, when the frequency setting of vision signal is 60 hertz, supply with the power of the 2nd light source body with the frequency control that is not less than 3 times 60 hertz, then can produce the substantial the 2nd luminous component by the 2nd light source body easily.Thereby, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, as described the 1st light source body and described the 2nd light source body, available semiconductor light-emitting elements, for example light emitting diode.

Again, preferably described the 2nd light source body utilization principle of luminosity different with described the 1st light source body sends the described the 2nd luminous component.

According to above-mentioned composition, because the light source that will the principle of luminosity different with the 1st luminophor sends lasting light is as the 2nd light source body, can be with the light-emitting component of suitable the 2nd luminous component, for example cold-cathode tube fluorescent light.Therefore, the long lifetime of the 2nd light source body can be realized, permanance can also be improved simultaneously.

Moreover device for video display of the present invention is preferably in to have in the above-mentioned device for video display and produces the intermittent light signal generator part that synchronously repeats the intermittent light signal of on off operating mode with vision signal; And always produce be the lasting light signal generator part of the lasting light of conducting state,, make the described the 1st luminous component and the described the 2nd luminous component luminous according to synthesizing the illumination light signal that obtains behind described intermittent light signal and the described lasting light signal.

According to above-mentioned composition, the light source physical efficiency is according to light signal generating the 1st luminous component at intermittence, and the light source body again can be according to lasting light signal generating the 2nd luminous component.Therefore, based on the illumination light signal that obtains behind synthetic intermittent light signal and the lasting light signal, then can obtain and mix the illumination light that forms behind the 1st luminous component and the 2nd luminous component from 1 light source body.So, can make the setting of optical system easy, the uneven luminance that can also reduce simultaneously to produce in the video display unit is with colored irregular.

Again, the frequency of described lasting light signal be described vision signal vertical frequency more than or equal to 3 times frequency (for example 150 hertz).

According to above-mentioned composition, with the frequency setting of vision signal for for example 60 hertz the time, the light source physical efficiency is sent the light that human eye is identified as the 2nd luminous component in fact easily.Thereby, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, utilize semiconductor light-emitting elements (for example light emitting diode) to send the described the 1st luminous component and the described the 2nd luminous component.

Can form the described the 2nd luminous component by the set of the pulse component of frequency with the vertical frequency that is higher than vision signal again.The frequency of best described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency, for example be not less than 150 hertz frequency.

In order to solve above-mentioned problem, device for video display of the present invention can constitute by the brightness demonstration video according to the vision signal modulated pixels, wherein has the video display unit of setting the transmissivity of pixel according to described vision signal; Send the 1st light source body that presents with the intermittent light of the synchronous pulse type luminous intensity waveform of described vision signal; And the 2nd luminophor that sends the lasting light that presents constant luminous intensity, utilizing and mix the illumination light that obtains behind described intermittent light and the described lasting light, described video display unit throws light on.

According to above-mentioned composition, will mix the light that obtains behind intermittent light and the lasting light as illumination light.Therefore, utilize the illumination light that light source body of the present invention obtains to keep constant luminous intensity by lasting light again, improve luminous intensity sending in the time of intermittent light again.

Thereby, when utilizing device for video display of the present invention to show mobile object, use the throw light on profile of this object of the luminous intensity corresponding with lasting light and these two kinds of luminous intensities of intermittent light.Like this, making profile utilized of mobile object comprise brightness only changes these 2 kinds of brightness of part of change the part of change and brightness and intermittent light and lasting light with lasting light and shows.

Its result, in the video of the profile of demonstration mobile object, the observer only can not discern contrast with lasting light to the part of change to brightness, only discerns brightness and intermittent light and the lasting light contrast to the part of change.Thereby, can improve the live image hangover that produces when showing mobile object.

Affirmations such as the inventor utilize in the stable illumination light of light source body of the present invention, adjust the duty factor of intermittent light, just can reduce the flicker amount.Confirm: for example the duty factor with intermittent light is set at 20%, will be 20% with respect to the lasting light brightness settings of illumination light brightness, and then making in the past, 90% flicker amount is reduced to 75%.

In sum, the light that device for video display of the present invention owing to will mix obtains behind intermittent light and the lasting light can improve the live image hangover and the obstacle that glimmers simultaneously as illumination light.

Specifically send intermittent light and lasting light respectively by corresponding light source in the 1st light source body and the 2nd light source body.

Therefore, can optimize the 1st light source body and the 1st light source body driver part, to optimize the luminance of the 1st luminous component; Can optimize the 2nd light source body and the 2nd light source body driver part, to optimize the luminance of the 2nd luminous component.Because independent optimization the 1st luminous component and the 2nd luminous component luminance are separately formed circuit and simplified like this, thereby realize easily reducing cost, or the reliability of circuit is improved.

Moreover the device for video display of above-mentioned composition preferably has described the 1st light source body of control and lights the 1st light source body driver part that extinguishes; And control described the 2nd light source body and light the 2nd light source body driver part that extinguishes.

According to above-mentioned composition, can optimize the 1st light source body and the 1st light source body driver part, to optimize the luminance of the 1st luminous component; Can optimize the 2nd light source body and the 2nd light source body driver part, to optimize the luminance of the 2nd luminous component.Because independent optimization the 1st luminous component and the 2nd luminous component luminance are separately formed circuit and simplified like this, thereby realize easily reducing cost, or the reliability of circuit is improved.

Moreover preferably described the 1st light source body driver part and described vision signal are synchronously switched at least one side in power, electric current and the voltage of supplying with described the 1st light source body.

That is, intermittent light is the waveform that presents with the synchronous pulse type luminous intensity of vision signal.Therefore, with vision signal synchronously break-make switch to supply with the power etc. of light source body, then can produce intermittent light easily.

Among the present invention,, can produce intermittent light easily because formation and vision signal are synchronously switched the power of supply the 1st light source drive part spare etc.Therefore, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover preferably described the 2nd light source body driver part is with at least one side of certain value in described the 2nd light source body supply power, electric current and voltage.

That is, lasting light is the light that presents constant luminous intensity.Therefore, by the light source body is supplied with constant power etc., can produce lasting light more conveniently.

In the above-mentioned composition, the 2nd light source body is supplied with constant power etc., can produce lasting light easily owing to constitute the 2nd light source body driver part.Therefore, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, can make described the 2nd light source body driver part supply with at least one side in power, electric current and the voltage of described the 2nd light source body more than or equal to the control of 3 times frequency (for example 150 hertz) with described vision signal vertical frequency.

That is, human eye is to repeating the light of light on and off with about 150 hertz frequency, and sensitivity is very low; To almost not reacting with the light that is higher than the frequency repetition light on and off about 300 hertz.Therefore, even if the light of strict abundant light on and off, human eye is also regarded lasting light sometimes as.

So, when the frequency setting of vision signal is 60 hertz, supply with the power of the 2nd light source body with the frequency control that is not less than 3 times 60 hertz, then can produce the substantial the 2nd luminous component by the 2nd light source body easily.Thereby, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, as described the 1st light source body and described the 2nd light source body, available semiconductor light-emitting elements, for example light emitting diode.

Again, preferably described the 2nd light source body utilization principle of luminosity different with described the 1st light source body sends the described the 2nd luminous component.

According to above-mentioned composition, because the light source that will the principle of luminosity different with the 1st luminophor sends lasting light is as the 2nd light source body, can be with the light-emitting component of suitable the 2nd luminous component, for example cold-cathode tube fluorescent light.Therefore, the long lifetime of the 2nd light source body can be realized, permanance can also be improved simultaneously.

In order to solve above-mentioned problem, device for video display of the present invention, comprise the video display unit that has a plurality of pixels and show video by the transmissivity of setting this pixel according to vision signal, the luminous light of described pixel comprises the 1st luminous component and the 2nd luminous component, also upgrade the luminous light of described pixel simultaneously by the timing of the vertical synchronizing signal of vision signal, if the timing that begins from described vertical cycle, extremely the time at the light emission period center of described the 1st luminous component is P% to the ratio of the vertical cycle of described vision signal, the fluorescent lifetime of described the 1st luminous component is D% to the ratio of described vertical cycle, then D/2≤P≤(100-D/2) and 0＜D＜100.

According to above-mentioned composition, can utilize the luminous light that comprises the 1st luminous component and the 2nd luminous component to suppress the hangover of mobiles again, the profile of clear display suppresses the flicker obstacle again simultaneously.

Device for video display of the present invention can be used for and will be used as the transmission-type or the reflection-type liquid-crystal display device of display element as the liquid crystal cell of non-light-emitting component, also can be used for using the display device of self light emitting display panel (organic EL plate etc.).

In the device for video display of best above-mentioned composition, the constant of establishing the responsive time constant decision of described video display unit is K, and then the pass of the optimum value PA of described time ratio is

PA=50+K, wherein 0≤K≤(50-D/2).

The responsive time constant of video display unit (for example liquid crystal board) is bigger, and when being 2 milliseconds to 5 milliseconds, the pass of the optimum value PA of P is PA=50+K, wherein 0≤K≤(50-D/2).K is determined by described responsive time constant, is certain constant.Obtaining the function that constant K uses from responsive time constant is not simple linear function, but has the trend that the big then K of responsive time constant increases.Therefore, according to the relational expression of above-mentioned PA and K, when responsive time constant is big, strengthen PA.That is, can optimize the hangover amount by making the luminous phase lag of the 1st luminous component.

Responsive time constant is 1 millisecond, and promptly fast under the situation, the value of P is about 50 the bests.Its reason is that during with hangover model representation hangover amount, during mainly the brightness that is produced by the 2nd luminous component changed, the mild oblique line of slope was obtained equilibrium before and after the 1st luminous component.

Moreover, preferably the described the 1st luminous component has the S% of the luminous intensity of the pixel that shows in the described vertical cycle, the described the 2nd luminous component occupies the (time of 100-D) % of described vertical cycle, simultaneously or have the pixel that shows in this vertical cycle luminous intensity (luminous intensity of 100-S) %, the value of described D and S satisfies following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23.

Researchs such as the inventor change duty factor D and luminous strength ratio S and the hangover amount and the flicker amount that obtain, and the experience that the result obtains is: by setting duty factor D and luminous strength ratio S for satisfy condition A and condition B, can improve hangover amount and flicker amount simultaneously.Therefore, according to the device for video display of above-mentioned composition, can improve hangover amount and flicker amount simultaneously.

Moreover, in the device for video display of above-mentioned composition, preferably have luminous component that sends the illumination light that comprises the described the 1st luminous component and described the 2nd luminous component and the modulating part of modulating described illumination light according to video signal.

Preferably each divides described display unit and the zone that forms makes the value difference of described P to described luminous component.

In the video display unit, according to the position of screen, the transmissivity of pixel is upgraded regularly different sometimes.Make the P value different by each zone like that mentioned above,, absorb this renewal phase differential regularly, thereby can obtain the optimal luminescent phase place promptly by making the luminous phase deviation of the 1st luminous component.

Moreover, the storer that best each pixel of described video display unit has the information that keeps vision signal, and the vertical cycle by each described vision signal is repeatedly with reference to described storer, described luminescent waveform become comprise the waveform of the described the 1st luminous component and described the 2nd luminous component.

According to above-mentioned composition, in the staggered information that keeps vision signal of storer, and repeatedly with reference to this storer, thereby form the waveform that comprises the 1st luminous component and the 2nd luminous component.Therefore, making the dot structure of video display unit not change each vertical synchronizing signal upgrades 1 time common composition and just can reduce hangover amount and flicker amount.

Above-mentioned composition is preferably used in the video display unit that each pixel has light-emitting component, for example is used for organic EL plate.The device for video display that uses organic EL plate is controlled the luminous quantity of described light-emitting component, thereby can be produced the 1st luminous component and the 2nd luminous component according to the information that above-mentioned storer keeps, and hangover amount and flicker amount are reduced.

Moreover, described video display unit can constitute to be supplied with in advance to the staggered video data of time shaft, and, make the luminescent waveform of described pixel become the waveform that comprises the described the 1st luminous component and described the 2nd luminous component by 3 same pixels of vertical cycle selection to described vision signal.Form according to this, also make the dot structure of video display unit not change each vertical synchronizing signal and upgrade 1 time common composition and just can reduce hangover amount and flicker amount.

(replenishing)

The invention is not restricted to the respective embodiments described above, can do various conversion in the scope shown in claims, the technological means that the different embodiments of appropriate combination disclose respectively and the embodiment obtained is also contained in the technology of the present invention scope, this does not need to illustrate.

Can make device for video display of the present invention, have according to the light source body of vision signal light the video display unit of modulating and the described video display unit that throws light on, the utilization of wherein said light source body is to presenting and the illumination light that obtains after the intermittent light of the luminous intensity waveform of the synchronous rect.p. shape of described vision signal and the lasting light that always presents constant luminous intensity mix, and described video display unit throws light on.

According to above-mentioned composition, will mix the light that obtains behind intermittent light and the lasting light as illumination light.Therefore, utilize the illumination light that light source body of the present invention obtains to keep constant luminous intensity by lasting light again, improve luminous intensity sending in the time of intermittent light again.

Thereby, when utilizing device for video display of the present invention to show mobile object, use the throw light on profile of this object of the luminous intensity corresponding with lasting light and these two kinds of luminous intensities of intermittent light.Like this, making profile utilized of mobile object comprise brightness only changes these 2 kinds of brightness of part of change the part of change and brightness and intermittent light and lasting light with lasting light and shows.

Its result, in the video of the profile of demonstration mobile object, the observer only can not discern contrast with lasting light to the part of change to brightness, only discerns brightness and intermittent light and the lasting light contrast to the part of change.Thereby, can improve the live image hangover that produces when showing mobile object.

Affirmations such as the inventor utilize in the stable illumination light of light source body of the present invention, adjust the duty factor of intermittent light, just can reduce the flicker amount.Confirm: for example the duty factor with intermittent light is set at 20%, will be 20% with respect to the lasting light brightness settings of illumination light brightness, and then making in the past, 90% flicker amount is reduced to 75%.

In sum, the light that device for video display of the present invention owing to will mix obtains behind intermittent light and the lasting light can improve the live image hangover and the obstacle that glimmers simultaneously as illumination light.

Moreover preferably the luminous intensity with described intermittent light and described lasting light is set at the degree that human eye can be perceiveed.

According to above-mentioned composition, owing to all set intermittent light and lasting light for degree (for example 90 nits) that human eye can be perceiveed, observer's eyes are seen clearly by these light easily in video display unit objects displayed.Therefore, can improve the observability of video display unit objects displayed.

Moreover, device for video display of the present invention preferably constitutes described light source body is configured to leave described video display unit, and mixes in the space that the described the 1st luminous component and the described the 2nd luminous component are formed between described light source body and described video display unit.

That is, " type is penetrated at the end " back-lighting is set as light source at the back side as the liquid crystal board of video display unit as the non-light emitting-type LCD of an example of device for video display.Therefore, non-light emitting-type LCD forms the space between video display unit and light source body.

Mix the 1st luminous component and the 2nd luminous component in the space that above-mentioned composition utilization forms like this, thereby the type back-lighting is penetrated as also reducing live image hangover and flicker obstacle in the device for video display of light source in the end.

Device for video display of the present invention also can constitute and has the light mixing member that described intermittent light and described lasting light are reduced to mix.

According to above-mentioned composition, device for video display of the present invention can mix intermittent light and lasting light reliably owing to have light mixing member.Therefore, can obtain more reliably that live image hangover that intermittent light and lasting light obtain improves effect and the flicker obstacle improves effect by mixing.

Moreover, the device for video display of above-mentioned composition, can constitute described light mixing member is light guide plate, same end face along described light guide plate disposes described light source body, and after described light guide plate will be mixed the light that obtains behind the described the 1st luminous component and the 2nd luminous component and is directed to end face with described video display unit opposite side from the end face that disposes described light source side, output to described video display unit.

That is, use " other according to the type " light source that has as the LCD of an example of device for video display is provided with light guide plate at the back side as the liquid crystal board of video display unit, by illumination light by this light-guide plate guides light source, and the illumination liquid crystal board.

Among the present invention, because after using the 1st luminous component that this light guide plate sends the light source body and the 2nd luminous component to mix, illumination video display unit is so can reduce live image hangover and flicker obstacle in using other device for video display according to the type light source.

Moreover, device for video display of the present invention, can constitute described light source body and comprise the 1st light source body that sends described intermittent light and the 2nd light source body that sends described lasting light, and have described the 1st light source body of control and light the 1st light source body driver part that extinguishes and control described the 2nd light source body and light the 2nd light source body driver part that extinguishes.

According to above-mentioned composition, send the 1st luminous component and the 2nd luminous component respectively by corresponding light source in the 1st light source body and the 2nd light source body.And these the 1st light source bodies and the 2nd light source body are independently controlled by the 1st light source body driver part and the 2nd light source body driver part respectively.

Therefore, can optimize the 1st light source body and the 1st light source body driver part, to optimize the luminance of the 1st luminous component; Can optimize the 2nd light source body and the 2nd light source body driver part, to optimize the luminance of the 2nd luminous component.Because independent optimization the 1st luminous component and the 2nd luminous component luminance are separately formed circuit and simplified like this, thereby realize easily reducing cost, or the reliability of circuit is improved.

Moreover preferably described the 1st light source body driver part and described vision signal are synchronously switched at least one side in power, electric current and the voltage of supplying with described the 1st light source body.

That is, intermittent light is the light that presents with the luminous intensity waveform of the synchronous rect.p. shape of vision signal.Therefore, with vision signal synchronously break-make switch to supply with the power etc. of light source body, then can produce intermittent light easily.

Among the present invention,, can produce intermittent light easily because formation the 1st light source body driver part and vision signal are synchronously switched the power of supply the 1st light source body etc.Therefore, can obtain that live image hangover of the present invention improves effect and the flicker obstacle reduces effect with easy circuit composition.

Moreover, the best at least one side in power, electric current and the voltage described the 2nd light source body supplied with constant value of described the 2nd light source body driver part.

That is, lasting light is the light that always presents constant luminous intensity.Therefore, by the light source body is supplied with firm power etc., can produce lasting light easily.

In the above-mentioned composition, the 2nd light source body is supplied with constant power etc., can produce lasting light easily owing to constitute the 2nd light source body driver part.Therefore, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Again, preferably described the 2nd light source body driver part is supplied with at least one side in power, electric current and the voltage of described the 2nd light source body with the frequency control more than or equal to 3 times of described vision signal vertical frequency.

That is, human eye is to repeating the light of light on and off with about 150 hertz frequency, and sensitivity is very low; To almost not reacting with the light that is higher than the frequency repetition light on and off about 300 hertz.Therefore, even if strict and light that the recandescence of overstating goes out, human eye is also regarded lasting light sometimes as.

So, when the frequency setting of vision signal is 60 hertz, supply with the power of the 2nd light source body with the frequency control that is not less than 3 times 60 hertz, then can produce substantial lasting light by the 2nd light source body easily.Thereby, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, as described the 1st light source body and described the 2nd light source body, available semiconductor light-emitting elements, for example light emitting diode.

Can make described the 2nd light source body utilization principle of luminosity different send lasting light with described the 1st light source body again.

According to above-mentioned composition, because the light source that will the principle of luminosity different with the 1st luminophor sends lasting light is as the 2nd light source body, can be with the light-emitting component of suitable the 2nd luminous component, for example cold-cathode tube fluorescent light.Therefore, the long lifetime of the 2nd light source body can be realized, permanance can also be improved simultaneously.

Moreover, can make device for video display of the present invention, have the intermittent light signal generator part that generation and vision signal synchronously repeat the intermittent light signal of on off operating mode; And always produce be the lasting light signal generator part of the lasting light of conducting state,, make described illumination light luminous according to synthesizing the illumination light signal that obtains behind described intermittent light signal and the described lasting light signal.

According to above-mentioned composition, the light source physical efficiency is according to light signal generating intermittent light at intermittence, and the light source body again can be according to lasting light signal generating lasting light.Therefore, based on the illumination light signal that obtains behind synthetic intermittent light signal and the lasting light signal, then can obtain and mix the illumination light that forms after intermittent light and the lasting light quantity from 1 light source body.So, can make the setting of optical system easy, the uneven luminance that can also reduce simultaneously to produce in the video display unit is with colored irregular.

Moreover, the frequency that can make described lasting light signal be described vision signal vertical frequency more than or equal to 3 times frequency.

According to above-mentioned composition, with the frequency setting of vision signal for for example 60 hertz the time, the light source physical efficiency is sent the light that human eye is identified as lasting light in fact easily.Thereby, can obtain that live image hangover of the present invention improves effect and flicker reduces effect with easy circuit composition.

Moreover, as described light source body, available semiconductor light-emitting elements, for example light emitting diode.

Again, device for video display of the present invention can constitute described light source body and have the 3rd luminous light source body of the constant intensity of feeling the pulse with three fingers simulataneously; And synchronously control the optical gate parts of the light intensity that the 3rd light source body sends with described vision signal.

That is, as indicated above, the luminous intensity of mixing the illumination light that obtains behind intermittent light and the lasting light is set for and utilized lasting light to keep constant luminous intensity, intermittently improve luminous intensity again.Therefore, utilize the optical gate parts to control, the light intensity that the 3rd light source body is sent keeps constant luminous intensity, and luminous intensity is improved off and on, then can obtain the identical illumination intensity of illumination light that obtains with mixing intermittent light and lasting light from the light that the 3rd light source body produces.

Owing to can be so only obtain and mix the illumination light that intermittent light and lasting light form, can improve described live image hangover and flicker obstacle simultaneously from the 3rd light source body.And the 3rd light source body needs only by constant intensity luminous, so can alleviate the burden that is added on the 3rd light source body.

Again, described optical gate parts can make light that described the 3rd light source body sends out and vision signal synchronously total transmissivity or half transmitting, light total transmissivity or blocking-up that described the 3rd light source body is sent out." make the light half transmitting ", its implication is: make light that the light source body sends with certain frequency transmission, but not 0% transmission." photoresistance is broken ", its implication is; Transmissivity is 0%.

As the 3rd light source body, available semiconductor light-emitting elements.As the also available cold-cathode tube fluorescent light of the 3rd light source body.

Moreover, when the video display unit is liquid crystal board, just device for video display of the present invention because during LCD, also can preferably obtain the effect of improving of live image hangover that device for video display of the present invention obtains and flicker obstacle.Therefore, carrying out in recent years among the LCD of device maximization, can effectively reduce live image hangover and flicker obstacle.

Device for video display of the present invention also can be used for the situation to the self-emission device of display board use driven with active matrix, for example available organic EL.Among organic EL, each pixel has light-emitting component, and each light-emitting component has the capacitor of store image information, repeatedly inserts this capacitor but improve in the vertical cycle, individual the 1st luminous component and the 2nd luminous component of comprising that pixel is sent out.Perhaps can be by dividing capacitor, the light that pixel is sent out comprises the 1st luminous component and the 2nd luminous component.

Again, supply with display board in advance, and select 3 same pixels, pixel is sent comprise the light of the 1st luminous component and the 2nd luminous component by vertical cycle to video to the staggered video data of time shaft.

Device for video display of the present invention owing to mix the illumination light illumination video display unit that lasting light and intermittent light obtain, can be taken into account and improve the live image hangover and reduce the obstacle that glimmers.Flicker not only makes the user feel bad, and causes notice and work efficiency to reduce, or to harmful effects such as health generation eye fatigue, but the present invention can prevent these harmful effects.And for improving the device for video display of high brightnessization and giant-screenization, it is indispensable reducing flicker.Like this, according to the present invention, can provide the best image quality to the user.

Moreover device for video display of the present invention can constitute and has the video display unit of light being modulated according to vision signal; And the light source body used of illumination video display unit, the utilization of described light source body comprise flicker free lasting light and with the illumination light of the synchronous intermittent light of vision signal, described video display unit throws light on.

In the invention of above-mentioned composition, also can constitute and have the 1st light source body driver part and the 2nd light source body driver part.The light source body is become with the 2nd light source group by the 1st light source group, controls the 1st light source group with the output intermittent light by the 1st light source body driver part, controls the 2nd light source group with the output lasting light by the 2nd light source body driver part.

Moreover, can constitute the 1st light source body driver part by with vision signal synchronously switched voltage or electric current, control the 1st light source group.The 2nd light source body driver part is by stably service voltage or electric current, perhaps by with vision signal non-synchronously changing voltage or electric current, control described the 2nd light source group.Can constitute again and make described light source body comprise the 1st different light source body of principle of luminosity and the 2nd light source body.

Device for video display of the present invention, can constitute to comprise and have the control signal production part that a plurality of generations make the electric signal that light source luminescent uses, and the electric signal as the output of a plurality of control signal production parts is synthesized the light source control section that light source is supplied with in the back.

In the above-mentioned composition, can make the generation and the synchronous break-make repeating signal of vision signal of a plurality of control signal production parts, to obtain intermittently luminous component.Also can make one of a plurality of control signal production parts to produce amplitude constant and the signal of normal conducting or the signal that non-synchronously changes with vision signal, continue luminous component to obtain.

Moreover device for video display of the present invention can constitute the optical gate parts that also have these illumination light of control.Optical gate parts and vision signal are synchronously controlled the light intensity from the illumination light of light source.

The optical gate parts can constitute whole or most of illumination light are worked.At this moment, the half transmitting control that can make the light intensity control of optical gate parts repeat to make the transmission control that light 100% passes through and light is passed through with non-0% requirement ratio.

The optical gate parts also can constitute partial illumination light is worked.At this moment, the light intensity of optical gate parts is controlled the transmission that repeats light 100% is passed through and is controlled and make the blocking-up control that light 100% is blocked.

Moreover device for video display of the present invention comprises the video display unit with a plurality of pixels; And the described video display unit that throws light on luminous component, by the described luminous component described video display unit that throws light on, by in described pixel according to the vision signal modulate illumination light, demonstration is based on the image of vision signal, wherein said luminous component utilization contains intermittently luminous component and the light that continues luminous component, and described video display unit throws light on.

In the above-mentioned composition, continue luminous component and intermittently different luminous of these characteristics of luminous component by mixing, the illumination display board can suppress the hangover of mobiles again, and the profile of clear display suppresses the obstacle that glimmers again simultaneously.

Device for video display of the present invention can be in above-mentioned device for video display, is updated to the luminous phase place that time resolution characteristics that the modulation rate of update time of different values and described pixel changes determine luminous component at described intermittence according to the modulation rate with described pixel.

In the above-mentioned composition, according to the Characteristics Control of the pixel phase place of luminous component intermittently.Thereby, can more effectively suppress the hangover of mobiles according to the characteristic of pixel and suppress the flicker obstacle.

Device for video display of the present invention can be in described device for video display the described a plurality of pixels of rectangular configuration, described video display unit has a plurality of column electrodes that dispose the shape of embarking on journey, described column electrode is applied the sweep signal of using toward the described video display unit of vertical scan direction, described pixel is updated to different values by the timing of described sweep signal with modulation rate, if the timing of described sweep signal to time at light emission period center of luminous component at described intermittence is Ta, be T0 the timing of described sweep signal to the cycle length of the timing of next sweep signal, when the constant of decision time response that changes according to the modulation rate of described pixel is K, satisfy the relation of following formula:

Ta=(1/2+K) * T0, wherein 0≤K≤0.5.

Utilize above-mentioned composition, can determine the intermittently luminous phase place of luminous component according to described update time and described time resolution characteristics.

Device for video display of the present invention can be divided into bulk with described luminous component in above-mentioned device for video display, and each illumination that is divided into the described luminous component of described bulk is in the pixel of the subregion of described video display unit.Also can make between each one that is divided into block described luminous component, described intermittence, the luminous phase place of luminous component was different mutually.

Position according to the screen of video display unit, sometimes the pixel transmission rate is upgraded under the regularly different situations, in the above-mentioned composition, and can be by making the intermittently luminous phase deviation of luminous component, absorb the influence of this renewal phase differential regularly, luminous phase adjusted is become more suitable state.

Device for video display of the present invention can be in being divided into luminous component block described device for video display, the described a plurality of pixels of rectangular configuration, described video display unit has a plurality of column electrodes that dispose the shape of embarking on journey, described column electrode is applied the sweep signal of using toward the described video display unit of vertical scan direction, described pixel is updated to different values by the timing of described sweep signal with modulation rate, and be divided in each one of described luminous component of described bulk, if the timing of described sweep signal to time at light emission period center of luminous component at described intermittence is Ta, be T0 the timing of described sweep signal to the cycle length of the timing of next sweep signal, when the constant of decision time response that changes according to the modulation rate of described pixel is K, satisfy the relation of following formula:

Ta=(1/2+K) * T0, wherein 0≤K≤0.5.

Utilize above-mentioned composition, can determine the intermittently luminous phase place of luminous component, luminous phase adjusted can also be become suitable state simultaneously according to described update time and described time resolution characteristics.

In the video display unit of the present invention, the 2nd light source that described luminous component can have the 1st light source that sends the light that forms luminous component at described intermittence and send the light that forms described lasting luminous component.At least one of described the 1st light source and the 2nd light source can be semiconductor light-emitting elements.Described semiconductor light-emitting elements can be light emitting diode.Described the 2nd light source can be the fluorescent light that utilizes discharge.Described video display unit can be the liquid crystal board that utilizes liquid crystal material.

Device for video display perhaps of the present invention has a plurality of pixels, by carrying out luminous display image in described each pixel based on vision signal, in order to solve above-mentioned problem, can constitute described each pixel utilization and have intermittently luminous component and the light display image that continues luminous component.

In the above-mentioned composition, continue luminous component and intermittently different luminous of these characteristics of luminous component by mixing, the illumination display board can suppress the hangover of mobiles again, shows the profile of curve, suppresses the obstacle that glimmers again simultaneously.

Device for video display of the present invention can be in above-mentioned device for video display, is updated to the luminous phase place that time resolution characteristics that the modulation rate of update time of different values and described pixel changes determine luminous component at described intermittence according to the modulation rate with described pixel.

In the above-mentioned composition, according to the Characteristics Control of the pixel phase place of luminous component intermittently.Thereby, can more effectively suppress the hangover of mobiles according to the characteristic of pixel and suppress the flicker obstacle.

Device for video display of the present invention can be in described device for video display the described a plurality of pixels of rectangular configuration, described video display unit has a plurality of column electrodes that dispose the shape of embarking on journey, described column electrode is applied the sweep signal of using toward the described video display unit of vertical scan direction, described pixel is updated to different values by the timing of described sweep signal with modulation rate, if the timing of described sweep signal to time at light emission period center of luminous component at described intermittence is Ta, be T0 the timing of described sweep signal to the cycle length of the timing of next sweep signal, when the constant of decision time response that changes according to the modulation rate of described pixel is K, satisfy the relation of following formula:

Ta=(1/2+K) * T0, wherein 0≤K≤0.5.

Utilize above-mentioned composition, can determine the intermittently luminous phase place of luminous component according to described update time and described time resolution characteristics.

Device for video display of the present invention can be divided into bulk with described luminous component in above-mentioned device for video display, and each illumination that is divided into the described luminous component of described bulk is in the pixel of the subregion of described video display unit.Also can make between each one that is divided into block described luminous component, described intermittence, the luminous phase place of luminous component was different mutually.

Position according to the screen of video display unit, sometimes the pixel transmission rate is upgraded under the regularly different situations, in the above-mentioned composition, and can be by making the intermittently luminous phase deviation of luminous component, absorb the influence of this renewal phase differential regularly, luminous phase adjusted is become more suitable state.

Device for video display of the present invention can be in being divided into luminous component block described device for video display, the described a plurality of pixels of rectangular configuration, described video display unit has a plurality of column electrodes that dispose the shape of embarking on journey, described column electrode is applied the sweep signal of using toward the described video display unit of vertical scan direction, described pixel is updated to different values by the timing of described sweep signal with modulation rate, and be divided in each one of described luminous component of described bulk, if the timing of described sweep signal to time at light emission period center of luminous component at described intermittence is Ta, be T0 the timing of described sweep signal to the cycle length of the timing of next sweep signal, when the constant of decision time response that changes according to the modulation rate of described pixel is K, satisfy the relation of following formula:

Ta=(1/2+K) * T0, wherein 0≤K≤0.5.

Utilize above-mentioned composition, can determine the intermittently luminous phase place of luminous component, luminous phase adjusted can also be become suitable state simultaneously according to described update time and described time resolution characteristics.

The embodiment of finishing in " embodiment (implementing the best mode that the present invention uses) " is illustrated technology contents of the present invention eventually, should not only limit to this instantiation narrow sense ground and explain, can be in spirit of the present invention and then do various conversion in the scope of claims of statement and put into practice.

Industrial practicality

According to the present invention, can improve simultaneously live image hangover and flicker. These effects are at device for video display The occasion of high brightness and maximization is especially remarkable. Therefore, the present invention especially is fit to LCD is maximized With high brightness.

Claims (95)

1, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

According to described vision signal, set the video display unit of the transmissivity of pixel; And

The throw light on light source body of described video display unit,

Carry out the control of the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately by described light source body.

2, the device for video display described in claim 1 is characterized in that,

Described light source body is a semiconductor light-emitting elements.

3, the device for video display described in claim 2 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

4, the device for video display described in claim 1 is characterized in that,

Described light source body is the cold-cathode tube fluorescent light.

5, device for video display as claimed in claim 1 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

6, device for video display as claimed in claim 1 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

7, the device for video display described in claim 1 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

8, the device for video display described in claim 7 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

9, the device for video display described in claim 7 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

10, device for video display as claimed in claim 1 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

11, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has the video display unit of setting the brightness of pixel according to described vision signal,

Carry out the control of the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately by described video display unit.

12, the device for video display described in claim 11 is characterized in that,

Described video display unit is organic EL plate.

13, the device for video display described in claim 11 is characterized in that,

Described video display unit is a liquid crystal board.

14, device for video display as claimed in claim 11 is characterized in that,

Described video display unit has the storer that each pixel is kept the information of vision signal,

Vertical cycle by each described vision signal is with reference to described storer repeatedly, makes the luminescent waveform of each pixel send the light that the described the 1st luminous component and the 2nd luminous component are formed.

15, the device for video display described in claim 14 is characterized in that,

Each pixel of described video display unit has light-emitting component.

16, device for video display as claimed in claim 11 is characterized in that,

Supply with described video display unit in advance to the staggered video data of time shaft,

Select 3 same pixels by vertical cycle, make the luminescent waveform of each pixel send the light of forming by the described the 1st luminous component and the described the 2nd luminous component described vision signal.

17, device for video display as claimed in claim 11 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

18, device for video display as claimed in claim 11 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

19, the device for video display described in claim 11 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

20, the device for video display described in claim 19 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

21, the device for video display described in claim 19 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

22, device for video display as claimed in claim 11 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

23, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal; And

The throw light on light source body of described video display unit,

Has the illumination light intensity that is configured between described video display unit and the described light source body the described light source body of control, with the light control member of the control of carrying out the described the 1st luminous component and the described the 2nd luminous component luminous intensity separately.

24, the device for video display described in claim 23 is characterized in that,

Described light control member is to make the illumination light total transmissivity of described light source body or the parts of half transmitting.

25, the device for video display described in claim 23 is characterized in that,

Described light control member is to make the illumination light total transmissivity of described light source body or the parts of blocking-up.

26, device for video display as claimed in claim 23 is characterized in that,

Described light source body is a semiconductor light-emitting elements.

27, the device for video display described in claim 26 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

28, device for video display as claimed in claim 23 is characterized in that,

Described light source body is the cold-cathode tube fluorescent light.

29, device for video display as claimed in claim 23 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

30, device for video display as claimed in claim 23 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

31, the device for video display described in claim 23 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

32, the device for video display described in claim 31 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

33, the device for video display described in claim 31 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

34, device for video display as claimed in claim 23 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

35, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal; And

The throw light on light source body of described video display unit,

The utilization of described light source body is to presenting and the illumination light that obtains after the intermittent light of the synchronous pulse type luminous intensity waveform of described vision signal and the lasting light that presents constant luminous intensity mix, the described video display unit that throws light on,

By described intermittent light and described lasting light, bring the described the 1st luminous component and the described the 2nd luminous component pixel luminous intensity separately.

36, the device for video display described in claim 35 is characterized in that,

With the luminous intensity of described intermittent light and described lasting light, set the degree that naked eyes can be perceiveed.

37, device for video display as claimed in claim 35 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

38, device for video display as claimed in claim 35 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

39, the device for video display described in claim 35 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

40, the device for video display described in claim 39 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

41, the device for video display described in claim 39 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

42, device for video display as claimed in claim 35 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

43, the device for video display described in claim 35 is characterized in that,

Described light source body comprises the 1st light source body that sends described intermittent light and the 2nd light source body that sends described lasting light,

Described device for video display also has:

Control described the 1st light source body and light the 1st light source body driver part that extinguishes; And

Control described the 2nd light source body and light the 2nd light source body driver part that extinguishes.

44, the device for video display described in claim 43 is characterized in that,

Described the 1st light source body driver part and described vision signal are synchronously switched at least one side in power, electric current and the voltage of supplying with described the 1st light source body.

45, the device for video display described in claim 43 is characterized in that,

Described the 2nd light source body driver part is with at least one side of certain value in described the 2nd light source body supply power, electric current and voltage.

46, device for video display as claimed in claim 43 is characterized in that,

Described the 2nd light source body driver part with described vision signal vertical frequency more than or equal to 3 times frequency, at least one side of control in described the 2nd light source body supply power, electric current and voltage.

47, device for video display as claimed in claim 43 is characterized in that,

Described the 2nd light source body driver part is with more than or equal to 150 hertz frequency, and at least one side in power, electric current and the voltage of described the 2nd light source body is supplied with in control.

48, device for video display as claimed in claim 43 is characterized in that,

Described the 1st light source body and described the 2nd light source body are semiconductor light-emitting elements.

49, the device for video display described in claim 48 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

50, device for video display as claimed in claim 43 is characterized in that,

Described the 2nd light source body utilizes and the different principle of luminosity of described the 1st light source body, sends the described the 2nd luminous component.

51, the device for video display described in claim 50 is characterized in that,

At least one side of described the 1st light source body and described the 2nd light source body is a semiconductor light-emitting elements.

52, the device for video display described in claim 51 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

53, the device for video display described in claim 50 is characterized in that,

Described the 2nd light source body is the cold-cathode tube fluorescent light.

54, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal; And

The throw light on light source body of described video display unit,

Described light source body is configured to leave described video display unit,

In the space that between described light source body and described video display unit, forms, mix the described the 1st luminous component and the described the 2nd luminous component.

55, device for video display as claimed in claim 54 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

56, device for video display as claimed in claim 54 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

57, the device for video display described in claim 54 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

58, the device for video display described in claim 57 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

59, the device for video display described in claim 57 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

60, device for video display as claimed in claim 54 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

61, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal;

Send the described the 1st luminous component and the described the 2nd luminous component, with the light source body of the described video display unit that throws light on; And

The light mixing member that the described the 1st luminous component and the described the 2nd luminous component are mixed.

62, the device for video display described in claim 61 is characterized in that,

Described light mixing member is a light guide plate,

Along the same end face of described light guide plate, dispose described light source body,

Described light guide plate will be mixed the light that obtains behind the described the 1st luminous component and the 2nd luminous component, be directed to end face with described video display unit opposite side from the end face that disposes described light source side after, output to described video display unit.

63, device for video display as claimed in claim 61 is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

64, device for video display as claimed in claim 61 is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

65, the device for video display described in claim 61 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

66, the device for video display described in claim 65 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

67, the device for video display described in claim 65 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

68, device for video display as claimed in claim 61 is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

69, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make the value of described D and S satisfy following condition:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23,

Described device for video display has:

Produce the intermittent light signal generator part that synchronously repeats the intermittent light signal of on off operating mode with vision signal;

Always producing is the lasting light signal generator part of the lasting light of conducting state; And

Illumination light signal according to obtaining behind synthetic described intermittent light signal and the described lasting light signal makes the described the 1st luminous component and the luminous adding circuit of the described the 2nd luminous component.

70, the device for video display described in claim 69 is characterized in that,

Described lasting light frequency be described vision signal vertical frequency more than or equal to 3 times frequency.

71, the device for video display described in claim 69 is characterized in that,

The frequency of described lasting light signal is more than or equal to 150 hertz.

72, as the described device for video display of claim 69, it is characterized in that,

Utilize semiconductor light-emitting elements to send the described the 1st luminous component and the described the 2nd luminous component.

73, the device for video display described in claim 72 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

74, as the described device for video display of claim 69, it is characterized in that,

Have according to described vision signal, detect the carry over detection part of the carry over amount of described video,

According to described carry over amount, change the value of described S or D.

75, as the described device for video display of claim 69, it is characterized in that,

Have according to described vision signal, detect the average level detection part of the average level of described video, and

Change the value of described S or D according to described average level.

76, the device for video display described in claim 69 is characterized in that,

Set by the pulse component of the frequency with the vertical frequency that is higher than vision signal forms the described the 2nd luminous component.

77, the device for video display described in claim 76 is characterized in that,

The frequency of described pulse component be described vision signal vertical frequency more than or equal to 3 times frequency.

78, the device for video display described in claim 76 is characterized in that,

The frequency of described pulse component is more than or equal to 150 hertz.

79, as the described device for video display of claim 69, it is characterized in that,

Have according to described vision signal, detect the histogrammic histogram detection part of described video,

According to described histogram, change the value of described S or D.

80, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make described D and S satisfy following condition A or condition B:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23, the ratio of the time of establishing the light emission period center from the timing that starts described vertical cycle to described the 1st luminous component to described vertical cycle is P%,

Make D/2≤P≤(100-D/2) and 0＜D＜100,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal; And

The throw light on light source body of described video display unit,

Carry out of the control of the time at light emission period center by described light source body to the ratio P of described vertical cycle from the timing that starts described vertical cycle to described the 1st luminous component.

81, the device for video display described in claim 80 is characterized in that,

If the constant by the decision of the responsive time constant of described video display unit is K, then the pass with the value of described P is

P=50+K, wherein 0≤K≤(50-D/2).

82, the device for video display described in claim 80 is characterized in that,

Described light source body is a semiconductor light-emitting elements.

83, the device for video display described in claim 82 is characterized in that,

Described semiconductor light-emitting elements is a light emitting diode.

84, the device for video display described in claim 80 is characterized in that,

Described light source body is the cold-cathode tube fluorescent light.

85, as the described device for video display of claim 80, it is characterized in that,

Described light source body makes the value of described P divide each district's difference that video display frame forms.

86, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make described D and S satisfy following condition A or condition B:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23, the ratio of the time of establishing the light emission period center from the timing that starts described vertical cycle to described the 1st luminous component to described vertical cycle is P%,

Make D/2≤P≤(100-D/2) and 0＜D＜100,

Described device for video display

Have the video display unit of setting the brightness of pixel according to described vision signal, and

Carry out of the control of the time at light emission period center by described video display unit to the ratio P of described vertical cycle from the timing that starts described vertical cycle to described the 1st luminous component.

87, the device for video display described in claim 86 is characterized in that,

If the constant by the decision of the responsive time constant of described video display unit is K, then the pass with the value of described P is

P=50+K, wherein 0≤K≤(50-D/2).

88, the device for video display described in claim 86 is characterized in that,

Described video display unit is organic EL plate.

89, the device for video display described in claim 86 is characterized in that,

Described video display unit is a liquid crystal board.

90, as the described device for video display of claim 86, it is characterized in that,

Described video display unit has the storer that each pixel keeps described vision signal,

Each vertical cycle by described vision signal is repeatedly with reference to described storer, makes the luminescent waveform of each pixel send the light that the described the 1st luminous component and the described the 2nd luminous component are formed.

91, the device for video display described in claim 90 is characterized in that,

Each pixel of described video display unit has light-emitting component,

Utilize the information that keeps in the described storer, control the luminous quantity of described light-emitting component.

92, as the described device for video display of claim 86, it is characterized in that,

Supply with described video display unit in advance to the staggered video data of time shaft,

Select 3 same pixels by vertical cycle, make the luminescent waveform of each pixel send the light of forming by described 1 luminous component and the described the 2nd luminous component described vision signal.

93, a kind of device for video display by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st luminous component and the described the 2nd luminous component, make described D and S satisfy following condition A or condition B:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23, the ratio of the time of establishing the light emission period center from the timing that starts described vertical cycle to described the 1st luminous component to described vertical cycle is P%,

Make D/2≤P≤(100-D/2) and 0＜D＜100,

Described device for video display has:

Set the video display unit of the transmissivity of pixel according to described vision signal; And

The throw light on light source body of described video display unit,

Has the illumination light intensity that is configured between described video display unit and the described light source body the described light source body of control, to carry out time to the light control member of the control of the ratio P of described vertical cycle from the timing that starts described vertical cycle to the light emission period center of described the 1st luminous component.

94, the device for video display described in claim 93 is characterized in that,

If the constant by the decision of the responsive time constant of described video display unit is K, then the pass with the value of described P is

P=50+K, wherein 0≤K≤(50-D/2).

95, a kind of video display packing by the brightness according to the vision signal modulated pixels, shows video, it is characterized in that, sends

Occupy time of D% of the vertical cycle of described vision signal, and have the 1st luminous component of luminous intensity of S% of the luminous intensity of the pixel that shows in this vertical cycle; And

Occupy described vision signal vertical cycle (time of 100-D) %, and have the pixel that shows in this vertical cycle luminous intensity (the 2nd luminous component of the luminous intensity of 100-S) %,

By controlling the described the 1st and the described the 2nd luminous component, make the value of described D and S satisfy following condition A or condition B:

Condition A:62≤S＜100 and 0＜D＜100 and D＜S, or

Condition B:48＜S＜62 and D≤(S-48)/0.23.

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