CN100472597C - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
- Publication number
- CN100472597C CN100472597C CNB2003801032194A CN200380103219A CN100472597C CN 100472597 C CN100472597 C CN 100472597C CN B2003801032194 A CNB2003801032194 A CN B2003801032194A CN 200380103219 A CN200380103219 A CN 200380103219A CN 100472597 C CN100472597 C CN 100472597C
- Authority
- CN
- China
- Prior art keywords
- image
- liquid crystal
- signal
- time
- lighting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
A liquid crystal display device in which a frame of the image signal to be displayed is written into a liquid crystal display panel (6) while a backlight (7) is activated intermittently within one frame period so as to prevent blur injury arising when displaying motion pictures includes: means (8) and (9) for variably controlling the illumination duration of the backlight (7) based on the detected type of the image content to be displayed. This configuration makes it possible to appropriately control the image quality degradation caused by blur injury, stroboscopic effect and flickering, hence realize total image quality improvement.
Description
Technical field
The present invention relates to utilize the back-lighting light source that LCD panel is thrown light on and the liquid crystal indicator of display image, relate in particular to by approaching impulse type and show the fuzzy liquid crystal indicator of activity that produces when preventing that live image from showing.
Background technology
In recent years, developing the planar display (FPD) that can realize high-resolution, low power consumption, space-efficient liquid crystal indicator (LCD) etc. energetically, wherein especially LCD is used for the universal and remarkable unusually of calculator display organization and televisor display device etc. always.Yet, with the cathode ray tube (CRT) contrast of mainly making this purposes, can point out the shortcoming of " movable fuzzy " among the LCD, promptly during the show events image, the beholder perceives the soft edge of movable part.
For example openly flat 9-No. 325715 communiques record of Jap.P. discloses, and the demonstration during live image shows is blured except that resulting from the optical response time delay of liquid crystal, also results from the display packing of LCD itself.Utilize electron beam scanning to make light-emitting phosphor with in the CRT display device that shows, though there are some residual light in fluorophor, the luminous of each pixel is the pulse display mode of roughly pulse type.
In contrast; in the LCD display device; for by liquid crystal is applied electric field, make the electric charge of storage before applying electric field next time, keep higher ratio (particularly, among the TFT type LCD always; at the every bit that constitutes pixel the TFT switch is set; and usually and each pixel is provided with auxiliary capacitor, thereby the hold facility of store charge is very high), its display mode is a maintenance; be liquid crystal pixel by apply rewrite based on the electric field of next frame Pixel Information before, continue luminous always.
In this maintenance display device, the impulse response of pixel display light has temporal width, thereby temporal frequency characteristic variation, and spatial frequency characteristic also reduces thereupon, and generation is watched image blurring.Therefore, in flat 9-No. 325715 communiques of above-mentioned patent disclosure, a kind of display device is proposed, by optical gate or the illuminator (back-lighting) that is located at display surface carried out break-make control, only the latter half in each field duration of display image illustrates display light to the beholder, the time width of restriction pulse display light is watched the fuzzy of image thereby improve.
This point of explanation sees figures.1.and.2.Among Fig. 1, the 111st, the illuminator that flashlamp etc. can flicker at a high speed, the 112nd, to the power supply of illuminator 111 power supplies, the 113rd, electrical picture signal is transformed into the transmission-type display elements such as TFT type liquid crystal of image display light, the 116th, utilize picture signal and synchronizing signal produce to drive the driving circuit of the drive signal of display element 113 usefulness, the 117th, produce the pulse generating circuit of using with control power supply 112 break-makes with the gating pulse of the synchronizing signal vertical synchronization of input.
That is, utilize the fluorescent lifetime of pulse generating circuit 117 and power supply 112 control illuminators 111.Therefore, the overall response of the image display light that shows as image is 50% o'clock in the rate of for example lighting, and only forms t2 constantly to pulse conducting waveform in the time of t3 constantly, the pulse conducting waveform of t4 to the time of t5 constantly constantly.Therefore, show that the overall response time width reduces, its time frequency characteristic is also improved the characteristic that becomes more smooth, thereby the deterioration in image quality of live image when showing also improves.
Like this, the picture signal by the 1 frame share that should show writes LCD panel, and through after the stipulated time, makes whole back-lighting light source igniting, improves the fuzzy quality deterioration that waits of the activity that produces when live image shows.This mode is called full frame flash type, except that flat 9-No. 325715 communiques of above-mentioned patent disclosure, is for example also disclosing this mode in 2001-No. 201763 communiques of patent disclosure, 2002-No. 55657 communiques of patent disclosure etc.
To above-mentioned full frame flash type back-lighting lighting mode, for example in flat 11-No. 202286 communiques of patent disclosure, 2000-No. 321551 communiques of patent disclosure, 2001-No. 296838 communiques of patent disclosure, propose " sweep type back-lighting mode ", wherein pairing each the luminous dividing regions in a plurality of divisions viewing area of LCD panel scans the back-lighting light source successively, it is lighted, thereby improve the fuzzy quality deterioration that waits of the activity that produces when live image shows.
By back-lighting is flickered at a high speed successively, the show state that drives from maintenance approaches the demonstration that the such impulse type of CRT drives like this in explanation in Fig. 3 to Fig. 5.Among Fig. 3, under the direction configuration many (being 4 here) that is parallel to sweep trace, penetrate type fluorescent light (CCFT) 203～206 at the back side of LCD panel 202, and synchronously light each lamp 203～206 successively along direction from top to bottom with the sweep signal of LCD panel 202.Each lamp 203～206 is corresponding to each viewing area that on the horizontal direction LCD panel 202 is divided into 4.
Fig. 4 is the figure regularly that lights that the lamp corresponding with Fig. 3 is shown.Among Fig. 4, the illuminating state of high level (High) state representation lamp.For example,, write vision signal in the timing of (1) in 1 frame period, and the liquid crystal response that postpones (2), (3) regularly lights fluorescent light 203 on (4) after the time to 1/4 dividing regions of upside in the LCD panel 202.Like this, each is divided the running that 1 lamp is only lighted in viewing area after in 1 frame period, repeating to write vision signal.
Thus, can drive the impulse type that show state approach CRT from the maintenance of liquid crystal and drive show state, thereby carry out live image vision signal before nonrecognition 1 frame when showing, can prevent that the live image display quality that edge fog causes from reducing.Again, as shown in Figure 5, make lamp be 1 group and light simultaneously, not only also can obtain same effect with 2, and the lighting the time of the back-lighting that can extend, can suppress back-lighting brightness and reduce.
In this sweep type back-lighting lighting mode, each of a plurality of divisions of LCD panel viewing area, with the liquid crystal fully timing of response optically, light the luminous zone of corresponding back-lighting light source, thereby can make from liquid crystal being write image even to the time of lighting the back-lighting light source, irrelevant with display screen position (upper-lower position).Therefore, have can with the display screen location independent substantially improve the movable fuzzy advantage of live image.
Also to intermittently type of drive proposition of above-mentioned back-lighting " black once-type " liquid crystal indicator, this device does not intermittently drive the back-lighting light source in 1 frame period, and in 1 frame period, picture signal and black signal are repeated to write LCD panel, thereby scan behind certain video signal frame to scanning next frame, pixel fluorescent lifetime (image shows the time) is shortened, realize that the analog pulse type shows.
As this black display type liquid crystal indicator, (flat 9-No. 127917 communiques of patent disclosure, flat 11-No. 109921 communiques of patent disclosure) of having known for example have: shown in Fig. 6 (a), after LCD panel write 1 frame input image data successively, full screen is write black video data simultaneously, thereby make full screen deceive demonstration at the appointed time; Shown in Fig. 6 (b), write black video data successively by each sweep trace, make the part screen deceive demonstration at the appointed time, thereby compare with existing maintenance demonstration, the image demonstration time in 1 frame period shortens.
Above-mentioned prior art is in order to improve the fuzzy deterioration in image quality that is caused of activity that produces when live image shows in the maintenance display device, carrying out back-lighting in 1 frame period when lining by line scan of 60Hz (for example be 16.7msec) intermittently drives, or by deceiving shows signal is follow-up to write LCD panel in image display signal, shorten the image demonstration time, simulation ground approaches the such impulse type of CRT from maintenance driving show state and drives demonstration.
Here,, preferably reduce pulsation rate (image in 1 frame period shows the ratio of time), but when reducing pulsation rate, may cause the problem of following (1)～(3) in order to improve the movable fuzzy deterioration in image quality that causes.
(1) the big or small degree of movable fuzzy (Motion Blur) is different because of image, for example under situations such as CG (computer graphical), animation, game image, shown in Fig. 7 (a), what scan in the continuous time that is connected originally is the image of discrete (being certain moment of each frame) only, does not often add the activity of the effect of the interlude that forms interpolation interframe and blurs.
When use applies movable bluring by Flame Image Process, can see movable smooth and easy, but when showing the fuzzy image (being the content images that original activity has some setbacks) of no activity in the mode that reduces pulsation rate, produce to see the sparse stroboscopic of live image (Stroboscopic) defective scatteredly, and then cause deterioration in image quality.
The image that the common storage-type video camera that is used as television camera is taken is because the time continuous integration of shutter opening, movable fuzzy amount is different because of shutter speed, for example film and photographic studio etc. have the image (for example relay of indoor contest such as news program, swimming) of the indoor shot of strong illumination because shutter speed height (the time weak point that shutter is opened), shown in Fig. 7 (b), the activity that is added on mobile's image during shooting is fuzzy little, when showing that in the mode that reduces pulsation rate little image is blured in this activity, produce the possibility height of above-mentioned stroboscopic defective.
Otherwise, the image of taking in field that baseball, rugby night game relay etc. does not work is because shutter speed low (shutter open time long) sometimes, shown in Fig. 7 (c), it is fuzzy to add many activities during shooting on mobile's image, even thereby show the fuzzy many images of this activity in the mode that reduces pulsation rate, also can the performance activity fuzzy smooth and easy activity that brings, so do not produce the stroboscopic defective, preferably preferential show events is fuzzy to be reduced and the live image of clear-cut.
(2) it is non-linear to think that the visual characteristic when watching live image has an eye response of the time integral effect of eye movement and vision, photic stimuli intensity, but it is different because of moving speed of mobile's image etc. in the eye movement in the characteristic that perceives most important pursuit movement (left and right sides eyes are followed the tracks of mobiles) aspect the live image roughly the samely, when some picture material shows in the mode that reduces pulsation rate, might produce above-mentioned stroboscopic defective.
For example, the relay of motion such as rugby, vollyball is such, on the horizontal direction similarly under the situation of the image of movable on the full screen (complete moving), because the movable fuzzy deterioration in image quality that causes is remarkable, preferably reduce pulsation rate as far as possible, show, pay close attention to that the personage fixes and under the situation of the image of background activity but make thereby realize reducing movable live image fuzzy and clear-cut, reduce pulsation rate, then cause the possibility height of the image deterioration that above-mentioned generation stroboscopic defective caused.
(3) and, when reducing pulsation rate,, strengthen the black demonstration time (the non-demonstration time of image) in 1 frame period at the reverse side of the fuzzy defective of the activity that can reduce live image, thereby especially in white image displaying part, glimmer significantly the deterioration in image quality that causes this flicker to cause.
In sum, when some picture material classification reduces pulsation rate, produce defectives such as stroboscopic, flicker, might cause deterioration in image quality, be difficult to realize the raising of synthetic image quality.Existing problems.
The optimum pulse rate is different because of picture material, picture material etc., and because the difference of individual subscriber, degree of being quick of perception (dynamic visual acuity) deviation of, stroboscopic fuzzy to activity, flicker is big, thereby exists and be difficult to each user is realized the problem that the synthetic image quality improves.
The present invention finishes in view of above-mentioned problem, a kind of liquid crystal indicator is provided, the controlled ratio of making the image demonstration time in 1 frame period that changes with the picture material classification that should show, thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause realizes the improvement of synthetic image quality.
Again, the present invention finishes in view of above-mentioned problem, a kind of liquid crystal indicator is provided, the controlled ratio of making the image demonstration time in 1 frame period that changes according to user's indication input, thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause realizes the improvement of synthetic image quality.
Summary of the invention
The 1st invention is a kind of liquid crystal indicator, the picture signal that should show writes LCD panel, also in 1 frame period, intermittently light the back-lighting light source simultaneously, it is characterized by: comprise the unit that detects the classification of answering display image content and be controlled to described variable unit of back-lighting light source igniting time according to described detected picture material classification.
The 2nd invention is in described the 1st invention, it is characterized by: described back-lighting light source is in each cycle and the synchronously full screen flash of light of the vertical synchronizing signal of supplying with described LCD panel.
The 3rd invention is in described the 1st invention, and it is characterized by: described back-lighting light source synchronously scans and light a plurality of luminous zones successively with vertical synchronizing signal and the horizontal-drive signal of supplying with LCD panel.
The 4th invention is in described the 1st to the 3rd invention, it is characterized by: the luminous intensity of this back-lighting light source can be changed with the time of lighting of described back-lighting light source.
The 5th invention is in described the 1st to the 3rd invention, it is characterized by: the gray level of received image signal can be changed with the time of lighting of described back-lighting light source.
The 6th invention is in described the 1st to the 3rd invention, it is characterized by: the grayscale voltage that is applied to described LCD panel accordingly with received image signal can be changed with time of lighting of described back-lighting light source.
The 7th invention is in described the 1st to the 3rd invention, it is characterized by: the frame rate that can change received image signal according to described picture material classification.
The 8th invention is in described the 1st to the 3rd invention, it is characterized by: according to the content information that broadcast data comprises, detect the classification of answering display image content.
The 9th invention is that it is characterized by: the content information according to obtaining from foreign medium detects the classification of answering display image content in described the 1st to the 3rd invention.
The 10th invention is in described the 1st to the 3rd invention, and it is characterized by: the video source according to user's input is selected indication information, detects the classification of answering display image content.
The 11st invention is a kind of liquid crystal indicator, picture signal that should show in 1 frame period and black shows signal write LCD panel, it is characterized by, have the unit that detects the classification of answering display image content and be controlled to the variable unit of time of described LCD panel being supplied with described black shows signal according to described detected picture material classification.
The 12nd invention is in described the 11st invention, it is characterized by: the luminous intensity of shining the back-lighting light source of described LCD panel can change with the service time of described black signal.
The 13rd invention is in described the 11st invention, it is characterized by: the gray level of received image signal can be changed with the service time of described black shows signal.
The 14th invention is in described the 11st invention, it is characterized by: the grayscale voltage that is applied to described LCD panel accordingly with received image signal can be changed with the service time of described black shows signal.
The 15th invention is in described the 11st to the 14th invention, it is characterized by: according to the content information that comprises in the broadcast data, detect the classification of answering display image content.
The 16th invention is that it is characterized by: the content information according to obtaining from the outside detects the classification of answering display image content in described the 11st to the 14th invention.
The 17th invention is in described the 11st to the 14th invention, and it is characterized by: the video source according to user's input is selected indication information, detects the classification of answering display image content.
The 18th invention is a kind of liquid crystal indicator, in 1 frame period, be provided with and answer demonstration time and the non-demonstration time of display image signals, it is characterized by: have unit that detects the classification of answering display image content and the variable unit of ratio that is controlled to the picture signal demonstration time in described 1 frame period according to described detected picture material liquid crystal board.
The 19th invention is in described the 18th invention, it is characterized by: the gray level of received image signal can be changed with the time of lighting of described back-lighting light source.
The 20th invention is in described the 18th invention, it is characterized by: the grayscale voltage that is applied to described liquid crystal board accordingly with received image signal can be changed with time of lighting of described back-lighting light source.
The 21st invention is in described the 18th to the 21st invention, it is characterized by: according to the content information that comprises in the broadcast data, detect the classification of answering display image content.
The 22nd invention is in described the 18th to the 21st invention, it is characterized by: detect the classification of answering display image content according to the content information that obtains from the outside.
The 23rd invention is in described the 18th to the 21st invention, and it is characterized by: the video source according to user's input is selected indication information, detects the classification of answering display image content.
The 24th invention is a kind of liquid crystal indicator, the picture signal that should show writes LCD panel, also in 1 frame period, intermittently light the back-lighting light source simultaneously, it is characterized by: have the unit of the indication input that detects the user and indicate input to be controlled to described variable unit of back-lighting light source igniting time according to described detected user.
The 25th invention is in described the 24th invention, it is characterized by: described back-lighting light source is in each cycle and the synchronously full screen flash of light of the vertical synchronizing signal of supplying with described LCD panel.
The 26th invention is in described the 24th invention, and it is characterized by: described back-lighting light source synchronously scans and light a plurality of luminous zones successively with vertical synchronizing signal and the horizontal-drive signal of supplying with LCD panel.
The 27th invention is in described the 24th to the 26th invention, it is characterized by: the luminous intensity of this back-lighting light source can be changed with the time of lighting of described back-lighting light source.
The 28th invention is in described the 24th to the 26th invention, it is characterized by: the gray level of received image signal can be changed with the time of lighting of described back-lighting light source.
The 29th invention is in described the 24th to the 26th invention, it is characterized by: the grayscale voltage that is applied to described LCD panel accordingly with received image signal can be changed with time of lighting of described back-lighting light source.
The 30th invention is in described the 24th to the 26th invention, it is characterized by: can indicate according to the user, change the frame rate of received image signal.
The 31st invention is in described the 24th to the 26th invention, it is characterized by: can select indication information according to the video source of user's input, change lighting the time of described back-lighting light source.
The 32nd invention is in described the 24th to the 26th invention, it is characterized by: can change lighting the time of described back-lighting light source according to the video adjustment indication of user's input.
The 33rd invention is a kind of liquid crystal indicator, picture signal that should show in 1 frame period and black shows signal write LCD panel, it is characterized by: have the unit of the indication input that detects the user and be controlled to the variable unit of time of LCD panel being supplied with described black shows signal according to described detected user's indication.
The 34th invention is in described the 33rd invention, it is characterized by: the luminous intensity of the back-lighting light source of the described LCD panel of irradiation can be changed with the service time of described black signal.
The 35th invention is in described the 33rd invention, it is characterized by: the gray level of received image signal can be changed with the service time of described black shows signal.
The 36th invention is in described the 33rd invention, it is characterized by: the grayscale voltage that is applied to described LCD panel accordingly with received image signal can be changed with the service time of described black shows signal.
The 37th invention is in described the 33rd to the 36th invention, it is characterized by: can select indication information according to the video source of user's input, change the service time of described black shows signal.
The 38th invention is in described the 33rd to the 36th invention, it is characterized by: can adjust indication information according to the video of user's input, change the service time of described black shows signal.
The 39th invention is a kind of liquid crystal indicator, the picture signal that setting should show in 1 frame period is characterized by the demonstration time and the non-demonstration time of liquid crystal board: have the unit of the indication input that detects the user and the variable unit of ratio that is controlled to the picture signal demonstration time in described 1 frame period according to described detected user's indication.
The 40th invention is in described the 39th invention, it is characterized by: make the gray level of received image signal can show the rate of change of time with the picture signal in described 1 frame period.
The 41st invention is in described the 39th invention, it is characterized by: make the grayscale voltage that is applied to described liquid crystal board accordingly with received image signal can show the rate of change of time with the picture signal in described 1 frame period.
The 42nd invention is in described the 39th to the 41st invention, it is characterized by: can select indication information according to the video source of user's input, change the ratio that interior image display signal of described 1 frame period shows the time.
The 43rd invention is in described the 39th to the 41st invention, it is characterized by: can adjust indication information according to the video of user's input, change the ratio that interior picture signal of described 1 frame period shows the time.
According to liquid crystal indicator of the present invention, when intermittently driving the back-lighting light source for preventing that activity is fuzzy, according to the classification of answering display image content, or according to user's indication, suitably switch lighting the time of back-lighting, promptly switch the ratio (pulsation rate) of the image demonstration time in 1 frame period, thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause can realize the improvement of synthetic image quality.
Equally, by LCD panel being write black shows signal when preventing that movable mold from sticking with paste, also according to the classification of answering display image content, or according to user's indication, suitably switch the black demonstration time, promptly switch the ratio (pulsation rate) of image demonstration time in 1 frame period, thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause can realize the improvement of synthetic image quality.
Description of drawings
Fig. 1 illustrates the functional block diagram that existing liquid crystal indicator (full screen flash type) key component summary is formed.
Fig. 2 is the key diagram that the demonstration response of existing liquid crystal indicator (full screen flash type) is shown.
Fig. 3 is the key diagram that illustrates in the existing liquid crystal indicator (sweep type) the back-lighting light source profile instance of LCD panel.
Fig. 4 is the key diagram that the timing that each lamp is lighted/extinguished in the existing liquid crystal indicator (sweep type) of an example is shown.
Fig. 5 is the key diagram that the timing that each lamp is lighted/extinguished in the existing liquid crystal indicator (sweep type) of another example is shown.
Fig. 6 illustrates the diagrammatic illustration figure that shows principle of work, and wherein (a) and (b) are the impulse type demonstration based on black once-type, is that maintenance shows (c).
Fig. 7 is the diagrammatic illustration figure that is used for the different picture material classification of the fuzzy addition of explanation activity.
Fig. 8 is the functional block diagram that the key component summary composition of liquid crystal indicator embodiment 1 of the present invention is shown.
Fig. 9 is the key diagram that is used to illustrate the basic functional principle of a routine liquid crystal indicator embodiment 1 of the present invention.
Figure 10 is the key diagram that is used to illustrate the basic functional principle of another routine liquid crystal indicator embodiment 1 of the present invention.
Figure 11 is the key diagram that is used to illustrate the basic functional principle of a routine liquid crystal indicator embodiment 2 of the present invention.
Figure 12 is the key diagram that is used to illustrate the basic functional principle of another routine liquid crystal indicator embodiment 2 of the present invention.
Figure 13 is the functional block diagram that the key component summary composition of liquid crystal indicator embodiment 3 of the present invention is shown.
Figure 14 is the sequential chart that is used to illustrate the electrode drive running of liquid crystal indicator embodiment 3 of the present invention.
Figure 15 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 3 of the present invention.
Figure 16 is the functional block diagram that the liquid crystal indicator key component summary composition of embodiment of the present invention 4 is shown.
Figure 17 is the functional block diagram that the electrode drive portion of embodiment 4 is shown.
Figure 18 is the diagrammatic illustration figure that the content instance of benchmark grayscale voltage deposit data portion in the liquid crystal indicator of the present invention is shown.
Figure 19 is a transmissivity that a routine liquid crystal is shown to the key diagram of the relation that applies voltage.
Figure 20 is the diagrammatic illustration figure that the liquid crystal response characteristic of liquid crystal indicator of the present invention is shown.
Figure 21 is the block diagram that the summary composition of benchmark grayscale voltage generating unit in the liquid crystal indicator of the present invention is shown.
Figure 22 is the circuit diagram that the key component summary composition of signal-line driving circuit in the liquid crystal indicator of the present invention is shown.
Figure 23 illustrates liquid crystal indicator of the present invention when maintenance shows and the diagrammatic illustration figure of gamma (γ) characteristic of impulse type when showing.
Figure 24 is the functional block diagram that the key component summary composition of liquid crystal indicator embodiment 5 of the present invention is shown.
Figure 25 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 5 of the present invention.
Figure 26 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 5 of the present invention.
Figure 27 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 5 of the present invention.
Figure 28 is that the pulsation rate that liquid crystal indicator embodiment 5 of the present invention is shown is switched the routine key diagram of running.
Figure 29 is the key diagram that the pulsation rate setting picture example of liquid crystal indicator embodiment 5 of the present invention is shown.
Figure 30 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 6 of the present invention.
Figure 31 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 6 of the present invention.
Figure 32 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 6 of the present invention.
Figure 33 is the functional block diagram that the key component summary composition of liquid crystal indicator embodiment 7 of the present invention is shown.
Figure 34 is the sequential chart that is used to illustrate the electrode drive running of liquid crystal indicator embodiment 7 of the present invention.
Figure 35 is the key diagram that is used to illustrate the basic functional principle of liquid crystal indicator embodiment 7 of the present invention.
Figure 36 is the functional block diagram that the key component summary composition of liquid crystal pixel device embodiments 8 of the present invention is shown.
Figure 37 is the functional block diagram that the electrode drive portion of embodiment 8 is shown.
Figure 38 is the performance plot that the relation of outer illuminance in the environment for use of liquid crystal indicator of the present invention and display brightness is shown.
Figure 39 is the performance plot that the relation of response time of liquid crystal indicator of the present invention and temperature is shown.
The best mode that carries out an invention
Below, embodiments of the present invention are described.
At first, embodiment 1～4 is described, promptly according to the liquid crystal indicator of answering the testing result automatic switchover pulsation rate of displaying contents classification.
Below, together with Fig. 8 to Figure 10, describe embodiments of the present invention 1 in detail.Here, Fig. 8 is the functional block diagram that the key component summary composition of liquid crystal indicator embodiment 1 of the present invention is shown.Fig. 9 is the key diagram that is used to illustrate the basic functional principle of a routine liquid crystal indicator embodiment 1 of the present invention.Figure 10 is the key diagram that is used to illustrate the basic functional principle of another routine liquid crystal indicator embodiment 1 of the present invention.
As shown in Figure 8, the liquid crystal indicator of present embodiment has separated part 1 and image decoding portion 2, the former isolates each data from the input multiple connection data (transport stream) of contract with MPEG (Motion Picture Experts Group) standard equipressure image encoded, voice data and control data (content information etc.), and the latter carries out MPEG decoding to the view data of described separation.
Also have with the frame rate of the received image signal of described decoding be transformed into high frequency frame rate transformation component 3, conversion received image signal gray level greyscale transformation portion 4, be used for driving the data electrode of LCD panel 6 and the electrode drive portion 5 and the active array type LCD panel 6 of scan electrode according to received image signal.
The following type back-lighting light source 7 of penetrating that has the back side that is configured in described LCD panel 6 again, the light source drive part 8 that drive the intermittence that this back-lighting light source 7 was lighted/extinguished in 1 vertical demonstration time (1 frame period), received image signal after 2 decodings of described image decoding portion extracts the synchronizing signal extraction unit 9 of synchronizing signal, the control data that separates from described separated part 1 obtains and analyzes the synchronizing signal of extracting according to described synchronizing signal extraction unit 9 behind the content information and control lighted/extinguish the control CPU10 that the control signal of the timing of light source 7 behind outputs to light source drive part 8.
Telstar), BS (Broadcasting Satellite: programme information that comprises in the broadcast data that broadcasting satellite) sends (type information etc.) and the content information of reading from DVD disk media such as (digital multi-purpose CDs) here, the content-data available broadcast platform that comprises of control data utilizes CS (CommunicationSatellite:.Control CPU10 is by after analyzing the picture material classification that these information detect and differentiation should show, with reference to the ROM that deposits the pulsation rate information of each picture material classification in advance, produce the control signal that changes back-lighting ignition period (image shows the time) usefulness by for example.
Here, the implication of content type is classification such as motion, drama, news, animation, contest.The content information that comprises as above-mentioned broadcast data, if except that EPG (electronic program guides) information with program type, record classification etc., also have the photographing information of recording and narrating shooting conditions such as shutter speed, movable fuzzy additional information etc., control CPU10 can detect the content type of answering display image according to this information.Except that above-mentioned broadcast data comprises the content information, also can select indication information from the input video source (video configuration) that menu is set picture according to the user, EPG (electronic program guides) information that obtains from foreign medium, the shooting condition information that the user takes, adds view data when writing down etc., distinguish the content type (hereinafter describing in detail) of answering display image.
Above-mentioned control CPU10 is variable together with being controlled to the lighting the time of back-lighting light source 7 (image shows the time), also control light source drive part 8, make the luminosity of back-lighting light source 7 variable, perhaps control greyscale transformation portion 4, make the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 7, also in greyscale transformation portion 4 conversion received image signal gray levels, even so that shorten light the time (the lighting rate) of back-lighting light source 7, the relation of received image signal and display brightness is also fixing simultaneously.
Do not change the luminosity of back-lighting light source 7 and reduce pulsation rate, the low pixel damage of brightness then, thereby conversion received image signal gray level, strengthen display brightness, improve the contrast of dark gray, perhaps strengthen pulsation rate, the high pixel damage of brightness then, thereby conversion received image signal gray level, reduce display brightness, improve the contrast of bright gray scale.Thus, can realize that distinct image shows.
Above-mentioned control CPU10 is control frame frequency conversion part 3 as required also, makes the frame rate of the picture signal of supplying with LCD panel 6 variable.Frame rate transformation component 3 for example has frame memory, after storing the image of 1 frame share of received image signal into frame memory, according to the control signal from control CPU10, output transform becomes the picture signal of regulation frame rate, thereby received image signal is carried out the time shaft compression.
As above-mentioned back-lighting light source 7, except that under penetrate the type fluorescent light, penetrate type or other under also available according to type led light source, EL light source etc.Especially LED (light emitting diode), its response speed is tens ns～hundreds of ns, compares with the ms level response speed of fluorescent light, response is good, thus can realize being more suitable for switching light/extinguish state.
The liquid crystal indicator of present embodiment utilizes full screen flash type back-lighting lighting method to prevent that the activity that produces when live image shows is fuzzy.Promptly, from finishing whole scannings (image writes) of display frame, after postponing the predetermined stipulated time, back-lighting light source 7 is applied drive waveforms, thereby light in the time at the back-lighting shown in Fig. 9 bend part, make 7 pairs of entire display screen curtains of back-lighting light source illuminate (flash of light) simultaneously.
Here, can change the back-lighting shown in Fig. 9 bend part according to the classification of answering display image content and light the time, the image that promptly changes in 1 frame period shows the time (pulsation rate), thereby suitably suppress the deterioration in image quality that factors such as the generation activity is fuzzy, stroboscopic, flicker cause, realize the improvement of synthetic image quality.
For example, among Fig. 9 (a)～(c), the running example of following situation is shown: establish and utilize frame rate transformation component 3 that picture signal frame rate (60Hz) always is transformed into its 240Hz of 4 times, back-lighting is lighted timing controlled become variable, thereby pulsation rate switched to 30%, 40%, 50% 3 grades respectively.
Promptly, Input Image Content for example is when the content (with reference to figure 7 (c)) that the field that baseball, rugby night game relay etc. does not work is taken, the possibility of taking with low no-delay gate is big, thereby the activity fuzzy quantity is many, even reduce pulsation rate, the possibility that produces picture quality defectives such as stroboscopic, flicker is little.
Therefore, shown in Fig. 9 (a), write scanning from finishing image, after fully being longer than at interval the time (be 1 frame period 45%) of preset liquid crystal response time here, back-lighting light source 7 is lighted, and the image scanning that remains to next frame begins, and promptly keeps one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 30%, can realize that the live image that prevents fuzzy infringement of generation activity and clear-cut shows, simultaneously also can the fuzzy smooth and easy activity of mobile's image that brings of performance activity.
When Input Image Content for example has the content (for example the relay of indoor contest such as news program, swimming etc.) (with reference to figure 7 (b)) of the indoor shot of strong illumination for film with in the photographic studio etc., the possibility of taking with high-speed shutter is big, thereby the activity fuzzy quantity is few, reduce pulsation rate, then may produce picture quality defectives such as stroboscopic, flicker.
Therefore, shown in Fig. 9 (b), write scanning from finishing image, fully be longer than at interval the time (be 1 frame period 35%) of preset liquid crystal response time here after, back-lighting light source 7 is lighted, the lengthening back-lighting is lighted the time (image shows the time).Thus, making pulsation rate is 40%, can prevent the fuzzy infringement of generation activity, also can suppress to produce picture quality defectives such as stroboscopic, flicker simultaneously, the smooth and easy activity of performance mobile image.
When Input Image Content does not for example have movable fuzzy content (with reference to figure 7 (a)) for CG (computer graphical), animation, recreation etc., reduce pulsation rate, the possibility that then produces picture quality defectives such as stroboscopic, flicker is big.
Therefore, shown in Fig. 9 (c), write scanning from finishing image, only postpone the predetermined liquid crystal response time after (be 1 frame period 25%) here, back-lighting light source 7 is lighted, and the image scanning that remains to next frame begins, and promptly keeps one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 50%, can suppress the fuzzy infringement of generation activity, also can prevent to produce picture quality defectives such as stroboscopic, flicker simultaneously, and the smooth and easy activity of performance mobile image.
In sum, according to the picture material that should show, make back-lighting light constant time lag, or back-lighting is extinguished timing do sth. in advance, it is variable to make back-lighting light the time (image show time), thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause can realize the improvement of synthetic image quality.
In the example shown in Figure 9, make the frame rate of display image signals be fixed as 240Hz, but also can be as shown in figure 10, for example by control CPU10 control frame frequency conversion part 3, make the frame rate of display image variable, it is variable also to make back-lighting light the time simultaneously, thereby can the switch pulse rate.
For example, Input Image Content for example is when the content (with reference to figure 7 (c)) that the field that baseball, rugby night game relay etc. does not work is taken, the possibility of taking with low no-delay gate is big, thereby the activity fuzzy quantity is many, even reduce pulsation rate, the possibility that produces picture quality defectives such as stroboscopic, flicker is little.
Therefore, shown in Figure 10 (a), the frame rate of received image signal is transformed into its 240Hz of 4 times, making image write sweep time is 25% of 1 frame period, and write scanning from finishing image, after the at interval predetermined liquid crystal response time (be 1 frame period 25%), back-lighting light source 7 is lighted here, and the image scanning that remains to next frame begins, and promptly keeps one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 50%, can realize that the live image that prevents fuzzy infringement of generation activity and clear-cut shows, simultaneously also can the fuzzy smooth and easy activity of mobile's image that brings of performance activity.
When Input Image Content for example has the content (for example the relay of indoor contest such as news program, swimming etc.) (with reference to figure 7 (b)) of the indoor shot of strong illumination for film with in the photographic studio etc., the possibility of taking with high-speed shutter is big, thereby the activity fuzzy quantity is few, reduce pulsation rate, then may produce picture quality defectives such as stroboscopic, flicker.
Therefore, shown in Figure 10 (b), be transformed into its 480Hz of 8 times by frame rate with received image signal, image is write shorten to 12.5% of 1 frame period sweep time, and write scanning from finishing image, after the at interval predetermined liquid crystal response time (be 1 frame period 25%), back-lighting light source 7 is lighted here, the lengthening back-lighting is lighted the time (image shows the time).Thus, making pulsation rate is 62.5%, can suppress the fuzzy infringement of generation activity, also can reduce picture quality defectives such as producing stroboscopic, flicker simultaneously, the smooth and easy activity of performance mobile image.
When Input Image Content does not for example have movable fuzzy content (with reference to figure 7 (a)) for CG (computer graphical), animation, recreation etc., reduce pulsation rate, the possibility that then produces picture quality defectives such as stroboscopic, flicker is big.
Therefore, shown in Figure 10 (c), be controlled to the frame rate conversion of not carrying out received image signal, ignore the liquid crystal response time, always make back-lighting light source 7 full screens light (lighting continuously), pulsation rate is switched to 100%, thereby can show the smooth and easy activity (live image is fuzzy, then reduces picture quality defectives such as stroboscopic, flicker) of mobile's image.
In sum, can change with the picture material that should show by making the back-lighting time of lighting in 1 frame period, suitably the deterioration in image quality that causes of factor such as fuzzy, the stroboscopic flicker of inhibition activity can realize the improvement of synthetic image quality.Can also with example shown in Figure 9 combination, but the variable freedom of the pulsation rate of the scale that adapts to LCD panel 6 and response characteristic is further improved.
In the above-mentioned present embodiment, can switch 3 grades of back-lightings according to the classification of picture material and light the time, promptly the image in 1 frame period shows the time (pulsation rate), show (pulsation rate is 100%) comprising full maintenance, but the invention is not restricted to this, as long as can switch the predetermined pulsation rate more than 2 kinds according to the picture material classification.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
As content information, use from the broadcast station broadcast signal and/or EPG (electronic program guides) information that can obtain from foreign medium.Perhaps, in the time of can obtaining shooting condition information such as fuzzy additional information of the activity of relevant Input Image Content and shutter speed, available this information is differentiated the classification of answering display image content.
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also available this user's input video source selects indication information to distinguish the classification of answering display image content, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.Like this, also can constitute with user's indication information of relevant video adjustment project and distinguish the classification of answering display image content, pulsation rate is controlled to variable.
In sum, the liquid crystal indicator of present embodiment is in the device that approaches impulse type driving show state with full screen flash type lighting mode, suitably switch lighting the time of back-lighting according to the picture material classification, promptly the image in 1 frame period shows the ratio (pulsation rate) of time, thereby can suitably suppress the deterioration in image quality that factors such as stroboscopic, flicker cause, can realize the improvement of synthetic image quality.
The luminosity (back-lighting brightness) of back-lighting light source 7 can be changed with light the time (pulsation rate) of the back-lighting light source 7 in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 4 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Also can constitute and not be that above-mentioned embodiment makes the 7 full screens flashes of light of change back-lighting light source own light (intermittently lighting) like that, but the lightproof unit of the LCD etc. of the transmittance time in 1 frame period of restriction is set between the back-lighting light source of Chang Liang (lighting continuously) and LCD panel, with the modulation image display light.
Then, together with Figure 11 and Figure 12 embodiment of the present invention 2 is described; The part mark identical symbol identical with above-mentioned embodiment 1 omits its explanation.Here, Figure 11 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of a routine present embodiment, and Figure 12 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of another routine present embodiment.
The liquid crystal indicator of present embodiment utilizes sweep type back-lighting lighting mode to prevent that the activity that produces when live image shows is fuzzy, and its basic functional block diagram is with above this block diagram together with the embodiment 1 of Fig. 1 elaboration is identical.Difference is: will by with many of sweep trace configured in parallel under penetrate regulation radical (number) in type or the other back-lighting light source 7 that constitutes according to type led light source, EL light source etc. as 1 luminous zone, and in 1 frame period successively scanning light them.The content information that comprises in vertical/horizontal synchronizing signal (sweep signal) that control CPU10 extracts according to synchronizing signal extraction unit 9 and the control data that separated part 1 is separated is controlled the timing that scans each luminous zone of lighting the back-lighting light source successively.
Promptly, as shown in figure 11, in the present embodiment, from finishing (image writes) of certain horizontal line group (demonstration dividing regions), after considering the delay share of liquid crystal response, the luminous zone (certain fluorescent light group or LED group) of the pairing back-lighting light source 7 of this horizontal line group is lighted.Repeat this operation one by one in vertical direction.Thus, shown in the part of the oblique line among Figure 11, can make the back-lighting time of lighting write the scanning position corresponding to picture signal, be unit with the luminous zone, along with the time experience, shifts successively.
Here, the back-lighting that changes each luminous zone shown in Figure 11 bend part according to the classification of answering display image content is lighted the time, the image that promptly changes in 1 frame period shows the time (pulsation rate), thereby the deterioration in image quality that factors such as the activity that suitably suppresses to produce with picture material is blured, stroboscopic, flicker cause realizes the improvement of synthetic image quality.
In the present embodiment, control CPU10 is variable together with being controlled to the lighting the time of back-lighting light source 7 (image shows the time), also controls light source drive part 8, makes the luminosity of back-lighting light source 7 variable, perhaps control greyscale transformation portion 4, make the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 7, also in greyscale transformation portion 4 conversion received image signal gray levels, even so that shorten light the time (the lighting rate) of back-lighting light source 7, the relation of received image signal and display brightness is also fixing simultaneously.
Above-mentioned control CPU10 is control frame frequency conversion part 3 as required also, makes the frame rate of the picture signal of supplying with LCD panel 6 variable.Frame rate transformation component 3 for example has frame memory, after storing the image of 1 frame share of received image signal into frame memory, according to the control signal from control CPU10, output transform becomes the picture signal of regulation frame rate, thereby received image signal is carried out the time shaft compression.
For example, among Figure 11 (a)～(c), the running example of following situation is shown: picture signal frame rate (60Hz) is not applied conversion, and being lighted timing controlled, back-lighting becomes variable, thereby the image demonstration time in 1 frame period is carried out 3 grades of switchings, promptly be respectively 3/8 frame period, 1/2 frame period, 5/8 frame period.
Promptly, Input Image Content for example is when the content (with reference to figure 7 (c)) that the field that baseball, rugby night game relay etc. does not work is taken, the possibility of taking with low no-delay gate is big, thereby the activity fuzzy quantity is many, even reduce pulsation rate, the possibility that produces picture quality defectives such as stroboscopic, flicker is little.
Therefore, shown in Figure 11 (a), from certain horizontal line group, finish image and write the scanning beginning, after fully being longer than the time (being 1/2 frame period) of preset liquid crystal response time here at interval, the luminous zone of the pairing back-lighting light source 7 of this horizontal line group is lighted, and the image that remains to next frame writes scanning beginning, promptly keeps one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 37.5%, can realize that the live image that prevents fuzzy infringement of generation activity and clear-cut shows, simultaneously also can the fuzzy smooth and easy activity of mobile's image that brings of performance activity.
When Input Image Content for example has the content (for example the relay of indoor contest such as news program, swimming etc.) (with reference to figure 7 (b)) of the indoor shot of strong illumination for film with in the photographic studio etc., the possibility of taking with high-speed shutter is big, thereby the activity fuzzy quantity is few, reduce pulsation rate, then may produce picture quality defectives such as stroboscopic, flicker.
Therefore, shown in Figure 11 (b), from certain horizontal line group, finish image and write the scanning beginning, after fully being longer than the time (being 3/8 frame period) of preset liquid crystal response time here at interval, the luminous zone of the pairing back-lighting light 7 of this horizontal line group is lighted, and the lengthening back-lighting is lighted the time (image shows the time).Thus, making pulsation rate is 50%, can prevent the fuzzy infringement of generation activity, also can suppress to produce picture quality defectives such as stroboscopic, flicker simultaneously, the smooth and easy activity of performance mobile image.
When Input Image Content does not for example have movable fuzzy content (with reference to figure 7 (a)) for CG (computer graphical), animation, recreation etc., reduce pulsation rate, the possibility that then produces picture quality defectives such as stroboscopic, flicker is big.
Therefore, shown in Figure 11 (c), from certain horizontal line group, finish image and write the scanning beginning, after only postponing the predetermined liquid crystal response time (being 1/4 frame period) here, back-lighting light source 7 is lighted, and the image scanning that remains to next frame begins, and promptly keeps one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 62.5%, can suppress the fuzzy infringement of generation activity, also can prevent to produce picture quality defectives such as stroboscopic, flicker simultaneously, and the smooth and easy activity of performance mobile image.
In sum, according to the picture material that should show, make back-lighting light constant time lag, or back-lighting is extinguished timing do sth. in advance, it is variable to make back-lighting light the time (image show time), thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause can realize the improvement of synthetic image quality.
In the example shown in Figure 11, make the frame rate of display image signals be fixed as 60Hz, but also can be as shown in figure 12, for example by control CPU10 control frame frequency conversion part 3, make the frame rate of display image variable, it is variable also to make back-lighting light the time simultaneously, thereby can the switch pulse rate.
For example, Input Image Content for example is when the content (with reference to figure 7 (c)) that the field that baseball, rugby night game relay etc. does not work is taken, the possibility of taking with low no-delay gate is big, thereby the activity fuzzy quantity is many, even reduce pulsation rate, the possibility that produces picture quality defectives such as stroboscopic, flicker is little.
Therefore, shown in Figure 12 (a), do not carry out the frame rate conversion of received image signal, and from certain horizontal line group, finish image and write the scanning beginning, after only postponing the predetermined liquid crystal response time (being 1/4 frame period) here, the luminous zone of back-lighting light source 7 is lighted, and the image scanning that remains to next frame begins, promptly keep one section back-lighting to light the time (image shows the time).Thus, making pulsation rate is 62.5%, can realize that the live image that prevents fuzzy infringement of generation activity and clear-cut shows, simultaneously also can the fuzzy smooth and easy activity of mobile's image that brings of performance activity.
When Input Image Content for example has the content (for example the relay of indoor contest such as news program, swimming etc.) (with reference to figure 7 (b)) of the indoor shot of strong illumination for film with in the photographic studio etc., the possibility of taking with high-speed shutter is big, thereby the activity fuzzy quantity is few, reduce pulsation rate, then may produce picture quality defectives such as stroboscopic, flicker.
Therefore, shown in Figure 12 (b), be transformed into its 240Hz of 4 times by frame rate with received image signal, image is write shorten to 1/4 of 1 frame period sweep time, and finish image from certain horizontal line group and write scanning, after only postponing the predetermined liquid crystal response time (being 1/4 frame period) here, the luminous zone of back-lighting light source 7 is lighted, the lengthening back-lighting is lighted the time (image shows the time).Thus, making pulsation rate is 72%, can suppress the fuzzy infringement of generation activity, also can reduce picture quality defectives such as producing stroboscopic, flicker simultaneously, the smooth and easy activity of performance mobile image.
When Input Image Content does not for example have movable fuzzy content (with reference to figure 7 (a)) for CG (computer graphical), animation, recreation etc., reduce pulsation rate, the possibility that then produces picture quality defectives such as stroboscopic, flicker is big.
Therefore, shown in Figure 12 (c), be controlled to the frame rate conversion of not carrying out received image signal, ignore the liquid crystal response time, always make back-lighting light source 7 full screens light (lighting continuously), pulsation rate is switched to 100%, thereby can show the smooth and easy activity (live image is fuzzy, then reduces picture quality defectives such as stroboscopic, flicker) of mobile's image.
In sum, can change with the picture material that should show by making the back-lighting time of lighting in 1 frame period, suitably the deterioration in image quality that causes of factor such as fuzzy, the stroboscopic flicker of inhibition activity can realize the improvement of synthetic image quality.Can also with example shown in Figure 11 combination, but the variable freedom of the pulsation rate of the scale that adapts to LCD panel 6 and response characteristic is further improved.
In the above-mentioned present embodiment, can switch 3 grade of 1 image in the frame period according to the classification of picture material and show the time (image shows the time), it is pulsation rate, show (pulsation rate is 100%) comprising full maintenance, but the invention is not restricted to this, as long as can switch the predetermined pulsation rate more than 2 kinds according to the picture material classification.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
As content information, use from the broadcast station broadcast signal and/or EPG (electronic program guides) information that can obtain from foreign medium.Perhaps, in the time of can obtaining shooting condition information such as fuzzy additional information of the activity of relevant Input Image Content and shutter speed, available this information is differentiated the classification of answering display image content.
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also available this user's input video source selects indication information to distinguish the classification of answering display image content, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.Like this, also can constitute with user's indication information of relevant video adjustment project and distinguish the classification of answering display image content, pulsation rate is controlled to variable.
Again, in the above-mentioned embodiment, back-lighting light source 7 is divided into 8 luminous zones (horizontal line group) scans successively and light, but obvious luminous dividing regions number is to get final product more than 2, and each luminous zone is not limited to the zone that horizontal direction (with the sweep trace parallel direction) is divided back-lighting light source 7.On this aspect, in the time of will penetrating the type planar LED as behind light source 7 down, can make the setting degree of freedom height of luminous dividing regions.
In sum, the liquid crystal indicator of present embodiment is in the device that approaches impulse type driving show state with the sweep type lighting mode, suitably switch lighting the time of back-lighting according to the picture material classification, promptly the image in 1 frame period shows the ratio (pulsation rate) of time, thereby can suitably suppress the deterioration in image quality that factors such as stroboscopic, flicker cause, can realize the improvement of synthetic image quality.
The luminosity (back-lighting brightness) of back-lighting light source 7 can be changed with light the time (pulsation rate) of the back-lighting light source 7 in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 4 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Also can constitute be not above-mentioned embodiment make like that become back-lighting light source 7 itself be divided into a plurality of luminous zones and successively scanning light (intermittently lighting), but between the back-lighting light source of Chang Liang (lighting continuously) and LCD panel, be provided with each is divided the lightproof unit that the LCD etc. of the transmittance time in 1 frame period is limited in the viewing area, with the modulation image display light.
Then, together with Figure 13 to Figure 15 embodiment of the present invention 3 is described; The part mark identical symbol identical with above-mentioned embodiment 2 omits its explanation.Here, Figure 13 is the functional block diagram that the liquid crystal indicator key component summary composition of present embodiment is shown, Figure 14 is the sequential chart of electrode drive running that is used to illustrate the liquid crystal indicator of present embodiment, and Figure 15 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of a routine present embodiment.
As shown in figure 14, the liquid crystal indicator of present embodiment makes back-lighting light source 7 always be illuminating state (lighting continuously), and then deceive the black once-type that shows signal writes scanning (restoring scanning) after utilizing interior image display signal of 1 frame period to write scanning to LCD panel 16, the activity that produces when preventing movable the demonstration is fuzzy, it is characterized by: control CPU10 writes regularly variable according to the black shows signal that the classification of picture material is controlled to electrode drive portion 5.
That is, electrode drive portion 5 carries out sequence of operations in 1 frame period: except that selecting each sweep trace to be used for the image demonstration, also select sweep trace to be used for black the demonstration once more, select data line supply received image signal and black shows signal according to this again simultaneously.Like this, make the time (black demonstration time) that produces the demonstration black signal between certain two field picture demonstration and the demonstration of next frame image.Here, the black shows signal Displaying timer (time delay) that picture signal is write regularly can be changed with the picture material classification that control CPU10 differentiates.
Again, control CPU10 is variable together with being controlled to the black demonstration time, also controls light source drive part 8, makes the luminosity of back-lighting light source 7 variable, perhaps controls greyscale transformation portion 4, makes the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 7, also in greyscale transformation portion 4 conversion received image signal gray levels, even so that shorten lighting the time of back-lighting light source 7, the relation of received image signal and display brightness is also fixing simultaneously.
Figure 14 is the sequential chart of the sweep trace (grid line) of relevant LCD panel 6.In 1 frame period, staggering a little periodically starts grid line Y1～Y480 successively, so that by signal wire (data line) picture signal is write pixel cell.Start whole 48 grid lines, picture signal is write pixel cell, thereby finished for 1 frame period.
At this moment,, after the time that only postpones to determine, start grid line Y1 ~ Y480 once more, show black current potential each pixel cell is supplied with by data line X according to the picture material classification from being used for the startup that picture signal writes.Thus, each pixel cell becomes black show state.That is, each grid line Y becomes high level 2 times with different timings in 1 frame period.Make the pixel data of pixel cell demonstration certain hour by the 1st time selection after, then make pixel cell forcibly deceive demonstration with the 2nd selection.
For example, among Figure 15 (a)～(c), the running example of following situation is shown: picture signal frame rate (60Hz) is not applied conversion, and being lighted timing controlled, back-lighting becomes variable, thereby the demonstration time of the image in 1 frame period is switched to 3 grades respectively, i.e. 1/4 frame period, 1/2 frame period, 1 frame period.
Promptly, Input Image Content for example is when the content (with reference to figure 7 (c)) that the field that baseball, rugby night game relay etc. does not work is taken, the possibility of taking with low no-delay gate is big, thereby the activity fuzzy quantity is many, even reduce pulsation rate, the possibility that produces picture quality defectives such as stroboscopic, flicker is little.
Therefore, shown in Figure 15 (a), write from certain pixel is finished image, only postponed for 1/4 frame period after, start writing of black shows signal, and will deceive the image that the demonstration time (3/4 frame) remains to next frame and write the scanning beginning.Thus, making pulsation rate is 25%, can realize that the live image that prevents fuzzy infringement of generation activity and clear-cut shows, simultaneously also can the fuzzy smooth and easy activity of mobile's image that brings of performance activity.
When Input Image Content for example has the content (for example the relay of indoor contest such as news program, swimming etc.) (with reference to figure 7 (b)) of the indoor shot of strong illumination for film with in the photographic studio etc., the possibility of taking with high-speed shutter is big, thereby the activity fuzzy quantity is few, reduce pulsation rate, then may produce picture quality defectives such as stroboscopic, flicker.
Therefore, shown in Figure 15 (b), write from certain pixel is finished image, only postponed for 1/2 frame period after, start writing of black shows signal, and keep the black demonstration time (1/2 frame period), write the scanning beginning up to the next frame image.Thus, the lengthening image shows the time, and making pulsation rate is 50%, can suppress the fuzzy infringement of generation activity, also can reduce picture quality defectives such as producing stroboscopic, flicker simultaneously, the smooth and easy activity of performance mobile image.
When Input Image Content does not for example have movable fuzzy content (with reference to figure 7 (a)) for CG (computer graphical), animation, recreation etc., reduce pulsation rate, the possibility that then produces picture quality defectives such as stroboscopic, flicker is big.
Therefore, shown in Figure 15 (c), be controlled to the scanning that writes of not carrying out black shows signal, the black demonstration time (making the image demonstration time keep for 1 frame period) of cancellation, thereby pulsation rate was switched to for 100% (full maintenance shows), can show the smooth and easy activity (live image is fuzzy, and then picture quality such as stroboscopic, flicker defective reduces) of mobile's image.
In sum, according to the picture material that should show, make black signal service time (the non-demonstration time of picture signal) variable, promptly image shows that the time is variable, thereby the deterioration in image quality that factors such as suitably the inhibition activity is fuzzy, stroboscopic, flicker cause can realize the improvement of synthetic image quality.
In the above-mentioned present embodiment, can switch 3 grade of 1 image in the frame period according to the classification of picture material and show the time (image shows the time), it is pulsation rate, show (pulsation rate is 100%) comprising full maintenance, but the invention is not restricted to this, as long as can switch the predetermined pulsation rate more than 2 kinds according to the picture material classification.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
As content information, use from the broadcast station broadcast signal and/or EPG (electronic program guides) information that can obtain from foreign medium.Perhaps, in the time of can obtaining shooting condition information such as fuzzy additional information of the activity of relevant Input Image Content and shutter speed, available this information is differentiated the classification of answering display image content.
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also available this user's input video source selects indication information to distinguish the classification of answering display image content, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.Like this, also can constitute with user's indication information of relevant video adjustment project and distinguish the classification of answering display image content, pulsation rate is controlled to variable.
In the present embodiment, the frame rate of not conversion received image signal (60Hz) is supplied with LCD panel 16 with this signal former state, but also can be made the frame rate of picture signal variable certainly.And, by in the above-mentioned black demonstration time, extinguishing back-lighting light source 7, shorten back-lighting and light the time, can realize the long lifetime and the low consumption electrification of back-lighting light source 7.Here, when LED is used as back-lighting light source 7,, can be easier to control back-lighting brightness by controlling its drive current.
In sum, the liquid crystal indicator of present embodiment is approaching with black once-type display mode in the device of impulse type driving show state, suitably switch the ratio of the image demonstration time in 1 frame period according to the picture material classification, it is pulsation rate, thereby can suitably suppress the deterioration in image quality that factors such as stroboscopic, flicker cause, can realize the improvement of synthetic image quality.
The luminosity (back-lighting brightness) of back-lighting light source 7 can be changed with light the time (pulsation rate) of the back-lighting light source 7 in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 4 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Then, together with Figure 16 to Figure 23 embodiment of the present invention 4 is described; The part mark identical symbol identical with above-mentioned embodiment 3 omits its explanation.Here, Figure 16 is the functional block diagram that the liquid crystal indicator key component summary composition of present embodiment is shown, Figure 17 is the functional block diagram that the electrode drive portion of present embodiment is shown, Figure 18 is the diagrammatic illustration figure that the content instance of benchmark grayscale voltage deposit data portion in the invention liquid crystal indicator of present embodiment is shown, Figure 19 is a transmissivity that a routine liquid crystal is shown to the key diagram of the relation that applies voltage, Figure 20 is the diagrammatic illustration figure of liquid crystal response characteristic that the liquid crystal indicator of present embodiment is shown, Figure 21 illustrates the block diagram that the summary of benchmark grayscale voltage generating unit in the liquid crystal indicator of present embodiment is formed, Figure 22 illustrates the circuit diagram that the key component summary of signal-line driving circuit in the liquid crystal indicator of present embodiment is formed, and Figure 23 is the diagrammatic illustration figure of gamma (γ) characteristic of liquid crystal indicator when maintenance shows and during the impulse type demonstration that present embodiment is shown.
Present embodiment is identical with embodiment 3 basically, make back-lighting light source 7 always be illuminating state (lighting continuously), and then deceive the black once-type that shows signal writes scanning (restoring scanning) after utilizing interior image display signal of 1 frame period to write scanning to LCD panel 6, prevent that the activity that produces when live image shows is fuzzy, it is characterized by: control CPU10 writes regularly variable according to the black shows signal that the classification of picture material is controlled to the 5a of electrode drive portion.
In the embodiment 3, when pulsation rate changes for the black demonstration time is controlled to variable, make gamma characteristic roughly consistent, prepare map table in advance, and greyscale transformation portion 4 carries out conversion process with reference to this map table.In contrast, in the present embodiment, as shown in figure 16, be not equipped with greyscale transformation portion 4, change the grayscale voltage that is applied to LCD panel 6 corresponding to each pulsation rate, make gamma characteristic roughly consistent and replace the 5a of electrode drive portion.
Again, control CPU10 is variable together with being controlled to the black demonstration time, also controls light source drive part 8, makes the luminosity of back-lighting light source 7 variable, and perhaps control electrode drive division 5a makes the grayscale voltage that applies on the LCD panel 6 variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 7, also change the grayscale voltage that applies on the LCD panel 6 in electrode drive portion 5 simultaneously, even so that shorten lighting the time of back-lighting light source 7, the relation of received image signal and display brightness is also fixing.
Then, describe the composition of the electrode drive 5a of portion in detail, the pulsation rate variable operation of black shows signal and the grayscale voltage variable operation that is applied to LCD panel 6.As shown in figure 17, the ingredient of the 5a of this electrode drive portion comprises benchmark grayscale voltage deposit data portion 31, benchmark grayscale voltage generating unit 32, scan line drive circuit 33 and signal-line driving circuit 34.
Carry out impulse type when showing, the sweep signal of supplying with the sweep trace (grid line Y) of LCD panel 6 from scan line drive circuit 33 has 2 scanning line selection times in 1 frame period: the grayscale voltage that will adapt to image display signal writes image that pixel electrode uses and shows with select time and will adapt to the voltage of deceiving shows signal and write the black demonstration select time that pixel electrode is used.Therefore, as shown in figure 14, each grid line Y forms 2 high level with different timings in 1 frame period.Signal-line driving circuit 34 is alternately exported grayscale voltage corresponding with image display signal and the voltage corresponding with black shows signal from each signal wire (data line X) to LCD panel 6.Like this, behind the image display signal of selecting to make pixel cell show certain hour for the 1st time, then make pixel cell forcibly deceive demonstration with the 2nd selection.
Here, establish black the demonstration and selected according to pulsation rate, deceive demonstration with the sweep trace more than the multirow or below the multirow in the sweep trace of select time selecting image to show with select time.So, can apply the voltage that adapts to black shows signal on the signal wire with select time in black the demonstration, make each sweep trace deceive demonstration.By the suitable gated sweep driving circuit 33 of control CPU10, realize the selection of this black shows signal writing line, picture signal writing line, thereby to keep more than the multirow or the state at following interval scan image shows signal writing line and black shows signal writing line successively respectively.
Control CPU10 also carries out the image display signal of each frame and the switching controls of black shows signal.When paying close attention to 1 pixel column, show select time, supply with LCD panel 6 image display signals,, then supply with black shows signal at black demonstration select time to another row from signal drive circuit 34 at image to certain row.Like this, make the ratio of the black demonstration time in 1 frame period variable, can realize that the impulse type of each pulsation rate shows.
When carrying out maintenance demonstration (pulsation rate is 100%), signal-line driving circuit 34 is supplied with received image signals, also utilize control CPU10 gated sweep driving circuit 33 simultaneously, in 1 frame period, scan each line (not deceiving writing of shows signal) successively.Thus, can realize that pulsation rate is 100% conventional maintenance demonstration.
The variable operation of the grayscale voltage that applies on the LCD panel 6 then, is described.The benchmark grayscale voltage data that benchmark grayscale voltage generating unit 32 is deposited according to benchmark grayscale voltage deposit data portion 31 are supplied with the benchmark grayscale voltage to signal-line driving circuit 34.Here, as shown in figure 18, in the benchmark grayscale voltage deposit data portion 31, deposit in another district of ROM corresponding with each pulsation rate (here, respectively with pulsation rate be 100% maintenance when showing and pulsation rate be that 50% impulse type is corresponding when showing) benchmark grayscale voltage data, and CPU10 selects indication to these data by control, and they are outputed to benchmark grayscale voltage generating unit 32.The reference voltage data that setting benchmark grayscale voltage deposit data portion 31 deposits is as follows.
At first, corresponding benchmark grayscale voltage data when setting with maintenance demonstration (pulsation rate is 100%), so that according to the relation that applies voltage and liquid crystals transmit rate shown in Figure 19 (" V-T curve "), making the relation of display gray scale and display brightness (liquid crystals transmit rate) form gamma γ for example is 2.2 relation.Here, when for example shows signal number of greyscale levels (being the video data number) is 256 grades (8), set and deposit and 0,32,64,96,128,160,224,255 suitable voltage data V0, V32 ..., V255, and to the gray scale beyond this benchmark gray scale of depositing, by with the linear said reference grayscale voltage of dividing of resistance, obtain the whole grayscale voltages that apply on the LCD panel 6.
On the other hand, benchmark grayscale voltage data when carrying out impulse type demonstration (pulsation rate is 50%), not directly to determine from V-T curve shown in Figure 19, but the time of the display brightness (transmissivity) when asking impulse type shown in Figure 20 to show change in the relation of brightness integrated value I and the voltage T that liquid crystal is applied in 1 frame period, determined.The brightness integrated value changes because of liquid crystal response speed.Liquid crystal response speed is again because of display gray scale changes, so carry out impulse type when showing, the relation that applies voltage and liquid crystals transmit rate (brightness) shown in Figure 19 is false.That is, the gray scale that the grayscale voltage of maintenance when showing do not reach hope of carrying out of the V-T curve of Figure 19 decision shows.
Therefore, carry out impulse type when showing, remeasure brightness integrated value and the relation that applies voltage in 1 frame period, different benchmark grayscale voltage data when showing with maintenance to set.When setting these benchmark grayscale voltage data, it is 2.2 relation that the relation of setting the integrated value I of display gray scale and display brightness (liquid crystals transmit rate) for forms gamma γ for example.
Here, when for example shows signal number of greyscale levels (being the video data number) is 256 grades (8), set and deposit and 0,32,64,96,128,160,224,255 suitable voltage data V0, V32 ..., V255, and to the gray scale beyond this benchmark gray scale of depositing, by with the linear said reference grayscale voltage of dividing of resistance, obtain the whole grayscale voltages that apply on the LCD panel 6.
As shown in figure 21 benchmark grayscale voltage generating unit 32 utilize numerical data V0, V32 that DA transducer 51 will obtain from benchmark grayscale voltage deposit data portion 31 ..., after V255 carries out D/A (D/A) conversion, suitably amplify by enlarging section 52, thus with adjusted benchmark grayscale voltage VA0, VA32 ..., VA255 supplies with the signal-line driving circuit 34 comprise source electrode driver etc.As shown in figure 22, signal-line driving circuit 34 with the resistance dividing mode connect benchmark grayscale voltage VA0, VA32 ..., VA255 each input terminal, with the generation whole grayscale voltages corresponding, thereby can show 8 image display signal with image display signal.
Here, the grayscale voltage that produces 9 kinds of benchmark gray scales 0,32,64,96,128,160,192,224,255 of per 32 kinds of gray scales has been described, and divide other grayscale voltages of generation with resistance, but be not limited thereto, for example certainly also can be used for the grayscale voltage of the benchmark gray scale of per 16 kinds of gray scales etc.
In sum, according to control signal from control CPU10, to carry out respectively maintenance that benchmark grayscale voltage deposit data portion 31 deposits when showing (pulsation rate is 100%) benchmark grayscale voltage data or carry out the benchmark grayscale voltage data of impulse type when showing (pulsation rate is 50%) and read into benchmark grayscale voltage generating unit 32, and according to these benchmark grayscale voltage data, the grayscale voltage that LCD panel 6 is applied corresponding to each gray level decision of received image signal.
Thereby, as shown in figure 23, when carrying out maintenance demonstration or impulse type demonstration, can both prevent that the gamma characteristic of following the black liquid crystal response velocity contrast that inserts each display gray scale that produces to cause from changing, keep desirable show state, and can suppress to produce the deterioration in image quality that the gamma characteristic variation brings.
In the present embodiment liquid crystal indicator,, carry out and identical running shown in the embodiment 3 according to answering the display image content classification to make pulsation rate how change the aspect, thereby detailed.
Make on the structure as enforcement mode 3, greyscale transformation portion is set, the gray level of conversion received image signal, thereby when the grayscale voltage that applies on the LCD panel can be changed corresponding to received image signal, in fact the view data of supplying with control CPU10 is carried out the position compression, greyscale transformation may make display capabilities reduce.
In contrast, as present embodiment, by adjusting the benchmark grayscale voltage itself of supplying with signal-line driving circuit 34, can keep 8 display capabilities constant, and suppressing gamma characteristic changes, during grey scale change that for example display gray scale grade etc. is delicate, do not show the uncontinuity of striated yet, can realize high-quality demonstration.
Certainly, also can in above-mentioned embodiment 1～3, use the such structure of above-mentioned embodiment 4: grayscale voltage that LCD panel is applied can be changed with each pulsation rate corresponding to each gray level of received image signal.
Illustrate that then the user can change the liquid crystal indicator of pulsation rate arbitrarily, promptly embodiment 5～8.
Together with Figure 24 to Figure 29 embodiments of the present invention 5 are described.Here, Figure 24 is the functional block diagram that the liquid crystal indicator key component summary composition of present embodiment is shown, Figure 25～Figure 27 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of present embodiment, Figure 28 is that the pulsation rate that the liquid crystal indicator of present embodiment is shown is switched the routine key diagram of running, and Figure 29 is that the pulsation rate that the liquid crystal indicator of present embodiment is shown is switched the key diagram of setting the picture example.
As shown in figure 24, the present embodiment tool be equipped with the electrode drive portion 15 have liquid crystal layer drives described LCD panel 16 with the active array type LCD panel 16 that this liquid crystal layer is applied the electrode that sweep signal and data-signal use, according to input signal data electrode and scan electrode and to use, the following light source drive part 18 of penetrating type back-lighting light source 17 and being controlled the intermittence that back-lighting light source 17 extinguished/lights in the 1 vertical demonstration time (1 frame period) at the back side that is configured in described LCD panel 16.
Also be equipped with the frame rate transformation component 13 that the frame rate of received image signal is transformed into high frequency, the greyscale transformation portion 14 of the gray level of conversion received image signal, extract the synchronizing signal extraction unit 19 of synchronizing signal from received image signal, receive the telepilot photographic department 21 of user with the indicator signal of unshowned telepilot input, and detect and analyze indicator signal that telepilot photographic department 21 receives and the vertical synchronizing signal extracted according to synchronizing signal extraction unit 19 makes the control signal of the timing that back-lighting light source 17 lights/extinguish output to the control CPU20 of light source drive part 18 control.
Control CPU20 is variable together with being controlled to the lighting the time of back-lighting light source 17 (image shows the time), also control light source drive part 18, make the luminosity of back-lighting light source 17 variable, perhaps control greyscale transformation portion 14, make the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 17, also in greyscale transformation portion 14 conversion received image signal gray levels, even so that shorten light the time (the lighting rate) of back-lighting light source 17, the relation of received image signal and display brightness is also fixing simultaneously.
Do not change the luminosity of back-lighting light source 17 and reduce pulsation rate, the then low pixel damage of brightness, thereby conversion received image signal gray level strengthens display brightness, improves the contrast of dark gray; Perhaps strengthen pulsation rate, the then high pixel damage of brightness, thereby conversion received image signal gray level reduces display brightness, improves the contrast of bright gray scale.Thus, can realize that distinct image shows.
Above-mentioned control CPU20 is control frame frequency conversion part 13 as required also, makes the frame rate of the picture signal of supplying with LCD panel 16 variable.Frame rate transformation component 13 for example has frame memory, after storing the image of 1 frame share of received image signal into frame memory, according to the control signal from control CPU20, output transform becomes the picture signal of regulation frame rate, thereby received image signal is carried out the time shaft compression.
As above-mentioned back-lighting light source 17, except that under penetrate the type fluorescent light, penetrate type or other under also available according to type led light source, EL light source etc.Especially LED (light emitting diode), its response speed is tens ns～hundreds of ns, compares with the ms level response speed of fluorescent light, response is good, thus can realize being more suitable for switching light/extinguish state.
The liquid crystal indicator of present embodiment utilizes full screen flash type back-lighting lighting method to prevent that the activity that produces when live image shows is fuzzy.Promptly, from finishing whole scannings (image writes) of display frame, after postponing the predetermined stipulated time, back-lighting light source 17 is applied drive waveforms, thereby light in the time at the back-lighting shown in the oblique line part of Figure 25～Figure 27, make 17 pairs of entire display screen curtains of back-lighting light source illuminate (flash of light) simultaneously.
Here, can change the back-lighting shown in Figure 25～Figure 27 bend part according to the indication of customer controller (not shown) input and light the time, the image that promptly changes in 1 frame period shows the time (pulsation rate), thereby the deterioration in image quality that factors such as suitably inhibition is fuzzy with the activity of generations such as picture material and image type, stroboscopic, flicker cause realizes the improvement of synthetic image quality to the user.
For example, among Figure 25 (a)～(c), the running example of following situation is shown: pulsation rate is controlled to changes 3 grades, be respectively 30%, 40%, 50%.Reduce stroboscopic, the flicker cause the picture quality defective time, shown in Figure 25 (a), write scanning from finishing image, after only postponing the predetermined liquid crystal response time (being 1/4 frame period) here, back-lighting light source 17 is lighted, and the image that remains to next frame writes scanning beginning, promptly keeps one section back-lighting to light the time (image shows the time).
Do not produce stroboscopic, the image deflects that cause of flicker and will take in sail the fuzzy picture quality defective that causes the time, shown in Figure 25 (b), (c), postponing back-lighting lights regularly or makes back-lighting to extinguish regularly ahead of time, shorten back-lighting and light the time (image shows the time), thereby reduce pulsation rate.
In the example shown in Figure 25, need be in the time that deducts from 1 frame period after liquid crystal response time and back-lighting are lighted the time, the full screen that spreads all over LCD panel 16 writes and scans the picture signal of 1 frame share, thereby the frame rate (60Hz) of received image signal is transformed into its 240Hz of 4 times by frame rate transformation component 13, but light the time in order fully to guarantee back-lighting, by control CPU20 controlled frequency transformation component 13, for example the frame rate with received image signal further is transformed into high frequency (480Hz), as shown in figure 26, write sweep time thereby shorten image, can make pulsation rate increase to 62.5%.
Therefore, when the image deflects that stroboscopic, flicker cause are remarkable, be controlled to changeable frequency according to user's indication, the frame rate of picture signal is raise, thereby the lengthening back-lighting is lighted the time, can obtain activity live image (live image is fuzzy, and then picture quality such as stroboscopic, flicker defective reduces) smoothly.Like this, by as required the frame rate of input picture being transformed into high frequency, the setting degree of freedom that can make back-lighting light the time improves.
When the picture quality defective that stroboscopic, flicker cause is remarkable, as shown in figure 27, indicate according to the user, be controlled to and ignore the liquid crystal response time, always make back-lighting light source 17 full rate light (lighting continuously), can prevent these picture quality defectives fully thereby pulsation rate is switched to 100% (full maintenance demonstration).
In sum, in the present embodiment, can indicate according to the user and switch 5 grades of full maintenances demonstrations (pulsation rate is 100%) and impulse type demonstration (pulsation rate is 62.5%, 50%, 40%, 30%).This switch key that can constitute the setting of each pressing operation telepilot (not shown) switches successively, and maybe can constitute one side and show pulsation rate setting picture shown in Figure 29, one side remote controller (not shown) right and left key, thus can select to switch the pulsation rate of wishing.In the example shown in Figure 29, " smooth and easy activity " (maintenance demonstration) and " clear-cut activity " (impulse type demonstration) are carried out showing at screen (OSD), search so that do 5 grades of switchings.
In the above-mentioned present embodiment, can light the time (image shows the time) (being pulsation rate) to the back-lighting in 1 frame period and carry out 5 grades of switchings below 100%, but the invention is not restricted to this, as long as can indicate the predetermined pulsation rate more than 2 kinds of any switching according to the user.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also indication information is selected in available this user's input video source, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.
Also the adjustment indication information of the relevant display brightness of available subscribers and contrast etc. is controlled to pulsation rate variable.For example, menu is set the video of picture and adjusted project, adjust when indicating into the increasing contrast, can control, switch to the increasing pulsation rate indication linkedly, display brightness is improved with this.
Be not limited to such user's direct control switch pulse rate, also can constitute and relate to various videos and adjust the user of projects indication linkedly to be controlled to pulsation rate indirectly variable.
In sum, the liquid crystal indicator of present embodiment is in the device that approaches impulse type driving show state with full screen flash type back-lighting lighting mode, indicate suitable switching back-lighting to light the time according to the user, promptly the image in 1 frame period shows the ratio (pulsation rate) of time, thereby can suitably suppress the deterioration in image quality that factors such as stroboscopic, flicker cause, can realize the improvement of synthetic image quality the user.
The luminosity (back-lighting brightness) of back-lighting light source 17 can be changed with light the time (pulsation rate) of the back-lighting light source 17 in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 14 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Also can constitute and not be that above-mentioned embodiment makes the 17 full screen flashes of light of back-lighting light source own light (intermittently lighting) like that, but the lightproof unit of the LCD etc. of the transmittance time (image demonstration time) in 1 frame period of restriction is set between the back-lighting light source of Chang Liang (lighting continuously) and LCD panel, the image display light is modulated.
Then, together with Figure 30 to Figure 32 embodiment of the present invention 6 is described; The part mark identical symbol identical with embodiment 5 omits its explanation.Here, Figure 30～Figure 32 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of present embodiment.
The liquid crystal indicator of present embodiment utilizes sweep type back-lighting lighting mode to prevent that the activity that produces when live image shows is fuzzy, and its basic functional block diagram is with above this block diagram together with the embodiment 15 of Figure 17 elaboration is identical.Difference is: will by with many of sweep trace configured in parallel under penetrate regulation radical (number) in type or the other back-lighting light source 17 that constitutes according to type led light source, EL light source etc. as 1 luminous zone, and in 1 frame period successively scanning light them.Control CPU20 is according to the vertical/horizontal synchronizing signal (sweep signal) of synchronizing signal extraction unit 19 extractions and user's indicator signal of telepilot photographic department 21 receptions, and control scans the timing of each luminous zone of lighting the back-lighting light source successively.
Promptly, as shown in figure 30, in the present embodiment, from finishing (image writes) of certain horizontal line group (demonstration dividing regions), after considering the delay share of liquid crystal response, the luminous zone (certain fluorescent light group or LED group) of the pairing back-lighting light source 17 of this horizontal line group is lighted.Repeat this operation one by one in vertical direction.Thus, shown in the part of the oblique line among Figure 30～Figure 32, can make the back-lighting time of lighting write the scanning position corresponding to picture signal, be unit with the luminous zone, along with the time experience, shifts successively.
Here, light the time according to the user with the back-lighting of each luminous zone shown in indication change Figure 30～Figure 32 bend part of telepilot (not shown) input, the image that promptly changes in 1 frame period shows the time (pulsation rate), thereby the deterioration in image quality that factors such as the activity that suitably suppresses to produce with picture material is blured, stroboscopic, flicker cause realizes the improvement of synthetic image quality to the user.
In the present embodiment, control CPU20 is variable together with being controlled to the lighting the time of back-lighting light source 17 (image shows the time), also controls light source drive part 18, makes the luminosity of back-lighting light source 17 variable, perhaps control greyscale transformation portion 14, make the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 17, also in greyscale transformation portion 14 conversion received image signal gray levels, even so that shorten light the time (the lighting rate) of back-lighting light source 17, the relation of received image signal and display brightness is also fixing simultaneously.
Even greyscale transformation portion 14 conversion received image signal gray levels so that change pulsation rate, are also carried out the gamma characteristic uniform images and are shown.That is, among the ROM etc. each pulsation rate is deposited the map table (LUT) that the received image signal gray scale transformation is become gamma (gamma) unanimity in advance, and greyscale transformation portion 14 is with reference to this map table conversion received image signal gray level.Like this, just can suppress to produce gamma characteristic and change the deterioration in image quality that causes.
Above-mentioned control CPU20 is control frame frequency conversion part 13 as required also, makes the frame rate of the picture signal of supplying with LCD panel 16 variable.Frame rate transformation component 13 for example has frame memory, after storing the image of 1 frame share of received image signal into frame memory, according to the control signal from control CPU20, output transform becomes the picture signal of regulation frame rate, thereby received image signal is carried out the time shaft compression.
For example, among Figure 30 (a)～(c), the running example of following situation is shown: the image demonstration time in 1 frame period is controlled to changes 3 grades, be respectively 5/8 cycle, 1/2 frame period, 3/8 frame period.Reduce stroboscopic, the flicker cause the picture quality defective time, shown in Figure 30 (a), finish image from certain horizontal line group and write scanning, after only postponing the predetermined liquid crystal response time (being 1/4 frame period) here, the pairing back-lighting light source 17 of this horizontal line group is lighted, and the image that remains to next frame writes scanning beginning, promptly keeps one section back-lighting to light the time (image shows the time).
Take in sail when bluring the picture quality defective that causes, shown in Figure 30 (b), (c), postpone back-lighting and light regularly or make back-lighting to extinguish regularly ahead of time, the shortening back-lighting is lighted the time (image shows the time), thereby reduces pulsation rate.Here, for the uneven luminance that prevents that the screen position from causing, each frame determines the back-lighting of each luminous zone to light the time, and makes this time constant in 1 frame.
In the example shown in Figure 30, write and scan the picture signal of 1 frame share at the full screen that in 1 frame period, spreads all over LCD panel 16, thereby the frame rate (60Hz) of received image signal is not applied conversion, but light the time in order fully to guarantee back-lighting, by control CPU20 controlled frequency transformation component 13, for example the frame rate with received image signal further is transformed into high frequency (240Hz), as shown in figure 31, write sweep time thereby shorten image, can make pulsation rate increase to 72%.
Therefore, when the image deflects that stroboscopic, flicker cause are remarkable, be controlled to changeable frequency according to user's indication, the frame rate of picture signal is raise, thereby the lengthening back-lighting is lighted the time, can obtain activity live image (live image is fuzzy, and then picture quality such as stroboscopic, flicker defective reduces) smoothly.Like this, by as required the frame rate of input picture being transformed into high frequency, the setting degree of freedom that can make back-lighting light the time improves.
When the picture quality defective that stroboscopic, flicker cause is remarkable, shown in figure 32, indicate according to the user, be controlled to and ignore the liquid crystal response time, always make back-lighting light source 17 full screens light (lighting continuously), pulsation rate was switched to for 100% (full maintenance shows), thereby can prevent these picture quality defectives fully.
In sum, in the present embodiment, can indicate according to the user and switch 5 grades of full maintenances demonstrations (pulsation rate is 100%) and impulse type demonstration (pulsation rate is 72%, 62.5%, 50%, 37.5%).Identical with above-mentioned embodiment 5, this switch key that can constitute the setting of each pressing operation telepilot (not shown) switches successively, as shown in figure 28, maybe can constitute one side and show pulsation rate setting picture shown in Figure 29, one side remote controller (not shown) right and left key, thus can select to switch the pulsation rate of wishing.
In the above-mentioned present embodiment, can light the time (image shows the time) (being pulsation rate) to the back-lighting in 1 frame period and carry out 5 grades of switchings below 100%, but the invention is not restricted to this, as long as can indicate the predetermined pulsation rate more than 2 kinds of any switching according to the user.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also indication information is selected in available this user's input video source, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.
Also the adjustment indication information of the relevant display brightness of available subscribers and contrast etc. is controlled to pulsation rate variable.For example, menu is set the video of picture and adjusted project, adjust when indicating into the increasing contrast, can control, switch to the increasing pulsation rate indication linkedly, display brightness is improved with this.
Be not limited to such user's direct control switch pulse rate, also can constitute and relate to various videos and adjust the user of projects indication linkedly to be controlled to pulsation rate indirectly variable.
In the above-mentioned embodiment, the back-lighting light source is divided into 8 luminous zones (horizontal line group), scanning is lighted successively, but obviously as long as luminous dividing regions number is more than 2, and each luminous zone is not limited to the zone that horizontal direction (direction parallel with sweep trace) is divided back-lighting light source 17.On this aspect, in the time of will penetrating type LED as back-lighting light source 17 down, can make the setting degree of freedom height of luminous dividing regions.And, when LED is used as back-lighting light source 17, by controlling its amount of drive current, also can be than being easier to control back-lighting brightness.
In sum, in the liquid crystal indicator of present embodiment, when the show state that the back-lighting lighting mode that uses sweep type drives near impulse type, light the ratio (pulsation rate) of the image demonstration time in time, i.e. 1 frame period by the back-lighting that suitably switches each light-emitting zone corresponding to the user, suitably the deterioration in image quality that causes of factors such as fuzzy, the stroboscopic of inhibition activity, flicker realizes the improvement of synthetic image quality to the user.
The luminosity (back-lighting brightness) of back-lighting light source 17 can be changed with light the time (pulsation rate) of the back-lighting light source 17 in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 14 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Also can constitute be not above-mentioned embodiment like that back-lighting light source 17 itself is divided into a plurality of luminous zones and successively scanning light (intermittently light), but between the back-lighting light source and LCD panel of Chang Liang (lighting continuously), lightproof unit to the LCD of the transmittance time in 1 frame period of restriction of each dividing regions (image show time) etc. is set, the image display light is modulated.
Then, together with Figure 33 to Figure 35 embodiment of the present invention 7 is described; The part mark identical symbol identical with embodiment 6 omits its explanation.Here, Figure 33 is the functional block diagram that the liquid crystal indicator key component summary composition of present embodiment is shown, Figure 34 is used to illustrate the sequential chart of electrode drive running of the liquid crystal indicator of present embodiment, and Figure 35 is the key diagram of basic functional principle that is used to illustrate the liquid crystal indicator of present embodiment.
As shown in figure 33, the liquid crystal indicator of present embodiment makes back-lighting light source 17 always be illuminating state (lighting continuously), and then deceive the black once-type that shows signal writes scanning (restoring scanning) after utilizing interior image display signal of 1 frame period to write scanning to LCD panel 16, the activity that produces when preventing movable the demonstration is fuzzy, it is characterized by: control CPU20 writes regularly variable according to the black shows signal that user's indication input is controlled to electrode drive portion 15.
That is, electrode drive portion 15 carries out sequence of operations in 1 frame period: except that selecting each sweep trace to be used for the image demonstration, also select sweep trace to be used for black the demonstration once more, select data line supply received image signal and black shows signal according to this again simultaneously.Like this, make the time (black demonstration time) that produces the demonstration black signal between certain two field picture demonstration and the demonstration of next frame image.Here, make the black shows signal Displaying timer (time delay) that picture signal is write regularly indicate variation with the user.
Again, control CPU20 is variable together with being controlled to the black demonstration time, also controls light source drive part 18, makes the luminosity of back-lighting light source 17 variable, perhaps controls greyscale transformation portion 14, makes the gray level of received image signal variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 17, simultaneously also in greyscale transformation portion 14 conversion received image signal gray levels, even show the time so that shorten image, the relation of received image signal and display brightness is also fixing.
Figure 34 is the sequential chart of the sweep trace (grid line) of relevant LCD panel 16.In 1 frame period, staggering a little periodically starts grid line Y1～Y480 successively, so that by signal wire (data line) picture signal is write pixel cell.Start whole 48 grid lines, picture signal is write pixel cell, thereby finished for 1 frame period.
At this moment,, after only postponing to indicate the time of decision, start grid line Y1 ~ Y480 once more, show black current potential each pixel cell is supplied with by data line X according to the user from being used for the startup that picture signal writes.Thus, each pixel cell becomes black show state.That is, each grid line Y becomes high level 2 times with different timings in 1 frame period.Make the pixel data of pixel cell demonstration certain hour by the 1st time selection after, then make pixel cell forcibly deceive demonstration with the 2nd selection.
For example, among Figure 35 (a)～(c), the running example of following situation is shown: the image demonstration time that is controlled in 1 frame period can change 3 grades, is respectively 3/4 frame period, 1/2 frame period, 1/4 frame period.Reduce stroboscopic, the flicker cause the picture quality defective time, shown in Figure 35 (a), from being finished image, certain pixel writes scanning, after only postponing for 3/4 frame period, start writing of black shows signal, and the image that remains to next frame writes scanning beginning, promptly keeps the one black demonstration period (1/4 frame period).
Take in sail when bluring the picture quality defective that causes, shown in Figure 35 (b), (c), extinguish regularly ahead of time by making back-lighting, the service time (the non-demonstration time of picture signal) of the black shows signal of lengthening, thus reduce pulsation rate.Here, for the uneven luminance that prevents that the screen position from causing, each frame decision writes regularly black to each horizontal line image and writes regularly (time delay), and makes this timing constant in 1 frame.
When the picture quality defective that stroboscopic, flicker cause is remarkable, shown in figure 32, indicate according to the user, be controlled to the scanning that writes of not carrying out black shows signal, the black demonstration time of cancellation, pulsation rate was switched to for 100% (full maintenance shows), thereby can prevent these picture quality defectives fully.
In sum, in the present embodiment, can indicate according to the user and switch 4 grades of full maintenances demonstrations (pulsation rate is 100%) and impulse type demonstration (pulsation rate is 75%, 50%, 25%).Identical with above-mentioned embodiment 5, this switch key that can constitute the setting of each pressing operation telepilot (not shown) switches successively, as shown in figure 28, maybe can constitute one side and show pulsation rate setting picture shown in Figure 29, one side remote controller (not shown) right and left key, thus can select to switch the pulsation rate of wishing.
In the above-mentioned present embodiment, can light the time (image shows the time) (being pulsation rate) to the back-lighting in 1 frame period and carry out 4 grades of switchings below 100%, but the invention is not restricted to this, as long as can indicate the predetermined pulsation rate more than 2 kinds of any switching according to the user.This is self-evident.For example, only can constituting alternatively, the switch pulse type shows and maintenance demonstration (turn-offing impulse type shows).
In this image display device, making the user on the structure can set picture and selecting and indicate input video source (video configuration) from menu, so that " standard ", " film ", " recreation " wait each input video source to carry out optimum picture quality (video output characteristics) adjustment.Also indication information is selected in available this user's input video source, pulsation rate is controlled to variable.For example, in menu is set video source (video configuration) options of picture, select and during indication " recreation ", can control, make pulsation rate and this selection switch to bigger in linkage.
Also the adjustment indication information of the relevant display brightness of available subscribers and contrast etc. is controlled to pulsation rate variable.For example, menu is set the video of picture and adjusted project, adjust when indicating into the increasing contrast, can control, switch to the increasing pulsation rate indication linkedly, display brightness is improved with this.
Be not limited to such user's direct control switch pulse rate, also can constitute and relate to various videos and adjust the user of projects indication linkedly to be controlled to pulsation rate indirectly variable.
In the present embodiment, the frame rate of not conversion received image signal (60Hz) is supplied with LCD panel 16 with this signal former state, but also can be made the frame rate of picture signal variable certainly.And, by in the above-mentioned black demonstration time, extinguishing back-lighting light source 17, shorten back-lighting and light the time, can realize the long lifetime and the low consumption electrification of back-lighting light source 17.Here, when LED is used as back-lighting light source 17,, can be easier to control back-lighting brightness by controlling its drive current.
In sum, the liquid crystal indicator of present embodiment is approaching with black once-type display mode in the device of impulse type driving show state, indicate suitable switching to deceive the demonstration time (the non-demonstration of image time) according to the user, promptly the image in 1 frame period shows the ratio (being pulsation rate) of time, thereby can suitably suppress the deterioration in image quality that factors such as stroboscopic, flicker cause, can realize the improvement of synthetic image quality the user.
Make the luminosity (back-lighting brightness) of back-lighting light source 17 show that the ratio (pulsation rate) of time changes again with the image in 1 frame period, simultaneously also in the gray level of greyscale transformation portion 14 conversion received image signals, thereby the relation of received image signal and display brightness always is maintained fixed, irrelevant with pulsation rate.
Then, together with the Figure 18 to Figure 23 that uses in Figure 36, Figure 37, the embodiment 4 embodiment of the present invention 8 is described; The part mark identical symbol identical with above-mentioned embodiment 4 omits its explanation.Here, Figure 36 is the functional block diagram that the liquid crystal indicator key component summary composition of present embodiment is shown, and Figure 37 is the functional block diagram that the electrode drive portion of present embodiment is shown.
Present embodiment and embodiment 7 are basic identical, make back-lighting light source 17 always be illuminating state (lighting continuously), and then deceive the black once-type that shows signal writes scanning (restoring scanning) after utilizing interior image display signal of 1 frame period to write scanning to LCD panel 16, prevent that the activity that produces when live image shows is fuzzy, it is characterized by: control CPU10 writes regularly variable according to the black shows signal that user's indication input is controlled to the 15a of electrode drive portion.
In the embodiment 7, when pulsation rate changes in order being controlled to variable in the black demonstration time, to make gamma characteristic roughly consistent, prepare map table in advance, and greyscale transformation portion 14 to carry out conversion process with reference to this map table.In contrast, in the present embodiment, as shown in figure 36, be not equipped with greyscale transformation portion 14, change the grayscale voltage that is applied to LCD panel 16 corresponding to each pulsation rate, make gamma characteristic roughly consistent and replace the 15a of electrode drive portion.
Again, control CPU20 is variable together with being controlled to the black demonstration time, also controls light source drive part 18, makes the luminosity of back-lighting light source 17 variable, and perhaps control electrode drive division 15a makes the grayscale voltage that applies on the LCD panel 16 variable.Here, improve the luminosity (back-lighting brightness) of back-lighting light source 17, also change the grayscale voltage that applies on the LCD panel 16 at the 15a of electrode drive portion simultaneously, even so that shorten lighting the time of back-lighting light source 17, the relation of received image signal and display brightness is also fixing.
Then, describe the composition of the electrode drive 15a of portion in detail, the pulsation rate variable operation of black shows signal and the grayscale voltage variable operation that is applied to LCD panel 16.As shown in figure 37, the ingredient of the 15a of this electrode drive portion comprises benchmark grayscale voltage deposit data portion 131, benchmark grayscale voltage generating unit 132, scan line drive circuit 133 and signal-line driving circuit 134.
Carry out impulse type when showing, the sweep signal of supplying with the sweep trace (grid line Y) of LCD panel 16 from scan line drive circuit 133 has 2 scanning line selection times in 1 frame period: the grayscale voltage that will adapt to image display signal writes image that pixel electrode uses and shows with select time and will adapt to the voltage of deceiving shows signal and write the black demonstration select time that pixel electrode is used.Therefore, as shown in figure 34, each grid line Y forms 2 high level with different timings in 1 frame period.Signal-line driving circuit 134 is alternately exported grayscale voltage corresponding with image display signal and the voltage corresponding with black shows signal from each signal wire (data line X) to LCD panel 16.Like this, behind the image display signal of selecting to make pixel cell show certain hour for the 1st time, then make pixel cell forcibly deceive demonstration with the 2nd selection.
Here, establish black the demonstration and selected according to pulsation rate, deceive demonstration with the sweep trace more than the multirow or below the multirow in the sweep trace of select time selecting image to show with select time.So, can apply the voltage that adapts to black shows signal on the signal wire with select time in black the demonstration, make each sweep trace deceive demonstration.By the suitable gated sweep driving circuit 133 of control CPU20, realize the selection of this black shows signal writing line, picture signal writing line, thereby to keep more than the multirow or the state at following interval scan image shows signal writing line and black shows signal writing line successively respectively.
Control CPU20 also carries out the image display signal of each frame and the switching controls of black shows signal.When paying close attention to 1 pixel column, show select time, supply with LCD panel 16 image display signals,, then supply with black shows signal at black demonstration select time to another row from signal drive circuit 134 at image to certain row.Like this, make the ratio of the black demonstration time in 1 frame period variable, can realize that the impulse type of each pulsation rate shows.
When carrying out maintenance demonstration (pulsation rate is 100%), signal-line driving circuit 134 is supplied with received image signals, also utilize control CPU20 gated sweep driving circuit 133 simultaneously, in 1 frame period, scan each line (not deceiving writing of shows signal) successively.Thus, can realize that pulsation rate is 100% conventional maintenance demonstration.
The variable operation of the grayscale voltage that applies on the LCD panel 16 then, is described.The benchmark grayscale voltage data that benchmark grayscale voltage generating unit 132 is deposited according to benchmark grayscale voltage deposit data portion 131 are supplied with the benchmark grayscale voltage to signal-line driving circuit 134.Here, as shown in figure 18, in the benchmark grayscale voltage deposit data portion 131, deposit in another district of ROM corresponding with each pulsation rate (here, respectively with pulsation rate be 100% maintenance when showing and pulsation rate be that 50% impulse type is corresponding when showing) benchmark grayscale voltage data, and CPU20 selects indication to these data by control, and they are outputed to benchmark grayscale voltage generating unit 132.The reference voltage data that setting benchmark grayscale voltage deposit data portion 131 deposits is as follows.
At first, corresponding benchmark grayscale voltage data when setting with maintenance demonstration (pulsation rate is 100%), so that according to the relation that applies voltage and liquid crystals transmit rate shown in Figure 19 (" V-T curve "), making the relation of display gray scale and display brightness (liquid crystals transmit rate) form gamma γ for example is 2.2 relation.Here, when for example shows signal number of greyscale levels (being the video data number) is 256 grades (8), set and deposit and 0,32,64,96,128,160,224,255 suitable voltage data V0, V32 ..., V255, and to the gray scale beyond this benchmark gray scale of depositing, by with the linear said reference grayscale voltage of dividing of resistance, obtain the whole grayscale voltages that apply on the LCD panel 16.
On the other hand, benchmark grayscale voltage data when carrying out impulse type demonstration (pulsation rate is 50%), not directly to determine from V-T curve shown in Figure 19, but the time of the display brightness (transmissivity) when asking impulse type shown in Figure 20 to show change in the relation of brightness integrated value I and the voltage T that liquid crystal is applied in 1 frame period, determined.The brightness integrated value changes because of liquid crystal response speed.Liquid crystal response speed is again because of display gray scale changes, so carry out impulse type when showing, the relation that applies voltage and liquid crystals transmit rate (brightness) shown in Figure 19 is false.That is, the gray scale that the grayscale voltage of maintenance when showing do not reach hope of carrying out of the V-T curve of Figure 19 decision shows.
Therefore, carry out impulse type when showing, remeasure brightness integrated value and the relation that applies voltage in 1 frame period, different benchmark grayscale voltage data when showing with maintenance to set.When setting these benchmark grayscale voltage data, it is 2.2 relation that the relation of setting the integrated value I of display gray scale and display brightness (liquid crystals transmit rate) for forms gamma γ for example.Here, when for example shows signal number of greyscale levels (being the video data number) is 256 grades (8), set and deposit and 0,32,64,96,128,160,224,255 suitable voltage data V0, V32 ..., V255, and to the gray scale beyond this benchmark gray scale of depositing, by with the linear said reference grayscale voltage of dividing of resistance, obtain the whole grayscale voltages that apply on the LCD panel 16.
As shown in figure 21 benchmark grayscale voltage generating unit 132 utilize numerical data V0, V32 that DA transducer 51 will obtain from benchmark grayscale voltage deposit data portion 131 ..., after V255 carries out D/A (D/A) conversion, suitably amplify by enlarging section 52, thus with adjusted benchmark grayscale voltage VA0, VA32 ..., VA255 supplies with the signal-line driving circuit 134 comprise source electrode driver etc.As shown in figure 22, signal-line driving circuit 134 with the resistance dividing mode connect benchmark grayscale voltage VA0, VA32 ..., VA255 each input terminal, with the generation whole grayscale voltages corresponding, thereby can show 8 image display signal with image display signal.
Here, the grayscale voltage that produces 9 kinds of benchmark gray scales 0,32,64,96,128,160,192,224,255 of per 32 kinds of gray scales has been described, and divide other grayscale voltages of generation with resistance, but be not limited thereto, for example certainly also can be used for the grayscale voltage of the benchmark gray scale of per 16 kinds of gray scales etc.
In sum, according to control signal from control CPU20, to carry out respectively maintenance that benchmark grayscale voltage deposit data portion 131 deposits when showing (pulsation rate is 100%) benchmark grayscale voltage data or carry out the benchmark grayscale voltage data of impulse type when showing (pulsation rate is 50%) and read into benchmark grayscale voltage generating unit 132, and according to these benchmark grayscale voltage data, the grayscale voltage that LCD panel 16 is applied corresponding to each gray level decision of received image signal.
Thereby, as shown in figure 23, when carrying out maintenance demonstration or impulse type demonstration, can both prevent that the gamma characteristic of following the black liquid crystal response velocity contrast that inserts each display gray scale that produces to cause from changing, keep desirable show state, and can suppress to produce the deterioration in image quality that the gamma characteristic variation brings.
In the present embodiment liquid crystal indicator, make pulsation rate how change the aspect, carry out and identical running shown in the embodiment 7 according to user's indication, thereby detailed.
Make on the structure as enforcement mode 7, greyscale transformation portion is set, the gray level of conversion received image signal, thereby when the grayscale voltage that applies on the LCD panel can be changed corresponding to received image signal, in fact the view data of supplying with control CPU20 is carried out the position compression, greyscale transformation may make display capabilities reduce.
In contrast, as present embodiment, by adjusting the benchmark grayscale voltage itself of supplying with signal-line driving circuit 134, can keep 8 display capabilities constant, and suppressing gamma characteristic changes, during grey scale change that for example display gray scale grade etc. is delicate, do not show the uncontinuity of striated yet, can realize high-quality demonstration.
Certainly, also can in above-mentioned embodiment 5～7, use the such structure of above-mentioned embodiment 8: grayscale voltage that LCD panel is applied can be changed with each pulsation rate corresponding to each gray level of received image signal.
In the invention described above embodiment 5～8, illustrated that the user who carries out the variable setting of relevant pulsation rate with unshowned telepilot indicates input, but the also available operating portion that is located at apparatus main body etc. carries out the user and indicates input certainly.
In the method (embodiment 1～4) according to the testing result automatic switchover pulsation rate of answering the display image content classification, not adding movable bluring with for example recreation (CG animation) image is prerequisite, strengthen pulsation rate, but handle fuzzy recreation (CG animation) image of interpolation activity to utilizing high vision, preferably reduce pulsation rate, blur defective to prevent the generation activity.Yet, even in this case, by as above-mentioned embodiment 5～8, constitute the user and can select pulsation rate arbitrarily, can set and meet the optimum pulse rate of answering display image.
As shown in figure 38, variable in this display device by display brightness being controlled to the outer illuminance (brightness) of this device environment for use, even periods of direct sunlight on display surface for example, indoor the carrying out under the situations such as audiovisual that does not work also can be realized the screen display of being convenient to watch to the user.Therefore, make pulsation rate bigger when preferably the outer illuminance of this device environment for use is bright, outer illuminance makes pulsation rate less when dark, the user sets the optimum pulse rate according to the light and shade (intensity of outer illuminance) of this device environment for use, thereby make except that preventing movable bluring the picture quality raising, can be convenient to also realize that the image that the user is convenient to watch that the display brightness modulation brings shows.
Especially illuminance size (surrounding brightness) automaticallyes switch under the situation of above-mentioned pulsation rate outside detected according to illuminance transducer, when for example being arranged on the display screen subregion on the sunny side facing to the direct sunlight place, the detected illumination error of illuminance transducer is big, best image brightness might can not be formed, but it is such by above-mentioned embodiment 5～8, constitute the user and can select pulsation rate arbitrarily, can set the optimum pulse rate of the outer illuminance that adapts to this device environment for use, total energy realizes that the image that the user is convenient to watch shows.
As everyone knows, as shown in figure 39, the temperature dependency of liquid crystal response speed is very big, especially during low temperature to the tracing property extreme difference of input signal, the response time lengthening.That is to say, when temperature is low in the advantageous device, guarantee the long liquid crystal response time, and liquid crystal responds fully and after reaching object brightness, lighting of startup back-lighting light source perhaps starts writing of black shows signal (image display signal).Therefore, temperature was set the optimum pulse rate in the user installed according to this, thereby made the picture quality raising except that preventing movable bluring, and also can suppress to produce hangover and wait residual image, improved the live image display quality.
When especially constituting according to the above-mentioned pulsation rate of temperature in the detected device of temperature sensor (machine dish temperature) automatic switchover, when for example being arranged on the display screen subregion facing to air-conditioning air draft place or on the sunny side facing to the direct sunlight place, the detected temperature error of temperature sensor is big, can not guarantee the optimal response time, may cause producing hangover and wait residual image, but pass through as above-mentioned embodiment 5～8, constitute the user and can select pulsation rate arbitrarily, total energy realizes the good live image of user is shown.
Can select pulsation rate arbitrarily by constituting the user, can demonstrate and have a mind to stiff activity (stroboscopic) or demonstrate the fuzzy movable video performances special such as (movable fuzzy) the user.
Industrial practicality
Liquid crystal indicator of the present invention shows and to produce when preventing that live image from showing by approaching impulse type Movable fuzzy, be fit to the monitor of liquid crystal TV set and computer etc.
Claims (13)
1. a liquid crystal indicator is provided with in 1 frame period and answers demonstration time and the non-demonstration time of display image signals to LCD panel, it is characterized in that, comprises
According to the information beyond the described picture signal detect the type classification that is used for the image that on described LCD panel, shows the unit and
According to the type classification of described detected image, be controlled to the variable unit of ratio of the picture signal demonstration time in described 1 frame period.
2. liquid crystal indicator according to claim 1 is characterized in that,
The demonstration time of described picture signal is lighting the time of back-lighting light source.
3. as liquid crystal indicator as described in the claim 2, it is characterized in that,
Make of the light time variation of the luminous intensity of this back-lighting light source with described back-lighting light source.
4. liquid crystal indicator as claimed in claim 2 is characterized in that,
Make of the light time variation of the gray level of received image signal with described back-lighting light source.
5. liquid crystal indicator as claimed in claim 2 is characterized in that,
The picture signal that makes and imported is applied to the light time variation of the grayscale voltage of described LCD panel with described back-lighting light source accordingly.
6. liquid crystal indicator as claimed in claim 1 is characterized in that,
Change the frame rate of received image signal according to the type classification of the detection of described image.
7. liquid crystal indicator as claimed in claim 1 is characterized in that,
The non-demonstration time of described picture signal is the time of described LCD panel being supplied with black shows signal.
8. liquid crystal indicator as claimed in claim 7 is characterized in that,
The luminous intensity of shining the back-lighting light source of described LCD panel changes with the service time of described black shows signal.
9. liquid crystal indicator as claimed in claim 7 is characterized in that,
Make of the service time variation of the gray level of received image signal with described black shows signal.
10. liquid crystal indicator as claimed in claim 7 is characterized in that,
The picture signal that makes and imported is applied to the service time variation of the grayscale voltage of described LCD panel with described black shows signal accordingly.
11. as arbitrary described liquid crystal indicator in the claim 1 to 10, it is characterized in that,
The electronic program guide information multiplexing according to broadcast data detects the type classification of answering display image.
12., it is characterized in that the content information according to obtaining from foreign medium detects the type classification of answering display image as each described liquid crystal indicator in the claim 1 to 10.
13., it is characterized in that as each described liquid crystal indicator in the claim 1 to 10, select indication information according to the video source of user's input, detect the type classification of answering display image.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002355033 | 2002-12-06 | ||
| JP355034/2002 | 2002-12-06 | ||
| JP355033/2002 | 2002-12-06 | ||
| JP025636/2003 | 2003-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1711576A CN1711576A (en) | 2005-12-21 |
| CN100472597C true CN100472597C (en) | 2009-03-25 |
Family
ID=35707237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801032194A Expired - Fee Related CN100472597C (en) | 2002-12-06 | 2003-12-08 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100472597C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473394A (en) * | 2009-08-07 | 2012-05-23 | 夏普株式会社 | Liquid crystal display device |
| CN106023917A (en) * | 2012-02-20 | 2016-10-12 | 夏普株式会社 | Drive device and display device |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2905027B1 (en) * | 2006-08-21 | 2013-12-20 | Lg Philips Lcd Co Ltd | LIQUID CRYSTAL DISPLAY DEVICE AND ITS CONTROL METHOD |
| JP2008268887A (en) * | 2007-03-29 | 2008-11-06 | Nec Lcd Technologies Ltd | Image display system |
| US20110267383A1 (en) * | 2009-05-19 | 2011-11-03 | Sharp Kabushiki Kaisha | Liquid crystal display device and driving method thereof |
| US9653026B2 (en) * | 2012-03-07 | 2017-05-16 | Canon Kabushiki Kaisha | Backlight controlling apparatus, backlight controlling method and program |
| CN102788294A (en) * | 2012-06-04 | 2012-11-21 | 苏州佳世达电通有限公司 | Display device, backlight device and backlight source control method |
| US11222606B2 (en) | 2017-12-19 | 2022-01-11 | Sony Group Corporation | Signal processing apparatus, signal processing method, and display apparatus |
| KR102485164B1 (en) * | 2018-05-03 | 2023-01-09 | 삼성디스플레이 주식회사 | Driving voltage setting device, method of setting driving voltage for display device, and display device |
| CN109212832B (en) * | 2018-10-30 | 2023-12-12 | 京东方科技集团股份有限公司 | Liquid crystal display panel, manufacturing method thereof and liquid crystal display device |
-
2003
- 2003-12-08 CN CNB2003801032194A patent/CN100472597C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102473394A (en) * | 2009-08-07 | 2012-05-23 | 夏普株式会社 | Liquid crystal display device |
| CN102473394B (en) * | 2009-08-07 | 2014-06-25 | 夏普株式会社 | Liquid crystal display device |
| CN106023917A (en) * | 2012-02-20 | 2016-10-12 | 夏普株式会社 | Drive device and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1711576A (en) | 2005-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100687680B1 (en) | Liquid crystal display device | |
| CN101268502B (en) | Liquid crystal display | |
| KR100503579B1 (en) | Display device | |
| CN1217308C (en) | Image display and displaying method | |
| KR100571070B1 (en) | Display device | |
| US8836770B2 (en) | 3D display | |
| CA2327429C (en) | Conversion of a video signal for driving a liquid crystal display | |
| JP4621795B1 (en) | Stereoscopic video display device and stereoscopic video display method | |
| WO2007072598A1 (en) | Display device, receiver, and method of driving display device | |
| CN100570694C (en) | Display device and method | |
| US20100289883A1 (en) | Stereocopic visualisation | |
| US20090122087A1 (en) | Display device | |
| US9928789B2 (en) | Display having fixed frame-rate up conversion followed by variable frame-rate down conversion, wherein frame decimation is carried out according to frame ID number | |
| JP4740888B2 (en) | Liquid crystal display | |
| JP4167474B2 (en) | Liquid crystal display | |
| KR20080000632A (en) | Scanning backlight lcd panel with optimized lamp segmentation and timing | |
| JP2009134237A (en) | Display device | |
| CN109493787B (en) | Method for adjusting dynamic fuzzy effect and display system | |
| CN109192150A (en) | Backlight module driving method and driving structure, display device | |
| CN100472597C (en) | Liquid crystal display device | |
| CN101437128A (en) | Display apparatus and method | |
| CN103971653B (en) | Display device and display control method | |
| JP4192140B2 (en) | Liquid crystal display | |
| TW200411701A (en) | Method for driving plasma display panel, and plasma display device | |
| JP4619095B2 (en) | Liquid crystal display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090325 Termination date: 20181208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |