JP2001236034A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of making the decay characteristics of RGB phosphors equal even when the optical characteristics (buildup time, decay time) of the RGB phosphors of a back light for an LCD (liquid crystal display) and of a PDP(plasma display panel) are different. SOLUTION: This display is provided with light sources having phosphors 12 which are excited or not excited and a light transmission element or a light reflection element 7 which is one- or two-dimensionally arranged and performs a display by controlling transmitted light or reflected light and is further provided with a means for excitation after element control 11 which discontinuously excites the phosphors 12 which have been excited continuously when the continuous excitation is completed. Alternatively, the device is provided with a means for excitation before element control 11 which discontinuously excites the phosphors 12 which are to be excited continuously before the continuous excitation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a display device,
Regarding the improvement of the optical characteristics (rise time, afterglow time) of the luminous body, in particular, the variation in the optical characteristics (rise time, afterglow time) of the luminous body emitting a plurality of wavelengths is suppressed, and such a luminous body is reduced. A liquid crystal display device (hereinafter, “LCD” (Li
abbreviated as "Quid Crystal Display". ) Or a plasma display using a light emitting element as a display element (hereinafter, “PDP” (Plasma Display)).
y Panel). ) And other means for improving moving image quality.

[0002]

2. Description of the Related Art Conventionally, it is assumed that the reason why the moving image display quality (moving image quality) of a liquid crystal display is poor is that the response speed of the TN type liquid crystal used is different, and FIG. Attempts to improve moving image quality using responsive pi-cell liquid crystal have been reported in the Liquid Crystal Society of Japan Vol. 3, No. 2, 199.
9p99-106, "LC for new video using Picel
D ".

According to the same paper, although the liquid crystal response speed was improved (in this cell, the turn-on time was improved to 1 ms and the turn-off time was reduced to 5 ms), the moving image quality was improved over the TN type liquid crystal. Responds sufficiently within one frame). Note that the CR shown schematically in FIG.
It is pointed out that the moving image quality of the LCD is inferior to the moving image quality of T, as shown in FIG.

In the same paper, the first cause is a change in the dielectric constant of the liquid crystal, while the second cause is shown in FIGS. 14 (a) and 14 (c).
It is pointed out that this is the difference between the light emission characteristics of CRT and LCD. That is, the light emission characteristic of the CRT is an impulse type (each pixel emits light only for a moment) as shown in FIG. 14A, while the light emission characteristic of the LCD is as shown in FIG. Because it is a hold type (each pixel emits light continuously)
It is pointed out that the “coverage” of the images of the front and rear fields due to the movement of the line of sight is the cause of the deterioration of the moving image quality in FIGS. 14B and 14D. The same article also points out that the backlight emission should be of an impulse type such as a CRT as a countermeasure.

[0005] As described above, as a method of improving the moving picture quality of a liquid crystal display, it is effective to make the light emission characteristics closer to an impulse type such as a CRT. Image quality in display ". According to the subjective evaluation results of the aperture ratio (the ratio of the light emission period to one field period of the hold type display) and the image quality shown in the same manuscript, as shown in FIG. 15, the aperture ratio is small in the moving image region where the viewing angle speed is large. It is shown that the subjective evaluation result becomes higher (i.e., the image quality is better) as the result.

As a method for making the light emission characteristics of this LCD an impulse type, an IDRC (International
Display Research Conference
nce) '97 p203-206, "Improvi
ng the Moving-Image Quali
In this method, a switching circuit 42 for a fluorescent tube shown in FIG. 16A is used, and the fluorescent tube 43 is connected to the TFT 43 as shown in FIG.
By flashing as shown in FIG. 16C, originally, FIG.
FIG. 16 shows an LCD showing a hold-type transmission characteristic as shown in FIG.
This is a method for obtaining an impulse type light emission characteristic as shown in FIG. In this paper, the OCB (Optica)
lly Compensated Bend-mod
e, pi-cell is also a type of this mode) It is described that the moving picture quality of the cell is further improved. The fluorescent tube 4
In FIG. 3, by applying the voltage of FIG.
The light emission characteristics of (a) are obtained.

[0007]

Therefore, an inverter circuit actually connected to a cold cathode tube for a liquid crystal panel is shown in FIG.
FIG. 18B shows the result of measuring the afterglow characteristics of each of the RGB colors of the cold cathode fluorescent lamp by applying the voltage shown in FIG.

As can be seen from FIG. 18B, in an actual cold-cathode tube, the optical characteristics (rising time,
Afterglow time) are different. For this reason, when turning on / off the inverter circuit voltage connected to the cold cathode fluorescent lamp for the backlight of the LCD to improve the light emitting characteristics of the LCD showing the transmission characteristics of the hold type and approach the impulse type, as shown in FIG. When the image is followed by eyes (eye tracking), the motion blur decreases, but color breaks appear at both ends of the moving image due to the difference in the timing of the RGB color components remaining in the time direction.

Therefore, it is important to equalize the optical characteristics (rise time, afterglow time) of each of the RGB phosphors.
A practical blue phosphor is (SrCaBa) ₅ (PO ₄ ) ₃
Cl: ^{Eu 2+} or ^{_{BaMg 2 Al 16 0 27: Eu}} 2+
And the afterglow time is 1 ms or less.
On the other hand, the green phosphor is about LaPO ₄ : Ce ³⁺ and Tb ³⁺ , and the red phosphor is about Y ₂ O ₃ : Eu ³⁺ , and the afterglow time is as long as 4 ms or more.

As a countermeasure, a new green or red phosphor having a short afterglow time may be newly developed. However, the phosphor has the same afterglow characteristics as the blue phosphor without decreasing the light emission efficiency of these phosphors. It is difficult at present to develop phosphors.
Therefore, it is considered impossible to equalize the optical characteristics (rise time, afterglow time) of the RGB phosphors at this stage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. Even if the RGB phosphors such as LCD backlights and PDPs have different optical characteristics (rise time, afterglow time), the afterglow characteristics can be improved. It is an object to provide a display device that can be equalized.

[0012]

SUMMARY OF THE INVENTION The present invention solves the problems associated with the differences in the optical characteristics (rise time, afterglow time) of the above-mentioned RGB phosphors by changing the period during which the phosphors are continuously excited. A discontinuous excitation period is provided to absorb differences in the optical characteristics of the RGB phosphors during the discontinuous excitation period. The present invention is applied to a first display device including a light emitting body and a panel, wherein light from the light emitting body is controlled and displayed by the panel in which light transmitting or light reflecting elements are arranged one-dimensionally or two-dimensionally. In such a case, by providing a period in which the luminous body is continuously excited and a period in which the luminous body is discontinuously excited, the difference in optical characteristics of the RGB phosphor is absorbed during the period of discontinuous excitation. is there. In addition, by using a means for turning on the voltage in an impulse form without providing a period for completely turning off the voltage to the light source such as a cold cathode tube, the plasma state of the cold cathode tube and the mercury vapor pressure are maintained, and the relighting current is reduced. Has the effect of suppressing In the case of the first display device, the means for adjusting the afterglow characteristics of the RGB phosphors is a means for continuously exciting the luminous body and then exciting the luminous body continuously.

This means is a display device in which non-light emitting elements such as a liquid crystal display are arranged one-dimensionally or two-dimensionally. A voltage applied to a light source such as a cold-cathode tube so that the light source is turned on for a certain period of time and then turned off. When there is a period during which the voltage is turned on and a period during which the voltage is turned off, the voltage is turned on in an impulse form for a certain period of time after the voltage is turned on and off.
This is a means for providing a period of time. Thereby, when the afterglow time of a plurality of wavelengths such as a phosphor is different, the afterglow characteristic of a short phosphor can be matched to the afterglow characteristic of a pseudo long phosphor, and the afterglow characteristic of each wavelength in a moving image display can be adjusted. Color breakage can be prevented.

In the case of the first display device, the means for matching the rising characteristics of the RGB phosphors is a means for discontinuously exciting the luminous body before continuously exciting the luminous body. This means is a display device in which non-light emitting elements such as a liquid crystal display are arranged one-dimensionally or two-dimensionally, and turns on a voltage applied to a light source such as a cold-cathode tube so that the light source is turned on for a certain period and then turned off. When a period and an OFF period are provided, this is a means for providing a period during which the voltage is turned ON in an impulse form for a certain period or more before entering the ON period from the voltage OFF period. Thus, when the rise time of a plurality of wavelengths such as a phosphor is different, the rise characteristic of a short phosphor can be matched to the rise characteristic of a pseudo long phosphor, and the rise characteristic of each wavelength in a moving image display can be adjusted. Color breakage can be prevented.

Further, the present invention provides a light source having a light-emitting body to be excited and non-excited, a light-transmitting element or a light-reflecting element arranged one-dimensionally or two-dimensionally to control transmitted light or reflected light for display. A display device comprising: an element control continuous excitation unit that continuously and discontinuously excites a continuously excited luminous body until it is continuously excited again.

This means does not provide a period for completely turning off the voltage to the light source such as a cold-cathode tube.
N means.

Further, according to the present invention, the light source comprises a plurality of light emitters, and the time from controlling the element to continuously exciting the light emitter corresponding to the element is substantially constant. A display device.

Thus, after scanning a pixel having a one-dimensional or two-dimensional light transmitting element or a reflective element such as a liquid crystal, the light source corresponding to the pixel can be turned on after waiting until the element responds to some extent. So, in addition to the above effects,
This has the effect of preventing display blur due to the response speed of the liquid crystal.

When the present invention is applied to a second display device for controlling and displaying a one-dimensionally or two-dimensionally arranged light-emitting body, a period in which the light-emitting body is continuously excited and a period in which the light-emitting body is discontinuously excited are controlled. By having such a period, the difference in the optical characteristics of the RGB phosphor is absorbed during the period of discontinuous excitation. Further, the voltage is completely applied to the light emitting element by the OF.
By using a means for turning on the voltage in an impulse manner without providing a period for F, the plasma state of the light emitting element such as a PDP or the mercury vapor pressure is maintained, and the relighting current is suppressed. In the case of the second display device, the means for adjusting the afterglow characteristics of the RGB phosphors is a means for exciting the luminous body continuously and then exciting the luminous body discontinuously. This means is a display device in which self-luminous display elements such as a plasma display are arranged one-dimensionally or two-dimensionally,
A period in which a voltage applied to the self-light-emitting element is turned on so that the self-light-emitting element constituting each pixel is turned on for a certain period and then turned off,
When a period for performing FF is provided, the period from when the voltage is ON to O
This is a means for providing a period during which the voltage is turned on in an impulse manner for a certain period or more after the period during which the FF is started. Thereby, when the afterglow time of a plurality of wavelengths such as a phosphor is different, the afterglow characteristic of a short phosphor can be matched to the afterglow characteristic of a pseudo long phosphor, and the afterglow characteristic of each wavelength in a moving image display can be adjusted. Color breakage can be prevented. In the case of the second display device, RGB
The means for matching the rising characteristics of the phosphor is a means for discontinuously exciting the luminous body before continuously exciting the luminous body. This means is a display device in which self-luminous elements such as a plasma display are arranged one-dimensionally or two-dimensionally, and is applied to the self-luminous elements so that the self-luminous elements constituting each pixel are turned on for a certain period and then turned off. Turn on the voltage
In the case where a period during which the voltage is turned on and a period during which the voltage is turned off are provided, a period during which the voltage is turned on in an impulse manner for a certain period or more before entering the period during which the voltage is turned off is provided. Thus, when the rise time of a plurality of wavelengths such as a phosphor is different, the afterglow characteristic of a short phosphor can be matched to the afterglow characteristic of a pseudo-long phosphor, and the wavelength between each wavelength in a moving image display can be adjusted. Color breakage can be prevented.

This means is a means applied to a self-luminous display element, particularly a plasma display using a phosphor. Thus, when the rise time of a plurality of wavelengths such as a phosphor is different, the rise characteristic of a short phosphor can be matched to the rise characteristic of a pseudo long phosphor, and the rise characteristic of each wavelength in a moving image display can be adjusted. Color breakage can be prevented.

The present invention relates to a display device for displaying a display by exciting and non-exciting a one-dimensionally or two-dimensionally arranged light-emitting body. It is a display device provided with a luminous body pre-excitation means for continuously exciting.

Thus, when the rise time of a plurality of wavelengths such as a phosphor is different, the rise characteristic of a short phosphor can be matched to the rise characteristic of a pseudo long phosphor, and each of the rise characteristics of a moving image display can be adjusted. Color breakage between wavelengths can be prevented.

Further, the present invention is a display device for displaying a display by exciting and non-exciting a one-dimensionally or two-dimensionally arranged light-emitting body, wherein the continuously excited light-emitting body is continuously and again excited. This is a display device provided with a luminous body control continual excitation unit that continuously and discontinuously excites the light.

This means does not provide a period for completely turning off the voltage to the light source such as a cold-cathode tube.
N means. This has the effect of maintaining the plasma state of the cold cathode tube and the mercury vapor pressure and suppressing the relighting current.

Further, the present invention is the display device, wherein the luminous body emits a plurality of wavelengths having different response characteristics.

As a result, each of the means of the present invention has a remarkable effect when a phosphor emitting a plurality of wavelengths having different response characteristics is used.

The present invention relates to a method for measuring the time from the end of continuous excitation of the luminous body to the start of discontinuous excitation, or the time from the end of discontinuous excitation of the luminous body to the start of continuous excitation. , Within 1/300 second.

Further, the present invention is the display device, wherein each excitation interval in the period in which the luminous body is discontinuously excited is within 1/300 second.

Further, when the light source is turned off after being turned off for a certain period, this is a means for providing a period for turning on the voltage in an impulse manner for a certain period or more before the period for turning on the voltage.

Each means of the present invention is particularly effective when light emitted from a light source such as a cold-cathode tube has different optical characteristics (rise time, afterglow time) at a plurality of wavelengths such as a blue-red line.

When the light emitted from the light source such as the cold-cathode tube has different optical characteristics (rise time, afterglow time) of a plurality of wavelengths such as blue, red and green, the rise time and the persistence time by each means of the present invention are different. The afterglow characteristics of the phosphor having a short light time can be pseudo-matched to the optical characteristics of the phosphor having a long rise time and a long afterglow time, and color breakup between wavelengths can be prevented.

In particular, the period from the time when the voltage of the light source is turned on to the time when the voltage is turned off until the voltage is turned on in the first impulse form is preferably within 3 ms or 1/300 s.

The period of the voltage ON period in the form of an impulse applied during the period when the voltage of the light source is OFF is 3 ms.
Or, it is preferably within 1/300 s.

As a result, the effect of each means of the present invention is more remarkable when the color breakup is within 1/300 second which cannot be detected by human eyes.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. The display device of the present invention will be described with reference to examples. The display device of the present embodiment is applied to a non-light-emitting display using a light-emitting body, in particular, a fluorescent light-emitting tube as a light source. Non-emissive displays are TFT liquid crystal displays, PA
LC (Plasma Addressed Liquid)
Crystal display, simple matrix type FLC (Ferroelectrics Liquid)
Crystal / AFLC (Anti-Ferro)
This is a non-self-luminous display such as an electric liquid crystal display. In this embodiment, a TFT liquid crystal panel whose configuration is schematically shown in FIG. 1 is used as a representative example. Since this TFT liquid crystal panel is already widely available as a component in the form of a module in the market, its manufacturing method is omitted here, but it can be purchased from various manufacturers such as Sharp Corporation.

Panel 7 Used in Display Device of Embodiment 1
Is a VGA (480 × 640) schematically shown in FIG.
Size TFT liquid crystal panel,
Gate driver 2, source electrode 3, gate electrode 4, TF
T5, a pixel electrode 6, and the like. In this embodiment, the driving waveform applied to each electrode of the TFT liquid crystal panel 7 is as shown in FIG. That is, as shown in FIGS. 2 (1) to (4), a gate ON voltage (+10 V) is sequentially applied from the gate driver 2 to one of the gate electrodes G1 to G480 in the display scan. Then, a gate OFF voltage (−10 V) is applied to the other gate electrodes, and electric charges are supplied from the source driver 1 to the pixel electrodes 6 through the TFTs 5 which are turned on by the gate ON voltage. In addition, a voltage between +5 and -5 V is applied to each pixel electrode 6 supplied from the source driver 1 during this period, as shown in FIGS. Is determined so that the liquid crystal on the pixel electrode is in a predetermined state (a value determined from image information). As shown in FIG. 2 (5), a voltage of +5 V or -5 V is alternately applied to the counter electrode every field period.

The TFT liquid crystal panel scanned in this manner is overlaid on a backlight system 12 whose structure is schematically shown in FIG. This backlight system 12 has 8
SW (switch) 8 for turning on / off the power of the inverters 9, the eight fluorescent tubes 10, and the eight inverters 9, S
It comprises a W control circuit 11. The SW control circuit 11
It receives a synchronization signal from a TFT controller (not shown) and controls its SW8. In this backlight system 12, one inverter and one fluorescent tube correspond one-to-one. In addition, the display device of the present embodiment has the excitation means after the element control, whereby the backlight (light emitter) becomes non-excited (extinguished) when the continuous excitation (lighting) ends. Until discontinuously excited. The SW control circuit 11 can be used as an example of the excitation means after the element control.

In the first embodiment, as shown in FIGS. 4 (1) to 4 (4), the timing of applying the power supply voltage to each inverter 9 of the backlight system 12 is the end of the gate scanning time in one field period. After applying a constant lighting voltage from time to time, a pulsed lighting voltage is applied. At that time, the blinking state of each fluorescent tube 10 of the backlight system 12 becomes a panel transmission period including a fluorescent tube lighting period ton and a fluorescent tube afterglow period after the scanning time in one field period as shown in FIG. .

As shown in FIG. 6A, the inverter circuit for supplying a high-frequency high-frequency voltage to the cold-cathode tube is
After applying a constant lighting voltage, a pulse-like lighting voltage is applied during the afterglow time, so that the R (450 n
m), G (550 nm), and B (650 nm) afterglow characteristics are as shown in FIG. 6B. The fluorescent tube used at this time is the same as the fluorescent tube of FIG. 18B in the prior art, but instead of the voltage shown in FIG. Inverter O
By applying the voltage shown in FIG. 6A with N time inserted,
Color breakup caused by tracking a moving image with eyes (eye tracking) was reduced.

This is based on IEICE Technical Report, IE75-95, P.
P. 9-16 (1975) In "Movie image quality and television signal system", Professor Miyahara said, "Human is 1/300
The difference in the light waveform within seconds cannot be perceived. " In the present embodiment, since the application period of the pulsed voltage applied during the afterglow time of the G phosphor is set to within 1/300 second, the B phosphor having a fast response speed has a persistence characteristic of several ms or more. It is presumed that it looks the same as what you do.

In the first embodiment, by applying a pulsed lighting voltage during the afterglow time, the afterglow characteristics of each of the RGB colors of the cold-cathode tube can be pseudo-aligned.

Similarly, in order to make the start-up characteristics uniform, the pulsed lighting voltage is applied before applying a constant lighting voltage to an inverter circuit for supplying a high-voltage high-frequency voltage to the cold-cathode tube. The rising characteristics of each of the RGB colors of the cathode tube can be pseudo-uniform.

Embodiment 2 will be described. In the first embodiment, FIG.
As described above, the period from display scanning of the pixel of the TFT panel corresponding to each of the cold cathode tubes CCF1 to CCFL8 to turning on of each of the cold cathode tubes is made up of Top Line and Bottom Lin.
Extremely different in e. It suffices that the liquid crystal of the TFT panel responds sufficiently during the period from this display scanning until the cold-cathode tube is turned on, but one field period is about 1/60 second.
Considering that the turn-off time of the pi-cell shown in the conventional example is 5 ms, the timing of FIG.
It cannot be expected that the liquid crystal responds sufficiently on the m Line side.

Therefore, instead of the voltage of FIG. 4, the power supply voltage shown in FIGS. 7A to 7D is applied to each inverter 9 of the backlight system 12 whose structure is schematically shown in FIG. As shown in FIG. 8, the backlight is sequentially turned on. And also in the display device of Example 2,
As in the first embodiment, the device has an excitation unit after device control,
When the backlight (light emitter) is continuously excited (lit), it is discontinuously excited until it is not excited (turned off).

According to this method, as shown in the timing chart of FIG.
Since the display panel scans the pixels of the TFT panel corresponding to Fl to F8 and turns them on after a certain period of time, Bottom Lin
Also on the e side, it is easy to secure the time for the liquid crystal to respond.

At this time, the power supply voltage applied to each inverter circuit for supplying the high-voltage high-frequency voltage applied to each cold-cathode tube is the same as that shown in FIG. The optical characteristics were the same as those in FIG. 6B, and relaxation of color breakup due to tracking of a moving image with eyes (eye tracking) was observed as in Example 1.

Embodiment 3 will be described. In the first embodiment,
As shown in FIG. 4, the backlight system 12 of FIG.
When the power supply voltage applied to each of the inverters 9 is switched from the ON period to the OFF period, the voltage is turned on in an impulse manner for a certain period, but is completely turned off after a certain period.

In the third embodiment, instead of the inverter voltage shown in FIG. 4, an ON voltage is always discontinuously applied during a period in which the OFF period shown in FIGS. The display device according to the present embodiment includes the element control continuous excitation unit, so that the backlight (light emitting body)
It is continuously discontinuously excited until it is continuously excited (lighted) again. As an example of the element control continuous excitation means, SW
A control circuit can be used.

As described above, the period during which the voltage applied to the cold cathode tube is completely turned off (each excitation interval in the period of discontinuous excitation) is reduced to 1/300 second (several ms, especially 3 ms). In addition, there is an effect that the plasma state and the mercury vapor pressure of the cold cathode tube are maintained during the OFF period, and the relighting current is suppressed.

Further, the rising characteristics of the RGB colors of the cold-cathode tube are arranged in a pseudo manner, and there is also an effect of mitigating color breakup caused by following a moving image with eyes (eye tracking) as compared with the first embodiment. FIGS. 10A and 10B show the timing of indicating the inverter input characteristics of the fluorescent tube and the optical characteristics of the fluorescent tube RGB three-color phosphor in the third embodiment.

It should be noted that, instead of the element control continuous excitation means for continuously and discontinuously applying the ON voltage during the period in which the element is to be turned off, it is possible to have an excitation means before the element control. The (luminous body) is discontinuously excited before the start of continuous excitation (lighting), for example, for a certain period. An SW control circuit can be used as an example of the excitation means before the element control. An effect similar to that of the element control continuous excitation means can be obtained. When the interval between successive excitations is long, discontinuous excitation in an unnecessary period can be omitted.

Embodiment 4 will be described. Examples 1 to 3 are examples applied to a light source for a non-self-luminous display.
Embodiment 4 is an example of application to a self-luminous display, particularly to a PDP using a phosphor.

The display device of this embodiment, the AC type PDP1,
FIG. 11 shows a cross-sectional view of 10. That is, a pair of the X sustain electrodes 2 is provided on the lower surface of the surface glass substrate 21 on the display surface side.
2. The Y sustain electrode 23 is formed by the transparent electrode and the auxiliary electrode. In the auxiliary electrode, a bus electrode 33 is formed on a part of the transparent electrode in order to prevent a voltage drop due to the resistance of the transparent electrode. A dielectric layer 24 is provided on the X-sustain electrode 22 and the Y-sustain electrode 23 (on which a stripe-shaped rib 28 is formed to separate coupling between cells). Further, a protective layer 25 made of an MgO film is deposited. An address electrode 27 is formed on the opposing back glass substrate 26. Striped ribs 28 are provided between the address electrodes 27, and the R phosphor 29, the G phosphor 30, and the B phosphor 31 are separately formed so as to cover the address electrodes 27. A Ne + Xe mixed gas is sealed in the discharge space 32.

FIGS. 12A and 12B show a 256 gradation drive sequence and drive waveforms in this embodiment. FIG.
In (a), one frame has a relative luminance ratio of 1,
It consists of eight subfields of 2, 4, 8, 16, 32, 64, and 128, and 25 combinations of luminance of eight screens
Display of 6 gradations is performed. In FIG. 12B, each subfield includes an address period in which data for one refreshed screen is written and a sustain period for determining a luminance level of the subfield. In the address period, first, wall charges are initially formed on each pixel at the same time for the entire screen, and then a sustain pulse is applied to the entire screen to perform display. The brightness of the subfield is proportional to the number of sustain pulses and is set to a predetermined brightness. In this way, 256 gradation display is realized.

As described above, in the PDP, the Ne + Xe mixed gas in the discharge space of each pixel is excited by a sustain pulse to generate ultraviolet rays, and the ultraviolet rays cause the phosphor of each pixel to emit light. Same as fluorescent tube. Therefore, the occurrence of color breakup due to the difference in the optical characteristics (rise time, afterglow time) of each phosphor is the same as in a non-emission type display in which a cold cathode tube as a light source is blinked.

Therefore, in the fourth embodiment, a period for periodically applying a sustain pulse is added after the last 128 display fields of one frame period. That is, the display device of the present embodiment has the excitation means after the illuminant control, whereby the illuminant is discontinuous until the non-excitation (extinguishment) is performed at the end of the continuous excitation (lighting). Excited. The display device according to the present embodiment uses the RG
Color breakage of each color B was alleviated.

The self-luminous display also employs the luminous body control continuous excitation means or the luminous body pre-excitation means as in the second or third embodiment, similarly to the element control continuous excitation means or the pre-element control excitation means. And a similar effect can be obtained.

[0058]

According to the present invention, even if the optical characteristics (rise time, afterglow time) of RGB phosphors such as LCD backlights and PDPs are different, the afterglow characteristics can be equalized. A device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a TFT liquid crystal panel used in Examples 1 to 3.

FIG. 2 is an explanatory diagram of driving waveforms of a TFT liquid crystal panel used in Examples 1 to 3.

FIG. 3 is a schematic explanatory view of a backlight system used in Examples 1 to 3.

FIG. 4 is an explanatory diagram of a timing of an input voltage of the inverter according to the first embodiment.

FIG. 5 is an explanatory diagram of a TFT liquid crystal panel scanning timing and a backlight lighting timing in the first embodiment.

FIG. 6 is an explanatory diagram of timing of inverter input characteristics and an explanatory diagram of optical characteristics of a phosphor in Examples 1 and 2.

FIG. 7 is an explanatory diagram of a timing of an input voltage of an inverter in the second embodiment.

FIG. 8 is an explanatory diagram of a TFT liquid crystal panel scanning timing and a backlight lighting timing in the second embodiment.

FIG. 9 is an explanatory diagram of a timing of an input voltage of an inverter in the third embodiment.

FIG. 10 is an explanatory diagram of an inverter input characteristic timing of a fluorescent tube and an optical characteristic explanatory diagram of a phosphor in a third embodiment.

FIG. 11 is an explanatory diagram showing a configuration of a PDP used in a fourth embodiment.

FIG. 12 is an explanatory timing chart showing a driving method of the PDP used in the fourth embodiment.

FIG. 13 is an explanatory diagram of a liquid crystal molecule model of a conventional example.

14A and 14B are diagrams illustrating light emission characteristics of a conventional CRT and an LCD and a difference between images.

FIG. 15 is a graph illustrating the effect of making the light emission characteristics of a conventional LCD an impulse type.

FIG. 16 is an explanatory diagram of a configuration of a method of making a light emission characteristic of a conventional LCD an impulse type, and a timing explanatory diagram of a liquid crystal characteristic, a backlight characteristic, and a display characteristic.

FIG. 17 is a timing chart for explaining the light emission characteristics of a conventional fluorescent tube and the inverter output characteristics of the fluorescent tube.

FIG. 18 is an explanatory diagram of an inverter input characteristic timing of a fluorescent tube and an optical characteristic explanatory diagram of an RGB three-color phosphor.

FIG. 19 is an explanatory diagram of the effect of the optical characteristics of the three-color phosphor on moving image quality.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Source driver 2 Gate driver 3 Source electrode 4 Gate electrode 5 FET 6 Pixel electrode 7 TFT panel 8 SW between inverter and power supply 9 Inverter circuit 10 Fluorescent tube 11 SW control circuit 12 Backlight unit 21 Surface glass substrate 22 X sustain electrode Reference Signs List 23 Y sustain electrode 24 Dielectric layer 25 Protective layer 26 Back glass substrate 27 Address electrode 28 Striped rib 29 R (red) phosphor 30 G (green) phosphor 31 B (blue) phosphor 32 Discharge space 33 Bus electrode 41 PC 42 Switching circuit for fluorescent tube 43 Fluorescent tube 44 LCD module 45 PDP (plasma display panel)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G09F 9/30 349 G09G 3/34 J 5C094 G09G 3/28 3/36 5G435 3/34 H04N 5/66 102B 3/36 G02F 1/1335 530 H04N 5/66 102 G09G 3/28 HK F term (reference) 2H091 FA41Z FD06 FD22 FD23 GA13 LA15 2H093 NC34 NC42 5C006 AA01 AA22 AF44 BB11 EA01 FA25 FA29 5C058 AA11 BAA03BA03 BA03 BA03 AA10 BB05 CC03 DD01 EE19 EE25 EE29 EE30 FF09 GG02 GG08 HH02 HH04 JJ01 JJ04 JJ05 JJ06 5C094 AA03 BA31 BA43 CA19 5G435 AA01 BB03 CC12 DD09 HH06

Claims (10)

[Claims] 1. A display device comprising a luminous body and a panel, wherein light from the luminous body is controlled and displayed by the panel in which light transmitting or light reflecting elements are arranged in one or two dimensions. A display device having a period in which the light emitter is continuously excited and a period in which the light emitter is discontinuously excited. 2. The display device according to claim 1, wherein the luminous body is excited discontinuously after the luminous body is continuously excited. 3. The display device according to claim 1, wherein the luminous body is discontinuously excited before the luminous body is continuously excited. 4. The display device according to claim 1, wherein the light source comprises a plurality of luminous bodies, and the luminous bodies corresponding to the elements are continuously connected after controlling the elements. A display device characterized in that the time until the specific excitation is substantially constant. 5. A display device for controlling and displaying a one-dimensionally or two-dimensionally arranged light-emitting body, wherein the display apparatus has a period for continuously exciting the light-emitting body and a period for discontinuously exciting the light-emitting body. Characteristic display device. 6. The display device according to claim 5, wherein the luminous body is excited discontinuously after the luminous body is continuously excited. 7. The display device according to claim 5, wherein the luminous body is discontinuously excited before the luminous body is continuously excited. 8. The display device according to claim 1, wherein the illuminant emits a plurality of wavelengths having different response characteristics. 9. The display device according to claim 1, wherein the time from the end of the continuous excitation of the luminous body to the start of the discontinuous excitation, or the discontinuous state of the luminous body. A display device wherein the time from the end of excitation to the start of continuous excitation is within 1/300 second. 10. The display device according to claim 1, wherein each excitation interval in a period in which the luminous body is discontinuously excited is within 1/300 second. Display device.