JPH09191465A - Burning reduction method for color pdp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a burning phenomenon generated in a comparatively early period in a color plasma display panel(PDP). SOLUTION: A drawing shows the secular extinction characteristic of a fluorescent body emitting the prescribed color of color PDP. Here, a lateral axis (t) is light emitting time, a vertical axis L is light emitting luminance and a curve C is a secular extinction characteristic. Extinction quantity Lb-Lc from t=b to time t=c after T hours is smaller compared with extinction quantity La-Lb from the initial time t=a of light emitting time of time t=b after T hours. When the method is started to be used from time t=a, for example, the character of a personal picture is displayed, and the irregularity of light emitting luminance L between a part which is light-emitting and a part which is not light-emitting becomes La-Lb after T hours. When burning is executed by displaying white on the whole screen until time t=b, it becomes Lb-Lc after T hours and luminance irregularity can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color PDP burning reduction method for reducing unevenness in brightness of a color PDP used for displaying television images, personal computer images and the like due to burning.

[0002]

2. Description of the Related Art Since a PDP exhibits a relatively large dimming characteristic in the initial stage of use, when a still image is displayed on a personal computer or the like, a phosphor that is frequently used is darker than a phosphor that is not frequently used. Then, the image sticking phenomenon occurred relatively early.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the burn-in phenomenon that occurs relatively early in a color PDP.

[0004]

By burning the light emitting surface to uniformly emit light at the initial stage of light emission of the color PDP, the burning phenomenon that causes uneven brightness during use of the color PDP is reduced.

Burning is white burning in which R, G, and B are simultaneously emitted to display white.

Burning is color burning in which each color is caused to emit light for burning.

[0007] Color burning is performed by changing the burning time for each color according to the emission luminance reduction characteristics of the phosphors for each color.

Burning is color burning in which the emission intensity of each color is changed according to the emission characteristics of the phosphor for each color with respect to the emission time.

[0009] The phosphor emits less light emission luminance with respect to the light emission time than the white light emission.

The emission of the phosphor whose emission luminance is greatly reduced with respect to the emission time is emitted more strongly than during white emission, and the emission of the phosphor whose emission luminance is less reduced with respect to emission time is emitted less than during white emission. The total power consumption is set to the power consumption when emitting white light.

Burning is performed with power consumption exceeding the power consumption when the PDP is used.

[0012]

The emission luminance reduction characteristic of the phosphor of the color PDP with respect to the emission time, that is, the temporal extinction characteristic, greatly diminishes per unit time at the initial stage of light emission, and gradually dims slowly. Therefore, by performing burning so that the light emitting surface emits light uniformly at the initial stage of light emission of the color PDP, the amount of dimming after that is reduced, so that the burn-in phenomenon that causes uneven brightness during use of the color PDP can be reduced.

The above-mentioned object can be easily achieved by burning by whitening in which R, G and B are simultaneously emitted to display white.

Burning is performed by color burning in which each color is caused to emit light for burning, so that burning can be performed in accordance with the time-dependent extinction characteristic of the phosphor for each color.

In the color burning, the burning for each color can be performed optimally by changing the burning time for each color according to the attenuating property of the phosphor for each color.

Burning is performed by performing color burning in which the emission intensity of each color is changed according to the emission characteristics of each color phosphor with respect to the emission time, so that optimum burning can be performed simultaneously for each color phosphor.

By making the light emission of the phosphor, which has a small reduction in light emission luminance with respect to the light emission time, weaker than that during white light emission, the overall power consumption during burning can be made smaller than during white light emission.

In the color PDP, the emission of the phosphor whose emission luminance is greatly reduced with respect to the emission time is emitted more strongly than that during white emission, and the emission of the phosphor whose emission luminance is less than emission time is emitted less than that during white emission. By setting the total power consumption to be the power consumption at the time of substantially white light emission, optimum burning for each color phosphor can be performed in a short time.

Burning can be performed in a short time by performing power consumption exceeding the power consumption when the PDP is used.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color PDP burning reduction method according to the present invention will be described in detail below with reference to the drawings. FIG.
This is the characteristic of reducing the emission luminance with respect to the emission time of the phosphor that emits a certain color of the color PDP, that is, the temporal dimming characteristic. Here, the horizontal axis t is the light emission time, the vertical axis L is the light emission luminance, and the curve C is the temporal dimming characteristic. Initial time point of light emission time t = a
From the time point t = b after T time to the time point t = b, the light reduction amount Lb-Lc from the time point t = b to the time point t = c after the T time is smaller. Therefore, for example, time t =
When the use is started from a, the unevenness of the light emission luminance L at the place where the characters and the like of the personal computer image are displayed and where the light is not emitted becomes La-Lb after T time, but the whole screen is displayed until the time point t = b. If whitening or the like is performed on the display, it becomes Lb-Lc after T time, which can be smaller than the uneven brightness.

FIG. 2 is a block diagram of an example of an apparatus for performing the above burning. The signal source 21 generates a video signal that causes the entire screen of the PDP to emit R, G, and B colors with arbitrary intensities. The video signal output from the signal source 21 is transmitted to the PDP 2
The PDP 25 can be burned by inputting it to the driving circuit 24 of No. 5 to cause the PDP 25 to emit light in the entire screen in an arbitrary color. The signal source 21 is a control unit 2 including a timer 23.
By 2, it is possible to control to output an arbitrary color signal with an arbitrary intensity. As a method of burning, color PDP
It can be easily achieved by performing white baking for approximately 250 hours for displaying white by simultaneously emitting the phosphors that emit the R, G, and B primary colors.

Since the materials of the R, G, and B primary color phosphors of the color PDP are different, generally, the time-dependent extinction characteristics are also different for each color. Therefore, as another method of burning, it is also possible to use color burning in which each color is caused to emit light to perform burning. In this case, for a phosphor with small temporal extinction, short-time burning and for a phosphor with large temporal extinction, long-term burning, the amount of temporal extinction per unit time after burning The primary colors can be almost the same.

As yet another method of burning, it is also possible to use color burning in which the light emission intensity is changed for each color. In this case, the amount of time-dependent extinction after burning can be made substantially the same as that of the phosphor with large temporal extinction by causing the phosphor with small extinction with time to emit light weakly. Alternatively, the emission of the fluorescent material with large temporal extinction is emitted more strongly than during white emission, and the emission of the fluorescent material with small extinction is emitted weaker than during white emission, so that the overall power consumption of the color PDP is approximately white emission. By performing the burning so that the power consumption becomes the same, it is possible to make the temporal dimming amount per unit time after burning approximately the same for each primary color. Furthermore, by performing forced cooling or the like on the PDP, it is possible to burn at a power consumption that exceeds the power consumption when the PDP is in use.

[0024]

As described above, the phosphors for each color are excited by the ultraviolet rays generated by the plasma discharge to generate R, G,
Color PDP that emits the three primary colors of B for color display
In the above, since the burning phenomenon that causes uneven brightness during use of the color PDP can be reduced by burning the light emitting surface to uniformly emit light at the initial stage of light emission of the color PDP, the display is beautiful and as a result. Can obtain a color PDP having a long life.

[Brief description of the drawings]

FIG. 1 shows emission luminance reduction characteristics with respect to emission time of a phosphor that emits a certain color of a color PDP, that is, time-dependent extinction characteristics.

FIG. 2 is a block diagram of an example of an apparatus for performing burning.

[Explanation of symbols]

 L Luminance Luminance t Luminescence Time C Temporal Dimming Characteristics La t = a Luminance Luminance Lb t = b Luminance Luminance Lc t = c Luminance Luminance T Time Interval 21 Signal Source 22 Control Unit 23 Timer 24 Drive Circuit 25 PDP

Claims (8)

[Claims] 1. R (red), G (green), B (blue) by exciting phosphors for each color with ultraviolet rays generated by plasma discharge
Color PDP that emits light from the three primary colors for color display
(Plasma display panel)
A burning reduction method for a color PDP, characterized in that the burning phenomenon that causes uneven brightness during use of the same color PDP is reduced by burning the light emitting surface of the same color PDP uniformly at the initial stage of light emission of the DP. 2. The color P according to claim 1, wherein the burning is white baking in which the R, G, and B are simultaneously emitted to display white.
How to reduce the burning of DP. 3. The burning according to claim 1, wherein the burning is color burning in which light is emitted for each color to perform burning.
A method for reducing the burning of the described color PDP. 4. The color burning is performed by changing the burning time for each color in accordance with the emission luminance reduction characteristic of the phosphor for each color with respect to the light emitting time. How to reduce the burning of color PDP. 5. The color PDP according to claim 1, wherein the burning is performed by changing the emission intensity of each color according to the reduction characteristic of the emission luminance with respect to the emission time of the phosphor for each color and performing the burning. Burn reduction method. 6. The method for reducing the seizure of a color PDP according to claim 5, wherein the phosphor emits less light emission luminance with respect to the light emission time than the white light emission. 7. The emission of a phosphor having a large reduction in emission luminance with respect to emission time is made to emit light more strongly than during white emission, and the emission of a phosphor having a small reduction in emission luminance with respect to emission time is made to emit light weaker than during white emission. 6. The method for reducing the seizure of a color PDP according to claim 5, wherein the total power consumption of the color PDP is set to the power consumption at the time of substantially white light emission. 8. The method for reducing the seizure of a color PDP according to claim 1, wherein the burning is performed with power consumption exceeding power consumption when the PDP is used.