JPH0451285A - Color plasma display - Google Patents

Abstract

PURPOSE:To obtain the balance of the light emitting brightnesses of respective colors and to obtain prescribed color mixed emissions by setting the time when a voltage is impressed between a 1st electrode and 2nd electrode for one time of light emission of a light emitting cell, i.e. one time of discharge time of one piece of the light emitting cell by each color of the light emitting cells by a driving time setting means. CONSTITUTION:This display is equipped with 3n pieces of the anode electrode A1, A2,..., A3n and 3m pieces of cathode electrodes C1, C2,..., C3m extending in the direction intersecting with the anode electrode A1, A2,..., A3n and is formed with the light emitting cells in the vicinity of the intersected points of both electrodes. A light emission enable signal SE1 is inputted to buffers 16 for driving the anode electrodes A1, A4,..., A3n-2 in these buffers and the time when the on voltage is impressed to the anode electrodes A1, A4,..., A3n-2 is regulated by the on time of the signal SE1. The on time of the light emission enable signals SE1, SE2, SE3 is so selected by the length within the time of the light emission period T so as to be t1r for the R light emission and to be t1b for the B light emission. Three kinds of the on time t1r, t1g, t1y are set at the ratios of the time when the balance of the brightnesses YR, YG, YB of the light emitting cells of respective colors is obtd. when this time is impressed and the expected emission colors are obtainable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color plasma display that displays colors by mixing light-emitting cells of three primary colors: red, green, and blue.

[Conventional technology]

In a color plasma display, one substrate on which a plurality of cathode electrodes are arranged in parallel and the other substrate on which a plurality of anode electrodes are arranged in parallel are arranged so that the electrode forming surfaces face each other and the picture electrodes are arranged in a predetermined manner. They are formed by pasting them together so that they intersect at intervals. A discharge gas is sealed between the two substrates, and an image is displayed by discharge light emission when a voltage is applied between the anode electrode and the cathode electrode by a drive circuit.

FIG. 2 is a circuit diagram showing the configuration of a conventional color plasma display, and FIG. 3 is a time chart for explaining the operation of this plasma display.

As shown in FIG. 2, the conventional plasma display has n anode electrodes A1. A2. ...A and this anode electrode A1. A2,'...,A.

m cathode electrodes C1°C2 extending in a direction intersecting with
, . . . , C
, green (G), and blue (B), and a color display is performed by mixing these three colors. Moreover, the anode electrode A1. A2,・
..., Ao are connected to the anode driver via the protective resistor r, and the cathode electrodes C1, C2, ..., CI! ! 8
Connected to pole driver 2.

Then, the anode clock signal φ1 is sent to the shift register 3.
n pieces of data A-DATA input in synchronization with are stored, and this data A-DATA is sent to the latch circuit 4, and from this latch circuit 4, n pieces of data are stored at regular intervals T by a latch signal S. A-DATA is sent out to the anode driver 1 in parallel. At this time, the anode driver 1 applies a driving voltage to the anode electrodes Ai, A2, .

On the other hand, the counter decoder 5 receives the cathode clock signal φ2.
When m C-DATA are inputted in synchronization with , a selection signal is inputted to the cathode driver 2, and the cathode selection signal indicating the on state is sequentially sent from the cathode driver 2 to the cathode electrodes C1, C2, . . . CI. Output.

[Problem to be solved by the invention]

However, in the conventional color plasma display described above, there is a problem in that the apparent color of the emitted light obtained by mixing the three primary colors of R, G, and B light deviates from the expected color.

This is because, depending on the chromaticity coordinates of a single color (R, G, and B colors), the apparent color of emitted light deviates from white even if R, G, and B are mixed with the same brightness.

That is, this is shown by the following equation based on the CIE1931 XYZfi color system. First, R,G.

Chromaticity coordinates when B light is mixed (xR68°YRG
B) and luminance YRG8 are the chromaticity coordinates and luminance of each color of R, G, and B, respectively, R(xR, yR, YR) and cr(xG,
It is known that when yG, YG) and B(xB, yB, YB-) are expressed as follows.

xRG8=(XRYRyGyB+XGYGyRyB+x
BYB yFI yG ) / (yB yG YR+
yRyBYG+yRyGYB) V RGB = 3/ R3/ a yB(Y R+ Y
a + Y B)/ (3'B 'JG YR+ 3
'RyB Ya+ 3'R'1GYB ) YRGB = YR + Ya + Ya In this way, the chromaticity of the mixed luminescent color N#A<x
, y) are the chromaticity coordinates RGB of each color of R, G, and B.
RGB marks (XR, yR), (XG, yG), (xB.

y) and the brightness YR, Ya, Ya of each color, the chromaticity coordinates of a single color (XR, yR), (X(3, yG
), (xa, 3'B), RlG, B
Even if the colors were mixed at the same brightness, white color could not be obtained.

Therefore, the chromaticity coordinates (XR, yH), (xG, y
G), the luminance YR of each color according to (xa, 3'B)
, Y(3, Ys). In order to correct this color shift, the structure of the light emitting cell of each color, e.g.
The brightness YR and Ya of each color can be adjusted by changing the thickness of the phosphor and color filter.

Although it is possible to correct the balance of Y, it has been difficult to finely adjust the color balance by changing the structure.

Therefore, the present invention has been made to solve the problems of the prior art as described above, and its purpose is to:
To provide a color plasma display capable of easily adjusting color tone and displaying high-quality color.

[Means to solve the problem]

The color plasma display according to the present invention includes: a plurality of first electrodes; a plurality of second electrodes extending in a direction crossing the first electrodes and facing the first electrodes at a predetermined distance; A plurality of red light emitting cells are formed near the intersection of the first electrode and the second electrode and emit red light, and a plurality of red light emitting cells are formed near the intersection of the first electrode and the second electrode and emit green light. A voltage is applied between a green light emitting cell, a plurality of blue light emitting cells that are formed near the intersection of the first electrode and the second electrode and emit blue light, and the first electrode and the second electrode. and a driving means for causing discharge in the light-emitting cells of each color, and in a color plasma display that displays color by a combination of light emitted from the light-emitting cells of each color, for one discharge in the light-emitting cells. The present invention is characterized in that it includes drive time setting means for setting the time during which a voltage is applied between the first electrode and the second electrode for each color of the light emitting cell.

[For production]

In the present invention, the time period during which a voltage is applied between the first electrode and the second electrode for one light emission of the light emitting cell, that is, 1
The discharge time of each light emitting cell is set for each color of the light emitting cell by a drive time setting means, and the luminance of each color of red, blue, and green is balanced to obtain optimal mixed color light emission.

〔Example〕

The present invention will be explained below based on illustrated embodiments.

FIG. 1 is a circuit diagram showing an embodiment of a color plasma display according to the present invention, and FIG. 4 is a time chart for explaining the operation of this embodiment.

As shown in FIG. 1, this plasma display includes 3n anode electrodes A1. A2. ...A3n and
3m cathode electrodes C1, C2 extending in a direction intersecting the anode electrodes Ai, A2, ..., A3°
, .
Fluorescent materials or color filters that emit light of R), green (G), and blue (B) are provided in order, and the adjacent R, G, and 8
Color display is performed by mixing three colors of light.

In addition, anode electrodes Ai, A2,...''3n
are connected to the anode driver 1 via the protective resistor r, and the cathode electrodes Ci, C2, . . . , C3, are connected to the cathode driver 2.

Furthermore, the plasma display of this embodiment includes a shift register 3 that stores 3n pieces of data A-DATA that are input in synchronization with the anode clock signal φ1;
The shift register 3 includes a latch circuit 14 which outputs the received 3n data A-DATA in parallel to TfG for a certain period of time using a latch signal S, and a time period during which voltage is applied to the anode electrode for the red light emitting cell. , 3n three-state buffers 16, which are set to t for green light emitting cells and tIb for blue light emitting cells. In this buffer 16, the anode electrode A
1. A4. ...” The light emission enable signal SE1 is input to the 3n-2 driving device, and the anode electrodes A2, A5
．． ..." The light emission enable signal SE2 is input to the 3n-1 drive device, and the anode electrodes A3, A6...
, A3o is driven by a light emission enable signal SE3. Then, the three-state buffer 16
The time during which the on-voltage is applied to the anode electrodes A1°A, . Similarly, depending on the on time of the light emission enable signal SE2, the anode electrode A
The time during which the on-voltage is applied to 2, As,...A3n-1 is defined, and the anode electrodes A, A,..., A3 are determined by the on-time of the light emission enable signals S and 3.
The time period during which the on-voltage is applied to o is defined.

Here, the light emission enable signal SE1. S, 2. As shown in Fig. 4, Se2 has an ON time of t for R emission, 1+g for G emission, and tlb for B emission 1'' within the emission period T time. In addition, these three types of on-time tIr
' tlg and tlb are set to the ratio of time at which the luminances YR, Ya, and Ya of the light-emitting cells of each color are balanced and the expected luminescent color is obtained when these are applied.

For example, when each light emission color is set to full light mode, the emission color when mixed colors is the white standard color (chromaticity coordinates of the white standard color of D65)
X, 4. 'f, 4) is (0,3127,0°3290
>), if it deviates to the light blue side, the R light emission brightness YR is insufficient, so the ON time is 1. is maximized, and the on-times t1g and t1b are adjusted to lower the emission brightness Ya and Ya, and the mixed emission color is expressed in chromaticity coordinates as (x, y)RGB RGB = (0,3127,0, The balance of brightness YR, Ya, and Ya is adjusted so that the brightness becomes 3290).

Furthermore, this embodiment is provided with a counter decoder 15 to which 3m C-DATA are input in synchronization with the cathode clock signal φ2, and a selection signal is input from the counter decoder 15 to the cathode driver 12.
A cathode selection signal is output which sequentially turns on the voltage to the cathode electrodes C1''2', . . . , C311.

In this embodiment, since the pixels are arranged in the order of RlG and B in both the row and column directions as shown by R, G, and B in FIG. 1, the light emission enable signal SEl'
As shown in FIG.
t1. > t, g> t +b) is used as a pulse signal that repeats in sequence, and is a signal that is shifted by one period T. Then, when the cathode driver 12 outputs a cathode selection signal that sequentially turns on the voltage to the cathode electrodes C1, C2, . For the cell, the on time is 1+, and for the 8 light emitting cells, the on time is tl.
The length is selected within the light emitting period T time so that the light emitting period T is equal to b.

As explained above, by the combination of the output of the anode driver 11 and the output of the cathode driver 12, the three types of on-times tlr''Ig'tlb are determined by the brightness YR, Ya of the light-emitting cells of each color when this is applied.

Since the time ratio is set so that YB is balanced and the expected luminescent color is obtained, 3n×3m light emitting cells can be selectively driven with the expected luminescent color.

In the above embodiment, the pixel array of the color plasma display is arranged in the order of R, G, and B, and three types of light emission enable signals SE1. Although a case has been described in which a three-state buffer is provided for inputting S[2, SF3, the present invention is not limited to this. , other pixel arrangements and other light emission enable signals can be used as long as the luminance of each color can be balanced.

〔Effect of the invention〕

As described above, according to the present invention, by changing the light emitting time of the light emitting cells of each color of red, blue, and green, the luminance of each color is balanced and a predetermined mixed color light emission is obtained. Therefore, compared to the case where the luminescent color is corrected by the structure such as the type of phosphor or the thickness of the filter, the luminescent color can be easily and appropriately corrected, and high-quality color display can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of a color plasma display according to the present invention, Fig. 2 is a circuit diagram showing the configuration of a conventional color plasma display, and Fig. 3 explains the operation of the display shown in Fig. 2. FIG. 4 is a time chart for explaining the operation of the display of this embodiment. 11... Anode driver 12... Cathode driver 13... Shift register 14... Latch circuit 15... Counter decoder 16... Buffer At, A2,..., A3゜... Anode electrode C1, C2,..., C311... cathode electrode r.
...Protection resistance patent applicant Oki Electric Industry Co., Ltd. Agent Patent attorney 1) Practical effect Figure 2

Claims (1)

[Scope of Claims] A plurality of first electrodes; a plurality of second electrodes extending in a direction crossing the first electrodes and facing the first electrodes at a predetermined interval; A plurality of red light emitting cells are formed near the intersection of the electrode and the second electrode and emit red light, and a plurality of green light emitting cells are formed near the intersection of the first electrode and the second electrode and emit green light. A voltage is applied between the cell, a plurality of blue light-emitting cells that are formed near the intersection of the first electrode and the second electrode and emit blue light, and the first electrode and the second electrode. and a driving means for causing discharge in the light-emitting cells of each color, and a color plasma display that displays color by a combination of light emitted from the light-emitting cells of each color. A color plasma display comprising drive time setting means for setting a time period during which a voltage is applied between one electrode and the second electrode for each color of the light emitting cell.