JPH0561437A - Method and device for chromaticity modulation of color plasma display - Google Patents

Abstract

PURPOSE:To adjust the brightness and chromaticity in the case of color mixture of each discharge cell in a color plasma display with comparatively simple means. CONSTITUTION:The number of times of discharge maintaining pulses to be applied is set variably at every discharge cell group emitting in the same luminous color in each picture element P in a panel 5. Therefore, a maintaining pulse application circuit (for example, horizontal electrode drivers 41, 42) separated at every discharge cell group emitting in the same luminous color is provided, and the number of times of discharge maintaining pulses can be controlled variably at every separated maintaining pulse application circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color plasma display device in which one pixel is composed of a plurality of discharge cells which emit different emission colors unique to each cell, and a large number of such pixels are arranged in a matrix. Display device

[0002]

2. Description of the Related Art Generally, in a display device capable of displaying a plurality of colors, display pixels are composed of unit pixels (cells) having primary colors of red (R), green (G) and blue (B). ing. By combining these three primary colors, it is possible to display eight colors, and by changing the combination ratio, it is possible to produce nearly infinite colors.

Similarly, in a color plasma display (for example, an AC type color plasma display), one pixel is formed by a plurality of discharge cells each emitting a primary color. Then, a phosphor having a specific emission color is arranged in the discharge cell, the discharge excites the gas in the discharge space to generate ultraviolet rays, and the ultraviolet rays excite the phosphor to make the visible light peculiar to the phosphor. Light is generated. Commonly used phosphors are red, green, blue,
It emits visible light such as white. By combining these colors, colors such as yellow and purple, or by mixing them at an appropriate ratio, gradation display called multi-color or full-color display becomes possible.

Here, the following items can be cited as factors that determine the chromaticity of the emission color due to color mixing (a numerical expression of the color of light from an external object). First, the chromaticity of the emission color of the phosphor for each unit cell (discharge cell), the brightness of each unit cell,
Then, there are color crosstalk (color mixture caused by ultraviolet rays from the cells to be made to emit light by exciting the phosphors of the cells which are not made to emit light to cause them to emit light), which are caused by structural problems of the discharge cells.

From the viewpoint of suppressing variations in chromaticity of each panel, the following items can be said. That is, since the chromaticity of the unit cell is purely a problem of the phosphor, even if the panel is mass-produced, the same chromaticity can be reproduced by using the same phosphor. Next, the brightness of the unit cell depends largely on the process accuracy when forming the discharge cell or when printing the phosphor, depending on how much light from the phosphor is emitted to the outside. Although the problem of color crosstalk cannot be prevented to some extent, it depends on the process accuracy as in the former, depending on how the cell partition (barrier) structure is made uniform.

FIG. 12 shows an AC type plasma as prior art.
Panel 5 exemplifies the base structure of the display.
Discharge cells C are arranged in a matrix in the
Vertical electrodes X for generating a discharge in the discharge cell C₁Through
X_mAnd lateral electrode Y₁To Y _mThe vertical electrode
From the driver IC3 and the lateral electrode driver IC4,
A high voltage output having a drive waveform as shown in FIG.
Force is applied. In addition, 1 is each of the driver ICs 3 and 4
To the driver ICs 3 and 4
A control circuit for the control circuit 2,
Vertical sync signal and display data (which discharge cell per line
Data, such as whether to display
Face signal is input, and externally input in this way
Which discharge cells are selectively illuminated by aligning the collected data
Data of when to output to which line electrode
The control such as is done.

FIG. 13 exemplifies each drive waveform in the apparatus of FIG. 12 in a timing chart, and shows the drive waveform in one drive cycle (one horizontal synchronization period). Then, FIG. 13A shows a drive waveform for one drive cycle in the vertical electrode waveform applied from the vertical electrode driver 3 to a certain vertical electrode ( _Xn ), and FIG. The horizontal electrode driver 4 means a certain horizontal electrode (in this case, the line in which the display data is rewritten for the discharge cell (in this case, the display data is sequentially rewritten for each line), and this means Y _n Drive waveforms for one drive cycle (drive cycle in which display data is rewritten for the line) in the waveform of the horizontal electrode applied to (1).

As shown in FIG. 13, the drive waveform is divided into an address period and a sustain discharge period. In the address period, the discharge of the corresponding row (line) is performed by the write voltage applied by the vertical electrodes and the horizontal electrodes. Writing corresponding to the display data is performed on the cell (in other words, whether or not writing is performed on each discharge cell on the corresponding line is determined according to the display data).

That is, in the drive cycle in which the display data for the line is rewritten, first, in the previous frame, the narrow erase pulse EP shown in the horizontal electrode waveform Y _n (FIG. 13B) of the line is used. Erase discharge for forcibly ending the sustain discharge (that is, all the discharge cells of the line that have emitted light in the previous frame are once extinguished), and then the write pulse WP is applied to the line (MP will be described later). Sustain pulse).
Then, at this time, a certain vertical electrode waveform X _n (FIG. 13 (A))
To the write cancel pulse WC corresponding to the display data
Is not being output (that is, WC is off) or is being output (that is, WC is on),
It is determined whether writing is performed (that is, discharge light emission is performed) or writing is not performed (that is, erased) in the discharge cell C located at the intersection of the line (horizontal electrode) Y _n and the vertical electrode X _n. ..

The MP shown in the vertical electrode waveform X _n and the horizontal electrode waveform Y _n is a sustain pulse, and when writing is performed in the discharge cell C as described above, each electrode is the applied sustain pulse MP (in a driving cycle that rewriting is not made of the display data with respect to the line, the lateral electrode waveform Y _n of the line address period not merely only sustain pulse MP in a predetermined cycle is applied) Therefore, the discharge state is maintained (that is, data is rewritten in the address period in the next line (next frame)), or the erase pulse EP is forcibly applied during the process. As long as the discharge state is maintained). On the other hand, if the discharge cell C is not written as described above, the sustain discharge is not performed even if the sustain pulse MP is applied thereafter (that is, the data is rewritten in the address period in the next applicable line). Discharge does not occur unless is done). The vertical electrode waveform X _n has an address period for each drive cycle, and depending on whether or not the write cancel pulse WC is output at that time, each discharge cell in the line Y _n being rewritten at that time is , It is determined whether or not data is written.

FIG. 13C shows the cell voltage waveform (Y _n -X _n ) when the display data is written in the corresponding cell in the above driving cycle (that is, when the write cancel pulse WC is off). Figure 13 (C ') shows the cell voltage waveform when not writing display data to the corresponding cell (i.e. if the write cancel pulse WC is on) (Y _n -X _n).

That is, in the case of FIG. 13C, since the pulse WC is turned off, the write pulse WP is applied to the electrode of the discharge cell via the dielectric layer ( That is, charges (wall charges) are accumulated (on the surface of the dielectric layer) (that is, at the time T of FIG. 13C, the discharge start voltage is exceeded and a write discharge is generated in the cells to form wall charges). This causes the next sustain pulse MP
Is applied, the sustain voltage (the voltage of the sustain pulse) applied from the driver IC 3 or 4 and the potential due to the wall charges are added inside the cell, and the effective voltage exceeds the discharge start voltage ( That is, the write pulse WP
Then, a discharge occurs. Then, by applying the sustain pulse MP while inverting the polarity,
Discharge continues, light emission is repeated, and the total brightness becomes large. And this sustain discharge (discharge by sustain pulse)
As described above, whether or not the display data is rewritten in the address period in the corresponding line of the next time (next frame) as described above or the erase pulse EP is forcibly applied to the line in the middle of the process. limit,
Will be sustained.

On the other hand, in the case of FIG. 13 (C '), since the pulse WC is turned on, the pulse shown in FIG.
At time T of (C ′), the effective voltage of the cell is (WP−W
C) (shown as NWP in FIG. 13 (C ')) and the voltage required for writing is not reached, writing is not performed on the cell, and therefore even if the sustain pulse MP is applied thereafter, as described above. In addition, there is no sustain discharge due to the sustain pulse, and no discharge occurs in the cell unless display data is rewritten in the address period in the next line (next frame).

In FIG. 13, the sustain discharge in the previous frame is forcibly terminated once by the erase pulse EP in the address period of the drive cycle in which the display data is rewritten for each line, and then the current frame. Shows the drive waveform that writes the display data only to the necessary discharge cells in the relevant line and causes the discharge in the relevant cells, but instead, once in all the discharge cells in the relevant line in the address period, It is also possible to write the display data and then turn off the necessary discharge cells in the line within the same address period.

By the way, as described above, the chromaticity and the brightness at the time of color mixing between the display devices are as follows:
It largely depends on the process accuracy. Further, it is conceivable that these factors greatly vary with the increase in the screen size and the definition of the panel. Creating a display device with equivalent chromaticity and brightness is a major issue that requires not only quality but also the value of the device itself.

As an application of the display device, one device may be constructed by combining several small-sized panels. In that case, the difference in luminance and chromaticity of the panel is a big problem. However, the brightness of each primary color is adjusted by applying the technique of gradation display (one frame is divided into a plurality of subfields with different time ratios, and an arbitrary subfield is selected to control lighting). As a whole, it is possible to control the luminance and chromaticity during color mixing. However, since a complicated control circuit is required for gradation display,
This leads to an increase in cost and is difficult to apply to a device that displays about 3 to 8 colors.

Next, variations in luminance and chromaticity between panels will be described. Generally, a discharge cell of an AC type color plasma display is separated from an adjacent cell by a partition (barrier). The barriers are formed on either or both of the two glass substrates. Then, a phosphor is applied on the display surface side (inside the barrier), and is applied separately for each cell. The phosphor is often applied by printing. In this case, one type of phosphor is printed at a time, so that a panel having two primary colors is printed twice, and three primary colors are printed three times. Therefore, even if the printing of the phosphor for each time can be made uniform over the entire surface of the panel, the film thickness ratio between the phosphor printed for the first time and the phosphor for the second time can be made constant for each panel. Often difficult to do. The thickness of such a phosphor affects the brightness (brightness of a single color),
It causes variation in chromaticity when mixed colors.

However, in the current circuit configuration, the brightness cannot be changed for each cell of different emission colors unless the above-mentioned gradation display technique is applied. Therefore, as described above, the brightness of the primary colors over the entire panel is as follows. There is a problem in that there is no simple means for correcting the chromaticity at the time of color mixing, when the ratio of (2) varies among the individual panels.

[0019]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and makes it possible to adjust the luminance, and further the chromaticity at the time of color mixing, by means of a relatively simple means. It is intended to eliminate variations in luminance and chromaticity between panels without significantly improving the process accuracy of.

[0020]

As described above, in a plasma display, instantaneous discharge and light emission due to it occur repeatedly. Here, since the amount of light generated by one discharge is constant, the total brightness can be determined by how many discharges are generated per unit time (for example, one frame time).

The present invention utilizes such an operating principle. As the first aspect of the present invention, one pixel is composed of a plurality of discharge cells which emit different emission colors, and the pixels are arranged in a matrix. A sustaining pulse (discharge sustaining pulse) to be applied to each discharge cell group that emits the same emission color in each pixel (for example, to each discharge cell group that emits the same primary color) in each pixel. ), The chromaticity of the color due to the light emission of the plurality of discharge cells in each pixel can be changed over the entire screen.
A chromaticity modulation method for a plasma display is provided.

As a second aspect of the invention, there is provided a color plasma display in which one pixel is composed of a plurality of discharge cells which emit light of different emission colors, and a large number of the pixels are arranged in a matrix. Each pixel is provided with a sustain pulse (discharge sustaining pulse) application circuit that is separated for each discharge cell group that emits the same emission color (for example, for each discharge cell group that emits the same primary color), and the separate sustain pulse is provided. By controlling the number of sustain pulses for each pulse application circuit, the chromaticity of the color due to the light emission of the plurality of discharge cells in each pixel can be changed over the entire screen. A chromaticity modulator for a plasma display is provided.

[0023]

According to the above structure, the number of sustain pulses applied is controlled for each discharge cell group that emits the same emission color in each pixel, and as a device therefor, the same emission color is used. A sustain pulse applying circuit is provided for each discharge cell group that emits light, and the number of sustain pulses is controlled for each separate sustain pulse applying circuit to adjust the brightness and further the chromaticity at the time of color mixing. be able to.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a color
It shows the circuit configuration of the plasma display device,
One pixel P is composed of cells of two primary colors (red and green) 3
The present invention is applied to a display device that performs color display (red, green, and yellow that is a mixed color of both). In this embodiment, the pixel structure of the panel is such that two primary color cells R and G are arranged in the vertical direction. That is, the discharge cells R that emit red light in each pixel are odd-numbered lines Y ₁ , Y ₃ , ... Y.
_The discharge cells G that emit green light are arranged in even lines Y ₂ , Y ₄ , ... Y _m . The high voltage drive output from the first horizontal electrode driver IC-A41 is applied to the horizontal electrodes corresponding to the odd-numbered lines, while the second horizontal electrode driver IC-B42 is applied to the horizontal electrodes corresponding to the even-numbered lines. The high-voltage drive output is applied. In the following drawings, FIG. 12 or FIG.
The parts corresponding to are given the same reference numerals.

FIG. 2 illustrates each drive waveform in the device of FIG. 1 in a timing diagram, and shows drive waveforms in one drive cycle as in the case of FIG. That is, FIG. 2A shows a drive waveform for one drive cycle in the vertical electrode waveform applied from the vertical electrode driver 3 to a certain vertical electrode ( _Xn ), and FIG. A horizontal electrode waveform applied from the horizontal electrode driver 41 to a certain horizontal electrode (in this case, it means an odd line in which the display data for the discharge cell is rewritten, and the line is now Y ₁ ). Medium drive cycle (drive cycle in which display data for that line is rewritten)
2C shows the drive waveforms for a minute, and similarly, FIG. 2C means an even line from the horizontal electrode driver 42 to a certain horizontal electrode (in this case, the display data for the discharge cell is rewritten. The driving waveform for one driving cycle (the driving cycle for rewriting the display data for the line) in the horizontal electrode waveform applied to the line is assumed to be Y ₂ .

Further, FIG. 2 (D) shows the above driving cycle.
Corresponding cell (transverse electrode Y₁And vertical electrode X _nLocated at the intersection with
The discharge cells) by the drivers 3 and 41
(That is, the write cancel pulse WC
Cell voltage waveform (when Y is off) (Y₁-X_n),
On the other hand, FIG. 2 (E) shows the corresponding cell in the above driving cycle.
(Horizontal electrode Y₂And vertical electrode X_nThe discharge cell located at the intersection with
Is written by drivers 3 and 42 to
Cell voltage waveform (Y₂-X_n) Is shown. Na
2 (D) and 2 (E) are as described above.
(Y₁-X_n), (Y ₂-X_n), But in the figure
2 (A), 2 (B), 2 (C) (X
_n, Y₁, Y₂In the horizontal direction
Has been.

As described above, in the driving cycle in which the data is rewritten for the line, the horizontal electrode waveform applied to the line is divided into the address period and the sustain discharge period, and the former function is shown in FIG. Is the same as that described in. On the other hand, the driver ICs (horizontal electrode driver ICs in this embodiment) that generate the sustaining pulse MP are for odd lines (Y ₁ , Y ₃ , ... Y _m-1 ) and even lines (Y ₂ , Y ₂ ).
₄ , ... Y _m ), so that the sustaining pulse MP is applied a different number of times from the driver ICs (41 and 42) for each line to each line (odd line and even line). Is possible.

Then, as shown in FIGS. 2B and 2D, the sustain discharge pulse MP applied to the odd line is 1
Since the thinning-out is performed once every 0 times (MP 'in the figure indicates that the sustaining pulse is thinned out), the sustaining discharge is as shown by the light emitting point of the arrow in FIG. 2 (D). , During the sustain discharge period (that is, excluding the address period) 18
2 times (only 14 arrows are shown in FIG. 2D), but as described above, FIG. 2D is in the lateral direction as compared with FIGS. 2A to 2C. Are shown magnified and are actually generated 18 times in this example). Then, the sustaining pulse MP does not discharge unless it is applied alternatingly alternatingly while inverting the polarity. Therefore, when sustaining pulses having the same polarity are continuously applied (indicated by * in FIG. 2D). Two
No discharge occurs in the pulse after the first time. On the other hand, since the sustain discharge pulse MP applied to the even-numbered lines is not thinned out, the sustain discharge occurs 20 times during the above-mentioned sustain discharge period (also in this case, only 16 arrows are shown in FIG. 2E). However, for the reasons mentioned above, it is actually 20 in this example.
Occurs repeatedly). Therefore, in the end, the luminance ratios of the discharge cells respectively corresponding to the odd lines and the even lines are approximately 9:10 in this case, and thus the ratio of the red and green color mixture is approximately 9:10.

As described above, by appropriately thinning out one or both of the sustain pulses of the odd-numbered line and the even-numbered line, it is possible to arbitrarily select the luminance and the color mixture ratio in the case of monochromatic light emission, and to set the chromaticity. It becomes possible to adjust. In this case, the sustain pulse may be thinned out not only in the driving cycle in which the data is rewritten for the line but also in all the driving cycles in the line over one frame period. The sustain pulse can be thinned out only for a drive cycle (for example, a drive cycle in which data is rewritten on the line as described above).

FIG. 11 shows a concrete example for arbitrarily adjusting the number of thinning-out of the sustain pulse for the predetermined line. One input terminal of the AND gate AND is, for example, from the drive wave forming pulse generator to the sustain pulse. A drive wave in which pulses have not been thinned (for example, a horizontal electrode drive wave) is input, while the other-side input terminal of the AND gate AND is, for example, always at a high level, and the sustain pulse is thinned during the period. By inputting the control pulse that is at a low level only, the drive wave in which the sustain pulse is thinned a predetermined number of times can be supplied from the output side to the corresponding driver. The number of times the sustain pulse is thinned can be adjusted by adjusting the length of the low level period of the control pulse. For adjusting the length of the low level period of the control pulse, for example, a manual semi-fixed volume control is used. Can be used and can be arbitrarily changed according to the volume position (resistance value). In the thinning out of the sustain pulse, it is not always necessary to thin out in the middle part of the sustaining discharge period as shown in the figure, and it may be thinned out a predetermined number of times near the beginning or end of the sustaining discharge period.

FIG. 3 shows a circuit structure of a color plasma display device as a second embodiment of the present invention. One pixel P is composed of cells of three primary colors (red, green and blue). The present invention is applied to a display device that performs color display (eight colors including unlit black). In this embodiment, the panel has a pixel configuration in which three primary color cells R, G and B are arranged in the vertical direction. That is, the discharge cells R that emit red light in each pixel are connected to each line (Y ₁ , Y
₄ , ... Y _m-2 ), the high-voltage drive output from the first lateral electrode driver IC-A41 is applied, and the discharge cells G that emit green light are arranged in each line (Y ₂ , Y ₅ , ...). Y
_m-1 ) and the second lateral electrode driver IC-
High drive output from the B42 is applied, a discharge cell B further emits blue light each line _{(Y 3, Y 6, ...} Y m) be arranged in a high pressure drive from the third lateral electrode driver IC-C43 Output is applied. In this way, the driver ICs for the horizontal electrodes are separated into three systems, and different thinned sustain pulses can be applied to the corresponding lines.

FIGS. 4 and 5 are timing charts showing the respective drive waveforms in the device of FIG. 3, and the drive waveforms are shown in the same way as in the case of FIG.
That is, among the horizontal electrode drivers of the above three systems, the sustain pulse MP applied to the corresponding line (for example, Y ₁ ) from the first horizontal electrode driver 41 is not thinned, but the second horizontal electrode driver 42 corresponds. The sustain pulse MP applied to the line (for example, Y ₂ ) is decimated once every 10 times,
Further, the sustain pulse MP applied from the third lateral electrode driver 43 to the corresponding line (for example, Y ₃ ) is thinned out twice every 10 times (see MP ′ in FIG. 4).

Therefore, the sustain discharge is (E) in FIG.
As shown as light emitting points of arrows in (F) and (G), for example, in the cell corresponding to the line Y ₁ , the discharge occurs 20 times during the sustain discharge period due to the reason described above.
For example, in the cell corresponding to the line Y ₂ , the sustain discharge is 18
For example, the sustain discharge occurs 16 times in the cell corresponding to the line Y ₃ . In this way, the three primary colors (red,
The ratio of the brightness of green and blue) and the ratio of the mixed colors are approximately 10:
It can be 9: 8.

FIG. 6 shows a circuit structure of a color plasma display device as a third embodiment of the present invention. A display in which three primary color cells R, G, B in one pixel are arranged in the lateral direction. The present invention is applied to an apparatus. That is, the discharge cells R that emit red light in each pixel are arranged in each line (X ₁ , X ₄ , ... X _m-2 ) and the high voltage drive output from the first vertical electrode driver IC-A31 is applied. , And the discharge cells G that emit green light are arranged in each line (X ₂ , X ₅ , ... X _m-1 ), and the high voltage drive output from the second vertical electrode driver IC-B 32 is applied to the discharge cells G, and further blue discharge cell B emission for each line _{(X 3, X 6, ...} X m) be arranged in a high pressure drive output from the third longitudinal electrode driver IC-C33 is applied. In this way, the vertical electrode driver ICs can be separated into, for example, three systems, and different sustain pulses that have been thinned can be applied to the corresponding lines.

FIGS. 7 and 8 are timing charts showing examples of the drive waveforms in the apparatus shown in FIG.
First vertical electrode driver 3 of the vertical electrode drivers of the system
Although the sustain pulse MP applied from 1 to the corresponding line (for example, X ₁ ) is not thinned, the second vertical electrode driver 3
The sustain pulse MP applied from 2 to the corresponding line (for example, X ₂ ) is thinned out once every 10 times, and the sustain pulse applied from the third vertical electrode driver 33 to the corresponding line (for example, X ₃ ). MPs are decimated twice every 10 times.

Therefore, the sustain discharge is (E) in FIG.
As shown in (F) and (G), for example, in the cell corresponding to the line X _1, it occurs 20 times as described above during the sustain discharge period, whereas in the cell corresponding to the line X ₂ , for example. The sustain discharge occurs 18 times, and for example, line X
_In the cell corresponding to ₃ , the sustain discharge occurs 16 times. Thus, in this example as well, the luminance ratio and the color mixture ratio of the three primary colors (red, green, and blue) can be set to approximately 10: 9: 8.

Further, in a panel in which one pixel is composed of a total of 4 cells of (vertical 2) × (horizontal 2) cells, the above-mentioned means are combined and both vertical electrodes and horizontal electrodes are driven by a divided driver. By controlling the number of sustain pulses as described above, it is possible to adjust the luminance of each single-color cell and the chromaticity when color mixing is performed. FIG. 9 shows a circuit configuration when the present invention is applied to a surface discharge type three-electrode structure as a color plasma display device as a fourth embodiment of the present invention. Further, FIG. 10 shows a detailed configuration of the discharge cell portion in the device of FIG. The vertical electrode driver 3 shown in FIG. 9 only generates the write cancel pulse WC in the address period (that is, the pulse WC is turned off or on depending on whether or not writing is performed in the discharge cell), On the other hand, the common electrode driver 44 only generates the sustain pulse MP during the sustain discharge period, and the sustain pulse is commonly applied to all the discharge cells on the panel 5. On the other hand, the lateral electrode driver is divided into three systems of drivers 41, 42 and 43 as shown in the embodiment of FIG. 3, and the same drive waves as those described with reference to FIGS. 4 and 5 emit red light. Lines (Y ₁ , Y ₄ , ... Y _m-2 ) corresponding to the cell R and lines (Y ₂ , Y ₅ , ...) Corresponding to the green light emitting cell G.
Y _m-1 ) and the line (Y
₃ , Y ₆ , ... Y _m ) are separately applied. The sustain discharge in each discharge cell occurs between the electrode connected to the lateral electrode driver shown in FIG. 10 and the electrode connected to the common electrode driver.

Therefore, even in such a surface discharge type three-electrode structure panel, the driver of the non-common sustain discharge electrodes (that is, the lateral electrode driver) is divided into a plurality of systems (three systems in the case of FIG. 9). Thus, in the case of a panel in which cells (R, G, B, etc.) in the pixel P are arranged in the vertical direction, the number of sustain pulses from each horizontal electrode driver is controlled as described above to obtain the main pixel. The invention can be applied to adjust the above luminance and chromaticity.

[0039]

According to the present invention, it is possible to suppress variations in luminance and chromaticity among panels without improving the process accuracy at the time of panel manufacturing so much, and it is possible to improve panel yield. .. Further, even when a plurality of the same panels are used to form one display device, uniform brightness and chromaticity can be obtained in all the panels, and the quality can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of a color plasma display device as a first embodiment of the present invention.

2 is a timing diagram illustrating each drive waveform in the device of FIG.

FIG. 3 is a diagram showing a circuit configuration of a color plasma display device as a second embodiment of the present invention.

4 is a timing diagram illustrating each drive waveform in the device of FIG.

5 is a timing diagram illustrating each drive waveform in the device of FIG.

FIG. 6 is a diagram showing a circuit configuration of a color plasma display device as a third embodiment of the present invention.

7 is a timing diagram illustrating each drive waveform in the device of FIG.

8 is a timing diagram illustrating each drive waveform in the device of FIG.

FIG. 9 is a diagram showing a circuit configuration of a color plasma display device as a fourth embodiment of the present invention.

10 is a diagram showing a detailed configuration of a discharge cell portion in the apparatus of FIG.

FIG. 11 is a diagram illustrating a specific example for controlling the number of sustain pulses in the present invention.

FIG. 12 is a diagram illustrating a circuit configuration of a plasma display device in the related art.

13 is a timing diagram illustrating each drive waveform in the device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Power supply circuit 2 ... Control circuit 3 ... Vertical electrode driver 4 ... Horizontal electrode driver 5 ... Panel 31, 32, 33 ... Vertical electrode driver of division structure 41, 42, 43 ... Horizontal electrode driver of division structure 44 ... Common electrode driver

Claims (2)

[Claims] 1. A color plasma display in which one pixel is composed of a plurality of discharge cells that emit light of different emission colors, and a large number of the pixels are arranged in a matrix, wherein each pixel has the same emission color. By controlling the number of sustain pulses to be applied for each discharge cell group that emits light, it is possible to change the chromaticity of the color due to the light emission of the plurality of discharge cells in each pixel over the entire screen. Characterized is a chromaticity modulation method for a color plasma display. 2. A color plasma display in which one pixel is composed of a plurality of discharge cells that emit light of different emission colors, and a large number of the pixels are arranged in a matrix, wherein each pixel has the same emission color. A sustain pulse applying circuit is provided for each discharge cell group that emits light, and the number of sustain pulses is controlled for each separate sustain pulse applying circuit, so that the plurality of discharge cells emit light in each pixel. A chromaticity modulation device for a color plasma display, characterized in that the chromaticity of the color due to is changed over the entire screen.