JP2002287704A - Plasma addressed liquid crystal display device and driving method thereof - Google Patents

Abstract

(57) [Summary] A crosstalk (DDC) can be made compatible with high definition without increasing the width of a black matrix even if the required plasma discharge rate is low. A plurality of signal electrodes are respectively defined by a central virtual dividing line on a display screen so that the advantages of frame inversion driving, which is superior in display quality and plasma discharge speed, can be utilized as compared with conventional line inversion driving. The display is divided into upper and lower parts, and scanning is performed from the display line near the central virtual division line L to the display lines at the upper and lower ends so that the scanning direction is line-symmetric with the central virtual division line L. , The occurrence of crosstalk (DDC) can be suppressed, for example, the color mixture in a normally black PALC display device can be suppressed, and the normally white PALC can be suppressed, for example.
In the display device, the brightness of the monochromatic display can be improved, and a large-sized high-definition flat display with high quality can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma addressed liquid crystal display device (hereinafter referred to as a PALC display device) which can be used for a technique for realizing a large-sized flat display, and a driving method thereof.

[0002]

2. Description of the Related Art A PALC display device has been conventionally known as a liquid crystal display device as a flat display device. This PA
In a liquid crystal display panel 100 of an LC display device, a plasma cell unit 101 and a liquid crystal cell unit 102 are vertically divided by a thin glass 103 as shown in FIG.

[0003] The plasma cell unit 101 includes a plasma substrate 1.
04, a plasma electrode 105 for performing a plasma discharge disposed on the plasma substrate 104, and a plasma substrate 1
The plasma cell portion 101 has a rib 106 for supporting the thin glass 103 with respect to the plasma cell portion 04. The plasma cell portion 101 is sealed inside and filled with an ionizable gas to form a plasma channel 107.

The liquid crystal cell section 102 is sealed by sandwiching a liquid crystal layer 109 between a thin glass 103 and a color filter substrate 108 (hereinafter, referred to as a CF substrate 108).

On a CF substrate 108, a color filter layer 110, an overcoat layer 111, and a plurality of signal line electrodes (transparent electrodes) 112 are laminated in this order. Also,
The signal line electrode (transparent electrode) 112 is connected to the plasma electrode 105.
Are arranged separately for each of the colors (R, G, B) at the upper and lower positions so as to be orthogonal to.

When plasma discharge is performed in the plasma cell unit 101, as shown in FIG. 10, a plasma channel is generated as if a virtual electrode 113 was generated on the opposite surface of the thin glass 103 on the plasma cell unit 101 side. 107 becomes conductive, and the virtual electrode 113 becomes the anode potential. When the voltage applied to the signal line electrode 112 is changed in this state, a potential difference occurs in the liquid crystal layer 109.
In this state, when the plasma discharge is turned off, the plasma channel 107 becomes insulated, and the potential difference written in the on state is preserved. Therefore, even if the potential of the signal line electrode 112 changes, the stored potential difference causes The image does not change. Although not shown in FIGS. 9 and 10, the liquid crystal display cell portion 102 has a black matrix (BM), an alignment film, a spacer, and the like.

Next, the system configuration will be described. As shown in FIG. 11, the PALC display device can directly drive the liquid crystal display panel 100 with a progressive signal such as an analog RGB signal used for a computer or the like as an input signal. In such a case, the image signal buffer 121 is unnecessary, but in the case of an interlace signal used for TV broadcasting or the like, the image signal buffer 121 is required to convert the signal into a progressive signal. Image signal buffer 121
To store image data for one frame (two cycles in the case of an interlace). An image signal corresponding to any of the scanning lines K1 to Kn sequentially selected by the panel scanning circuit 122 is transmitted from the panel signal circuit 123 to the liquid crystal display panel 100. Are input to the data lines D1 to Dm, and the scanning for selecting the scanning lines K1 to Kn is sequentially repeated, so that one frame of image data is displayed on the data lines D1 to Dm of the display panel 100.
To drive the display.

[0008]

In the above-mentioned conventional PALC display device, when the liquid crystal display panel 100 (panel module) is driven in one frame by one inversion, the image data of all one frame is replaced by the image data of the same sign. An input image frame is formed, and the next frame is formed by image data of the opposite sign. In this case, FIG.
As shown in FIG. 2A, the lower the display screen, the larger the image quality of the crosstalk amount. Also, the liquid crystal display panel 10
When 0 is driven by one line inversion, the polarity of the image data is inverted every time a scanning line is selected, and the position of the image data polarity inversion is delocalized, as shown in FIG. The image quality becomes the average crosstalk amount of the frame inversion over the entire screen. The details will be described below. Although the gradations of light and shade in FIGS. 12A and 12C are described as changing stepwise for convenience, they actually change continuously.

In the case of this PALC display device, DDC (data-diffusio) is generated as unique crosstalk.
nX-Talk). This crosstalk (DD
13C, as shown in FIG. 13, for example, the electric charge e is held on the lower surface side of the thin glass 103 immediately below the signal line electrode 112b at the position where the signal voltage is applied, and the electric charge e
And the potential of the signal line electrode 112a adjacent to the signal line electrode 112b greatly increases, the potential difference in the vertical direction between the electrode end face of the signal line electrode 112a and the held charge e ( An electric field E) indicated by an arrow is generated.

This crosstalk (DDC) appears remarkably in a driving method (for example, one-frame one-inversion driving) in which at least one signal line is supplied with the same sign potential for one frame for one frame.

That is, FIG. 14 shows the state of the lowermost display line when the frame is inverted with the same signal from the upper part to the lower part of the display screen in the case of the one frame one inversion drive. In this state, if positive polarity image data is applied to the signal line electrodes 112a and 112b of the lowermost display line, immediately after a signal blanking period (the state shown in FIG. This state continues until selection), and as shown in FIG. 15, the writing of the next frame (the polarity is inverted in one frame 1 inversion) starts,
Since the polarities of the signal line electrodes 112a and 112b change to minus, the potential difference is held, and the virtual potential on the lower surface of the thin glass 103 is largely shifted to the minus side, and crosstalk (DDC) is most likely to occur. For one frame period.

This phenomenon increases sequentially from the upper display line to the lower display line due to different exposure times to the inverted potential. As described above, in the driving method in which a potential of the same sign is applied to at least one signal line between frames, color mixing is caused by crosstalk (DDC) peculiar to the PALC display device, and the color purity of the display is reduced. Problem.

[0013] By hiding the ends of the electrodes that cause this color mixture by enlarging the width of the black matrix (BM), some measures can be taken.
When the width of M) is increased, the transmittance is greatly reduced.
In order to make the display screen the same brightness as compared to the case where the width is not enlarged, the emission luminance of the backlight must be increased by that amount, which requires a significant increase in power consumption. Have a problem.

In the line inversion drive in which each line is inverted, it is possible to solve the difference in color mixing between the upper part of the display screen and the lower part of the display screen due to the crosstalk (DDC). When the frame period is maintained due to the accompanying increase in the number of lines, it is required that the plasma discharge be turned on / off at a high speed. If the speed is not sufficiently high, the write polarity of the next line has a different sign, so that they cancel each other out. As a result, the writing of the liquid crystal becomes insufficient, thereby causing a problem that the transmittance is greatly reduced.

The present invention solves the above-mentioned conventional problems, and requires a plasma discharge speed required for a cross talk (DDC) peculiar to a PALC display without increasing the width of a black matrix (BM). It is an object of the present invention to provide a PALC display device capable of coping with high definition of a display screen even when the display device is low, and a driving method thereof.

[0016]

A PALC display device according to the present invention comprises: a plurality of signal electrodes arranged in parallel in a predetermined direction;
In a plasma addressed liquid crystal display device provided with a plurality of discharge electrode pairs arranged in parallel in a direction intersecting with the signal electrodes, each of the plurality of signal electrodes has a first signal at a central virtual dividing line on a display screen. An electrode and a second signal electrode, and the plurality of discharge electrode pairs are divided into a first discharge electrode pair group and a second discharge electrode pair group by a central virtual dividing line on the display screen, With respect to the first signal electrode group and the first discharge electrode pair group and the second signal electrode group and the second discharge electrode pair group, each of the display screen regions divided by the central virtual dividing line on the display screen. A display driving means for independently performing frame inversion driving is provided, thereby achieving the above object.

Preferably, in the PALC display device according to the present invention, the display driving means applies a first signal circuit for applying an image signal to the first signal electrode group, and applies an image signal to the second signal electrode group. A second scanning circuit that sequentially drives the first discharge electrode pair group; and a second scanning circuit that sequentially drives the second discharge electrode pair group. Display driving of the first signal electrode group and the first discharge electrode pair group corresponding to one side of the dividing line, and
When the second signal electrode group and the second discharge electrode pair group corresponding to the other side of the central virtual division line on the display screen are driven for display, the second signal electrode group and the second discharge electrode pair group are line-symmetrically aligned with the central virtual division line on the display screen. Frame 1 inversion driving is performed.

Still preferably, in a PALC display device according to the present invention, the first scanning circuit and the second scanning circuit scan so as to sequentially drive from a discharge electrode pair near the central virtual dividing line.

Still preferably, in a PALC display device according to the present invention, a shielding wall for providing a discharge space by a discharge electrode pair is provided, and the central imaginary dividing line is provided on the shielding wall and the discharge electrode. It is located in any of the above.

Further, preferably, the central virtual dividing line on the display screen in the PALC display device of the present invention is a virtual line dividing the display screen vertically or horizontally.

Preferably, a method of driving a PALC display device according to the present invention is a method of driving a plasma addressed liquid crystal display device according to any one of claims 1 to 5,
The frame inversion drive is performed independently for each display screen area divided by the central virtual division line on the display screen, thereby achieving the above object.

Further, preferably, in the frame inversion drive in the method for driving a PALC display device of the present invention, the polarity is inverted every plural frame periods.

Still preferably, in a method of driving a PALC display device according to the present invention, a non-discharge period is equal to or more than half of the frame period.

With the configuration of the present invention described above, in a PALC display device using plasma as a switching element, the advantages of frame inversion driving, which is superior in display quality and required plasma discharge speed, to line inversion driving, are utilized. By dividing each of the plurality of signal electrodes vertically or horizontally with respect to the display screen area, and making the scanning direction (scanning direction) line-symmetrical with the central virtual dividing line,
It is possible to suppress the generation of crosstalk (DDC) peculiar to a PALC display device. For example, color mixture in a normally black PALC display device is suppressed, and for example, in a normally white PALC display device, a single color display is performed. This improves the brightness of the display and makes it possible to realize a large, high-definition flat display with high quality.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments 1 to 3 of a PALC display device of the present invention will be described with reference to the drawings. (Embodiment 1) FIG.
FIG. 2 is a block diagram illustrating a main configuration of the ALC display device.

The PALC display device 1 has an upper panel signal circuit 2 as a first signal circuit, a lower panel signal circuit 3 as a second signal circuit, an upper panel scanning circuit 4 as a first scanning circuit, and a second panel signal circuit. Lower panel scanning circuit 5 as scanning circuit
, An image signal buffer 6, a control circuit 7 for controlling them, and a liquid crystal display panel 10 driven for display by these.
And

The upper panel signal circuit 2 applies an image signal to a plurality of signal lines DU1 to DUm as an upper signal line group.

The lower panel signal circuit 3 applies an image signal to a plurality of signal lines DD1 to DDm as a lower signal line group.

The upper panel scanning circuit 4 sequentially drives and drives scanning signals to a plurality of scanning lines KU1 to KUn as an upper scanning line group.

The lower panel scanning circuit 5 sequentially drives and drives scanning signals to a plurality of scanning lines KD1 to KDn as a lower scanning line group.

The image signal buffer 6 may be unnecessary when the conventional image signal buffer 121 is a signal that can directly drive a panel module.
This is necessary for the divided configuration, and stores one frame of image signals input to the system.

The upper panel signal circuit 2, the lower panel signal circuit 3, the upper panel scanning circuit 4, the lower panel scanning circuit 5,
The image signal buffer 6 and the control circuit 7 constitute a display driving means 8, and the control circuit 7 includes the upper panel signal circuit 2, the lower panel signal circuit 3, the upper panel scanning circuit 4, the lower panel scanning circuit 5, and the image signal. By controlling the buffer 6, frame inversion driving is performed independently for each display screen area vertically divided into two by a central virtual dividing line L (indicated by a two-dot chain line) on the display screen area of the liquid crystal display panel 10. Is what you do.

The liquid crystal display panel 10 has a plasma cell section 11 and a liquid crystal display section 12, as shown in FIGS. 2 (a) and 2 (b).

The plasma cell section 11 includes a plasma substrate 13
A rib 15 serving as a supporting shielding wall provided to secure an internal discharge space is sandwiched between the glass sheet 14 and the thin glass 14, and the internal discharge space is filled with an ionizable gas. It is sealed as a plasma channel 16.

The liquid crystal display cell section 12 has a liquid crystal layer 18 sandwiched between the thin glass 14 and the CF substrate 17 and is sealed inside.

On the surface of the CF substrate 17 facing the plasma substrate 13, a color filter layer 19 (hereinafter referred to as CF19), an overcoat layer 20, and a plurality of signal line electrodes 21 (signal electrodes) for applying data signals are provided. They are arranged in this order. Also, the CF substrate 17 on the plasma substrate 13
A plasma electrode 22 as a plurality of discharge electrode pairs (a cathode electrode and an anode electrode) is disposed on the surface facing the substrate, and a plasma discharge from the plasma electrode 22 is used.
The voltage applied to the liquid crystal layer 18 is controlled. The plurality of signal line electrodes 21 and the plurality of plasma electrodes 22 are arranged in plural in a predetermined direction, respectively, and are orthogonal to each other at a vertical position.

Each of the plurality of signal line electrodes 21 is a central virtual dividing line L on the display screen, and the upper signal line electrode 211 as a first signal electrode and the lower signal line electrode 2 as a second signal electrode.
12 are divided into two vertically. In addition, the plurality of plasma electrodes 22 are located on the central virtual dividing line L on the display screen.
The first and second discharge electrode pairs 221 and 222 are vertically divided into two. The central virtual dividing line L is a virtual line indicating a dividing position at which the display screen area is vertically divided into two.

In order that the division boundary where the central virtual division line L is located is not conspicuous on the display screen, the division position must be formed at a position corresponding to the rib 15 or the plasma electrode 22. Is preferred. In FIG. 2B,
The case where the division position is located on the rib 15 is shown.

In the PALC display device 1 having the above configuration,
The scanning direction (arrow) of the scanning signal is shown in FIGS.
(B) shows the degree of color purity of the liquid crystal display screen in the case of (b). Although the gradations of light and shade in FIGS. 3A to 3C are described as changing stepwise for convenience, they actually change continuously.

In the first embodiment, flicker is a concern 3
An upper limit value is determined based on the product of the plasma switch speed and the number of display lines, with 0 Hz as a lower limit, and a frame frequency of 6 Hz.
When scanning is performed at 0 Hz in a direction in which the center division position is set as the first display line of the scan and spreads from the center of the screen toward the upper end and the lower end, respectively (FIG. 3A), on the contrary, the upper end is set as the first display line of the scan In the case where scanning is performed from the side and the lower end toward the center divided position (FIG. 3)
(B)), in any case, since the image quality is higher at the head of the frame with less crosstalk, the observer is generally worried about the image quality at the center of the image. 2A, the frame scanning direction from the center side to the upper and lower ends in FIG. 2A is more preferable.

As described above, according to the first embodiment, the crosstalk (DDC) can be reduced over the entire display screen as compared with the conventional frame inversion drive and line inversion drive, and color reproduction with high color purity can be achieved. Sex can be obtained.

(Embodiment 2) In the second embodiment, the frame inversion frequency (in what frame display the signal code is inverted) in the first embodiment is a case where two frames and one inversion drive are performed.

If the reversal period of the frame is long as in the two-frame one-reversal drive shown in FIG. 4, a phenomenon that a display image remains, that is, a so-called liquid crystal burn-in occurs.
If the frame inversion cycle is short as in the frame 1 inversion drive, the image quality in the latter half of the frame is particularly deteriorated due to the influence of crosstalk (DDC) or the like for the various reasons described above. Therefore, in the second embodiment, two-frame one-inversion driving is performed using the configuration of the first embodiment.

In the second embodiment, the image quality of the central portion of the display screen area (FIG. 3A) is the image quality of the upper part of the screen when one frame is inverted (when scanning is performed from the upper line to the lower display line). In this case, there is almost no crosstalk, and the image quality of the upper and lower end portions of the second embodiment (FIG. 3A) is the image quality near the center of one frame 1 inversion (FIG. 12 ( a)). In the display screen according to the second embodiment, the image quality of the display screen (FIG. 12A) corresponding to the lower display line of the conventional one frame 1 inversion does not exist, and the deterioration of the image quality of the entire display screen is greatly reduced. Could be suppressed.

As described above, according to the second embodiment, when the frame inversion cycle is 60 Hz (60 signal polarity inversions per second), the plasma switching speed is 20 μSec, and the number of display lines on the display is 800, the display period Two sets of 8 mSec and a set of about 0.35 mSec for the blank period can be drawn with the same polarity, and the crosstalk amount over the entire display screen of the second embodiment is 2
This is the amount of crosstalk generated between the upper 1/4 and 3/4 portions of the frame 1 inversion drive. FIG. 6 shows the amount of crosstalk occurrence in the case of one frame and one inversion drive.

FIGS. 5 and 6 will be described in more detail below. In FIGS. 5 and 6, the worst state of the crosstalk is set to "1" assuming that the crosstalk amount increases in proportion to the first display line to the last display line of the frame inversion drive. In the case where the screen configuration is divided into two as in the present invention, the description will be focused on one of the screens.

FIG. 6 shows the conventional case of one frame and one inversion.
FIG. 5 shows a case where one frame is inverted in two frames and the maximum stroke generation amount displayed in the screen is shown. In order to improve the uniformity of the display, the image quality should be set closer to the side with poor image quality (large crosstalk), and the overall image quality is reduced.

In the case of one inversion in one frame of the related art shown in FIG. 6, since the screen configuration is not divided into two as in the present invention,
The display extends from the driving start display line of one frame (crosstalk amount is “0”) to the driving rear end display line (crosstalk amount is “1”) on the screen. In other words, since the pixels having the smallest crosstalk amount on the display line at the rear end of the drive from the pixels having the smallest crosstalk amount on the first display line are also displayed on the same display screen, the crosstalk at the rear end portion of the drive on the display screen is performed. There is a place where "1" has the worst talk generation amount (prior art). When the screen configuration is divided into two by one frame and one inversion as in the first embodiment of the present invention, the range of crosstalk occurrence is poor in image quality (large crosstalk) in order to adjust display uniformity. Figure 6)
If the uniformity of the display is not adjusted, the range can be changed to the range of the second embodiment.

On the other hand, FIG. 5 shows a case where one frame is inverted in two frames. Since the screen configuration is divided into two, the number of display lines is halved, and it is not necessary to display the latter half.
It takes half the time to display the entire screen. Therefore, consider writing the screen twice. The crosstalk amount in the display screen is the display of the driving head, and the average of the driving head and the driving center (the average of "0" and "1/2" is "1").
/ 4 "), and in the display of the driving rear end, the average of the driving center and the driving rear end (the crosstalk amount is" 3/4 "on the average of" 1/2 "and" 1 "). Embodiment 2 of the present invention
When the screen composition is divided into two by two frames and one inversion, and the display uniformity is not adjusted (when the screen is not written twice)
In this case, the range of occurrence of crosstalk can be the range of the second embodiment in FIG.

As described above, if the portion of the display screen having the worst image quality is improved, the overall image quality can be improved even if the display uniformity of the screen is adjusted. (Embodiment 3) As Embodiment 3, the blank period of the frame inversion drive in the configuration of Embodiment 1 is defined as follows: blank period = frame period−display period display period = plasma switching speed × number of display display scanning lines / 2. FIG. 7 shows a defined timing chart.

In the third embodiment, the frame frequency is set to 60
Hz, the plasma switching speed is 20 μSec, and the number of display lines on the display is 800, the display period is 8 mSec, and the blank period is about 8.7 mSec. In this case, about half of the frame frequency is a blank period, and as shown in FIG. 8, the crosstalk amount in the entire display area is such that the crosstalk between the display line in the upper part of the conventional frame inversion driving and the half portion is generated. Amount. That is, FIG. 8 shows a case in which half of the frame is blank (since the screen configuration is divided into two, the number of display lines is half, and the latter half need not be displayed). The amount of crosstalk generated is の of that of the related art (Example 2). When uniformity of display is adjusted, the range of occurrence of crosstalk can be the range of the first embodiment in FIG.

As described above, the display blank (non-discharge period)
Is preferably equal to or more than one half of the frame rewriting cycle (frame cycle). In this manner, the present invention can provide a PALC display device with higher image quality than the conventional frame inversion drive without increasing the plasma switching speed in response to the increase in the number of lines associated with higher definition. it can.

As described above, according to the first to third embodiments of the present invention, a plurality of signals are provided so that the advantages of the frame inversion driving, which is superior in display quality and plasma discharge speed, can be utilized as compared with the conventional line inversion driving. Each of the electrodes is vertically divided into two parts by a central virtual dividing line L on the display screen, and the upper and lower ends of the display are displayed from the display line near the central virtual dividing line L so that the scanning direction is line-symmetric with the central virtual dividing line L. By scanning toward the line, the crosstalk (D
DC) can be suppressed, and for example, color mixing in a normally black type PALC display device can be suppressed,
Further, for example, in a normally white type PALC display device, the luminance of monochromatic display can be improved, and a large-sized high-definition flat display with high quality can be realized.

In the first to third embodiments, the plasma cell section 11 composed of the plasma substrate 13, the ribs 15, the thin glass 14, the plasma channel 16, and the like are used.
Liquid crystal cell unit 1 composed of substrate 17, liquid crystal layer 18, etc.
2 and the CF substrate 17 is a plasma substrate 13
And a signal line electrode 21 for applying a data signal to a surface facing the semiconductor device, and the plasma cell unit 11 has a plasma electrode 22 therein to utilize plasma discharge for switching,
This is a PALC display device for controlling a voltage applied to a liquid crystal layer 14, wherein a signal electrode 21 is divided into upper and lower portions of a liquid crystal display screen on a rib 15 or a plasma electrode 22, and the upper and lower portions of the liquid crystal display screen region are respectively arranged. PAL that can be driven independently
C display device, and upper and lower panel scanning circuits 4, 5
Then, the display lines are sequentially scanned independently, and the image signals of the selected display lines are redistributed from the image signal buffer 6 to the upper and lower panel signal circuits 2 and 3 and input to the liquid crystal display panel 10 to be vertically shifted. PAL for 1 frame 1 inversion drive and 2 frames 1 inversion drive with the divided positions as symmetric
Although the C display device has been described, the present invention is not limited to this, and the frame rewriting cycle may be another one-frame inversion drive. Preferably, from the viewpoint of flicker, the polarity inversion is performed once every two frames. Is more preferred.

In the first to third embodiments, each of the plurality of signal electrodes is divided into a first signal electrode and a second signal electrode by a central imaginary dividing line L on the display screen. The pair is divided into a first discharge electrode pair group and a second discharge electrode pair group by a central virtual division line L on the display screen, and the first signal electrode group, the first discharge electrode pair group, and the second signal For the electrode group and the second discharge electrode pair group, frame inversion driving is performed independently for each display screen region divided by the central virtual dividing line on the display screen.
However, the present invention is not limited to this. The first signal electrode, the second signal electrode, and the third signal electrode are each divided into three by two virtual dividing lines L ′ on the display screen, and a plurality of discharge electrode pairs are virtually displayed on the display screen. The first discharge electrode pair group, the second discharge electrode pair group, the third
A first electrode group; a first electrode group; a second electrode group; a second electrode group; a third electrode group; and a third electrode group. For each of the display screen regions divided by the two virtual division lines L ′ on the display screen, frame inversion driving (two frame one inversion driving or one frame one inversion driving may be performed) is performed independently. It may be configured as follows. The above is the case where the display screen is divided into three in the scanning direction, but may be divided into four, five or even n (n is a natural number of 2 or more).

In the case of n division, the plasma addressed liquid crystal display of the present invention comprises a plurality of signal electrodes arranged in parallel in a predetermined direction and a plurality of discharge electrodes arranged in parallel in a direction crossing the signal electrodes. In a plasma addressed liquid crystal display device provided with an electrode pair, each of the plurality of signal electrodes is divided into n from the first signal electrode to the n-th signal electrode by n-1 virtual dividing lines on the display screen. , The plurality of discharge electrode pairs are divided into n from the first discharge electrode pair group to the n-th discharge electrode pair group by the (n-1) virtual division lines on the display screen, and the first signal electrode group and the The first discharge electrode pair group is independent of the n-th signal electrode group and the n-th discharge electrode pair group for each display screen area divided into n by the (n-1) virtual dividing lines on the display screen. Frame inversion drive (2 frame 1 inversion drive or 1 frame inversion drive It may be a frame 1 inversion driving, a display driving means for performing even be) in three frames 1 inversion drive.

The display driving means includes: a first signal circuit for applying an image signal to the first signal electrode group; an n-th signal circuit for applying an image signal to the n-th signal electrode group; A first scanning circuit for sequentially driving the discharge electrode pair group; an n-th scanning circuit for sequentially driving the n-th discharge electrode pair group; the first signal electrode group and the first discharge electrode pair group ... When the n-th signal electrode group and the n-th discharge electrode pair group are driven for display, two-frame 1-inversion driving is performed line-symmetrically with respect to each virtual dividing line on the display screen. . In this case, the first scanning circuit to the n-th scanning circuit scan so as to sequentially drive the discharge electrode pairs in the same direction and / or in the opposite direction.

[0058]

As described above, according to the present invention, a plurality of signal electrodes are respectively provided so that the advantages of frame inversion driving, which is superior in display quality and plasma discharge speed, can be utilized over line inversion driving. By dividing the display screen and performing the scanning direction line-symmetrically at the central virtual dividing line, the PALC
It is possible to suppress the generation of crosstalk (DDC) peculiar to a display device, for example, a normally black PAL.
Color mixing in the C display device can be suppressed, and, for example, in a normally white PALC display device, the brightness of single color display can be improved, and a large-sized high-definition flat display with high quality can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main configuration of a PALC display device according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams schematically showing a configuration of a main part of the display panel of FIG. 1, wherein FIG. 2A is a plan view thereof, and FIG.
FIG. 3 is a sectional view taken along line A ′.

3A and 3B are diagrams showing the degree of color purity of a liquid crystal display screen depending on the difference in the scanning direction of a scanning signal, and FIG.
FIG. 3 is a diagram showing a standard of color purity.

FIG. 4 is a timing chart in which the frame inversion frequency in the PALC display device of FIG. 1 is set to two frames and one inversion drive as Embodiment 2 of the present invention;

FIG. 5 is an explanatory diagram showing a crosstalk generation amount in the case of two-frame one-inversion driving.

FIG. 6 is an explanatory diagram showing a crosstalk generation amount in the case of a conventional one-frame one-inversion drive.

FIG. 7 is a timing chart in the case where the display blank period is equal to or more than の of the frame period as Embodiment 3 of the present invention.

FIG. 8 is an explanatory diagram showing a crosstalk generation amount in the case of one frame and one inversion drive in a majority blank period.

9A and 9B are diagrams schematically showing a configuration of a main part of a conventional display panel, wherein FIG. 9A is a plan view thereof, and FIG.
FIG. 3 is a sectional view taken along line B ′.

FIG. 10 is a diagram schematically showing a driving state of the display panel of FIG. 9;

FIG. 11 is a block diagram illustrating a main configuration of a conventional PALC display device.

12A is a diagram showing the degree of color purity of a liquid crystal display screen in the case of conventional one-frame one-inversion driving, and FIG. 12B is a diagram showing color purity of the liquid crystal display screen in the case of conventional one-line one-inversion driving. (C) is a diagram showing a standard of color purity.

FIG. 13 is a diagram for explaining a state in which crosstalk (DDC) occurs.

FIG. 14 is a diagram showing a state of a lowermost display line at the time of frame inversion.

FIG. 15 is a diagram showing the state of the lowermost display line at the time of the next frame inversion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PALC display device 2 Upper panel signal circuit 3 Lower panel signal circuit 4 Upper panel scanning circuit 5 Lower panel scanning circuit 6 Image signal buffer 7 Control circuit 8 Display drive means 10 Liquid crystal display panel 11 Plasma cell part 12 Liquid crystal display cell part 13 Plasma Substrate 14 Thin glass 15 Rib 16 Plasma channel 17 CF substrate 18 Liquid crystal layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 622 G09G 3/20 622K 623 623V 3/28 3/28 Z F term (Reference) 2H089 HA36 QA16 TA02 TA07 2H093 NA33 NC90 ND08 ND15 ND52 NE03 5C006 AC28 AF44 BB18 FA36 FA54 5C080 AA10 BB05 CC06 CC10 DD10 EE32 FF07 JJ01 JJ02 JJ03 JJ04 JJ06

Claims (8)

[Claims] 1. A plasma addressed liquid crystal display device comprising: a plurality of signal electrodes arranged in parallel in a predetermined direction; and a plurality of discharge electrode pairs arranged in parallel in a direction crossing the signal electrodes. Each of the plurality of signal electrodes is divided into a first signal electrode and a second signal electrode by a central virtual dividing line on the display screen, and the plurality of discharge electrode pairs are divided by a central virtual dividing line on the display screen. Divided into a first discharge electrode pair group and a second discharge electrode pair group. The first signal electrode group, the first discharge electrode pair group, and the second signal electrode group and the second discharge electrode pair group A plasma address display device having display driving means for independently performing frame inversion driving for each display screen area divided by a central virtual dividing line on the display screen. 2. The image display device according to claim 1, wherein the display driving unit includes a first signal circuit for applying an image signal to the first signal electrode group, a second signal circuit for applying an image signal to the second signal electrode group, and the first signal circuit.
A first scanning circuit for sequentially driving a discharge electrode pair group;
A second scanning circuit for sequentially driving the discharge electrode pair group, the first scanning circuit corresponding to one side of a central virtual dividing line on the display screen.
The display driving of the signal electrode group and the first discharge electrode pair group is performed, and the display driving of the second signal electrode group and the second discharge electrode pair group corresponding to the other side of the central virtual dividing line on the display screen is performed. 2. The plasma addressed display device according to claim 1, wherein two-frame one-inversion driving is performed symmetrically with respect to a central virtual dividing line on the display screen. 3. The plasma addressed liquid crystal display device according to claim 2, wherein the first scanning circuit and the second scanning circuit scan so as to sequentially drive from a discharge electrode pair near the central virtual dividing line. 4. A shield wall for providing a discharge space by the discharge electrode pair is provided, and the central virtual dividing line is located on either the shield wall or the discharge electrode. Item 4. A plasma addressed liquid crystal display device according to any one of Items 1 to 3. 5. The plasma addressed liquid crystal display according to claim 1, wherein the central virtual dividing line on the display screen is a virtual line indicating a dividing position at which the display screen is vertically divided into two parts. apparatus. 6. A method for driving a plasma addressed liquid crystal display device according to claim 1, wherein each of the display screen regions is divided independently by a central virtual dividing line on the display screen. A method for driving a plasma addressed liquid crystal display device that performs frame inversion driving. 7. The driving method of a plasma addressed liquid crystal display device according to claim 6, wherein said frame inversion driving inverts the polarity every plural frame periods. 8. The driving method of a plasma addressed liquid crystal display device according to claim 7, wherein the non-discharge period is at least half of the frame period.