JP2001134236A - Plasma address display device and driving method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve such problem that, since there is a tendency that discharging electric charges needed for wirite-in becomes insufficient in an AC drive, the sufficient write-in of a picture signal to a pixel is impossible and the pictures are to be made to have high quality. SOLUTION: In a flat panel 0 which is to be used in a plasma address display device, display cells which are provided with signal electrodes Ys arranged in columns and plasma cells which are provided with discharge channels 5 which are arranged in rows and whose each channel has, for example, two lines of electrodes (for example, X1, X2) are laminated and pixels 11 are provided at intersection parts of respective signal electrodes Ys and the discharge channels 5. A scanning circuit 22 selects pixels 11 for every row by discharging successively row discharge channels 5 in rows for every prescribed cycle and for every row. A signal circuit 21 writes a picture signal to pixels 11 of the selected row by supplying continuously the picture signal to the signal electrodes Ys in column in accordance with the prescribed cycle. The circuit 22 stabilizes the writing of the picture signal to the pixels 11 by repeating the plasma discharge at least four times for every discharge channel 5. Then, the smallness of discharging electric charges to be generated in one time is covered by making the number of times of the plasma discharge per one line of the discharge channel to be four times or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma addressed display device in which a display cell and a plasma cell are overlapped. More specifically, the present invention relates to a driving technique of an AC type plasma cell.

[0002]

2. Description of the Related Art An AC drive type plasma addressed display device is disclosed, for example, in Japanese Patent Application Laid-Open No. 8-304792, and FIG. The plasma addressed display device has a flat panel structure including a display cell 1 and a plasma cell 2 and a common intermediate sheet 3 interposed therebetween. The intermediate sheet 3 is made of an extremely thin plate glass or the like and is called a micro sheet. The plasma cell 2 is composed of a lower glass substrate 4 bonded to the intermediate sheet 3, and a gas that can be discharged is sealed in a gap between the two. On the inner surface of the lower glass substrate 4, stripe-shaped discharge electrodes X1 and X2 are formed. In the case of the AC drive type, these discharge electrodes X1 and X2 are covered with an insulating film 6. A partition 7 is formed to divide these electrodes into pairs as (X1, X2), and a discharge channel 5 is formed by dividing a gap filled with a dischargeable gas. In the discharge channel 5 surrounded by the pair of partition walls 7, the electrodes X1 and X2
, An AC plasma discharge is generated.

On the other hand, the display cell 1 is configured using a transparent upper glass substrate 8. The glass substrate 8 is bonded to the other surface of the intermediate sheet 3 with a sealing material or the like via a predetermined gap, and a liquid crystal 9 is sealed in the gap as an electro-optical material. A signal electrode Y is formed on the inner surface of the upper glass substrate 8. Matrix pixels are formed at the intersections of the signal electrodes Y and the discharge channels 5.
A color filter 13 is also provided on the inner surface of the glass substrate 8, and for example, three primary colors of RGB are assigned to each pixel.
The flat panel having such a configuration is of a transmission type, for example, in which the plasma cell 2 is located on the incident side and the display cell 1 is located on the emitting side. A backlight 12 serving as a light source is attached to the plasma cell 2 side.

In the plasma addressed display device having such a configuration, a row-shaped discharge channel 5 in which plasma discharge is performed is switched in a line-sequential manner and scanned, and an image is applied to a column-shaped signal electrode Y on the display cell 1 side in synchronization with the scanning. Display driving is performed by applying a signal. Discharge channel 5
When an AC plasma discharge occurs inside, the inside becomes almost uniformly at the anode potential, and pixel selection for each row is performed. That is, one discharge channel 5 corresponds to one scanning line and functions as a sampling switch. When an image signal (signal voltage) is applied to each signal electrode in a state where the plasma sampling switch is turned on, sampling is performed and lighting or extinguishing of the pixel can be controlled. Even after the plasma sampling switch is turned off, the image signal is held in the pixel as it is. The display cell 1 performs image display by modulating incident light from the backlight 12 into outgoing light in accordance with an image signal. Since the liquid crystal 9 is AC driven, the polarity of the image signal is inverted, for example, every frame. Or,
The polarity may be inverted for each row.

The difference between the AC plasma discharge type and the DC plasma discharge type is that at least one of a pair of discharge electrodes X 1 and X 2 assigned to each discharge channel 5 is covered with an insulating film (dielectric) 6. It is. A discharge pulse is sequentially applied to a pair of discharge electrodes X1 and X2 assigned to each discharge channel 5, and an AC plasma discharge is excited by utilizing the dielectric property of the insulating film 6, thereby performing a line-sequential scan of the plasma cell 2. The plasma discharge excited in each discharge channel 5 stops when the insulating film 6 is charged with the charged particles. AC
The plasma discharge can be controlled autonomously by charging / discharging the dielectric, and the amount of discharge charge is smaller than that of the DC plasma discharge, and the deterioration of the plasma cell 2 is suppressed accordingly.

Referring to FIG. 14, the AC plasma discharge operation of the plasma addressed display device shown in FIG. 13 will be specifically described. (1) shows the voltage waveform of the selection pulse applied to one discharge electrode X1. This voltage waveform changes, for example, from the reference potential (ground potential) by −300 V to −600 V at time TF, and returns to the reference potential at time TR. T
The pulse width between F and TR is, for example, about 10 μs. The other discharge electrode X2 is grounded. (2) shows the waveform of the discharge current flowing through the discharge channel 5 in response to the selection pulse. The first discharge occurs almost in synchronization with the fall of the selection pulse in the TF, and the discharge current P1
Flows. Since the discharge current P1 stops flowing when the capacitance of the insulating film 6 on X1 is charged, the discharge charge can be suppressed autonomously. Subsequently, a second discharge occurs substantially in synchronization with the rise of the selection pulse in TR, and a discharge current P2 flows. This discharge current P2 is
Since the electric charge stops flowing when the electric charge that has been charged is discharged, the plasma discharge can be controlled autonomously in the same manner. (3)
Indicates the surface potential of the insulating film 6 which changes in response to the selection pulse applied to the discharge electrode X1. When the first discharge current P1 flows substantially in accordance with TF, the insulating film 6 is charged, so that its surface potential returns from the negative side to the reference potential. Thereafter, the selection pulse returns to the reference potential by TR, and accordingly, the surface potential of the insulating film 6 rises and largely swings to the positive side. As a result, a discharge in the opposite direction occurs between the adjacent grounded discharge electrode X2 and a discharge current P2 flows. The charge charged in the insulating film 6 is discharged by the discharge current P2, and the surface potential of the insulating film 6 shown in (3) returns to the reference potential (ground potential). As is clear from the above description, A
In the C plasma discharge type, plasma discharge occurs twice in both directions by utilizing the capacitance of the insulating film 6. (4) shows the waveform of the image signal applied to the signal electrode Y in synchronization with the selection pulse. As is clear from the figure, the data (signal voltage) of the image signal is written to the corresponding pixel when the second discharge is completed.

[0007]

In the DC drive type, the discharge current continues to flow in the discharge channel while the selection pulse is applied, whereas in the AC drive type, the charge / discharge of the dielectric covering the electrode is used. Therefore, the discharge current only flows instantaneously at the rise and fall of the pulse. Because of this,
While the AC drive type can suppress the discharge current autonomously, it has a disadvantage that the amount of charges generated in the discharge channel is limited. As described above, in the plasma address display device, an image is displayed by using the charge generated in the discharge channel by the plasma discharge for writing to the display cell. Unlike the DC drive, the AC drive tends to lack this discharge charge required for writing. Therefore, FIG.
In the conventional simple driving method described in (1), image signals cannot be sufficiently written to pixels, which hinders improvement in image quality. For example, discharge charges are sparsely and densely formed in a pixel and disappear before they are sufficiently relaxed. For this reason, potential non-uniformity (offset) occurs in the pixel, which appears as display unevenness. In addition, non-uniform display unevenness in a pixel may be different for each frame. This is particularly apparent when displaying halftones. In addition, when the voltage level of the image signal is relatively low in a halftone display or the like, the writing rate of the image signal to the pixel decreases.

[0008]

Means for Solving the Problems In order to solve the above-mentioned problems of the prior art, the following measures have been taken. That is, the present invention
A flat panel in which display cells having column-shaped signal electrodes and plasma cells having discharge channels arranged in rows and having electrodes are stacked, and pixels are provided at intersections of each signal electrode and each discharge channel; A scanning circuit that sequentially discharges the row-shaped discharge channels at predetermined intervals to select pixels for each row, and supplies an image signal to a column-shaped signal electrode sequentially according to a predetermined cycle to apply a pixel to the selected row. In the plasma addressed display device having the signal circuit for writing the image signal, the scanning circuit stabilizes the writing of the image signal to the pixel by repeating the plasma discharge at least four times for each discharge channel. In one embodiment, the scanning circuit repeats the plasma discharge every one cycle. In another aspect, the scanning circuit repeats the plasma discharge every other cycle. In one embodiment, the scanning circuit holds one electrode included in each discharge channel at a ground potential, applies a pulse to the other electrode, and generates two plasma discharges at the rising and falling edges, Pulse application is repeated at least twice for each discharge channel. In another aspect, the scanning circuit holds one electrode included in each discharge channel at a ground potential and applies a pulse to the other electrode to generate one plasma discharge, and then grounds the other electrode. While maintaining the potential, a pulse is applied to one of the electrodes to generate a second plasma discharge, and the application of the pulse is continuously performed at least four times.

According to the present invention, in an AC-driven plasma addressed display device, the number of plasma discharges per discharge channel is set to four or more, thereby compensating for a small amount of discharge charges generated at one time. Thus, the writing rate of the image signal to the display cell can be improved, and the image quality can be improved.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a basic configuration of a plasma addressed display device according to the present invention.
As shown, the plasma address display device basically has
Panel 0, signal circuit 21, scanning circuit 22, and control circuit 23
Consists of Panel 0 includes column-shaped signal electrodes Y1 to Ym.
And a plasma cell having the row-shaped discharge channels 5 are stacked, and the pixel 11 is defined at the intersection of each of the signal electrodes Y1 to Ym and each of the discharge channels 5. Each discharge channel 5 has, for example, two electrodes. A pair of electrodes X1 and X2 are assigned to the first discharge channel 5,
A pair of electrodes X3 and X4 are assigned to the second discharge channel 5, and a pair of electrodes Xn-
1, Xn are assigned. The scanning circuit 22 sequentially discharges the row-shaped discharge channels 5 at a predetermined cycle (for example, a horizontal cycle in a video signal), and selects a pixel for each row. The signal circuit 21 supplies an image signal to the signal electrodes Y1 to Ym sequentially in a column in accordance with a predetermined cycle, and writes the image signal to the pixels 11 in the selected row. The control circuit 23 controls the synchronization between the scanning circuit 22 and the signal circuit 21.

As a characteristic feature, the scanning circuit 22 repeats the plasma discharge at least four times for each discharge channel 5 to stabilize, uniformize, and improve the writing of the image signal to the pixel 11. Specifically, the scanning circuit 22
The plasma discharge is repeated every cycle. One horizontal cycle (1
In the case of repeating every H), it may be hereinafter referred to as “discharge every 1H”. Alternatively, the scanning circuit 22 may repeat the plasma discharge every other cycle. When this is repeated every other horizontal cycle, it may be hereinafter referred to as “discharge every 2H”. As described above, when liquid crystal is used as the electro-optical material on the display cell side, AC driving is generally performed. In this case, the polarity of the image signal applied to the liquid crystal is inverted every horizontal cycle. If "discharge every 2H" is executed in accordance with this, it becomes possible to write image signals of the same polarity to the liquid crystal in one frame, which is more efficient. The scanning circuit 22 holds one electrode (for example, X1) included in each discharge channel 5 at the ground potential, applies a pulse to the other electrode (for example, X2), and performs two discharges at the rise and fall. Generate. (Less than,
This driving method may be referred to as “one-electrode driving”). In this case, the scanning circuit 22 generates a total of four plasma discharges by repeating the application of the pulse to each discharge channel 5 at least twice. Or scanning circuit 2
2 is to hold one electrode (for example, X1) included in each discharge channel 5 at the ground potential and apply a pulse to the other electrode (for example, X2) to generate a first plasma discharge, and then to generate the other plasma discharge X2 is held at the ground potential and one electrode X1
To generate a second plasma discharge (hereinafter, this method may be referred to as “two-electrode drive”). In this case, the scanning circuit 22 generates the plasma discharge four times by continuously applying the pulse at least four times (ie, performing the two-electrode driving twice). As described above, the present invention generates a plasma discharge at least four times by applying a plurality of pulses. Hereinafter, in this specification, this may be referred to as “multi-pulse driving”.

FIG. 2 is a schematic diagram showing a first embodiment of the multi-pulse drive, in which "one electrode drive" and "discharge at every 1H".
Represents the case of. The panels used for this drive include discharge channels 51, 52, 53, 54, 55,.
・ ・Each discharge channel is divided by a partition wall 7 and has two electrodes covered with an insulating film 6. For example, the discharge channel 51 has a pair of electrodes X1 and X2.
Contains. The discharge channel 55 has a pair of electrodes X9, X
10 is included. First, at the first discharge timing PL1, a pulse of negative polarity with respect to the ground potential (GND) is applied to X2, X4, and X6. Thereby, the discharge channel 51
, Two plasma discharges occur between X1 and X2.
This is represented by two arrows. Similarly, two plasma discharges occur in discharge channel 52 between X3 and X4. Further, two plasma discharges occur between X5 and X6 in the discharge channel 53. After one horizontal cycle, a pulse is applied to X4, X6, and X8 at the next discharge timing PL2. As a result, two plasma discharges are generated in the discharge channels 52, 53, and 54, respectively. At the next discharge timing PL3, a pulse is applied to the electrodes X6, X8, and X10. At this time, X5, X7 and X9 of the other party are grounded. As a result, the discharge channels 53, 54,
As shown by arrows at 55, two plasma discharges are generated. When this is viewed in chronological order, for example, focusing on the discharge channel 53, the pulses are PL1, PL2 and PL
3 is applied three times to generate a total of six plasma discharges. During this time, an image signal whose polarity is inverted every horizontal cycle is applied to each signal electrode as represented by a waveform LC. This image signal is written to the pixels in the corresponding row by repeating the six plasma discharges. The image signal written by the final plasma discharge is held until the next frame.

FIG. 3 is a graph showing the relationship between the applied voltage and the transmittance of a display cell driven according to the present invention. In this example, a normally white liquid crystal cell is used as a display cell. When the transmittance is 100% when the applied voltage is 0 V, the transmittance is reduced to about 1% when the applied voltage is about 80 V, and black display is performed. Becomes In practice, the applied voltage is applied to the liquid crystal via an intermediate sheet separating the display cell and the plasma cell. The curve indicated by A in the graph represents the transmittance / voltage characteristics in the case of the DC drive type. On the other hand, a curve B represents a transmittance / voltage characteristic when a single pulse is applied to each discharge channel by AC driving as in the related art. Curve C is a transmittance / voltage characteristic when “multi-pulse driving” is performed by applying five pulses to each discharge channel by AC driving according to the present invention. As is clear from the graph, by performing the "multi-pulse drive", the writing of the signal voltage at the halftone level is particularly improved, and the contrast is greatly improved. That is, the transmittance / voltage characteristic curve is located at the lower left side of C compared to B, which means that the writing rate of the image signal is improved accordingly.

FIG. 4 is an enlarged view of the screen when "single pulse drive" is performed as in the prior art.
It can be observed that the brightness in each pixel is uneven near the partition separating each row of pixels. On the other hand, FIG. 5 shows a display screen when “multi-pulse driving” is performed, and the unevenness in the pixel has disappeared.

FIG. 6 is a schematic diagram showing a second embodiment of "multi-pulse drive", in which "one-electrode drive" and "discharge every 2H" are performed. The parts corresponding to those of the first embodiment shown in FIG. 2 are denoted by the corresponding reference numerals to facilitate understanding. First, the first drive timing PL1
To apply a pulse to X2 and X6 to generate two plasma discharges in discharge channels 51 and 53, respectively.
It should be noted that X1 paired with X2 and X5 paired with X6 are grounded. All other electrodes to which no pulse is applied are also grounded. At the next drive timing PL2, X4
And X8, the discharge channels 52 and 5
In FIG. 4, two plasma discharges are generated. At the next drive timing PL3, a pulse is applied to X6 and X10, and two plasma discharges occur in the discharge channels 53 and 55, respectively. When the above scanning is viewed in chronological order, for example, when attention is paid to the discharge channel 53, two plasma discharges occur in PL1, and the negative image signal LC
In the same manner, two plasma discharges are generated at the drive timing PL3 at 1H, and the negative polarity image signal LC is written. As described above, by adopting the “discharge every 2H”, it becomes possible to write the image signals LC of the same polarity, and it is possible to further improve the efficiency.

The above is the embodiment of "one-electrode drive", but the "multi-pulse drive" of the present invention is also applicable to "two-electrode drive". Before describing these embodiments, the basic operation of "two-electrode drive" will be described first with reference to FIG. As shown, 1 is applied to the signal electrode Y.
An image signal is applied for each H. Here, 1H is 32 μs
And the data length of the image signal is 28 μs. Even-numbered electrodes X2, X4,... Included in each discharge channel
For example, a negative pulse of, for example, 275 V is applied simultaneously to each horizontal period. Also, a pulse of a negative polarity is sequentially applied to the odd-numbered electrodes X1, X3,... Included in each discharge channel every one horizontal cycle. First, at timing X1
The first applied plasma discharge is caused by the falling of the pulse applied to. Then, X1 covered with an insulating film
Surface potential gradually returns to GND due to the charging of the electric charge generated by the plasma. An image signal is applied to the signal electrode Y at this intermediate timing. After this, X
The pulse applied to 1 returns to GND. At the same time, the surface potential of X1 sharply increases. However, since the potential difference with X2 is set lower than the discharge starting voltage, no plasma discharge occurs. Following this, the pulse applied to the partner electrode X2 falls at the timing. At this time, a large potential difference is generated between X1 and X2, and a second plasma discharge is generated as indicated by an asterisk. Thereby, the image signal is written to the pixel. Thereafter, the pulse applied to X2 returns to GND at the timing. X1
Is stabilized toward a predetermined level. Thereafter, the application of the image signal is stopped at the timing. The above operation is performed on the next pair of electrodes X3 and X4 in the next horizontal cycle. In this two-electrode drive, two plasma discharges are generated by applying two pulses per one horizontal cycle. Hereinafter, in this specification, two-electrode driving in which two pulses are applied within one horizontal period (1H) may be referred to as “1H driving”. On the other hand, the case where two pulses are applied over a plurality of horizontal periods may be referred to as “1H outside drive”.

FIG. 8 is a schematic diagram showing a third embodiment of the "multi-pulse drive", in which parts corresponding to those of the previous embodiment are denoted by corresponding reference numerals for easy understanding. The present embodiment is a case in which "two-electrode driving" employs "driving within 1H" and "discharge every 1H". At timing PL1,
A pulse is continuously applied to the electrodes X1 and X2 of the discharge channel 51 to generate two plasma discharges as indicated by arrows. At this time, electrodes X3 and
A pulse is applied following X4 to generate two plasma discharges as indicated by arrows. Next drive timing PL
2, a pulse is continuously applied to the electrodes X3 and X4 of the discharge channel 52, and at the same time, the electrodes X5 and
A pulse is continuously applied to X6. Looking at this operation in chronological order, for example, when attention is paid to the discharge channel 52, two plasma discharges occur in PL1 and two more plasma discharges occur in PL2. Therefore, also in this embodiment, the image signal LC is written by four plasma discharges.

FIG. 9 is a schematic diagram showing a fourth embodiment of the "multi-pulse drive". Parts corresponding to those of the previous embodiment are denoted by corresponding reference numerals for easy understanding. In the present embodiment, “two-electrode driving” and “1H internal driving” are employed and “discharge every 2H” is performed. At the drive timing PL1, two plasma discharges are generated in the discharge channels 51 and 53, respectively. At the next drive timing PL2, two plasma discharges are generated in the discharge channels 52 and 54, respectively. Similarly, two plasma discharges are generated in the channels 53 and 55 in PL3 in the same manner, and PL4
, Two plasma discharges are generated in the channels 54 and 56, respectively. Looking at this in a time series, for example, when attention is paid to the discharge channel 53, two plasma discharges are generated in PL1 and then two plasma discharges are generated in PL3 in one horizontal cycle. Therefore, the image signal LC is written to the corresponding pixel by a total of four plasma discharges.

FIG. 10 shows a fifth embodiment of the "multi-pulse drive". Parts corresponding to those of the previous embodiment are denoted by corresponding reference numerals for easy understanding. The present embodiment is a case in which “two-electrode drive” employs “1H outside drive” and “discharge every 1H” is performed. The panel is different from the other embodiments in that the electrodes X1 and X
2, X3, X4, X5, X6, and X7 are shared by adjacent discharge channels. For example, the electrode X1 is shared by the discharge channels 51 and 52, respectively. First, at timing PL1, pulses are applied to X1, X3, and X5, and a single plasma discharge is generated in discharge channels 51, 52, 53, 54, 55, and 56, respectively, as indicated by arrows. Next, PL2
, A pulse is applied to X2, X4, and X6, and a single plasma discharge is generated in each of the discharge channels 52, 53, 54, 55, 56, and 57. Hereinafter, similar driving is repeated at timings PL3, PL4, PL5, PL6,.
Looking at these driving in time series, for example, when attention is paid to the discharge channel 56, a total of six pulses are applied from PL1 to PL6, and six plasma discharges are generated.

FIG. 11 is a timing chart showing a sixth embodiment of the "multi-pulse drive". Parts corresponding to those of the previous embodiment are denoted by corresponding reference numerals for easy understanding. The present embodiment is a case in which “two-electrode drive” and “outside 1H drive” are performed and “discharge every 2H” is adopted.
The electrodes formed in the plasma cell are connected in common every third electrode. For example, X2 and X5 are commonly connected, X3 and X0 are commonly connected, and X4 and X7 are commonly connected. First, a pulse is applied to the electrode X2 of the discharge channel 51 and the electrode X10 of the discharge channel 55 at timing PL1. As a result, a plasma discharge is generated once in each of the discharge channel 51, the discharge channel 53, the discharge channel 55, and the discharge channel 57 as indicated by arrows. Next, at timing PL2, the electrodes X4 and X1
2 is applied with a pulse. As a result, a plasma discharge is generated in each of the discharge channels 52, 54, 56 and 58 as indicated by arrows. Hereinafter, the same scanning is repeated at timings PL3, PL4, PL5, PL6, PL7,. Looking at this in chronological order, for example, when focusing on the discharge channel 57, PL1, PL3, PL
At 5 and PL7, a plasma discharge was generated every 2H, and the plasma discharge was performed four times in total.

FIG. 12 is a schematic diagram in which the first to sixth embodiments described above are classified according to operation modes. As shown in the figure, “multi-pulse driving” is divided into “one-electrode driving” and “two-electrode driving”. The "one-electrode drive" is a method of performing AC drive by driving only one electrode in each discharge channel positively or negatively and driving the other electrode to the ground level. In the first embodiment, the case where "discharge every 1H" is performed in "one electrode drive" is described as "discharge every 2H".
Is the second embodiment. On the other hand, “two-electrode driving” is a method of discharging by driving both a pair of electrodes included in one discharge channel positively or negatively. As described above, the "two-electrode driving" performs the "two-electrode driving" for driving both electrodes within one horizontal period (selection period of one line) and the "two-electrode driving" between pulses exceeding 1H. There is “1H outside drive”. In all of these cases, "discharge every 1H" and "discharge every 2H" are possible, which correspond to the third to sixth embodiments, respectively. Since the polarity of the liquid crystal drive in the plasma address display device is inverted for each line, when "discharge every 2H" is performed, writing can be performed with the same polarity, thereby increasing the efficiency.

[0022]

As described above, according to the present invention,
In an AC drive type plasma addressed display device, "multi-pulse drive" in which at least four discharges are repeated for each discharge channel is performed to stabilize, uniformize, and improve the writing of image signals to pixels. Thereby, high image quality and high contrast can be achieved. Further, when the same contrast as in the related art is obtained, the voltage of the image signal can be reduced. This allows
Crosstalk and the like can be suppressed. Further, when the same luminance as that of the related art is obtained, the power consumption of the backlight can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a basic configuration of a plasma addressed display device according to the present invention.

FIG. 2 is a schematic view showing a first embodiment of a driving method of the plasma addressed display device according to the present invention.

FIG. 3 is a graph showing a voltage / transmittance characteristic of the plasma addressed display device according to the present invention.

FIG. 4 is an enlarged view of a display surface showing a display state of a conventional plasma addressed display device.

FIG. 5 is an enlarged view showing a display surface of the plasma addressed display device according to the present invention.

FIG. 6 is a schematic view showing a second embodiment of the driving method of the plasma addressed display device according to the present invention.

FIG. 7 is a reference diagram showing a driving method of the plasma addressed display device.

FIG. 8 is a schematic view showing a third embodiment of the driving method of the plasma addressed display device according to the present invention.

FIG. 9 is a schematic view showing a fourth embodiment of the driving method of the plasma addressed display device according to the present invention.

FIG. 10 is a schematic diagram showing a fifth embodiment of the driving method of the plasma addressed display device according to the present invention.

FIG. 11 is a schematic view showing a sixth embodiment of the driving method of the plasma addressed display device according to the present invention.

FIG. 12 is a schematic diagram in which various driving methods according to the present invention are classified.

FIG. 13 is a sectional view showing an example of a conventional plasma addressed display device.

FIG. 14 is a waveform chart for explaining the operation of the conventional plasma addressed display device shown in FIG.

[Explanation of symbols]

0 ... panel, 1 ... display cell, 2 ... plasma cell, 5 ... discharge channel, 6 ... insulating film, 7 ...
-Partition wall, 9-Liquid crystal, 11-Pixel, 12-Backlight, 21-Signal circuit, 22-Scanning circuit, X-Discharge electrode, Y-Signal electrode

Claims (10)

[Claims] 1. A display cell having column-shaped signal electrodes and a plasma cell having discharge channels arranged in rows and having electrodes are stacked, and pixels are provided at intersections of each signal electrode and each discharge channel. A flat panel, a scanning circuit that applies a pulse to the electrodes and discharges a discharge channel at a predetermined cycle to select pixels for each row, and sequentially applies image signals to signal electrodes in a column in accordance with a predetermined cycle. And a signal circuit for writing the image signal to the pixels in the selected row, wherein the scanning circuit repeats the plasma discharge at least four times for each discharge channel to write the image signal to the pixels. A plasma addressed display device characterized by being stabilized. 2. The plasma addressed display device according to claim 1, wherein the scanning circuit repeats the plasma discharge every one cycle. 3. The plasma addressed display device according to claim 1, wherein the scanning circuit repeats the plasma discharge every other cycle. 4. The scanning circuit holds one electrode included in each discharge channel at a ground potential, applies a pulse to the other electrode, and generates two plasma discharges at rising and falling edges. 2. The plasma addressed display device according to claim 1, wherein the application of the pulse is repeated at least twice for each discharge channel. 5. The scanning circuit holds one electrode included in each discharge channel at a ground potential and applies a pulse to the other electrode to generate one plasma discharge, and then connects the other electrode to a ground. 2. The plasma addressed display device according to claim 1, wherein a second plasma discharge is generated by maintaining a potential and applying a pulse to one of the electrodes, and the application of the pulse is performed at least four times. 6. A display cell having column-shaped signal electrodes and a plasma cell having discharge channels arranged in rows and having electrodes are stacked, and a pixel is provided at an intersection of each signal electrode and each discharge channel. A scanning procedure of applying a pulse to the electrodes to discharge the discharge channel at a predetermined cycle to select pixels for each row, and sequentially applying a pulse to the electrodes at predetermined cycles, and sequentially applying an image to the signal electrodes in a column in a predetermined cycle. A driving procedure of a plasma addressed display device for supplying a signal and writing the image signal to a pixel in a selected row, the scanning procedure comprising: repeating a plasma discharge at least four times for each discharge channel; A method of driving a plasma addressed display device, which stabilizes writing of an image signal to a display. 7. The driving method for a plasma addressed display device according to claim 6, wherein in the scanning procedure, a plasma discharge is repeated every cycle. 8. The driving method for a plasma addressed display device according to claim 6, wherein said scanning procedure repeats plasma discharge every other cycle. 9. The scanning procedure comprises: maintaining one electrode included in each discharge channel at a ground potential, applying a pulse to the other electrode, and generating two plasma discharges at rising and falling edges. 7. The method according to claim 6, wherein the application of the pulse is repeated at least twice for each discharge channel. 10. The scanning procedure is such that one electrode included in each discharge channel is maintained at a ground potential and a pulse is applied to the other electrode to generate one plasma discharge, and then the other electrode is grounded. 7. The method according to claim 6, wherein a second plasma discharge is generated by applying a pulse to one of the electrodes while maintaining the potential, and the application of the pulse is performed at least four times continuously. .