KR20080004198A - Plasma display and driving method thereof - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to execute stable sustain discharge by adjusting the width and magnitude of sustain pulses supplied to scan and sustain electrodes during a sustain period. A plasma display device includes first and second electrodes(X1-Xn,YG1-YG2), and third electrodes(A1-Am) to cross with the first and second electrodes. The first electrodes are divided into plural groups having first and second groups. At least one sub-fields include address and sustain periods corresponding to the groups. During a first sustain period(S11) between the first and second address periods, a first voltage difference is generated between the first and second electrodes during a first interval. A second voltage difference smaller than the first voltage difference is generated between the first and second electrodes during a second interval.

Description

Plasma display device and driving method thereof {PLASMA DISPLAY AND DRIVING METHOD THEREOF}

1 is a diagram illustrating a gray scale expression method of a conventional plasma display device.

2 is a schematic conceptual diagram of a plasma display device according to an exemplary embodiment of the present invention.

3 is a diagram for describing a method of driving a plasma display device according to an exemplary embodiment of the present invention.

4 is a diagram illustrating an example in which scan electrodes of a plasma display device according to an exemplary embodiment of the present invention are divided into four groups.

5 is a view showing a driving waveform of the plasma display device according to the first embodiment of the present invention.

6 illustrates a driving waveform of the plasma display device according to the second embodiment of the present invention.

The present invention relates to a plasma display device and a driving method thereof.

A plasma display device is a flat display device that displays characters or images by using plasma generated by gas discharge. In the display panel, tens to millions or more of discharge cells are arranged in a matrix form according to their size.

In general, a plasma display device divides one frame into a plurality of subfields having respective weights, and time-division controls them to implement gray levels. Each subfield includes a reset period, an address period, and a sustain period. In this case, the reset period is a period for initializing the state of each cell in order to perform an address operation smoothly on the cell, and the address period is a period for selecting a cell to be turned on from a plurality of cells through address discharge. In addition, the sustain period is a period for sustain discharge of the cell to be turned on.

1 is a diagram illustrating a gray scale expression method of a conventional plasma display device.

As shown in FIG. 1, in the gray scale display method of the conventional plasma display device, the address operation (Ad period) is sequentially completed from the first scan electrode line Y1 to the last scan electrode line Yn, and then the sustain period S is obtained. In the period), all the cells selected as the cells to emit light are simultaneously discharged.

According to the driving method as described above, the cell corresponding to the scan electrode in which the address operation occurs in the first half does not perform the sustain discharge operation until the address operation is performed over all the scan electrode lines. Therefore, in the cell in which the address operation is performed in the first half, a significant time gap may occur until the sustain discharge operation occurs, so that the wall charge may be relatively lost, which may cause the sustain discharge to become unstable later. In addition, in the case of the cell corresponding to the scan electrode in which the address operation occurs in the second half, the address operation occurs later than the cell in which the address operation is performed in the first half, and the wall charge between the scan electrode and the address electrode formed after the reset period is discharged. It may be lost to space. Therefore, there is a problem that an unstable address operation is performed toward the last scan electrode line Yn, so that low discharge may occur during sustain discharge.

Accordingly, an object of the present invention is to provide a plasma display device and a driving method thereof for performing stable sustain discharge.

According to an aspect of the present invention for achieving the above object, a plurality of first electrodes and a plurality of second electrodes and a plurality of third electrodes formed in a direction crossing the plurality of first and second electrodes A method of driving a plasma display device is provided. In this driving method, the plurality of first electrodes are divided into a plurality of groups including at least a first group and a second group, and a plurality of address periods and a plurality of addresses respectively corresponding to each group of the plurality of first electrodes. In at least one subfield including a sustain period, in a first sustain period located between an address period of the first group and an address period of the second group of the plurality of sustain periods, the plurality of Generating a first voltage difference between a first electrode and the plurality of second electrodes and a second voltage difference that is less than the first voltage difference between the plurality of first electrodes and the plurality of second electrodes during a second period of time. Generating a step.

According to another feature of the present invention, a plasma display device is provided. The plasma display device includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the plurality of first electrodes and the plurality of second electrodes. The first electrode generates a plasma display panel divided into a plurality of groups including at least a first group and a second group, a control signal for driving the plasma display panel, divides one frame into a plurality of subfields, And a control unit for allocating a plurality of address periods and sustain periods corresponding to each group of the plurality of first electrodes in at least one subfield of the plurality of subfields, and a driving unit for driving the plasma display panel. In this case, the driving unit applies a first voltage to the plurality of first electrodes in a first sustain period between the address period of the first group and the address period of the second group, and the first voltage is applied. Applying a second voltage lower than the first voltage to the plurality of second electrodes in a first period of a portion of a period, and applying the second voltage to the plurality of second electrodes in a second period of a portion of the period where the first voltage is applied. The third voltage higher than the second voltage is applied.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, the wall charge referred to in the present invention refers to a charge that is formed in the wall of the discharge cell (eg, the dielectric layer) close to each electrode and accumulates in the electrode. This wall charge is not actually in contact with the electrode itself, but here the wall charge is described as "formed", "accumulated" or "stacked" on the electrode. In addition, a wall voltage refers to the potential difference formed in the wall of a discharge cell by wall charge.

First, a plasma display device according to an exemplary embodiment of the present invention will be described with reference to FIG. 2. 2 is a schematic conceptual diagram of a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address driver 300, a scan electrode driver 400, and a sustain electrode driver 500. Include.

The plasma display panel 100 includes a plurality of address electrodes A1-Am extending in the column direction, a plurality of sustain electrodes X1-Xn extending in the row direction, and a plurality of scan electrodes Y1-Yn. The plurality of scan electrodes Y1-Yn and the sustain electrodes X1-Xn are arranged in pairs with each other. The discharge cells are formed by the adjacent scan electrodes, the sustain electrodes, and the address electrodes crossing them.

The controller 200 receives an image signal from the outside and outputs an address electrode driving control signal, a sustain electrode driving control signal, and a scan electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields, and each subfield includes a reset period, an address period, and a sustain period when expressed as a temporal change in operation. In an embodiment of the present invention, the control unit 200 includes the plurality of scan electrodes Y1-Yn in a plurality of groups in order to improve a low discharge problem that may have been generated due to wall charges previously lost during an address period. The operation is divided so that sustain discharge is provided between the address periods of each of the plurality of scan electrode groups so as to cause sustain discharge. In addition, the control unit 200 outputs a control signal for adjusting the sustain discharge pulse width in the sustain period located between the address periods of each of the plurality of scan electrode groups.

The address electrode driver 300 receives an address electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode.

The scan electrode driver 400 receives a scan electrode driving control signal from the controller 200 and applies a driving voltage to the scan electrode.

The sustain electrode driver 500 receives the sustain electrode driving control signal from the controller 200 and applies a driving voltage to the sustain electrode.

Next, a driving method of the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 to 4.

3 is a diagram for describing a method of driving a plasma display device according to an exemplary embodiment of the present invention. As shown in FIG. 3, the plasma display device divides the scan electrode lines into a plurality of groups, drives one frame into a plurality of subfields for each group, and each group is driven by a combination of eight subfields. Gradation is expressed.

In this case, in the method of dividing the scan electrode lines into a plurality of groups, groups may be formed by grouping a predetermined number in the physical arrangement order of the scan electrode lines. For example, when the panel is formed of 800 scan electrode lines, the first to 100th scan electrode lines may be set as the first group and the 101 to 200th scan electrode lines may be set as the second group while being divided into eight groups. However, in grouping the scan electrode lines, adjacent neighboring lines may not be collected, but scan electrode lines spaced apart from each other may be collected in the same group. That is, the first, 9, 17, ... (8k + 1) th scan electrode lines are allocated to the first group, and the second, 10, 18, ... (8k + 2) th scan is allocated to the second group. Allocating electrode lines. On the other hand, if necessary, it is possible to group the scan electrode lines even in an irregular manner.

4 is a diagram illustrating an example in which scan electrodes of a plasma display device according to an exemplary embodiment of the present invention are divided into four groups. Here, one subfield is composed of a reset period R, an address / sustain mixing period T1, a common sustain period T2, and a luminance correction period T3.

The reset period R applies a reset waveform to the scan electrode lines of all groups to initialize the wall charge states of all cells.

The address / sustain mixing period T1 sequentially performs an address operation from the first scan electrode line Y11 to the last scan electrode line Y1m in the first group G1 (AG1). When all of the address operations are completed for the cells of the first group G1, the sustain discharge operation is performed on the first group (S11).

When the first sustain period S11 of the first group G1 ends, an address operation with respect to the cells of the second group G2 is performed (AG2). When the address period AG2 of the second group G2 ends, the first sustain period S21 for the second group G2 is performed. At this time, the second sustain period S12 is also performed in the first group in which the address period has already been performed. At this time, cells which have not yet been performed with an address operation remain in a dormant state.

When the first sustain period S21 of the second group G2 ends, the address period AG3 and the first sustain period S31 are performed in the same manner as described above with respect to the third group G3. During the first sustain period S31 of the third group G3, the sustain periods S13 and S22 may also be performed on the cells of the first and second groups G1 and G2 in which the address period has already been performed. . However, if the gradation level is satisfied by the first and second sustain periods S11 and S21 of the first and second groups, additional sustain periods S13 and S22 may not be performed.

Lastly, the address period AG4 and the first sustain period S41 are performed for the fourth group G4 through the above-described process, and the first sustain period S41 of the fourth group G4 is performed. During the execution, the sustain periods S14, S23, and S32 may also be performed for the cells of the first, second, and third groups G1, G2, and G3 that have already performed the address period.

FIG. 4 shows an example in which all of the cells in the group performed in the address period before the sustain period are performed while the sustain period is performed in the address / sustain mixing period T1 for one group of cells. At this time, assuming that the number of sustain discharge pulses applied during the unit sustain period is the same and thus the luminance expressed by the same is the same, the cells of the first group G1 have n times the luminance compared to the cells of the nth group Gn. Will indicate. Similarly, compared to the cells of the nth group Gn, the cells of the second group G2 will display n-1 times the luminance, and the cells of the n-1th group Gn-1 will exhibit the double luminance. . In order to equally correct the luminance difference for each group, a predetermined additional holding period is required, which is for the luminance correction period T3.

The luminance correction period T3 is a sustain discharge period that is selectively performed for each group so that the gray levels of the cells of each group are equally corrected with each other.

The common sustain period T2 is a period in which sustain discharge pulses are commonly applied to all cells simultaneously for a predetermined period, and the address / sustain mixing period T1 or the address / sustain mixing period T1 and the luminance correction period T3 are applied. The gray level assigned to each subfield may be selectively performed when the specification is not satisfied. The common holding period T2 may be performed after the address / holding mixing period T1 or after the luminance correction period T3, as shown in FIG. In addition, the size of the common holding period T2 may be appropriately changed according to the weight of the subfield, and one subfield may be implemented only with the address / holding mixing period T1.

As described above, after the address operation and the sustain discharge operation for one group are completed, the address operation and the sustain discharge operation of another group are sequentially performed, and the address / sustainment period is extended from the first group G1 to the fourth group G4. It is performed sequentially.

5 is a view showing a driving waveform of the plasma display device according to the first embodiment of the present invention. FIG. 5 illustrates a driving waveform applied to the driving method of FIG. 4 when all scan electrodes Y1 to Yn are divided into two scan electrode groups G1 and G2 for convenience of description, and the scan of the first group G1 is performed. YG1 and the scan electrode of the second group G2 are shown as YG2.

In the reset period, a reset waveform is applied to the scan electrodes YG1 and YG2 of the first and second groups G1 and G2 to initialize the wall charge states of all the cells. That is, the voltages of the scan electrodes YG1 and YG2 are gradually increased from the voltage Vs to the voltage Vset while the reference voltage (0 V in FIG. 5) is applied to the sustain electrodes X1-Xn. Next, while the Ve voltage is applied to the sustain electrodes X1-Xn, the voltages of the scan electrodes YG1 and YG2 are gradually decreased from the Vs voltage to the Vnf voltage. In this manner, the wall charge states of the discharge cells of the first and second groups G1 and G2 are initialized.

In the address / sustain mixing period T1, first, the address period AG1 of the first group G1 is performed, and then the sustain period S11 of the first group G1 is performed. Next, after the address period AG2 of the second group G2 is performed, the second sustain period S12 of the first group G1 and the first sustain period S21 of the second group G2 are performed together. do.

Specifically, an address period AG1 is first performed for the scan electrode YG1 of the first group G1. In this address period AG1, while the VscH voltage is applied to the scan electrode YG2 of the second group G2, the scan pulse having the VscL voltage is sequentially applied to the scan electrode YG1 of the first group G1. Is authorized. Meanwhile, the VscH voltage is applied to the scan electrodes to which the scan pulses are not applied among the scan electrodes YG1 of the first group G1. The address voltage Va is sequentially applied to the address electrodes of the cells to be selected as the cells to be turned on among the address electrodes A1-Am. Then, in the discharge cell formed by the scan electrode YG1 to which the scan pulse is applied and the address electrode to which the address voltage Va is applied, the voltage difference between the voltage VscL applied to the scan electrode YG1 and the address voltage Va is applied. This causes address discharge to be set to the light emitting cell state.

Then, in the sustain period S11, the high level voltage Vs and the low level voltage (Vs) are applied to the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn of the first and second groups G1 and G2, respectively. In FIG. 5, a sustain discharge pulse having an alternating 0 V) is applied to the opposite polarity during the Ts period. Then, sustain discharge occurs in a discharge cell selected as a cell to emit light in the address period AG1 of the scan electrode YG1 of the first group G1. In FIG. 5, the high level voltage Vs of the sustain discharge pulse is applied to the scan electrodes YG1 and YG2, and the low level voltage (0 V in FIG. 5) is applied to the sustain electrodes X1 to Xn. The above number of sustain discharge pulses may be applied.

Then, when the address period AG1 and the sustain period S11 are completed for the scan electrode YG1 of the first group G1, the address period AG2 for the scan electrode YG2 of the second group G2 is subsequently performed. ) Is performed.

Specifically, in the address period AG2 of the scan electrode YG2 of the second group G2, the second group G2 is applied while the VscH voltage is applied to the scan electrode YG1 of the first group G1. The scan pulses having the VscL voltage are sequentially applied to the scan electrode YG2 at. On the other hand, the VscH voltage is applied to the scan electrode to which the scan pulse is not applied to the scan electrode YG2 of the second group G2. As described above, the address operation is performed by applying the address voltage Va to the address electrode of the cell to be selected as the light emitting cell among the address electrodes A1 -Am.

In the sustain periods S21 and S12 of the address / sustain mixing period T1, pulse widths are respectively applied to the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn of the first and second groups G1 and G2. A sustain discharge pulse having a high level voltage Vs which is Ts and a low level voltage (0 V in FIG. 5) is applied. Then, sustain discharge occurs in the cell set to the light emitting cell state of the second group G2 and the cell set to the light emitting cell state of the first group G1. That is, the sustain period S21 of the second group G2 and the second sustain period S12 of the first group G2 are performed simultaneously.

Then, in the common sustain period T2, the pulse widths of the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn of the first and second groups G1 and G2 are Ts and the high level voltage Vs and The sustain discharge pulse is applied to the light emitting cells of the two groups G1 and G2 in common by applying a sustain discharge pulse having the low level voltage (0 V) in the opposite phase.

Then, in the luminance correction period T3, an additional sustain period is given for the second group G2 so that the light emitting cells of the first group G1 and the second group G2 have the same luminance. That is, in the luminance correction period T3, the discharge does not occur in the light emitting cells of the first group G1, and the discharge occurs only for the light emitting cells of the second group G2.

Specifically, when the sustain discharge pulse of the Vs voltage is first applied to the sustain electrodes X1-Xn, the Vs voltage is applied to the scan electrode YG1 of the first group G1, and the scan electrode of the second group G2 is applied. 0V is applied to (YG2). Then, since the voltage difference between the scan electrode YG1 and the sustain electrodes X1 to Xn is 0 V in the light emitting cells of the first group G1, no sustain discharge occurs and only the light discharge cells of the second group G2 generate sustain discharge. . Then, 0 V is applied to the sustain electrodes X1-Xn, and Vs voltage is applied to the scan electrodes YG1 and YG2 of the first and second groups G1 and G2. Then, since there is no previous sustain discharge in the light emitting cells of the first group G1, the wall voltage is formed with the reverse polarity, so that no sustain discharge occurs and the sustain discharge occurs in the light emitting cells of the second group G2. In this manner, the number of sustain discharges of the light emitting cells of the first group G1 is limited by the number of sustain discharges in the sustain period S11, so that the luminance of the first group G1 and the second group G2 is the same. Let's do it.

As described above, if the sustain discharge is performed immediately after the scan electrodes Y1 to Yn are divided into a plurality of groups and the address operation is performed on any one group of discharge cells, the time between the address operation and the sustain discharge operation is short. There is less risk of loss of wall charges, which can result in smooth sustain discharge.

In addition, a discharge cell in which an address operation occurs in the second half also occurs during a sustain discharge by performing a stable address operation by compensating wall charges between the scan electrodes YG1 and YG2 and the address electrodes A1-Am which may be lost during the address period. Can improve the low discharge. That is, in FIG. 5, since no discharge occurs in the scan electrode YG2 of the second group G2 until the address period AG2 of the second group is performed, wall charges formed in the reset period may be lost. . Therefore, in the first embodiment of the present invention, the negative (−) of the space charges is applied by applying the Vs voltage higher than the voltage applied to the address electrodes A1-Am to the scan electrodes YG1 and YG2 in the sustain period S11. Wall charges are formed on the scanning electrode YG2 side. As a result, the address operation in the address period AG2 of the second group can be more stably performed.

In this case, as the time for applying and maintaining the high level voltage Vs to the scan electrodes YG1 and YG2 of the first and second groups G1 and G2 in the sustain period S11 becomes longer, the scan electrodes YG1 and YG2 become longer. Wall charge compensation can be more effective. Therefore, it is preferable to increase the width of the sustain discharge pulse from the Ts period to the Ts1 period in the sustain period S11 as indicated by the dotted line in FIG. 5. However, when the Ts1 period is too long, it also affects the wall charge state between the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn, so that not only the cell selected as the light emitting cell in the address period AG1 of the first group but also other cells are selected. Incorrect discharge may occur.

Therefore, the following proposes another preferred embodiment of the present invention.

6 illustrates a driving waveform of the plasma display device according to the second embodiment of the present invention. In addition, in FIG. 6, except that the sustain discharge pulse applied to the sustain electrodes X1-Xn in the sustain period S11 is similar to that of the driving waveform and the operation thereof described with reference to FIG. 5, the rest of the period will be described. Omit it.

As shown in FIG. 6, when a sustain discharge pulse is applied to the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn in the sustain period S11, a high level voltage () is applied to the scan electrodes YG1 and YG2. By applying the high level voltage Vs to the sustain electrodes X1-Xn in a portion of the period during which Vs) is applied and held, the voltage difference between the two electrodes is reduced to prevent erroneous discharge.

Specifically, the high level voltage Vs is applied to the scan electrodes YG1 and YG2 during the sustain period S11 during the Ts1 period, and the low level is applied to the sustain electrodes X1-Xn during the Ts2 period, which is a part of the Ts1 period. After the sustain discharge is applied by applying a voltage (0 V in FIG. 6), the high level voltage Vs is applied again during the Ts3 period. At this time, a reference voltage (0 V in FIG. 6) is applied to the address electrodes A1-Am.

Then, during the Ts2 period, in the discharge cell selected in the address period AG1 for the scan electrode YG1 of the first group G1 earlier by the voltage difference between the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn, Maintenance discharge will occur. In addition, in the remaining discharge cells not selected in the address period AG1 for the scan electrode YG1 of the first group G1, the space charges of the negative polarity in the discharge space move toward the scan electrodes YG1 and YG2. The wall charges lost during the address period are compensated by shifting the spatial charges of the positive polarity toward the address electrodes A1-Am to which the low level voltage 0V is applied relative to the scan electrode.

Then, when the high level voltage Vs is applied to the sustain electrodes X1-Xn again during the Ts3 period, the voltage difference between the scan electrodes YG1 and YG2 and the sustain electrodes X1-Xn disappears, thereby maintaining the sustain electrodes X1-Xn. This can prevent excessive accumulation of wall charges. Therefore, erroneous discharge between the scan electrodes YG1 and YG2 and the sustain electrodes X1 to Xn can be prevented. In FIG. 6, although the voltage Vs is applied to the sustain electrodes X1-Xn as the high level voltage during the Ts3 period, a voltage having a positive polarity lower than the voltage Vs may be applied. For example, the Ve voltage may be applied to the sustain electrodes X1-Xn during the Ts3 period to reduce the voltage difference between the scan electrodes YG1 and YG2 and the sustain electrodes X1-Xn to prevent the misdischarge.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the embodiment of the present invention, more stable sustain discharge can be performed by adjusting the width and magnitude of the sustain discharge pulses applied to the scan electrode and the sustain electrode in the sustain period located in the plurality of address periods.

Claims (12)

A method of driving a plasma display device comprising a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the plurality of first and second electrodes, The plurality of first electrodes may be divided into a plurality of groups including at least first and second groups, and in at least one subfield including a plurality of address periods and a plurality of sustain periods respectively corresponding to the plurality of groups. , In a first sustain period located between the address period of the first group and the address period of the second group of the plurality of sustain periods, Generating a first voltage difference between the plurality of first electrodes and the plurality of second electrodes during a first period of time; And And generating a second voltage difference smaller than the first voltage difference between the plurality of first electrodes and the plurality of second electrodes during a second period. The method of claim 1, An opposite polarity of a sustain discharge pulse having alternating high and low level voltages to the plurality of first and second electrodes in a second sustain period that is located after the second group of address periods of the plurality of sustain periods; The method of driving a plasma display device further comprising the step of applying a sustain discharge. The method of claim 2, And the sum of the first period and the second period is longer than the width of the high level voltage of the sustain discharge pulse. The method of claim 1, And the first voltage difference is a voltage difference causing a sustain discharge to a cell selected as a cell to emit light in an address period of the first group. The method of claim 1, And the second voltage difference is zero. The method according to any one of claims 1 to 5, And the second period is a period continuous to the first period. A plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the plurality of first and second electrodes, wherein the plurality of first electrodes comprise at least a first group and a first; A plasma display panel divided into a plurality of groups including two groups; Generating a control signal for driving the plasma display panel, dividing a frame into a plurality of subfields, a plurality of address periods corresponding to the plurality of groups in at least one subfield of the plurality of subfields, and A control unit for allocating a retention period; A driving unit driving the plasma display panel; The driving unit, Applying a first voltage to the plurality of first electrodes in a first sustain period that is located between the address period of the first group and the address period of the second group, Applying a second voltage lower than the first voltage to the plurality of second electrodes in a first period of a part of the period during which the first voltage is applied, And applying the third voltage higher than the second voltage to the plurality of second electrodes in a second period of a part of the period during which the first voltage is applied. The method of claim 7, wherein The driving unit, A plasma for applying a sustain discharge pulse having a high level voltage and a low level voltage alternately to the plurality of first electrodes and the second electrodes, respectively, in a second polarity period located after the second group of address periods with opposite polarities; Display device. The method of claim 8, And a period in which the first voltage is applied is longer than a width of the high level voltage of the sustain discharge pulse. The method of claim 7, wherein The sum of the first period and the second period is the same as the period during which the first voltage is applied. The method of claim 7, wherein And a plasma display device having the same level as the first voltage and the third voltage. The method according to any one of claims 7 to 11, And the second period is a period continuous to the first period.

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