KR100740104B1 - Plasma display and driving method thereof - Google Patents

Abstract

In the plasma display device, a plurality of subfields are driven by being divided into a plurality of subfield groups. In this case, the plurality of row electrodes is divided into a first row group and a second row group in the first subfield group, and the plurality of row electrodes are divided into at least three row groups in the second subfield group. In each subfield of the first subfield group, the light emitting cells are selected in the discharge cells of the first row group during the first address period, and the light emitting cells of the first row group are sustained and discharged during the first sustain period, followed by the second address period. The light emitting cells are selected from the discharge cells of the second row group during the sustain period, and the light emitting cells of the second row group are sustain discharged. In each subfield of the second subfield group, a non-light emitting cell of the light emitting cells of each row group is selected during the third address period for each row group of the plurality of row groups, and then between two adjacent third address periods. During the third sustain period, the discharge cells in the light emitting cell state of the plurality of row groups are sustained and discharged. As described above, when the first subfield group is divided into two row groups, the sustain discharge can be stably performed while the plurality of row electrodes are driven without being grouped, and the plurality of row electrodes are divided into three or more row groups. In comparison, the length of the total holding period can be reduced in one subfield.

PDP, electrode, discharge, selective write, selective erase, reset, gradation, light emission

Description

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

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

2 is a diagram schematically illustrating a method of driving a plasma display device according to a first embodiment of the present invention.

3 is a view illustrating a driving waveform of a specific plasma display device of the driving method shown in FIG. 2.

4 is a diagram illustrating a gray scale expression method according to the driving method of FIG. 2.

5 is a diagram schematically illustrating a method of driving a plasma display device according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating a gray scale expression method according to the driving method of FIG. 5.

7 is a view schematically illustrating a method of driving a plasma display device according to a third embodiment of the present invention.

FIG. 8 illustrates driving waveforms of a specific plasma display device according to the driving method of FIG. 7.

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

The plasma display device is a display device using a plasma display panel that displays text or an image by using plasma generated by gas discharge. In the plasma display panel, a plurality of discharge cells are arranged in a matrix form.

In the plasma display device, one field (1TV field) is divided into a plurality of subfields having respective weights and driven, and the gray level is displayed by a combination of the weights of the subfields in which the display operation occurs among the plurality of subfields. Each subfield includes a reset period, an address period, and a sustain period. The reset period is a period for initializing the state of the discharge cells in order to stably perform the next address discharge, and the address period is a period for selecting discharge cells to emit light and discharge cells not to emit light among the plurality of discharge cells. The sustain period is a period in which sustain discharge is performed on the discharge cells selected in the address period in order to actually display an image.

At this time, there is a method of performing the sustain discharge operation on all the discharge cells after completing the addressing operation for all the discharge cells in each subfield, that is, a method of temporally separating the address period and the sustain period. This is generally referred to as an address display period separation (ADS) method. The ADS method can be easily implemented, but since the addressing operation is sequentially performed on all discharge cells, address discharge may not occur well due to a lack of priming particles in the discharge cells in the discharge cells that are addressed later in time. Therefore, the width of the scan pulses sequentially applied to the scan electrodes is inevitably increased for stable address discharge, thereby increasing the length of the address period. As a result, the length of the subfield is long, which limits the number of subfields that can be used in one field.

Unlike the ADS method, an address pulse of each line is inserted between successive sustain discharge pulses to perform an addressing operation on another line while sustain discharge is performed on one line. That is, the method does not separate the address period and the sustain period, which is generally referred to as an address while display (AWD) method. In this AWD method, since the address pulse and the sustain discharge pulse proceed in succession, a reset pulse for initialization must be entered between these successive pulses. Therefore, a reset pulse that requires a long time cannot be used. That is, since the reset discharge must be performed with a strong discharge, the black screen looks bright and the contrast ratio worsens.

In addition, both the ADS method and the AWD method use subfields having different weights for gray scale representation. For example, in the case of using a weighted subfield in the form of a power of 2, a pseudo contour is generated when one discharge cell expresses 127 gray levels and 128 gray levels, respectively, in two consecutive frames.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a driving method thereof capable of scanning at high speed and improving contrast ratio. Another object of the present invention is to provide a plasma display device and a driving method thereof capable of reducing the pseudo contour and increasing the number of gray levels that can be expressed.

According to one aspect of the present invention, in a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells defined by the row electrode and the column electrode, one field is divided into a plurality of subfields. A method of dividing into driving is provided. The driving method includes dividing the plurality of subfields into a plurality of subfield groups including first and second subfield groups, wherein the plurality of row electrodes are divided into a first row group and a first row group in the first subfield group. Dividing into two row groups, in each subfield of the first subfield group, a light emitting cell among discharge cells of the first row group is selected during a first address period, and Sustain-discharging the light emitting cells, in each of the subfields of the first subfield group, light emitting cells of the discharge cells of the second row group are selected during a second address period, and the second row during the second sustain period Sustain-discharging the light emitting cells of the group, dividing the plurality of row electrodes into a plurality of row groups including at least three row groups in the second subfield group, and the second subfield group In each subfield, selecting a non-light emitting cell among light emitting cells of each row group during a third address period for each row group of the plurality of row groups, and in each subfield of the second subfield group, Sustain-discharging the discharge cells in the light-emitting cell state of the plurality of row groups during a third sustaining period located between two adjacent third address periods.

According to another feature of the present invention, in a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells respectively defined by the row electrode and the column electrode, one field is divided into a plurality of subfields. A method of dividing into driving is provided. The driving method includes dividing the plurality of subfields into a plurality of subfield groups including first and second subfield groups, wherein the plurality of row electrodes are divided into a first row group and a first row group in the first subfield group. Dividing into two row groups, in each subfield of the first subfield group, selecting a light emitting cell among discharge cells of the first row group and sustain-discharging the light emitting cells of the first row group; In each of the subfields of the first subfield group, selecting a light emitting cell among the discharge cells of the second row group, and sustaining and discharging the light emitting cells of the second row group; Dividing a row electrode into a plurality of row groups including at least three row groups, in a first subfield temporally leading in the second subfield group, a third row group of the plurality of row groups Selecting a light emitting cell from a discharge cell of the cell, and sustaining discharge of the light emitting cell of the third row group, in the first subfield, selecting a light emitting cell from a discharge cell of a fourth row group among the plurality of groups, Sustain-discharging the light emitting cells of the fourth row group, in the second subfield of the second subfield group, non-light emitting cells are selected from the light emitting cells of the third row group, and the rest of the third row group Sustain-discharging the light-emitting cells, and selecting, in the second subfield, non-light-emitting cells among the light-emitting cells of the fourth row group, and sustain-discharging the remaining light-emitting cells of the fourth row group.

According to another feature of the present invention, a plasma display device including a plasma display panel, a controller, and a driver is provided. The plasma display panel includes a plurality of row electrodes for performing a display operation and a plurality of column electrodes formed in a direction crossing the row electrodes, and a plurality of discharge cells are formed by the plurality of row electrodes and the plurality of column electrodes. do. The controller divides the plurality of subfields into a plurality of subfield groups including first and second subfield groups, and the plurality of row electrodes are divided into first row groups and second row groups in the first subfield group. And dividing the plurality of row electrodes into a plurality of row groups including at least three row groups in the second subfield group. The driver selects light emitting cells of the first row group during a first address period and light emitting cells of the second row group during a second address period in each subfield of the first subfield group. In each subfield of the second subfield group, a non-light emitting cell is selected among the light emitting cells of each row group during the third address period for each row group of the plurality of row groups.

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.

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

First, a plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500. It includes.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as “A electrodes”) A1 to Am extending in the column direction, and a plurality of sustain electrodes extending in pairs to each other in the row direction (hereinafter, “X”). Electrodes ”(X1 to Xn) and scan electrodes (hereinafter referred to as“ Y electrodes ”) (Y1 to Yn). In general, the X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and the X electrode and the Y electrode perform a display operation for displaying an image in the sustain period. The Y electrodes Y1 to Yn and the X electrodes X1 to Xn are arranged to be orthogonal to the A electrodes A1 to Am. At this time, the discharge space at the intersection of the A electrodes A1 to Am and the X and Y electrodes X1 to Xn and Y1 to Yn forms the cell 12. The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention.

The controller 200 receives an image signal from the outside and outputs an A electrode driving control signal, an X electrode driving control signal, and a Y electrode driving control signal. In this case, the controller 200 divides and drives one frame into a plurality of subfields having respective luminance weights, and the plurality of subfields are driven into a plurality of groups again. In addition, the plurality of X electrodes and the Y electrodes are divided into a plurality of groups and driven.

The address electrode driver 300 receives the A electrode driving control signal from the controller 200 and applies a driving voltage to the A electrodes A1 to Am.

The scan electrode driver 400 receives the Y electrode driving control signal from the controller 200 and applies a driving voltage to the Y electrodes Y1 to Yn.

The sustain electrode driver 500 receives the X electrode driving control signal from the controller 200 and applies a driving voltage to the X electrodes X1 to Xn.

In the following description, the X electrode and the Y electrode extending in pairs with each other in the row direction are referred to as row electrodes, and the A electrode extending in the column direction is referred to as column electrodes.

Next, a driving method of the plasma display device according to the first embodiment of the present invention will be described in detail with reference to FIG. 2. In the first embodiment of the present invention, the lengths of the sustain periods applied after the address period of each row group are the same, and the sustain periods have the same length in all the subfields.

2 is a diagram schematically illustrating a method of driving a plasma display device according to a first embodiment of the present invention.

As shown in Fig. 2, one field consists of a plurality of subfields SF11-SF1L, and the plurality of row electrodes X1 to Xn and Y1 to Yn are divided into a plurality of row groups. In FIG. 2, it is assumed that the plurality of row electrodes X1 to Xn and Y1 to Yn are grouped into physical groups in order to be divided into eight groups. At this time, the first to jth row electrodes are set to the first row group G ₁ , and the (j + 1) th to (2j) th row electrodes are set to the second row group G ₂ . In this manner, the (7j + 1) th to nth row electrodes are set to the eighth row group G ₈ (where j = n / 8). Alternatively, the row electrodes spaced apart at regular intervals may be set as a group, and the row electrodes may be grouped in an irregular manner as necessary.

And the first sub-field (SF11) is divided into a reset period (R11), an address period (WA11 ₁ ~WA11 ₈₎ and made of a holding period (S11 ₁ ~S11 _8), a first address period of the subfield (SF11) (WA11 _{1 to} WA11 ₈ are made of a selective write address. The second subfield to the last subfield SF12 to SF1L consist of address periods EA12 _{1 to} EA1L ₈ and sustain periods S12 _{1 to} S1L ₈ , and from the second subfield to the last subfield SF12 to SF1L. The address periods EA12 _{1 to} EA1L ₈ have a selective erase method. As described above, in the first embodiment, the plurality of subfields SF11 to SF1L include a subfield group of the selective writing method and a subfield group of the selective erasing method.

There are a selective writing method and a selective erasing method for selecting a discharge cell to emit light and a discharge cell not to emit light among a plurality of discharge cells. The selective write method is a method of selecting a discharge cell to emit light to form a constant wall voltage, and the selective erasing method is a method of selecting a discharge cell that will not emit light to erase a wall voltage already formed. That is, the selective write method is a method of address discharge of a cell in a non-light emitting cell state to form a wall charge and set it to a light emitting cell state, and the selective erasing method of addressing a cell in a light emitting cell state to discharge a wall charge already formed. It is a method of erasing and setting to a non-light emitting cell state. In the subfield having the address period of the selective writing method, a reset period for initializing the light emitting cells to non-light emitting cells is generally formed immediately before the address period. In the following, the address discharge for forming the wall charge in the selective writing method is called "write discharge", and the address discharge for erasing the wall charge in the selective erasing method is called "erasure discharge".

Referring to FIG. 2 again, the first subfield SF11 having the address period of the selective writing method has a reset period R11 for initializing all discharge cells and setting them to the non-light emitting cell state. That is, in the reset period R11 of the first subfield SF11, first, the discharge cells of all the row groups G _{1 to} G ₈ are initialized and set to the non-light emitting cell state, and the state is set to the state in which the write discharge is possible in the address period. do.

Then, the first sub-field (SF11) in the first to eighth row groups during the address period (WA11 ₁ ~WA11 _8), and a sustain period (S11 ₁ ~S11 ₈₎ of the (G ₁ ~G ₈₎ are performed sequentially. That is, the i is the sustain period (S11 _i) of the line group (G _i) the address period (WA11 _i) is performed, the i group (G _i) is performed after the. Subsequently, the address period WA11 _{i + 1} and the sustain period S11 _{i + 1 of} the (i + 1) th row group G _{i + 1} are performed.

Specifically, in the address period WA11 ₁ , the discharge cells set as the light emitting cells among the discharge cells of the first row group G ₁ are write-discharged to form wall charges, and the first row group G in the sustain period S11 ₁ . The light emitting cell of ₁ ) is sustained and discharged. Subsequently, in the address period WA11 ₂ , wall discharge is formed by writing and discharging the discharge cells set as light emitting cells among the discharge cells of the second row group G ₂ , and in the sustain period S11 ₂ , the second row group G _{2 is formed.} Sustain light discharge cell. At this time, sustain discharge also occurs in the light emitting cells of the first row group G ₁ . Similarly, for the other line group (G ₃ ~G ₈₎ during the address period (WA11 ₃ ~WA11 _8), and a sustain period (S11 ₃ ~S11 ₈₎ it is performed.

At this time, the i group (G _i) a sustain period (S11 _i) in the i th row group (G _i) the light-emitting cell and the first through the (i-1) line group (G ₁ ~G _i-1) of the The sustain discharge also occurs in the light emitting cell. The discharge cells of the _i th row group G _i set as light emitting cells in the first subfield SF11 are held just before the address period EA12 _i of the i th row group G _i of the second subfield SF12. The discharge is sustained until the periods S11 _{i to} S11 ₈ and S12 _{1 to} S12 _i-1 . That is, in the light emitting cells of the _i th row group G _i , sustain discharge occurs for a total of 8 sustain periods.

The address period of the next, the first to eighth row group in the second sub-field (SF12) having an address period of the selective erasing mode _{(G 1 ~G 8) (EA12} 1 ~EA12 8) , and a sustain period (S12 ~ S12 _{1 8} ) is performed sequentially. That is, the i is the sustain period (S12 _i) of the line group (G _i) the address period (EA12 _i) is performed, the i group (G _i) is performed after the. Subsequently, the address period EA12 _{i + 1} and the sustain period S12 _{i + 1 of} the (i + 1) th row group G _{i + 1} are performed.

Specifically, in the address period EA12 ₁ , the discharge cells set as the non-light emitting cells of the light emitting cells of the first row group G ₁ are erased and discharged to erase the wall charges, and in the sustain period S12 ₁ , the first row group ( The remaining light emitting cells of G ₁ ) are sustained and discharged. Subsequently, in the address period EA12 ₂ , the discharge cells set as the non-light emitting cells of the light emitting cells of the second row group G ₂ are erased and discharged to erase the wall charges, and the second row group G is maintained in the sustain period S12 ₂ . The remaining light emitting cells in ₂ ) are sustained and discharged. At this time, sustain discharge also occurs in the light emitting cells of the first row group G ₁ . Similarly, remaining lines in the group (G ₃ ~G ₈₎ about the address period (EA12 ₃ ~EA12 _8), and a sustain period (S12 ₃ ~S12 ₈₎ is performed.

At this time, the i group (G _i) a sustain period (S12 _i) in the i th row group (G _i) the light-emitting cell and the first through the (i-1) line group (G ₁ ~G _i-1) of the The sustain discharge also occurs in the light emitting cell. And the i-th row group (G _i) of the light-emitting cell denotes a third sub-field (SF13) the i-th row group (G _i) the address period (EA13 _i) a sustain period of the immediately preceding _(i ~S11 ₈ S11, S12 ~ ₁ of Sustain discharge until S12 _i-1 ). That is, in the light emitting cells of the _i th row group G _i , sustain discharge occurs for a total of 8 sustain periods.

The remaining subfields SF13 to SF1L having the address period of the selective erasing method also have the same address periods EA13 _{1 to} EA13 ₈ , for each row group G _{1 to} G ₈ , similarly to the second subfield SF12 described above. ..., EA1L _{1 to} EA1L ₈ ) and the sustain periods S13 _{1 to} S13 ₈ , ..., S1L _{1 to} S1L ₈ are performed. In this way, the discharge cells set to the light emitting cells by the write discharge in the first subfield SF11 continue until they are set to the non-light emitting cells by the erase discharge in the address periods EA12 _{i to} EA1L _i of the subsequent subfields SF12 to SF1L. When the sustain discharge is performed and the non-light emitting cell becomes the erase discharge, the sustain discharge is not started from the subfield.

In the last subfield SF1L, in order to make the number of sustain discharges in each row group G _{1 to} G ₈ equal to each other, the _second subfield SF1L is once to each of the second to eighth row groups G _{2 to} G ₈ . Seven maintenance periods SA1 _{2 to} SA1 ₈ are additionally performed.

To this end, additional retention periods SA1 _{2 to} SA1 ₈ are formed in the last subfield SF1L for the second to eighth row groups G _{2 to} G ₈ , respectively. And additional sustain period (SA1 ₂ ~SA1 ₈₎ additional sustain period (SA1 ₂ ~SA1 ₈ of 8 times the sustain period in order to prevent sustain discharge in the groups of rows are performed, each row group (G ₂ ~G ₈₎ in The erasing periods ER1 _{1 to} ER1 ₇ for erasing the wall charges formed in the immediately preceding row groups G _{1 to} G ₇ are formed immediately before.

On the other hand, the eighth row group is (G ₈₎ may be formed in the erase period (ER1 ₈₎ for erasing wall charges in the additional sustain period (SA1 _8), even after the eighth row group (G ₈₎ a. In addition, since the reset period R11 is performed in the first subfield SF11 of the subsequent field, the erase period ER1 ₈ of the eighth row group G ₈ may not be formed. The erase operations in the erase periods ER1 _{1 to} ER1 ₈ may be sequentially performed on each row electrode of each row group as in the address period, or may be simultaneously performed on all row electrodes of each row group.

Specifically, after the sustain period S1L ₈ of the eighth row group G ₈ of the last subfield SF1L is performed, all discharge cells of the first row group G _{1 are} erased in the erase period ER1 ₁ . Eliminates wall charges that have formed. Then, in the sustain period SA1 ₂ , the light emitting cells of the second to eighth row groups G _{2 to} G ₈ are sustained and discharged. Then, after erasing the wall charges formed in all the discharge cells of the second row group G ₂ in the erasing period ER1 ₂ , the third to eighth row groups G ₃ in the sustaining period SA1 ₃ . It keeps discharging the light emitting cells of ~G _8). In this way, it is performed until the maintenance period SA1 ₈ . In this way, the number of sustain discharges in the light emitting cells of each row group G _{1 to} G ₈ is the same.

Next, a driving waveform used in the driving method of the plasma display device according to the first embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a view illustrating a driving waveform of a specific plasma display device of the driving method shown in FIG. 2. In FIG. 3, only the first and second row groups G ₁ and G ₂ and the first and second subfields SF11 and SF12 are illustrated for convenience of description, and the driving waveforms applied to the A electrode are not shown. The description of the driving waveform applied to the A electrode is also omitted.

As shown in FIG. 3, in the reset period R11 of the first subfield SF11, Y of all the row groups G ₁ and G ₂ in the state where a reference voltage (0 V in FIG. 3) is applied to the X electrode. The voltage of the electrode is gradually increased from Vs voltage to Vset voltage. Then, a weak reset discharge occurs between the Y electrode and the X electrode while the voltage of the Y electrode increases, and wall charges are formed in the discharge cells of all the row groups G ₁ and G ₂ . Subsequently, with the Vs voltage applied to the X electrode, the voltages of the Y electrodes of all the row groups G ₁ and G ₂ are gradually decreased from the Vs voltage to the Vnf voltage. Then, while a weak reset discharge occurs between the Y electrode and the X electrode while the voltage of the Y electrode decreases, the wall charges formed in the discharge cells of all the row groups G ₁ and G ₂ are erased and initialized to the non-light emitting cell. In general, the magnitude of the voltage (Vnf-Vs) is set near the discharge start voltage between the Y electrode and the X electrode. As a result, the wall voltage between the Y electrode and the X electrode becomes almost 0 V, thereby preventing the non-light emitting cell in which the address discharge has not occurred in the address period from being erroneously discharged in the sustain period.

In the address period WA11 ₁ , while the Vs voltage is applied to the X electrode, first, a scan pulse of the VscL1 voltage is sequentially applied to the plurality of Y electrodes of the first row group G1. At this time, an address pulse (not shown) having a positive voltage is applied to the A electrode of the discharge cell to emit light among the discharge cells formed by the Y electrode to which the scan pulse is applied. Then, write discharge occurs in the discharge cells to which the VscL1 voltage of the scan pulse and the positive voltage of the address pulse are applied, and wall voltages are formed on the X and Y electrodes to form light emitting cells. The Y electrode to which the scan pulse is not applied applies a VscH1 voltage higher than the voltage of the scan pulse, and a reference voltage is applied to the A electrode to which the address pulse is not applied, although not shown. At this time, the voltage VscH1 is also applied to the Y electrodes of the second to eighth row groups G _{2 to} G ₈ .

Next, in the sustain period S11 ₁ , the sustain discharge pulse of the voltage Vs is applied to the Y electrodes of all the row groups G ₁ and G ₂ to sustain discharge the light emitting cells. Subsequently, sustain discharge pulses of the voltage Vs are applied to the X electrodes of all the row groups G ₁ and G ₂ to sustain discharge the light emitting cells. In this case, first, because only the cells are light emitting cells, the discharge written in the address period (WA11 ₁₎ of the line group (G ₁₎ takes place, the first line group during the address period of the (G ₁₎ (WA11 ₁₎ only happened cell address discharge in Sustain discharge occurs.

While the sustain discharge pulse is applied to the X electrode, in the address period WA11 ₂ , the scan pulses of the VscL1 voltage are sequentially applied to the plurality of Y electrodes of the second row group G ₂ while the Vs voltage is applied to the X electrode. Is applied, an address pulse having a positive voltage is applied to the A electrode of the discharge cell to emit light among the discharge cells formed by the Y electrode to which the scan pulse is applied, and the cell in the non-light emitting cell state is discharged to the light emitting cell. Set it.

Next, in the sustain period S11 ₂ , the sustain discharge pulse of the voltage Vs is applied to the Y electrodes of all the row groups G ₁ and G ₂ to sustain discharge the light emitting cells. Subsequently, sustain discharge pulses of the voltage Vs are applied to the X electrodes of all the row groups G ₁ and G ₂ to sustain discharge the light emitting cells. In this case, the first and second groups of rows, so (G _1, G ₂₎ the address period, cells are light-emitting cells are discharged written in (WA11 _1, WA11 ₂₎ takes place in the first and second row groups (G _1, G ₂ Sustain discharge occurs in a cell in which address discharge has occurred in the address periods WA11 ₁ and WA11 ₂ . In this manner, an address period and a sustain period are performed for each row group in the first subfield SF11.

Next, in the address period EA12 ₁ of the second subfield SF12, scan pulses of the VscL2 voltage are sequentially applied to the plurality of Y electrodes of the first row group G ₁ while the reference voltage is applied to the X electrode. do. At this time, an address pulse (not shown) having a positive voltage is applied to the A electrode of the cell to be selected as the non-light emitting cell among the light emitting cells (cells in which sustain discharge has occurred in the first subfield) formed by the Y electrode to which the scan pulse is applied. do. A VscH2 voltage higher than the VscL2 voltage is applied to the Y electrode to which the scan pulse is not applied, and a reference voltage is applied to the A electrode to which the address pulse is not applied. Then, erase discharge occurs in the light emitting cell to which the VscL2 voltage of the scan pulse and the positive voltage of the address pulse are applied, so that the wall charges formed on the X electrode and the Y electrode are erased and set as the non-light emitting cell.

In the light emitting cell of the first subfield SF11, the cell in which the erasure discharge has not occurred in the address period EA12 ₁ of the second subfield SF12 is the light emitting cell of the second subfield SF12, and thus, the second subfield. In the sustain period S12 ₁ of the SF12, a sustain discharge pulse having a voltage of Vs is first applied to the X electrodes of the first and second row groups G ₁ and G _{2 to} generate sustain discharge in the light emitting cell, and then to the first electrode. And a Vs voltage is applied to the Y electrodes of the second row groups G ₁ and G ₂ to generate sustain discharge in the light emitting cells.

Then, in the address period EA12 ₂ , while a reference voltage is applied to the X electrode, a scan pulse of a VscL2 voltage, which is a negative voltage, is sequentially applied to the plurality of Y electrodes of the second row group G ₂ , and the scan is performed. An address pulse (not shown) having a positive voltage is applied to the A electrode of the cell to be selected as the non-light emitting cell among the light emitting cells (cells in which sustain discharge has occurred in the first subfield) formed by the Y electrode to which the pulse is applied. Then, erase discharge occurs in the light emitting cell to which the VscL2 voltage of the scan pulse and the positive voltage of the address pulse are applied, so that the wall charges formed on the X electrode and the Y electrode are erased and set as the non-light emitting cell.

Subsequently, in the sustain period S12 ₂ , sustain discharge pulses of the voltage Vs are first applied to the X electrodes of the first and second row groups G ₁ and G _{2 to} generate sustain discharge in the light emitting cells, and then the first and second electrodes. The voltage Vs is applied to the Y electrodes of the row groups G ₁ and G ₂ to cause sustain discharge in the light emitting cells. In this manner, the address period and the sustain period are performed for the remaining row groups G _{3 to} G ₄ .

As described above, in the first embodiment of the present invention, since the address period is formed between the sustain periods of each row group, the priming particles formed in the sustain period can be fully utilized in the address period. Can be. In addition, since the voltage gradually increases and the voltage gradually decreases in the reset period, no strong discharge occurs in the reset period, and the contrast ratio can be increased because one reset period is performed for one field for every row group.

Next, a method of expressing gray scales by the driving method of FIG. 2 will be described with reference to FIG. 4.

4 is a diagram illustrating a gray scale expression method according to the driving method of FIG. 2. In FIG. 4, one field includes 31 subfields. In FIG. 4, "SW" indicates that the non-light emitting cell is set as the light emitting cell by writing discharge in the corresponding subfield, and "SE" indicates that the light emitting cell is set as the non-light emitting cell because the erasure discharge occurs in the subfield. In addition, "o" represents a subfield in which the discharge cell is in the light emitting cell state. The gray level when sustain discharge occurs only in one subfield is referred to as 1.

As shown in Fig. 4, when a non-light emitting cell is made in the address period WA11 _i of the first subfield SF11, sustain discharge does not occur in the sustain period S11 _i , and is also retained in the next subfields SF12 to SF1L. Since no discharge occurs, zero gradation is expressed. In the address period WA11 _{i of} the first subfield SF11, since the sustain discharge occurs in the first subfield SF11, one gray level can be expressed. Next, when an erase discharge occurs in the second subfield SF12 to become a non-light emitting cell, sustain discharge does not occur from the second subfield SF12. In addition, since the erase discharge is not generated in the second subfield SF12, since it is a light emitting cell, sustain discharge also occurs in the second subfield SF12 to express two gray levels. That is, the discharge cells which become light emitting cells in the first subfield SF11 and become non-light emitting cells in the K-th subfield SF1K are the first to the (K-1) th subfield SF1 (K). Since sustain discharge continues in -1)), the (K-1) gradation is finally expressed. That is, when one field is composed of 31 subfields as shown in FIG. 3, 32 tones can be expressed from 0 to 31 tones.

As described above, in the first embodiment, gray scales are represented by subfields that are turned on continuously from the first subfield, so that a pseudo outline does not occur. However, since the number of subfields that can fit in one field is limited, the number of gradations that can be expressed only by the subfields is limited.

Hereinafter, a method of increasing the number of gray levels that can be expressed by a combination of subfields in one field will be described in detail with reference to FIG. 5.

5 is a diagram schematically illustrating a method of driving a plasma display device according to a second embodiment of the present invention.

As shown in FIG. 5, the driving method according to the second embodiment of the present invention divides a plurality of subfields SF21 to SF2M into two groups of subfields. In FIG. 5, the subfields of the first group include first to third subfields SF21 to SF23. At this time, the subfields SF21 to SF23 of the first group are formed temporally before the subfields SF24 to SF2M of the second group and include at least one subfield having respective weights. The subfields of the first group are driven by dividing the plurality of row electrodes into fewer row groups than in the first embodiment, and the address periods WA21 _{1 to} WA23 ₂ of the subfields of the first group are selectively written. (Selective Write Address). In FIG. 5, a plurality of row electrodes are divided into two row groups in a subfield of the first group. In this case, when the plurality of row electrodes are divided into two row groups G ₁₁ and G ₁₂ , the first row group G ₁₁ including the row electrodes formed on the plasma display panel 100 and the plasma display panel ( The second row group G ₁₂ including row electrodes formed under the bottom portion 100 may be divided, and the plurality of row electrodes may be divided into a first row group G ₁₁ including an even row electrode and an odd row electrode. It may also be divided into a second group of rows G ₁₂ .

Since the subfields SF24 to SF2M of the second group are the same as the subfields SF11 to SF1L of the first embodiment of the present invention, the description of the subfields SF24 to SF2M of the second group will be omitted below. .

Specifically, in the reset period R21 of the first subfield SF21, the discharge cells of all the row groups G ₁₁ and G ₁₂ are initialized and set to the non-light emitting cell state, and in the address periods WA21 ₁ and WA21 ₂ . It is set in a state where address discharge is possible.

In the address period WA21 ₁ , the discharge cells to be set as light emitting cells among the discharge cells of the first row group G ₁₁ are write-discharged to form wall charges, and in the sustain period S21 ₁ of the first row group G ₁ The light emitting cells are sustained and discharged. Subsequently, the wall charges formed in the light emitting cells of the first row group G ₁₁ are erased. Then, the light emitting cells of the first row group (G ₁₁₎ emits light only in the sustain period (S21 ₁₎ of the first row group (G _11). Next, in the address period WA21 ₂ , the discharge cells to be set as light emitting cells among the discharge cells of the second row group G ₁₂ are write-discharged to form wall charges, and the second row group G ₁₂ in the sustain period S21 ₂ . After sustain discharge of the light emitting cells, the wall charges formed in the light emitting cells of the second row group G ₁₂ are erased. In this manner, the address periods and the sustain periods WA22 ₁ , S22 ₁ , WA22 ₂ , S22 ₂ , WA23 ₁ , S23 ₁ , WA23 ₂ , and S23 ₂ of the second and third subfields SF22 and SF23 are sequentially formed. Proceed.

On the other hand, the light emitting cells of the respective row groups in each subfield (SF21~SF23) of one group (G _11, G ₁₂₎ sustain period (S21 ₁ ~S21 ₂₎ each row group after the (G _11, G ₁₂₎ of the In order to erase the wall charges formed in the wall, in the sustain periods S21 _{1 to} S21 _{2 of} each row group G ₁₁ and G ₁₂ , the last pulse width of the sustain discharge pulse is different so that the wall charges are not formed. It can be implemented by making it narrower than. Alternatively, the wall charge formed by the sustain discharge may be erased by using a waveform capable of gradually changing the voltage of the row electrode immediately after the last sustain discharge pulse (for example, a waveform changed into a lamp shape). Since the reset periods R22 to SF24 are formed at the beginning of the subfields SF22 to SF24 subsequent to each of the subfields SF21 to SF23 of the first group, each of the subfields SF21 to SF23 of the first group is formed. In the last sustain periods S21 ₂ , S22 ₂ , and S23 ₂ , the wall charges may not be erased after the last sustain discharge.

The subfields SF21 to SF23 of the first group have reset periods R21, R22, and R23, respectively, so that the current cell can be set as a light emitting cell irrespective of the cell state in the immediately preceding subfield. Therefore, the discharge cells in the subfields SF21 to SF23 of the first group can be selectively sustained discharged. In this case, when the weights of the subfields SF21 to SF23 of the first group are 1, 2, and 4, respectively, 0 to 7 grayscales, that is, a total of 8 types of grayscales, may be expressed in the subfields SF21 to SF23 of the first group. Can be. The weight of each subfield SF21 to SF23 of the first group corresponds to the length of one sustain period S21 ₁ , S22 ₁ , S23 ₁ of the corresponding subfield, and corresponds to the length of each subfield SF24 to the second group. The weight of SF2M corresponds to the sum of the lengths of the _eight sustain periods S2N _{1 to} S2N ₈ (where N is an integer between 4 and M).

In the subfields SF24 to SF2M of the second group, the gray level is expressed by the subfields which are sequentially turned on from the fourth subfield SF24 as described above. Therefore, the gray level in one field may be expressed by the sum of the gray level represented in the subfields SF21 to SF23 of the first group and the gray level represented in the subfields SF24 to SF2M of the second group.

In this case, the light emitting cells are selected from the discharge cells formed by the plurality of row electrodes in one address period without grouping the plurality of row electrodes in the first group subfields SF21 to SF23, and then emit light for one sustain period. The cells can be sustained discharged. However, since the light emitting cells selected earlier in time among the plurality of row electrodes are sustained and discharged in the sustaining period after a longer time elapses compared to the other light emitting cells, in such light emitting cells, priming formed by the address discharge before the sustaining period is performed. Since the particle and / or wall charge may be erased by a certain amount, sustain discharge may occur unstable in the sustain period.

In the subfields SF21 to SF23 of the first group, the plurality of row electrodes may be divided into a plurality of row groups as in the first embodiment. However, if a plurality of row electrodes are divided into row groups, the holding periods must be performed for each row group, so that the total length of the holding period in one subfield is long, thereby limiting the number of subfields that can be used in one field.

However, when the plurality of row electrodes are divided and driven as two row groups as in the second embodiment of the present invention, the address discharge may be prevented from being unstable due to the erasing of priming particles and / or wall charges. The number of sustain periods in the subfields SF21 to SF23 can be reduced as compared with the first embodiment.

FIG. 6 is a diagram illustrating a gray scale expression method according to the driving method of FIG. 5. In FIG. 6, one field is composed of 34 subfields. It is assumed that there are three subfields SF21 to SF23 of the first group and 31 subfields SF21 to SF2M of the second group.

As shown in Fig. 6, when the total number of subfields SF24 to SF2M of the second group is 31, a total of 32 gray scales from 0 to 31 gray scales can be expressed. If the length of each holding period of the subgroups SF24 to SF2M of the second group is set equal to the length of the holding period S21 _i of the minimum weighting subfield SF21 of the first group, The weights of the subfields SF24 to SF2M correspond to eight. Accordingly, gray scales corresponding to multiples of 8 may be expressed in the 0 to 248 (= 8 x 31) grays in the subfields SF24 to SF2M of the second group. Since the 0th to 7th gradations can be represented by the subfields SF21 to SF23 of the first group, the gradation from 0th to 255 (= is achieved by the combination of the subfields SF21 to SF2M of the first group and the second group. 248 + 7) Up to gradation can be expressed.

On the other hand, in the second embodiment of the present invention, two sustain periods of the same length are formed twice in each subfield SF21 to SF23 of the first group, but differently to each subfield SF21 to SF23 of the first group. An embodiment in which the total length of the period can be reduced compared to the second embodiment will be described with reference to FIGS. 7 and 8.

7 is a view schematically illustrating a method of driving a plasma display device according to a third embodiment of the present invention.

As shown in FIG. 7, the driving method according to the third embodiment of the present invention is similar to the second embodiment. However, the third embodiment, the wall charges formed in the discharge cell of the second embodiment, unlike the example, each group of rows, each row group in the sustain period at the end of the _{(G 11, G 12) (} G 11, G 12) Do not perform an erase operation for erasing.

Specifically, in the address period WA31 ₁ of the first subfield SF31, the discharge cells set as the light emitting cells of the discharge cells of the first row group G ₁₁ are write-discharged to form wall charges, and the sustain period S31 _1. ) Sustains discharge of the light emitting cells of the first row group G ₁₁ . At this time, in the sustain period S31 ₁ , a minimum sustain discharge, for example, is set such that only one or two sustain discharges occur.

Subsequently, in the address period WA31 ₂ of the first subfield SF31, the discharge cells set as the light emitting cells of the discharge cells of the second row group G ₁₂ are write-discharged to form wall charges, and the sustain period S31 ₂ . The light emitting cells of the first and second row groups G ₁₁ and G ₁₂ are sustained and discharged in a part of period S31 ₂₁ . In the sustain period S31 ₂ , only the light emitting cells of the second row group G ₁₂ are sustained and discharged in a state in which the light emitting cells of the first row group G ₁₁ are set so that sustain discharge is not generated in the remaining partial periods S31 ₂₂ . In the light emitting cells of the first row group G ₁₁ , sustain discharge is not performed. At this time, the sustain period (S31 ₂₎ of the remaining part of the period (S31 ₂₂₎ the second row group (G ₁₂₎ the first line group from the number of times that sustain discharge occurs in the light emitting cells are sustain period (S31 ₁₎ of the (G ₁₁₎ It is set to be equal to the number of times a sustain discharge occurs in the light emitting cell of.

In addition, when the weights of the first subfield SF31 are not satisfied by the two sustain periods S31 ₁ and S31 ₂ , the first and second rows in the remaining partial period S31 ₂₂ of the sustain period S31 ₂ . The light emitting cells of the groups G ₁₁ and G ₁₂ can be further sustained discharged. In this manner, the address periods and the sustain periods WA32 ₁ , S32 ₁ , WA32 ₂ , S32 ₂ , WA33 ₁ , S33 ₁ , WA33 ₂ , and S33 ₂ of the second and third subfields SF32 and SF33 are sequentially. Proceed.

At this time, the weight of each subfield SF31 to SF33 of the first group corresponds to the sustain periods S31 ₂ , S32 ₂ , and S33 ₂ , and the weight of each subfield SF34 to SF3M of the second group is 8 pieces. Corresponds to the sum of the retention periods.

FIG. 8 illustrates driving waveforms of a specific plasma display device according to the driving method of FIG. 7. In FIG. 8, only the first subfield SF21 is shown in the first group of subfields SF1 to SF3 for convenience of description, and a driving waveform applied to the A electrode is not shown. The description of the driving waveform applied to the A electrode is also omitted.

As shown in FIG. 8, in the reset period R31, the reset waveform described in FIG. 3 is applied to the Y electrode and the X electrode of the first and second row groups G ₁₁ and G ₁₂ to initialize all discharge cells. It is set to a light emitting cell.

In the address period WA31 ₁ , with the voltage Vs applied to the X electrodes of the first and second row groups G ₁₁ and G ₁₂ and the voltage VscH applied to the Y electrode of the second row group G ₁₂ , Scan pulses of a VscL voltage are sequentially applied to the plurality of Y electrodes of the first row group G ₁₁ . At this time, an address pulse (not shown) having a positive voltage is applied to the A electrode of the light emitting cell among the discharge cells formed by the Y electrode to which the scan pulse is applied. Then, a write discharge occurs in the discharge cell to which the VscL voltage of the scan pulse and the positive voltage of the address pulse are applied, and wall charges are formed on the X and Y electrodes, and the wall voltage by the wall charges is formed to be a light emitting cell. The Y electrode to which the scan pulse is not applied applies a VscH voltage higher than the VscL voltage, and a reference voltage is applied to the A electrode to which the positive voltage of the address pulse is not applied, although not shown.

In the sustain period S31 ₁ , a sustain discharge pulse of a Vs voltage is applied to the Y electrodes of the first and second row groups G ₁₁ and G ₁₂ to sustain discharge the light emitting cells. In FIG. 8, one sustain discharge pulse is applied to the Y electrodes of the first and second row groups G ₁₁ and G ₁₂ . At this time, since the first address period (WA31 ₁₎ cells only the light emitting cells is caused address discharge in the line group (G _11), the first place to maintain only a single light-emitting discharge cells of a row group (G _11).

Next, in the address period WA31 ₂ , the voltage Vs is applied to the X electrodes of the first and second row groups G ₁₁ and G ₁₂ , and the voltage VscH is applied to the Y electrode of the first row group G ₁₁ . In the second row group G ₁₂ , a plurality of Y electrodes are sequentially applied with scan pulses of a VscL voltage to write-discharge the discharge cells set as the light emitting cells among the discharge cells of the second row group G ₁₂ , and thereby wall discharge. To form.

In the period S31 ₂₁ of the sustain period S31 ₂ , a reference voltage is applied to the X electrodes of the first and second row groups G ₁₁ and G ₁₂ , and the first and second row groups G ₁₁ ,. The sustain discharge pulse of the voltage Vs is applied to the Y electrode of G ₁₂ ). In this case, the first and second groups of rows, so the wall charges in the light emitting cells are formed all at the same time maintained at the light emitting cells of the first and second row groups (G _11, G ₁₂₎ the discharge of the (G _11, G ₁₂₎ is Happens.

Subsequently, in order to make the number of sustain discharges of the first and second row groups G ₁₁ and G _{12 the} same in the remaining partial period S31 ₂₂ of the sustain period S31 ₂ , the first and second row groups G ₁₁ , the sustain discharge pulse of the voltage Vs is applied to the X electrodes of G ₁₂ , and the voltage Vs1 lower than the voltage Vs is applied to the plurality of Y electrodes of the first row group G ₁₁ and the second row group G ₁₂ Vs voltage is applied to the plurality of Y electrodes. At this time, sustain discharge occurs in a partial period S31 ₂₁ of the sustain period S31 ₂ so that negative wall charges are formed on the Y electrodes of the first and second row groups G ₁₁ and G ₁₂ , and Since a positive wall charge is formed at the X electrodes of the two row groups G ₁₁ and G ₁₂ , sustain discharge occurs only in the light emitting cells of the second row group G ₁₂ , and the first row group G ₁₁ . In the light emitting cell, no discharge occurs. As a result, the number of sustain discharges in the first and second row groups G ₁₁ and G ₁₂ in the first subfield SF21 becomes equal. In this case, when the weight assigned to the first subfield SF21 is not satisfied, the Y of the first and second row groups G ₁₁ and G _{12 in} the remaining partial period S31 ₂₂ of the sustain period S31 ₂ . The sustain discharge pulses of the voltage Vs are applied to the electrodes and the X electrodes in opposite phases, respectively, to further sustain discharge the light emitting cells of the first and second row groups G ₁₁ and G ₁₂ . In this manner, the weight of the first subfield SF21 may be implemented.

Meanwhile, in FIG. 8, in order to make the number of sustain discharges of the first and second row groups G ₁₁ and G _{12 the} same in the remaining partial period S31 ₂₂ of the sustain period S31 ₂ , the first row group G Although it is shown that the voltage Vs1 lower than the voltage Vs is applied to the plurality of Y electrodes ₁₁ ), the voltage Vs may be applied. At this time, even when the voltage Vs is applied, no discharge occurs in the light emitting cells of the first row group G ₁₁ .

In the second and third embodiments of the present invention, although the subfields SF21 to SF23 and SF31 to SF33 of the first group are shown in front of the subfields SF24 to SF2M and SF34 to SF3M of the second group, The subfields SF21 to SF23 and SF31 to SF33 of the first group may be located after the subfields SF24 to SF2M and SF34 to SF3M of the second group.

Further, in the first to third embodiments of the present invention, the erase periods ER1 _{2 to} ER1 ₈ , ER2 _{2 to} ER2 ₈ , ER3 _{2 to} ER3 ₈ and additional holding in the last subfield SF1L, SF2M, SF3M of one field Although the periods SA1 _{2 to} SA1 ₈ , SA2 _{2 to} SA2 ₈ , and SA3 _{2 to} SA3 ₈ are formed, they may be deleted. When the erasing periods (ER1 _{2 to} ER1 ₈ , ER2 _{2 to} ER2 ₈ , ER3 _{2 to} ER3 ₈ ) and the additional holding periods (SA1 _{2 to} SA1 ₈ , SA2 _{2 to} SA2 ₈ , SA3 _{2 to} SA3 ₈ ) are deleted, You can change the addressing order of each row group through the fields of. Then, the number of sustain discharges in each row group can be the same.

Although the 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 present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the exemplary embodiment of the present invention, since the address period is formed between the sustain periods of each row group, the priming particles formed in the sustain period can be sufficiently utilized in the address period. You can do

In another embodiment of the present invention, a plurality of subfields are divided into a plurality of subfield groups in one field, and the first subfield group includes a plurality of subfields having respective weights and selects light emitting cells by selective writing. The second subfield group includes a plurality of subfields having the same weight, and at least one subfield positioned at the head in time selects the light emitting cells by the selective writing method, and the remaining subfields are the light emitting cells by the selective erasing method. Selects a non-emitting cell. This increases the number of gradations that can be expressed than in the field consisting of the second subfield group.

In addition, sustain discharge can be stably performed by dividing and driving the plurality of row electrodes into two row groups in the first subfield group, and one sub-group compared to driving the plurality of row electrodes into three or more row groups. The length of the total retention period in the field can be reduced.

Claims (15)

In a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells defined by the row electrode and the column electrode, the method of driving one field divided into a plurality of subfields, Dividing the plurality of subfields into a plurality of subfield groups including first and second subfield groups; Dividing the plurality of row electrodes into a first row group and a second row group in the first subfield group; In each subfield of the first subfield group, selecting a light emitting cell among the discharge cells of the first row group during a first address period, and sustaining and discharging the light emitting cells of the first row group during a first sustain period , In each of the subfields of the first subfield group, light emitting cells are selected from discharge cells of the second row group during a second address period, and sustain discharge of the light emitting cells of the second row group is performed during a second sustain period. step, Dividing the plurality of row electrodes into a plurality of row groups including at least three row groups in the second subfield group; Selecting, in each subfield of the second subfield group, a non-light emitting cell among light emitting cells of each row group during a third address period for each row group of the plurality of row groups, and In each subfield of the second subfield group, sustaining and discharging a discharge cell in a light emitting cell state of the plurality of row groups for a third sustaining period located between two adjacent third address periods, And the second subfield group is located behind the first subfield group. The method of claim 1, The plurality of subfield groups further includes a third subfield group, which is temporally preceding the second subfield group and includes the plurality of row groups in the same number as the second subfield group. The driving method, Selecting a light emitting cell among discharge cells of each row group in a fourth address period for each row group of the plurality of row groups in each subfield of the third subfield group, and In each subfield of the third subfield group, sustaining and discharging a discharge cell in a light emitting cell state of the plurality of row groups during a fourth sustaining period located between two adjacent fourth address periods; A method of driving a plasma display device. The method of claim 2, And sustaining discharge of the light emitting cells of the first row group when the light emitting cells of the second row group are sustained discharged in the first period of the second sustain period. The method of claim 3, Sustain discharge of the light emitting cells of the second row group in the second sustain period, The light emitting cells of the second row group are sustained and discharged while the light emitting cells of the first row group are set not to sustain discharge in a second period of the second sustain period, and the light emitting cells of the first row group are held. Not discharging, and And sustain-discharging the light emitting cells of the first and second row groups in the first period of the second sustain period. The method of claim 2, And the light emitting cells of the first row group are not sustained discharged when the light emitting cells of the second row group are sustained discharged in the second sustain period. The method of claim 2, In each subfield of the first and third subfield groups, setting the plurality of discharge cells as non-light emitting cells before selecting the light emitting cells. The method of claim 2, In a subfield located last in time of the second subfield group, after the last last sustain period in time, Setting the light emitting cells of each row group to non-light emitting cells during an erase period for each row group of the plurality of row groups, and And sustain-discharging the discharge cells in the light-emitting cell state of the plurality of row groups during a fifth sustain period positioned between two adjacent erasing periods. In a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells defined by the row electrode and the column electrode, the method of driving one field divided into a plurality of subfields, Dividing the plurality of subfields into a plurality of subfield groups including first and second subfield groups; Dividing the plurality of row electrodes into a first row group and a second row group in the first subfield group; In each subfield of the first subfield group, selecting a light emitting cell among the discharge cells of the first row group and sustain-discharging the light emitting cells of the first row group; In each of the subfields of the first subfield group, selecting a light emitting cell among the discharge cells of the second row group and sustain-discharging the light emitting cells of the second row group; Dividing the plurality of row electrodes into a plurality of row groups including at least three row groups in the second subfield group; In the first subfield located temporally in the second subfield group, light emitting cells are selected from discharge cells of a third row group among the plurality of row groups, and light emitting cells of the third row group are sustained and discharged. Steps, In the first subfield, selecting light emitting cells from discharge cells of a fourth row group among the plurality of groups, and sustain discharge of the light emitting cells of the fourth row group; Selecting a non-light emitting cell among the light emitting cells of the third row group in the second subfield of the second subfield group, sustaining and discharging the remaining light emitting cells of the third row group, and In the second subfield, selecting a non-light emitting cell among the light emitting cells of the fourth row group, and sustain discharge of the remaining light emitting cells of the fourth row group. The method of claim 8, In each subfield of the first subfield group, the light emitting cells of the first row group are not sustained discharged during a partial period of time when the light emitting cells of the second row group are sustained and discharged. The method of claim 9, And in each of the subfields of the first subfield group, the light emitting cells of the first row group are sustained and discharged during the remaining partial periods of the light emitting cells of the second row group. The method of claim 8, And the light emitting cells of the third row group are sustained and discharged when the light emitting cells of the fourth row group are sustained and discharged in the first and second subfields. The method of claim 11, After the light emitting cells of the last row group of the plurality of row groups are sustained and discharged in the third subfield that is located last in the second subfield group in time, Setting the light emitting cells of the third row group to non-light emitting cells, and then sustain-discharging the light emitting cells of the remaining row groups; and And setting the light emitting cells of the fourth row group to be non-light emitting cells, and then sustain-discharging the light emitting cells of the remaining row groups. A plasma display panel including a plurality of row electrodes for performing a display operation and a plurality of column electrodes formed in a direction crossing the row electrodes, wherein a plurality of discharge cells are formed by the plurality of row electrodes and the plurality of column electrodes , Dividing the plurality of subfields into a plurality of subfield groups including first and second subfield groups, dividing the plurality of row electrodes into a first row group and a second row group in the first subfield group, A controller for dividing the plurality of row electrodes into a plurality of row groups including at least three row groups in the second subfield group; and In each subfield of the first subfield group, light emitting cells of the first row group are selected during a first address period, light emitting cells of the second row group are selected during a second address period, and the second subfield group is selected. A driver configured to select a non-light emitting cell among light emitting cells of each row group during a third address period for each row group of the plurality of row groups in each subfield of And the second subfield group is located behind the first subfield group. The method of claim 13, The driving unit, In each subfield of the first subfield group, the light emitting cells of the first row group are sustained and discharged for a first sustain period that is successively temporal to the first address period, and is continuously temporally connected to the second address period. Sustain discharge the light emitting cells of the second row group during a second sustain period, And discharge cells in the light emitting cell states of the plurality of row groups in a third sustain period between two adjacent third address periods in each subfield of the second subfield group. The method of claim 14, The plurality of subfield groups are sequentially temporally preceding the second subfield group, and include the plurality of row groups in the same number as the second subfield group, The driving unit, In each subfield of the third subfield group, a light emitting cell of the discharge cells of each row group is selected during a fourth address period for each row group of the plurality of row groups, And discharging the discharge cells in the light emitting cell states of the plurality of row groups in a fourth sustain period located between two adjacent fourth address periods in each subfield of the third subfield group.

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