KR100627421B1 - Plasma display device and driving method thereof - Google Patents

Abstract

In the plasma display device, the cells constituting the display panel are driven separately by electrode lines, thereby minimizing the temporal gap between the address period and the sustain period so that a smooth sustain discharge occurs in the sustain period.

In addition, according to the present invention, by using the selective writing method and the selective erasing method in the address period of each subfield, high-speed addressing is possible as compared with the case of using the selective writing method in all the subfields. Further, by adjusting the timing t1 of the sustain discharge pulse applied to the odd-numbered line scan electrode Yodd in the first subfield using the selective writing method, selective erasing is performed in the second subfield subsequent to the first subfield. By using this method, you can compensate for differences in margin characteristics that may occur.

PDP, address / hold mix period, sustain discharge, write, erase

Description

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

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

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 schematically illustrating a subfield in a method of driving a plasma display device according to an exemplary embodiment of the present invention.

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

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

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

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

In general, a plasma display device divides one frame into a plurality of subfields SF1-SF8 having respective weights (1T, 2T, 4T, 8T, 16T, 31T, 64T, and 128T) and time-divisionally controls them to implement gradation. Each subfield SF1-SF8 includes an address period Ad1-Ad8 and a sustain period S1-S8. The address period is a period for selecting a cell to be turned on and a cell that is not turned on in the panel, and the sustain period is a period during which a discharge for actually displaying an image in the addressed cell is applied by applying a sustain discharge voltage pulse.

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

As shown in FIG. 1, the conventional method of driving a plasma display device sequentially completes an address operation from the first scan electrode line Y1 to the last scan electrode line Yn, and then simultaneously holds the selected cell in the sustain period. It is to perform the discharge operation. According to such a driving method, after an address operation is performed on one scan electrode line, the sustain discharge operation in the scan electrode line is performed only after the address operation of the last scan electrode line is completed. Therefore, there is a problem that a significant time gap occurs until the sustain discharge operation occurs in the cell in which the address operation has occurred, and the sustain discharge operation may become unstable.

In addition, when all the address periods of the plurality of subfields forming one frame are formed by the selective writing method, the scan pulses and the address pulses must have a predetermined width such that the wall voltage is formed in the light emitting cells. Therefore, there is a problem that the high-speed address becomes impossible because the address period becomes long.

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 reducing a time gap between an address operation and a sustain discharge operation.

Another object of the present invention is to provide a plasma display device and a driving method thereof capable of correcting a difference in margin characteristics during high-speed driving of the plasma display device.

According to an aspect of the present invention, a driving method of a 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 first electrode and the second electrode. In a plasma display device including an electrode, and a discharge cell is formed by the plurality of first, second and third electrodes, one frame is divided into a plurality of subfields.

The plurality of first electrodes are divided into a plurality of groups, and a first subfield of the plurality of subfields includes a plurality of address periods and a plurality of sustain periods respectively corresponding to the plurality of groups,

The first sustain period of the plurality of sustain periods is located after the latest address period of the plurality of address periods.

During the first period of the first sustain period, after applying a first voltage and a second voltage lower than the first voltage to the first electrode and the plurality of second electrodes of the first group of the plurality of groups, respectively, Applying the first voltage and the second voltage to the plurality of second electrodes and the first electrode of the first group, respectively, and during the second period of the first sustain period, the first electrode of the first group And applying the first voltage and the second voltage to the plurality of second electrodes and the first voltage of the second group of the plurality of groups during the third period of the first sustain period. After applying a high third voltage, applying a fourth voltage lower than the third voltage and in an address period of a second subfield of the plurality of subfields, to a non-light emitting cell of light emitting cells of the first subfield. To the first electrode and the third electrode corresponding to the cell to be selected. And a step for applying each of the first scan pulse and a first address pulse,

The third period is longer than the first period and is shorter than the sum of the first period and the second period.

According to another aspect of the present invention, a 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 first electrode and the second electrode. A plasma display panel in which discharge cells are formed by first, second, and third electrodes; The plurality of first electrodes are divided into a plurality of groups, one frame is divided into a plurality of subfields, and a first subfield of at least one subfield among the plurality of subfields respectively corresponds to the plurality of groups. A control unit for setting a plurality of address periods and a plurality of sustain periods; And applying a first voltage and a second voltage lower than the first voltage to first electrodes of the first group and the second electrodes of the plurality of groups during the first period of the first sustain period. And applying the first voltage and the second voltage to the plurality of second electrodes and the first electrode of the first group, respectively.

During the second period of the first sustain period, the first voltage and the second voltage are applied to the first electrode and the plurality of second electrodes of the first group,

Applying a third voltage higher than the second voltage to the first electrodes of the second group of the plurality of groups during the third period of the first sustain period, and then applying a fourth voltage lower than the third voltage,

In an address period of a second subfield among the plurality of subfields, a first scan pulse and a first address pulse are respectively applied to first and third electrodes corresponding to a cell to be selected as a non-light emitting cell among light emitting cells of the first subfield. It includes a drive unit for applying,

The first sustain period of the plurality of sustain periods is located after the latest address period driven among the plurality of address periods, and the third period is longer than the first period and is greater than the sum of the first period and the second period. Short plasma display device.

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. Like parts are designated by like reference numerals throughout the specification.

In addition, the wall charge referred to in the present invention refers to a charge formed close to each electrode on the wall of the cell (eg, the dielectric layer). 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.

A plasma display device and a driving method thereof according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

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 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 A1-Am arranged in the column direction, a plurality of sustain electrodes X1-Xn arranged in the row direction, and a plurality of scan electrodes Y1-Yn. do. 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 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 is represented by a reset period, an address period, and a sustain period. The address electrode driver 300 receives an address drive 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 Y. 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 X.

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, one frame is divided into a plurality of subfields SF1-SF8 having respective weights (8 in FIG. 3), and the scan electrodes Y1-Yn each have k groups ( G1-Gk), where k is an integer of 2 or more. In FIG. 3, the scan electrodes Y 1 to Y n are grouped by a predetermined number in the physical arrangement order to form a group. That is, the scan electrodes Y 1 -Y n / k from the first row to the (n / k) th row form the first group G1, and from the (n / k + 1) th row to the (2n / k) The scan electrodes Yn / k + 1-Y2n / k in the first row form the second group G2. In this manner, the scan electrodes Y (k-1) n / k + 1-Yn in the ((k-1) n / k + 1) th to nth rows form the kth group Gk. do.

Alternatively, scan electrodes Y1 to Yn spaced apart at regular intervals may be bundled into one group. 1, (n / k + 1), (2n / k + 1),... The ((k-1) n / k + 1) th scan electrodes (Y1, Yn / k + 1, Y2, / k + 1, ..., Y (k-1) n / k + 1) are the first group Set to (G1), 2, (n / k + 2), (2m / k + 2),... , ((k-1) n / k + 2) th scan electrodes Y2, Yn / k + 2, Y2n / k + 2, ..., Y (k-1) n / k + 2) G2) can also be set. On the other hand, if necessary, scan electrodes may be grouped in an irregular manner.

4 is a diagram schematically illustrating a predetermined subfield in a method of driving a plasma display device according to an exemplary embodiment of the present invention. In FIG. 4, for convenience of description, the scan electrodes Y1 to Yn are divided into two groups (Yodd and Yeven), that is, an even group consisting of an odd group (Yodd) consisting of odd-numbered scan electrodes (Y) and an even-numbered scan electrode (Y). The case of grouping by (Yeven) is shown.

As shown in Fig. 4, one subfield includes a reset period R, an address / sustain mixing period T1, and a common sustain period T2.

The reset period R is a period of initializing the wall charge state of the cells formed by the scan electrodes Y of all the groups Yodd and Yeven.

In the address / sustain mixing period T1, an address period Aodd is performed for a cell formed by the scan electrode Y of the odd group Yodd (hereinafter, referred to as " cell of odd group "). The cell to be turned on is selected among the cells of (Yodd). Next, a sustain period Sodd for sustain discharge of the cells to be turned on in the odd group Yodd is performed. Subsequently, an address period Aeven is performed for the cells formed by the scan electrodes Y of the even groups Yeven (hereinafter, referred to as "even groups of cells"), and the cells to be turned on among the cells of the even groups Yeven are performed. Is selected. Next, a sustain period Seven to sustain discharge the cells to be turned on in the even group Yeven is performed.

At this time, if the lengths of the two sustain periods (Sodd, Seven) of the address / sustain mixing period T1 are the same, the same number of sustain discharges occur in the cells to be turned on in the odd and even groups. That is, sustain discharge is generated in each cell to be turned on a number of times corresponding to the sum of one sustain period (Sodd or Seven) of the address / sustain mixture period T1 and the common sustain period T2.

On the other hand, the common sustain period T2 can be eliminated when the weight assigned to the subfield is satisfied by the sustain period (Sodd or Seven) of the address / sustain mixture period T1.

In addition, the lengths of the sustain periods (Sodd or Seven) of the address / sustain mixing period T1 are the same in all the subfields, and the weights of the subfields may be implemented by varying the length of the common sustain period T2.

As described above, in the above-described exemplary embodiment of the present invention, the cells constituting the display panel are driven by the electrode lines. For example, the display panel is divided into scan lines Yod of odd lines and scan electrodes Yeven of even lines, and an address operation and a sustain discharge operation are performed on the odd line scan electrodes Yod, and the next even lines The address operation and the sustain discharge operation are performed on the scan electrode Yeven. By doing so, the time taken to perform the address operation on the odd line scan electrode Yodd (or even line scan electrode Yeven) and then the sustain discharge operation is taken for the entire line scan electrodes Y1 to Yn. It takes less than the time it takes to perform the address operation and then the sustain discharge operation. Therefore, it is possible to minimize the temporal gap between the address period and the sustain period, so that smooth sustain discharge can occur in the sustain period.

However, in the case of applying the subfield structure as shown in FIG. 4, when the cell to select the address period of all the subfields is selectively selected, fast addressing may not be performed. In the selective writing method, since the scan pulse and the address pulse must have a predetermined width enough to form wall charges in the light emitting cells, the selective writing method takes some time when the selective writing method is applied to all subfields. As a result, the address period becomes long, so that the high speed address is impossible.

However, since the selective erasing method does not need to form a wall charge, the scan pulse and the address pulse width can be reduced, thereby shortening the address period, thereby enabling a high speed address compared to the selective writing method.

Therefore, the driving method according to the first embodiment of the present invention described below uses the selective erasing method in the address period of some subfields among the plurality of subfields. The selective erasing method is a method of addressing a cell in a light emitting cell state to erase wall charges and setting it as a non-light emitting cell. 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 "erase discharge".

5 is a driving waveform diagram of a plasma display device according to a first embodiment of the present invention. In FIG. 5, only two subfields of the plurality of subfields are illustrated. For convenience, the two subfields are represented as a first subfield and a second subfield, respectively. In the address period of the first subfield, an optional writing method is used. In the address period of the second subfield, a selective erase method is used.

First, as shown in FIG. 5, the first subfield includes a reset period R and an address / sustain mixing period T1.

The reset period R initializes the wall charge state of the cell by applying a reset waveform to all the scan electrodes Yodd and Yeven. When the reset period is composed of a rising period and a falling period, in the rising period of the reset period, a voltage gradually rising from the Vs voltage to the Vset voltage is applied to the scan electrodes Yodd and Yeven to accumulate wall charges in the cell. In the falling period, a voltage gradually falling down to the Vnf voltage is applied to the scan electrodes Yodd and Yeven to remove the wall charges accumulated in the rising period to initialize the wall charge state of the cell. That is, all the discharge cells are initialized and set to the non-light emitting cell state.

In the address / sustain mixing period T1, first, an address period Aodd and a sustain period Sodd for the odd line group Yodd of the scan electrode are performed. Next, the address period Aeven and the sustain period Seven of the even line group Yeven are performed. In each of the address periods Aodd and Aeven, the cell in the non-light emitting cell state is set to the light emitting cell state by writing discharge to form a wall charge.

In the address period Aodd of the odd line scan electrode Yodd in the address / sustain mixing period T1, VscL1 is sequentially applied to the odd line scan electrode Yodd while the even line scan electrode Yeven is maintained at the VscH1 voltage. A scan pulse with a voltage is applied. Although not shown, an address voltage is applied to an address electrode forming a cell to be displayed among cells formed by the scan electrode Yodd to which the scan pulse VscL1 is applied. Then, the address discharge occurs due to the difference between the address voltage applied to the address electrode and the voltage VscL1 applied to the scan electrode Yodd and the wall voltage caused by the wall charges formed on the address electrode and the scan electrode Yodd, thereby providing a suitable wall for sustain discharge. The voltage Vwxy is formed.

In the sustain period Sodd of the address / sustain mixing period T1, a sustain discharge pulse is applied to the scan electrodes Yodd and Yeven and the sustain electrode X alternately. In FIG. 5, one sustain discharge pulse is applied to the scan electrodes Yodd and Yeven and the sustain electrode X, respectively. The sustain discharge pulse has a high level voltage (Vs voltage in FIG. 5) and a low level voltage (0V voltage in FIG. 5), and the Vs voltage is a voltage capable of causing sustain discharge along with the wall voltage. First, a Vs voltage is applied to the scan electrodes Yod and Yeven and 0 V is applied to the sustain electrode X, and a wall is formed between the scan electrode Yodd and the sustain electrode X by the address discharge in the address period Aodd. In the cell in which the voltage is formed, sustain discharge occurs due to the wall voltage and the voltage difference Vs between the scan electrode Yodd and the sustain electrode X, so that the wall voltages having opposite polarities are applied to the scan electrode Yodd and the sustain electrode X. Is formed. On the other hand, while the sustain discharge pulse is also applied to the even-line scan electrode Yeven during the sustain period Sodd of the address / sustain mixing period T1, a wall voltage suitable for sustain discharge is generated between the scan electrode Yeven and the sustain electrode X. Since it is not formed, no sustain discharge occurs.

As such, when the address period Aodd and the sustain period Sod of the address / sustain mixing period T1 are completed for the odd line scan electrode Yodd, the address / sustain mixing period T1 is applied to the even line scan electrode Yeven. Address period Aeven is performed.

For the even line scan electrode Yeven, in the address period Aeven of the address / sustain mixing period T1, the VscL1 voltage is sequentially applied to the scan electrode Yeven while the odd line scan electrode Yodd is maintained at the VscH1 voltage. A scan pulse having is applied. At this time, the voltage VscH1 is also applied to the even line scan electrode Yeven to which the scan pulse is not applied. As described above, an address voltage is applied to an address electrode forming a cell to be displayed among cells formed by the scan electrode Yeven to which the VscL1 voltage is applied, thereby forming a wall voltage.

In the sustain period Seven of the address / sustain mixing period T1, a sustain discharge pulse having an alternating Vs voltage and a 0V voltage is applied to the even-line scan electrode Yeven and the sustain electrode X. Then, sustain discharge occurs in a cell in which the wall voltage is formed in the address period Aeven among the cells of the even-line scan electrode Yeven. Meanwhile, in the sustain period Seven, one sustain discharge occurs in the odd line scan electrode Yodd while three sustain discharges occur in the even line scan electrode Yeven. To this end, the sustain discharge pulse having the voltage Vs is applied to the odd line scan electrode Yodd while the sustain discharge pulse having the Vs voltage and the 0V voltage is alternately applied to the even line scan electrode Yeven. Then, in the odd-numbered line scan electrode Yodd, the voltage difference between the scan electrode Yodd and the sustain electrode X does not reach the discharge start voltage Vf after the first sustain discharge. There is no second sustain discharge, and since the wall voltage is formed in reverse polarity, no subsequent sustain discharge occurs.

Therefore, in the first subfield of FIG. 5, four discharges are performed in the same manner as in the odd line scan electrode Yodd and the even line scan electrode Yeven.

In this manner, the number of sustain discharges in the odd line scan electrode Yodd during the sustain period Seven of the even line scan electrode Yeven is limited to the number of sustain discharges in the sustain period Sodd so that the odd line scan electrode ( Yodd) and the luminance of the even line scan electrode Yeven can be equally matched.

Next, in the second subfield, a cell to be set as a non-light emitting cell is selected from the light emitting cells set in the first subfield. Since the wall charges are sufficiently formed in the light emitting cells in the first subfield due to sustain discharge, the wall charges of the cells set as non-light emitting cells among the light emitting cells are erased in the address period of the second subfield.

Specifically, in the state where the reference voltage is applied to the sustain electrode X in the address period of the second subfield, the scan pulse of the VscL2 voltage, which is a negative voltage, is sequentially applied to the scan electrode Y. At this time, an address pulse having a positive voltage is applied to the address 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 on the scan electrode Y to which the scan pulse is applied. The unselected scan electrode Y is biased to the VscH2 voltage, which is a positive voltage higher than the VscL2 voltage, and a reference voltage is applied to the unselected address electrode. In this case, when the Va voltage of the first subfield is used as a positive voltage applied to the address electrode as described above, additional power may be reduced. The voltage VscL2 is set to have a voltage higher than the voltage VscL1 in order to prevent discharge from occurring in the cell set as the non-light emitting cell in the first subfield.

Then, erase discharge occurs in the light emitting cell to which the scan electrode Y to which the scan pulse of the VscL2 voltage is applied and the address pulse to the Va voltage are applied, thereby erasing the wall voltages formed on the sustain electrode X and the scan electrode Y. The non-light emitting cell is set.

In the light emitting cells of the first subfield, since the cells in which the erase discharge has not occurred in the address period of the second subfield are light emitting cells of the second subfield, the Vs voltage is first applied to the sustain electrode X in the sustain period of the second subfield. Is applied to generate a sustain discharge in the light emitting cell, and then a voltage of 0 V is applied to the scan electrode Y to generate a sustain discharge in the light emitting cell. The alternately applying the Vs voltage and the 0V voltage to the scan electrode Y and the sustain electrode X is repeated a number of times corresponding to the weight indicated by the second subfield. At this time, the sustain period is terminated after the last sustain discharge occurs due to the Vs voltage being applied to the sustain electrode X.

The address periods of the subsequent subfields SF3 to SF8 may be performed by a selective erase method. In addition, after the plurality of selective write subfields are continued, a plurality of selective erasure subfields may be continued.

On the other hand, in the plasma display device using the selective erasing method in the address period of some subfields among all the subfields, in particular, the address of the second subfield subsequent to the first subfield using the selective writing method as shown in FIG. The following problems occur in the plasma display device using the selective erasing method in the period.

That is, in order to equalize the luminance difference between the odd line scan electrode Yod and the even line scan electrode Yeven in the first subfield using the selective write method in the address period, the Vs voltage and the even line scan electrode Yeven are equal to each other. During the three sustain discharges by alternately applying the 0 V voltage, the odd line scan electrode Yodd biases the Vs voltage to limit the number of sustain discharges of the odd line scan electrode Yodd. At this time, as the time when the Vs voltage is biased in the odd line scan electrode Yodd becomes longer, the negative charge among the space charges is attracted to the odd line scan electrode Yodd. That is, after the kind of the sustain period Seven, the odd line scan electrode Yodd attracts more negative wall charge than the even line scan electrode Yeven. Due to the large negative wall charges formed on the odd line scan electrode Yodd, the address electrode and the odd line scan electrode do not need to be applied to the address electrode in the address period of the second subfield using the selective erasure method. The discharge occurs between the A-Yodd, and thus a difference in margin characteristics occurs between the scan electrode group Yodd of the odd line and the scan electrode group Yeven of the even line.

Therefore, in the second embodiment of the present invention described below, the margins of the odd line scan electrode Yodd and the even line scan electrode Yeven in the address period of the subfield in which the selective erasure is performed subsequent to the subfield in which the selective writing is performed are performed. We propose a method for correcting the difference of characteristics.

As shown in FIG. 6, the driving waveform according to the second exemplary embodiment of the present invention except for the method of applying the sustain discharge pulse applied to the odd line scan electrode Yodd in the sustain period Seven of the first subfield. Same as the first embodiment.

In detail, during the sustain period Seven of the first subfield to which the selective writing method is applied, the Vs voltage and the 0V voltage are alternately applied to the odd line scan electrode Yodd while the Vs voltage and the 0V voltage are alternately applied. The application timing t1 of the sustain discharge pulse is adjusted. In this case, the application timing of the sustain discharge pulse is such that the number of discharges of the odd-numbered line scan electrode Yodd and the even-numbered line scan electrode Yeven is the same, and after the sustain period Seven, the odd-numbered line and even-numbered line scan electrodes Yodd, The value of t1 is appropriately selected so that the amount of negative wall charges accumulated in Yeven) is similar. For example, as shown in Fig. 6, the application timing t1 of the sustain discharge pulse applied to the odd line scan electrode Yodd is appropriately reduced. That is, as shown in FIG. 6, after the Vs voltage and the 0V voltage are applied to the even line scan electrode Yeven and the sustain electrode X, the sustain electrode X and the even line scan electrode Yeven, respectively. A period in which the Vs voltage and the 0 V voltage are applied to the first period is referred to as a first period, and a period in which the Vs voltage and the 0 V voltage are applied to the even line scan electrode Yeven and the sustain electrode X, respectively, is referred to as a second period. The application timing t1 of the sustain discharge pulse applied to the odd line scan electrode Yodd is longer than the first period and shorter than the sum of the first period and the second period. In this case, a voltage Vs is applied to the odd line scan electrode Yodd and a voltage of 0 V is applied to the sustain electrode X to generate one sustain discharge, and then the voltages of the odd line scan electrode Yodd and the sustain electrode X are applied. The sustain discharge does not occur because the difference Vs-Vs does not reach the discharge start voltage, and since the sustain discharge does not occur before, the wall voltage is formed to be reverse polarity, so that the odd line scan electrode Yodd and the sustain electrode X are No maintenance discharge occurs in the liver.

Meanwhile, Vs voltage and 0V voltage are alternately applied between the even line scan electrode Yeven and the sustain electrode X to generate three sustain discharges, and the odd line scan electrode Yodd and the even line scan are performed in the first subfield. The number of sustain discharges of each of the electrodes Yeven may equally match the luminance between the two groups Yod and Yeven three times. Further, by reducing the application timing t1 of the sustain discharge pulse applied to the odd line scan electrode Yodd than the first embodiment, the time for pulling the negative wall charges on the odd line scan electrode Yodd is reduced and the even line is reduced. It is similar to the amount of negative wall charges accumulated on the scan electrode Yeven.

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.

As described above, according to the present invention, the cells constituting the display panel are driven by the electrode lines, thereby minimizing the temporal gap between the address period and the sustain period so that a smooth sustain discharge can occur in the sustain period. .

In addition, according to the embodiment of the present invention, by using the selective writing method and the selective erasing method in the address period of each subfield, a high-speed address is possible, and the selective writing method as compared to the case of using the selective writing method in all the subfields. The difference in the margin characteristics that may occur when the selective erasure method is used in the second subfield subsequent to the first subfield using s may be corrected.

Claims (12)

A plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, wherein the plurality of first, second, and third electrodes In the method of driving by dividing a frame into a plurality of subfields in a plasma display device in which discharge cells are formed, The plurality of first electrodes are divided into a plurality of groups, and a first subfield of the plurality of subfields includes a plurality of address periods and a plurality of sustain periods respectively corresponding to the plurality of groups, The first sustain period of the plurality of sustain periods is located after the latest address period of the plurality of address periods. During the first period of the first sustain period, after applying a first voltage and a second voltage lower than the first voltage to the first electrode and the plurality of second electrodes of the first group of the plurality of groups, respectively, Applying the first voltage and the second voltage to the plurality of second electrodes and the first electrode of the first group, respectively; Applying the first voltage and the second voltage to the first electrode and the plurality of first electrodes of the first group during the second period of the first sustain period; Applying a third voltage higher than the second voltage to a second electrode of a second group of the plurality of groups during the third period of the first sustain period, and then applying a fourth voltage lower than the third voltage ; In an address period of a second subfield among the plurality of subfields, a first scan pulse and a first address pulse are respectively applied to first and third electrodes corresponding to a cell to be selected as a non-light emitting cell among light emitting cells of the first subfield. Approving a, And the third period is longer than the first period and shorter than a sum of the first period and the second period. The method of claim 1, The first electrode of the first group is an even-numbered electrode among the plurality of first electrodes, and the second electrode of the second group is an odd-numbered electrode of the plurality of first electrodes. The method of claim 1, And the third voltage is equal to the first voltage. The method of claim 1, And a sustain discharge does not occur between the first group of the second group and the plurality of second electrodes in the second period. The method of claim 1, And the fourth voltage is the same as the second voltage. The method of claim 1, And wherein the second subfield is continuous to the first subfield. The method of claim 1, In each of the plurality of address periods, a second scan pulse lower than the first scan pulse and a second scan pulse lower than the first address pulse are respectively applied to the plurality of first and third electrodes of a cell to be selected as a light emitting cell among the plurality of cells. A method of driving a plasma display device that applies two address pulses. A plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, wherein the plurality of first, second, and third electrodes A plasma display panel in which discharge cells are formed, The plurality of first electrodes are divided into a plurality of groups, one frame is divided into a plurality of subfields, and a first subfield of at least one subfield among the plurality of subfields respectively corresponds to the plurality of groups. A control unit for setting a plurality of address periods and a plurality of sustain periods; And During the first period of the first sustain period, after applying a first voltage and a second voltage lower than the first voltage to the first electrode and the plurality of second electrodes of the first group of the plurality of groups, respectively And applying the second voltage and the first voltage to the plurality of second electrodes and the first electrode of the first group, respectively. During the second period of the first sustain period, the first voltage and the second voltage are applied to the first electrode and the plurality of second electrodes of the first group, Applying a third voltage higher than the second voltage to a second electrode of a second group of the plurality of groups during the third period of the first sustain period, and then applying a fourth voltage lower than the third voltage, In an address period of a second subfield among the plurality of subfields, a first scan pulse and a first address pulse are respectively applied to a first electrode and a third electrode corresponding to a cell to be selected as a non-light emitting cell among light emitting cells of the first subfield. It includes a drive unit for applying, The first sustain period of the plurality of sustain periods is located after the latest address period driven among the plurality of address periods, and the third period is longer than the first period and is greater than the sum of the first period and the second period. Short plasma display device. The method of claim 8, The first electrode of the first group is an even-numbered electrode of the plurality of first electrodes, and the second electrode of the second group is an odd-numbered electrode of the plurality of first electrodes. The method of claim 8, And the third voltage is the same as the second voltage. The method of claim 8, And the second subfield is continuous to the first subfield. The method of claim 8, In each of the plurality of address periods, a second scan pulse lower than the first scan pulse and a second scan pulse lower than the first address pulse are respectively applied to the plurality of first and third electrodes of a cell to be selected as a light emitting cell among the plurality of cells. A plasma display device applying two address pulses.

Images