KR20080013532A - Driving method of plasma display - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to reduce an EMI(ElectroMagnetic Interference) by decreasing the number of switching operations which apply voltages to address electrodes. A plasma display device includes plural scan electrodes(Y1-Yn) and plural address electrodes(A1-Am). The address electrodes are formed in a direction normal to the scan electrodes. During an address period, a first discharge cell is turned on. The first discharge cell is turned on for the last time among the discharge cells which are formed on an n-th address electrode. While the first discharge cell is scanned, a first voltage is applied to the n-th address electrode. During an application of the first voltage and a portion of a predetermined interval, the n-th address electrode is maintained at the first voltage.

Description

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

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

2 illustrates a driving waveform of the plasma display device according to the first embodiment of the present invention.

3 is a diagram illustrating an example of a discharge cell that is turned on among a plurality of discharge cells.

FIG. 4 is a diagram illustrating a driving waveform of the plasma display device according to the second exemplary embodiment of the present invention applied under the conditions of the discharge cell to be turned on as shown in FIG. 3.

5 is a diagram illustrating another example of a discharge cell that is turned on among a plurality of discharge cells.

FIG. 6 is a diagram illustrating a driving waveform of the plasma display device according to the second exemplary embodiment of the present invention applied under the condition of the discharge cell turned on as shown in FIG. 5.

FIG. 7 is a diagram illustrating a driving waveform of the plasma display device according to the third exemplary embodiment of the present invention, which is applied under the condition of a lit discharge cell as shown in FIG. 5.

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

Recently, flat panel displays such as liquid crystal displays (LCDs), field emission displays (FEDs), and plasma displays have been actively developed. Among these flat panel display devices, the plasma display device has advantages of higher luminance and luminous efficiency and a wider viewing angle than other flat panel display devices. Therefore, the plasma display panel is in the spotlight as a display device to replace a conventional cathode ray tube (CRT) in a large display device of 40 inches or more.

A plasma display device is a display device using a plasma display panel that displays characters or images by using plasma generated by gas discharge. The plasma display panel is composed of tens to millions or more pixels (discharge cells) depending on its size. .

The plasma display device is driven by dividing a frame into a plurality of subfields having respective luminance weights, and gray scales are displayed by a combination of weights of subfields in which a display operation occurs among the plurality of subfields. Each subfield includes an address period for selecting a light emitting cell and a cell not to emit light, and a sustain period for sustain discharge of a cell set to a light emitting cell state in the address period. In the address period, scan pulses are sequentially applied to the plurality of scan electrodes, and address pulses are applied to the address electrodes. At this time, in the discharge cells to which the scan pulse and the address pulse are simultaneously applied, the discharge cells to emit light are selected while the address discharge occurs. In such an address period, positive wall charges are formed in the scan electrodes by the address discharge, and negative wall charges are formed in the sustain electrodes and the address electrodes.

In the sustain period, the sustain discharge pulse is applied to the scan electrode and the sustain electrode in the opposite phase with the high level voltage (for example, the Vs voltage) and the low level voltage (for example, 0 V) alternately, so that the selected light emission discharges. The cells are sustained and discharged for a period corresponding to the weight of the subfield to display an image. In this sustain period, when the Vs voltage is applied to the scan electrode and the 0 V voltage is applied to the sustain electrode and the address electrode, the discharge between the scan electrode and the address electrode may occur before the discharge between the scan electrode and the sustain electrode. When discharge between the scan electrode and the address electrode occurs first in the sustain period, more positive wall charges are formed in the address electrode than in the sustain electrode. Then, when the 0V voltage is applied to the scan electrode and the Vs voltage is applied to the sustain electrode, the sustain discharge may not occur well between the scan electrode and the sustain electrode.

In the sustain period, when a large number of (+) wall charges are formed on the address electrode, there is a problem that the deterioration of the phosphor formed on the address electrode is intensified.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a method of driving the same, which stabilize a sustain discharge in a sustain period and prevent phosphor degradation.

As a means for achieving the above object, the method of the present invention comprises a plurality of scan electrodes and a plurality of address electrodes formed in a direction intersecting the plurality of scan electrodes, wherein the address period of the plasma display device is driven. Applying a first voltage to the N-th address electrode while scanning the first discharge cell when the first discharge cell, which is the latest scan among the discharge cells formed on the N-th address electrode, is turned on; And maintaining the first voltage at the N-th address electrode from the time when the first voltage is applied to the N-th address electrode until at least a part of the sustain period.

Further, according to another aspect of the present invention, the method of the present invention, when one or more second discharge cells adjacent to the first discharge cell of the discharge cells formed on the N-th address electrode is turned on in the address period, The first voltage is applied to the N-th address electrode while the second discharge cell and the first discharge cell are scanned, and from the time when the second discharge cell is scanned to the at least part of the sustain period, the N-th address Maintaining the first voltage on an electrode.

According to still another aspect of the present invention, there is provided a plasma display panel including a plurality of scan electrodes and a plurality of address electrodes formed in a direction crossing the plurality of scan electrodes, and a driving unit for driving the plasma display panel. The driving unit may include a first driving device configured to scan the first discharge cell when the first discharge cell, which is the latest scan among the discharge cells formed on the N-th address electrode, is turned on in the address period. The voltage is applied and the first voltage is maintained at the N-th address electrode from the time when the first voltage is applied to the N-th address electrode until at least a part of the sustain period.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

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.

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

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 A1 to Am extending in the column direction, and a plurality of sustain electrodes X1 to Xn and scan electrodes Y1 to Yn extending in pairs in the row direction. Include. The sustain electrodes X1 to Xn are formed corresponding to the scan electrodes Y1 to Yn, and generally have one end connected to each other in common. The plasma display panel 100 includes a substrate (not shown) on which the sustain electrodes X1 to Xn and the scan electrodes Y1 to Yn are arranged, and a substrate (not shown) on which the address electrodes A1 to Am are arranged. Is done. The two substrates are disposed to face the discharge spaces so that the scan electrodes Y1 to Yn and the address electrodes A1 to Am and the sustain electrodes X1 to Xn and the address electrodes A1 to Am are orthogonal to each other. At this time, the discharge space at the intersection of the address electrodes A1 to Am, the sustain electrodes X1 to Xn, and the scan electrodes Y1 to Yn forms a discharge cell. 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 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 composed of a reset period, an address period, and a sustain period.

The address driver 300 receives an address driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1 to Am.

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

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

2 and 7, a plasma display device according to an exemplary embodiment of the present invention applied to address electrodes A1 to Am, sustain electrodes X1 to Xn, and scan electrodes Y1 to Yn, and a driving thereof. The method will be described.

2 illustrates a driving waveform of the plasma display device according to the first embodiment of the present invention.

As shown in FIG. 2, in the rising period of the reset period, the voltage of the scan electrodes Y1 to Yn is maintained at Vs at the voltage Vs while the sustain electrodes X1 to Xn are held at the reference voltage (0 V in FIG. 2). Incrementally increases to voltage. In FIG. 2, the voltages of the scan electrodes Y1 to Yn increase as ramps. Then, while the voltages of the scan electrodes Y1 to Yn are increasing, they are weak between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn, and between the scan electrodes Y1 to Yn and the address electrodes A1 to Am. As one discharge (hereinafter referred to as "weak discharge") occurs, negative (-) wall charges are formed on the scan electrodes Y1 to Yn, and (+) to the sustain electrodes X1 to Xn and the address electrodes A1 to Am. Wall charges are formed.

In the falling period of the reset period, the voltage of the scan electrodes Y1 to Yn gradually decreases from the voltage Vs to the voltage Vnf while the sustain electrodes X1 to Xn are held at the Ve voltage. Then, while the voltages of the scan electrodes Y1 to Yn decrease, between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn, and between the scan electrodes Y1 to Yn and the address electrodes A1 to Am, As the discharge occurs, the negative wall charges formed on the scan electrodes Y1 to Yn and the positive wall charges formed on the sustain electrodes X1 to Xn and the address electrodes A1 to Am are erased. In general, the magnitude of the voltage (Vnf-Ve) is set near the discharge start voltage between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn. As a result, the wall voltage between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn becomes almost 0 V, whereby cells that do not generate an address discharge in the address period can be prevented from being erroneously discharged in the sustain period.

In order to select the discharge cells to be turned on in the address period, the scan pulses having the VscL voltage are sequentially applied to the plurality of scan electrodes while the voltages of the sustain electrodes X1 to Xn are maintained at the Ve voltage. At this time, an address pulse having a Va voltage is applied to an address electrode passing through a discharge cell to be selected from among discharge cells formed on the scan electrode to which the VscL voltage is applied. Then, an address discharge is generated between the address electrode to which the Va voltage is applied and the scan electrode to which the VscL voltage is applied, and the scan electrode to which the VscL voltage is applied, and the sustain electrode to which the Ve voltage is applied. Negative wall charges are formed on the electrodes and the sustain electrodes, respectively. The VscH voltage higher than the VscL voltage is applied to the scan electrode to which the VscL voltage is not applied, and the reference voltage is applied to the address electrode to which the Va voltage is not applied.

In order to perform this operation in the address period, the scan electrode driver 400 selects a scan electrode to which a scan pulse having a VscL voltage is applied among the scan electrodes Y1 to Yn. For example, in the single drive, the scan electrodes can be selected in the order arranged in the vertical direction. When one scan electrode is selected, the address electrode driver 300 selects a discharge cell to be turned on among discharge cells formed by the scan electrode. That is, the address electrode driver 300 selects a cell to which an address pulse having a Va voltage is applied among the address electrodes A1 to Am. Specifically, first, a scan pulse is applied to the scan electrodes of the first row (Y1 in FIG. 1) and an address pulse is applied to the address electrodes located in the cells to be turned on in the first row. Then, discharge occurs between the scan electrode (Y1 in FIG. 1) and the address electrode to which the address pulse is applied, so that a positive wall charge is applied to the scan electrode Y1, and a negative wall is applied to the address electrode and the sustain electrode. An electric charge is formed. As a result, the wall voltage Vwxy is formed between the scan electrode Y1 and the sustain electrode such that the potential of the scan electrode Y1 is higher than the potential of the scan electrode. Subsequently, when a scan pulse is applied to the scan electrode of the second row (Y2 in FIG. 1), an address pulse is applied to the address electrode located in the cell to be turned on in the second row. Then, address discharge occurs in the cell formed by the address electrode to which the address pulse is applied and the scan electrode Y2 in the second row, thereby forming wall charges in the cell. Similarly, the scan pulses are sequentially applied to the scan electrodes of the remaining rows, and the address pulses are applied to the address electrodes positioned in the cells to be turned on to form wall charges in the cells.

In the sustain period, the high level voltage (Vs voltage in FIG. 2) and the low level voltage (0V voltage in FIG. 2) are alternated between scan electrodes Y1 to Yn and sustain electrodes X1 to Xn in which wall charges are formed by the address discharge. The sustain discharge pulse is applied in the opposite phase to sustain discharge the cell set in the light emitting cell state in the address period. That is, 0 V is applied to the X electrode when the Vs voltage is applied to the scan electrode, and 0 V voltage is applied to the scan electrode when the Vs voltage is applied to the sustain electrode.

2, in the first embodiment of the present invention, the scan electrodes Y1 to Yn, the address electrodes A1 to Am, the sustain electrodes X1 to Xn, and the address electrodes A1 to Am during the sustain period. In order to reduce the voltage difference between them, the voltage Va1 is applied to the address electrode. In this case, a power supply for supplying the Va1 voltage using the Va voltage as the Va1 voltage may not be additionally used.

In this sustain period, when the Va voltage is applied to the address electrodes A1 to Am and the Vs voltage is alternately applied to the sustain electrodes X1 to Xn and the scan electrodes Y1 to Yn, the scan electrodes Y1 are caused by the address discharge. ˜Yn and the address electrodes A1 to Am and the voltage difference Vs-Va between the sustain electrodes X1 to Xn and the address electrodes A1 to Am decrease to decrease the scan electrodes Y1 to Yn and the sustain electrode X1. The sustain discharge between ˜Xn) is made stable.

3 illustrates an example of a discharge cell that is turned on among a plurality of discharge cells, and FIG. 4 is a driving waveform of the plasma display device according to the second embodiment of the present invention applied under the conditions of the discharge cell that is turned on as shown in FIG. 3. It is a diagram showing. In FIG. 3, the discharge cells that are turned on among the plurality of discharge cells are indicated by ellipses.

Scan pulses are sequentially applied to the scan electrodes in the address period, and according to the embodiment of the present invention, the scan pulses are sequentially applied from the Y1 electrode to the Yn electrode. The order of applying the scan pulse can be variously controlled by the user setting the scan electrode driver 400 arbitrarily. Therefore, the present invention is not limited to the case where the scan pulse is applied from the Y1 electrode to the Yn electrode.

As shown in FIG. 3, only the discharge cells 10 and 11 of the discharge cells formed in the first address electrode A1 are turned on, so that only when the scan pulse is applied to the Y1 electrode and the Y3 electrode as shown in FIG. 4, the first address electrode is turned on. A voltage of Va, which is an address voltage, is applied to (A1). As in the first embodiment, Va voltage is maintained at the first address electrode A1 in the sustain period.

Next, as shown in FIG. 3, only the discharge cells 12, 13, and 14 of the discharge cells formed in the second address electrode A2 are turned on, and thus, as shown in FIG. The Va voltage is applied to the second address electrode A1 only when it is applied. At this time, in order to reduce the number of switching of the switch for applying the voltage to the address electrode, when the scan pulse is applied to the last scan electrode (Yn), Va voltage is applied until the sustain period after applying the Va voltage to the second address electrode (A2). Keep it.

Meanwhile, as shown in FIG. 3, only the discharge cells 15 of the discharge cells formed on the m−1th address electrode Am−1 are turned on, so that only when a scan pulse is applied to the Yn electrode as shown in FIG. A Va voltage is applied to the electrode Am-1. At this time, when the scan pulse is applied to the last scan electrode Yn like the second address electrode A2, the Va voltage is applied to the address electrode Am-1 and the Va voltage is maintained until the sustain period.

As shown in FIG. 3, when no discharge cells are turned on among the discharge cells formed in the m-th address electrode Am, Va voltage is applied to and maintained at the address electrode Am in the sustain period as shown in FIG. 4.

FIG. 5 illustrates another example of a discharge cell that is turned on among a plurality of discharge cells, and FIG. 6 illustrates a driving of the plasma display device according to the second embodiment of the present invention applied under conditions of the discharge cell that is turned on as shown in FIG. 5. The figure which shows a waveform.

As shown in FIG. 5, only the discharge cells 21 and 22 of the discharge cells formed in the first address electrode A1 are turned on. Therefore, as shown in FIG. 6, the first address electrode only when a scan pulse is applied to the Y1 electrode and the Yn electrode. The voltage Va is applied to (A1). At this time, in order to reduce the number of switching, when a scan pulse is applied to the last scan electrode Yn as in the second electrode A2 shown in FIG. 4, the Va voltage is applied to the first address electrode A1 and then the sustain voltage is maintained. Keep it.

As shown in FIG. 5, only the discharge cells 23, 24, and 25 of the discharge cells formed on the second address electrode A2 are turned on, so that scanning pulses are applied to the Y1 electrode, the Yn-1 electrode, and the Yn electrode as shown in FIG. 6. The Va voltage is applied to the address electrode A2 only when it is applied. At this time, the Yn electrode and the Yn-1 electrode are electrodes adjacent to each other in time to which the scan pulse is applied, and the discharge cell 25 formed on the Yn electrode and the discharge cell 24 formed on the Yn-1 electrode are turned on. Therefore, in order to reduce the number of switching, when the scan pulse is applied to the Yn electrode and the Yn-1 electrode, the Va voltage is maintained at the second address electrode A2 from the time when the scan pulse is applied to the Yn-1 electrode to the sustain period.

As shown in FIG. 5, only the discharge cells 26, 27, 28, and 29 of the discharge cells formed on the m−1 th address electrode Am−1 are turned on, so that the Y1 electrode and the Yn-2 electrode as shown in FIG. 6. The Va voltage is applied to the address electrode Am-1 only when the scan pulse is applied to the Yn-1 electrode and the Yn electrode. At this time, the Yn electrode and the Yn-1 electrode are electrodes adjacent to each other in time to which a scan pulse is applied, and the Yn-1 electrode and Yn-2 electrode are also electrodes adjacent to each other. The discharge cells 29, 28, and 27 formed on the Yn-1 electrode and the Yn-2 electrode including the Yn electrode are turned on. Therefore, in order to reduce the number of switching, when the scan pulse is applied to the Yn-2 electrode, the Yn-1 electrode, and the Yn electrode, the Am-1st address electrode (from the time point at which the scan pulse is applied to the Yn-2 electrode to the sustain period) Maintain Va voltage at Am-1).

As shown in FIG. 5, when none of the discharge cells that are turned on among the discharge cells formed in the m-th address electrode Am is applied, Va voltage is applied to and maintained at the address electrode Am in the sustain period as shown in FIG. 6.

4 and 6 illustrate that the Va voltage is applied to the address electrodes A1 to Am during the entire sustain period, but the Va voltage is applied to the address electrodes A1 to Am during the initial partial period of the sustain period. Reference voltages (0 V voltages in FIGS. 4 and 6) may be applied in the sustain period except for the following.

That is, when sustain discharge occurs between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn in the initial partial period of the sustain period, Va voltage is applied to the address electrodes A1 to Am. At this time, the voltage difference Vs-Va between the scan electrodes Y1 to Yn and the address electrodes A1 to Am and the sustain electrodes X1 to Xn and the address electrodes A1 to Am decreases, thereby reducing the scan electrodes Y1 to Yn. And sustain discharge between the sustain electrodes X1 to Xn is stable. As a result, a smaller amount of positive wall charges are formed in the address electrodes A1 to Am than before the Va voltage is applied, and the reference voltages are applied to the address electrodes A1 to Am in a period other than the initial partial period of the sustain period. Even when applied, no discharge is generated between the scan electrodes Y1 to Yn, the address electrodes A1 to Am, and the sustain electrodes X1 to Xn, and the address electrodes A1 to Am. Therefore, even if the Va voltage is applied to the address electrodes A1 to Am only in the sustain period initial period, the same effect as applying the Va voltage in the entire sustain period can be obtained.

In addition, since the address electrodes A1 to Am to which the Va voltage is applied in the sustain period are formed with less positive wall charges than the address electrodes A1 to Am to which the Va voltage is not applied, phosphor degradation can be prevented. have.

FIG. 7 is a diagram illustrating a driving waveform of the plasma display device according to the third exemplary embodiment of the present invention, which is applied under the condition of a lit discharge cell as shown in FIG. 5. The driving waveform of the plasma display device according to the third embodiment of the present invention shown in FIG. 7 is the same as that of the second embodiment except for floating the address electrodes A1 to Am in the sustain period.

As shown in FIG. 5, only the discharge cells 21 and 22 of the discharge cells formed in the first address electrode A1 are turned on, so that only when a scan pulse is applied to the Y1 electrode and the Yn electrode in the address period as shown in FIG. 7. The Va voltage is applied to the first address electrode A1. At this time, in order to reduce the number of switching, when the scan pulse is applied to the scan electrode Yn in the address period, the Va voltage applied to the first address electrode A1 is maintained before the sustain period, and the first address electrode A1 in the sustain period. Plot

As shown in FIG. 5, only the discharge cells 23, 24, and 25 of the discharge cells formed on the second address electrode A2 are turned on, and thus, the Y1 electrode, Yn-1 electrode, and Yn electrode in the address period as shown in FIG. 7. The Va voltage is applied to the address electrode A2 only when the scan pulse is applied. At this time, in order to reduce the number of switching, Va voltage is applied to the second address electrode A2 from the time when the scan pulse is applied to the Yn-1 electrode in the address period and before the sustain period, and the second address electrode A2 is floated in the sustain period. do.

As shown in FIG. 5, only the discharge cells 26, 27, 28, and 29 of the discharge cells formed on the m−1 th address electrode Am−1 are turned on, so as shown in FIG. 7, the Y1 electrode and the Yn-2 electrode. The Va voltage is applied to the address electrode Am-1 only when the scan pulse is applied to the Yn-1 electrode and the Yn electrode. At this time, in order to reduce the number of switching, Va voltage is applied to the m-1 th address electrode Am-1 from the time when the scan pulse is applied to the Yn-2 electrode in the address period and before the sustain period, and m-1 in the sustain period. The first address electrode Am-1 is floated.

As shown in FIG. 5, when no discharge cells are turned on among the discharge cells formed in the m-th address electrode Am, the address electrode Am is floated in the sustain period as shown in FIG. 7.

In the case where the address electrodes A1 to Am are floated in the sustain period, the address electrodes A1 to Am change in accordance with the voltage Vs applied to the scan electrodes Y1 to Yn or the sustain electrodes X1 to Xn. As a result, the voltage difference Vs-Va between the scan electrodes Y1 to Yn and the address electrodes A1 to Am and the sustain electrodes X1 to Xn and the address electrodes A1 to Am decreases, and the scan electrodes Y1 to Yn decrease. The sustain discharge between Yn) and sustain electrodes X1 to Xn is stable. In addition, since at least a part of the sustain period, the address electrodes A1 to Am to which the Va voltage is applied have less positive wall charges than the address electrodes A1 to Am to which the Va voltage is not applied. The third embodiment may have the same effect as the second embodiment.

In the embodiment of the present invention, the case where the sustain discharge pulse having the Vs voltage and the 0 V voltage are alternately applied to the Y electrode and the X electrode has been described. However, another type of sustain discharge pulse may be used. For example, while the X electrode is applied with a reference voltage (for example, 0 V voltage), a sustain discharge pulse may be applied to the Y electrode alternately having a Vs voltage and a -Vs voltage. Even in this manner, the voltage difference between the X electrode and the Y electrode is the same as in the case of the sustain discharge pulse having the Vs voltage and the 0V voltage alternately.

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 present invention, the voltage difference between the address electrode and the scan electrode, and the address electrode and the sustain electrode decreases, so that sustain discharge occurs stably, and the switching frequency of applying the voltage to the address electrode decreases, thereby reducing the EMI (Electro Magnetic Interference). ) Can be reduced.

Claims (13)

A method of driving a plasma display device comprising a plurality of scan electrodes and a plurality of address electrodes formed in a direction crossing the plurality of scan electrodes. Applying a first voltage to the N-th address electrode while the first discharge cell is turned on when the first discharge cell that is the latest scan among the discharge cells formed on the N-th address electrode is turned on in the address period; And And maintaining the first voltage at the N-th address electrode from the time when the first voltage is applied to the N-th address electrode until at least a part of the sustain period. The method of claim 1, In the address period, when one or more second discharge cells adjacent to the first discharge cell among the discharge cells formed on the Nth address electrode are turned on, the Nth address electrode is connected to the Nth address electrode while the second discharge cell is being scanned. Applying a first voltage; And And maintaining the first voltage at the N-th address electrode from the time when the second discharge cell is scanned to at least part of a sustain period. The method of claim 1, In the address period, when the first discharge cell is not turned on among the discharge cells formed on the Nth address electrode, the first voltage is equal to the first voltage to the Nth address electrode from the sustain period to at least a part of the sustain period. And maintaining a second voltage having a polarity. The method of claim 3, And the second voltage is the same voltage as the first voltage. The method of claim 1, The plasma display device further includes a plurality of sustain electrodes. Applying a sustain discharge pulse having a high level voltage and a low level voltage alternately in the sustain period to the plurality of scan electrodes and the plurality of sustain electrodes in opposite phases, and And applying a third voltage having the same polarity as the first voltage to the plurality of address electrodes in at least a portion of the sustain period. The method of claim 5, And the third voltage is the same voltage as the first voltage. A method of driving a plasma display device comprising a plurality of scan electrodes and a plurality of address electrodes formed in a direction crossing the plurality of scan electrodes. Applying a fourth voltage to the N-th address electrode while the third discharge cell is turned on when the third discharge cell which is the latest scan among the discharge cells formed on the N-th address electrode is turned on in the address period; And Maintaining the fourth voltage at the N-th address electrode from the time when the fourth voltage is applied to the N-th address electrode until the sustain period, and floating the N-th address electrode from the sustain period to at least a part of the sustain period. Method of driving a plasma display device comprising a. The method of claim 7, wherein In the address period, when one or more fourth discharge cells adjacent to the third discharge cell among the discharge cells formed on the Nth address electrode are turned on, the Nth address electrode is connected to the Nth address electrode while the fourth discharge cell is scanned. Applying a fourth voltage; And Maintaining the fourth voltage on the N-th address electrode from the time when the fourth discharge cell is scanned to the sustain period, and floating the N-th address electrode from the sustain period to at least a part of the sustain period. A method of driving a plasma display device. The method of claim 7, wherein In the address period, when the third discharge cell is not turned on among the discharge cells formed in the Nth address electrode, floating the Nth address electrode from a sustain period to at least a part of the sustain period. A method of driving a plasma display device. A plasma display panel including a plurality of scan electrodes and a plurality of address electrodes formed in a direction crossing the plurality of scan electrodes; And A driving unit driving the plasma display panel; The driving unit, In the address period, when the first discharge cell which is the latest scan among the discharge cells formed on the predetermined address electrode is turned on, a first voltage is applied to the predetermined address electrode while the first discharge cell is scanned, And the first voltage is held at the predetermined address electrode from the time when the first voltage is applied to the predetermined address electrode until at least a part of the sustain period. The method of claim 10 The driving unit, In the address period, when the second discharge cell adjacent to the first discharge cell of the discharge cells formed on the predetermined address electrode is turned on, the predetermined address while the second discharge cell and the first discharge cell are scanned. Applying the first voltage to an electrode, And the first voltage is maintained at the predetermined address electrode from the time when the second discharge cell is scanned to at least a part of a sustain period. The method of claim 10, The driving unit, In the address period, when the first discharge cell is not turned on among the discharge cells formed on the predetermined address electrode, the plasma maintains the second voltage on the predetermined address electrode from the sustain period to at least a part of the sustain period. Display device. The method of claim 10, And the second voltage is the same voltage as the first voltage.

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