KR100649193B1 - Plasma display device and driving method thereof - Google Patents

Abstract

In the method of driving a plasma display device according to the present invention, a second voltage higher than the first voltage and the second voltage higher than the first voltage are applied to the second electrode while the voltage of the first electrode is maintained at the first voltage. The voltage of the positive electrode of the capacitor charged with the fourth voltage corresponding to the difference between the second voltage and the first voltage in the sustain period of alternately applying a third voltage which is as low as the difference between the first voltage and the first voltage. Change to one voltage and apply the third voltage to the second electrode through the cathode of the capacitor. In this way, it is not necessary to use a separate power supply for applying the third voltage.

Description

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

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

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

3 is a diagram illustrating a sustain discharge driving circuit of a scan electrode driver according to a first exemplary embodiment of the present invention.

4 is a diagram illustrating a driving timing of the driving circuit illustrated in FIG. 3.

5A and 5B are diagrams showing current paths in respective modes of the driving circuit shown in FIG.

6 is a diagram illustrating a sustain discharge driving circuit of a scan electrode driver according to a second exemplary embodiment of the present invention.

FIG. 7 is a diagram illustrating a driving timing of the driving circuit illustrated in FIG. 6.

8A to 8C are diagrams showing current paths in respective modes of the driving circuit shown in FIG.

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, dozens to millions or more pixels (discharge cells) are arranged in a matrix form according to their size.

The display panel of the plasma display device is driven by dividing one frame into a plurality of subfields having respective weights. Each subfield includes a reset period, an address period, and a sustain period. The reset period is a period of initializing discharge cells in order to stably perform the next address discharge. The address period is a period for selecting cells that are turned on and cells that are not turned on in the display panel. The sustain period is a period in which sustain discharge for actually displaying an image is performed for the cells to be turned on.

To perform this operation, sustain discharge pulses are applied to the scan electrodes and sustain electrodes alternately in the sustain period, and the reset waveform and the scan waveform are applied to the scan electrodes in the reset period and the address period. Therefore, the scan driving board for driving the scan electrodes and the sustain driving board for driving the sustain electrodes must be separately. As such, when the driving board is separately present, there is a problem in that the driving board is mounted on the chassis base, and the unit cost increases due to the two driving boards.

Therefore, a method of integrating two driving boards into one to form one end of the scan electrode and extending one end of the sustaining electrode to connect to the integrated board has been proposed. However, when the two driving boards are integrated in this manner, there is a problem in that an impedance component formed from a long extended sustain electrode becomes large.

In order to solve this problem, Korean Patent Laid-Open Publication No. 2003-90370 discloses a technique of applying a sustain discharge pulse having alternating Vs voltages and -Vs voltages to only the scan electrodes in the sustain period and biasing the sustain electrodes to the ground voltage. It is. The sustain discharge drive circuit for applying such sustain discharge pulses uses a power recovery circuit that recovers and reuses reactive power.

That is, the sustain discharge driving circuit alternately applies the Vs voltage and the -Vs voltage to the scan electrode by using the resonance of the inductor L and the panel capacitor Cp through the on / off operation of the switch in the power recovery circuit.

However, in the case where the Vs voltage and the -Vs voltage are alternately applied to the scan electrode in the sustain period as described above, the difference between the maximum voltage Vs and the minimum voltage (-Vs) applied to the scan electrode becomes 2Vs, and the power at this time is The loss is 1/2 Cp ( ² Vs) ² . On the other hand, the power loss in the case of applying the Vs voltage to the sustain electrode and the scan electrode alternately is 1 / 2Cp (Vs) ² + 1 / 2Cp (Vs) ² . Therefore, when the Vs voltage and the -Vs voltage are alternately applied to the scan electrodes in the sustain period, the power loss increases twice as compared with the case where the Vs voltage is alternately applied to the sustain electrodes and the scan electrodes.

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 can reduce power loss in a sustain period and simplify the configuration of a power supply circuit.

According to an aspect of the present invention, a plasma display panel including a plurality of first electrodes and a plurality of second electrodes, and the plurality of second electrodes in a state in which voltages of the plurality of first electrodes are maintained at a first voltage A plasma display device including a driving circuit configured to alternately apply a second voltage higher than the first voltage and a third voltage lower than the first voltage by the difference between the first voltage and the first voltage to the electrode. In this case, the driving circuit may include a first switch having a first end connected to the plurality of second electrodes, a first end connected to a first power supply for supplying the second voltage, and the plurality of second electrodes. A second switch having a second end connected to the second switch, and a voltage of a positive electrode of a capacitor charged with a second voltage corresponding to a difference between the second voltage and the first voltage to the first voltage; And a switching unit connecting the voltage of the cathode of the first switch to the third switch to apply the third voltage to the plurality of second electrodes through the cathode of the capacitor.

According to another feature of the present invention, the second electrode of the plasma display panel including a plurality of first electrodes and a plurality of second electrodes is maintained at a first voltage than the first voltage at the second electrode. A driving method of a plasma display device is provided by alternately applying a high second voltage and a third voltage lower than the first voltage by a difference between the second voltage and the first voltage. The driving method may include applying the second voltage to the second electrode, decreasing the voltage of the second electrode from the second voltage, and applying a second voltage corresponding to a difference between the second voltage and the first voltage. Electrically connecting a positive electrode of a capacitor charged with a voltage to a first power supply for supplying the first voltage, and applying the third voltage to the second electrode through a negative electrode of the capacitor, and the second electrode Increasing the voltage at the third voltage.

According to another feature of the present invention, a method of driving a plasma display device in which a panel capacitor is formed by a first electrode and a second electrode is provided. The driving method alternately applies a second voltage higher than the first voltage and a third voltage lower than the first voltage to the second electrode while maintaining the voltage of the first electrode at the first voltage. In the sustain period, applying the third voltage to the second electrode may include changing a voltage of the second electrode through resonance of the panel capacitor and an inductor electrically connected to the second electrode, and And applying the third voltage to the second electrode using a capacitor electrically connected to a first power supply for supplying a second voltage to charge the second voltage.

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. When a part is connected to another part, this includes not only a directly connected part but also an electrically connected part with another element in between.

In the present invention, the wall charge refers to a charge formed close to each electrode on the cell wall (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.

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 and scan electrodes X1 to Xn and Y1 to Yn are arranged, and a substrate (not shown) on which the address electrodes A1 to Am are arranged. The two substrates are disposed to face each other 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 and the sustain and scan electrodes X1 to Xn and 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 electrode driving control signal, a sustain electrode driving control signal, and a scan electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields, and each subfield is composed of a reset period, an address period, and a sustain period.

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

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

Next, a driving waveform of the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2. For convenience of description, the scan electrode (hereinafter referred to as “Y electrode”), the sustain electrode (hereinafter referred to as “X electrode”), and the address electrode (hereinafter referred to as “A electrode”) forming one cell will be described below. Only the driving waveform to be applied will be described.

2 illustrates a driving waveform of a plasma display device according to an exemplary embodiment of the present invention. 2 shows only drive waveforms in the sustain period.

As shown in Fig. 2, in the sustain period, a sustain discharge pulse having a Vs voltage and a -Vs voltage is applied to the Y electrode while the A electrode and the X electrode are biased with the ground voltage. In this case, since the sustain discharge pulse is supplied only from the scan electrode driver 400, the impedance in the path to which the sustain discharge pulse is applied may be constant.

In general, the wall voltage Vwxy is formed so that the potential of the Y electrode is higher than that of the X electrode in the cell selected as the cell turned on in the address period (not shown). Therefore, in the sustain period, a sustain discharge pulse having a voltage of Vs is first applied to the Y electrode while a 0 V voltage is applied to the A electrode and the X electrode to generate a sustain discharge between the Y electrode and the X electrode. At this time, the voltage Vs is set to be lower than the discharge start voltage between the Y electrode and the X electrode, and the voltage (Vs + Vwxy) is higher than the discharge start voltage. As a result of the sustain discharge, negative wall charges are formed on the Y electrode and positive wall charges are formed on the X electrode and the A electrode, so that the wall voltage Vwyx is formed so that the potential of the X electrode is high with respect to the potential of the Y electrode. do.

Subsequently, a sustain discharge pulse having a voltage of -Vs is applied to the Y electrode to generate a sustain discharge between the Y electrode and the X electrode. As a result, positive wall charges are formed on the Y electrode, negative wall charges are formed on the X electrode and the A electrode, and a sustain discharge can be generated when the Vs voltage is applied to the Y electrode. Thereafter, the process of alternately applying the sustain discharge pulses of the Vs voltage and the -Vs voltage to the Y electrode is repeated the number of times corresponding to the weight indicated by the corresponding subfield.

Next, the driving circuit for applying the sustain discharge pulse in the sustain period will be described in detail with reference to FIGS. 3 to 5B. The switch used below may be composed of an n-channel field effect switch (FET) having a body diode, and may be composed of other switches having the same or similar functions. The capacitive component formed by the X electrode and the Y electrode is illustrated as a panel capacitor Cp and a ground voltage is applied to the sustain electrode X of the panel capacitor Cp.

3 is a diagram illustrating a sustain discharge driving circuit of a scan electrode driver according to a first exemplary embodiment of the present invention.

As shown in FIG. 3, the sustain discharge driving circuit of the scan electrode driver 400 according to the first embodiment of the present invention includes a power recovery circuit 410 and a sustain pulse generator 420.

The power recovery circuit 410 includes switches Yr1, Yr2, Yf1, Yf2, inductors L1, L2, diodes Dr1, Dr2, Df1, Df2, and capacitors Ce1, Cer2.

The power recovery capacitors Cer1 and Cer2 are connected to the drain of the switch Yr1, the source of the switch Yf1, the drain of the switch Yr2, and the source of the switch Yf2. The second ends of the inductors L1 and L2 having the first ends connected to the Y electrodes of the panel capacitor Cp are connected to the sources of the switches Yr1 and Yr2 and the drains of the switches Yf1 and Yf2. Diodes Dr1, Dr2, Df1, and Df2 are connected in series to the switches Yr1, Yr2, Yf1, and Yf2, respectively.

A diode Dr1 is connected between the source of the switch Yr1 and the inductor L1, and a diode Df1 is connected between the drain of the transistor Yf1 and the inductor L1. In addition, the diode Dr2 is connected between the source of the transistor Yr2 and the inductor L2, and the diode Df2 is connected between the drain of the transistor Yf2 and the inductor L2. At this time, the capacitor Ce1 is charged with the voltage Vs / 2 and the capacitor Ce2 is charged with the voltage -Vs / 2.

The diodes Dr1 and Dr2 are for setting up the rising path for increasing the voltage of the panel capacitor Cp when the switches Yr1 and Yr2 have a body diode, and the diodes Df1 and Df2 are the switches Yf1 and Yf2. Has a body diode to set the falling path for lowering the voltage of the Y electrode. In this case, if the switches Yr1, Yr2, Yf1, and Yf2 do not have a body diode, the diodes Dr1, Df1, Dr2, and Df2 may be removed. The connected power recovery circuit 410 increases or decreases the voltage of the Y electrode by using resonance of the inductors L1 and L2 and the panel capacitor Cp.

In the power recovery unit 410, the connection order between the inductor L1, the diode Df1, and the switch Yf1 may be changed, and the connection order between the inductor L1, the diode Dr1, and the switch Yr1 may also be changed. Can be. For example, the inductor L1 may be connected between the contacts of the switches Yr1 and Yf1 and the power recovery capacitor Ce1. Similarly, the order of connection between the inductor L2, the diode Df2 and the switch Yf2 in the power recovery unit 410 may be changed, and the connection order between the inductor L2, the diode Dr2 and the switch Yr2 may be changed. Can be changed.

In addition, although the inductor L1 is connected to the contacts of the switches Yr1 and Yf1 in FIG. 3, the inductor may be connected to each of the rising path formed by the switch Yr1 and the falling path formed by the switch Yf1. .

The sustain pulse generator 420 includes two switches Ys1 and Yg1. The switch Ys1 is connected between the power supply Vs supplying the Vs voltage and the Y electrode of the panel capacitor Cp, and the switch Yg1 is the power supply supplying the voltage -Vs (-Vs) and the panel capacitor Cp. Is connected between the Y electrodes. These switches (Ys1, Yg1) are connected to the Y electrode with Vs Supply voltage and -Vs voltage respectively.

Next, the time-series operation change in the sustain period of the sustain discharge driving circuit according to the embodiment of the present invention will be described in detail with reference to FIGS. 4 to 5B. Herein, the operation change is performed in six modes M1 to M6, and the mode change is caused by the operation of the switch. The phenomenon referred to as LC resonance below is not a continuous oscillation, but a change in voltage and current due to the combination of the inductors L1 and L2 and the panel capacitor Cp generated when the switches Yr1, Yr2, Yf1, and Yf2 are turned on. It is a phenomenon.

4 is a diagram illustrating a driving timing of the driving circuit illustrated in FIG. 3, and FIGS. 5A and 5B are diagrams illustrating current paths in respective modes of the driving circuit illustrated in FIG. 3.

It is assumed that the voltage of the Y electrode of the panel capacitor Cp is maintained at the ground voltage (0V) before the mode 1 (M1) starts.

In mode 1 M1, the switch Yr1 is turned on. Then, as illustrated in FIG. 5A, a current path is formed by the Y electrodes of the capacitor Ce1, the switch Yr1, the diode Dr1, the inductor L1, and the panel capacitor Cp (①). This path 1 causes LC resonance between the inductor L1 and the panel capacitor Cp. At this time, since the voltage Vs / 2 is charged to the capacitor Ce1, the voltage of the Y electrode of the panel capacitor Cp is Vs due to LC resonance. Increases to near voltage.

In mode 2 M2, the switch Ys1 is turned on and the switch Yr1 is turned off. Then, as shown in Fig. 5A, a current path is formed by the Y electrodes of the power supply Vs, the switch Ys1, and the panel capacitor Cp (2). At this time, the voltage Vs is applied to the Y electrode by the path ②.

In mode 3 M3, the switch Ys1 is turned off and the switch Yf1 is turned on. Then, as illustrated in FIG. 5A, a current path is formed to the Y electrode, the inductor L1, the diode Df1, the switch Yf1, and the capacitor Ce1 of the panel capacitor Cp (③). This path ③ causes LC resonance between the inductor L1 and the panel capacitor Cp. Due to this LC resonance, the voltage charged in the panel capacitor Cp is discharged, and the voltage of the Y electrode of the panel capacitor Cp decreases to near 0V voltage.

In mode 4 M4, the switch Yf1 is turned off and the switch Yf2 is turned on. Then, as shown in FIG. 5B, a current path is formed to the Y electrode, the inductor L2, the diode Df2, the switch Yf1, and the capacitor Ce2 of the panel capacitor Cp (4). This path ④ produces an LC resonance between the inductor L1 and the panel capacitor Cp. The LC resonant causes the voltage charged in the panel capacitor Cp to be discharged so that the voltage at the Y electrode of the panel capacitor Cp is reduced to near the -Vs voltage.

In mode 5 M5, the switch Yg1 is turned on and the switch Yf2 is turned off. Then, as shown in Fig. 5B, a current path is formed to the Y electrode, the switch Yg1, and the power source -Vs of the panel capacitor Cp (5). This path applies a -Vs voltage to the Y electrode.

In mode 6 M6, the switch Yg1 is turned off and the switch Yr2 is turned on. Then, as shown in FIG. 5B, a current path is formed to the Y electrode of the capacitor Ce2, the switch Yr2, the diode Dr2, the inductor L2, and the panel capacitor Cp (6). This path 6 generates LC resonance between the inductor L2 and the panel capacitor Cp. At this time, since the capacitor Ce1 is charged with the voltage -Vs / 2, the voltage of the Y electrode of the panel capacitor Cp is 0V due to LC resonance. Increases to near voltage.

The repetition of the modes M1 to M6 allows the voltage of the Y electrode to swing between the voltage Vs and the voltage -Vs.

Thus, according to the driving circuit according to the first embodiment of the present invention, by separating the power recovery circuit into two, the power loss at this time is 1 / 2Cp (Vs) ² + 1 / 2Cp (Vs) ² . Therefore, the power loss can be reduced compared to the power loss (1/2 Cp (2Vs) ² ) when the Vs voltage and the -Vs voltage are alternately applied to the conventional scan electrode.

On the other hand, the sustain discharge driving circuit according to the first embodiment of the present invention supplies the power supply (Vs) and -Vs voltage for supplying the Vs voltage to alternately apply the Vs voltage and -Vs voltage to the scan electrode in the sustain period. Power supply (-Vs). As described above, when power sources having different polarities are used, the configuration of the power supply circuit is complicated. Hereinafter, an embodiment for simplifying the configuration of the power supply circuit will be described in detail with reference to FIGS. 6 to 8C.

6 is a diagram illustrating a sustain discharge driving circuit of a scan electrode driver according to a second exemplary embodiment of the present invention.

As shown in FIG. 6, the sustain discharge driving circuit of the scan electrode driver 400 according to the second exemplary embodiment of the present invention is different from the first embodiment except that the switching unit 430 and the capacitor C1 are added. Have the same structure. Specifically, the switching unit 430 includes switches Y, Y2, and Y3, and switches Y1 and Y2 are connected in series between the power supply Vs and the ground voltage, and the contacts of the switches Y1 and Y2 are provided. The positive pole of the capacitor C1 is connected to the switch, the switch Y3 is connected to the negative pole of the capacitor C2, and the drain of the switch Y3 is connected to the ground voltage. Unlike FIG. 3, the source of the switch Yg1 is connected to the ground voltage. At this time, the switches (Y1, Y2, Y3) and the capacitor (C1) serves as a power supply (-Vs) for supplying the voltage -Vs.

Next, a change in time series operation of the sustain discharge driving circuit in the sustain period according to the embodiment of the present invention will be described in detail with reference to FIGS. 7 to 8C.

FIG. 7 is a diagram illustrating a driving timing of the driving circuit illustrated in FIG. 6, and FIGS. 8A to 8C are diagrams illustrating current paths in respective modes of the driving circuit illustrated in FIG. 6.

It is assumed that the voltage of the Y electrode of the panel capacitor Cp is maintained at the ground voltage (0V) before the mode M1 starts. It is assumed that capacitors Cer1 and Cer2 are charged with voltages of Vs / 2 and -Vs / 2, respectively.

In mode 1 M1, the switches Yg1 and Y3 are turned off and the switch Yr1 is turned on. Then, as illustrated in FIG. 8A, a current path is formed by the Y electrodes of the capacitor Ce1, the switch Yr1, the diode Dr1, the inductor L1, and the panel capacitor Cp (①). This path ① causes LC resonance between the inductor L1 and the panel capacitor Cp so that the voltage at the Y electrode of the panel capacitor Cp is Vs. Increases to near voltage.

In mode 2 M2, the switches Ys1, Y1, Y3 are turned on and the switch Yr1 is turned off. Then, as shown in FIG. 8A, the current path and the power supply Vs, the switch Y1, the capacitor C1, the switch Y3, and the ground are connected to the Y electrodes of the power supply Vs, the switch Ys1, and the panel capacitor Cp. Current paths to stage (0) are simultaneously formed (2, 2). At this time, the voltage Vs is applied to the Y electrode by the path ②, and the voltage Vs is charged to the capacitor C1 by the path ② '.

In mode 3 M3, the switch Yf1 is turned on and the switches Ys1, Y1, Y3 are turned off. Then, as shown in FIG. 8B, a current path is formed from the panel capacitor Cp to the Y electrode, the inductor L1, the diode Df1, the switch Yf1, and the capacitor Ce1 (3). This path ③ causes LC resonance between the inductor L1 and the panel capacitor Cp so that the voltage at the Y electrode of the panel capacitor Cp decreases to near 0V.

In mode 4 M4, the switches Yf2 and Y2 are turned on and the switch Yf1 is turned off. Then, as shown in FIG. 8B, a current path is formed to the Y electrode, the inductor L2, the diode Df2, the switch Yf1, and the capacitor Ce2 of the panel capacitor Cp (4). This path ④ causes LC resonance between the inductor L1 and the panel capacitor Cp so that the voltage at the Y electrode of the panel capacitor Cp decreases to near the -Vs voltage.

Since the switch Y2 is turned on, a voltage of 0 V is applied to one end of the capacitor C1, that is, the anode of the capacitor C1, so that the voltage of the other end of the capacitor C2, that is, the cathode of the capacitor C1, becomes a -Vs voltage. .

In mode 5 M5, the switch Yg1 is turned on and the switch Yf2 is turned off. Then, as shown in Fig. 8C, a current path to the Y electrode, the switch Yg1, the capacitor C1, and the switch Y2 of the panel capacitor Cp is formed (5). By this path (5), the voltage -Vs is applied to the Y electrode through the cathode of the capacitor C1.

In mode 6 M6, switch Yr2 is turned on and switches Yg1, Y2 are turned off. Then, as shown in FIG. 8C, a current path is formed to the Y electrode of the capacitor Ce2, the switch Yr2, the diode Dr2, the inductor L2, and the panel capacitor Cp (6). This path (6) causes LC resonance between the inductor L2 and the panel capacitor Cp so that the voltage at the Y electrode of the panel capacitor Cp is 0V. Increases to near voltage.

The repetition of the modes M1 to M6 allows the voltage of the Y electrode to swing between the voltage Vs and the voltage -Vs.

On the other hand, the drive timing of the switches Y1, Y2, Y3 may be different from the drive timing shown in FIG. The switches Y1 and Y3 may be turned on until the third voltage is applied to the Y electrode, that is, until the switch Yg1 is turned on, and the switch Y2 continues after the voltage is charged in the capacitor C1. It may be turned on.

In addition, instead of the switch Y3, the switching unit 430 may use a diode in which an anode is connected to the capacitor C1 and a cathode is connected to the ground voltage. In this manner, even when the diode is used, when the switch Y1 is turned on, the voltage Vs can be charged to the capacitor C1 through the path of the switch Y1, the capacitor C1, and the diode.

In addition, the switch Y1 may be used instead of the switch Y1 as the switch Ys1. That is, the switch Y1 disappears and the contact point of the switch Y2 and the capacitor C1 may be connected to the contact point of the switch Ys1 and the inductor L1. Even in this case, the voltage Vs can be charged to the capacitor C1 through the path of the switch Ys1, the capacitor C1, and the switch Y3.

According to the embodiment of the present invention described above, after the Vs voltage is charged in the capacitor C1, the −Vs voltage may be applied to the Y electrode by using the voltage charged in the capacitor C1. In this way, since the power supply (-Vs) for applying the -Vs voltage to the Y electrode is not required, the configuration of the power supply circuit is simplified.

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 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, in applying the Vs voltage and the -Vs voltage to only one of the scan electrode and the sustain electrode in the sustain period alternately, the power loss is halved by separating the power recovery circuit into two. In addition, since the -Vs voltage can be applied without using a separate power supply (-Vs) to supply the -Vs voltage, the power circuit (-Vs) can be removed, thereby simplifying the configuration of the power supply circuit.

Claims (20)

A plasma display panel including a plurality of first electrodes and a plurality of second electrodes, and In the state where the voltages of the plurality of first electrodes are maintained at the first voltage, the second voltage higher than the first voltage and the second voltage higher than the first voltage and the first voltage of the plurality of second electrodes. Driving circuit alternately applying a third voltage as low as the difference Including; The drive circuit, A first switch having a first end connected to the plurality of second electrodes, A second switch having a first end connected to a first power supply for supplying the second voltage, and having a second end connected to the plurality of second electrodes; and The voltage of the positive electrode of the capacitor charging the second voltage corresponding to the difference between the second voltage and the first voltage is changed to the first voltage, and the voltage of the negative electrode of the capacitor is connected to the first switch. A switching unit for applying the third voltage to the plurality of second electrodes through the cathode of the capacitor Plasma display device comprising a. The method of claim 1, The switching unit, And a third switch electrically connected between the anode of the capacitor and a second power supply for supplying the first voltage to change the voltage of the anode of the capacitor to the first voltage. The method of claim 2, The switching unit, A fourth switch electrically connected between the first power supply and the anode of the capacitor, and And a fifth switch electrically connected between the cathode of the capacitor and the second power source. And the fourth switch and the fifth switch are turned on to charge the capacitor with the fourth voltage. The method of claim 2, The switching unit, A fourth switch electrically connected between the first power supply and the anode of the capacitor, and A diode further comprises an anode connected to the cathode of the capacitor and a cathode connected to the second power supply. And the fourth voltage is charged in the capacitor when the fourth switch is turned on. The method of claim 2, The switching unit, And a fourth switch electrically connected between the cathode of the capacitor and the second power source. A second end of the second switch is connected to an anode of the capacitor, And the fourth voltage is charged in the capacitor when the second switch is turned on. The method of claim 2, The switching unit, A diode further comprises an anode connected to the cathode of the capacitor and a cathode connected to the second power supply. And the fourth voltage is charged in the capacitor when the second switch is turned on. The method according to any one of claims 1 to 6, And the second voltage and the third voltage have the same magnitude and opposite signs. The method according to any one of claims 1 to 6, The drive circuit, First and second inductors having first ends connected to the plurality of second electrodes, respectively; A first capacitor charging a fifth voltage between the first voltage and the second voltage, A sixth switch connected between the second end of the first inductor and the first capacitor to operate to increase voltage of the plurality of second electrodes; A seventh switch connected between the second end of the first inductor and the first capacitor to operate to reduce voltages of the plurality of second electrodes; A second capacitor charging a sixth voltage between the first voltage and the third voltage, An eighth switch connected between the second end of the second inductor and the second capacitor to operate to increase voltage of the plurality of second electrodes; and A ninth switch connected between a second end of the second inductor and the second capacitor to operate to reduce voltages of the plurality of second electrodes; Plasma display device comprising a. delete The method of claim 8, In a state in which the plurality of second electrodes is substantially maintained at the third voltage, the eighth switch is turned on to increase the voltages of the plurality of second electrodes and the sixth switch is turned on so that the plurality of second electrodes are turned on. And further increasing the voltage of the electrode and then applying the second voltage to the plurality of second electrodes. The method of claim 8, In a state in which the plurality of second electrodes is substantially maintained at the second voltage, the seventh switch is turned on to decrease the voltages of the plurality of second electrodes, and the ninth switch is turned on so that the plurality of second electrodes are turned on. And after the voltage of the second electrode is further reduced, the third voltage is applied to the voltage of the second electrode. A second voltage higher than the first voltage and the first voltage to the second electrode while the first electrode of the plasma display panel including a plurality of first electrodes and a plurality of second electrodes is maintained at a first voltage. In the driving method of the plasma display device to alternately apply a third voltage lower than the difference between the second voltage and the first voltage, Applying the second voltage to the second electrode, Reducing the voltage of the second electrode at the second voltage, The anode of the capacitor charging the fourth voltage corresponding to the difference between the second voltage and the first voltage is electrically connected to a first power supply for supplying the first voltage and through the cathode of the capacitor. Applying the third voltage to the, and And increasing the voltage of the second electrode at the third voltage. The method of claim 12, And a fourth voltage charged to the capacitor when the second voltage is applied to the second electrode. The method of claim 13, The method of driving the plasma display device having the same magnitude as that of the second voltage and the third voltage. The method of claim 14, The changing of the voltage of the second electrode from the second voltage to the third voltage and from the third voltage to the second voltage is performed in a resonance path formed by an inductor connected to the plurality of second electrodes. A method of driving a plasma display device. The method of claim 15, The step of changing the voltage of the second electrode from the second voltage to the third voltage, Reducing the voltage of the second electrode through a first inductor electrically connected to the second electrode, and And reducing the voltage of the second electrode through a second inductor electrically connected to the second electrode. The method of claim 15, The step of changing the voltage of the second electrode from the third voltage to the second voltage, Increasing the voltage of the second electrode through a first inductor electrically connected to the second electrode, and And increasing the voltage of the second electrode through a second inductor electrically connected to the second electrode. A driving method of a plasma display device in which a panel capacitor is formed by a first electrode and a second electrode, In a sustain period in which a second voltage higher than the first voltage and a third voltage lower than the first voltage are alternately applied to the second electrode while the voltage of the first electrode is maintained at the first voltage. Applying the third voltage to the second electrode, Changing the voltage of the second electrode through resonance of the inductor and the panel capacitor electrically connected to the second electrode, and And applying the third voltage to the second electrode using a capacitor electrically connected to the first power supply for supplying the second voltage to charge the second voltage. The method of claim 18, And the second voltage is charged to the capacitor when the second voltage is applied to the second electrode. The method of claim 19, Applying the second voltage to the second electrode, Changing the voltage of the second electrode through resonance of the inductor and the panel capacitor, and And applying the second voltage to the second electrode.

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