KR100778445B1 - Plasma display, and driving device and method thereof - Google Patents

Abstract

An apparatus and a method for driving a plasma display device are provided to reduce a reactive power by removing a current opposite to a current path in an inductor while increasing or decreasing voltage of electrodes through the inductor. First and second ends of first and second transistors(Sr,Sf) are respectively connected to plural first electrodes. A first end of a first capacitor(Cs1) is connected to a first end of a second capacitor(Cs2). A first end of a third transistor(S2) is connected to a second end of the first transistor and a second end thereof is connected to a second end of the second capacitance. A first end of a fourth transistor(S1) is connected to a second end of the first capacitance and a second end thereof is connected to a second end of the second transistor. A first end of an inductor(L) is connected to a contact point between the first and second capacitors. An anode of a first diode(Dr) is connected to a second end of the inductor and a cathode thereof is connected to a contact point between the first and third transistors. A cathode of a second diode(Df) is connected to a second end of the inductor and an anode thereof is connected to a contact point between the second and fourth transistors.

Description

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

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

2 is a diagram illustrating sustain discharge pulses according to a first exemplary embodiment of the present invention.

3 is a schematic diagram of a sustain discharge circuit 510 according to a first embodiment of the present invention.

4 is a diagram illustrating signal timing of the sustain discharge circuit 510 according to the first embodiment of the present invention.

5A to 5D are diagrams illustrating operations of the sustain discharge circuit 510 of FIG. 3 according to the signal timing of FIG. 4, respectively.

6 illustrates a sustain discharge pulse according to a second embodiment of the present invention.

7 and 8 are views schematically showing a sustain discharge circuit according to the second and third embodiments of the present invention, respectively.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, a drive device thereof, and a driving method thereof, and more particularly, to an energy recovery circuit of a plasma display device.

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

In general, in a plasma display device, one frame is divided into a plurality of subfields to be driven, and a gray level is displayed by a combination of weights of subfields in which a display operation occurs among the plurality of subfields. Cells to be turned on and cells not to be turned on during the address period of each subfield are selected, and sustain discharge is performed on the cells to be turned on to actually display an image during the sustain period.

In order to perform this operation, a high level voltage and a low level voltage are alternately applied to an electrode which performs sustain discharge during the sustain period. At this time, since the two electrodes in which sustain discharge is generated serve as capacitive components, reactive power is required to apply a high level voltage or a low level voltage to the electrodes. Therefore, in the sustain discharge circuit of the plasma display device, an energy recovery circuit for recovering and reusing reactive power is used.

Such energy recovery circuits exist separately for the two electrodes, and each energy recovery circuit is provided with a transistor and a diode for increasing the voltage of the electrode and a transistor and a diode for decreasing the voltage of the electrode, respectively. In the energy recovery circuit, a clamping diode is formed to clamp the voltage of the inductor so that the voltage of the inductor does not exceed the allowable voltage. At this time, after increasing the voltage of the electrode through the inductor or decreasing the voltage of the electrode through the inductor, the direction opposite to the current direction formed in the inductor while increasing the voltage of the electrode or decreasing the voltage of the electrode The current of is freewheeled through the clamping diode. This increases reactive power, resulting in higher power consumption.

SUMMARY OF THE INVENTION The present invention provides a plasma display device and a driving device capable of preventing freewheeling of a current in a direction opposite to a current direction formed in an inductor while increasing the voltage of the electrode or decreasing the voltage of the electrode. And a method of driving the same.

According to one aspect of the present invention, a plasma display device is provided. The plasma display device includes a plurality of first electrodes, a first transistor having a first end connected to the plurality of first electrodes, a second transistor having a second end connected to the plurality of first electrodes, and a first capacitor. A second capacitor having a first end connected to a first end of the first capacitor, a first end connected to a second end of the first transistor, and a second end connected to a second end of the second capacitor A third transistor, a fourth transistor having a first end connected to a second end of the first capacitor and a second end connected to a second end of the second transistor, and a contact point of the first and second capacitors An inductor having a first end coupled thereto, an anode connected to a second end of the inductor, a cathode connected to a contact point of the first and third transistors, and a cathode connected to a second end of the inductor. Connected to the second and fourth transistors And a second diode is the anode is connected to the contact point.

According to another aspect of the present invention, a method of driving a plasma display device including a first electrode is provided. The driving method includes a first capacitor having a first end connected to a first power supply for supplying a first voltage, and a second voltage connected to a second end of the first capacitor and higher than the first voltage. Providing a second capacitor having a second end connected to a second power source, injecting energy stored in the first capacitor into the first electrode by flowing a current in a first direction to an inductor connected to the first electrode; And applying the first voltage to the first electrode through the second power supply, and the current formed in the opposite direction to the first direction to the inductor while the first voltage is applied to the first electrode. Recovering energy from the second capacitor; recovering energy stored in the first electrode into the first capacitor by flowing a current in a second direction through the inductor; Applying the second voltage to a pole, and recovering a current formed in the inductor in a direction opposite to the second direction to the first capacitor while the second voltage is applied to the first electrode; do.

According to still another feature of the present invention, a driving apparatus of a plasma display device including a plurality of first electrodes and a plurality of second electrodes is provided. The driving device includes a first transistor connected to a first power supply for supplying a first voltage, a second transistor connected between the first transistor and the plurality of first electrodes, and a second lower than the first voltage. A third transistor connected to a second power supply for supplying a voltage, a fourth transistor connected between the third transistor and the plurality of first electrodes, and a first capacitor connected to a first end of the first power supply A second end connected to a second end of the first capacitor and a second end connected to the second power supply, and a first end connected to a contact point of the first and second capacitors An inductor, a rising path for causing a current to flow from a first end of the inductor to a second end, thereby increasing voltages of the plurality of first electrodes between the second end of the inductor and the contacts of the first and second transistors; And a falling path that causes a current to flow from the second end of the inductor to the first end, thereby reducing a voltage of the plurality of first electrodes between the first of the inductor and the contacts of the third and fourth transistors. . In this case, while the first and second transistors are turned on, a current formed from the second end of the inductor to the first end is recovered to the second capacitor through the falling path, and the third and fourth transistors are turned on. Current flows from the first end to the second end of the inductor to the first capacitor through the rising path.

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.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the expression that the voltage is maintained throughout the specification indicates that even if the potential difference between two specific points changes over time, the change is within an allowable range in the design or the cause of the change is due to parasitic components that are ignored in the design practice of those skilled in the art. Include cases by. In addition, since the threshold voltage of a semiconductor device (transistor, diode, etc.) is very low compared to the discharge voltage, the threshold voltage is regarded as 0V and approximated.

First, a plasma display device, a driving device thereof, 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, and FIG. 2 is a diagram illustrating a sustain discharge pulse according to a first 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. And a power supply unit 600.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as "A electrodes") A1-Am extending in the column direction, and a plurality of sustain electrodes extending in pairs with each other in the row direction (hereinafter, " X electrodes "(X1-Xn) and scan electrodes (hereinafter referred to as" Y electrodes ") (Y1-Yn). In general, the X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and the X and Y electrodes perform a display operation for displaying an image in the sustain period. The Y electrodes Y1-Yn and the X electrodes X1-Xn are arranged to be orthogonal to the A electrodes A1-Am. At this time, the discharge space at the intersection of the A electrodes (A1-Am) and the X and Y electrodes (X1-Xn, Y1-Yn) forms a cell (110). 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 includes an address period and a sustain period.

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

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

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

Specifically, during the address period of each subfield, the address electrode, the scan electrode, and the sustain electrode driver 300, 400, and 500 select a discharge cell to be turned on and a discharge cell not to be turned on from the plurality of discharge cells 110. . During the sustain period of each subfield, as shown in FIG. 2, the scan electrode driver 400 maintains the high level voltage Vs and the low level voltage 0V alternately with the plurality of Y electrodes Y1 -Yn. The discharge pulse is applied a number of times corresponding to the weight of the corresponding subfield. The sustain electrode driver 500 applies a sustain discharge pulse to the plurality of X electrodes X1-Xn in a phase opposite to that of the sustain discharge pulse applied to the Y electrodes Y1-Yn. In this way, the voltage difference between each Y electrode and each X electrode alternates between the Vs voltage and the -Vs voltage, so that the sustain discharge is repeated a predetermined number of times in the discharge cell to be turned on.

The power supply unit 600 supplies power required for the operation of the controller 200, the address electrode, the scan electrode, and the sustain electrode driver 300, 400, 500. In general, the power supply unit 600 may include a switching mode power supply (hereinafter, referred to as “SMPS”) that generates a DC voltage from an AC power source.

Next, the sustain discharge circuit which supplies the sustain discharge pulse of FIG. 2 is demonstrated in detail with reference to FIG. 3, FIG. 4, and FIGS. 5A-5D.

3 is a schematic diagram of a sustain discharge circuit 510 according to a first embodiment of the present invention. In FIG. 3, only the sustain discharge circuit 510 connected to the plurality of X electrodes X1 to Xn is illustrated for convenience of description, and the sustain discharge circuit 510 may be formed in the sustain electrode driver 500 of FIG. 1. have. The sustain discharge circuit 410 connected to the plurality of Y electrodes Y1-Yn may also have the same structure as the sustain discharge circuit 510 of FIG. 3, and may have a structure different from that of the sustain discharge circuit 510 of FIG. 3. It may be.

The sustain discharge circuit 510 may be connected to the plurality of X electrodes X1 to Xn in common, or may be connected to only some of the plurality of X electrodes X1 to Xn. In the sustain discharge circuit 510, only one X electrode X and one Y electrode Y are illustrated for convenience of description, and a capacitive component formed by the X electrode X and the Y electrode Y is illustrated. It is shown as a panel capacitor Cp.

As shown in FIG. 3, the sustain discharge circuit 510 includes transistors S1, Sr, Sf and S2, an inductor L, diodes Dr and Df and capacitors Cs1 and Cs2. In FIG. 3, transistors S1, Sr, Sf, and S2 are shown as n-channel field effect transistors, in particular, n-channel metal oxide semiconductor (NMOS) transistors. The body diode can be formed in the direction. And other transistors having similar functions instead of NMOS transistors may be used as these transistors S1, Sr, Sf, S2. In FIG. 3, the transistors S1, Sr, Sf, and S2 are illustrated as one transistor, but the transistors S1, Sr, Sf, and S2 may be formed of a plurality of transistors connected in parallel, respectively.

3, the source of the transistor Sr and the drain of the transistor Sf are connected to the X electrode. The drain of the transistor Sr is connected to the source of the transistor S1 and the drain of the transistor S1 is connected to a power supply Vs that supplies the high level voltage Vs of the sustain discharge pulse. The source of the transistor Sf is connected to the drain of the transistor S2 and the source of the transistor S2 is connected to the ground terminal 0 which supplies the low level voltage (0V) of the sustain discharge pulse. Two capacitors Cs1 and Cs2 are connected in series between the power supply Vs and the ground terminal 0. That is, the first end of the capacitor Cs2 is connected to the power supply Vs, and the second end of the capacitor Cs2 is connected to the first end of the capacitor Cs1. The second end of the capacitor Cs1 is connected to the ground terminal 0. Here, if the capacitances of the capacitors Cs1 and Cs2 are approximately equal, the two capacitors Cs1 and Cs2 are charged with the voltage Vs / 2, respectively.

The anode of the diode Dr is connected to the second end of the inductor L having the first end connected to the contacts of the capacitors Cs1 and Cs2, and the cathode of the diode Dr is the transistors S1 and Sr. It is connected to the contact between them. In addition, a cathode of the diode Df is connected to the second end of the inductor L, and an anode of the diode Df is connected to a contact between the transistors Sf and S2. At this time, the diode Dr forms a rising path that increases the voltage of the X electrode when the transistor Sr is turned on, and the diode Df reduces the voltage of the X electrode when the transistor Xf is turned on. To form. In addition, the diode Df receives the reverse current formed from the second end of the inductor L to the first end after the voltage of the X electrode is increased through the current path from the first end of the inductor L to the second end. The current path recovers to the capacitor Cs1, and the diode Dr reduces the voltage of the X electrode through the current path from the second end to the first end of the inductor L, and then the first A current path for recovering the reverse current formed from the first stage to the second stage to the capacitor Cs2 is formed.

Next, the operation of the sustain discharge circuit 510 of FIG. 3 will be described in detail with reference to FIGS. 4 and 5A to 5D.

4 is a diagram illustrating signal timing of the sustain discharge circuit 510 according to the first embodiment of the present invention, and FIGS. 5A to 5D are views of the sustain discharge circuit 510 of FIG. 3 according to the signal timing of FIG. 4, respectively. It is a figure which shows operation | movement.

First, referring to FIGS. 4 and 5A, in the mode 1 M1, the transistor S2 is turned off and the transistor Sr is turned on, so that the capacitor Cs1, the inductor L, and the diode are shown in FIG. 5A. Resonance occurs in the paths of Dr, transistor Sr, and panel capacitor Cp. Then, as the current flows from the first end of the inductor L to the second end, energy charged in the capacitor Cs1 is injected into the X electrode, so that the voltage Vx of the X electrode increases from the 0V voltage to the Vs voltage.

In mode 2 (M2), transistor S1 is turned on while transistor Sr is turned on, and as shown in FIG. 5B, the paths of power supply Vs, transistors S1 and Sr, and panel capacitor Cp are routed. The Vs voltage is applied to the X electrode through. As shown in FIG. 5B, after increasing the voltage Vx of the X electrode to the voltage Vs in the mode 1 M1, the current formed from the second end to the first end of the inductor L is grounded. The capacitor Cs1 is recovered through the body diode, the diode Df, the inductor L, and the capacitor Cs1 of the transistor S2.

In mode 3 M3, the transistors S1 and Sr are turned off and the transistor Sf is turned on, as shown in FIG. 5C, the panel capacitor Cp, the transistor Sf, the diode Df, and the inductor L. ) And resonance occurs in the path of the capacitor Cs1. As the current flows from the second end of the inductor L to the first end, the energy stored in the panel capacitor Cp is recovered to the capacitor Cs1 due to resonance, so that the voltage Vx of the X electrode is increased from the Vs voltage to the 0V voltage. Decreases.

In mode 4 M4, the transistor S2 is turned on while the transistor Sf is turned on, so that the paths of the panel capacitor Cp, the transistors Sf and S2, and the ground terminal 0 are as shown in FIG. 5D. Through the 0V voltage is applied to the X electrode. As shown in FIG. 5D, after the voltage Vx of the X electrode is reduced to 0V in the mode 3 (M3), the current formed from the first stage to the second stage of the inductor L is inductor L, The capacitor Cs2 is recovered through the diode Dr, the body diode of the transistor S1, and the capacitor Cs2.

As described above, in the first embodiment of the present invention, the mode 1 (M1) to the mode 4 (M4) are repeated the number of times corresponding to the weight of the subfield during the sustain period, so that the Vs voltage and the 0V voltage are alternately applied to the X electrode. Can be. In mode 2 (M2), while increasing the voltage of the X electrode in mode 1 (M1), the current in the opposite direction to that formed in the inductor L is removed, and in mode 4 (M4), mode 3 (M3) During the reduction of the voltage of the X electrode, the current in the direction opposite to the current direction formed in the inductor L is removed, thereby reducing the reactive power consumption.

As shown in FIG. 2, in the first embodiment of the present invention, the sustain discharge circuit 510 connected to the Y electrode applies a 0V voltage to the Y electrode and a 0V voltage to the X electrode while the Vs voltage is applied to the X electrode. The voltage Vs can be applied to the Y electrode while it is being applied.

6, except that the sustain discharge circuit 510 ′ according to the second embodiment of the present invention uses two capacitors Cs1 ′ and Cs2 ′ formed in the power supply unit 600. same. That is, the two capacitors Cs1 'and Cs2' are connected in series between the output terminal of the Vs voltage output from the SMPS (not shown) of the power supply unit 600 and the ground terminal, and the first terminal of the capacitor Cs2 '. Is supplied with the Vs voltage. The second end of the capacitor Cs2 'is connected to the first end of the capacitor Cs1', and the second end of the capacitor Cs1 'is connected to the ground terminal. That is, the two capacitors Cs1 'and Cs2' operate as a power supply for supplying the high level voltage Vs of the sustain discharge pulse, and the ground terminal 0 supplies a low level voltage (0V) of the sustain discharge pulse. It works. The voltages charged in the two capacitors Cs1 'and Cs2' may maintain the voltage Vs by the feedback operation of the SMPS. As described above, since the capacitor formed in the power supply unit 600 is used as the energy recovery capacitor in the second embodiment of the present invention, a separate capacitor may not be formed in the sustain discharge circuit.

In the first embodiment of the present invention, the case where the sustain discharge pulse having the high level voltage and the low level voltage are alternately applied to the X electrode and the Y electrode in the opposite phase has been described. The sustain discharge pulse may be applied to only one electrode. Hereinafter, such an embodiment will be described in detail with reference to FIGS. 7 and 8.

7 is a diagram illustrating a sustain discharge pulse according to a second embodiment of the present invention, and FIG. 8 is a diagram schematically illustrating a sustain discharge circuit 510 ″ according to a third embodiment of the present invention.

As shown in FIG. 7, in the second embodiment of the present invention, sustain discharge pulses having a voltage of Vs and a voltage of -Vs are alternately applied to the plurality of X electrodes X1-Xn during the sustain period. A voltage of 0 V is applied to (Y1-Yn). In this manner, the voltage difference between the X electrode and the Y electrode may alternately have a Vs voltage and a -Vs voltage in the same manner as the sustain discharge pulse of FIG. 2.

At this time, the sustain discharge circuit 510 "according to the third embodiment of the present invention has a power supply (-Vs) and a capacitor (Cs1, Cs2) for supplying the low level voltage (-Vs) of the sustain discharge pulse as shown in FIG. Except for the voltage charged in the same manner as in the first embodiment, the source and the capacitor Cs1 of the transistor S2 are connected to a power source (-Vs) that supplies a low level voltage (-Vs). Then, if two capacitors Cs are charged with a voltage of 2 Vs, and the capacities of the capacitors Cs1 and Cs2 are approximately equal, the two capacitors Cs1 and Cs2 may be charged with a voltage of Vs. The Vs voltage and the -Vs voltage may be alternately applied to the X electrode through the path as shown in FIGS. 5A to 5D.

In FIGS. 7 and 8, it is assumed that the sustain discharge circuit 510 'is connected to the X electrode and the 0V voltage is applied to the Y electrode, but the sustain discharge circuit is connected to the Y electrode and the 0V voltage may be applied to the X electrode. have.

In the circuit of FIG. 8, the drain of transistor S1 and the first end of capacitor Cs2 are connected to a power supply for supplying a Vs / 2 voltage, and the source of transistor S2 and the second end of capacitor Cs1. Is connected to a power supply for supplying a -Vs / 2 voltage, a sustain discharge pulse having an alternating voltage of Vs / 2 and -Vs / 2 can be applied to the X electrode. At this time, the voltage Vs / 2 corresponding to half of the voltage Vs / 2 and -Vs / 2 is charged in the capacitor Cs. In this case, the sustain discharge pulse having the Vs / 2 voltage and the -Vs / 2 voltage alternately applied to the Y electrode can be applied in the opposite phase to the sustain discharge pulse applied to the X electrode.

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 current in the opposite direction to the current path formed in the inductor can be removed while increasing or decreasing the voltage of the electrode through the inductor in the sustain discharge circuit, thereby reducing the reactive power.

Claims (15)

A plurality of first electrodes, A first transistor having a first end connected to the plurality of first electrodes, A second transistor having a second end connected to the plurality of first electrodes, A first capacitor, A second capacitor having a first end connected to the first end of the first capacitor, A third transistor having a first end connected to a second end of the first transistor and a second end connected to a second end of the second capacitor, A fourth transistor having a first end connected to a second end of the first capacitor and a second end connected to a second end of the second transistor, An inductor having a first end connected to a contact point of the first and second capacitors, A first diode having an anode connected to the second end of the inductor and a cathode connected to the contacts of the first and third transistors, and A second diode having a cathode connected to the second end of the inductor and an anode connected to the contacts of the second and fourth transistors; Plasma display device comprising a. The method of claim 1, And the first to fourth transistors each including a body diode formed from a first end to a second end. The method according to claim 1 or 2, Further comprising a power supply for generating a DC voltage from the AC power source, And the first and second capacitors are formed in the power supply unit. The method of claim 3, The power supply unit includes a switching mode power supply, And an output terminal of the switching mode power supply device is connected to a second terminal of the second capacitor, and a second terminal of the first capacitor is connected to a ground terminal. The method according to claim 1 or 2, And a second voltage supplied from a second end of the second capacitor, and a second voltage lower than the first voltage from a second end of the first capacitor. The method of claim 5, A plurality of second electrodes performing sustain discharge together with the plurality of first electrodes, and The second voltage is applied to the plurality of second electrodes while the first voltage is applied to the plurality of first electrodes, and the second plurality of second electrodes is applied to the plurality of first electrodes. Driver for applying the first voltage to the electrode Plasma display device further comprising. The method of claim 5, The first transistor is turned on for a first period, the third transistor is turned on with the first transistor turned on for a second period, and the third transistor is turned on for a third period. And a controller configured to set the fourth transistor to a turned-on state while the third transistor is turned on for a fourth period of time. In the driving method of a plasma display device including a first electrode, A first capacitor having a first end connected to a first power supply supplying a first voltage, and a second power supply having a first end connected to a second end of the first capacitor and supplying a second voltage higher than the first voltage. Providing a second capacitor having a second stage connected thereto; Injecting energy stored in the first capacitor into the first electrode by flowing a current in a first direction through an inductor connected to the first electrode; Applying the first voltage to the first electrode through the second power source, Recovering a current formed in the inductor in a direction opposite to the first direction to the second capacitor while the first voltage is applied to the first electrode, Recovering energy stored in the first electrode to the first capacitor by flowing a current in a second direction through the inductor; Applying the second voltage to the first electrode via the first power source, and Recovering a current formed in the inductor in a direction opposite to the second direction to the first capacitor while the second voltage is applied to the first electrode; Driving method comprising a. The method of claim 8, The plasma display apparatus further includes a second electrode which performs a sustain discharge together with the first electrode. The step of applying the second voltage to the first electrode includes the step of applying the first voltage to the second electrode, And applying the first voltage to the first electrode comprises applying the second voltage to the second electrode. The method of claim 8, The plasma display apparatus further includes a second electrode which performs a sustain discharge together with the first electrode. Applying the first voltage to the first electrode and applying the second voltage to the first electrode apply a third voltage between the first voltage and the second voltage to the second electrode, respectively. Driving method comprising the step of. In the driving device of the plasma display device including a plurality of first electrodes and a plurality of second electrodes, A first transistor connected to a first power supply for supplying a first voltage, A second transistor connected between the first transistor and the plurality of first electrodes, A third transistor connected to a second power supply for supplying a second voltage lower than the first voltage; A fourth transistor connected between the third transistor and the plurality of first electrodes, A first capacitor having a first end connected to the first power source, A second capacitor having a first end connected to a second end of the first capacitor and a second end connected to the second power source, An inductor having a first end connected to a contact point of the first and second capacitors, A rising path for increasing a voltage of the plurality of first electrodes between the second end of the inductor and the contacts of the first and second transistors by allowing a current to flow from the first end of the inductor to the second end; and A falling path that causes a current to flow from the second end of the inductor to the first end so as to reduce the voltage of the plurality of first electrodes between the first and the third and fourth transistor contacts of the inductor; Including; While the first and second transistors are turned on, a current formed from the second end of the inductor to the first end is recovered to the second capacitor through the falling path, And a current formed from the first end to the second end of the inductor is recovered to the first capacitor through the rising path while the third and fourth transistors are turned on. The method of claim 11, The first to fourth transistors each include a body diode. The method of claim 12, Turning on the first transistor to inject energy charged in the second capacitor into the first electrode through the rising path to increase the voltage of the first electrode, The second transistor is turned on while the first transistor is turned on to apply the first voltage to the first electrode. Turning on the third transistor to recover energy stored in the first electrode to the second capacitor through the falling path to reduce the voltage of the first electrode, And driving the fourth transistor to apply the second voltage to the first electrode while the third transistor is turned on. The method according to any one of claims 11 to 13, The second voltage is applied to the second electrode while the first voltage is applied to the first electrode, and the first voltage is applied to the second electrode while the second voltage is applied to the first electrode. Driven device. The method according to any one of claims 11 to 13, And a third voltage between the first voltage and the second voltage is applied to the second electrode while the first and second voltages are applied to the first electrode.

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