KR100484680B1 - A driving circuit of plasma display panel - Google Patents

Abstract

The present invention relates to a power supply circuit of a plasma display panel using a low breakdown voltage switching element and having a simple circuit configuration.

A first voltage is charged at both ends of the first capacitor of the power supply circuit, and a first voltage and a second voltage having the same magnitude and opposite polarity are output from the first and second terminals, respectively. The first voltage output from the first end of the first capacitor is supplied to one end of the panel capacitor through the first switch, and the second voltage output from the second end of the first capacitor is connected to the one end of the panel capacitor through the second switch. Supplied to.

In the second capacitor, a first end is electrically connected to the first end or the second end of the first capacitor, and both ends are charged to a predetermined voltage. A driving signal for driving the first or second switch is generated based on the switch driving voltage output from the second end of the second capacitor.

Description

A driving circuit of the plasma display panel {A DRIVING CIRCUIT OF PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus of a plasma display panel (PDP), and more particularly to a power supply circuit of a plasma display panel.

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

PDPs are flat display devices that display characters or images using plasma generated by gas discharge, and dozens to millions or more of pixels are arranged in a matrix according to their size. Such PDPs are classified into a direct current type (DC type) and an alternating current type (AC type) according to the shape of the driving voltage waveform applied and the structure of the discharge cell.

In the DC-type PDP, since the electrode is exposed to the discharge space as it is, the current flows in the discharge space while voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made for this purpose. On the other hand, in the AC type PDP, the electrode covers the dielectric layer, so the current is limited by the formation of a natural capacitance component, and the electrode is protected from the impact of ions during discharge.

1 is a partial perspective view of an AC plasma display panel.

As shown in FIG. 1, a scan electrode 4 and a sustain electrode 5 covered with a dielectric layer 2 and a protective film 3 are arranged in parallel on the first glass substrate 1. A plurality of address electrodes 8 are provided on the second glass substrate 6, and the address electrodes 8 are covered by the insulator layer 7. A partition 9 is formed on the insulator layer 7 between the address electrodes 8 in parallel with the address electrode 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both side surfaces of the partition wall 9. The first glass substrate 1 and the second glass substrate 6 have a discharge space 11 therebetween so that the scan electrode 4 and the address electrode 8 and the sustain electrode 5 and the address electrode 8 are orthogonal to each other. They are arranged to face each other. The discharge space at the intersection of the address electrode 8 and the pair of the scanning electrode 4 and the sustain electrode 5 forms the discharge cell 12.

2 shows an electrode arrangement diagram of the plasma display panel.

As shown in Fig. 2, the PDP electrode has a matrix structure of m x n. Specifically, the address electrodes A1 to Am are arranged in the column direction, and the scan electrodes Y1 to n rows in the row direction. Yn) and sustain electrodes X1 to Xn are arranged in a zigzag. Hereinafter, the scanning electrode will be referred to as "Y electrode" and the sustain electrode as "X electrode". The discharge cell 12 shown in FIG. 2 corresponds to the discharge cell 12 shown in FIG.

The sustain discharge voltage formed by the X side circuit (not shown) and the Y side circuit (not shown) is applied to the X electrode and the Y electrode, respectively. The X-side circuit and the Y-side circuit have a power supply circuit. Since the power supply voltage used for the plasma display panel is a high voltage, the power supply circuit had to use a switching element having a high breakdown voltage.

Since the use of such a high breakdown voltage element causes an increase in manufacturing cost, development of a power supply circuit capable of using a low breakdown voltage switching element has been required. As an example of such a power supply circuit, a power source described in Korean Patent Publication No. 2001-0007548 There is a circuit.

3 is a view showing a conventional power supply circuit mentioned in the above-mentioned cited technology.

As shown in FIG. 3, the conventional power supply circuit includes an X-side power supply circuit 10 and a Y-side power supply circuit 20.

As shown in Fig. 3, the X-side power supply circuit 10 has one end connected to a contact between transistors M1 and M2 and transistors M1 and M2 connected in series between the power supply voltage Vs and the ground voltage. The capacitor C includes a transistor M3 connected between the other end of the capacitor and the ground voltage, and transistors M4 and M5 connected in series between one end and the other end of the capacitor C. The contacts between the transistors M5 and M5 are connected to one end of the panel capacitor Cp.

The operation of the X-side power supply circuit 10 shown in FIG. 3 is as follows.

First, transistors M1 and M3 are turned on and other switches are turned off to charge both ends of capacitor C to voltage Vs.

In this state, the voltage of Vs and the voltage of -Vs are alternately supplied to one end (X electrode) of panel capacitor Cp from one end and the other end of capacitor C, respectively.

Specifically, by turning on the transistors M1 and M3 and turning off the transistor M2, a voltage Vs is generated from one end of the capacitor C, and the generated voltage Vs is turned on to turn the transistor M4 on the panel capacitor Cp. Once delivered. Meanwhile, the transistors M1 and M3 are turned off and the transistor M2 is turned on to generate the voltage -Vs from the other end of the capacitor C, and the generated voltage -Vs is turned on to the transistor M5 to turn on the panel capacitor Cp. At one end.

Although the circuit configuration of the Y-side power supply circuit 20 is not shown in Fig. 3, the circuit configuration of the Y-side power supply circuit 20 is substantially the same in configuration and operation as the X-side power supply circuit 10.

However, while the X-side power supply circuit 10 applies the Vs voltage to one end of the panel capacitor Cp, the Y-side power supply circuit 20 applies the -Vs voltage to the other end of the panel capacitor Cp and the X-side power supply. The Y-side power supply circuit 20 applies the Vs voltage to the other end of the panel capacitor Cp while the circuit 10 applies the -Vs voltage to one end of the panel capacitor Cp.

That is, according to the power supply circuit described in Korean Patent Laid-Open No. 2001-0007548, + Vs voltage (or -Vs voltage) and -Vs voltage (or Vs voltage) are applied to one end and the other end of the panel capacitor, respectively. At both ends, 2Vs voltage and -2Vs voltage are applied.

As described above, according to the conventional power supply circuit, although the voltage between both ends of the panel capacitor corresponding to the discharge voltage for discharging the plasma gas is 2Vs (-2Vs), only the Vs voltage is between the drain and the source of each transistor. Because of this, there is an advantage that the power circuit can be configured by using a low breakdown voltage (Vs).

By the way, according to the power supply circuit shown in Fig. 3, in order to apply the gate-source voltage Vgs for driving the transistors M4 and M5 when the -Vs voltage is applied to the source terminals of the transistors M4 and M5. The voltage corresponding to -Vs + Vgs must be applied separately. That is, according to the conventional circuit shown in Fig. 3, since the voltage applied to the gate must be generated separately when the voltage of -Vs is applied to the source terminal of the transistor, the number of driving power sources increases, the circuit becomes so complicated that the cost increases. there was.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the problems of the prior art, and to provide a power supply circuit for a plasma display panel having a simple circuit structure and using a low breakdown voltage circuit device.

The driving circuit of the plasma display panel according to an aspect of the present invention for achieving the above object is a driving circuit of the plasma display panel for applying a sustain discharge voltage to the panel capacitor formed between the first electrode and the second electrode,

A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And a second power supply circuit alternately applying the second voltage or the first voltage to the second electrode.

The first power circuit

A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor; A second switch for switching the second voltage output from the second end of the first capacitor; A second capacitor electrically connected to the second end of the first capacitor and having a third voltage charged between the first end and the second end; A third switch connected between the second end of the second capacitor and the third voltage; And a switch driver for generating a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor.

On the other hand, the driving circuit of the display panel according to another feature of the present invention is a driving circuit of the plasma display panel for applying a sustain discharge voltage to the panel capacitor formed between the first electrode and the second electrode,

A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And a second power supply circuit alternately applying the second voltage or the first voltage to the second electrode.

The first power circuit

A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor; A second switch for switching the second voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a third voltage charged between the first end and the second end; A diode having an anode and a cathode electrically connected between a second end of the second capacitor and the third voltage, respectively; And a switch driver for generating a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor.

On the other hand, the driving circuit of the plasma display panel according to another aspect of the present invention is a driving circuit of the plasma display panel for applying a sustain discharge voltage to the panel capacitor formed between the first electrode and the second electrode,

A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And a second power supply circuit alternately applying the second voltage or the first voltage to the second electrode.

The first power circuit

A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor; A second switch for switching the second voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a third voltage charged between the first end and the second end; A zener diode connected between the second terminal of the second capacitor and a ground voltage and having a clamping voltage corresponding to the third voltage; And a switch driver for generating a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor.

On the other hand, the power supply circuit according to one feature of the present invention

A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the second end of the first capacitor and having a sixth voltage charged between the first end and the second end; And a third switch connected between the second terminal and the seventh voltage of the second capacitor,

A driving signal for driving the first or second switch is generated based on an eighth voltage output from the second terminal of the second capacitor.

On the other hand, the power supply circuit according to another feature of the present invention

A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a sixth voltage charged between the first end and the second end; And a diode having an anode and a cathode electrically connected between the second terminal and the seventh voltage of the second capacitor, respectively.

A driving signal for driving the first or second switch is generated based on an eighth voltage output from the second terminal of the second capacitor.

On the other hand, the power supply circuit according to another feature of the present invention

A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a sixth voltage charged between the first end and the second end; And a Zener diode connected between the second terminal of the second capacitor and the ground voltage and having a clamping voltage corresponding to a seventh voltage.

A driving signal for driving the first or second switch is generated based on an eighth voltage output from the second terminal of the second capacitor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a power supply circuit according to a first embodiment of the present invention.

As shown in FIG. 4, the power supply circuit according to the first embodiment of the present invention is connected to the first terminal (X electrode) of the panel capacitor to supply the sustain discharge voltage to the X side power supply circuit 100 and the panel capacitor. And a Y-side power supply circuit 200 connected to the second terminal (Y electrode) to supply a sustain discharge voltage.

As shown in FIG. 4, the X-side power supply circuit 100 has one end connected to a contact between the transistors M1 and M2 and the transistors M1 and M2 connected in series between the power supply voltage Vs and the ground voltage. Between the capacitor C0, the other end of the capacitor C0 and the ground voltage, the diode D connected between the anode and the cathode, and the transistors M4 and M5 connected in series between one end and the other end of the capacitor C0, respectively. Include. The contacts between the transistors M5 and M5 are connected to one end of the panel capacitor Cp.

In addition, the X-side power supply circuit 100 according to the first embodiment of the present invention is connected between the capacitor C1, one end of which is connected to the anode of the diode D, the other end of the capacitor C1, and the voltage Vcc. And a switch driver 110 for generating gate signals S1 and S2 applied to the gates of the transistors M4 and M5 based on the voltage Vgc at the other end of the capacitor C1. do.

The operation of the X-side power supply circuit 100 according to the first embodiment of the present invention shown in FIG. 4 will be described.

First, the transistor M1 is turned on, and the transistor M2 and the transistor M6 are turned off to charge both ends of the capacitor C0 to the voltage Vs.

In the state where both ends of capacitor C0 are charged to Vs, the voltage of Vs and the voltage of -Vs are alternately supplied to one end (X electrode) of panel capacitor Cp from one end and the other end of capacitor C0, respectively.

Specifically, to apply the voltage Vs to one end of the panel capacitor Cp, the transistor M1 is turned on and the transistor M2 is turned off to generate the voltage Vs from one end of the capacitor C0, and the generated voltage Vs is The transistor M4 is turned on and transferred to one end of the panel capacitor Cp.

Then, to apply the voltage -Vs to one end of the panel capacitor Cp, the transistor M1 is turned off and the transistor M2 is turned on to generate the voltage -Vs from the other end of the capacitor C0 (at this time, the diode D ) Is turned off due to a reverse voltage), and the generated voltage -Vs is turned on and transferred to one end of the panel capacitor Cp.

On the other hand, while the transistor M6 is turned on and the voltage at both ends of the capacitor C1 (the voltage applied to the capacitor C1 from the top to the bottom in the circuit shown in Fig. 4) is -Vcc, the other end of the capacitor C0 is -Vcc. When the voltage Vs is applied, the transistor M6 is turned off so that the voltage Vgc at the other end of the capacitor C1 becomes -Vs + Vcc. Here, Vs is a voltage for discharging the plasma display panel (for example, 190V), Vcc is a voltage relative to ground (for example, 15V), and Vgc is a floating switch, that is, a switch in which the source terminal is pulled to the-potential (transistor M4, Voltage for driving M5)).

The switch driving voltage Vgc is input to the switch driving unit 110 and the gate driving signals S1 and S2 applied to the gates of the transistors M4 and M5 when the -Vs voltage is applied to the panel capacitor Cp. In addition, when the output of the panel capacitor Cp is Vs (that is, when the transistor M1 is on and the transistor M2 is off), since the 0 V voltage is applied to the other end of the capacitor C0, the capacitor C1 is generated. At the other end of), the Vcc voltage is output. In other words, the switch driving voltage Vgc becomes Vcc. The switch driving voltage Vgc is input to the switch driving unit 110 and the transistors M4 and M5 when the voltage Vs is applied to the panel capacitor Cp. The gate driving signals S1 and S2 applied to the gate are generated. According to the first embodiment of the present invention, when the output of the panel capacitor Cp is Vs, the switch driving voltage Vgc is Vcc and the panel capacitor When the output of (Cp) is -Vs, since the switch driving voltage (Vgc) is different from each other by -Vs + Vcc, the voltage input to the switch driving unit 110 is actually different and the output of the capacitor (Cp) is Vs When the output of the capacitor Cp is -Vs, the gate driving signals S1 and S2 applied to the transistors M4 and M5 can be generated differently. In FIG. 4, the capacitor Cp is applied to the other end of the capacitor C1. Generating gate signals S1 and S2 from the switch driving voltage (Vgc = -Vs + Vcc, Vgc = Vcc) Circuit of the position driver 110 is configured by those skilled in the art belonging to the technical field of the present invention because it can be easily implemented by a description of the specific circuit configuration will be omitted.

As described above, in the X-side power supply circuit 100 according to the first embodiment of the present invention, the capacitor C1 and the transistor M6 are added to the conventional circuit shown in FIG. When the voltage Vs is applied to (Cp) and when the voltage -Vs is applied to the panel capacitor Cp, the transistors M4 and M5 are connected through different switch driving voltages Vgc applied to the other end of the capacitor C1. The gate driving signals S1 and S2 for driving can be generated differently. Therefore, when the Vs voltage and the -Vs voltage are applied to the panel capacitor Cp, a separate power supply is not required to apply different gate voltages, thereby making the circuit configuration simpler than in the related art.

Although the circuit configuration of the Y-side power supply circuit 200 is not shown in FIG. 4, since the circuit configuration of the Y-side power supply circuit 200 is substantially the same as that of the X-side power supply circuit 100, its overlapping description is omitted. do.

However, while the X-side power supply circuit 100 applies the Vs voltage to one end of the panel capacitor Cp, the Y-side power supply circuit 200 applies the -Vs voltage to the other end of the panel capacitor Cp and the X-side power supply. The Y-side power supply circuit 20 applies the Vs voltage to the other end of the panel capacitor Cp while the circuit 100 applies the -Vs voltage to one end of the panel capacitor Cp.

On the other hand, according to the power supply circuit according to the first embodiment of the present invention shown in Figure 4, in order to generate the switch drive voltage (Vgc), it must be charged and used at a timing that can be charged using the transistor M6. As described above, according to the power supply circuit according to the first embodiment of the present invention, since the charging is required at a specific time, the timing design of the gate signal is difficult.

The power supply circuits according to the second and third embodiments of the present invention described below are intended to compensate for the disadvantages of the first embodiment of the present invention.

5 is a diagram illustrating a power supply circuit according to a second embodiment of the present invention.

Hereinafter, duplicate descriptions of circuits and operations identical to those of the power supply circuit according to the first embodiment of the present invention shown in FIG. 4 will be omitted.

In the X-side power supply circuit 100 according to the second embodiment of the present invention, one end of the capacitor C0, that is, the other end of the capacitor C1 and the capacitor C1, one end of which is connected to the contacts between the transistors M1 and M2. A diode D2 is connected between the anode and the cathode, respectively, between the stage and the voltage Vcc.

The operation of the X-side power supply circuit 100 according to the second embodiment of the present invention shown in FIG. 5 will be described.

First, the transistor M1 is turned on, the transistor M2 is turned off to charge both ends of the capacitor C0 with the voltage Vs, and both ends of the capacitor C1 are charged with the voltage Vs-Vcc.

In the state where both ends of the capacitor C0 are charged to Vs, as described in the first embodiment of the present invention, the voltage of Vs and the voltage of -Vs are respectively applied to the panel capacitor Cp from one end and the other end of the capacitor C0. Are alternately supplied to one end (X electrode).

According to the power supply circuit according to the second embodiment of the present invention, the switch driving voltage Vgc is generated by the following method.

When the -Vs voltage is generated at the other end of the capacitor C0 (that is, when the transistor M1 is off and the transistor M2 is on), the ground voltage is applied to one end of the capacitor C1 and is connected to both ends of the capacitor C1. Since the voltage Vs-Vcc is charged, the voltage corresponding to -Vs + Vcc is output to the other end of the capacitor C1. The output voltage of the other end of the capacitor C1 is equal to the switch driving voltage Vgc of the present invention.

On the other hand, when the Vs voltage is generated at the other end of the capacitor C0 (that is, when the transistor M1 is on and the transistor M2 is off), since the Vs voltage is applied to one end of the capacitor C1, the capacitor C1 At the other end of Vcc, the voltage corresponding to Vcc is output.

Therefore, according to the second embodiment of the present invention, since the inexpensive diode D2 can be used instead of the transistor M6, it is advantageous in terms of manufacturing cost.

Further, according to the second embodiment of the present invention, since the voltage at the other end of the capacitor C1 is always higher by Vcc than the voltage at the other end of the capacitor C0 regardless of the switching of the transistors M1 and M2, the capacitor C1 This eliminates the need to charge the battery at a specific time, making it easier to design the timing of the gate signal.

6 is a diagram showing a power supply circuit according to a third embodiment of the present invention.

Hereinafter, duplicate descriptions of circuits and operations identical to those of the power supply circuit according to the second embodiment of the present invention shown in FIG. 5 will be omitted.

In the X-side power supply circuit 100 according to the third embodiment of the present invention, a zener diode ZD1 is connected to the other end of the capacitor C1 unlike in FIG. 5. The rated voltage of this Zener diode ZD1 is designed to be approximately the Vcc voltage (about 15 V) according to the first and second embodiments of the present invention.

According to the power supply circuit 100 according to the third embodiment of the present invention, since the other end of the capacitor C1 is clamped by Vcc by the zener diode ZD1, the switch driving voltage Vgc which is the voltage of the other end of the capacitor C1. ) Is always set higher by Vcc than the voltage at the other end of capacitor C0 as in the second embodiment of the present invention. Therefore, almost the same operation as that of the power supply circuit according to the second embodiment of the present invention is possible.

According to the third embodiment of the present invention, since the rated voltage of the zener diode is used without the need of applying a separate voltage Vcc from the outside, the circuit design is very simple and the manufacturing cost is low.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various other modifications and changes are possible.

For example, the above-described embodiment of the present invention has been described as an example of being used in a driving circuit of a plasma display panel, but it is also possible to use other low breakdown voltage and low cost power circuit.

As described above, according to the present invention, a power supply circuit having a low breakdown voltage element and having a simple circuit structure can be provided.

1 is a partial perspective view of an AC plasma display panel.

2 is an arrangement diagram of electrodes of a plasma display panel.

3 is a power circuit diagram of a conventional plasma display panel.

4 is a power circuit diagram of a plasma display panel according to a first embodiment of the present invention.

5 is a power circuit diagram of a plasma display panel according to a second embodiment of the present invention.

6 is a power circuit diagram of a plasma display panel according to a third embodiment of the present invention.

Claims (16)

In a driving circuit of a plasma display panel for applying a sustain discharge voltage to a panel capacitor formed between a first electrode and a second electrode, A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And A second power supply circuit configured to alternately apply the second voltage or the first voltage to the second electrode; The first power circuit A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor to supply the first voltage to one end of the panel capacitor; A second switch for switching the second voltage output from the second end of the first capacitor to supply the second voltage to one end of the panel capacitor; A second capacitor electrically connected to the second end of the first capacitor and having a third voltage charged between the first end and the second end; A third switch connected between the second end of the second capacitor and the third voltage; And And a switch driver configured to generate a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor. In a driving circuit of a plasma display panel for applying a sustain discharge voltage to a panel capacitor formed between a first electrode and a second electrode, A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And A second power supply circuit configured to alternately apply the second voltage or the first voltage to the second electrode; The first power circuit A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor to supply the first voltage to one end of the panel capacitor; A second switch for switching the second voltage output from the second end of the first capacitor to supply the second voltage to one end of the panel capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a third voltage charged between the first end and the second end; A diode having an anode and a cathode electrically connected between a second end of the second capacitor and the third voltage, respectively; And And a switch driver configured to generate a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor. In a driving circuit of a plasma display panel for applying a sustain discharge voltage to a panel capacitor formed between a first electrode and a second electrode, A first power supply circuit configured to alternately apply a first voltage or a second voltage having the same magnitude and opposite polarity to the first electrode; And A second power supply circuit configured to alternately apply the second voltage or the first voltage to the second electrode; The first power circuit A first voltage is charged between a first stage and a second stage, a ground voltage is applied to the second stage to output the first voltage from the first stage, and a ground voltage is applied to the first stage. A first capacitor outputting the second voltage from the second stage; A first switch for switching the first voltage output from the first end of the first capacitor to supply the first voltage to one end of the panel capacitor; A second switch for switching the second voltage output from the second end of the first capacitor to supply the second voltage to one end of the panel capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a third voltage charged between the first end and the second end; A zener diode connected between the second terminal of the second capacitor and a ground voltage and having a clamping voltage corresponding to the third voltage; And And a switch driver configured to generate a driving signal for driving the first or second switch based on a fourth voltage output from the second terminal of the second capacitor. The method according to any one of claims 1 to 3, Fourth and fifth switches connected in series between the first voltage and the ground voltage and having a contact electrically connected to the first end of the first capacitor; And And a sixth switch connected between the ground voltage and the second end of the first capacitor. The method of claim 4, wherein And the sixth switch is a diode in which an anode and a cathode are connected between the second terminal and the ground voltage of the first capacitor, respectively. The method according to any one of claims 1 to 3, And the fourth voltage is obtained by subtracting the first voltage from the third voltage. A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the second end of the first capacitor and having a sixth voltage charged between the first end and the second end; And A third switch connected between the second terminal and the seventh voltage of the second capacitor, A power supply circuit for generating a driving signal for driving the first or second switch based on an eighth voltage output from the second end of the second capacitor. A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a sixth voltage charged between the first end and the second end; And A diode having an anode and a cathode electrically connected between the second terminal and the seventh voltage of the second capacitor, respectively, A power supply circuit for generating a driving signal for driving the first or second switch based on an eighth voltage output from the second end of the second capacitor. A first voltage is charged between the first stage and the second stage, a second voltage is applied to the second stage to output a third voltage from the first stage, and a fourth voltage is applied to the first stage. A first capacitor configured to output a fifth voltage from the second stage; A first switch for switching the third voltage output from the first end of the first capacitor; A second switch for switching the fifth voltage output from the second end of the first capacitor; A second capacitor electrically connected to the first end of the first capacitor and having a sixth voltage charged between the first end and the second end; And A zener diode connected between a second end of the second capacitor and a ground voltage and having a clamping voltage corresponding to a seventh voltage, A power supply circuit for generating a driving signal for driving the first or second switch based on an eighth voltage output from the second end of the second capacitor. The method according to any one of claims 7 to 9, Fourth and fifth switches connected in series between the first voltage and the second voltage and having a contact electrically connected to the first end of the first capacitor; And And a sixth switch coupled between the second voltage and the second end of the first capacitor. The method of claim 10, And the sixth switch is a diode in which an anode and a cathode are connected between the second terminal and the second voltage of the first capacitor, respectively. The method of claim 11, And the second voltage is a ground voltage. The method according to any one of claims 7 to 9, And the second voltage and the fourth voltage are ground voltages. The method of claim 13, And the third voltage is equal to the first voltage, and the fifth voltage is equal in magnitude to the first voltage and opposite in polarity. The method of claim 14, And the eighth voltage is obtained by subtracting the first voltage from the sixth voltage. The method of claim 14, And the sixth voltage is the same as the seventh voltage.