KR100508952B1 - Driving apparatus of plasma display panel and driving method thereof - Google Patents

Abstract

The present invention relates to a driving apparatus of a plasma display panel. When the capacitive load formed between the two electrodes is used in the power recovery circuit as it is, the power recovery operation occurs only when there is a voltage difference between the two electrodes. Here, a circuit for performing resonance with the inductor is connected to generate a voltage difference between the two electrodes before performing the power recovery operation between the two electrodes. In addition, when performing the power recovery operation between the two electrodes to make the voltage difference between the two electrodes to use the resonance through the circuit. That is, in the power recovery circuit which performs the power recovery operation by using the capacitive load of the panel as it is, when the voltages of the two electrodes are converted from the same voltage level to the other voltage level and the same voltage level at the same voltage level, The power consumption can be further reduced.

Description

A driving device of a plasma display panel and a driving method thereof {DRIVING APPARATUS OF PLASMA DISPLAY PANEL AND DRIVING METHOD THEREOF}

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

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

A plasma display panel is a flat panel display device that displays characters or images using plasma generated by gas discharge, and tens to millions or more of pixels are arranged in a matrix form according to their size. The plasma display panel is classified into a direct current type and an alternating current type according to a shape of a driving voltage waveform applied and a structure of a discharge cell.

In the DC plasma display panel, the electrode is exposed without the discharge space insulated, so that the current flows in the discharge space while the voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made. On the other hand, in the AC plasma display panel, since the electrode covers the dielectric layer, 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 a general plasma display panel, and FIG. 2 is a diagram showing an arrangement of electrodes of a general plasma display panel.

As shown in FIG. 1, the plasma display panel includes two glass substrates 1 and 6 facing each other apart. On the glass substrate 1, the scan electrode 4 and the sustain electrode 5 are formed in pairs and in parallel, and the scan electrode 4 and the sustain electrode 5 are covered with the dielectric layer 2 and the protective film 3. have. A plurality of address electrodes 8 are formed on the glass substrate 6, and the address electrodes 8 are covered with the insulator layer 7. The address electrode 8 and the partition 9 are formed on the insulator layer 7 between the address electrodes 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both sides of the partition wall 9. The glass substrates 1 and 6 are disposed to face each other with the discharge space 11 therebetween so that the scan electrode 4, the address electrode 8, the sustain electrode 5, and the address electrode 8 are orthogonal to each other. The discharge space 11 at the intersection of the address electrode 8 and the paired scan electrode 4 and the sustain electrode 5 forms a discharge cell 12.

As shown in FIG. 2, the electrode of the plasma display panel has a matrix structure of n × m. In the column direction, address electrodes A ₁ -A _m are arranged, and in the row direction, n rows of scan electrodes Y ₁ -Y _n and sustain electrodes X ₁ -X _n are arranged in pairs.

In general, the driving method of the AC plasma display panel includes a reset period, an address period, a sustain period, and an erase period.

 The reset period is a period for initializing the state of each cell in order to smoothly perform an addressing operation on the cell. The address period is an address voltage for a cell (addressed cell) that is turned on to select a cell that is turned on and a cell that is not turned on. It is a period of time to perform the operation of accumulating wall charge by applying a. The sustain period is a period in which discharge for actually displaying an image is performed on the addressed cell by applying a sustain discharge voltage pulse, and the erase period is a period in which the wall discharge of the cell is reduced to end the sustain discharge.

At this time, since the discharge space between the scan electrode and the sustain electrode, the surface on which the address electrode is formed, and the surface on which the scan and sustain electrode are formed serves as a capacitive load (hereinafter referred to as a panel capacitor), capacitance exists in the panel. Due to such a panel capacitor, in order to apply a waveform for sustain discharge in a sustain period, reactive power is required in addition to the power for discharge. A circuit for recovering and reusing such reactive power is called a power recovery circuit (or sustain discharge circuit).

Previously disclosed power recovery circuits are proposed by a series LC resonant type (LF Weber, US Patent No. 5,081,400), parallel LC resonant type (US Patent No. 5,670,974), series LCLC resonant type (US Patent No. 6,072,447), series There are many such as CLC resonant type (Korean Patent No. 227,300; US Patent No. 6,538,627). Among them, the series LC resonant type uses a separate capacitor to provide the middle level of the sustain discharge voltage, but the three methods except the series LC resonant type use the panel capacitor which is the capacitive load of the panel without an external capacitor. to be.

3 is a diagram illustrating a connection relationship between the scan electrodes Y1-Yn and the sustain electrodes X1-Xn between the power recovery circuit 30 when the conventional parallel LC resonance type is applied. Since the power recovery is mainly related to the sustain discharge pulse applied between the sustain electrode and the scan electrode in the sustain period, only the sustain electrode and the scan electrode are shown in FIG. 3 for convenience. As shown in FIG. 3, the scan electrodes Y1-Yn and the sustain electrodes X1-Xn each include an integrated power control circuit 30. In addition, the power recovery circuit 30 includes a sustain discharge unit 32 including switches for switching sustain discharge voltages to scan electrodes Y1-Yn, and a power recovery unit 34 including an inductor (coil), a switch, and a diode. ), A sustain discharge section 36 composed of switches for switching the sustain electrodes X1 to Xn.

4 is a diagram showing a connection relationship between the power recovery circuits 40 and 40 'of the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn when the conventional series CLC resonance type is applied. As shown in FIG. 4, the scan electrodes Y1-Yn and the sustain electrodes X1-Xn are electrodes VO1 and VO2 of odd lines and electrodes VE1 and VE2 of even lines, respectively. Is connected to. In this case, the first power recovery circuit 40 includes a sustain discharge unit 42 composed of switches for switching the sustain discharge voltage to the VO1 electrode, a power recovery unit 44 composed of an inductor (coil), a switch, and a diode, and a VE1 electrode. And a sustain discharge section 46 composed of switches for switching the sustain discharge voltage. The second power recovery circuit 40 'also includes components 42', 44 ', 46' corresponding to the first power recovery circuit 40.

In the case of the series LCLC resonant type, the positions of the VE1 electrodes of the scan electrodes Y1-Yn and the VE2 electrodes of the sustain electrodes X-Xn shown in FIG. 4 are changed.

3 and 4, the power recovery circuits of the parallel LC resonant type, the series CLC resonant type, and the series LCLC resonant type each include two sustain discharge parts and one power recovery part, and the circuit is one independent. It can be used as a bundle of phosphorus.

5 is a view briefly showing a power recovery circuit in the case of a series CLC resonant type of the conventional method. That is, FIG. 5 is a diagram showing the power recovery circuit 40 of the scan electrodes Y1-Yn among the power recovery circuits shown in FIG. In this case, the power recovery circuit of FIG. 5 may be similarly applied to the power recovery circuit of the sustain electrodes X1 to Xn.

As shown in FIG. 5, the conventional power recovery circuit includes two sustain discharge parts 42 and 46 and one power recovery part 44.

The two sustain discharge parts 42 and 46 include switches SW1 to SW4 for switching between VA and VB power sources, where VB <VA and VA-VB = sustain discharge voltage, and the switches SW1 and SW2. Are used to apply voltage VA and voltage VB to the VO1 electrode, and switches SW3 and SW4 are used to apply voltage VA and voltage VB to the VE1 electrode, respectively.

The power recovery unit 44 includes an inductor L connected between the VO1 electrode and the VE1 electrode, a diode D1 and a switch SW5 for controlling the positive direction of the current IL flowing through the inductor L. And a diode D2 and a switch SW6 for controlling the negative direction of the current IL. In addition, the power recovery unit 44 includes a clamping unit 44a for clamping the voltage VL of the contact point of the inductor L and the diodes D1 and D2, and the switch SW5 and the diode D1 operate. And a diode D3 for preventing the voltage VL from exceeding VA, and a diode D4 for preventing the voltage VL from dropping below VB after the switch SW6 and the diode D2 operate. . Here, the VO1 electrode forms a panel capacitor with the VO2 electrode, and the VE1 electrode forms a panel capacitor with the VE2 electrode.

In addition, the power recovery circuit 40 shown in FIG. 5 is characterized in that the power recovery unit 44 capable of power recovery only between the two electrodes (VO1, VE1). That is, the power recovery operation is performed by LC resonance between the VO1 electrode and the VE1 electrode. Therefore, when the voltage of the VO1 electrode is equal to the voltage of the VE1 electrode, or when the voltage is different from the same potential state, current recovery is impossible. That is, the conventional power recovery circuit as shown in FIG. 5 has a problem that power recovery is possible between the two when the voltage of the VO1 electrode and the voltage of the VE1 electrode are different. This is a very serious problem in waveform design. For example, if the VO1 electrode and the VE1 electrode after the address period have the same potential, a voltage must be applied to one of the electrodes through hard switching for power recovery in the sustain period. The sudden change in voltage due to hard switching not only consumes power but also increases noise.

This problem occurs not only in the series CLC resonance type shown in FIG. 5 but also in the parallel LC resonance type and the series LCLC resonance type.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-described problems of the related art, and to provide a driving apparatus of a plasma display panel which further reduces power consumption.

A driving apparatus of a plasma display panel according to a feature of the present invention for achieving the above object is

A plurality of first and second electrodes, and first and second panel capacitors formed on the first and second electrodes, respectively, wherein the first electrode and the first and second panel capacitors are directly used. In the driving device of the plasma display panel to form a charge and discharge path between the second electrode,

An inductor having a first end electrically connected to the first electrode;

A first switch electrically connected between the second end of the inductor and the second electrode to switch a path for charging from the first electrode to the second electrode;

A second switch electrically connected between the second end of the inductor and the second electrode to switch a path for charging from the second electrode to the first electrode;

And a third switch electrically connected between a second end of the inductor and a first power supply for supplying a first voltage to switch a path for charging from the first power supply to the first electrode. In addition, the driving apparatus of the plasma display panel further includes a fourth switch electrically connected between the second end of the inductor and the first power source to switch a path for discharging the first electrode.

The driving method of the plasma display panel according to another aspect of the present invention

A plurality of first and second electrodes, first and second panel capacitors formed on the first and second electrodes, respectively, and an inductor having a first end electrically connected to the first end of the first electrode. The method of driving a plasma display panel, wherein a charge and discharge path is formed between the first electrode and the second electrode by directly using the first and second panel capacitors.

(a) raising the first electrode to a first voltage by turning on a first switch electrically connected to the second end of the inductor;

(b) turning on a second switch electrically connected between the second end of the inductor and the second electrode to lower the first electrode to a second voltage lower than the first voltage and the second electrode to Raising to a first voltage;

(c) turning on a third switch electrically connected between the second end of the inductor and the second electrode to lower the second electrode to the second voltage and raise the first electrode to the first voltage; It comprises the step of. In this case, the driving method of the plasma display panel further includes the step of lowering the first electrode to the second voltage by turning on a fourth switch electrically connected to the second end of the inductor.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

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

6 illustrates a plasma display panel according to an exemplary embodiment of the present invention.

As shown in FIG. 6, the plasma display panel according to the embodiment of the present invention includes a plasma panel 100, an address driver 200, a scan / sustain driver 300, and a controller 400.

The plasma panel 100 includes a plurality of address electrodes A1-Am arranged in the column direction, a plurality of scan electrodes Y1-Yn arranged in parallel in the row direction, and a plurality of sustain electrodes X1-Xn. do. The sustain electrodes X1-Xn are formed corresponding to the scan electrodes Y1-Yn, and are generally connected to each other in common.

The address driver 200 receives an address drive control signal from the controller 400 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode.

The scan and sustain drive unit 300 includes a sustain discharge circuit, which receives an oil discharge signal from the controller and alternately inputs a sustain pulse voltage to the Y electrode and the X electrode. The sustain discharge occurs in the discharge cell selected by the input sustain pulse voltage.

The controller 400 receives an image signal from the outside, generates an address driving signal and a sustain discharge signal, and applies the same to the address driver 200 and the scan and sustain driver 300, respectively.

The scan / maintenance driver 300 according to the embodiment of the present invention includes a power recovery circuit 320 which is a circuit for recovering and reusing reactive power. The power recovery circuit 320 according to the embodiment of the present invention is illustrated in FIG. 7. Shown in

7 is a diagram illustrating a power recovery circuit 320 according to an embodiment of the present invention. 7 is a power recovery circuit of a series CLC resonant type, and the power recovery circuit 320 is connected to electrodes VO1 of odd lines and electrodes V02 of even lines of scan electrodes Y1-Yn, respectively. The power recovery operation is performed. The scan electrodes of odd-numbered lines connected to the VO1 electrodes are paired with the sustain electrodes of odd-numbered lines connected to the VO2 electrodes, respectively, to form a panel capacitor, and the even-numbered scan electrodes connected to the VE1 electrodes are VE2. A pair of capacitors are formed in pairs with the even-numbered sustain electrodes connected to the electrodes to form a panel capacitor.

Hereinafter, for convenience, the power recovery circuit 320 of the scan electrodes Y1-Yn will be described with reference to FIG. 7. The configuration and basic operation of the power recovery circuit at the sustain electrodes X1-Xn are the same as those in FIG. 7, and the switches are provided to provide a sustain discharge voltage between the scan electrodes Y1-Yn and the sustain electrodes X1-Xn. Since the timing only slightly varies, only the power recovery circuit 320 in the scan electrodes Y1-Yn will be described below.

As shown in FIG. 7, the power recovery circuit 320 according to an exemplary embodiment of the present invention uses a clamping power source VA or VB in a state in which the voltage of the electrode VO1 or VE1 is increased or decreased to some extent. First and second sustain discharge parts 322 and 326 for raising the final voltage; and a power recovery part 324 resonating between the VEI electrode and the VO1 electrode.

 The first sustain discharge unit 322 includes two switches SW1 and SW2 for switching the power supply VA and the power supply VB, respectively, and the contacts of the two switches SW1 and SW2 are connected to the VO1 electrode. . Meanwhile, the second sustain discharge unit 326 also includes two switches SW3 and SW4 for switching the power supply VA and the power supply VB, respectively, and are connected to the VE1 electrode. At this time, the switches SW1 and SW3 are connected to the power supply VA, and the switches SW2 and SW4 are connected to the power supply VB. Here, the difference VA-VB between the power source VA and the power source VB is a value corresponding to the sustain discharge voltage Vs applied to the scan electrode in the sustain period, and in general, the power source VA is the power source VB. Set it larger.

The power recovery unit 324 controls the direction of the positive (+) direction of the current IL flowing through the inductor L and the inductor L and the switch SW5 and the negative of the current IL. Diode D2 and switch SW6 for controlling the direction of-). In addition, the power recovery unit 324 includes a clamping unit 324a for clamping the voltage VL of the contact point of the inductor L and the diodes D1 and D2, and the switch SW5 and the diode D1 operate. Afterwards, the diode D3 for preventing the voltage VL from exceeding VA and the diode D4 for preventing the voltage VL from dropping below VB after the operation of the switch SW6 and the diode D2 are included.

The power recovery unit 324 includes a VC connection unit 324b for recovering power in such a manner that the voltage level of the VO1 electrode and the voltage level of the VE1 electrode are applied from the same level to another state and from the other level to the same level. . The VC connection 324b includes diodes D5 and D6, switches SW7 and SW8 and a power supply VC. Here, the power supply VC is a power supply for supplying a voltage corresponding to a value between the voltage level of the power supply VA and the voltage level of the power supply VB using the power recovery capacitor Cr (not shown). .

 In the power recovery unit 324, one side of the inductor L is electrically connected to the VO1 electrode and the other side is electrically connected to the contact point of the diode D1 and the diode D2. Diodes D1 and D2 are connected in series with switches SW5 and SW6, respectively. Diodes and switches D1-SW5 and D2-SW6 connected in series are connected in parallel between the other side of inductor L and the VE1 electrode. Connected. At this time, the switches SW5 and SW6 serve as charging and discharging means for charging and discharging between the VO1 electrode and the VE1 electrode, and the diodes D1 and D2 are respectively positive and negative in the inductor L. Used to control the direction of the negative.

In the VC connection 324b included in the power recovery unit 324, the diodes D5 and D6 and the switches SW7 and SW8 are connected in series, respectively, and the diodes and the switches D5-SW7 and D6 connected in series, respectively. SW8 are connected between the inductor L and the power supply VC in parallel with each other. Here, the switch SW7 raises the voltage level of the VO1 electrode to a value close to V0 to VA by using the inductor L, and the diode D5 obtains a current that can flow in the reverse direction after the operation of the switch SW7. It serves to prevent. The switch SW8 lowers the voltage level of the VO1 electrode from VA to VO by using the inductor L when the initial condition of the voltage level of the VO1 electrode is VA, and the diode D6 operates the switch SW8. It serves to prevent the current flowing in the reverse direction.

Hereinafter, the operation of the power recovery circuit 320 according to the embodiment of the present invention will be described in more detail with reference to FIGS. 8 and 9.

In this embodiment, it is also possible to lift VO1 alone using only the diode D5 and the switch SW7, excluding the diode D6 and the switch SW8.

Before performing the operation according to the embodiment of the present invention, it is assumed that the VO1 electrode and the VE1 electrode have a 0V voltage level. In addition, it is assumed that the power supply VC is charged with a voltage corresponding to approximately half of the VA voltage level and the VB voltage level in the power recovery capacitor Cr (not shown).

First, the voltage of the VE1 electrode is raised by LC resonance from the VB voltage level to the VA voltage level. As shown in FIG. 8, in the mode 1 M1, the switch SW7 and the switch SW4 are turned on. Then, as shown in FIG. 9A, a current path is formed through the power supply Vc, the switch SW7, the diode D5, and the inductor L to the VO1 electrode to generate LC resonance. At this time, the voltage level of the VO1 electrode rises to the VA voltage level as shown in FIG. Therefore, the voltage level of the V01 electrode becomes the VA voltage level, the voltage level of the VE1 electrode becomes the VB voltage level, and both electrodes (VO1 electrode and VE1 electrode) become different voltage levels.

In the operation after Mode 1, since the voltage levels of the VO1 electrode and the VE1 electrode are different from each other, a power recovery operation is performed between the VO1 electrode and the VE1 electrode.

In mode 2 M2, the switch SW1 is turned on and the switch SW4 remains turned on. Then, as shown in FIG. 9B, the VO1 electrode is switched to the VA voltage level, and the VE1 electrode is maintained at the VB voltage.

In mode 3 M3, the switch SW6 is turned on. Then, as shown in FIG. 9C, a voltage difference is generated between the VO1 electrode and the VE1 electrode, and a current path is formed through the V01 electrode, the inductor L, the diode D2, and the switch SW6 to the VE1 electrode, thereby causing LC resonance. Occurs. Through this, the voltage of the VO1 electrode drops to almost the VB voltage level, and the voltage of the VE1 electrode rises to the VA voltage level.

In mode 4 M4, the switch SW2 and the switch SW3 are turned on. Then, as shown in FIG. 9D, the voltage of the VO1 electrode becomes the VB voltage level, and the voltage of the VE1 electrode becomes the VA voltage level.

Next, in mode 5 (M5), switch S5 is turned on. Then, as shown in FIG. 9E, a voltage difference is generated between the VE1 electrode and the VO1 electrode, and a current path is formed through the switch SW5, the diode D1, and the inductor L to the VO1 electrode to generate LC resonance.

In mode 6 (M6), the switch SW1 and the switch SW4 are turned on so that the voltage level of the VO1 electrode becomes VA and the voltage level of the VE1 electrode becomes VB as shown in FIG. 9F.

After the operation as in Mode 6, the operation of Mode 3 (M3), Mode 4 (M4), Mode 5 (M5) and Mode 6 (M6) is repeated.

At this time, in the waveforms of the voltage applied from the VO1 electrode and the VE1 electrode in the operation of the mode 2 to the mode 6, the voltage is applied to the VO2 electrode and the VE2 electrode (see FIG. 4) in a similar manner to that of FIG. The sustain discharge voltage is applied between the VO2 electrode and the VE1 electrode and the VE2 electrode to perform a power recovery operation. Since a specific method thereof is disclosed in Korean Patent Publication No. 1999-0061691, detailed description thereof will be omitted below.

 In mode 7, the voltage level of the VO1 electrode and the voltage level of the VO2 electrode are made to be substantially the same voltage level VA. In mode 7, the switch SW7 is turned on while the switch SW3 is turned on. Then, as shown in Fig. 9G, a current path is formed through the power supply Vc, the switch SW7, the diode D5, and the inductor L to the VO1 electrode to generate LC resonance. At this time, the voltage level of the VO1 electrode rises substantially to the VA voltage level as shown in FIG.

Then, in mode 8, the switch SW1 is turned on while the switch SW3 is turned on to maintain the same voltage level of the VO1 electrode and the VE1 electrode at the VA voltage level. 9H shows the current path in mode 8. FIG. Accordingly, the voltage level of the V01 electrode becomes the VA voltage level, and the voltage level of the VE1 electrode is maintained as the VA voltage level so that the two electrodes (VO1 electrode and VE1 electrode) become the same voltage level.

Here, in the mode 1, the voltage level of the VO1 electrode is increased by LC resonance to VA in the state where the voltage levels of the VO1 electrode and the VO2 electrode are the same (VB voltage level), and the mode 7 is different voltage level (VB, VA) Raise the voltage to VA at the same voltage level using LC resonance. At this time, by using LC resonance using the diode D5 and the switch SW7, power recovery is possible.

8 and 9 illustrate only the case where only the diode D5 and the switch SW7 are used, the voltage levels of the two electrodes VO1 and VE1 are the same using the diode D6 and the switch SW8. You can switch to the same level at different levels and at different levels. However, in this case, the voltage level of the VO1 electrode can be implemented by lowering the voltage level from VA to VB. Hereinafter, the voltage level of the VO1 electrode will be described in detail with reference to FIG. 10.

First, when the initial state is the same voltage level of the VO1 electrode and the VE1 electrode is VA, the switch (SW3) to change the voltage level of both electrodes (VO1 electrode, VE1) to perform the power recovery operation by CLC series resonance ), The switch SW8 is turned on. Then, as shown in FIG. 10A, a voltage difference is generated between the VO1 electrode and the power supply VC, and a current path is formed through the inductor L, the diode D6, and the switch SW8 to the power supply VC to form LC resonance. This happens. At this time, the voltage level of the VO1 electrode becomes VB so that the two electrodes VO1 and VE1 become different voltage levels.

Subsequently, the power recovery operation is performed between the VO1 electrode and the VO2 electrode through LC resonance in the same manner as the operation shown in Modes 2 to 6 of FIGS.

When the voltage level of the VO1 electrode is VA and the voltage level of the VE1 electrode is VB, the switch SW8 is turned on while the switch SW4 is turned on in order to set the voltage level to VB of the two electrodes VO1 and VO2. do. At this time, a voltage difference is generated between the V01 electrode and the power supply VC, and a current path is formed through the inductor L, the diode D6, and the switch SW8 to the power supply VC to generate LC resonance. At this time, the voltage level of the VO1 electrode becomes VB so that the two electrodes VO1 and VE1 become the same voltage level VB.

As such, in order to satisfy the voltage level of the two electrodes VO1 and VE1 which are inevitable initial conditions in the series CLC resonant power recovery circuit, the VO1 electrode and the VO2 electrode are operated through the power recovery operation using the VC connector 324b. The power consumption can be further reduced by setting the voltage levels to each other. In addition, the power consumption can be further reduced by using the VC connection part 324b to make the voltage levels of the two electrodes VO1 and VE1 at the same voltage level.

In general, when the voltage levels of the two electrodes VO1 and VE1 which are initial conditions are the same, they are generated during the transition from the address period to the sustain discharge period, and when the voltage levels of the two electrodes VO1 and VE1 are different, the sustain discharge period. The two electrodes VO1 and VE1 are at different voltage levels in the course of the transition to the reset period after the last sustain discharge pulse at. At this time, the VC connection unit 324b according to the embodiment of the present invention operates to convert the same voltage level from the same voltage level and different voltage levels from the same voltage level through the power recovery operation by LC resonance.

In the power recovery circuit according to the embodiment of the present invention, a circuit such as the VC connection unit 324b may be applied not only in a series CLC resonance type but also in a parallel LC resonance type and a series LCLC resonance type. That is, when the capacitive load of the plasma display panel is used in the power recovery circuit as it is, power consumption may be reduced by using the power recovery circuit as described above.

In the above description, for convenience of description, it is assumed that the VO1 electrode is connected to the scan electrodes of odd lines among the scan electrodes Y1-Yn, and the VE1 electrode is connected to the scan electrodes of even lines, but the VO1 electrodes are scan electrodes Y1-Yn. Of course, the VE1 electrode may be connected to the other electrode and the remaining electrode.

In addition, the switches SW1 to SW6 may be implemented as MOSFETs and may be used without any switching elements.

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 the power recovery circuit which performs the power recovery operation using the capacitive load of the panel as it is, the voltages of the two electrodes VO1 and VE1 at different voltage levels and different voltage levels at the same voltage level. In the case of converting to the same voltage level, the power consumption can be further reduced by using the power recovery operation.

1 is a partial perspective view of a typical plasma display panel.

2 shows an electrode arrangement diagram of a typical plasma display panel.

3 is a diagram illustrating a connection relationship between a power recovery circuit of a scan electrode and a sustain electrode when a conventional parallel LC resonance type is applied.

4 is a diagram illustrating a connection relationship between a power recovery circuit of a scan electrode and a sustain electrode when a conventional series CLC resonance type is applied.

5 is a diagram briefly showing a power recovery circuit of a series CLC resonance type in a conventional system.

6 illustrates a plasma display panel according to an exemplary embodiment of the present invention.

7 is a view showing a power recovery circuit according to an embodiment of the present invention.

8 is a driving timing diagram of a power recovery circuit according to an embodiment of the present invention.

9A to 9H are diagrams showing current paths of respective modes in the current recovery circuit according to the embodiment of the present invention.

10A and 10B are diagrams illustrating current paths when a diode D6 and a switch SW8 operate in a current recovery circuit according to an exemplary embodiment of the present invention.

Claims (19)

A plurality of first and second electrodes, and first and second panel capacitors formed on the first and second electrodes, respectively, wherein the first electrode and the first and second panel capacitors are directly used. In the driving device of the plasma display panel to form a charge and discharge path between the second electrode, An inductor having a first end electrically connected to the first electrode; A first switch electrically connected between the second end of the inductor and the second electrode to switch a path for charging from the first electrode to the second electrode; A second switch electrically connected between the second end of the inductor and the second electrode to switch a path for charging from the second electrode to the first electrode; And a third switch electrically connected between a second end of the inductor and a first power supply for supplying a first voltage to switch a path for charging from the first power supply to the first electrode. . The method of claim 1, And a fourth switch electrically connected in parallel with the third switch between the second end of the inductor and the first power source to switch a path for discharging the first electrode. The method according to claim 1 or 2, The voltage of the first electrode and the second electrode is varied between a second voltage greater than the first voltage and a third voltage less than the first voltage by the operation of the first switch and the second switch. And the voltage of the first electrode is increased to the second voltage by the first power supply by turning on a third switch. The method of claim 2, The voltage of the first electrode and the second electrode is varied between a second voltage greater than the first voltage and a third voltage less than the first voltage by the operation of the first switch and the second switch. The voltage of the first electrode is lowered to the third voltage by the first power supply by the turn-on of the fourth switch. The method of claim 1, When the voltage of the first electrode and the voltage of the second electrode is the same by the turn-on of the third switch, the driving device of the plasma display panel, characterized in that the conversion to different voltage levels. The method of claim 1, And turning on the third switch to convert the voltage of the first electrode to the same voltage level when the voltage of the second electrode is different from each other.  The method of claim 2, And turning on the fourth switch, when the voltage of the first electrode and the voltage of the second electrode are the same, are converted to different voltage levels. The method of claim 2, And turning on the fourth switch to convert the voltage of the first electrode and the voltage of the second electrode to the same voltage level. The method of claim 1, A first diode in which a cathode is electrically connected to the second end of the inductor and an anode is electrically connected to the third switch, or a cathode is electrically connected to the third switch, and an anode is electrically connected to the first power source. The driving apparatus of the plasma display panel further comprising. The method of claim 9, A second diode in which an anode is electrically connected to a second end of the inductor and a cathode is electrically connected to the fourth switch, or an anode is electrically connected to the fourth switch, and a cathode is electrically connected to the first power source. The driving apparatus of the plasma display panel further comprising. The method of claim 1, And the third switch is turned on between an address period and a sustain period or between a sustain period and a reset period. The method of claim 2, And the fourth switch is turned on between an address period and a sustain period or between a sustain period and a reset period. The method according to claim 1 or 2, And the first electrode and the second electrode are scan electrodes. A plurality of first and second electrodes, first and second panel capacitors formed on the first and second electrodes, respectively, and an inductor having a first end electrically connected to the first end of the first electrode. The method of driving a plasma display panel, wherein a charge and discharge path is formed between the first electrode and the second electrode by directly using the first and second panel capacitors. (a) raising the first electrode to a first voltage by turning on a first switch electrically connected to the second end of the inductor; (b) turning on a second switch electrically connected between the second end of the inductor and the second electrode to lower the first electrode to a second voltage lower than the first voltage and the second electrode to Raising to a first voltage; (c) turning on a third switch electrically connected between the second end of the inductor and the second electrode to lower the second electrode to the second voltage and raise the first electrode to the first voltage; And driving the plasma display panel.  The method of claim 14, And lowering the first electrode to the second voltage by turning on a fourth switch electrically connected to the second end of the inductor. The method of claim 14, And the first switch is turned on between an address period and a sustain period or between a sustain period and a reset period. The method of claim 15, And the fourth switch is turned on between an address period and a sustain period or between a sustain period and a reset period. The method of claim 15, And the first switch and the fourth switch are electrically connected between a second end of the first inductor and a first power supply lower than the first voltage and greater than the second voltage, respectively. A plasma display device comprising the drive device as claimed in claim 1.