KR20050043361A - Energy recovery apparatus and method of plasma display panel - Google Patents

Abstract

The present invention relates to an energy recovery apparatus and a driving method of a plasma display panel to improve the driving efficiency of the plasma display panel and to simplify the configuration of the energy recovery apparatus.

An apparatus for recovering energy of a plasma display panel according to an embodiment of the present invention may include a plasma display panel, a power source for charging the panel, and a path formed between the power source and the panel to charge the panel with the power source. A transformer connected between the first switch elements and the first electrode and the second electrode of the panel to recover energy charged in the panel, and to charge the panel with a different polarity; and the transformer to charge and discharge the panel. And second switch elements for forming a path between the panels.

By such a configuration, the present invention can improve the driving efficiency of the panel by recovering the energy of the panel capacitor using a transformer, converting the recovered energy into another polarity and supplying it back to the panel capacitor. In addition, the present invention can reduce the number of high voltage, high current circuit elements used in the configuration of the energy recovery device can reduce the manufacturing cost and minimize the conduction loss caused by the circuit elements of the energy recovery device panel power consumption Can reduce the cost.

Description

Energy recovery apparatus and recovery method of plasma display panel {ENERGY RECOVERY APPARATUS AND METHOD OF PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy recovery apparatus and a recovery method of a plasma display panel. In particular, the present invention relates to an energy recovery apparatus and a recovery method of a plasma display panel to improve the driving efficiency of the plasma display panel and simplify the configuration of the energy recovery apparatus. It is about.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display panels (hereinafter referred to as "PDPs"), and electroluminescence ( Electro-Luminescence (EL) display.

PDP is a display device using a gas discharge has the advantage that it is easy to manufacture a large panel. As a PDP, a three-electrode AC surface discharge type PDP having three electrodes and driven by an alternating voltage is typical.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a first electrode 12Y and a second electrode 12Z formed on the upper substrate 10, and an address formed on the lower substrate 18. An electrode 20X is provided.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the first electrode 12Y and the second electrode 12Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the first electrode 12Y and the second electrode 12Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower plates and the partition wall.

The three-electrode AC surface discharge type PDP is driven by being divided into a plurality of subfields, and gray scale display is performed by emitting light a number of times proportional to the weight of video data in each subfield period. The subfield is driven again by being divided into an initialization period, an address period, a sustain period, and an erase period.

Here, the initialization period is a period during which uniform wall charges are formed in the discharge cells, the address period is a period during which selective address discharge occurs according to the logic value of the video data, and the sustain period is a discharge cell in which the address discharge has occurred. Is a period for maintaining the discharge. The erasing period is a period of erasing the sustain discharge generated in the sustain period.

The address discharge and the sustain discharge of the AC surface discharge PDP driven in this way require a high voltage of several hundred volts or more. Therefore, an energy recovery apparatus is used to minimize the driving power required for the address discharge and the sustain discharge. The energy recovery apparatus recovers the voltage between the first electrode 12Y and the second electrode 12Z and uses the voltage recovered as the drive voltage at the next discharge.

Referring to FIG. 2, the energy recovery devices 30 and 32 of the plasma display panel proposed by Weber (USP-5081400) are symmetrically installed with the panel capacitor Cp interposed therebetween. Here, the panel capacitor Cp equivalently represents the capacitance formed between the first electrode Y and the second electrode Z. FIG. The first energy recovery device 30 supplies a sustain pulse to the first electrode (Y). The second energy recovery device 32 supplies a sustain pulse to the second electrode Z while operating alternately with the first energy recovery device 30.

The configuration of the energy recovery devices 30 and 32 of the conventional plasma display panel will be described with reference to the first energy recovery device 30. The first energy recovery device 30 includes the inductor L connected between the panel capacitor Cp and the source capacitor Cs, and the first and the first connected in parallel between the source capacitor Cs and the inductor L. Three switches S1 and S3 and second and fourth switches S2 and S4 connected in parallel between the panel capacitor Cp and the inductor L are provided.

The second switch S2 is connected to the sustain voltage source VS, and the fourth switch S4 is connected to the ground voltage source GND. The source capacitor Cs recovers and charges the voltage charged to the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again. The source capacitor Cs is charged with a voltage of Vs / 2 corresponding to half of the sustain voltage source Vs. The inductor L forms a resonance circuit together with the panel capacitor Cp. The first to fourth switches S1 to S4 control the flow of current.

Meanwhile, the fifth and sixth diodes D5 and D6 respectively provided between the first and second switches S1 and S2 and the inductor L prevent the current from flowing in the reverse direction.

3 is a timing diagram and waveform diagrams illustrating on / off timing of the first energy recovery device switches and an output waveform of the panel capacitor.

The operation process will be described in detail assuming that the panel capacitor Cp is charged with a voltage of 0 volts and the source capacitor Cs is charged with a voltage of Vs / 2 before the T1 period.

In the T1 period, the first switch S1 is turned on to form a current path from the source capacitor Cs to the first switch S1, the inductor L, and the panel capacitor Cp. When the current path is formed, the voltage of Vs / 2 charged in the source capacitor Cs is supplied to the panel capacitor Cp. At this time, since the inductor L and the panel capacitor Cp form a series resonant circuit, the panel capacitor Cp is charged with a Vs voltage that is twice the voltage of the source capacitor Cs.

In the T2 period, the second switch S2 is turned on. When the second switch S2 is turned on, the voltage of the sustain voltage source Vs is supplied to the first electrode Y. The voltage of the sustain voltage source Vs supplied to the first electrode Y prevents the voltage of the panel capacitor Cp from falling below the sustain voltage source Vs so that sustain discharge occurs normally. On the other hand, since the voltage of the panel capacitor Cp has risen to Vs in the period T1, the driving power supplied from the outside to cause the sustain discharge is minimized.

In the T3 period, the first switch S1 is turned off. At this time, the first electrode Y maintains the voltage of the sustain voltage source Vs for the period of T3. In the T4 period, the second switch S2 is turned off and the third switch S3 is turned on. When the third switch S3 is turned on, a current path is formed from the panel capacitor Cp to the source capacitor Cs through the inductor L and the third switch S3 to charge the panel capacitor Cp. The voltage is recovered to the source capacitor Cs. At this time, the source capacitor Cs is charged with a voltage of Vs / 2.

In the T5 period, the third switch S3 is turned off and the fourth switch S4 is turned on. When the fourth switch S4 is turned on, a current path is formed between the panel capacitor Cp and the base voltage source GND, so that the voltage of the panel capacitor Cp drops to zero volts. In the T6 period, the state of T5 is maintained for a certain time. In fact, the AC drive pulses supplied to the first electrode Y and the second electrode Z are obtained by periodically repeating the periods T1 to T6.

Meanwhile, the second energy recovery device 32 alternately operates with the first energy recovery device 30 to supply a driving voltage to the panel capacitor Cp. Accordingly, the sustain capacitor voltage Vs having opposite polarities are supplied to the panel capacitor Cp. As such, sustain pulse voltages Vs having opposite polarities are supplied to the panel capacitor Cp so that sustain discharge occurs in the discharge cells.

However, these conventional energy recovery devices 30 and 32 are the first energy recovery device 30 provided on the first electrode (Y) side and the second energy recovery device (32) provided on the second electrode (Z) side. Each operation requires a large number of circuit components (switching elements, etc.), thereby increasing the manufacturing cost. In addition, the conduction loss of a plurality of switches (diode, switch element, inductor) on the path of current consumes a lot of power and reduces driving efficiency.

On the other hand, referring to Figure 4, the energy recovery device of the plasma display panel proposed by 'NEC (USP-5670974) is equivalent to the capacitance formed between the scan electrode and the sustain electrode of the plasma display panel (1) The panel capacitor 40 shown, the charge-discharge circuit part 2 and the voltage clamp part 3 connected in parallel with the panel capacitor Cp are provided. In particular, the charge / discharge circuit part 2 is connected to the panel capacitor 40 of the panel 1 in parallel and the coil 8 to recharge to the reverse polarity of the resonant current generated during the discharge of the panel capacitor 40, and 2 Two switches 12, 13. These two switches 12, 13 form a bidirectional switch with respect to the coil 8. That is, one side of the panel capacitor 40 has two switches 12 and 13 formed by the N-channel FET controlled by each of the other switch driving input signals IN5 and IN6 supplied to the gate terminal and each of the two switches 12 and 13. Reverse current blocking diodes 10, 11 connected in series to the switches 12, 13 are connected in series. On the other side of the panel capacitor 40, a coil 8 connected in parallel and one end of the resistor 9 are connected. At this time, the other ends of the coils 8 and the resistors 9 connected in parallel are commonly connected to the other ends of the diodes 10 and 11. The panel capacitor 40 and the charge / discharge circuit 2 of the panel 1 described above form a parallel resonance circuit. On the other hand, the resistor 9 connected in parallel to the coil 8 of the charge / discharge circuit part 2 is a dumping resistor provided in order to prevent vibration of a waveform.

The voltage clamp part 3 is composed of first to fourth switches 4, 5, 6, and 7, wherein the first and third switches 4 and 6 are connected to one end of the panel capacitor 40 and a power source. It is connected between the voltage sources GND and -VS, respectively, and the second and fourth switches 6 and 7 are connected between the other end of the panel capacitor 40 and the power supply voltage sources GND and -VS. The first and second switches 4, 5 are P-channel FETs, the third and fourth switches 6, 7 are N-channel FETs, the switches 4, 6 and the switches 5, 7. ) Are each formed in a CMOS circuit configuration.

The energy recovery apparatus of the plasma display panel forms a parallel resonant circuit using the panel capacitor 40 of the panel 1 and the coil 8 of the charge / discharge circuit unit 2, and the switches 4, 5, 6, 7) Repetitive charging and discharging of the panel capacitor 40 by each driving reduces the reactive power.

5 is a waveform diagram of a driving voltage and a driving current waveform of the panel shown in FIG. 4. Referring to FIG. 5, the waveforms IN1 to IN6 are input waveforms for driving the FET switches 12 and 13 and the switches 4, 5, 6, and 7 shown in FIG. 4. The waveform VCP is a voltage waveform at both ends of the panel capacitor 40, and the waveform IL is a current waveform flowing through the coil 8.

In detail, first, the operation process will be described in detail assuming that no charge is charged in the panel capacitor 40 of the panel 1 at t = 0 before the A 'period.

In the period A ', when the second switch 4 and the fourth switch 7 are turned on. As shown in FIG. 6A, a current path is formed from the base voltage source GND to the first switch 4, the panel capacitor 40, the fourth switch 7, and the reverse voltage source (-VS). When the current path is formed in this way, the panel capacitor 40 is charged with charge.

In the period B, when the switch 12 is turned on, one end of the panel capacitor 40, the other end of the coil 8, the diode 10, the switch 12, and the panel capacitor 40, as shown in FIG. 6B. A current path is formed that leads to. When the current path is formed, the discharge current from the panel capacitor 40 is supplied to the coil 8. At this time, since the counter electromotive force is generated in the coil 8 and the resonant current IL flows, when the current of the panel capacitor 40 reaches zero, the voltage VCP applied to the panel capacitor 40 is maximum. Becomes the reverse voltage (-VS).

In the C period, when the maximum reverse voltage (-VS) is applied to the panel capacitor 40, the second switch 5 and the third switch 6 are turned on so that the base voltage source ( GND), a second switch 5, a panel capacitor 40, a third switch 6 and a current path leading to the reverse voltage source (-VS) are formed. When the current path is formed in this way, one end of the third switch 6 of the panel capacitor 40 is clamped to the reverse voltage (-VS). At this time, the polarity of the panel capacitor 40 becomes reverse polarity in the period A '.

In the D period, the switch 13 is turned on after the second and third switches 5 and 6 are turned off. For this reason, in the period D, a current path is formed that leads to the other end of the panel capacitor 40, the switch 13, the coil 8, and one end of the panel capacitor 40, as shown in FIG. When the current path is formed, the electric charge stored in the panel capacitor 40 is discharged to the coil 8. That is, the reverse direction IL flows with the B period. On the other hand, when the voltage VCP of the panel capacitor 40 rises to zero, the maximum current flows in the coil 8. Thus, the panel capacitor 40 is recharged with reverse polarity voltage.

In period A, when the recharge of the reverse polarity voltage to the panel capacitor 40 is terminated by the counter electromotive force of the coil 8, the switch 13 is turned off, and as shown in FIG. 6E, the first and fourth switches 4 , 7) is turned on. Thus, the charge of the panel capacitor 40 is maintained until the next cycle. Then, the operation is repeatedly performed from A 'to D period.

In this way, the energy recovery device of the PDP reduces the charge / discharge power of the panel capacitor 40 by the resonant operation in which the timing of the panel capacitor 40, the coil 8, and each switch is controlled, and until the next cycle. Most of the reactive power of the previous cycle can be recovered as an enemy.

However, the energy recovery device of the PDP proposed in 'NEC (USP-5670974)' requires an energy recovery device and a sustain circuit at each of the scan electrode and the sustain electrode of the plasma display panel 1, which complicates the circuit configuration. Accordingly, there is a problem that the manufacturing cost is increased. In addition, the energy recovery device of the PDP proposed by 'NEC (USP-5670974)' has a smaller conduction loss than the energy recovery device proposed by 'Weber (USP-5081400)'. The conduction loss of the switches consumes a lot of power, which reduces the driving efficiency.

Accordingly, an object of the present invention is to provide an energy recovery apparatus and a recovery method of a plasma display panel that can improve the driving efficiency of the plasma display panel and simplify the configuration of the energy recovery apparatus.

In order to achieve the above object, an energy recovery apparatus of a plasma display panel according to an embodiment of the present invention is formed by forming a path between the plasma display panel, a power source for charging the panel, and the power source and the panel. First switch elements for charging with the power source, a transformer connected between the first electrode and the second electrode of the panel to recover energy charged in the panel to charge the panel with different polarity, and the panel And second switch elements for forming a path between the transformer and the panel so as to be charged and discharged.

In the drive device, the first switch elements include a first switch connected between the power supply and the first electrode, a second switch connected between the second electrode and a base voltage source, and between the power supply and the second electrode. And a fourth switch connected to the first switch, and a fifth switch connected between the first electrode and the base voltage source.

In the driving device, the transformer is a first winding connected between the second electrode and the second switch elements, and is wound in the same direction as the first winding and between the first electrode and the second switch elements. And a second winding connected.

The second switch elements in the drive device include a sixth switch connected between the first winding and the base voltage source, and a third switch connected between the second winding and the base voltage source.

In the driving device, the third switch and the sixth switch are alternately switched.

In the driving device, the transformer recovers energy charged in the panel by switching of the third switch, induces the first winding, and supplies the induced energy through the second electrode of the panel.

In the driving device, the transformer recovers energy charged in the panel by switching of the sixth switch to induce the second winding, and supplies the induced energy through the first electrode of the panel.

An energy recovery method of a plasma display panel according to an embodiment of the present invention, the energy recovery method of the plasma display panel, the first step of charging the panel with a voltage from a power source, the first electrode and the second electrode of the panel A second step of recovering energy charged in the panel by using a transformer connected between the second step of charging the panel with different polarity, and a third step of forming a path between the transformer and the panel to charge and discharge the panel Characterized in that it comprises a.

In the driving method, the third step is to switch a first switch connected between the second winding of the transformer and a ground voltage source to form a first current path between the panel and the ground voltage source via the second winding. And switching a second switch connected between the first winding of the transformer and a ground voltage source to form a second current path between the panel via the first winding and the ground voltage source. It is done.

In the driving method, the first and second switches are alternately switched.

In the driving method, the second step includes inducing the energy charged in the panel flowing in the second winding of the transformer by the first current path to the first winding of the transformer, and inducing the induced energy in the panel. It is characterized in that the supply through the second electrode.

In the driving method, the second step includes inducing energy charged in the panel flowing through the first winding of the transformer to the second winding of the transformer by the second current path, and transmitting the induced energy to the panel. It is characterized in that the supply through the first electrode.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 7 to 12.

Referring to FIG. 7, an energy recovery apparatus of a plasma display panel (hereinafter, referred to as a “PDP”) according to an exemplary embodiment of the present invention is a panel capacitor that is equivalently formed on the first and second electrodes of the PDP. (Cp), a sustain voltage source (Vs) for supplying a sustain voltage to the panel capacitor (Cp), and a connection between the first node (N1) and the sustain voltage source (Vs) connected to the first electrode of the panel capacitor (Cp). The first switch element Q1, the fifth switch element Q5 connected between the first node N1 and the ground voltage source GND, and the second node connected to the second electrode of the panel capacitor Cp. Fourth switch element Q4 connected between N2 and sustain voltage source Vs, second switch element Q2 connected between second node N2 and base voltage source GND, and first node; A transformer 100 connected between the N1 and the second node N2, and between the first winding L1 of the transformer 100 and the ground voltage source GND. And a sixth switch element Q6 connected to the third switch element Q3 connected between the second winding L2 of the transformer 100 and the ground voltage source GND.

Each of the first and fourth switch elements Q1 and Q4 serves to switch the sustain voltage from the sustain voltage source Vs to the panel capacitor Cp. Each of the second and fifth switch elements Q2 and Q5 serves to connect the panel capacitor Cp to the ground voltage source GND. Each of the third and sixth switch elements Q3 and Q6 serves to connect the first and second windings L1 and L2 of the transformer 100 to the ground voltage source GND. The first to sixth switch elements Q1 to Q6 control the flow of current while being turned on and off. Diodes are connected in parallel to each of the first to sixth switch elements Q1 to Q6. The diodes may be used as internal diodes of the first to sixth switch elements Q1 to Q6. Also, diodes can be used as external diodes. On the other hand, each of the first to sixth switch elements Q1 to Q6 is a semiconductor switch element, for example, any one of MOS FET, IGBT, SCR, and BJT.

The transformer 100 is composed of first and second windings L1 and L2 wound in the same direction. Organic energy is recovered from the panel capacitor Cp by alternating switching of the third and sixth switch elements Q3 and Q6 and flows through the first winding L1 to the second winding L2. Resupply to the panel capacitor Cp, or induce energy recovered from the panel capacitor Cp and flowing in the second winding L2 to the first winding L1, and resupply the induced energy to the panel capacitor Cp. do.

FIG. 8 is a timing diagram and waveform diagrams illustrating on / off timings of the switch elements illustrated in FIG. 7 and voltages applied to panel capacitors.

Referring to FIG. 8, an energy recovery apparatus and a recovery method of a plasma display panel according to an exemplary embodiment of the present invention will be described.

In the T1 section, since the first and second switch elements Q1 and Q2 are turned on, the sustain voltage source Vs, the first switch element Q1, the panel capacitor Cp, and the second switch, as shown in FIG. A current path is formed that leads to element Q2 and ground voltage source GND. Accordingly, the panel capacitor Cp maintains the positive sustain voltage supplied from the sustain voltage source Vs through the current path.

Then, in the period T2, the first and second switch elements Q1 and Q2 are turned off and the third switch element Q3 is turned on, so that the first electrode and the first electrode of the panel capacitor as shown in FIG. A current path is formed that leads to one node N1, the second winding L2 of the transformer 100, the third switch element Q3, and the ground voltage source GND. Due to this current path, the current flowing in the second winding L2 is induced in the first winding L1 of the transformer 100 by the current path, and the induced current passes through the second node N2. It is applied to the second electrode of (Cp). That is, when the third switch element Q3 is turned on, since the first and second windings L1 and L2 of the transformer 100 are wound in the same direction, the second winding L2 may be connected to the first winding L1. The current flowing in the direction opposite to the direction of the current flowing in the current flows. As such, in the T2 section, the voltage charged in the panel capacitor Cp is recovered due to the turn-on of the third switch element Q3, and the current flowing through the second winding L2 of the transformer 100 is transmitted to the transformer 100. The induced current is induced in the first winding L1, and the induced current charges the panel capacitor Cp with different polarity. Therefore, in the T1 section, the voltage charged in the panel capacitor Cp is recovered, and the recovered energy is converted into a voltage having a reverse polarity to recharge the panel capacitor Cp.

Subsequently, in the period T3, the fourth and fifth switch elements Q4 and Q5 are turned on so that the sustain voltage source Vs, the fourth switch element Q4, the panel capacitor Cp, and the fifth switch element Q4 and Q5 are turned on. A current path is formed that leads to the five switch element Q5 and the ground voltage source GND. Accordingly, the panel capacitor Cp maintains the negative sustain voltage supplied from the sustain voltage source Vs through the current path.

Then, in the period T4, the fourth and fifth switch elements Q4 and Q5 are turned off and the sixth switch element Q6 is turned on so that the second portion of the panel capacitor Cp as shown in FIG. 12. A current path is formed that leads to the electrode, the second node N2, the first winding L1 of the transformer 100, the sixth switch element Q6, and the ground voltage source GND. Due to this current path, the current flowing in the first winding L1 is induced in the second winding L2 of the transformer 100 by the current path, and the induced current is passed through the first node N1 through the panel capacitor. It is applied to the first electrode of (Cp). That is, when the sixth switch element Q6 is turned on, since the first and second windings L1 and L2 of the transformer 100 are wound in the same direction, the second winding L2 is connected to the first winding L1. The current flowing in the direction opposite to the direction of the current flowing in the current flows. As such, in the T4 section, the voltage charged in the panel capacitor Cp is recovered due to the turn-on of the sixth switch element Q6, and the current flowing through the first winding L1 of the transformer 100 is transformed into the transformer 100. The induced winding of the second winding L2 of the induced current causes the panel capacitor Cp to be charged with different polarity. Therefore, in the period T4, the voltage charged in the panel capacitor Cp is recovered, and the recovered energy is converted into a voltage having a reverse polarity to recharge the panel capacitor Cp.

As such, the period T1 to T4 is periodically repeated, an AC sustain pulse is supplied to the panel capacitor Cp. In practice, the AC drive pulses supplied to the first electrode and the second electrode of the PDP are generated while the above-described T1 to T4 periods are periodically repeated.

As described above, the energy recovery apparatus and recovery method of the plasma display panel according to the embodiment of the present invention by recovering the energy of the panel capacitor using a transformer, by converting the recovered energy to a different polarity and re-supplied to the panel capacitor The driving efficiency of the panel can be improved. In addition, the present invention can reduce the number of high voltage, high current circuit elements used in the configuration of the energy recovery device can reduce the manufacturing cost and minimize the conduction loss caused by the circuit elements of the energy recovery device panel power consumption Can reduce the cost.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a perspective view showing a conventional three-electrode AC surface discharge type plasma display panel.

2 is a circuit diagram showing an energy recovery apparatus of a conventional plasma display panel.

FIG. 3 is a timing diagram and waveform diagram showing on / off timing of the switches shown in FIG. 2 and an output waveform of the panel capacitor. FIG.

4 is a circuit diagram showing an energy recovery apparatus of another conventional plasma display panel.

FIG. 5 is a timing diagram and waveform diagram showing on / off timing of the switches shown in FIG. 4 and an output waveform of the panel capacitor. FIG.

FIG. 6A is a circuit diagram showing an on / off state and a current path of a switch element in the period A ′ shown in FIG. 5; FIG.

FIG. 6B is a circuit diagram showing an on / off state and a current path of a switch element in period B shown in FIG. 5; FIG.

FIG. 6C is a circuit diagram showing an on / off state and a current path of a switch element in period C shown in FIG. 5; FIG.

FIG. 6D is a circuit diagram showing an on / off state and a current path of a switch element in period D shown in FIG. 5; FIG.

Fig. 6E is a circuit diagram showing on / off states of switch elements in period A shown in Fig. 5;

7 is a circuit diagram illustrating an energy recovery apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 8 is a timing diagram and waveform diagram showing on / off timing of the switch elements shown in FIG. 7 and an output waveform of the panel capacitor. FIG.

FIG. 9 is a circuit diagram illustrating a current path according to switching of switches in a T1 section shown in FIG. 8.

FIG. 10 is a circuit diagram illustrating a current path according to switching of switches in a T2 section shown in FIG. 8.

FIG. 11 is a circuit diagram illustrating a current path according to switching of switches in a T3 section shown in FIG. 8.

FIG. 12 is a circuit diagram illustrating a current path according to switching of switches in a period T4 illustrated in FIG. 8.

<Description of Symbols for Main Parts of Drawings>

1 plasma display panel 2 charging circuit

3: clamp part 4, 5, 6, 7: switch

8: inductor 9: resistance

12, 13: FET 10: upper substrate

12Y: first electrode 12Z: second electrode

14,22 dielectric layer 16: protective film

18: lower substrate 20X: address electrode

24: partition 26: phosphor layer

30, 32: energy recovery device 40: panel capacitor

100: transformer

Claims (12)

Plasma display panel, A power source for charging the panel; First switch elements for forming a path between the power source and the panel to charge the panel with the power source; A transformer connected between the first electrode and the second electrode of the panel to recover energy charged in the panel to charge the panel with different polarity; And second switch elements for forming a path between the transformer and the panel so that the panel is charged and discharged. The method of claim 1, The first switch elements, A first switch connected between the power supply and the first electrode, A second switch connected between said second electrode and a ground voltage source; A fourth switch connected between the power supply and the second electrode, And a fifth switch connected between the first electrode and the ground voltage source. The method of claim 1, The transformer, A first winding connected between the second electrode and the second switch elements, And a second winding wound in the same direction as the first winding and connected between the first electrode and the second switch elements. The method of claim 3, wherein The second switch elements, A sixth switch connected between said first winding and a ground voltage source, And a third switch connected between the second winding and the ground voltage source. The method of claim 4, wherein And the third switch and the sixth switch are alternately switched. The method of claim 5, wherein The transformer recovers energy charged in the panel by switching of the third switch, induces energy in the first winding, and supplies the induced energy through the second electrode of the panel. Recovery device. The method of claim 5, wherein The transformer recovers energy charged in the panel by switching the sixth switch, induces the second winding, and supplies the induced energy through the first electrode of the panel. Recovery device. In the energy recovery method of the plasma display panel, A first step of charging the panel with a voltage from a power source, A second step of recovering the energy charged in the panel by using a transformer connected between the first electrode and the second electrode of the panel to charge the panel with different polarity; And a third step of forming a path between the transformer and the panel such that the panel is charged and discharged. The method of claim 8, The third step, Switching a first switch connected between a second winding of the transformer and a base voltage source to form a first current path between the panel via the second winding and the base voltage source; Switching a second switch connected between a first winding of the transformer and a ground voltage source to form a second current path between the panel via the first winding and the ground voltage source; Energy recovery method of display panel. The method of claim 9, And the first and second switches are alternately switched. The method of claim 9, The second step, Inducing energy charged in the panel flowing in the second winding of the transformer by the first current path to the first winding of the transformer; The energy recovery method of the plasma display panel, characterized in that for supplying the induced energy through the second electrode of the panel. The method of claim 9, The second step, Inducing energy charged in the panel flowing in the first winding of the transformer by the second current path to the second winding of the transformer; The energy recovery method of the plasma display panel, characterized in that for supplying the induced energy through the first electrode of the panel.