KR100482346B1 - Plasma Display Panel and Driving Method thereof - Google Patents

Abstract

The present invention relates to a plasma display panel capable of minimizing power consumption and stabilizing a driving waveform.

The energy recovery circuit of the plasma display panel of the present invention comprises a 1/2 sustain voltage source having a voltage of half of the sustain voltage, a back voltage circuit for generating a sustain voltage using the voltage of the 1/2 sustain voltage source, and a plasma display panel. And an inductor for forming a resonant circuit and a panel capacitor equivalently formed in the discharge cell, wherein the back voltage circuit includes a charging capacitor for charging a voltage of a 1/2 sustain voltage source.

Description

Plasma Display Panel and Driving Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a driving method thereof, and more particularly, to a plasma display panel and a driving method thereof capable of minimizing power consumption and stabilizing a driving waveform.

Plasma Display Panel (hereinafter referred to as "PDP") is an image display device using gas discharge, which is advantageous for a large screen, and image quality is improved by recent circuit technology and panel structure improvement.

PDP is largely divided into an alternating current type that causes the discharge by using the wall charge accumulated in the dielectric and the direct current type that causes the discharge between the electrodes facing in the longitudinal direction.

The AC PDP utilizes surface discharge occurring on the surface of the dielectric by applying an electrode to the dielectric. The driving pulse for sustaining and discharging the cells of this PDP has a frequency of several hundreds [KHZ] and a voltage of several hundreds [V].

In the case where charging and discharging occur by applying this driving pulse to the PDP, the capacitive load of the panel alone does not consume energy. However, since the driving pulse is generated using a DC power source, a large amount of energy loss occurs in the PDP. In particular, if an excessive current flows in the cell during discharge, the energy loss is greater. In order to recover unnecessary energy generated in the panel, that is, reactive power, the PDP includes an energy recovery circuit.

1 is a diagram illustrating an energy recovery circuit included in a conventional plasma display panel.

Referring to FIG. 1, the energy recovery circuit of the conventional PDP includes the eleventh and thirteenth switches S11 and S13 connected in parallel between the inductor L and the external capacitor Cs, the panel capacitor Cp, and the sustain voltage ( 12th switch S12 connected between Vs), 14th switch S14 connected between panel capacitor Cp and ground voltage source GND, panel capacitor Cp, and diodes D11 and D12. Inductor (L) is connected between.

Each of the eleventh and thirteenth switches S11 and S13 is provided with eleventh and twelfth diodes D11 and D12 to prevent reverse current.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The eleventh switch S11 is turned on when the voltage charged in the source capacitor Cs is supplied to the panel capacitor Cp. The thirteenth switch S13 is turned on when the voltage charged in the panel capacitor Cp is supplied to the source capacitor Cs. The twelfth switch S12 is turned on when the sustain voltage Vs is supplied to the panel capacitor Cp. The fourteenth switch S14 is turned on when the ground voltage source GND is supplied to the panel capacitor Cp. The inductor L forms a resonance circuit with the panel capacitor Cp.

An operation process of such an energy recovery circuit will be described in detail with reference to FIG. 2. In FIG. 2, Vcp denotes a charge / discharge voltage of the panel capacitor Cp, and Icp denotes a charge / discharge current of the panel capacitor Cp. Here, the operation process will be described on the assumption that the source capacitor Cs is charged with a voltage of Vs / 2.

First, at the time t1, the eleventh switch S11 is turned on. When the eleventh switch S11 is turned on, the voltage stored in the source capacitor Cs is supplied to the panel capacitor Cp via the eleventh switch S11, the eleventh diode D11, and the inductor L. At this time, the inductor L and the panel capacitor Cp form an LC resonant circuit. Therefore, the panel capacitor Cp is charged with the voltage of Vs which is twice the voltage of Vs / 2 by the resonance waveform of the LC resonant circuit.

At the time t2, the twelfth switch S12 is turned on. When the twelfth switch S12 is turned on, the voltage of the sustain voltage source VS is supplied to the panel capacitor Cp via the twelfth switch S12 via the switch. At this time, since the voltage of Vs is charged in the panel capacitor Cp at the time t1, the voltage value supplied from the sustain voltage source Vs may be minimized. On the other hand, the panel capacitor Cp maintains the sustain voltage Vs value from the time point t2 to the time point t3.

At a time t3, the thirteenth switch S13 is turned on. When the thirteenth switch S13 is turned on, the voltage charged in the panel capacitor Cp is supplied to the source capacitor Cs via the inductor L, the twelfth diode D12, and the thirteenth switch S13. . That is, the voltage charged in the panel capacitor Cp from the time t3 to the time t4 is supplied to the source capacitor Cs.

At time t4, the fourteenth switch S14 is turned on. When the fourteenth switch S14 is turned on, the ground voltage GND is supplied to the panel capacitor Cp. In practice, the sustain voltage, that is, the sustain pulse is supplied to the panel capacitor Cp while repeating the time points t1 to t4.

However, such a conventional energy recovery circuit has a disadvantage that a high voltage of several hundreds [V] or more is required to supply a sustain voltage to the panel. In order to overcome this disadvantage, the energy recovery circuit of FIG. 3 has been proposed.

Referring to FIG. 3, an energy recovery circuit according to another exemplary embodiment may include a twenty-first switch S21 and a twenty-second switch S22 connected between a 1/2 sustain voltage source Vs / 2 and an inductor L. A source capacitor Cs connected between the twenty-second switch S22 and the base voltage source GND, a twenty-third switch S23 connected between the inductor L and the base voltage source GND, and an inductor L; It has a panel capacitor Cp connected to it.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The inductor L forms a resonance circuit with the panel capacitor Cp.

An operation process of the energy recovery circuit according to another conventional embodiment as described above will be described in detail with reference to FIG. 4.

Referring to FIG. 4, first, the twenty-first switch S21 and the twenty-third switch S23 are turned on during the T1 period. When the twenty-first switch S21 is turned on, the voltage value of the 1/2 sustain voltage source Vs / 2 is charged to the source capacitor Cs. When the twenty-third switch S23 is turned on, the panel capacitor Cp is supplied with the ground voltage GND (that is, the ground potential is maintained).

The twenty-second switch S22 is turned on for the period T2. When the twenty-second switch S22 is turned on, the source capacitor Cs is electrically connected to the panel capacitor Cp via the twenty-second switch S22 and the inductor L. Therefore, the voltage Vs / 2 charged in the source capacitor Cs is supplied to the panel capacitor Cp. At this time, the inductor L and the panel capacitor Cp form an LC resonant circuit. Therefore, the panel capacitor Cp is charged with the voltage of Vs which is twice the voltage of Vs / 2 by the resonance waveform of the LC resonant circuit. In fact, the energy recovery circuit according to another embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse to the panel capacitor Cp while repeating the processes of T1 to T2.

In particular, the energy recovery circuit according to another conventional embodiment has an advantage that it can be driven using a voltage source 1/2 lower than the conventional energy recovery circuit shown in FIG. In addition, since only three switch elements are included, the manufacturing cost can be lowered.

However, since the energy recovery circuit according to another conventional embodiment supplies a voltage to the panel capacitor Cp using only the voltage charged in the source capacitor Cs, a constant voltage (that is, Vs) is applied to the panel capacitor Cp. It is difficult to maintain the voltage. (In fact, if the voltage of Vs is not maintained for a certain time, stable sustain discharge cannot be caused.) In addition, since the resonance waveform frequency of the resonant circuit changes due to the load variation of the panel, it is stable. It is difficult to supply a voltage of Vs to the panel capacitor Cp.

Accordingly, an object of the present invention is to provide a plasma display panel and a driving method thereof which minimize power consumption and stabilize driving waveforms.

In order to achieve the above object, the energy recovery circuit of the plasma display panel of the present invention is a half sustain voltage source having a voltage half of the sustain voltage and a back voltage for generating a sustain voltage using the voltage of the half sustain voltage source. A circuit, an inductor for forming a resonant circuit and a panel capacitor equivalently formed in a discharge cell of the plasma display panel, and the back voltage circuit includes a charging capacitor for charging a voltage of a 1/2 sustain voltage source.

The back voltage circuit includes a diode connected between the charging capacitor and the half sustain voltage source to supply the voltage of the half sustain voltage source to the charging capacitor, and a switch provided between the diode and the charging capacitor.

After the charging capacitor is charged with the voltage of the 1/2 sustain voltage source, the switch is turned on to supply the voltage of the 1/2 sustain voltage source to the negative terminal of the charging capacitor to generate a sustain voltage.

When the voltage of the 1/2 sustain voltage source is supplied to the panel capacitor, a sustain voltage is supplied to the panel capacitor by resonance of the inductor and the panel capacitor, and the sustain voltage is supplied from the back voltage circuit for a predetermined period after the sustain voltage is supplied to the panel capacitor. do.

A diode is further provided to the sustain voltage source to prevent reverse current.

And a charging switch installed between the charging capacitor and the base voltage source and turned on when the charging capacitor is charged.

A first diode disposed between the switch and the inductor to prevent reverse current, a first switch connected between the inductor and the 1/2 sustain voltage source, and connected between the first switch and the inductor to prevent reverse current And a second switch and a third switch connected in parallel between the inductor and the panel capacitor, wherein the second switch is turned on when a sustain voltage is supplied from the back voltage circuit to the panel capacitor, and the third switch. Is connected to the ground voltage source and is turned on when the panel capacitor supplies the ground potential.

When the third switch is turned on, a charge capacitor is charged with voltage.

An external capacitor is charged to recover the voltage charged in the panel capacitor.

The external capacitor charges the 1/2 sustain voltage, and when the voltage charged in the external capacitor is supplied to the panel capacitor, the sustain voltage is supplied to the panel capacitor by resonance of the inductor and the panel capacitor.

After the sustain voltage is charged to the panel capacitor, the sustain voltage is supplied from the back voltage circuit for a predetermined time.

And a charging switch installed between the charging capacitor and the base voltage source and turned on when the charging capacitor is charged.

First and second switches provided between the external capacitor and the inductor, first and second diodes installed on each of the first and second switches to prevent reverse current, and connected in parallel between the inductor and the panel capacitor. And a third switch and a fourth switch, wherein the third switch is turned on when a sustain voltage is supplied from the back voltage circuit to the panel capacitor.

The back voltage circuit is electrically connected to the first diode and is connected to the base potential when the fourth switch is turned on to charge the charging capacitor.

And a fifth switch installed between the back voltage circuit and the base voltage source and turned on when the charging capacitor is charged.

The fourth switch is electrically connected to the fifth switch, and the panel capacitor is connected to the ground voltage source when the fourth switch and the fifth switch are turned on at the same time.

The energy recovery circuit of the plasma display panel of the present invention includes a half sustain voltage source having a voltage half of the sustain voltage, a back voltage circuit for generating a sustain voltage using the voltage of the half sustain voltage source, and a charge of the panel capacitor. A first inductor positioned in the path and a second inductor positioned in the discharge path of the panel capacitor when the inductance different from the inductance of the first inductor are provided.

The back voltage circuit includes a charging capacitor for charging a voltage of a 1/2 sustain voltage source, a diode connected between the charging capacitor and the 1/2 sustain voltage source to supply a voltage of the 1/2 sustain voltage source to the charging capacitor; And a switch installed between the diode and the charging capacitor.

After the charging capacitor is charged with the voltage of the 1/2 sustain voltage source, the switch is turned on to supply the voltage of the 1/2 sustain voltage source to the negative terminal of the charging capacitor to generate a sustain voltage.

A first diode disposed between the first inductor and the back pressure circuit to prevent reverse current, a first switch installed between the panel capacitor and the back voltage circuit and turned on when a sustain voltage is supplied from the back voltage circuit; A second diode disposed between the inductor and the back pressure circuit to prevent reverse current, a second switch installed between the second diode and the back voltage circuit and turned on when the voltage is discharged from the panel capacitor, the panel capacitor, A third switch is installed between the base voltage sources to supply the base potential to the panel capacitor and to be turned on when the charging capacitor is charged.

The inductance of the second inductor is set greater than the inductance of the first inductor.

A method of driving a plasma display panel of the present invention includes generating a sustain voltage by backing a voltage of a 1/2 sustain voltage source having a voltage of half of the sustain voltage, and supplying the generated sustain voltage to the panel.

When the 1/2 sustain voltage source is supplied to the panel by the resonant circuit, the panel is supplied with the voltage of the sustain voltage source, the sustain voltage is supplied to the panel, and then the back-up sustain voltage is supplied to the panel for a predetermined time.

Other objects and features of the present invention in addition to the above object will become 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. 5 to 18.

5 is a view showing an energy recovery circuit according to a first embodiment of the present invention.

5, the energy recovery circuit according to the first embodiment of the present invention includes a 1/2 sustain voltage source (Vs / 2); A thirty-first switch S31 and a thirty-third switch S33 connected in parallel between the 1/2 sustain voltage source Vs / 2 and the inductor L; Thirty-first and thirty-second diodes D31 and D32 connected between the thirty-first switch S31 and the thirty-third switch S33; A thirty-second switch (S32) and a thirty-fourth switch (S34) connected in parallel between the inductor L and the panel capacitor Cp; And a thirty-third diode D33 connected between the thirty-second switch S32 and the thirty-first switch S31, and a charging capacitor Cs connected between the thirty-second node n32 and the thirty-third node n33. .

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The thirty-first diode D31, the thirty-second diode D32, and the thirty-third diode D33 prevent the reverse current from flowing. The thirty-first switch S31 is turned on when a voltage is charged in the panel capacitor Cp. The thirty-third switch S33 is turned on when the voltage charged in the panel capacitor Cp is discharged. The thirty-second switch S32 is turned on when the voltage charged in the charging capacitor Cs is supplied to the panel capacitor Cp. The S34 switch is turned on when the ground potential GND is supplied to the panel capacitor Cp. The inductor L forms a resonance circuit with the panel capacitor Cp. Here, the switches S31, S32, S33, and S34 are implemented with semiconductor switch elements such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery circuit according to the first embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7. In FIG. 6, Vcp represents the charge / discharge voltage of the panel capacitor Cp. FIG. 6 is a diagram illustrating a voltage value supplied to the panel capacitor Cp according to the switching operation, and FIG. 7 is a diagram illustrating a voltage value applied to the 32nd node n32.

6 and 7, the energy recovery circuit according to the first embodiment of the present invention uses the LC capacitor in the fourth period T4 for charging the charging capacitor Cs, using the LC resonant circuit. The driving is divided into a first period T1 for charging, a second period T2 for supplying the sustain voltage Vs to the panel capacitor Cp, and a third period T3 for discharging the voltage charged in the panel. .

First, in a fourth period T4, the thirty-fourth switch S34 is turned on. When the 34th switch S34 is turned on, the 1/2 sustain voltage source Vs / 2, the 33rd diode D33, the charging capacitor Cs, the 31st diode D31, the inductor L, and the 34th switch A current path leading to S34 and the ground potential GND is formed. At this time, the charging capacitor Cs is charged with the 1/2 sustain voltage Vs / 2. That is, when the thirty-fourth switch S34 is turned on, since the thirty-third node n32 is connected to the ground voltage source GND, the voltage Vs / 2 supplied to the thirty-third node n33 node has a voltage of the charging capacitor Cs. Is charged.

In the first period T1, the thirty first switch S31 is turned on. When the thirty-first switch S31 is turned on, the Vs / 2 voltage is supplied to the panel capacitor Cp via the thirty-first diode D31 and the inductor L. At this time, since the inductor L and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs. In addition, the half sustain voltage Vs / 2 is maintained in the thirty-second node n32 during the first period T1. That is, the sustain voltage Vs raised by the LC resonant circuit by the thirty-first diode D31 is not supplied to the thirty-second node n32, and thus, the thirty-second node n32 during the first period T1 is not provided. Maintain a 1/2 sustain voltage (Vs / 2). The half sustain voltage Vs / 2 supplied to the thirty-second node n32 is supplied to the negative of the charging capacitor Cs. Therefore, the charge capacitor Cs is combined with the half sustain voltage Vs / 2 charged therein and the half sustain voltage value supplied from the thirty-second node n32 to display the voltage of Vs. That is, the voltage value of the sustain voltage Vs appears at the 33rd node n33. On the other hand, the thirty-third diode D33 prevents the voltage applied to the thirty-third node n33 from being supplied to the thirty-second node n32.

In the second period T2, the thirty-second switch S32 is turned on. At this time, the thirty-first switch S31 maintains a turn-on state. When the thirty-second switch S32 is turned on, the sustain voltage Vs applied to the thirty-third node n33 is supplied to the panel capacitor Cp via the thirty-second switch S32. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2. In addition, since the thirty-first switch S32 is turned on, the thirty-second node n32 maintains a 1/2 sustain voltage Vs.

In the third period T3, the thirty-third switch S33 is turned on. At this time, the thirty-first switch S31 and the thirty-second switch S32 are turned off. When the thirty-third switch S33 is turned on, the voltage charged in the panel capacitor Cp is charged via the inductor L, the thirty-third diode D32, the thirty-third switch S33, and the thirty-third diode D33. It is supplied to the capacitor Cs. Therefore, the voltage charged in the panel capacitor Cp is discharged, and the charging capacitor Cs is charged by the voltage discharged in the panel capacitor Cp. In fact, the energy recovery circuit according to the first embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse, to the panel capacitor Cp while repeating the processes of T1 to T4.

The energy recovery circuit according to the first embodiment of the present invention can be driven using a voltage source 1/2 lower than that of the conventional energy recovery circuit shown in FIG. 1, thereby reducing power consumption. There is this. In addition, since the energy recovery circuit of the present invention can stably supply the sustain voltage Vs to the panel capacitor Cp, the energy recovery circuit can stably sustain sustain discharge as compared with the conventional energy recovery circuit shown in FIG. 3. have. In other words, the energy recovery circuit according to the first embodiment of the present invention has the advantage of reducing the power consumption and stably driving the panel.

8 is a view showing an energy recovery circuit according to a second embodiment of the present invention.

8, the energy recovery circuit according to the second embodiment of the present invention includes a 1/2 sustain voltage source (Vs / 2); A forty-first switch S41 and a forty-third switch S43 connected in parallel between the 1/2 sustain voltage source Vs / 2 and the inductor L; The 41st and 42nd diodes D41 and D42 connected between the forty-first switch S41 and the forty-third switch S43; A forty-second switch (S42) and a forty-fourth switch (S44) connected in parallel between the inductor (L) and the panel capacitor (Cp); A 43rd diode D43 connected between the forty-second switch S42 and a forty-first switch S41; and a charge capacitor Cs connected between the forty-second node n42 and the forty-third node n43. . In addition, the energy recovery circuit according to the second embodiment of the present invention is provided between the forty-first node (n41) and the half sustain voltage source (Vs / 2) which are common terminals of the forty-first switch (S41) and the forty-third switch (S43). And a forty-fourth diode D44 connected to it.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The forty-first diode D41, the forty-second diode D42, and the forty-third diode D43 prevent the reverse current from flowing. The forty-first switch S41 is turned on when a voltage is charged in the panel capacitor Cp. The 43rd switch S43 is turned on when the voltage charged in the panel capacitor Cp is discharged. The 42nd switch S42 is turned on when the voltage charged in the charging capacitor Cs is supplied to the panel capacitor Cp. The S44 switch is turned on when the ground potential GND is supplied to the panel capacitor Cp. The inductor L forms a resonance circuit with the panel capacitor Cp. Here, the switches S41, S42, S43, and S44 are implemented as semiconductor switch devices such as MOS FETs, IGBTs, and BJTs.

The 44 th diode D44 prevents the reverse current from being supplied to the 1/2 sustain voltage source Vs. Therefore, the energy recovery circuit according to the second embodiment of the present invention can be driven more stably. Since the operation of the energy recovery circuit in the second embodiment of the present invention is the same as the first embodiment of the present invention described above will be omitted.

9 is a view showing an energy recovery circuit according to a third embodiment of the present invention.

9, an energy recovery circuit according to a third embodiment of the present invention includes a 1/2 sustain voltage source (Vs / 2); A 51 st switch S51 and a 53 th switch S53 connected in parallel between the 1/2 sustain voltage source Vs / 2 and the inductor L; 51st and 52nd diodes D51 and D52 connected between the 51st switch S51 and the 53rd switch S53; A 52nd switch S52 and a 54th switch S54 connected in parallel between the inductor L and the panel capacitor Cp; A 53rd diode D53 connected between a 52nd switch S52 and a 51st switch S51, a charge capacitor Cs connected between a 52nd node n52, and a 53rd node n53, and a charge And a fifty-fifth switch S55 connected between the capacitor Cs and the ground voltage source GND.

Such an energy recovery circuit according to the third embodiment of the present invention further includes a fifty-fifth switch S55 as compared to the energy recovery circuit according to the first embodiment of the present invention shown in FIG. 5. The 55th switch S55 is turned on when the ground potential GND is provided to the charging capacitor Cs. In addition, in the energy recovery circuit according to the third embodiment of the present invention, a diode may be additionally installed at the 1/2 sustain voltage source (Vs / 2) as in the second embodiment of the present invention.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The fifty-first diode D51, the fifty-second diode D52, and the fifty-third diode D53 prevent a reverse current from flowing. The 51st switch S51 is turned on when a voltage is charged in the panel capacitor Cp. The 53rd switch S53 is turned on when the voltage charged in the panel capacitor Cp is discharged. The fifty-second switch S32 is turned on when the voltage charged in the charging capacitor Cs is supplied to the panel capacitor Cp. The 54th switch S54 is turned on when the ground potential GND is supplied to the panel capacitor Cp. The 55th switch S55 is turned on when a voltage is charged in the charging capacitor Cs. The inductor L forms a resonance circuit with the panel capacitor Cp. Here, the switches S51, S52, S53, S54, and S55 are implemented as semiconductor switch elements such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery circuit according to the third embodiment of the present invention will be described in detail with reference to FIG. 10. In FIG. 10, Vcp represents the charge / discharge voltage of the panel capacitor Cp.

Referring to FIG. 10, the energy recovery circuit according to the third embodiment of the present invention includes a fourth period T4 for charging the charging capacitor Cs, and a panel capacitor Cp charging using the LC resonant circuit. The driving is divided into one period T1, a second period T2 for supplying the sustain voltage Vs to the panel capacitor Cp, and a third period T3 for discharging the voltage charged in the panel.

First, in the fourth period T4, the 54th switch S54 and the 55th switch S55 are turned on. When the 55 th switch S55 is turned on, it passes through the 1/2 sustain voltage source Vs / 2, the 53 th diode D53, the charging capacitor Cs, and the 55 th switch S55 to the base voltage source GND. A current path to be connected is formed. Accordingly, the half sustain voltage Vs / 2 is charged in the charging capacitor Cs during the fourth period T4. On the other hand, when the 54th switch S54 is turned on for the fourth period T4, the ground potential GND is supplied to the panel capacitor Cp.

In the first period T1, the 51st switch S51 is turned on. When the 51st switch S51 is turned on, the Vs / 2 voltage is supplied to the panel capacitor Cp via the 51st switch S51, the 51st diode D51, and the inductor L. At this time, since the inductor L and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs. In addition, the half sustain voltage Vs / 2 is maintained in the 52nd node n52 during the first period T2. That is, the sustain voltage Vs raised by the LC resonant circuit by the 51st diode D31 is not supplied to the 52nd node n52. Thus, the 52nd node n52 during the first period T1 is not supplied. The 1/2 sustain voltage (Vs / 2) is maintained. The 1/2 sustain voltage Vs / 2 supplied to the 52nd node n52 is supplied to the negative of the charging capacitor Cs. Therefore, the charge capacitor Cs is combined with the half sustain voltage Vs / 2 charged therein and the half sustain voltage value supplied from the thirty-second node n32 to display the voltage of Vs. That is, the voltage value of the sustain voltage Vs appears at the 53rd node n53. Meanwhile, the 53rd diode D53 prevents the sustain voltage Vs applied to the 53rd node n53 from being supplied to the 52nd node n32.

The 52nd switch S52 is turned on in the 2nd period T2. At this time, the 51st switch S51 maintains a turn-on state. When the 52nd switch S52 is turned on, the sustain voltage Vs applied to the 53rd node n53 is supplied to the panel capacitor Cp via the 52nd switch S52. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2. Since the 51st switch S51 is turned on, the 52nd node n52 maintains the 1/2 sustain voltage Vs.

In the third period T3, the 53rd switch S53 is turned on. At this time, the 51st switch S51 and the 52nd switch S52 are turned off. When the 53 th switch S53 is turned on, the voltage charged in the panel capacitor Cp is charged via the inductor L, the 52 th diode D52, the 53 th switch S53, and the 53 th diode D33. It is supplied to the capacitor Cs. Therefore, the voltage charged in the panel capacitor Cp is discharged, and the charging capacitor Cs is charged by the voltage discharged in the panel capacitor Cp. In fact, the energy recovery circuit according to the third embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse, to the panel capacitor Cp while repeating the processes of T1 to T4.

11 is a view showing an energy recovery circuit according to a fourth embodiment of the present invention.

11, an energy recovery circuit according to a fourth embodiment of the present invention includes a 1/2 sustain voltage source (Vs / 2); A sixty-sixth diode D64 connected between the 1/2 sustain voltage source Vs / 2 and the 61st node n61; A sixty-third switch (S63), a sixty-second diode (D62), and a first inductor (L1) connected in series between a sixty-first node (n61) and a sixty-nine node (n64) connected to the panel capacitor (Cp); A sixty sixth switch S64 connected between the first inductor L1 and the ground voltage source GND; A sixty-one switch (S61), a sixteenth diode (D61), and a second inductor (L2) connected between the sixty-first node (n61) and the sixty-fourth node (n64); Charging connected between the 63rd diode D63 and the 62nd switch S62 connected between the 61st node n61 and the 64th node n64, and the 62nd node n62 and the 63rd node n63 Capacitor Cs is provided.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The switches S61, S62, S63, and S64 are implemented by semiconductor switch devices such as MOS FETs, IGBTs, and BJTs.

The 61 st diode D61 blocks the reverse current flowing from the panel capacitor Cp toward the 63rd node n63. The 62nd diode D62 blocks the reverse current flowing from the 61st node n61 toward the panel capacitor Cp. The 63rd diode D63 blocks the reverse current flowing from the 62nd node n62 toward the 61st node n61. The 64 th diode D64 blocks the reverse current flowing from the 61st node n61 toward the 1/2 sustain voltage source Vs / 2.

The first inductor L1 is positioned on the discharge path of the panel capacitor Cp. The inductance of the first inductor L1 is set large enough to increase the recovery efficiency of the voltage charged in the panel capacitor Cp. The second inductor L2 is positioned on the charging path of the panel capacitor Cp. The inductance of the second inductor L2 is larger than the inductance of the first inductor L1 so that the panel capacitor Cp can be charged in a short time, that is, the panel capacitor Cp having a fast rising time can be charged. It is set small.

The operation of the energy recovery circuit according to the fourth embodiment of the present invention will be described in detail with reference to FIG. 12. In FIG. 12, Vcp represents the charge / discharge voltage of the panel capacitor Cp.

Referring to FIG. 12, the energy recovery circuit according to the fourth embodiment of the present invention includes a fourth period T4 for maintaining the panel capacitor Cp at the base potential and charging the charging capacitor Cs, and an LC resonance circuit. A first period T1 for charging the panel capacitor Cp using a furnace, a second period T2 for supplying the sustain voltage Vs to the panel capacitor Cp, and a discharge for the voltage charged in the panel. The driving is divided into a third period T3.

First, the fourth switch S64 is turned on in the fourth period T4. When the 64th switch S64 is turned on, the 1/2 sustain voltage source Vs / 2, the 64th diode D64, the 63rd diode D63, the charging capacitor Cs, the 61st diode D61, A current path leading to the ground voltage source GND is formed via the second inductor L2 and the sixty-sixth switch S64. Therefore, the half sustain voltage Vs / 2 is charged in the charging capacitor Cp during the fourth period T4. During the fourth period T4, the panel capacitor Cp is connected to the base voltage source GND via the 64th switch S64.

In the first period T1, the sixty-first switch S61 is turned on. When the 61st switch S61 is turned on, the Vs / 2 voltage is passed through the panel capacitor Cp via the 64th diode D64, the 61st switch S61, the 61st diode D61, and the second inductor L2. Is supplied. At this time, since the second inductor L2 and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs. Here, since the second inductor L2 has a low inductance, the panel capacitor Cp is charged with the sustain voltage Vs in a short time.

Meanwhile, the half sustain voltage Vs / 2 is maintained in the 63rd node n63 during the first period T1. That is, the sustain voltage Vs raised by the LC resonant circuit by the 61st diode D61 is not supplied to the 63rd node n63. Thus, the 63rd node n63 during the first period T1 is not supplied. Maintain a 1/2 sustain voltage (Vs / 2). The 1/2 sustain voltage Vs / 2 supplied to the 63rd node n63 is supplied to the negative terminal of the charging capacitor Cs. Therefore, the charging capacitor Cs has a voltage value of Vs by adding up the 1/2 sustain voltage Vs / 2 charged to it and the 1/2 sustain voltage value supplied from the 63rd node n63. That is, the voltage value of the sustain voltage Vs appears at the 62nd node n62. Meanwhile, the 63rd diode D63 prevents the sustain voltage Vs applied to the 62nd node n62 from being supplied to the 61st node n61.

The 62nd switch S62 is turned on in the second period T2. At this time, the sixty-first switch S61 maintains a turn-on state. When the 62nd switch S62 is turned on, the sustain voltage Vs applied to the 62nd node n62 is supplied to the panel capacitor Cp via the 62nd switch S62. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2. In addition, since the sixty-first switch S61 is turned on, the sixty-third node n63 maintains a 1/2 sustain voltage Vs.

In the third period T3, the 63rd switch S63 is turned on. When the 63rd switch S63 is turned on, the voltage charged in the panel capacitor Cp passes through the first inductor L1, the 62nd diode D62, the 63rd switch S63, and the 63rd diode D63. Is supplied to the charging capacitor Cs. Therefore, the voltage charged in the panel capacitor Cp is discharged, and the charging capacitor Cs is charged by the voltage discharged in the panel capacitor Cp. In fact, the energy recovery circuit according to the fourth embodiment of the present invention supplies a sustain voltage Vs, that is, a sustain pulse to the panel capacitor Cp while repeating the processes of T1 to T4. On the other hand, since the inductance of the first inductor L1 is set large, it is possible to increase the voltage recovery rate (that is, the voltage charged in the charging capacitor Cs) of the voltage charged in the panel capacitor Cp.

13 is a view showing an energy recovery circuit according to a fifth embodiment of the present invention.

Referring to FIG. 13, the energy recovery circuit according to the fifth embodiment of the present invention includes the seventy-first switch S71 and the seventy-seventh switch S73 connected in parallel between the second charging capacitor Cs2 and the inductor L. FIG. Wow; A 71st diode (D71) and a 72nd diode (D72) connected between the seventy-first switch (S71) and the seventy-seventh switch (S73); A seventieth switch (S72) and a seventy-fourth switch (S74) connected in parallel between the inductor (L) and the panel capacitor (Cp); The first charge capacitor Cs1 connected between the 72nd node n72 and the 73rd node n73, and the 73rd diode D73 and the 75th switch S75 connected in parallel with the first charge capacitor Cs1. And a 1/2 sustain voltage source Vs / 2 connected to the common terminals of the 73rd diode D73 and the 75th switch S75.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The 71st diode D71, the 72nd diode D72, and the 73rd diode D73 prevent the reverse current from flowing. The seventy-first switch S71 is turned on when a voltage is charged in the panel capacitor Cp. The seventy-seventh switch S73 is turned on when the voltage charged in the panel capacitor Cp is recovered to the second charging capacitor Cs2. The 72nd switch S72 is turned on when the voltage charged in the first charging capacitor Cs1 is supplied to the panel capacitor Cp. The seventieth switch S74 is turned on when the ground potential GND is supplied to the panel capacitor Cp. Here, the switches S71, S72, S73, S74, and S75 are implemented by semiconductor switch elements such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery circuit according to the fifth embodiment of the present invention will be described in detail with reference to FIG. In FIG. 14, Vcp represents the charge / discharge voltage of the panel capacitor Cp.

Referring to FIG. 14, the energy recovery circuit according to the fifth embodiment of the present invention charges the panel capacitor Cp by using the LC resonant circuit during the fourth period T4 for charging the first charging capacitor Cs1. A first period T1 for supplying a second period, a second period T2 for supplying a sustain voltage Vs to the panel capacitor Cp, and a third period T3 for discharging the voltage charged in the panel capacitor Cp. Driven by dividing into. Here, an operation process of the energy recovery circuit will be described on the assumption that the second charging capacitor Cs2 is charged with the voltage Vs / 2.

First, the fourth switch S74 is turned on in the fourth period T4. When the 74th switch S74 is turned on, the 1/2 sustain voltage source Vs / 2, the 73rd diode D73, the first charging capacitor Cs1, the 71st diode D71, the inductor, and the 74th switch ( A current path leading to the ground potential GND is formed via S74. At this time, the first charging capacitor Cs1 is charged with the 1/2 sustain voltage Vs / 2. That is, when the 74 th switch S74 is turned on, the Vs / 2 voltage supplied to the 73 th node n73 is the first charge capacitor Cs1 because the 72 th node n72 is connected to the base voltage source GND. Is charged.

In the first period T1, the seventy-first switch S71 is turned on. When the 71 st switch S71 is turned on, the Vs / 2 voltage charged in the second charging capacitor Cs2 is passed through the 71 th switch S71, the 71 th diode D71, and the inductor L. Cp). At this time, since the inductor L and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs.

In the second period T2, the 72nd switch S72 and the 75th switch S75 are turned on. When the 75 th switch S75 is turned on, the 1/2 sustain voltage Vs / 2 is supplied to the negative terminal of the charging capacitor Cs. Therefore, the charging capacitor Cs has a voltage of Vs because the half sustain voltage (Vs / 2) charged to itself and the half sustain voltage (Vs / 2) supplied to its negative terminal are added together. Has a value. When the 72nd switch S72 is turned on, the voltage value of Vs applied to the 73rd node n73 is supplied to the panel capacitor Cp. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2.

In the third period T3, the 73rd switch S73 is turned on. When the 73rd switch S73 is turned on, the voltage charged in the panel capacitor Cp is transferred to the second charging capacitor Cs2 via the inductor L, the 72th diode D72, and the 73rd switch S73. Supplied. Accordingly, the voltage charged in the panel capacitor Cp is discharged, and the second charging capacitor Cs is charged by the voltage Vs / 2 by the voltage discharged in the panel capacitor Cp. In fact, the energy recovery circuit according to the fifth embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse to the panel capacitor Cp while repeating the processes of T1 to T4.

15 is a view showing an energy recovery circuit according to a sixth embodiment of the present invention.

Referring to FIG. 15, in the energy recovery circuit according to the sixth embodiment of the present invention, an eighty-eighth switch S81 and an eighty-eighth switch S83 connected in parallel with each other between the second charging capacitor Cs2 and the inductor L Wow; An 81st diode D81 and an 82nd diode D82 connected between the 81st switch S81 and the 83rd switch S83; An eighty-eighth switch S82 and an eighty-eighth switch S84 connected in parallel between the inductor L and the panel capacitor Cp; The first charge capacitor Cs1 connected between the 82nd node n82 and the 83rd node n83, and the 83rd diode D83 and the 86th switch S86 connected in parallel with the first charge capacitor Cs1. ), 1/2 sustain connected to the 85th switch S85 connected between the 86th switch S86 and the ground voltage source GND, and the common terminal of the 83rd diode D83 and the 86th switch S86. And a voltage source Vs / 2.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The 81st diode D81, the 82nd diode D82, and the 83rd diode D83 prevent the reverse current from flowing. The eighty-first switch S81 is turned on when a voltage is charged in the panel capacitor Cp. The 83rd switch S83 is turned on when the voltage charged in the panel capacitor Cp is recovered to the second charging capacitor Cs2. The eighty-second switch S82 is turned on when the voltage charged in the first charging capacitor Cs1 is supplied to the panel capacitor Cp. The 84th switch S84 is turned on when the ground potential GND is supplied to the panel capacitor Cp. The 85th switch S85 is turned on when the negative (−) terminal of the first charging capacitor Cs1 is connected to the ground potential GND. The 86th switch S86 is turned on when the voltage Vs / 2 is supplied to the negative terminal of the first charging capacitor Cs1. Here, the switches S81, S82, S83, S84, S85, and S86 are implemented by semiconductor switch elements such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery circuit according to the sixth embodiment of the present invention will be described in detail with reference to FIG. In FIG. 16, Vcp represents the charge / discharge voltage of the panel capacitor Cp.

Referring to FIG. 16, the energy recovery circuit according to the sixth embodiment of the present invention charges the panel capacitor Cp by using the LC resonant circuit during the fourth period T4 for charging the first charging capacitor Cs1. A first period T1 for supplying a second period, a second period T2 for supplying a sustain voltage Vs to the panel capacitor Cp, and a third period T3 for discharging the voltage charged in the panel capacitor Cp. Driven by dividing into. Here, an operation process of the energy recovery circuit will be described on the assumption that the second charging capacitor Cs2 is charged with the voltage Vs / 2.

First, in the fourth period T4, the 84th switch S84 and the 85th switch S85 are turned on. When the 85th switch 85 is turned on, the ground potential (GND) is passed through the 1/2 sustain voltage source (Vs / 2), the 83rd diode (D83), the first charging capacitor (Cs1), and the 85th switch (S85). A current path leading to) is formed. At this time, the first charging capacitor Cs1 is charged with the 1/2 sustain voltage Vs / 2. When the 84 th switch S84 is turned on, the panel capacitor Cp is connected to the ground potential GND.

In the first period T1, the 81st switch S81 is turned on. At this time, the 84th switch S84 is turned off and the 85th switch S85 maintains a turn-on state. When the 81st switch S81 is turned on, the Vs / 2 voltage charged in the second charging capacitor Cs2 is passed through the 81st switch S81, the 81st diode D81, and the inductor L. Cp). At this time, since the inductor L and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs. In addition, since the 85th switch S85 maintains the turn-on state, the first charging capacitor Cs1 maintains the 1/2 sustain voltage Vs / 2 charged thereto.

In the second period T2, the 82nd switch S82 and the 86th switch S86 are turned on. At this time, the 85 th switch S85 is turned off. When the 86 th switch S86 is turned on, the 1/2 sustain voltage Vs / 2 is supplied to the negative terminal of the charging capacitor Cs. Therefore, the charging capacitor Cs has a voltage of Vs because the half sustain voltage (Vs / 2) charged to itself and the half sustain voltage (Vs / 2) supplied to its negative terminal are added together. Has a value. When the 82nd switch S82 is turned on, the voltage value of Vs applied to the 83rd node n83 is supplied to the panel capacitor Cp. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2.

In the third period T3, the 83rd switch S83 and the 85th switch S85 are turned on. When the 83rd switch S83 is turned on, the voltage charged in the panel capacitor Cp is transferred to the second charging capacitor Cs2 via the inductor L, the 82nd diode D82, and the 83rd switch S83. Supplied. Accordingly, the voltage charged in the panel capacitor Cp is discharged, and the second charging capacitor Cs is charged by the voltage Vs / 2 by the voltage discharged in the panel capacitor Cp. When the 85 th switch S85 is turned on, the Vs / 2 voltage is charged in the first charging capacitor Cs1. In fact, the energy recovery circuit according to the sixth embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse to the panel capacitor Cp while repeating the processes of T1 to T4.

17 is a view showing an energy recovery circuit according to a seventh embodiment of the present invention.

Referring to FIG. 17, in an energy recovery circuit according to a seventh embodiment of the present invention, a 91 th switch S91 and a 93 th switch S93 connected in parallel between a second charging capacitor Cs2 and an inductor L, respectively. Wow; A 91st diode D91 and a 92nd diode D92 connected between the 91st switch S91 and the 93rd switch S93; A ninety-ninth switch S92 and a ninety-fourth switch S94 connected in parallel between the inductor L and the panel capacitor Cp; The first charging capacitor Cs1 connected between the 92nd node n92 and the 93rd node n93, and the 93rd diode D93 and the 96th switch S96 connected in parallel with the first charging capacitor Cs1. ), 1/2 sustain connected to the 95th switch S95 connected between the 96th switch S96 and the ground voltage source GND, and the common terminal of the 93rd diode D83 and the 96th switch S96 And a voltage source Vs / 2.

The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The 91 th diode D91, the 92 th diode D92, and the 93 th diode D93 prevent a reverse current from flowing. The ninety-ninth switch S91 is turned on when a voltage is charged in the panel capacitor Cp. The 93rd switch S93 is turned on when the voltage charged in the panel capacitor Cp is recovered to the second charging capacitor Cs2. The 92nd switch S92 is turned on when the voltage charged in the first charging capacitor Cs1 is supplied to the panel capacitor Cp. The ninetieth switch S94 is turned on when the ground potential GND is supplied to the panel capacitor Cp. The 95th switch S95 is turned on when the negative (−) terminal of the first charging capacitor Cs1 is connected to the ground potential GND. In addition, the 95 th switch S95 is turned on when the ground potential GND is supplied to the panel capacitor Cp. The 96th switch S96 is turned on when the voltage Vs / 2 is supplied to the negative terminal of the first charging capacitor Cs1. The switches S91, S92, S93, S94, S95, and S96 may be implemented as semiconductor switch devices such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery circuit according to the seventh embodiment of the present invention will be described in detail with reference to FIG. 18. In FIG. 18, Vcp represents the charge / discharge voltage of the panel capacitor Cp.

Referring to FIG. 18, the energy recovery circuit according to the seventh embodiment of the present invention charges the panel capacitor Cp using the LC resonant circuit during the fourth period T4 for charging the first charging capacitor Cs1. A first period T1 for supplying a second period, a second period T2 for supplying a sustain voltage Vs to the panel capacitor Cp, and a third period T3 for discharging the voltage charged in the panel capacitor Cp. Driven by dividing into. Here, an operation process of the energy recovery circuit will be described on the assumption that the second charging capacitor Cs2 is charged with the voltage Vs / 2.

First, in the fourth period T4, the 94th switch S94 and the 95th switch S95 are turned on. When the 95th switch 95 is turned on, the ground potential GND is passed through the 1/2 sustain voltage source Vs / 2, the 93rd diode D93, the first charging capacitor Cs1, and the 95th switch S95. A current path leading to) is formed. At this time, the first charging capacitor Cs1 is charged with the 1/2 sustain voltage Vs / 2. When the 94 th switch S94 is turned on, a current path leading to the ground potential GND is formed via the panel capacitor Cp, the 94 th switch S94, and the 95 th switch S95. Therefore, the panel capacitor Cp is connected to the ground potential GND.

In the first period T1, the 91st switch S91 is turned on. At this time, the 94 th switch S94 is turned off and the 95 th switch S95 maintains a turn on state. When the 91 th switch S91 is turned on, the Vs / 2 voltage charged in the second charging capacitor Cs2 is passed through the 91 th switch S91, the 91 th diode D91, and the inductor L. Cp). At this time, since the inductor L and the panel capacitor Cp form a resonance circuit, the panel capacitor Cp is charged with the sustain voltage Vs. In addition, since the 95th switch S95 maintains the turn-on state, the first charging capacitor Cs1 maintains the 1/2 sustain voltage Vs / 2 charged thereto.

In the second period T2, the 92nd switch S92 and the 96th switch S96 are turned on. At this time, the 95 th switch S95 is turned off. When the 96 th switch S96 is turned on, the 1/2 sustain voltage Vs / 2 is supplied to the negative terminal of the charging capacitor Cs. Therefore, the charging capacitor Cs has a voltage of Vs because the half sustain voltage (Vs / 2) charged to itself and the half sustain voltage (Vs / 2) supplied to its negative terminal are added together. Has a value. When the 92nd switch S82 is turned on, the voltage value of Vs applied to the 93rd node n93 is supplied to the panel capacitor Cp. Therefore, the panel capacitor Cp maintains the sustain voltage Vs during the second period T2.

In the third period T3, the 93rd switch S93 and the 95th switch S95 are turned on. When the 93rd switch S93 is turned on, the voltage charged in the panel capacitor Cp is transferred to the second charging capacitor Cs2 via the inductor L, the 92nd diode D82, and the 93rd switch S93. Supplied. Therefore, the voltage charged in the panel capacitor Cp is discharged, and the second charging capacitor Cs2 is charged by the voltage Vs / 2 by the voltage discharged in the panel capacitor Cp. When the 95th switch S95 is turned on, the voltage Vs / 2 is charged in the first charging capacitor Cs1. In fact, the energy recovery circuit according to the seventh embodiment of the present invention supplies a sustain voltage, that is, a sustain pulse to the panel capacitor Cp while repeating the processes of T1 to T4.

As described above, according to the plasma display panel and the driving method thereof according to the present invention, since the 1/2 sustain voltage source is used to supply the sustain voltage to the panel, power consumption can be reduced. In addition, since the sustain voltage is supplied to the discharge sustain period by adding the 1/2 sustain voltage charged to the charging capacitor and the 1/2 sustain voltage supplied from the 1/2 sustain voltage source, the sustain voltage can be stably supplied during the discharge sustain period. . Furthermore, since the half voltage of the switch elements can be lowered by about half of the conventional voltage because the 1/2 sustain voltage source is used, the cost can be reduced.

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. For example, although the energy recovery circuit according to the present invention has been described with a focus on the PDP, it is not limited to the PDP but may be applied to any flat panel display device or other electric / electronic circuit that requires high driving voltage and generates reactive power. Could be. 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 circuit diagram showing a conventional energy recovery circuit.

FIG. 2 is a timing diagram illustrating an operation process of the energy recovery circuit illustrated in FIG. 1.

3 is a circuit diagram showing an energy recovery circuit according to another conventional embodiment.

4 is a timing diagram illustrating an operation process of an energy recovery circuit illustrated in FIG. 3.

5 is a circuit diagram showing an energy recovery circuit according to a first embodiment of the present invention.

6 and 7 are timing diagrams and voltage waveform diagrams showing an operation process of the energy recovery circuit shown in FIG.

8 is a circuit diagram showing an energy recovery circuit according to a second embodiment of the present invention.

9 is a circuit diagram showing an energy recovery circuit according to a third embodiment of the present invention.

10 is a timing diagram illustrating an operation process of an energy recovery circuit illustrated in FIG. 9.

Fig. 11 is a circuit diagram showing an energy recovery circuit according to a fourth embodiment of the present invention.

12 is a timing diagram illustrating an operation process of an energy recovery circuit illustrated in FIG. 10.

Fig. 13 is a circuit diagram showing an energy recovery circuit according to a fifth embodiment of the present invention.

14 is a timing diagram showing an operation process of the energy recovery circuit shown in FIG.

15 is a circuit diagram showing an energy recovery circuit according to a sixth embodiment of the present invention.

16 is a timing diagram illustrating an operation process of an energy recovery circuit illustrated in FIG. 15.

17 is a circuit diagram showing an energy recovery circuit according to a seventh embodiment of the present invention.

18 is a timing diagram illustrating an operation process of an energy recovery circuit illustrated in FIG. 17.

Claims (23)

A plasma display panel provided with an energy recovery circuit for supplying sustain pulses having alternating sustain voltages respectively provided to the scan electrodes and sustain electrodes, The energy recovery circuit A 1/2 sustain voltage source having a voltage of half of the sustain voltage; A back voltage circuit for generating the sustain voltage using the voltage of the 1/2 sustain voltage source; And an inductor for forming a resonant circuit and a panel capacitor equivalently formed in the discharge cells of the plasma display panel. And said back voltage circuit comprises a charging capacitor for charging the voltage at said 1/2 sustain voltage source. The method of claim 1, The back voltage circuit is connected between the charging capacitor and the 1/2 sustain voltage source to supply a voltage of the 1/2 sustain voltage source to the charging capacitor; And a switch disposed between the diode and the charging capacitor. The method of claim 2, After the voltage of the 1/2 sustain voltage source is charged to the charging capacitor, the switch is turned on to supply the voltage of the 1/2 sustain voltage source to the negative terminal of the charging capacitor to generate the sustain voltage. Plasma display panel, characterized in that. The method of claim 1, When the voltage of the 1/2 sustain voltage source is supplied to the panel capacitor, the sustain voltage is supplied to the panel capacitor by resonance of the inductor and the panel capacitor. And the sustain voltage is supplied from the back voltage circuit for a predetermined period after the sustain voltage is supplied to the panel capacitor. The method of claim 1, And a diode disposed in the sustain voltage source to prevent reverse current. The method of claim 2, And a charging switch installed between the charging capacitor and the base voltage source and turned on when the charging capacitor is charged. The method of claim 2, A first diode disposed between the switch and the inductor to prevent reverse current; A first switch connected between the inductor and the 1/2 sustain voltage source; A second diode connected between the first switch and the inductor to prevent reverse current; A second switch and a third switch connected in parallel between the inductor and the panel capacitor, The second switch is turned on when the sustain voltage is supplied from the back voltage circuit to the panel capacitor, And said third switch is connected to a ground voltage source and is turned on when said panel capacitor supplies ground potential. The method of claim 7, wherein And a voltage is charged to the charging capacitor when the third switch is turned on. The method of claim 2, And an external capacitor which is charged by recovering the voltage charged in the panel capacitor. The method of claim 9, The external capacitor charges a half sustain voltage, and when the voltage charged in the external capacitor is supplied to the panel capacitor, a sustain voltage is supplied to the panel capacitor by resonance of the inductor and the panel capacitor. Plasma display panel. The method of claim 10, And after the sustain voltage is charged in the panel capacitor, the sustain voltage is supplied from the back voltage circuit for a predetermined period. The method of claim 11, And a charging switch installed between the charging capacitor and the base voltage source and turned on when the charging capacitor is charged. The method of claim 9, First and second switches disposed between the external capacitor and the inductor; First and second diodes installed on each of the first and second switches to prevent reverse current; A third switch and a fourth switch connected in parallel between the inductor and the panel capacitor, And the third switch is turned on when the sustain voltage is supplied from the back voltage circuit to the panel capacitor. The method of claim 13, And the back pressure circuit is electrically connected to the first diode, and is connected to a ground potential when the fourth switch is turned on to charge the charging capacitor with a voltage. The method of claim 13, And a fifth switch disposed between the back voltage circuit and a base voltage source, the fifth switch being turned on when the charging capacitor is charged. The method of claim 15, And the fourth switch is electrically connected to the fifth switch, and the panel capacitor is connected to the base voltage source when the fourth switch and the fifth switch are turned on at the same time. A plasma display panel provided with an energy recovery circuit for supplying sustain pulses having alternating sustain voltages respectively provided to the scan electrodes and sustain electrodes, The energy recovery circuit A 1/2 sustain voltage source having a voltage of half of the sustain voltage; A back voltage circuit for generating the sustain voltage using the voltage of the 1/2 sustain voltage source; A first inductor positioned in a charging path of the panel capacitor; And a second inductor positioned in a discharge path of the panel capacitor when the inductance is different from the inductance of the first inductor. The method of claim 17, The back voltage circuit may include a charging capacitor for charging a voltage of the 1/2 sustain voltage source; A diode connected between the charging capacitor and the 1/2 sustain voltage source to supply a voltage of the 1/2 sustain voltage source to the charging capacitor; And a switch disposed between the diode and the charging capacitor. The method of claim 18, After the voltage of the 1/2 sustain voltage source is charged to the charging capacitor, the switch is turned on to supply the voltage of the 1/2 sustain voltage source to the negative terminal of the charging capacitor to generate the sustain voltage. Plasma display panel, characterized in that. The method of claim 18, A first diode disposed between the first inductor and the back pressure circuit to prevent reverse current; A first switch disposed between the panel capacitor and the back voltage circuit and turned on when the sustain voltage is supplied from the back voltage circuit; A second diode disposed between the second inductor and the back pressure circuit to prevent reverse current; A second switch disposed between the second diode and the back pressure circuit and turned on when the voltage is discharged from the panel capacitor; And a third switch disposed between the panel capacitor and the base voltage source to supply a base potential to the panel capacitor and to be turned on when the charging capacitor is charged. The method of claim 17, And the inductance of the second inductor is set to be larger than the inductance of the first inductor. A driving method of a plasma display panel for supplying a sustain pulse having a sustain voltage alternately to a scan electrode and a sustain electrode, Generating a sustain voltage by boosting a voltage of a half sustain voltage source having a voltage of half of the sustain voltage; And supplying the generated sustain voltage to the panel. The method of claim 22, When the 1/2 sustain voltage source is supplied to the panel by a resonance circuit, the panel is supplied with the voltage of the sustain voltage source, And after the sustain voltage is supplied to the panel, the back-up sustain voltage is supplied to the panel for a predetermined period of time.