KR100511792B1 - Energy recovery apparatus and method of plasma display panel - Google Patents

Abstract

The present invention relates to an energy recovery apparatus and a recovery method of a plasma display panel that can minimize the conduction loss of current by the switch element and simplify the circuit configuration.

The present invention provides a plasma display panel, a power supply for generating a sustain voltage, an inductor for charging energy from the power supply while the voltage of the panel is maintained by the power supply, and an energy charged in the inductor. And switching elements for blocking a path between the panel and the power supply so that a reverse voltage is induced in the inductor and the reverse voltage is supplied to the panel.

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 for a plasma display panel, and more particularly, to an energy recovery apparatus and a recovery method for a plasma display panel that can minimize a conduction loss of a current by a switch element and simplify a circuit configuration.

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 PDP 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 PDP 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, a large amount of power is consumed due to the conduction loss of a plurality of switches (diode, switch element, inductor) on the path of current.

On the other hand, referring to Figure 4, the energy recovery device of the PDP proposed by 'NEC (USP-5670974)' is a panel capacitor (equivalently showing the capacitance formed between the scan electrode and the sustain electrode of the PDP ( 40 and a charge / discharge circuit portion 2 and a voltage clamp portion 3 connected in parallel to the panel capacitor Cp. 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. The power supply voltage sources GND and -VS are respectively connected, and the second and fourth switches 6 and 7 are connected to 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 device of the PDP 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. Each driving is repeated to charge and discharge the panel capacitor 40 to reduce 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 in fewer parts.

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 PDP 1, which complicates the circuit configuration. Accordingly, there is a problem that the manufacturing cost is increased. In addition, the energy recovery device of PDP proposed by 'NEC (USP-5670974)' has a smaller conduction loss of the multiple switches on the path of current than the energy recovery device proposed by 'Weber (USP-5081400)'. Power consumption is high due to the conduction loss of devices.

Accordingly, it is an object of the present invention to provide an energy recovery apparatus and a recovery method of a PDP that can minimize the conduction loss of current by the switch element and simplify the circuit configuration.

In order to achieve the above object, the energy recovery device of the PDP according to the embodiment of the present invention is a PDP, a power supply for generating a sustain voltage, and the power supply from the power supply while the voltage of the PDP is maintained at the sustain voltage by the power supply; Inductors for charging the energy of the switching element and the switch elements for blocking the path between the PDP and the power in the state in which the inductor is charged to cause a reverse voltage is induced in the inductor and the reverse voltage is supplied to the PDP Equipped.

In the energy recovery device, the inductor stores the energy recovered from the PDP and supplies the reversed voltage to the PDP.

In the energy recovery apparatus, the power supply includes a first power supply for charging the PDP with a sustain voltage of a first polarity, and a second power supply for charging the PDP with a sustain voltage of a second polarity different from the first polarity. It is done.

In the energy recovery device, the switch elements include a first switch element connected between the first power source and the PDP, a second switch element connected between the second power source and the PDP, and between the inductor and the PDP. Third and fourth switch elements connected in parallel, a first diode connected between the third switch and the PDP to block reverse current from the PDP, and connected between the fourth switch and the PDP; And a second diode that blocks reverse current from the switch.

In the energy recovery device, the first switch element forms a path between the first power supply and the PDP in a period in which the voltage of the PDP is maintained at the sustain voltage of the first polarity, and the voltage of the PDP is a first polarity. It characterized in that the path between the first power supply and the PDP is blocked when falling at the sustain voltage of.

In the energy recovery apparatus, the second switch element forms a path between the second power supply and the PDP in a period in which the voltage of the PDP is maintained at the sustain voltage of the second polarity, and the voltage of the PDP is set to the first. The path between the second power supply and the PDP is blocked when the voltage rises to the sustain voltage of the polarity.

In the energy recovery device, the third switch element forms a path between the inductor and the PDP while the PDP is charged with the sustain voltage of the first polarity while the voltage of the PDP is maintained at the sustain voltage of the second polarity. It is characterized by.

In the energy recovery device, the fourth switch element forms a path between the inductor and the PDP in a period in which the voltage of the PDP is charged with the sustain voltage of the second polarity while the voltage of the PDP is maintained at the sustain voltage of the first polarity. An energy recovery method of a PDP according to an embodiment of the present invention includes connecting a power source generating a sustain voltage to the PDP to charge the PDP, wherein the voltage of the PDP is sustained by the power supply. Charging energy from the power supply to the inductor while maintaining the voltage; and blocking a path between the PDP and the power supply while the inductor is charged with switch elements to induce a reverse voltage to the inductor. And cause the reverse voltage to be supplied to the PDP.

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In the energy recovery method, the inductor stores the energy recovered from the PDP and supplies the reversed voltage to the PDP.

In the energy recovery method, charging the PDP with a voltage from the power source may include charging the PDP with a sustain voltage of a first polarity from a first power source, and a second voltage different from the first polarity from a second power source. Charging the PDP with a sustain voltage of polarity.

Forming a path between the first power supply and the PDP during a period in which the voltage of the PDP is maintained at the sustain voltage of the first polarity, and the voltage of the PDP is at a sustain voltage of the first polarity. And blocking a path between the first power source and the PDP when the device descends.

Forming a path between the second power supply and the PDP during a period in which the voltage of the PDP is maintained at the sustain voltage of the second polarity in the energy recovery method, and wherein the voltage of the PDP is sustain voltage of the first polarity. And blocking a path between the second power supply and the PDP when rising to.

Forming a path between the inductor and the PDP in a period in which the voltage of the PDP is charged to the sustain voltage of the first polarity while the voltage of the PDP is maintained at the sustain voltage of the second polarity. It is done.

Forming a pass between the inductor and the PDP in a period in which the voltage of the PDP is charged to the sustain voltage of the second polarity while the voltage of the PDP is maintained at the sustain voltage of the first polarity. It features.

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 14.

Referring to FIG. 7, an energy recovery apparatus of a PDP according to an exemplary embodiment of the present invention uses a panel capacitor Cp equivalently formed at first and second electrodes of the PDP, and a voltage of a first polarity (+ VS). A first sustain voltage source (+ VS) to be generated, a second sustain voltage source (-VS) to generate a voltage (-VS) of a second polarity different from the first polarity, a first sustain voltage source (+ VS) and a panel capacitor One end of (Cp), that is, the first switch Q1 connected between the first electrode, the second switch Q2 connected between the second sustain voltage source (-VS) and the first electrode, and the first and the first The inductor L connected between the first node point N1 between the two switches Q1 and Q2 and the second node point N2 between the first and second voltage sources + Vs and -Vs, and the inductor Third and fourth switches Q3 and Q4 connected in parallel between L and the first node point N1 are provided.

The first sustain voltage source + VS generates a positive sustain voltage + VS supplied to the panel capacitor Cp. The second sustain voltage source (-VS) generates a negative sustain voltage (-VS) supplied to the panel capacitor Cp.

Each of the first and second switches Q1 and Q2 is connected in parallel to one end of the panel capacitor Cp, that is, to the first node point (first electrode). The inductor L is connected in series to the panel capacitor Cp to store energy and recover and supply the charged energy to the panel capacitor Cp using the reverse voltage formed at the time of energy recovery. Each of the third and fourth switches Q3 and Q4 is connected in parallel in different directions between the inductor L and the first node point N1.

The first to fourth switches Q1 to Q4 control the flow of current while being turned on and off. Diodes are connected in parallel to each of the first to fourth switches Q1 to Q4. The diodes may be used as internal diodes of the first to fourth switches Q1 to Q4. Also, diodes can be used as external diodes. On the other hand, each of the first to fourth switches Q1 to Q4 is a semiconductor switch element, for example, any one of MOS FET, IGBT, SCR, BJT.

On the other hand, between the third switch S3 and the first node point N1, a first diode D2 for disconnecting the reverse current from the panel capacitor Cp is connected, and the fourth switch A4 and the first switch are connected. A second diode D2 for disconnecting the reverse current from the fourth switch Q4 is connected between the node points N1.

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

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

The T0 period is divided into a TA period in which only the first switch Q1 is turned on, and a TB period in which both the first and fourth switches Q1 and Q4 are turned on.

In the TA period of the T0 period, the first switch Q1 is turned on so that the first sustain voltage source (+ VS), the first switch Q1, the first node point N1, and the panel capacitor as shown in FIG. Current paths leading to Cp, the second node point N2, and the first sustain voltage source (+ VS) are formed. Accordingly, the panel capacitor Cp charges the sustain voltage + VS supplied from the first sustain voltage source + VS.

In the TB period of the T0 period, the fourth switch Q4 is turned on while the first switch Q1 is turned on, so that the first sustain voltage source + VS and the first switch Q1 as shown in FIG. 10. ), The first node point N1, the second diode D2, the fourth switch Q4, the inductor L, the second node point N2, and the current path leading to the first sustain voltage source (+ VS) Is formed. Accordingly, the sustain voltage + VS charged in the panel capacitor Cp is maintained, and the inductor L charges the current IL from the first sustain voltage source + VS.

In the T1 period, the fourth switch Q4 remains turned on while the first switch Q1 is turned off, so that the inductor L, the panel capacitor Cp, and the first switch as shown in FIG. A current path is formed that leads to the node point N1, the second diode D2, the fourth switch Q4, and the inductor L. Accordingly, the inductor L recovers and supplies the charged current to the panel capacitor Cp by using the reverse voltage generated by the counter electromotive force when the first switch Q1 is turned off. Therefore, the panel capacitor Cp falls to the negative sustain voltage (-VS) by the reverse voltage supplied from the inductor L. As described above, the inductor L recovers and supplies the charged current to the panel capacitor Cp by using the reverse voltage, so that the falling slope of the sustain voltage waveform can be increased.

The T2 period is divided into a TC period in which only the second switch Q2 is turned on, and a TD period in which both the second and third switches Q2 and Q3 are turned on.

In the TC period of the T2 period, the second switch Q2 is turned on so that the second sustain voltage source (-VS), the second node point N2, the panel capacitor Cp, and the first node as shown in FIG. A current path is formed that leads to the point N1, the second switch Q2, and the second sustain voltage source -VS. Accordingly, the panel capacitor Cp receives the negative sustain voltage (-VS) from the second sustain voltage source (-VS) to maintain the negative sustain voltage (-VS) in the T1 period.

In the TD period of the T2 period, when the third switch Q3 is turned on while the second switch Q2 is turned on, as shown in FIG. 13, the second sustain voltage source (-VS) and the second node point ( N2), an inductor L, a third switch Q3, a first diode D1, a first node point N1, a second switch Q2, and a current path leading to the second sustain voltage source (-VS) Is formed. Accordingly, the negative sustain voltage (-VS) charged in the panel capacitor Cp is maintained, and the inductor L charges the current IL from the second sustain voltage source -VS.

In the T3 period, the third switch Q3 remains turned on while the second switch Q2 is turned off, so that the inductor L, the third switch Q3, and the third switch as shown in FIG. Current paths leading to the first diode D1, the first node point N1, the panel capacitor Cp, the second node point N2, and the inductor L are formed. Accordingly, the inductor L recovers and supplies the charged current to the panel capacitor Cp by using the reverse voltage generated by the counter electromotive force when the second switch Q2 is turned off. Therefore, the panel capacitor Cp rises to the sustain voltage (+ VS) by the reverse voltage supplied from the inductor L. The rising slope of the sustain voltage waveform can be increased by recovering and supplying the charged current to the panel capacitor Cp using the reverse voltage induced by the inductor L.

As such, the periods T0 to T3 are periodically repeated, an AC sustain pulse is supplied to the panel capacitor Cp. In fact, the AC driving pulses supplied to the first electrode Y and the second electrode Z of the PDP are generated while the above-described T0 to T3 periods are periodically repeated.

The energy recovery device and recovery method of the PDP according to the embodiment of the present invention charges the energy to the inductor L while the sustain voltage (+ VS) is supplied to the panel capacitor Cp, and the reverse voltage at the time of energy recovery. By using this method, the energy charged in the panel capacitor Cp is recovered and simultaneously supplied. As a result, the rising and falling slope of the sustain waveform can be accelerated during energy recovery.

As described above, the PDP energy recovery apparatus and recovery method according to an embodiment of the present invention is charged to the inductor while the sustain voltage is supplied to the panel capacitor, and charged to the panel capacitor using the reverse voltage at the time of energy recovery The energy is recovered and supplied at the same time. As a result, the rising and falling slope of the sustain waveform can be accelerated during energy recovery. In addition, the present invention has the advantage that the energy recovery device can be configured only on either one of the first and second electrodes of the PDP, and there is only one switch element on the sustain current path to minimize the conduction loss by the switch element. can do. On the other hand, since the present invention uses four switch elements and two diodes, power consumption 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. 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 switches shown in FIG. 7 and an output waveform of the panel capacitor. FIG.

FIG. 9 is a circuit diagram showing on / off states and current paths of switches in a TA period during the T0 period shown in FIG. 8; FIG.

FIG. 10 is a circuit diagram showing on / off states and current paths of switches in a TB period during a T0 period shown in FIG. 8; FIG.

FIG. 11 is a circuit diagram showing on / off states and current paths of switches in the T1 period shown in FIG. 8; FIG.

FIG. 12 is a circuit diagram showing on / off states and current paths of switches in a TC period during the T2 period shown in FIG. 8; FIG.

FIG. 13 is a circuit diagram showing on / off states and current paths of switches in the TD period during the T2 period shown in FIG. 8; FIG.

FIG. 14 is a circuit diagram showing on / off states and current paths of switches in the period T3 shown in FIG. 8; FIG.

<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

Claims (15)

Plasma display panel, A power supply generating a sustain voltage, An inductor for charging energy from the power supply while the voltage of the panel is maintained by the power supply with the sustain voltage; And a switch device for blocking a path between the panel and the power supply while the inductor is charged with energy so that a reverse voltage is induced in the inductor and the reverse voltage is supplied to the panel. Panel energy recovery device. The method of claim 1, The inductor stores energy recovered from the panel and supplies the reversed voltage induced to the panel. The method of claim 1, The power source, A first power source for charging the panel to a sustain voltage of a first polarity; And a second power source for charging the panel to a sustain voltage having a second polarity different from that of the first polarity. The method of claim 3, wherein The switch elements, A first switch element connected between the first power source and the panel; A second switch element connected between the second power supply and the panel; Third and fourth switch elements connected in parallel between the inductor and the panel; A first diode connected between the third switch and the panel to block reverse current from the panel; And a second diode connected between the fourth switch and the panel to block reverse current from the fourth switch. The method of claim 4, wherein The first switch element, Forming a path between the first power supply and the panel in a period where the voltage of the panel is maintained at the sustain voltage of the first polarity, And cut off the path between the first power supply and the panel when the voltage of the panel falls at the sustain voltage of the first polarity. The method of claim 4, wherein The second switch element, Forming a path between the second power supply and the panel in a period where the voltage of the panel is maintained at the sustain voltage of the second polarity, And cut off a path between the second power supply and the panel when the voltage of the panel rises to the sustain voltage of the first polarity. The method of claim 4, wherein Wherein the third switch element forms a path between the inductor and the panel in a period in which the voltage of the panel is maintained at the sustain voltage of the second polarity and is charged with the sustain voltage of the first polarity. Energy recovery device for display panel. The method of claim 4, wherein And the fourth switch element forms a path between the inductor and the panel in a period in which the voltage of the panel is maintained at the sustain voltage of the first polarity and charged to the sustain voltage of the second polarity. Energy recovery device of plasma display panel. In the energy recovery method of the plasma display panel, Charging the panel by connecting a power source generating a sustain voltage to the panel; Charging energy from the power supply to the inductor while the voltage of the panel is maintained by the power supply at the sustain voltage; Cutting off a path between the panel and the power supply in a state where energy is charged in the inductor by using switch elements, causing a reverse voltage to be induced in the inductor and supplying the reverse voltage to the panel. An energy recovery method of a plasma display panel. The method of claim 9, The inductor stores energy recovered from the panel and supplies the reversed voltage induced to the panel. The method of claim 9, Charging the panel with a voltage from the power source, Charging the panel with a sustain voltage of a first polarity from a first power source; And charging the panel with a sustain voltage of a second polarity different from the first polarity from a second power source. The method of claim 11, Forming a path between the first power supply and the panel in a period where the voltage of the panel is maintained at the sustain voltage of the first polarity; And blocking a path between the first power supply and the panel when the voltage of the panel falls at the sustain voltage of the first polarity. The method of claim 11, Forming a path between the second power supply and the panel in a period where the voltage of the panel is maintained at the sustain voltage of the second polarity; Blocking the path between the second power supply and the panel when the voltage of the panel rises to the sustain voltage of the first polarity. The method of claim 11, Forming a path between the inductor and the panel during a period in which the voltage of the panel is maintained at the sustain voltage of the second polarity and charged with the sustain voltage of the first polarity. Energy recovery method. The method of claim 11, Forming a path between the inductor and the panel during a period of charging with the sustain voltage of the second polarity while the voltage of the panel is maintained at the sustain voltage of the first polarity. Panel energy recovery method.