KR20040032510A - Apparatus for driving of plasma display panel - Google Patents

Abstract

PURPOSE: An apparatus for driving a plasma display panel is provided to allow a unified printed circuit board of one sustain driving device by supplying an alternative current sustain pulse to only one selected from a pair of sustain electrodes. CONSTITUTION: An apparatus for driving a plasma display panel includes a display panel, a first retrieve circuit and a second retrieve circuit. The display panel includes a plurality of pixels formed at cross-sections between the first and the second sustain electrodes for generating the sustain discharge and the address electrodes. The first retrieve circuit is connected between the positive voltage source(52) and the display panel for charging the positive voltage to the display panel from the positive voltage source(52) as well as retrieves the charged positive voltage. And, the second retrieve circuit is connected between the negative voltage source(54) and the first retrieve circuit for charging the negative voltage from the negative voltage source(54) to the display panel as well as retrieves the charged negative voltage.

Description

A device for driving a plasma display panel {APPARATUS FOR DRIVING OF PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device of a plasma display panel, and more particularly, to a driving device of a plasma display panel capable of supplying a positive and negative sustain voltage to only one of a pair of sustain electrodes to unify a printed circuit board.

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, field emission displays, plasma display panels (hereinafter referred to as " PDPs ") and electro-luminescence displays. Device and the like.

Among such flat panel displays, the PDP displays an image by ultraviolet light emitted from an inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne, and the like emitting phosphors. Such PDPs are used for high resolution televisions, monitors, and indoor / outdoor advertising because they have fast response speed and are suitable for displaying large-area images.

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 subfields SF1 to SF12 are further divided into a reset period, an address period, a sustain period, and an erase period to be driven.

Here, the reset period is a period in which uniform wall charges are formed in the discharge cells, the address period is a period in which selective address discharge occurs in accordance with 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.

2 is a diagram showing an energy recovery device installed to recover the sustain discharge voltage.

Referring to FIG. 2, the conventional energy recovery apparatuses 30 and 32 are symmetrically installed with each other 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 the sustain pulse to the first electrode (Y). The second energy recovery device 32 supplies a sustain pulse having a phase different from that of the sustain pulse supplied to the first electrode Y while operating alternately with the first energy recovery device 30. .

Such a configuration of the conventional energy recovery device (30, 32) 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. Here, the second and fourth switches S2 and S4 have a breakdown voltage of at least 2Vs or more.

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 timings of the switches of the first energy recovery device 30 and output waveforms 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, as shown in FIG. 4, 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. Therefore, as shown in FIG. 4, 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, each of the conventional first and second energy recovery apparatuses 30 and 32 are installed and operated on separate printed circuit boards, so that many circuit components (such as switching elements) are required and power consumption is increased. do. Accordingly, there is a problem that the manufacturing cost is increased.

Accordingly, an object of the present invention is to provide a driving apparatus for a plasma display panel capable of supplying a positive and negative sustain voltage to only one of the sustain electrode pairs to unify a printed circuit board.

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

2 is a view showing a conventional energy recovery device provided for recovering a sustain discharge voltage.

FIG. 4 is a timing diagram and waveform diagram showing on / off timing of the switches shown in FIG. 3 and an output waveform of the panel capacitor. FIG.

4 is a waveform diagram showing a voltage applied to a panel capacitor by the energy recovery device shown in FIG.

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

FIG. 6 is a timing diagram and waveform diagram showing on / off timing of the switches shown in FIG. 5 and an output waveform of the panel capacitor. FIG.

FIG. 7 is a waveform diagram illustrating a voltage applied to a panel capacitor by the energy recovery device shown in FIG. 5.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y: first electrode

12Z: Second electrode 14: Upper dielectric layer

16: protective film 18: lower substrate

20X: address electrode 22: lower dielectric layer

24: partition 26: phosphor

30, 32, 50: energy recovery device 52: positive sustain pulse voltage section

54: negative sustain pulse voltage section

In order to achieve the above object, a driving apparatus of a plasma display panel according to an exemplary embodiment of the present invention includes pixel cells formed at an intersection of first and second sustain electrodes and an address electrode to cause a sustain discharge. A first recovery circuit connected between the display panel and the positive voltage source and the display panel to charge the display panel with a positive voltage from the positive voltage source and to recover the charged positive voltage; And a second recovery circuit connected between a negative voltage source and the first recovery circuit to charge the display panel with a negative voltage from the negative voltage source and to recover the charged negative voltage. do.

In the driving apparatus, any one of the first sustain electrode and the second sustain electrode of the display panel is connected to a base voltage source, and the other is connected to the first recovery circuit.

In the driving device, the positive voltage source supplies a positive voltage, which is half of the sustain pulse for the sustain discharge, to the first recovery circuit, and the negative voltage source is a negative voltage, which is half of the sustain pulse for the oil dielectric. It is characterized by supplying to the second recovery circuit.

The driving device may further include a switching element connected between a base voltage source and the display panel to switch the base voltage from the base voltage source to the display panel.

In the driving device, a first recovery circuit is connected to the positive voltage source in parallel to the first capacitor for energy recovery to charge the positive energy during charge and discharge of the display panel, the first capacitor for energy recovery and the display panel. A first switch circuit connected between the display panel and the first switch circuit to form a charge / recovery path of the positive voltage and a positive voltage from the first capacitor for energy recovery. And a first capacitor for holding the positive sustain pulse charged in the display panel, and a first inductor connected between the first capacitor for charging and the display panel.

In the driving device, the first switch circuit includes a first switch connected between the positive voltage source and the first inductor, and a connection between the first switch and the first inductor and the first capacitor for charging and the first switch. And a third switch for switching the signal path of the first inductor, and a third switch connected between the second switch and the display panel to switch the voltage charged in the charging first capacitor to the display panel. It is done.

In the driving apparatus, the first switch circuit further includes a first diode connected between the second switch and the first solvent of the charging solvent, and a second diode connected between the second switch and the first inductor. It features.

In the driving device, the second recovery circuit is connected to the negative voltage source in parallel to the second capacitor for energy recovery to charge the negative energy during charge and discharge of the display panel, the second capacitor for energy recovery and the display A second switch circuit connected between the panels to form a charge / recovery path of the negative voltage and a negative voltage from the second capacitor for energy recovery connected between the display panel and the second switch circuit; And a second capacitor for holding the negative sustain pulse charged in the display panel, and a second inductor connected between the second capacitor for charging and the display panel.

In the driving device, the second switch circuit includes a fourth switch connected between the negative voltage source and the second inductor, and the second switch for charging and the second inductor connected between the fourth switch and the second inductor. And a fifth switch for switching the signal path of the second inductor, and a sixth switch connected between the fifth switch and the display panel to switch the voltage charged in the charging second capacitor to the display panel. It is done.

In the driving device, the second switch circuit further includes a third diode connected between the fifth switch and the charging second capacitor, and a fourth diode connected between the fifth switch and the second inductor. It is characterized by.

In the driving device, the first inductor and the second inductor may be used in common.

In the driving device, the second switch and the fifth switch are used in common.

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. 5 to 7.

Referring to FIG. 5, a driving device of a plasma display panel according to an exemplary embodiment of the present invention is a panel capacitor Cp. An energy recovery device 50 is connected to the panel capacitor Cp to supply an AC sustain pulse to the panel capacitor Cp.

The panel capacitor Cp equivalently represents the capacitance formed between the first electrode Y and the second electrode Z. FIG. At this time, one of the first electrode Y and the second electrode Z is connected to the energy recovery device 50 and the other is connected to the ground voltage source GND. Hereinafter, it is assumed that the energy recovery device 50 supplies the AC sustain pulse to the first electrode (Y).

The energy recovery device 50 is disposed on one printed circuit board (not shown) to supply the positive and negative alternating current sustain pulses to the panel capacitor Cp. The energy recovery apparatus 50 recovers the voltage between the first electrode Y and the second electrode Z and uses the voltage recovered as the driving voltage at the next discharge.

To this end, the energy recovery device 50 includes first and second switches S1 and S2 connected in parallel with the first node N1 interposed therebetween, and a positive sustain pulse voltage connected to the first switch S1. Third and third parallel connections between the unit 52, the negative sustain voltage unit 54 connected to the second switch S2, and the second node N2 connected to the panel capacitor Cp. Fourth and sixth switches connected in parallel with four switches S3 and S3, the inductor L1 connected between the second node N2 and the third node N3, and the third node N3. The second capacitor Ca for charging, connected between the switches S5 and S6, the third switch S3 and the fifth switch S5 to charge the positive sustain voltage, the fourth switch S4 and the first switch. A second charging capacitor Cb connected between the five switches S5 to charge the negative sustain voltage and a seventh switch S7 connected between the panel capacitor Cp and the ground voltage source GND.

The first and second switches S1 and S2 are alternately switched to charge the first and second capacitors Ca and Cb for charging the positive sustain voltage (+ Vs / 2) and the negative sustain (-Vs / 2). Switch to).

The positive sustain voltage section 52 includes a 1/2 sustain voltage source Vs / 2 connected between the first switch S1 and the ground voltage source GND, a 1/2 sustain voltage source Vs / 2 and the ground voltage source. The first capacitor Cs + for energy recovery connected in parallel with the 1/2 sustain voltage source Vs / 2 is provided between (GND).

The 1/2 sustain voltage source (Vs / 2) supplies the 1/2 capacitor voltage (Vs / 2) to the panel capacitor (Cp), and the first capacitor (Cs +) for energy recovery is supplied to the panel capacitor (Cp) during the sustain discharge. The charged voltage is recovered and charged, and the charged voltage is supplied again to the panel capacitor Cp. At this time, the first capacitor Cs + for energy recovery is charged with a voltage of + Vs / 2 corresponding to half of the half sustain voltage source Vs / 2.

The negative sustain voltage section 54 includes a -1/2 sustain voltage source (-Vs / 2) connected between the second switch S2 and the ground voltage source GND, and a -1/2 sustain voltage source (-Vs / 2). ) And a second capacitor Cs- for energy recovery connected in parallel with the -1/2 sustain voltage source (-Vs / 2) between the base voltage source and the ground voltage source GND.

The -1/2 sustain voltage source (-Vs / 2) supplies -1/2 sustain voltage (-Vs / 2) to the panel capacitor (Cp), and the second capacitor (Cs-) for energy recovery is the panel during the sustain discharge. The voltage charged in the capacitor Cp is recovered and charged, and the charged voltage is resupplied to the panel capacitor Cp. At this time, the second capacitor Cs- for energy recovery is charged with a voltage of -Vs / 2 corresponding to half the value of the -1/2 sustain voltage source (-Vs / 2).

The fifth switch S5 is connected between the fourth node N4 and the third node N3 connected to the first node N1 to charge the voltage on the first node N1, and the first capacitor Ca for charging. Switch to the side. At this time, the first diode D1 is connected between the fifth switch S5 and the third node N3, and the second diode D2 is connected between the fifth switch S5 and the first capacitor Ca for charging. ) Is connected.

The charging first capacitor Ca charges the positive voltage (+ Vs / 2) on the first node N1 according to the switching of the fifth switch S5. The positive voltage (+ Vs / 2) charged in the charging first capacitor Ca is added to the positive voltage (Vs / 2) charged in the first capacitor Cs + for energy recovery and the positive sustain voltage (+ Vs). ) Is supplied to the panel capacitor Cp. Meanwhile, the first and second diodes D1 and D2 play a role of forming a current path only in a predetermined direction. In particular, the second diode D2 serves to block the positive sustain voltage + Vs generated by the first capacitor Ca for charging from affecting the first capacitor Cs + for energy recovery.

The sixth switch S6 is connected between the fifth node N5 and the third node N3 connected with the first node N1 to charge the voltage on the first node N1 with the second capacitor Cb for charging. Switch to the side. At this time, the third diode D3 is connected between the sixth switch S6 and the third node N3, and the fourth diode D4 is connected between the sixth switch S6 and the charging second capacitor Cb. ) Is connected.

The charging second capacitor Cb charges the negative voltage (−Vs / 2) on the first node N1 according to the switching of the sixth switch S6. The negative voltage (-Vs / 2) charged in the first capacitor Ca for charging is added to the negative voltage (-Vs / 2) charged in the second capacitor Cs- for energy recovery to add a negative sustain voltage ( -Vs) and is supplied to the panel capacitor Cp. Meanwhile, the third and fourth diodes D3 and D4 play a role of forming a current path only in a predetermined direction. In particular, the fourth diode D4 serves to block the negative sustain voltage -Vs generated by the charging second capacitor Cb from affecting the second capacitor Cs- for energy recovery.

The third switch S3 supplies the positive sustain voltage (+ Vs) charged in the charging first capacitor Ca to the panel capacitor Cp to supply the positive sustain voltage (+ Vs) to the panel capacitor Cp. ) Is prevented from falling below the sustain voltage (Vs).

The fourth switch S4 supplies the panel capacitor Cp with the negative sustain voltage (-Vs) charged in the third capacitor Cb so that the negative sustain voltage (-Vs) supplied with the panel capacitor Cp is applied. Prevents the rise above the sustain voltage (-Vs). Here, the third and fourth switches S3 and S4 can be driven by a field effect transistor having a breakdown voltage of Vs.

The inductor L forms a resonance circuit together with the panel capacitor Cp. The seventh switch S7 connects the panel capacitor Cp to the ground voltage source GND in accordance with the switching.

6 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 5 and output waveforms of panel capacitors.

Referring to FIG. 6 and FIG. 5, an operation process of the driving apparatus of the plasma display panel according to an exemplary embodiment of the present invention will be described.

First, it is assumed that the voltage charged between the first electrode Y and the second electrode Z, that is, the voltage charged to the panel capacitor Cp, before the period T1 is 0 volts. In addition, it is assumed that voltages of Vs / 2 and -Vs / 2 are respectively charged in the first and second capacitors Cs + and Cs- and the first and second capacitors Ca and Cb for energy recovery, respectively. .

In the (T1) period, the first and fifth switches S1 and S5 are turned on, and the second to fourth switches S2 to S4 maintain a turn-off state. . In addition, the seventh switch S7 is turned off in the turn-on state. Accordingly, in this case, the first switch S1 is turned on so that the first switch S1, the first node N1, the fourth node N4, and the fifth switch from the first capacitor Cs + for energy recovery are turned on. A current path leading to S5, the first diode D1, the third node N3, the inductor L, and the panel capacitor Cp is formed. At this time, the inductor L, the panel capacitor Cp, and the charging first capacitor Ca form an LC series resonant circuit.

Since the first capacitor Cs + for energy recovery and the first capacitor Ca for charging are charged with a voltage of positive voltage Vs / 2, the panel capacitor ( The voltage of Cp) rises to Vs which is the sum of the voltage of the first capacitor Cs + for energy recovery and the voltage of the first capacitor Ca for charging. At this time, the third node N3 maintains the 1/2 sustain voltage Vs / 2 by turning on the fifth switch S5. In the second node N2, the resonance pulse rises above the 1/2 sustain voltage Vs / 2 by the LC series resonant circuit, but is prevented by the first diode D1, and the 1/2 sustain voltage Vs / 2) will be maintained. Therefore, the 1/2 sustain voltage Vs / 2 of the second node N2 and the 1/2 sustain voltage Vs already charged in the sixth node N6, which is the (+) terminal of the first capacitor Ca. / 2) is added to obtain the desired sustain voltage (Vs).

Since the voltage of the panel capacitor Cp rises to the positive sustain voltage (+ Vs) in the period (T1), the driving power supplied from the outside to cause the sustain discharge is minimized to Vs / 2.

In the period (T2), the third switch S3 is turned on, and the first and fifth switches S1 and S5 remain turned on and the second, fourth, sixth, seventh switches S2, S4, S6, and S7 remain turned off. As described above, when the third switch S3 is turned on, the voltage from the positive sustain voltage source Vs / 2 and the voltage of the charging first capacitor Ca are added to the back voltage + Vs. The panel capacitor Cp maintains the positive sustain voltage Vs by being supplied to the panel capacitor Cp via the two nodes N6 and N2. During this period (T2), the first capacitor Ca has the 1/2 sustain voltage Vs by the voltage supplied via the fifth switch S5 since the fifth switch S5 is kept turned on. / 2). To this end, the turn-off time point of the fifth switch S5 is the same as the turn-off time point of the third switch S3. The second diode D2 blocks the current path so that the current of the charging first capacitor Ca does not flow to the positive sustain voltage source Vs / 2.

In the period T3, the third and fifth switches S3 and S5 are turned off and the sixth switch S6 is turned on. In addition, the first switch S1 maintains a turn-on state, and the second, fourth and seventh switches S2, S4, and S7 maintain a turn-off state. Accordingly, a current path is formed from the panel capacitor Cp to the first capacitor Cs + for energy recovery through the inductor L, the sixth switch S6, and the first switch S1, thereby forming the panel capacitor Cp. The charged voltage is recovered by the first capacitor Cs + for energy recovery, and the panel capacitor Cp is lowered to the base potential. In other words, the panel capacitor Cp is discharged, and the voltage component of the reactive power discharged from the panel capacitor Cp is the inductor L, the third diode D3, the sixth switch S6 and the first switch ( It is recovered through S1) and charged in the first capacitor Cs + for energy recovery.

Subsequently, in the period (T4), the first switch S1 is turned off and the seventh switch S7 is turned on. In addition, in the period (T4), the second to fifth switches S2 to S5 maintain the turn-off state, and the sixth switch S6 maintains the turn-on state. In this case, the sixth switch S6 may be turned off while the seventh switch S7 is turned on. Accordingly, when the seventh switch S7 is turned on, a current path is formed from the panel capacitor Cp to the base voltage source GND, so that the voltage of the panel capacitor Cp is in the electrostatic voltage state.

Then, in the period (T5), the second switch S2 is turned on, and the first and third switches S1 and S3 to S5 turn off. Keep it. In addition, the seventh switch S7 is turned off in the turn-on state. Accordingly, in this case, the second switch S2 is turned on so that the second switch S2, the first node N1, the fourth node N5, and the sixth from the second capacitor Cs- for energy recovery. A current path is formed which leads to the switch S5, the third diode D3, the third node N3, the inductor L and the panel capacitor Cp. At this time, the inductor L, the panel capacitor Cp, and the charging second capacitor Cb form an LC series resonant circuit.

Since the second capacitor Cs- and the second capacitor Cb for energy recovery are charged with a negative voltage of -Vs / 2, the panel is charged and discharged by the current of the inductor L in the LC series resonant circuit. The voltage of the capacitor Cp rises to -Vs which is the sum of the voltage of the second capacitor Cs- for energy recovery and the voltage of the second capacitor Cb for charging. At this time, the third node N3 maintains the negative 1/2 sustain voltage (-Vs / 2) by turning on the sixth switch S6. In the second node N2, the resonance pulse rises above the negative 1/2 sustain voltage (-Vs / 2) by the LC series resonant circuit, but is blocked by the third diode D3 and the negative polarity 1/2. The sustain voltage (-Vs / 2) is maintained. Accordingly, the negative polarity 1/1 already charged in the negative 1/2 sustain voltage (-Vs / 2) of the second node N2 and the seventh node N7 which is the negative terminal of the second capacitor Cb. Two sustain voltages (-Vs / 2) are added to obtain a negative sustain voltage (-Vs) to be obtained.

Since the voltage of the panel capacitor Cp has risen to the negative sustain voltage (-Vs) in the period (T5), the driving power supplied from the outside to cause the sustain discharge is minimized to -Vs / 2.

In the period (T6), the fourth switch S4 is turned on, and the second and sixth switches S2 and S6 remain turned on and the first, third, fifth, and seventh switches S1, S3, S5, and S7 remain turned off. As such, when the fourth switch S4 is turned on, the back voltage (-Vs) obtained by adding the voltage from the negative sustain voltage source (-Vs / 2) and the voltage of the charging second capacitor Cb is equal to 7th and The panel capacitor Cp maintains the negative sustain voltage (-Vs) by being supplied to the panel capacitor Cp via the second nodes N7 and N2. During this (T6) period, since the sixth switch S6 maintains the turn-on state, the second capacitor Cb has a negative 1/2 sustain voltage due to the voltage supplied via the sixth switch S6. Keep (-Vs / 2). To this end, the turn-off time point of the sixth switch S6 is the same as the turn-off time point of the fourth switch S4. The fourth diode D4 blocks the current path so that the current of the charging second capacitor Cb does not flow through the negative sustain voltage source -Vs / 2.

In the period T7, the fourth and sixth switches S4 and S6 are turned off and the fifth switch S5 is turned on. In addition, the second switch S2 maintains a turn-on state, and the first, third and seventh switches S1, S3, and S7 maintain a turn-off state. Accordingly, a current path is formed from the panel capacitor Cp to the second capacitor Cs- for energy recovery through the inductor L, the fifth switch S5, and the second switch S2 to form the panel capacitor Cp. ) Is charged to the energy recovery second capacitor (Cs-) and the panel capacitor (Cp) is lowered to the ground potential. In other words, the panel capacitor Cp is discharged, and the voltage component of the reactive power discharged from the panel capacitor Cp is the inductor L, the first diode D1, the fifth switch S5 and the second switch ( It is recovered through S2) and charged in the second capacitor Cs- for energy recovery.

Next, in the period (T8), the second and fifth switches S2 and S5 are turned off and the seventh switch S7 is turned on. Further, in the period (T8), the first, third, fourth, and sixth switches S1, S3, S4, and S6 remain turned off. Accordingly, when the seventh switch S7 is turned on, a current path is formed from the panel capacitor Cp to the base voltage source GND, so that the voltage of the panel capacitor Cp is in the electrostatic voltage state.

As shown in FIG. 7, the driving apparatus of the plasma display panel according to the embodiment of the present invention is obtained by periodically repeating the operation process during the above-mentioned (T1) to (T8) period in the first electrode (Y). Supply AC sustain pulse. In addition, since the second electrode Z does not need a separate driving circuit, the second electrode Z is only connected to the base voltage source through a heat sink (not shown) or a frame. Accordingly, the AC driving pulse is supplied to the panel capacitor Cp as shown in FIG. 7.

As described above, the driving device of the plasma display panel according to the embodiment of the present invention is a positive sustain pulse and a negative polarity using a positive 1/2 voltage source and a negative 1/2 voltage source installed on one printed circuit board. The sustain pulses are simultaneously generated and the generated AC sustain pulses are supplied to any one of the sustain electrode pairs, and the reference voltage is supplied to the other one of the sustain electrode pairs. Accordingly, the present invention supplies an alternating current sustain pulse to only one of the sustain electrode pairs, thereby enabling a single printed circuit board configuration of one sustain drive device. Furthermore, the present invention lowers the breakdown voltage of the switch elements from the sustain voltage (2Vs) to the sustain voltage (Vs) of the switch elements by lowering the sustain voltage (Vs) by 1/2 compared to the conventional energy recovery circuit. The cost can be reduced by configuring the devices.

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.

Claims (12)

A display panel in which pixel cells formed at intersections of the first and second sustain electrodes and the address electrode for generating a sustain discharge are arranged in a matrix form; A first recovery circuit connected between the positive voltage source and the display panel to charge the display panel with a positive voltage from the positive voltage source and to recover the charged positive voltage; And a second recovery circuit connected between the negative voltage source and the first recovery circuit to charge the display panel with a negative voltage from the negative voltage source and to recover the charged negative voltage. A drive device for a plasma display panel. The method of claim 1, Wherein one of the first sustain electrode and the second sustain electrode of the display panel is connected to a base voltage source, and the other is connected to the first recovery circuit. The method of claim 1, The positive voltage source supplies a positive voltage, which is half of the sustain pulse for the sustain discharge, to the first recovery circuit, And the negative voltage source supplies a negative voltage, which is half of the sustain pulse for the sustain discharge, to the second recovery circuit. The method of claim 1, And a switching element connected between the base voltage source and the display panel to switch the base voltage from the base voltage source to the display panel. The method of claim 1, The first recovery circuit, An energy recovery first capacitor connected in parallel with the positive voltage source to charge positive energy during charge and discharge of the display panel; A first switch circuit connected between the first capacitor for energy recovery and the display panel to form a charge / recovery path of the positive voltage; A charging first capacitor connected between the display panel and the first switch circuit to hold the positive sustain pulse charged in the display panel using a positive voltage from the first capacitor for energy recovery; And a first inductor connected between the charging first capacitor and the display panel. The method of claim 5, wherein The first switch circuit, A first switch connected between the positive voltage source and the first inductor; A second switch connected between the first switch and the first inductor to switch signal paths of the charging first capacitor and the first inductor; And a third switch connected between the second switch and the display panel to switch the voltage charged in the first capacitor for charging to the display panel. The method of claim 6, The first switch circuit, A first diode connected between the second switch and the charging first capacitor, And a second diode connected between the second switch and the first inductor. The method of claim 1, The second recovery circuit, A second capacitor for energy recovery connected in parallel with the negative voltage source to charge negative energy during charging and discharging of the display panel; A second switch circuit connected between the second capacitor for energy recovery and the display panel to form a charge / recovery path of the negative voltage; A charging second capacitor connected between the display panel and the second switch circuit to hold a negative sustain pulse charged in the display panel using a negative voltage from the second capacitor for energy recovery; And a second inductor connected between the charging second capacitor and the display panel. The method of claim 8, The second switch circuit, A fourth switch connected between the negative voltage source and the second inductor; A fifth switch connected between the fourth switch and the second inductor to switch signal paths of the charging second capacitor and the second inductor; And a sixth switch connected between the fifth switch and the display panel to switch the voltage charged in the charging second capacitor to the display panel. The method of claim 9, The second switch circuit, A third diode connected between the fifth switch and the charging second capacitor, And a fourth diode connected between the fifth switch and the second inductor. The method according to claim 5 or 8, And the first inductor and the second inductor are used in common. The method according to claim 6 or 9, And the second switch and the fifth switch are used in common.