KR100508243B1 - Apparatus for driving of plasma display panel - Google Patents

Abstract

The present invention relates to a driving device of a plasma display panel that can lower power consumption and unify a printed circuit board.

An apparatus for driving a plasma display panel according to an exemplary embodiment of the present invention includes a plasma for supplying a sustain electrode having an alternating scan electrode and a sustain electrode and a sustain pulse having a positive sustain voltage connected to any one of the scan electrode and the sustain electrode. A first energy recovery circuit having a panel capacitor equivalently formed in a discharge cell of a display panel and a first inductor forming a resonance circuit, and one of the scan electrode and sustain electrode to which the first energy recovery circuit is connected; And a second energy recovery circuit having a second inductor which is connected to form a resonant circuit with the panel capacitor for alternately supplying a sustain pulse having a negative sustain 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 plasma display panel, and more particularly, to a driving device of a plasma display panel capable of lowering power consumption and unifying 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 Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP), and Electro-Luminescence (EL). And display devices.

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 scan electrode Y and a sustain electrode Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 18. X).

Each of the scan electrode Y and the sustain electrode Z has a line width smaller than that of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z, and the metal bus electrode 13Y is formed at one edge region of the transparent electrode. , 13Z). The transparent electrodes 12Y and 12Z are usually formed on the upper substrate 10 by indium tin oxide (hereinafter, referred to as “ITO”). The metal bus electrodes 13Y and 13Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the sustain electrode Z side by side. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. 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 X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24.

The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The partition wall 24 is formed in parallel with the address electrode X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe, and He + Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 18 and the partition wall 24.

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 scan electrode Y and the sustain electrode Z and uses the voltage recovered as the driving 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 scan electrode Y and the sustain electrode Z. FIG.

The first energy recovery device 30 supplies the sustain pulse to the scan electrode (Y). The second energy recovery device 32 alternately operates with the first energy recovery device 30 to supply sustain pulses having a phase different from that of the sustain pulse supplied to the scan electrode Y.

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 of a plasma display panel which can lower power consumption and unify a printed circuit board.

In order to achieve the above object, the driving device of the plasma display panel according to the embodiment of the present invention is connected to any one of the scan electrode and the sustain electrode and the scan electrode and the sustain electrode are formed alternately and has a sustain voltage having a positive sustain voltage A first energy recovery circuit having a panel capacitor equivalently formed in a discharge cell of the plasma display panel and a first inductor forming a resonant circuit for supplying a pulse, the scan electrode to which the first energy recovery circuit is connected; And a second energy recovery circuit having a second inductor which forms a resonant circuit with the panel capacitor to alternately supply a sustain pulse having a negative sustain voltage connected to any one of the sustain electrodes.

In the driving apparatus of the plasma display panel, a ground voltage source is connected to any one of the scan electrode and the sustain electrode to which the first energy recovery circuit is connected.

In the driving apparatus of the plasma display panel, the first energy recovery circuit uses the positive half sustain voltage source having a voltage of half the positive sustain voltage and the positive sustain voltage using the voltage of the positive half sustain voltage source. And a back pressure circuit for generating a voltage.

In the driving apparatus of the plasma display panel, the back voltage circuit is connected between a charging capacitor for charging a voltage of a positive 1/2 sustain voltage source, a charging capacitor and the positive 1/2 sustain voltage source, And a first switch configured to supply a voltage of a sustain voltage source to the charging capacitor, and a first switch disposed between the first diode and the charging capacitor and configured to form a closed circuit with the charging capacitor and the first diode. It is done.

In the driving device of the plasma display panel, after the charging capacitor is charged with the voltage of the positive 1/2 sustain voltage source, the first switch is turned on so that the positive polarity 1 is connected to the negative terminal of the charging capacitor. The positive sustain voltage is generated by supplying a voltage of a / 2 sustain voltage source.

When the voltage of the positive 1/2 sustain voltage source is supplied to the panel capacitor in the driving device of the plasma display panel, the panel capacitor is supplied with the positive sustain voltage due to resonance of the first inductor and the panel capacitor. After the positive sustain voltage is supplied to the panel capacitor, the positive sustain voltage is supplied from the back voltage circuit for a predetermined period of time.

In the driving device of the plasma display panel, a second diode installed between the first switch and the first inductor to prevent reverse current, a common terminal of the second diode and the first inductor, and the positive 1/2 sustain. A second switch connected between the voltage source, a third diode connected between the second switch and the first inductor to prevent reverse current, a third switch connected in parallel between the first inductor and the panel capacitor, and A fourth switch, the third switch is turned on when the positive sustain voltage is supplied from the back voltage circuit to the panel capacitor, and the fourth switch is connected to a base voltage source to provide a base potential to the panel capacitance. It is characterized in that turned on when supplied.

A positive voltage is charged in the charging capacitor when the fourth switch is turned on in the driving device of the plasma display panel.

In the driving apparatus of the plasma display panel, the second energy recovery circuit uses the negative 1/2 sustain voltage source having a voltage of half the negative sustain voltage and the voltage of the negative 1/2 sustain voltage source. And a back pressure circuit for generating a voltage.

In the driving apparatus of the plasma display panel, the back voltage circuit is connected to a charging capacitor for charging a voltage of a negative 1/2 sustain voltage source, and is connected between a charging capacitor and the negative 1/2 sustain voltage source, so that the negative polarity is 1/2. And a first switch configured to supply a voltage of a sustain voltage source to the charging capacitor, and a first switch disposed between the first diode and the charging capacitor and configured to form a closed circuit with the charging capacitor and the first diode. It is done.

In the driving device of the plasma display panel, after the charging capacitor is charged with the voltage of the negative 1/2 sustain voltage source, the first switch is turned on so that the negative polarity 1 is connected to the positive terminal of the charging capacitor. The negative sustain voltage is generated by supplying a voltage of a / 2 sustain voltage source.

When the voltage of the negative 1/2 sustain voltage source is supplied to the panel capacitor in the driving device of the plasma display panel, the panel capacitor is supplied with the negative sustain voltage due to resonance of the second inductor and the panel capacitor. And after the negative sustain voltage is supplied to the panel capacitor, the negative sustain voltage is supplied from the back voltage circuit for a predetermined period of time.

In the driving device of the plasma display panel, a second diode installed between the first switch and the second inductor to prevent reverse current, a common terminal of the second diode and the second inductor, and the negative polarity 1/2 sustain. A second switch connected between the voltage source, a third diode connected between the second switch and the second inductor to prevent reverse current, a third switch connected in parallel between the second inductor and the panel capacitor, and A fourth switch, wherein the third switch is turned on when the negative sustain voltage is supplied from the back voltage circuit to the panel capacitor, and the fourth switch is connected to a base voltage source to provide a base potential to the panel capacitance. It is characterized in that turned on when supplied.

In the driving apparatus of the plasma display panel, when the fourth switch is turned on, a negative voltage is charged in the charging capacitor.

In the driving apparatus of the plasma display panel, the first energy recovery circuit and the second energy recovery circuit are configured on a single board.

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, an apparatus for driving a plasma display panel according to an exemplary embodiment of the present invention may recover an energy for supplying an AC sustain pulse to the panel capacitor Cp and connected to the panel capacitor Cp. Apparatus 50 is provided.

The panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z. FIG. At this time, one of the scan electrode Y and the sustain 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 scan 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 scan electrode Y to the panel capacitor Cp. The energy recovery device 50 recovers the voltage between the scan electrode Y and the sustain electrode Z and uses the voltage recovered as the drive voltage at the next discharge.

To this end, the energy recovery device 50 includes a positive half sustain voltage source (+ Vs / 2) for supplying a positive sustain voltage (+ Vs) necessary for sustain discharge; An eleventh switch S11 and a thirteenth switch S13 connected in parallel between the positive 1/2 sustain voltage source (+ Vs / 2) and the eleventh inductor L11; Eleventh and twelfth diodes D11 and D12 connected between the eleventh switch S11 and the thirteenth switch S13; A twelfth switch S12 and a seventeenth switch S17 connected in parallel between the eleventh inductor L11 and the panel capacitor Cp; A thirteenth diode D13 connected between the twelfth switch S12 and the eleventh switch S11, and the charging first capacitor Ca connected between the eleventh node n11 and the twelfth node n12. It is provided.

In addition, the energy recovery device 50 includes a negative 1/2 sustain voltage source (-Vs / 2) for supplying a negative sustain voltage (-Vs) necessary for sustain discharge; A fourteenth switch S14 and a sixteenth switch S16 connected in parallel between the negative 1/2 sustain voltage source (-Vs / 2) and the twelfth inductor L12; 14th and 15th diodes D14 and D15 connected between the fourteenth switch S14 and the sixteenth switch S16; A fifteenth switch S15 and a seventeenth switch S17 connected in parallel between the twelfth inductor L12 and the panel capacitor Cp; The sixteenth diode D16 connected between the fifteenth switch S15 and the sixteenth switch S16, and the charging second capacitor Cb connected between the thirteenth node n13 and the fourteenth node n14. It is provided.

The twelfth and fifteenth switches S12 and S15 are commonly tied and connected to the panel capacitor Cp. The panel capacitor Cp equivalently represents the capacitance value formed in the discharge cell. The eleventh to sixteenth diodes D11 to D16 serve to form a current path only in a predetermined direction.

The eleventh switch S11 is turned on when the panel capacitor Cp is charged with the positive voltage. The thirteenth switch S13 is turned on when the positive voltage charged in the panel capacitor Cp is discharged.

The charging first capacitor Ca receives a voltage value from the positive half sustain voltage source (+ Vs / 2) and charges the positive sustain voltage (+ Vs) by the back voltage circuit. The positive sustain voltage (+ Vs) charged in the charging first capacitor Ca is supplied to the panel capacitor Cp. On the other hand, the thirteenth diode D13 prevents the positive voltage applied to the twelfth node n12 from being supplied to the eleventh node n11.

The twelfth switch S12 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 dropping below the sustain voltage (+ Vs).

The sixteenth switch S16 is turned on when a negative voltage is charged in the panel capacitor Cp. The fourteenth switch S14 is turned on when the negative voltage charged in the panel capacitor Cp is discharged.

The charging second capacitor Cb receives a voltage value from the negative 1/2 sustain voltage source (-Vs / 2) and charges the negative sustain voltage (-Vs) by the back voltage circuit. The negative sustain voltage (-Vs) charged in the charging second capacitor Cb is supplied to the panel capacitor Cp. Meanwhile, the sixteenth diode D16 prevents the negative voltage applied to the fourteenth node n14 from being supplied to the thirteenth node n13.

The fifteenth switch S15 supplies the negative sustain voltage (-Vs) charged in the charging second capacitor Cb to the panel capacitor Cp to supply the negative sustain voltage (V) supplied to the panel capacitor Cp. -Vs) prevents the voltage from rising above the sustain voltage (-Vs).

The seventeenth switch S17 is turned on when the ground potential GND is supplied to the panel capacitor Cp.

The eleventh and twelfth inductors L11 and L12 form a resonance circuit with the panel capacitor Cp. Here, the switches S11 to S17 are implemented as semiconductor switch elements such as MOS FETs, IGBTs, and BJTs.

The operation of the energy recovery apparatus according to the embodiment of the present invention as described above will be described in detail with reference to FIG. In FIG. 6, Vcp represents the charge / discharge voltage of the panel capacitor Cp. 6 illustrates a voltage value supplied to the panel capacitor Cp according to the switching operation.

Referring to FIG. 6, the energy recovery apparatus according to the embodiment of the present invention uses the LC resonant circuit in the eighth period T8 for charging the first capacitor Ca for charging, and applies the positive voltage to the panel capacitor Cp. Discharging the positive voltage charged in the panel capacitor (Cp), the second period (T2) for supplying the positive sustain voltage (+ Vs) to the panel capacitor (Cp) A third period T3 for charging, a fourth period T4 for charging the second charging capacitor Cb, and a fifth period T5 for charging the panel capacitor Cp with a negative voltage using an LC resonant circuit. ), The sixth period T6 for supplying the negative sustain voltage (-Vs) to the panel capacitor Cp, and the seventh period T7 for discharging the negative voltage charged in the panel capacitor Cp. Driven.

First, in the eighth period T8, the seventeenth switch S17 is turned on. When the seventeenth switch S17 is turned on, the positive 1/2 sustain voltage source (+ Vs / 2), the thirteenth diode D13, the first capacitor Ca for charging, the eleventh diode D11, and the eleventh A current path is formed that leads to the inductor L11, the seventeenth switch S17, and the ground potential GND. At this time, the first capacitor Ca for charging is charged with a positive 1/2 sustain voltage (+ Vs / 2). That is, when the seventeenth switch S17 is turned on, since the eleventh node n11 is connected to the base voltage source GND, the positive half sustain voltage (+ Vs / 2) supplied to the twelfth node n12 is provided. ) Is charged in the charging first capacitor Ca.

The eleventh switch S11 is turned on in the first period T1. At this time, the seventeenth switch S17 is turned off. When the eleventh switch S11 is turned on, the positive half sustain voltage (+ Vs / 2) is supplied to the panel capacitor Cp via the eleventh diode D11 and the eleventh inductor L11. At this time, since the eleventh inductor L11 and the panel capacitor Cp form a resonant circuit, the panel capacitor Cp is charged with the positive sustain voltage (+ Vs / 2). In addition, during the first period T1, the positive 1/2 sustain voltage (+ Vs / 2) is maintained at the eleventh node n11. That is, the positive sustain voltage (+ Vs) raised by the LC resonant circuit by the eleventh diode D11 is not supplied to the eleventh node n11, and thus the eleventh node (T1) during the first period T1. n11 maintains a positive half sustain voltage (+ Vs / 2). The positive 1/2 sustain voltage (+ Vs / 2) supplied to the eleventh node n11 is supplied to the negative (−) terminal of the charging first capacitor Ca. Accordingly, the charging first capacitor Ca has a positive 1/2 sustain voltage (+ Vs / 2) charged therein and a positive 1/2 sustain voltage (+ Vs / 2 supplied from the eleventh node n11. ) And the positive sustain voltage (+ Vs) appears. That is, the voltage value of the positive sustain voltage (+ Vs) appears at the twelfth node n12. On the other hand, the thirteenth diode D13 prevents the positive voltage applied to the twelfth node n12 from being supplied to the eleventh node n11.

In the second period T2, the twelfth switch S12 is turned on. At this time, the eleventh switch S11 maintains a turn-on state. When the twelfth switch S12 is turned on, the positive sustain voltage + Vs applied to the twelfth node n12 is supplied to the panel capacitor Cp via the twelfth switch S12. Therefore, the panel capacitor Cp maintains the positive sustain voltage (+ Vs) during the second period T2. Since the eleventh switch S11 is turned on, the eleventh node n11 maintains a positive 1/2 sustain voltage (+ Vs / 2).

In the third period T3, the thirteenth switch S13 is turned on. At this time, the eleventh switch S11 and the twelfth switch S12 are turned off. When the thirteenth switch S13 is turned on, the positive voltage charged in the panel capacitor Cp is the eleventh inductor L11, the twelfth diode D12, the thirteenth switch S13, and the thirteenth diode D13. It is supplied to the charging first capacitor (Ca) via. Accordingly, the positive voltage charged in the panel capacitor Cp is discharged, and the charging first capacitor Ca is charged by the positive voltage discharged in the panel capacitor Cp.

In the fourth period T4, the seventeenth switch S17 is turned on. When the seventeenth switch S17 is turned on, the negative 1/2 sustain voltage source (-Vs / 2), the sixteenth diode D16, the charging second capacitor Cb, the fifteenth diode D15, and the twelfth A current path is formed that leads to the inductor L12, the seventeenth switch S17, and the ground potential GND. At this time, the charging second capacitor Cb is charged with the negative 1/2 sustain voltage (-Vs / 2). That is, when the seventeenth switch S17 is turned on, since the thirteenth node n13 is connected to the ground voltage source GND, the negative 1/2 sustain voltage (-Vs / 2) supplied to the fourteenth node n14 is provided. ) Is charged in the charging second capacitor Cb.

In the fifth period T5, the sixteenth switch S16 is turned on. At this time, the seventeenth switch S17 is turned off. When the sixteenth switch S16 is turned on, the negative half sustain voltage (−Vs / 2) is supplied to the panel capacitor Cp via the fifteenth diode D15 and the twelfth inductor L12. At this time, since the twelfth inductor L12 and the panel capacitor Cp form a resonant circuit, the panel capacitor Cp is charged with the negative sustain voltage (-Vs / 2). In addition, during the fifth period T1, the negative 1/2 sustain voltage (−Vs / 2) is maintained at the thirteenth node n13. That is, the negative sustain voltage (-Vs) dropped by the LC resonant circuit by the fifteenth diode D15 is not supplied to the thirteenth node n13, and accordingly, the thirteenth node (for the fifth period T5). n13) maintains a negative 1/2 sustain voltage (-Vs / 2). The negative 1/2 sustain voltage (-Vs / 2) supplied to the thirteenth node n13 is supplied to the positive (+) terminal of the charging second capacitor Ca. Accordingly, the charging second capacitor Cb has the negative 1/2 sustain voltage (-Vs / 2) charged to it and the negative 1/2 sustain voltage (-Vs / 2) supplied from the thirteenth node n13. ) Together with the negative sustain voltage (-Vs). That is, the voltage value of the negative sustain voltage (-Vs) appears at the fourteenth node n14. Meanwhile, the sixteenth diode D16 prevents the positive voltage applied to the fourteenth node n14 from being supplied to the thirteenth node n13.

In a sixth period T6, the fifteenth switch S15 is turned on. At this time, the sixteenth switch S16 maintains a turn-on state. When the fifteenth switch S15 is turned on, the negative sustain voltage −Vs applied to the fourteenth node n14 is supplied to the panel capacitor Cp via the fifteenth switch S15. Therefore, the panel capacitor Cp maintains the negative sustain voltage (-Vs) during the sixth period T6. Since the sixteenth switch S16 is turned on, the thirteenth node n13 maintains the negative 1/2 sustain voltage (−Vs / 2).

In the seventh period T7, the fourteenth switch S14 is turned on. At this time, the sixteenth switch S16 and the fifteenth switch S15 are turned off. When the fourteenth switch S14 is turned on, the negative voltage charged in the panel capacitor Cp is the twelfth inductor L12, the fourteenth diode D14, the fourteenth switch S14, and the sixteenth diode D16. It is supplied to the charging second capacitor (Cb) via. Therefore, the negative voltage charged in the panel capacitor Cp is discharged, and the charging second capacitor Cb is charged by the negative voltage discharged in the panel capacitor Cp. In fact, the energy recovery apparatus according to an embodiment of the present invention alternately supplies positive and negative sustain voltages, that is, positive and negative sustain pulses, to the panel capacitor Cp while repeating the processes of T1 to T8. Done.

Such an energy recovery apparatus according to an embodiment of the present invention can be driven using a voltage source 1/2 lower than the conventional energy recovery apparatus shown in FIG. 2, thereby reducing the power consumption. . In addition, the present invention lowers the breakdown voltage of the switch elements from twice the sustain voltage (2Vs) to the sustain voltage (Vs) by lowering the sustain voltage (Vs) by 1/2 compared to the conventional energy recovery circuit, thereby reducing the switch elements. The cost can be reduced by configuring the devices

In addition, the energy recovery apparatus according to the embodiment of the present invention, as shown in Fig. 7, the scan electrode (Y) is provided with an AC sustain pulse obtained by periodically repeating the operation process for the period (T1) to (T8) described above Supply. Therefore, the sustain electrode Z is only connected to the base voltage source through a heat sink (not shown) or a frame because a separate driving circuit is not required. Accordingly, the AC driving pulse is supplied to the panel capacitor Cp as shown in FIG. 7.

As described above, since the driving apparatus of the plasma display panel according to the embodiment of the present invention uses a 1/2 sustain voltage source to supply the sustain voltage to the panel, power consumption can be reduced. In addition, by using a positive half sustain voltage source and a negative half sustain voltage source provided on one printed circuit board, the positive sustain pulse and the negative sustain pulse are simultaneously generated, and the generated AC sustain pulse is used as the sustain electrode pair. The reference voltage is supplied to any one of them and the other 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, 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. 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 view showing a conventional energy recovery device provided for recovering a sustain discharge voltage.

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 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>

Y: scan electrode Z: sustain electrode

X: address electrode 12Y, 12Z: transparent electrode

13Y, 13Z: metal bus electrode 10: upper substrate

14,22 dielectric layer 16: protective film

18: lower substrate 24: bulkhead

26: phosphor layer 30, 32, 50: energy recovery device

Claims (15)

Alternately formed scanning electrodes and sustain electrodes; A first capacitor and an inductor for forming a resonant circuit and a panel capacitor equivalently formed in a discharge cell of the plasma display panel to supply a sustain pulse having a positive sustain voltage connected to any one of the scan electrode and the sustain electrode. A first energy recovery circuit, And a second inductor connected to any one of the scan electrode and the sustain electrode to which the first energy recovery circuit is connected to form a resonance circuit with the panel capacitor to alternately supply a sustain pulse having a negative sustain voltage. And a second energy recovery circuit. The method of claim 1, And a ground voltage source is connected to any one of the scan electrode and the sustain electrode to which the first energy recovery circuit is connected. The method of claim 1, The first energy recovery circuit is A positive half sustain voltage source having half the voltage of the positive sustain voltage, And a back voltage circuit for generating the positive sustain voltage using the voltage of the positive 1/2 sustain voltage source. The method of claim 3, wherein The back pressure circuit A charging capacitor for charging the voltage of the positive 1/2 sustain voltage source; A first diode connected between the charging capacitor and the positive 1/2 sustain voltage source to supply a voltage of the positive 1/2 sustain voltage source to the charging capacitor; And a first switch disposed between the first diode and the charging capacitor and configured to form a closed circuit with the charging capacitor and the first diode. The method of claim 4, wherein After the charging capacitor is charged with the voltage of the positive 1/2 sustain voltage source, the first switch is turned on to supply the voltage of the positive 1/2 sustain voltage source to the negative terminal of the charging capacitor. The positive sustain voltage is generated by the driving device of the plasma display panel. The method of claim 3, wherein When the voltage of the positive 1/2 sustain voltage source is supplied to the panel capacitor, the panel capacitor is supplied with the positive sustain voltage due to resonance of the first inductor and the panel capacitor. And the positive sustain voltage is supplied from the back voltage circuit for a predetermined period after the positive sustain voltage is supplied to the panel capacitor. The method of claim 4, wherein A second diode installed between the first switch and the first inductor to prevent reverse current; A second switch connected between the common terminal of the second diode and the first inductor and the positive 1/2 sustain voltage source; A third diode connected between the second switch and the first inductor to prevent reverse current; A third switch and a fourth switch connected in parallel between the first inductor and the panel capacitor, The third switch is turned on when the positive sustain voltage is supplied from the back voltage circuit to the panel capacitor, And the fourth switch is turned on when the fourth switch is connected to a ground voltage source to supply a ground potential to the panel capacitance. The method of claim 7, wherein And a positive voltage is charged in the charging capacitor when the fourth switch is turned on. The method of claim 1, The second energy recovery circuit A negative 1/2 sustain voltage source having a voltage of half of the negative sustain voltage; And a back voltage circuit for generating the negative sustain voltage using the voltage of the negative 1/2 sustain voltage source. The method of claim 9, The back pressure circuit A charging capacitor for charging the voltage of the negative 1/2 sustain voltage source; A first diode connected between the charging capacitor and the negative 1/2 sustain voltage source to supply a voltage of the negative 1/2 sustain voltage source to the charging capacitor; And a first switch disposed between the first diode and the charging capacitor and configured to form a closed circuit with the charging capacitor and the first diode. The method of claim 10, After the charging capacitor is charged with the voltage of the negative 1/2 sustain voltage source, the first switch is turned on to supply the voltage of the negative 1/2 sustain voltage source to the positive terminal of the charging capacitor. Wherein the negative sustain voltage is generated. The method of claim 9, When the voltage of the negative 1/2 sustain voltage source is supplied to the panel capacitor, the panel capacitor is supplied with the negative sustain voltage by resonance of the second inductor and the panel capacitor. And the negative sustain voltage is supplied from the back voltage circuit for a predetermined period after the negative sustain voltage is supplied to the panel capacitor. The method of claim 10, A second diode disposed between the first switch and the second inductor to prevent reverse current; A second switch connected between the common terminal of the second diode and the second inductor and the negative 1/2 sustain voltage source; A third diode connected between the second switch and the second inductor to prevent reverse current; A third switch and a fourth switch connected in parallel between the second inductor and the panel capacitor, The third switch is turned on when the negative sustain voltage is supplied from the back voltage circuit to the panel capacitor, And the fourth switch is turned on when the fourth switch is connected to a ground voltage source to supply a ground potential to the panel capacitance. The method of claim 13, And a negative voltage is charged in the charging capacitor when the fourth switch is turned on. The method of claim 1, And the first energy recovery circuit and the second energy recovery circuit are provided on a single board.