KR100487811B1 - Method And Apparatus For Supplying Sustain Pulse In Plasma Display Panel - Google Patents

Abstract

The present invention relates to a sustain pulse supply apparatus and method for a plasma display panel to reduce manufacturing costs.

A sustain pulse supply apparatus for a plasma display panel according to an embodiment of the present invention includes a capacitive load that is equivalently formed between a scan electrode and a sustain electrode; A voltage charging unit for supplying a sustain voltage to the capacitive load to charge the sustain voltage; A voltage holding unit for supplying the sustain voltage so that stable discharge can be generated at the capacitive load charged with the sustain voltage connected to the capacitive load; A voltage relay unit connected between the voltage charging unit and the capacitive load to relay the sustain voltage.

Description

Sustain pulse supply device and method for plasma display panel {Method And Apparatus For Supplying Sustain Pulse In Plasma Display Panel}

The present invention relates to a sustain pulse supply apparatus and method for a plasma display panel, and more particularly, to a sustain pulse supply apparatus and method for a plasma display panel to reduce manufacturing costs.

Plasma Display Panels (hereinafter referred to as "PDPs") are characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view illustrating a discharge cell structure of a conventional plasma display panel.

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 the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed at one edge of the transparent electrode 13Y, 13Z).

The transparent electrodes 12Y and 12Y are usually formed on the upper substrate 10 by indium tin oxide (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 a stripe or lattice shape to prevent the ultraviolet rays and the 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. Inert mixed gas is injected into the discharge space 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 plurality of subfields are driven by being divided into reset periods, address periods, sustain periods, and erase periods.

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 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, in order to minimize the driving power required for the address discharge and the sustain discharge, the sustain pulse supply device of the PDP capable of energy recovery is used. The sustain pulse supply device of the PDP 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.

Fig. 2 is a diagram showing a sustain pulse supply device of a PDP formed on the scan electrode Y to recover the sustain discharge voltage. In practice, the sustain pulse supply of the PDP is symmetrically installed on the sustain electrode Z around the panel capacitor Cp.

Referring to FIG. 2, the sustain pulse supply apparatus of the conventional PDP has an inductor L connected between the panel capacitor Cp and the source capacitor Cs, and the source capacitor Cs and the inductor L in parallel. Connected first and third switches S1 and S3, diodes D5 and D6 provided between the first and third switches S1 and S3 and the inductor L, the inductor L and the panel Second and fourth switches S2 and S4 connected in parallel between the capacitor Cp are provided.

The panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z. FIG. The second switch S2 is connected to the reference 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.

To this end, the source capacitor Cs has a capacitance value capable of charging a voltage of Vs / 2 corresponding to half of the reference 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. The fifth and sixth diodes D5 and D6 prevent current from flowing in the reverse direction. In addition, the internal internal diodes D1 to D4 respectively installed in the first to fourth switches S1 to S4 also prevent the reverse current from flowing.

3 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 2 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 reference voltage source Vs is supplied to the panel capacitor Cp. That is, when the second switch S2 is turned on, the voltage value of the reference voltage source Vs is supplied to the panel capacitor Cp to prevent the voltage value of the panel capacitor Cp from falling below the reference voltage source Vs. Thus, sustain discharge is stably generated. Here, since the voltage of the panel capacitor Cp has risen to Vs in the period T1, the voltage value supplied from the outside during the period T2 can be minimized (that is, the power consumption can be reduced).

In the T3 period, the first switch S1 is turned off. In this case, the panel capacitor Cp maintains the voltage of the reference voltage source Vs. 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 scan electrode Y and the sustain electrode Z are obtained by periodically repeating the periods T1 to T6.

However, in order to install such a sustain pulse supply apparatus of the conventional PDP, a large manufacturing cost is generated. That is, since the inductor L used in the sustain pulse supply apparatus of the conventional PDP is an expensive element, there is a problem that the manufacturing cost increases.

Accordingly, it is an object of the present invention to provide a sustain pulse supply apparatus and method for a plasma display panel that can reduce manufacturing costs.

In order to achieve the above object, the sustain pulse supply apparatus of the plasma display panel according to an embodiment of the present invention includes a capacitive load equivalently formed between the scan electrode and the sustain electrode; A voltage charging unit for supplying a sustain voltage to the capacitive load to charge the sustain voltage; A voltage holding unit for supplying the sustain voltage so that stable discharge can be generated at the capacitive load charged with the sustain voltage connected to the capacitive load; A voltage relay unit connected between the voltage charging unit and the capacitive load to relay the sustain voltage.

In the sustain pulse supply device of the plasma display panel, the energy relay unit includes a magnetic coupling inductor in which at least two coils are magnetically coupled.

The magnetic coupling inductor in the sustain pulse supply of the plasma display panel is a first inductor connected to the voltage charging unit; And a second inductor connected in parallel to the capacitive load.

A sustain voltage source for supplying a sustain voltage in the sustain pulse supply device of the plasma display panel; First and second switches connected between a sustain voltage source and a ground voltage source to supply the sustain voltage in one direction of the first inductor; And third and fourth switches connected between the sustain voltage source and the base voltage source for supplying the sustain voltage in the other direction of the first inductor.

In the sustain pulse supply of the plasma display panel, the coils of the first and second inductors are wound in the same direction.

In the sustain pulse supply device of the plasma display panel, the sustain voltage is supplied in one direction of the first inductor, and then is induced in the other direction of the second inductor and supplied to the scan electrode of the capacitive load.

In the sustain pulse supply of the plasma display panel, the coils of the first and second inductors are wound in opposite directions.

In the sustain pulse supply device of the plasma display panel, the sustain voltage is supplied in one direction of the first inductor and then induced in one direction of the second inductor to be supplied to the scan electrode of the capacitive load.

A sustain voltage source for supplying a sustain voltage in the sustain pulse supply device of the plasma display panel; Fifth and sixth switches disposed between a sustain voltage source and a base voltage source and turned on when the sustain voltage is supplied to the scan electrode of the capacitive load; And a seventh and eighth switch provided between the sustain voltage source and the base voltage source to be turned on when the sustain voltage is supplied to the sustain electrode of the capacitive load.

A sustain pulse supply method of a plasma display panel according to an embodiment of the present invention includes a first step of supplying a sustain voltage to a first inductor of the magnetic coupling inductor; A second step of inducing the sustain voltage supplied to a first inductor to a second inductor of the magnetic coupling inductors; And a third step of charging the sustain voltage supplied by the first and second steps to a capacitive load equivalently formed between the scan electrode and the sustain electrode.

In the sustain pulse supply method of the plasma display panel, the coils of the first and second inductors are wound in the same direction.

In the sustain pulse supply method of the plasma display panel, the coils of the first and second inductors are wound in opposite directions.

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

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 15.

4 is a diagram illustrating a sustain pulse supply apparatus of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 4, the sustain pulse supply apparatus of the PDP according to the first embodiment of the present invention includes a panel capacitor Cp equivalently representing capacitance formed between the scan electrode Y and the sustain electrode Z. ; An energy charging unit 30 for charging energy (voltage and / or current) to the panel capacitor Cp; An energy holding part 32 for holding energy of the panel capacitor Cp; An energy relay unit 34 is provided to relay the energy of the energy charging unit 30 to the panel capacitor Cp.

The energy charging unit 30 is provided to be connected to the sustain voltage source Vs, the base voltage source GND, and the energy relay unit 34. The energy charging unit 30 includes first to fourth switches Q1 to Q4 to supply the sustain voltage Vs to the scan electrode Y and the sustain electrode Z of the panel capacitor Cp. At this time, the first and fourth switches Q1 and Q4 are provided between the sustain voltage source Vs and the ground voltage source GND. The second and third switches Q2 and Q3 are installed between the sustain voltage source Vs and the base voltage source GND and are connected to the first and fourth switches Q1 and Q4 in parallel. The first and second switches Q1 and Q2 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. The third and fourth switches Q3 and Q4 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. Here, the internal diodes D1 to D4 are installed in the first to fourth switches Q1 to Q4 to prevent reverse current.

The energy holding unit 32 is connected between the sustain voltage source and the ground voltage source. The energy holding unit 32 supplies the sustain voltage Vs to maintain the sustain voltage Vs charged to the panel capacitor Cp by the energy charging unit 30. For this purpose, the energy holding unit 32 has fifth to eighth switches Q5 to Q8. At this time, the fifth and eighth switches Q5 and Q8 are provided between the sustain voltage source Vs and the ground voltage source GND. The sixth and seventh switches Q6 and Q7 are provided between the sustain voltage source Vs and the base voltage source GND, and are connected to the fifth and eighth switches Q5 and Q8 in parallel. The fifth and sixth switches Q5 and Q6 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. The seventh and eighth switches Q7 and Q8 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. Here, the fifth to eighth switches Q5 to Q8 are provided with internal diodes D5 to D8 to prevent reverse current.

The energy relay unit 34 is installed between the panel capacitor Cp and the energy charging unit 30 to relay energy. To this end, the energy relay 34 includes a transformer. The transformer includes a first inductor L1 connected to the energy charging unit 30 and a second inductor L2 installed in parallel with the panel capacitor Cp. At this time, one terminal of the first inductor L1 is connected to the common terminal n1 of the first and fourth switches Q1 and Q4, and the other terminal of the first inductor L1 is connected to the second and third switches. It is connected to the common terminal n2 of (Q2, Q3). On the other hand, the coils of the first inductor L1 and the second inductor L2 are wound in the same direction. In addition, the winding ratios of the first inductor L1 and the second inductor L2 are experimentally set to facilitate energy transfer.

FIG. 5 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 4 and output waveforms of the panel capacitor.

Here, it is assumed that the scan electrode Y of the panel capacitor Cp is set to the positive polarity and the sustain electrode Z of the panel capacitor Cp is set to the negative polarity. In addition, the operation process is performed on the assumption that the ground voltage is supplied to the scan electrode Y of the panel capacitor Cp and the -Vs voltage value is charged to the sustain electrode Z of the panel capacitor Cp before the period T1. It will be described in detail.

In the T1 period, the first and second switches Q1 and Q2 are turned on. When the first and second switches Q1 and Q2 are turned on, the sustain voltage source Vs, the first switch Q1, the first inductor L1 and the second switch Q2 are shown in FIG. 6. Via the current path to the ground voltage source (GND) is formed. At this time, the Vs voltage supplied to the first inductor L1 is induced to the second inductor L2. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the voltage Vs induced by the second inductor L2 is supplied to the scan electrode Y of the panel capacitor Cp. . The -Vs voltage charged in the sustain electrode Z of the panel capacitor Cp is discharged along the current flow. Here, the voltage -Vs charged in the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the sustain electrode Z is charged with the Vs voltage. The T1 period is set until the voltage Vs is charged in the scan electrode Y of the panel capacitor Cp.

In the period T2, the fifth and sixth switches Q5 and Q6 are turned on. When the fifth and sixth switches Q5 and Q6 are turned on, the sustain voltage source Vs, the fifth switch Q5, the scan electrode Y of the panel capacitor Cp, and the sustain as shown in FIG. A current path leading to the ground voltage source GND is formed via the electrode Z and the sixth switch Q6. Through this current path, the Vs voltage is supplied to the scan electrode Y of the panel capacitor Cp. The voltage Vs supplied to the scan electrode Y of the panel capacitor Cp during the T2 period causes the sustain sustain discharge to occur while maintaining the voltage of the scan electrode Y of the panel capacitor Cp at the voltage Vs.

In the period T3, the third and fourth switches Q3 and Q4 are turned on. When the third and fourth switches Q3 and Q4 are turned on, the sustain voltage source Vs, the third switch Q3, the first inductor L1 and the fourth switch Q4 are shown in FIG. 8. Via the current path leading to the ground voltage source (GND) is formed. At this time, the -Vs voltage supplied to the first inductor L1 is induced to the second inductor L2. Here, since the coils of the first inductor L1 and the second inductor L2 are wound in the same direction, the -Vs voltage induced by the second inductor L2 is supplied to the sustain electrode Z of the panel capacitor Cp. do. The voltage Vs charged in the scan electrode Y of the panel capacitor Cp is discharged along the current flow. On the other hand, the T3 period is set until the -Vs voltage is charged to the sustain electrode Z of the panel capacitor Cp.

In the T4 period, the seventh and eighth switches Q7 and Q8 are turned on. When the seventh and eighth switches Q7 and Q8 are turned on, as shown in FIG. 9, the sustain voltage source Vs, the seventh switch Q7, the sustain electrode Z of the panel capacitor Cp, and the scan are shown. The current path leading to the ground voltage source GND is formed via the electrode Y and the eighth switch Q8. Through this current path, the -Vs voltage value is supplied to the sustain electrode Z of the panel capacitor Cp. The -Vs voltage value supplied to the sustain electrode Z of the panel capacitor Cp during the T4 period allows the sustain sustain discharge to occur while maintaining the voltage of the sustain electrode Z of the panel capacitor Cp at the -Vs voltage value. . Here, the voltage -Vs supplied to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the voltage of Vs is supplied to the sustain electrode Z.) In practice, the sustain pulse supply apparatus of the PDP according to the present invention provided on both sides of the panel capacitor Cp supplies the AC driving pulses to the panel capacitor Cp while alternately repeating the periods T1 to T4.

The sustain pulse supply apparatus of the PDP according to the first embodiment of the present invention can reduce the manufacturing cost by using a transformer having a low installation cost.

FIG. 10 is a diagram illustrating a sustain pulse supply device of a plasma display panel according to a second embodiment of the present invention.

Referring to FIG. 10, the sustain pulse supply apparatus of the PDP according to the second embodiment of the present invention includes a panel capacitor Cp equivalently representing the capacitance formed between the scan electrode Y and the sustain electrode Z. ; An energy charging unit 130 for charging energy (voltage and / or current) to the panel capacitor Cp; An energy holding unit 132 for holding energy of the panel capacitor Cp; An energy relay unit 134 is provided to relay the energy of the energy charging unit 130 to the panel capacitor Cp.

The energy charging unit 130 is installed to be connected to the sustain voltage source Vs, the base voltage source GND, and the energy relay unit 134. The energy charging unit 130 includes eleventh through fourteenth switches Q11 through Q14 to supply the sustain voltage Vs to the scan electrode Y and the sustain electrode Z of the panel capacitor Cp. At this time, the eleventh and fourteenth switches Q11 and Q14 are provided between the sustain voltage source Vs and the ground voltage source GND. The twelfth and thirteenth switches Q12 and Q13 are installed between the sustain voltage source Vs and the base voltage source GND, and are connected to the eleventh and fourteenth switches Q11 and Q14 in parallel. The eleventh and twelfth switches Q11 and Q12 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. The thirteenth and fourteenth switches Q13 and Q14 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. Here, the internal diodes D11 to D14 are installed in the eleventh to fourteenth switches Q11 to Q14 to prevent reverse current.

The energy holding unit 132 is connected between the sustain voltage source Vs and the ground voltage source GND. The energy holding unit 132 supplies the sustain voltage Vs to maintain the sustain voltage Vs charged to the panel capacitor Cp by the energy charging unit 130. To this end, the energy holding unit 132 includes the fifteenth to eighteenth switches Q15 to Q18. At this time, the fifteenth and eighteenth switches Q15 and Q18 are provided between the sustain voltage source Vs and the ground voltage source GND. The sixteenth and seventeenth switches Q16 and Q17 are provided between the sustain voltage source Vs and the base voltage source GND, and are connected to the fifteenth and eighteenth switches Q15 and Q18 in parallel. The fifteenth and sixteenth switches Q15 and Q16 are turned on when the sustain voltage Vs is supplied to the scan electrode Y of the panel capacitor Cp. The seventeenth and eighteenth switches Q17 and Q18 are turned on when the sustain voltage Vs is supplied to the sustain electrode Z of the panel capacitor Cp. Here, the internal diodes D15 to D18 are installed in the fifteenth to eighteenth switches Q15 to Q18 to prevent reverse current.

The energy relay unit 134 is installed between the panel capacitor Cp and the energy charging unit 130 to relay energy. To this end, the energy relay unit 134 includes a transformer. The transformer includes an eleventh inductor L11 connected to the energy charging unit 130 and a twelfth inductor L12 installed in parallel with the panel capacitor Cp. At this time, one terminal of the eleventh inductor L11 is connected to the common terminal n11 of the eleventh and fourteenth switches Q11 and Q14, and the other terminal of the eleventh inductor L11 is connected to the twelfth and thirteenth switches. It is connected to the common terminal n12 of (Q12, Q13). On the other hand, the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions. The winding ratios of the eleventh inductor L11 and the twelfth inductor L12 are experimentally set to facilitate energy transfer.

FIG. 11 is a timing diagram and waveform diagrams illustrating on / off timing of the switches illustrated in FIG. 10 and an output waveform of the panel capacitor.

Here, it is assumed that the scan electrode Y of the panel capacitor Cp is set to the positive polarity and the sustain electrode Z of the panel capacitor Cp is set to the negative polarity. In addition, the operation process is performed on the assumption that the ground voltage is supplied to the scan electrode Y of the panel capacitor Cp and the -Vs voltage value is charged to the sustain electrode Z of the panel capacitor Cp before the period T1. It will be described in detail.

In the T1 period, the thirteenth and fourteenth switches Q13 and Q14 are turned on. When the thirteenth and fourteenth switches Q13 and Q14 are turned on, the sustain voltage source Vs, the thirteenth switch Q13, the eleventh inductor L11, and the fourteenth switch Q14, as shown in FIG. Via the current path to the ground voltage source (GND) is formed. At this time, the Vs voltage supplied to the eleventh inductor L11 is induced to the twelfth inductor L12. Since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the voltage Vs induced by the twelfth inductor L12 is supplied to the scan electrode Y of the panel capacitor Cp. . The -Vs voltage charged in the sustain electrode Z of the panel capacitor Cp is discharged along the current flow. Here, the voltage -Vs charged in the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the sustain electrode Z is charged with the Vs voltage. The T1 period is set until the voltage Vs is charged in the scan electrode Y of the panel capacitor Cp.

In the T2 period, the fifteenth and sixteenth switches Q15 and Q16 are turned on. When the fifteenth and sixteenth switches Q15 and Q16 are turned on, as shown in FIG. 13, the sustain voltage source Vs, the fifteenth switch Q15, and the scan electrode Y of the panel capacitor Cp are maintained. A current path leading to the ground voltage source GND is formed via the electrode Z and the sixteenth switch Q16. Through this current path, the Vs voltage value is supplied to the scan electrode Y of the panel capacitor Cp. The Vs voltage value supplied to the scan electrode Y of the panel capacitor Cp during the T2 period causes the sustain sustain discharge to occur while maintaining the voltage of the scan electrode Y of the panel capacitor Cp at the Vs voltage value.

In the T3 period, the eleventh and twelfth switches Q11 and Q12 are turned on. When the eleventh and twelfth switches Q11 and Q12 are turned on, the sustain voltage source Vs, the eleventh switch Q11, the eleventh inductor L11, and the twelfth switch Q12, as shown in FIG. Via the current path leading to the ground voltage source (GND) is formed. At this time, the -Vs voltage supplied to the eleventh inductor L11 is induced to the twelfth inductor L12. Since the coils of the eleventh inductor L11 and the twelfth inductor L12 are wound in opposite directions, the -Vs voltage induced by the twelfth inductor L12 is supplied to the sustain electrode Z of the panel capacitor Cp. do. The voltage Vs charged in the scan electrode Y of the panel capacitor Cp is discharged along the current flow. On the other hand, the T3 period is set until the -Vs voltage is charged to the sustain electrode Z of the panel capacitor Cp.

In the T4 period, the seventeenth and eighteenth switches Q17 and Q18 are turned on. When the seventeenth and eighteenth switches Q17 and Q18 are turned on, as shown in FIG. 15, the sustain voltage source Vs, the seventeenth switch Q17, the sustain electrode Z of the panel capacitor Cp, and the scan are shown. The current path leading to the ground voltage source GND is formed via the electrode Y and the eighteenth switch Q18. Through this current path, the -Vs voltage value is supplied to the sustain electrode Z of the panel capacitor Cp. The -Vs voltage value supplied to the sustain electrode Z of the panel capacitor Cp during the T4 period allows the sustain sustain discharge to occur while maintaining the voltage of the sustain electrode Z of the panel capacitor Cp at the -Vs voltage value. . Here, the voltage of -Vs supplied to the sustain electrode Z of the panel capacitor Cp is a relative voltage based on the scan electrode Y. (In fact, the voltage of Vs is supplied to the sustain electrode Z.) In reality, the sustain pulse supply apparatus of the PDP according to the present invention provided on both sides of the panel capacitor Cp supplies the AC drive pulses to the panel capacitor Cp while alternately repeating the periods of T1 to T4.

The sustain pulse supply apparatus of the PDP according to the second embodiment of the present invention can reduce the manufacturing cost by using a transformer having a low installation cost.

As described above, the sustain pulse supply apparatus and method of the plasma display panel according to the embodiments of the present invention can reduce the manufacturing cost because the transformer installed in parallel to the panel capacitor relays the energy.

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 discharge cell structure of a conventional three-electrode AC surface discharge type plasma display panel.

2 is a circuit diagram showing a conventional energy recovery device.

FIG. 3 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device shown in FIG. 2.

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

FIG. 5 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device illustrated in FIG. 4.

FIG. 6 is a circuit diagram showing an on / off state and a current path of a switch element in the T1 period shown in FIG.

FIG. 7 is a circuit diagram showing an on / off state and a current path of a switch element in the period T2 shown in FIG.

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

9 is a circuit diagram showing an on / off state and a current path of a switch element in the period T4 shown in FIG.

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

FIG. 11 is a waveform diagram illustrating on-off timing of switches included in the energy recovery device illustrated in FIG. 10.

FIG. 12 is a circuit diagram showing an on / off state and a current path of a switch element in the T1 period shown in FIG.

FIG. 13 is a circuit diagram showing an on / off state and a current path of a switch element in the period T2 shown in FIG.

FIG. 14 is a circuit diagram showing an on / off state and a current path of a switch element in the period T3 shown in FIG.

FIG. 15 is a circuit diagram showing an on / off state and a current path of a switch element in the period T4 shown in FIG.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, 12Z: transparent electrode

13Y, 13Z: bus electrode 14, 22: dielectric layer

16: protective film 18: lower substrate

24: partition 26: phosphor layer

30,130: energy charging unit 32,132: energy maintenance unit

34,134: energy relay

Claims (12)

A capacitive load equivalently formed between the scan electrode and the sustain electrode, A voltage charging unit for supplying a sustain voltage to the capacitive load to charge the sustain voltage; A voltage holding unit connected to the capacitive load to supply the sustain voltage so that stable discharge can be generated at the capacitive load charged with the sustain voltage; And a voltage relay unit connected between the voltage charging unit and the capacitive load to relay the sustain voltage. The method of claim 1, And the energy relay unit includes a magnetic coupling inductor in which at least two coils are magnetically coupled to each other. The method of claim 2, The magnetic coupling inductor A first inductor connected to the voltage charger; And a second inductor connected in parallel to said capacitive load. The method of claim 3, wherein The voltage charging unit A sustain voltage source for supplying the sustain voltage; First and second switches connected between the sustain voltage source and a base voltage source to supply the sustain voltage in one direction of the first inductor; And a third and a fourth switch connected between the sustain voltage source and the base voltage source for supplying the sustain voltage in the other direction of the first inductor. The method of claim 3, wherein And the coils of the first and second inductors are wound in the same direction. The method of claim 5, wherein And the sustain voltage is supplied in one direction of the first inductor, and then is induced in the other direction of the second inductor and supplied to the scan electrode of the capacitive load. The method of claim 3, wherein And the coils of the first and second inductors are wound in opposite directions. The method of claim 7, wherein And the sustain voltage is supplied in one direction of the first inductor, and then is induced in one direction of the second inductor and supplied to the scan electrode of the capacitive load. The method of claim 1, The voltage holding unit A sustain voltage source for supplying the sustain voltage; Fifth and sixth switches disposed between the sustain voltage source and the base voltage source and turned on when the sustain voltage is supplied to the scan electrode of the capacitive load; And a seventh and eighth switch disposed between the sustain voltage source and the base voltage source and turned on when the sustain voltage is supplied to the sustain electrode of the capacitive load. . In the sustain pulse supply method of the plasma display panel comprising a sustain voltage source for supplying a sustain voltage so that a stable sustain discharge can occur, Supplying the sustain voltage to a first inductor of a magnetic coupling inductor; A second step of inducing the sustain voltage supplied to the first inductor to a second inductor of the magnetic coupling inductors; And a third step of charging the sustain voltage supplied by the first and second steps to a capacitive load equivalently formed between a scan electrode and a sustain electrode. Way. The method of claim 10, And the coils of the first and second inductors are wound in the same direction. The method of claim 10, And the coils of the first and second inductors are wound in opposite directions.