KR100539165B1 - Apparatus For Driving Plasma Display Panel Including Energy Recovery Circuit Part - Google Patents

Abstract

The present invention relates to a driving apparatus of a plasma display panel including an energy recovery circuit. The present invention provides an energy recovery circuit unit for recovering energy supplied to the plasma display panel and applying a sustain voltage, wherein the energy recovery circuit unit is an energy supply / recovery unit for supplying or recovering energy to the plasma display panel through charge and discharge, and a plasma display. A sustain voltage supply unit supplying a sustain voltage to the panel, a first switch turned on to charge energy in the plasma display panel, a third switch turned on to supply a sustain voltage in a state where energy is charged in the plasma display panel, and a sustain voltage A blocking portion separating the supply portion and the energy supply / recovery portion, a resonant inductor for returning energy to the energy supply / recovery portion, a second switch turned on to generate counter electromotive force, and discharging the energy to ground level It characterized in that it comprises a fourth switch that is turned on it.

Description

Apparatus For Driving Plasma Display Panel Including Energy Recovery Circuit Part}

The present invention relates to a driving apparatus for a plasma display panel, and more particularly, to a driving apparatus for a plasma display panel including an energy recovery circuit.

1 is a structural diagram of a typical AC surface discharge plasma display panel. As shown in FIG. 1, a typical AC type surface discharge plasma display panel includes a front substrate 122 and a rear substrate 124 made of transparent glass facing each other in parallel with an interval of 100 to 200 μm. At this time, the partition wall 126 is formed in parallel on the rear substrate 124 through a thick film printing technique in order to maintain a distance from the front substrate 122. The distance between these partitions 126 is 400 µm, and the width of each partition 126 is 50 µm.

In addition, a column Xj (j = 1, 2, ..., m) of an X electrode made of aluminum (Al) or an aluminum alloy between adjacent partitions 126 and 126 has a thickness of 100 nm to perform an addressing function. It is formed parallel to the partition wall. The light emitting layer 136 is formed while the R, G, and B phosphor films cover each X electrode with a thickness of 10 to 30 µm.

On the other hand, the row electrodes Yi and Zi (i = 1, 2, ..., n) of the Y electrode and the Z electrode are formed perpendicular to the X electrode on the surface of the front substrate 122 facing the rear substrate 124. The Y electrode and the Z electrode extend in parallel to each other by a thickness of approximately several hundred nm by deposition of ITO or tin oxide (SnO), and the row electrode Yi and Zi adjacent to each other form a pair of row electrode pairs Yi, Zi).

Further, in each of the row electrodes Yi and Zi, metal bus electrodes? I and? I narrower than the widths of the row electrodes Yi and Zi are formed in close contact with the row electrodes Yi and Zi. These bus electrodes alpha i and beta i are complementary to the row electrodes Yi and Zi having low conductivity as auxiliary electrodes.

In order to protect the row electrodes Yi and Zi, the dielectric layer 130 is formed to a thickness of about 20 to 30 μm. In contact with the dielectric layer 130, an MgO layer 132 made of magnesium oxide (MgO) is laminated to a thickness of approximately several hundred nm.

 After the electrodes Xj, Yi, Zi, αi, βi, the dielectric layer 130 and the light emitting layer 136 are formed, the front substrate 122 and the back substrate 124 are sealed and exhaust of the discharge space 128 Then, moisture on the surface of the MgO layer 132 is removed by baking. Subsequently, inert mixed gas including 3 to 7% of NeXe gas is injected into the discharge space 128 at 400 to 600 torr.

The unit emission region is defined as one pixel cell P _{(i, j)} around the intersection with the Xj electrode intersecting the Yi, Zi electrode. In the pixel cell P _{(i, j),} when the wall voltage is formed by the addressing discharge between the Xj electrode and the Yi electrode, the phosphor 136 is excited by applying a sustain pulse between the Yi electrode and the Zi electrode to maintain the discharge. The light is emitted, and the light emission is controlled by selecting, holding and erasing the light emission discharge of the pixel cells P _{(i, j)} by applying a voltage between the Xj, Yi and Zi electrodes.

In this case, as shown in FIG. 2, the X electrode driver 210, the Y electrode driver 220, and the Z electrode driver 240 for driving the X electrode and the Y electrode in response to the image signal are connected to the plasma display panel. The discharge sustain voltage is applied to the Y electrode and the Z electrode to maintain the discharge of the plasma display panel.

High voltages of several hundred volts or more are required for such address discharge and sustain discharge. Accordingly, the energy recovery circuit 230 is additionally provided to minimize the driving power required for the address discharge and the sustain discharge.

3 is a circuit diagram of a conventional energy recovery circuit unit 230, and FIG. 4 is a waveform diagram of a voltage applied to the plasma display panel by the conventional energy recovery circuit unit. In this case, the capacitor C _P denotes the capacitance of the discharge cell of the plasma display panel, and the constant voltage source Vs is the sustain voltage.

The operation of the conventional energy recovery circuit portion is composed of four steps. In the first step, the first switch S1 is turned on, and the second to fourth switches S2, S3, and S4 are turned off. When the switch is operated in this way, the energy stored in the capacitor C _S is charged to the capacitor C _P of the plasma display panel through the resonant inductor L.

Thereafter, in the second step, the third switch S3 is turned on and the first, second and fourth switches S1, S2, and S4 are turned off. When the switch is operated in this way, the sustain voltage Vs is supplied to the capacitor C _P of the plasma display panel through the turned-on third switch.

In the third step, the second switch S2 is turned on and the first, third and fourth switches S1, S3, and S4 are turned off. When the switch is operated as described above, the energy of the capacitor C _P is discharged through the resonant inductor L. At this time, the counter diode generates a counter electromotive force greater than Vs and the first diode D1 is turned on. The energy stored in the capacitor C _P is recovered to the capacitor C _S.

Finally, in the fourth step, the fourth switch S4 is turned on and the first to third switches S1, S2, and S3 are turned off. When the switch is operated in this way, the potential of the capacitor C _P drops to the ground level.

The capacitor of the conventional energy recovery circuit 220 that works as (C _S) is to carry out the two functions of the one is supplying energy to the capacitor (C _P), or is to recover energy from the capacitor (C _P) The second is to supply a sustain voltage to the capacitor C _P.

At this time, a very large capacitance is required for the capacitor C _S to supply a stable sustain voltage. On the other hand, the electrostatic capacity for the recovery of energy from the capacitor (C _S) capacitor (C _P) is just slightly larger than the electrostatic capacitance of the capacitor (C _P).

As such, when the capacitance of the capacitor C _S increases to supply a stable sustain voltage, the difference between the capacitance of the capacitor C _P increases, which not only lowers the energy recovery rate but also the optimum capacitor C _S. It is very difficult to set the capacitance.

The present invention is to solve the above problems, to provide a driving device of the plasma display panel including an energy recovery circuit that can not only set the optimum capacitor (C _S ) capacitance but also increase the energy recovery rate. will be.

In order to achieve the above object, the present invention provides an energy recovery circuit unit for recovering energy supplied to the plasma display panel and applying a sustain voltage, wherein the energy recovery circuit unit includes an energy supply / recovery unit, a sustain voltage supply unit, a first switch, and a second switch. And a switch, a third switch, a fourth switch, a resonant inductor, and a blocking portion.

The energy supply / recovery unit supplies or recovers energy to the plasma display panel through charge and discharge.

The sustain voltage supplier supplies a sustain voltage to the plasma display panel.

The first switch is turned on to charge the plasma display panel with energy.

The third switch is turned on to supply a sustain voltage in a state where energy is charged in the plasma display panel.

The blocking section separates the sustain voltage supply section and the energy supply / recovery section.

The resonant inductor allows energy to be recovered to the energy supply / recovery section.

The second switch is turned on to allow counter electromotive force to be generated.

The fourth switch is turned on to discharge energy to ground level.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a circuit diagram of an energy recovery circuit portion of the present invention, and FIG. 6 is a waveform diagram of voltage applied to the plasma display panel by the energy recovery circuit portion of the present invention.

In this case, reference numeral 510 denotes an energy supply / recovery unit including a capacitor C _S , and reference numeral 520 denotes a sustain voltage supply unit including a capacitor C _VS.

The energy recovery circuit part of the present invention adds a blocking part 530 to the conventional energy recovery circuit part to separate the voltage source Vs and the capacitor C _S so that the capacitor C _S performs only the energy recovery and supply function. . That is, in the blocking part 530 of the present invention, the anode terminal is connected to one end of the first switch S1 as the diode DB, and the cathode terminal is connected to the voltage source Vs to separate the voltage source Vs and the capacitor C _S.

The turn on / off order of the switches S1, S2, S3, and S4 of the energy recovery circuit unit included in the present invention is the same as the turn on / off order of the conventional energy recovery circuit unit described above.

First, in the first step, the first switch S1 is turned on, and the second to fourth switches S2, S3, and S4 are turned off. When the switch is operated in this way, the energy stored in the capacitor C _S is charged to the capacitor C _P of the plasma display panel through the resonant inductor L.

Thereafter, in the second step, the third switch S3 is turned on and the first, second and fourth switches S1, S2, and S4 are turned off. When the switch is operated in this way, the sustain voltage Vs is supplied to the capacitor C _P of the plasma display panel through the turned-on third switch, and the sustain voltage supplied at this time is the constant voltage source Vs formed by the capacitor C _VS. The sustain voltage by the capacitor C _VS does not affect the capacitor C _S because of the diode DB included in the blocking unit 530.

Therefore, the capacitor (C _S) is a capacitor (C _P) is a capacitor (C _P) that the capacitance does not supply a sustain voltage intended only supplying or recovering energy in the conventional energy recovery circuit, and is different from the plasma display panel according to the present invention; It is set slightly larger than the capacitance of, that is, can be set smaller than the capacitor (C _VS ), the energy recovery is made efficient.

In the third step, the second switch S2 is turned on and the first, third and fourth switches S1, S3, and S4 are turned off. When the switch is operated as described above, the energy of the capacitor C _P is discharged through the resonant inductor L. At this time, the counter diode generates a counter electromotive force greater than Vs and the first diode D1 is turned on. The energy stored in the capacitor C _P is recovered to the capacitor C _S.

Finally, in the fourth step, the fourth switch S4 is turned on and the first to third switches S1, S2, and S3 are turned off. When the switch is operated in this way, the potential of the capacitor C _P drops to the ground level.

As described above, the energy recovery circuit unit included in the embodiment of the present invention further includes a blocking unit 530 and a dedicated capacitor C _VS for supplying a sustain voltage to optimize the capacitance of the capacitor C _S. Can be.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the energy recovery circuit unit included in the embodiment of the present invention may further increase the energy recovery rate by further including a blocking unit and a dedicated capacitor for supplying a sustain voltage.

1 is a structural diagram of a typical AC surface discharge plasma display panel.

2 is a block diagram for driving a general plasma display panel.

3 is a circuit diagram of a conventional energy recovery circuit portion.

4 is a waveform diagram of a voltage applied to a plasma display panel by a conventional energy recovery circuit unit.

5 is a circuit diagram of an energy recovery circuit portion of the present invention.

6 is a waveform diagram of a voltage applied to the plasma display panel by the energy recovery circuit unit of the present invention.

Claims (5)

In the driving device of the plasma display panel having an energy recovery circuit for recovering the energy supplied to the plasma display panel and applying a sustain voltage, The energy recovery circuit unit, An energy supply / recovery unit supplying or recovering energy to the plasma display panel through charge and discharge; A sustain voltage supply unit supplying a sustain voltage to the plasma display panel; A first switch turned on to charge the energy to the plasma display panel; A third switch turned on to supply the sustain voltage in a state where the energy is charged in the plasma display panel; A blocking unit separating the sustain voltage supply unit and the energy supply / recovery unit; A resonant inductor for recovering the energy to the energy supply / recovery unit; A second switch turned on to cause the counter electromotive force to be generated; And And a fourth switch turned on to discharge the energy to the ground level. The method of claim 1, And said energy supply / recovery unit includes a capacitor for energy charging and discharging. The method of claim 1, And the sustain voltage supply unit includes a sustain voltage supply capacitor. The method of claim 1, And the blocking part includes a blocking diode having an anode end connected to the energy supply / recovery part and a cathode end connected to the sustain voltage supply part. The method of claim 2 or 3, And a capacitance of the energy charging / discharging capacitor is smaller than that of the sustain voltage supply capacitor.