KR100658331B1 - Apparatus for Driving Plasma Display Panel and Method thereof - Google Patents

Abstract

The present invention relates to a driving apparatus and a driving method of a plasma display panel in which a circuit is composed of elements and components driven at low ratings by driving a voltage of a setup section and, in particular, a sustain section, to reduce the cost and improve the efficiency of the circuit. The present invention provides a driving device of a plasma display panel which applies an alternating sustain voltage to the Y electrode and the Z electrode of a panel in order to maintain the discharge of a selected cell in a sustain period, wherein the driving device of the plasma display panel is the sustain. In the interval, the positive and negative sustain voltages (+ Vs / 2) and the negative sustain voltage (-Vs / 2) having voltage levels of opposite polarities and opposite voltages are alternately applied to the Y electrode of the panel. The sustain voltage (+ Vs / 2) and the negative sustain voltage (-Vs / 2) are alternately applied to the Z electrode in the reverse order of alternating application to the Y electrode to maintain the discharge.

Plasma Display Panel, Setup, Sustain, Voltage, Rating, Element, Voltage Difference, Vs / 2

Description

Apparatus for Driving Plasma Display Panel and Method

1 is a circuit diagram of a driving apparatus of a conventional plasma display panel.

2 is a drive waveform diagram showing an operating state of a conventional drive device for a plasma display panel.

3 is a circuit diagram showing a driving device of a plasma display panel according to the present invention;

4 and 5 are driving waveform diagrams showing an operating state of the driving apparatus of the plasma display panel according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: first energy supply / recovery unit 110: setup supply unit

120: first switching unit 130: set-down supply unit

140: negative scan voltage supply unit 150: scan reference voltage supply unit

160: panel drive unit 170: second switching unit

180: third switching unit 190: second energy supply / recovery unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device of a plasma display panel, and more particularly, to a driving device and a driving method of a plasma display panel having reduced cost and improved circuit efficiency by driving a sustain section at a lower rating than before.

As is well known, a plasma display panel (hereinafter referred to as "PDP") refers to an apparatus for displaying an image such as text or graphics by emitting phosphors by ultraviolet rays generated when the inert gas is discharged.

PDP is divided into DC type and AC type according to the type of driving voltage waveform applied and the structure of discharge cell. Especially in AC PDP, the electrode is covered with a dielectric layer, and the current is limited by the formation of natural capacitance component. Since the electrode is protected from impact, it has a long life compared to the DC type, and is widely used.

Such AC PDP is generally applied to ADS (Address Display Separated) driving method.

The ADS driving method is divided into a reset section for initializing the full screen, an address section for selecting a cell, and a sustain section for maintaining discharge of the selected cell.

1 is a circuit diagram of a driving apparatus of a conventional plasma display panel, and FIG. 2 is a driving waveform diagram showing an operation of the driving apparatus of a conventional plasma display panel.

As shown, the conventional PDP driving apparatus includes an energy supply / recovery unit 10, a setup supply unit 11, a switching unit 12, a set-down supply unit 13, a negative scan voltage supply unit 14, and a scan reference. The voltage supply part 15 and the panel drive part 16 are provided.

First, the sustain voltage Vs is supplied from the energy supply / recovery section 10. The sustain voltage Vs supplied from the energy supply / recovery unit 10 is scanned via the sixth switch Q6, the seventh switch Q7, and the second selector Q15 of the panel driver 16. Supplied as (Y). Thus, as shown in FIG. 2, the voltages of the scan electrodes Y are rapidly increased to Vs.

On the other hand, the fifth switch Q5 and the seventh switch Q7 are turned on during the setup period. Since the sustain voltage Vs is supplied to the lower end of the second capacitor C2, the second capacitor C2 supplies the voltage of Vs + Vsetup to the fifth switch Q5. The fifth switch Q5 supplies a voltage having a predetermined slope through the second capacitor C2 while the channel width is adjusted by the first variable resistor VR1 installed at the front end thereof. The voltage applied with the predetermined slope is supplied to the scan electrodes via the seventh switch Q7 and the second selector Q15 of the panel driver 16. As shown in FIG. 2, the rising ramp waveform Ramp-up is supplied to the scan electrodes Y through the above process.

After the rising ramp waveform Ramp-up is supplied to the scan electrodes, the fifth switch Q5 is turned off. When the fifth switch Q5 is turned off, only the voltage of Vs supplied from the energy supply / recovery unit 10 is applied to the setup supply unit 11. Accordingly, as shown in FIG. 2, the scan electrodes ( The voltage at Y) drops rapidly to Vs.

Thereafter, the seventh switch Q7 is turned off and the tenth switch Q10 is turned on in the set down period. The tenth switch Q10 adjusts the channel width by the second variable resistor VR2 provided at its front end, and lowers the driving voltage with a predetermined slope to the write scan voltage -Vyw (or set down voltage). Accordingly, as shown in FIG. 2, the ramp ramps Ramp-down are supplied to the scan electrodes Y, and the potentials of the scan electrodes Y are lowered to −Vyw.

Here, the seventh switch Q7 includes an internal diode in a reverse direction different from that of the sixth switch Q6, so that the applied voltage is grounded through the sixth switch Q6 and the fourth switch Q4. prevent.

The negative scan voltage supply unit 14 has an eleventh switch Q11 connected to the write scan voltage -Vyw. The eleventh switch Q11 is switched in response to a control signal supplied from a timing controller not shown during the address period of the selective write subfield WSF to supply the write scan voltage -Vyw to the panel driver 16.

The scan reference voltage supply unit 15 includes an eighth switch Q8 and a ninth switch Q9 connected in parallel from the scan bias voltage source Vsc in series, and a third capacitor C3 is connected in parallel thereto.

The eighth switch Q8 supplies the voltage of the scan bias voltage source Vsc to the panel driver 16 as shown in FIG. 2 while being switched by the control signal supplied from the timing controller during the selective write and erase address periods.

The ninth switch Q9 is turned on together with the fourteenth switch Q14, the seventh switch Q7, the sixth switch Q6, and the fourth switch Q4 so that the potential of the scan electrode Y is grounded (GND). Level.

As described above, in the conventional PDP driving apparatus, the reset voltage is applied by applying the ramp waveform only to the Y electrode in the reset section, and at this time, the V setup voltage is applied based on the Vs voltage which is the sustain voltage level. -Wyw power is required in the scan section, and the sustain voltage Vs is alternately applied to the Y and Z electrodes.

However, the conventional PDP driving apparatus as described above has a large magnitude (Vsetup + Vs) of the voltage at which the rising ramp waveform reaches, especially since the sustain period is operated at a high switching frequency, so that the high frequency, high voltage and current The manufacturing cost increases due to the use of enduring elements and components, and there is a problem in that the efficiency of the product is lowered due to heat and noise generated when driving the high rated elements and components.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a driving apparatus and a driving method of a plasma display panel in which the sustain section is driven at a lower rating than the conventional one, thereby reducing the cost and improving the circuit efficiency. have.

In order to achieve the above object, a driving apparatus of a plasma display panel according to the present invention is a driving apparatus of a plasma display panel which applies alternating sustain voltages to the Y electrode and the Z electrode of the panel to maintain the discharge of the selected cell in the sustain period. The driving apparatus of the plasma display panel includes: a first energy supply / recovery unit for supplying and recovering energy of positive sustain voltage (+ Vs / 2) to the Y electrode of the panel; A first switching unit for switching and controlling a current path for supplying and recovering energy of the anode, a negative scan voltage supply unit supplying a negative write scan voltage (-Vs / 2) to the Y electrode of the panel, a Y electrode of the panel, and A panel driver for supplying a driving voltage to the Z electrode, a second switching unit for switching and controlling a current path for supplying energy of positive sustain voltage (+ Vs / 2) to the Z electrode of the panel; A second energy supply / recovery unit for supplying and recovering the energy of the sustain voltage (-Vs / 2) to the Z electrode of the panel and a current path for supplying and recovering the negative energy of the second energy supply / recovery unit And a third switching unit controlled by the control unit.

To this end, the driving apparatus of the plasma display panel includes: a first energy supply / recovery unit for supplying and recovering energy of positive sustain voltage (+ Vs / 2) to the Y electrode of the panel; A setup supply unit supplying a ramp ramp waveform to the Y electrode of the panel; A first switching unit for controlling the first energy supply / recovery unit by switching a current path for supplying and recovering positive energy; A set-down supply unit supplying a ramp ramp waveform to the Y electrode of the panel to descend with a predetermined slope; A negative scan voltage supply unit supplying a negative write scan voltage (-Vs / 2) to the Y electrode of the panel; A scan reference voltage supply unit configured to supply a scan bias voltage Vsc to the panel driver during the selective write and erase address periods; A panel driver supplying a driving voltage to the Y electrode and the Z electrode of the panel; A second switching unit for switching and controlling a current path for supplying energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel; A second energy supply / recovery unit for supplying and recovering energy of a negative sustain voltage (-Vs / 2) to the Z electrode of the panel; The second energy supply / recovery unit includes a third switching unit for switching and controlling a current path for supplying and recovering negative energy.

The first energy supply / recovery unit includes a voltage charging capacitor C1 charged with a voltage of Vs / 4, and the second energy supply / recovery unit includes a voltage charge capacitor C4 charged with a voltage of -Vs / 4. It is preferable to include.

In addition, the driving method of the plasma display panel according to the present invention is the driving method of the plasma display panel in which the sustain voltage alternately applied to the Y electrode and the Z electrode of the panel in order to maintain the discharge of the selected cell in the sustain period. Applying a positive sustain voltage (+ Vs / 2) to the Y electrode of the panel and supplying a rising ramp waveform to the Y electrode of the panel to raise the voltage to the setup voltage; Supplying a falling ramp waveform to the Y electrode of the panel to lower the predetermined ramp and supplying energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel; Supplying a negative write scan voltage (-Vs / 2) to the Y electrode of the panel and applying a scan bias voltage (Vsc) to the scan electrode in an addressing period; And a positive sustain voltage (+ Vs / 2) and a negative sustain voltage (-Vs / 2) are alternately applied to the Y electrode and the Z electrode of the panel to sustain a discharge in a sustain period. .

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

3 is a circuit diagram illustrating a driving apparatus of the plasma display panel according to the present invention, and FIG. 4 is a driving waveform diagram showing an operating state of the driving apparatus of the plasma display panel according to the present invention.

As shown, the driving apparatus of the plasma display panel according to the present invention includes a positive sustain voltage (+ Vs / 2) and a negative sustain voltage (−) having voltage levels of opposite polarities and a voltage difference of Vs / 2 in the sustain period. Vs / 2) is alternately applied to the Y electrode of the panel, and the positive sustain voltage (+ Vs / 2) and the negative sustain voltage (-Vs / 2) are alternately applied to the Y electrode. Alternatingly applied to the electrodes to maintain the discharge.

To this end, the first energy supply / recovery unit 100, the setup supply unit 110, the first switching unit 120, the set-down supply unit 140, the negative scan voltage supply unit 130, and the scan reference The voltage supply unit 150, the panel driver 160, the second switching unit 170, the second energy supply / recovery unit 190, and the third switching unit 180 are included.

The first energy supply / recovery unit 100 supplies and recovers energy of the positive sustain voltage (+ Vs / 2) to the Y electrode of the panel. The first energy supply / recovery unit 100 includes a capacitor C1 for voltage charging charged with a voltage of Vs / 4.

The setup supply unit 110 supplies a rising ramp waveform to the Y electrode of the panel, and the first switching unit 120 switches the current path for supplying and recovering the positive energy of the first energy supply / recovery unit. To control.

The set-down supply unit 140 supplies a falling ramp waveform to the Y electrode of the panel to lower the predetermined down slope.

The negative scan voltage supply unit 130 supplies a negative write scan voltage (-Vs / 2) to the Y electrode of the panel.

The scan reference voltage supply unit 150 supplies the scan bias voltage Vsc to the panel driver 16 during the selective write and erase address periods.

The panel driver 160 supplies a driving voltage to the Y electrode and the Z electrode of the panel.

The second switching unit 170 controls the current path for supplying the energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel.

The second energy supply / recovery unit 190 supplies and recovers the energy of the negative sustain voltage (-Vs / 2) to the Z electrode of the panel. The second energy supply / recovery unit 190 includes a voltage charging capacitor C4 charged with a voltage of −Vs / 4.

The third switching unit 180 controls the second energy supply / recovery unit by switching a current path for supplying and recovering negative energy.

In addition, the present invention provides a method of driving a plasma display panel in which a sustain voltage alternately applied to the Y electrode and the Z electrode of the panel in order to maintain the discharge of the selected cell in the sustain period, the positive sustain voltage (+ Vs / 2) Applying to a Y electrode of the panel and supplying a rising ramp waveform to the Y electrode of the panel to raise the voltage to a setup voltage; Supplying a falling ramp waveform to the Y electrode of the panel to lower the predetermined ramp and supplying energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel; Supplying a negative write scan voltage (-Vs / 2) to the Y electrode of the panel and applying a scan bias voltage (Vsc) to the scan electrode in an addressing period; In the sustain period, the positive sustain voltage (+ Vs / 2) and the negative sustain voltage (-Vs / 2) are alternately applied to the Y electrode and the Z electrode of the panel to maintain a discharge.

Referring to the operation of the present invention configured in this way in more detail as follows.

First, the positive sustain voltage (+ Vs / 2) is supplied from the first energy supply / recovery unit 100. The sustain voltage of + Vs / 2 supplied from the energy supply / recovery unit 100 is supplied to the scan electrodes Y via the sixth switch Q6 and the second selector Q15 of the panel driver 160. do. Thus, as shown in FIG. 4, the voltages of the scan electrodes Y are rapidly increased to + Vs / 2.

On the other hand, the fifth switch Q5 is turned on during the setup period. Since the sustain voltage (+ Vs / 2) is supplied to the lower end of the second capacitor C2, the second capacitor C2 supplies the voltage of Vs / 2 + Vsetup to the fifth switch Q5.

The fifth switch Q5 supplies a voltage having a predetermined slope through the second capacitor C2 while the channel width is adjusted by the first variable resistor VR1 installed at the front end thereof. The voltage applied with the predetermined slope is supplied to the scan electrodes via the first selector Q14 of the panel driver 160.

Through this process, as shown in FIG. 4, the rising ramp waveform Ramp-up of Vs / 2 + Vsetup voltage is supplied to the scan electrodes Y.

After the rising ramp waveform Ramp-up is supplied to the scan electrodes, the fifth switch Q5 is turned off. When the fifth switch Q5 is turned off, only the voltage of Vs / 2 supplied from the energy supply / recovery unit 10 is applied to the setup supply unit 110. Accordingly, as shown in FIG. 4, the scan electrode The voltage of the field Y decreases rapidly to Vs / 2.

Thereafter, the eleventh switch Q11 of the setdown supply unit 140 is turned on in the setdown period. The eleventh switch Q11 lowers the driving voltage with a predetermined slope to the write scan voltage (-Vs / 2).

Accordingly, as shown in FIG. 4, the ramp ramp down is supplied to the scan electrodes Y, and the potential of the scan electrodes Y drops to −Vs / 2.

The negative scan voltage supply unit 130 includes a tenth switch Q10 connected to the second energy supply / recovery unit 190 for supplying energy of the negative sustain voltage (−Vs / 2).

The tenth switch Q10 is switched in response to a control signal supplied from a timing controller (not shown) during the address period of the selective write subfield WSF to supply the write scan voltage (-Vs / 2) to the panel driver 160. do.

The scan reference voltage supply unit 150 includes an eighth switch Q8 and a ninth switch Q9 connected in parallel from the scan bias voltage source Vsc in series.

The eighth switch Q8 supplies the voltage of the scan bias voltage source Vsc to the panel driver 160 as shown in FIG. 4 while being switched by the control signal supplied from the timing controller during the selective write and erase address periods.

In the sustain period, the positive sustain voltage (+ Vs / 2) and the negative sustain voltage (-Vs / 2) are alternately applied to the Y electrode of the panel to maintain discharge.

Meanwhile, the sixteenth switch Q16 of the second switching unit 170 supplies energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel from the first energy supply / recovery unit 100. do. Therefore, as shown in FIG. 4, the positive sustain voltage of + Vs / 2 is maintained at the Z electrode in the set-down period.

In addition, in the sustain period, the positive sustain voltage (+ Vs / 2) and the negative sustain voltage (-Vs / 2) are alternately applied to the Z electrode in order to maintain discharge. do.

In this case, the positive sustain voltage (+ Vs / 2) supplied from the first energy supply / recovery unit 100 is supplied to the panel through the sixteenth switch Q16 and from the second energy supply / recovery unit 190. The supplied negative sustain voltage (-Vs / 2) is supplied to the Z electrode of the panel through the seventeenth switch Q17.

As described above, according to the driving waveform of the present invention, as shown in FIGS. 4 and 5, since the reset voltage Vr is applied over the voltage of + Vs / 2 at the Y electrode, the absolute value of the voltage is smaller than that of the existing waveform. In order to avoid the need for a large rated power supply compared to the conventional drive circuit.

The difference in voltage applied between the Y-Z electrodes is equal to the voltage difference of the existing waveform. In the present invention, by fixing the Z-bias voltage to + Vs / 2, the power for z-bias can be reduced compared to the conventional driving circuit.

In the sustain waveform, when + Vs / 2 is applied to the Y electrode, -Vs / 2 is applied to the Z electrode, and + Vs / 2 is applied to the Z electrode when -Vs / 2 is applied to the Y electrode. It remains the same as that of the existing drive waveform.

By fixing the negative bias power supply to -Vs / 2 in the scan period, another power supply can be reduced. As a result, the driving circuit of the present invention and its waveform can obtain characteristics similar to those of the existing waveform, and the cost for the circuit configuration is reduced.

Meanwhile, as shown in FIG. 5, a negative voltage (−Vs / 2) may be applied to the Z electrode in the reset period to maintain a constant voltage difference between the Y and Z electrodes. In addition, the circuit configuration of the present invention as described above, as shown in this embodiment, may be composed of both Y, Z board or a mono board of either side.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the general knowledge in the field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Anyone with a variety of variations will be possible.

As described above, according to the driving apparatus and method of the plasma display panel of the present invention, the circuit is composed of elements and components driven at low ratings by driving the voltage at the setup section and particularly the sustain section, thereby reducing the cost and the efficiency of the circuit. In addition, the circuit configuration can be increased, the circuit configuration can be simplified, and the driving device can be stably operated.

Claims (4)

In the driving apparatus of the plasma display panel which applies an alternating sustain voltage to the Y electrode and the Z electrode of the panel to maintain the discharge of the selected cell in the sustain period, The driving device of the plasma display panel is A first energy supply / recovery unit for supplying and recovering energy of positive sustain voltage (+ Vs / 2) to the Y electrode of the panel; A first switching unit for controlling the first energy supply / recovery unit by switching a current path for supplying and recovering positive energy; A negative scan voltage supply unit supplying a negative write scan voltage (-Vs / 2) to the Y electrode of the panel; A panel driver supplying a driving voltage to the Y electrode and the Z electrode of the panel; A second switching unit for switching and controlling a current path for supplying energy of the positive sustain voltage (+ Vs / 2) to the Z electrode of the panel; A second energy supply / recovery unit for supplying and recovering energy of a negative sustain voltage (-Vs / 2) to the Z electrode of the panel; And A third switching unit for controlling the second energy supply / recovery unit by switching a current path for supplying and recovering negative energy Driving apparatus for a plasma display panel comprising a. The method of claim 1, The driving device of the plasma display panel is A setup supply unit supplying a ramp ramp waveform to the Y electrode of the panel; A set-down supply unit supplying a ramp ramp waveform to the Y electrode of the panel to descend with a predetermined slope; And And a scan reference voltage supply unit configured to supply a scan bias voltage Vsc to the panel driver during the selective write and erase address periods. The method of claim 1, The first energy supply / recovery unit includes a voltage charging capacitor C1 charged with a voltage of Vs / 4, and the second energy supply / recovery unit includes a voltage charge capacitor C4 charged with a voltage of -Vs / 4. And a driving device of the plasma display panel. delete

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