KR100603660B1 - Driving Apparatus of Plasma Display Panel - Google Patents

Abstract

The present invention relates to a driving device of a plasma display panel. A driving apparatus of a plasma display panel of the present invention is a device for driving a plasma display panel including a plurality of discharge cells formed with an X electrode, a Y electrode, and a Z electrode in accordance with a reset period, an address period, and a sustain period. A first switching element connected to the electrode and switching to apply a bias voltage to the Y electrode during the address period; A scan driver switching element having one end connected to each of the Y electrodes and turned on or off according to a scan control signal; And a second switching element connected in common with the other end of the scan driver switching element, and switching to apply a scan voltage to the Y electrode during the address period. According to the present invention as described above, address margin can be secured by using the bias level as a positive or negative bias power source rather than ground, and can be applied to various panels. In addition, the present invention can protect the switching element of the scan driver by removing the influence of the sustain voltage on the scan driver during the sustain process.

Plasma, display, panel, drive, bias, protection

Description

Driving apparatus for plasma display panel {Driving Apparatus of Plasma Display Panel}

1 is a block diagram of a driving apparatus of a general plasma display panel.

2 is a circuit diagram of a driving apparatus of a plasma display panel including a conventional scan driver.

3 is a diagram illustrating a driving apparatus of a plasma display panel according to a first embodiment of the present invention.

4 is a driving waveform diagram of a driving device of the plasma display panel shown in FIG. 1.

5 is a diagram illustrating a driving apparatus of a plasma display panel according to a second exemplary embodiment of the present invention.

FIG. 6 is a driving waveform diagram of the driving apparatus of the plasma display panel shown in FIG. 5.

7 is a diagram illustrating a driving apparatus of a plasma display panel according to a third exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for driving a plasma display panel. More particularly, the present invention relates to driving a plasma display panel that can secure an address margin by using a bias level as a positive or negative bias power source rather than ground. Relates to a device.

1 is a block diagram of a driving apparatus of a general plasma display panel. As shown in FIG. 1, the signal processor 110 converts an externally input image signal into image data suitable for driving a plasma display panel.

The data aligning unit 120 reconstructs the image data of one TV field into a plurality of subfields for gray scale processing of the image data converted by the signal processing unit 110.

The X electrode driver 130 and the Y electrode driver 140 apply an address pulse and a scan pulse to the X electrode and the Y electrode to form wall voltages in the discharge cells of the plasma display panel, respectively. The Z electrode driver 150 alternately applies a sustain pulse to sustain the discharge of the discharge cell in which the wall voltage is formed, to the Y electrode and the Z electrode, respectively.

The main controller 160 controls the rearranged image data of the data alignment unit 120 to be sequentially supplied to the X electrode driver 130 by one scan line in accordance with an external image signal, and drives the logic control pulse at a high pressure. Applied to the circuit unit 170.

The high voltage driving circuit unit 170 receives a logic control pulse from the main controller 160 and applies the high voltage control pulse to the X electrode, the Y electrode, and the Z electrode driving unit 130, 140, and 150.

In this case, the Y electrode driver 140 includes a scan driver 210 as shown in FIG. 2 to apply a scan pulse or a sustain pulse to the Y electrode. The conventional scan driver 210 is an IC package (Integrated Circuit package) containing two switching elements. Since two switching elements form one channel to apply a scan pulse or a sustain pulse to one Y electrode, a switching element having a high breakdown voltage should be used. As described above, since the conventional scan driver 210 is composed of two switching elements having a high breakdown voltage, the cost increases and the IC package becomes large.

In addition, the channel that is not selected by the scan driver 210 in the scanning process should always turn on the first switching elements 211-1 to 211-n to hold the ground level.

For example, if a channel corresponding to the first Y electrode Y1 is selected in the scanning process, a channel corresponding to the remaining Y electrodes Y2, Y3, ..., Yn is not selected. When the channel is selected in this way, the second switching element 213-1 of the first scan driver 210-1 corresponding to the selected channel is turned on and the scanning switching element 220 is turned on. At the same time, the first switching elements 211-2 to 211-n and the ground switching elements 230 of the scan drivers 210-2 to 210-n corresponding to the unselected channels are turned on.

As such, when the switching elements operate and a data pulse is applied to the X electrodes X1 to Xm, a write operation is performed to the cell located on the first line. In addition, the data pulses include the first switching elements 211-2 to 211-n and the ground switching elements 230 of the scan drivers 210-2 to 210-n corresponding to the remaining Y electrodes Y2 to Yn. After being grounded. Since the level of the first switching elements 211-2 to 211-n of the unselected scan drivers 210-2 to 210-n becomes the ground level, the reference level in the scanning process is the ground level, and the reference level is The ground level is immutable and fixed. In FIG. 2, reference numeral 240 denotes a switching element for applying the sustain voltage (+ Vsy) to the Y electrode, and reference numeral 250 denotes a switching element for applying the sustain voltage (+ Vsz) to the Z electrode.

However, the driving characteristics differ slightly depending on the type of plasma display panel. That is, the reference level may not be the ground level. In the conventional driving apparatus, since the reference level is the ground level, a problem occurs when the plasma display panel is not. In addition, since a fixed ground level is used, there is a problem in that it is not compatible or compatible depending on the state of the plasma display panel, such as when a driving margin is insufficient or a panel having a different structure is used.

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SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by using a bias level as a positive or negative bias power source rather than ground, an address margin can be secured, and a plasma display panel driving apparatus can be applied to various panels. It is to.

A driving apparatus of a plasma display panel for achieving the above object is a device for driving a plasma display panel including a plurality of discharge cells formed with an X electrode, a Y electrode, and a Z electrode in accordance with a reset period, an address period, and a sustain period. A first switching element connected to the Y electrode and switching to apply a bias voltage to the Y electrode during an address period; A scan driver switching element having one end connected to each of the Y electrodes and turned on or off according to a scan control signal; And a second switching element connected in common with the other end of the scan driver switching element, and switching to apply a scan voltage to the Y electrode during the address period.
According to such a feature, the first switching element switches so that a positive bias voltage or a negative bias voltage is applied.
According to another aspect of the present invention, a driving device of a plasma display panel is a device for driving a plasma display panel including a plurality of discharge cells formed with an X electrode, a Y electrode, and a Z electrode according to a reset period, an address period, and a sustain period. A first switching element connected to said Y electrode and switching to apply a bias voltage to said Y electrode during an address period; A scan driver switching element having one end connected to each of the Y electrodes and turned on or off according to a scan control signal; A second switching element connected in common with the other end of the scan driver switching element and switching to apply a scan voltage to the Y electrode during an address period; And a protective switching element connected to the Y electrode and switching so that the Y electrode is electrically connected to the ground when a sustain pulse is applied to the Z electrode in the sustain period.
According to such a feature, the first switching element switches so that a positive bias voltage or a negative bias voltage is applied.

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

3 is a diagram illustrating a driving apparatus of a plasma display panel according to a first embodiment of the present invention. An operation of the driving apparatus according to the present invention during the scan process and the sustain process will be described with reference to FIG. 3.

First, the switching element SD1 of a data driver (a of DD1 to DDm) corresponding to a cell to which data is to be written is turned on so that + Vd is applied to the corresponding X electrode (a of X1 to Xm). The switching elements SD2 of the b data drivers DD1 to b of DDm are turned on, and the ground level is applied to the corresponding X electrodes X1 to b of Xm.

At the same time, the first bias level switching element 310 and the second bias level switching element 320 are turned on, and the scan driver 330-corresponding to the selected Y electrode, for example, the first Y electrode Y1 selected. The switching element SW1 of 1) is turned on and the switching elements SW2 to SWn of the scan drivers 330-2 to 330-n corresponding to the remaining Y electrodes Y2 to Yn are turned off.

Accordingly, -Vyscan is applied to the selected first Y electrode Y1 and + Vp is applied to the remaining Y electrodes Y2 to Yn. In addition, Vd + Vyscan is applied to a cell in which + Vd is applied to the corresponding X electrode by the turning-on of the switching element SD1 of a data driver (DD1 or a of DDm) among the cells on the first Y electrode Y1. The voltage difference occurs and data writing is performed.

Since the + Vp voltage is applied to the unselected Y electrode and the -Vyscan is applied to the selected Y electrode, the reference level becomes + Vp instead of the ground level as in the related art.

Next, in the sustain process, the first sustain switching element 340 and the ground switching element 350 are turned on, and the first bias level switching element 310, the second bias level switching element 320, and the scan driver are turned on. The switching elements SD1 and SD2 of the switching elements SW1 to SWn and the data drivers DD1 to DDn are turned off.

Accordingly, the first sustain switching element 340, the scan driver diodes D1 to Dn, the Y electrodes Y1 to Yn, the Z electrodes Z1 to Zn, the ground switching element 350, and the ground are one. Form a loop. By forming such a loop, the sustain voltage Vsy is applied to the Y electrodes Y1 to Yn.

In addition, the second sustain switching element 360 and the ground switching element 370 are turned on and the remaining switching elements are turned off. Accordingly, the second sustain switching element 360, the Z electrodes Z1 to Zn, the Y electrodes Y1 to Yn, the ground switching element 370, and the ground form one loop. By forming such a loop, the sustain voltage Vsz is applied to the Z electrodes Z1 to Zn.

As such, the sustain voltage (Vsy or Vsz) is applied to the Y electrode and the Z electrode alternately to maintain the discharge.

When driving using a ground level as in the prior art, a problem occurs in which various plasma display panels cannot cope. However, the present invention can supply a positive power (+ Vp) or a negative power (-Vyscan) as a bias level power supply. Therefore, the bias can be appropriately controlled according to the plasma display panel.

4 is a driving waveform diagram of a driving device of the plasma display panel shown in FIG. 1. As shown in FIG. 4, the voltage applied to the selected Y electrode during the scanning process is -Vyscan, and the level of the voltage applied to the unselected Y electrode becomes + Vp.

5 is a diagram illustrating a driving apparatus of a plasma display panel according to a second exemplary embodiment of the present invention. The difference between the second embodiment shown in FIG. 5 and the first embodiment shown in FIG. 3 is that the voltage connected to the switching element 310 for the first bias level is -Vp instead of + Vp. In other words, the bias level changed from positive to negative.

FIG. 6 is a driving waveform diagram of the driving apparatus of the plasma display panel shown in FIG. 5. As shown in FIG. 6, the level of the voltage applied to the selected Y electrode is -Vyscan, and the level of the voltage applied to the unselected Y electrode is -Vp. At this time, the absolute value of -Vyscan is larger than the absolute value of -Vp.

Therefore, the driving apparatus of the present invention can secure an address margin as compared with the conventional driving apparatus, and thus can be applied to all plasma display panels.

7 is a diagram illustrating a driving apparatus of a plasma display panel according to a third exemplary embodiment of the present invention. Since the operation of the driving apparatus of the plasma display panel shown in FIG. 7 is the same as in the first embodiment, detailed description thereof will be omitted.

In order to protect the switching elements SW1 to SWn of the scan driver in the sustain process, a protective switching element 380 is further included on the outside. The protective switching element 380 is turned on so that power is not applied during the sustain process.

That is, in the third embodiment of the driving apparatus according to the present invention, the protection switching element 380 is applied in the process of applying the sustain voltage Vsz to the Z electrodes Z1 to Zn by turning on the second sustain switching element 360. And the turn-on of the ground switching element 390 block the influence of the sustain voltage Vsz on the scan drivers 330-1 to 330-n.

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 present invention can secure an address margin by using a bias level as a positive or negative bias power source rather than ground, and can be applied to various panels. In addition, the present invention can protect the switching element of the scan driver by removing the influence of the sustain voltage on the scan driver during the sustain process.

Claims (5)

A device for driving a plasma display panel including a plurality of discharge cells in which an X electrode, a Y electrode, and a Z electrode is formed in accordance with a reset period, an address period, and a sustain period, A first switching element connected to the Y electrode and switching to apply a bias voltage to the Y electrode during an address period; A scan driver switching element having one end connected to each of the Y electrodes and turned on or off according to a scan control signal; And And a second switching element connected in common with the other end of the scan driver switching element, and switching to apply a scan voltage to the Y electrode during an address period. The method of claim 1, And the first switching element switches to apply a positive bias voltage or a negative bias voltage. delete A device for driving a plasma display panel including a plurality of discharge cells in which an X electrode, a Y electrode, and a Z electrode is formed in accordance with a reset period, an address period, and a sustain period, A first switching element connected to the Y electrode and switching to apply a bias voltage to the Y electrode during an address period; A scan driver switching element having one end connected to each of the Y electrodes and turned on or off according to a scan control signal; A second switching element connected in common with the other end of the scan driver switching element and switching to apply a scan voltage to the Y electrode during an address period; And And a protective switching element connected to the Y electrode and switching so that the Y electrode is electrically connected to the ground when a sustain pulse is applied to the Z electrode in the sustain period. The method of claim 4, wherein And the first switching element switches to apply a positive bias voltage or a negative bias voltage.

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