JPH0764508A - Method and device for driving display panel - Google Patents

Abstract

PURPOSE:To reduce a discharge current or momentary discharge current (peak discharge current) in a PDP(plasma display panel). CONSTITUTION:A driving device for a display panel which displays an image by an input video signal on the PDP 1 is equipped with an address driver part 5 which designates a cell in accordance with the input video signal, first and second X-sustain driver parts 6, 7 which generate X-sustin voltages with different phases at every block 1a, 1b which separate plural sustain electrodes of the PDP 1 to two parts, first and second Y-sustain driver parts 8, 9 which generate Y-sustain voltages with different phases at every block 1a, 1b, and first and second scanning driver parts 10, 11 which scan the dells of the blocks 1a, 1b of the PDP 1 by generated Y-sustain voltages, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PDP (Plasma Display Panel) used for a television or the like.
More particularly, the present invention relates to a display panel driving method and apparatus for reducing a discharge current in a PDP.

[0002]

2. Description of the Related Art In recent years, this PDP (plasma display panel) is excellent in a large screen among flat displays, and is capable of full-color display and high-speed gradation display. (For example, wall-mounted television).

By the way, as shown in FIG. 3, the driving device for driving the PDP 1 of the display panel comprises an X sustain driver section 2, a Y sustain driver section 3, a scan address driver section 4 and an address driver section 5. .

The driving device having the above-described configuration applies a driving voltage (X sustain voltage and Y sustain voltage) to each X and Y sustain electrode of the PDP 1 to drive each cell of the PDP 1. Specifically, as shown in FIGS. 4A and 4B, the sustain voltage pulse generated by the X sustain driver unit 2 and the Y sustain driver unit 3 is applied to each sustain electrode, and the address driver unit 5 operates. A predetermined cell is designated. Then, Fig. 4
As shown in (c), a discharge current flows in the designated cell, whereby an image, characters, etc. are displayed on the PDP 1.

[0005]

By the way, the above PDP
In the driving device, the X sustain voltage and the Y sustain voltage, which are generally generated for display discharge, have the same phase on the entire screen of the PDP 1, so that the instantaneous discharge current (peak discharge current) of the PDP 1 is generated. Grows larger.

Therefore, it is necessary to use a large power supply capacity for the driving device. Especially, as the screen of the PDP 1 is larger, the power supply capacity needs to be increased.
In addition, the drive voltage drops due to the impedance of the lead wire (common impedance) for applying the drive voltage to each cell, and unnecessary radiant noise is generated outside, making it difficult to make a large screen panel. ing.

The present invention has been made in view of the above problems, and an object thereof is to reduce the power supply capacity of a driving device, to suppress a voltage drop due to impedance of a lead wire, and to It is an object of the present invention to provide a display panel driving method and apparatus capable of suppressing a voltage drop due to impedance, reducing unwanted radiant noise to the outside, and eventually making it usable as a large screen.

[0008]

To achieve the above object, in a method of driving a display panel for displaying an image on a plasma display panel by an input video signal according to the present invention, the plasma display panel is divided into a plurality of blocks. The gist is that the phase of the drive voltage applied to each block is shifted.

[0009]

According to the above means, the plasma display panel is divided into a plurality of blocks, and the phase of the drive voltage applied to the sustain electrodes of each block is shifted, that is, the phase of the sustain voltage (drive voltage) is different in each block.

Therefore, the discharge current of the plasma display panel is dispersed, so that the discharge current (peak discharge current) instantaneously flowing in the entire screen of the plasma display panel is reduced according to the number of blocks.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display panel driving method and apparatus according to the present invention divides a plurality of sustain electrodes of a PDP (plasma display panel) into a plurality of blocks, and each block has a separate sustain driver. Shift the phase of the generated sustain voltage,
Disperse the discharge current of the PDP and reduce the instantaneous discharge current.

Therefore, the display panel driving device of the present invention has, for example, the configuration shown in FIG. In the figure, the same parts as those in FIG. 3 are designated by the same reference numerals, and duplicate description will be omitted.

In FIG. 1, a driving device for this display panel is a plasma display panel (hereinafter referred to as PDP).
1 and 2 for generating drive voltages (X sustain voltage) of blocks 1a and 1b which are divided into two
X sustain driver section (driving voltage generating means) 6, 7
And first and second Y sustain driver sections (driving voltage generating means (driving voltage generating means) 8 and 9 for generating driving voltages (Y sustain voltage) of the blocks 1a and 1b in different phases, and cells of the PDP1. And the first and second scan driver units 10 and 11 for scanning.

Next, the operation of the driving device having the above-mentioned structure and the operation of the driving method will be described with reference to the time chart of FIG. To do.

Then, the first and second X sustain driver sections 6 and 7 generate the first and second sustain voltages shown in FIGS. 2A and 2C, respectively. Similarly, the first and second Y sustain driver sections 8 and 9 generate the first and second sustain voltages shown in FIGS. 2B and 2D, respectively.

That is, as apparent from FIG. 2, the first and second sustain voltages generated in the first and second X sustain driver sections 6 and 7 are out of phase with each other, and the first and second sustain voltages are out of phase with each other. The first and second sustain voltages generated in the Y sustain driver units 8 and 9 are also out of phase. In other words, the phases of the drive voltage applied to the sustain electrodes are different between the block 1a and the block 1b, so that the discharge current of the PDP 1 is dispersed.

The PDP 1 is divided into two blocks 1a,
1b, and the generated sustain voltage is applied to the X sustain electrode and the Y sustain electrode of each divided block, while the address driver unit 5 causes the PDP to operate.
By designating each cell of No. 1, a discharge current can be passed through each cell (shown in FIG. 2 (e)).

Thus, the PDP 1 is divided into two blocks 1.
The sustain electrodes of the entire screen of the PDP 1 are divided into two blocks a and 1b, and the phase of the sustain voltage applied to the sustain electrodes of each block is shifted for each block. Therefore, PDP1
The discharge current and the instantaneous discharge current (peak discharge current) are 1/2, which are smaller than those in the conventional case, and the discharge current of the PDP 1 can be reduced.

Further, by reducing the peak discharge current,
Not only does the power supply capacity of the drive unit be small, but the drop in the sustain voltage due to the impedance of the lead wire (common impedance) can be suppressed to a small level, which in turn can reduce power loss and the voltage between the discharge cells. Can be reduced, unnecessary radiation to the outside can be reduced, and noise to the power supply line can be reduced. For example, the PDP 1 can be used for a large screen.

Although each sustain electrode of the PDP 1 is divided into two blocks in the above embodiment, it is divided into, for example, three blocks, and the phases of the sustain voltage applied to the sustain electrodes of each divided block are shifted. If
The discharge current and peak discharge current can be reduced to 1/3,
If the number of divided blocks is increased, the discharge current and the peak discharge current can be further reduced.

[0021]

As described above, according to the image display method and apparatus of the present invention, a plurality of sustain electrodes of a PDP (plasma display panel) are divided into a plurality of blocks, and a separate sustain driver is provided for each block. In addition, since the phase of the sustain voltage generated in each sustain driver is shifted to distribute the discharge current in the PDP, the power supply capacity of the driving device can be reduced, and the voltage drop due to the impedance of the lead wire can be suppressed. In addition to the above, there is a useful effect that the unnecessary radiant noise to the outside can be reduced, and the PDP can be used as a large screen.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a drive device for a display panel showing an embodiment of the present invention.

FIG. 2 is a schematic time chart diagram explaining the operation of the drive device shown in FIG. 1 and the operation of the image display method.

FIG. 3 is a schematic block diagram of a conventional display panel driving device.

FIG. 4 is a schematic time chart diagram for explaining the operation of the drive device shown in FIG.

[Explanation of symbols]

 1 PDP (Plasma Display Panel) 1a, 1b Block (of PDP 1) 5 Address Driver Section 6 First X Sustain Driver Section 7 Second X Sustain Driver Section 8 First Y Sustain Driver Section 9 Second Y Sustain Driver Part 10 First scan driver part 11 Second scan driver part

Claims (3)

[Claims] 1. A display panel driving method for displaying an image on a plasma display panel according to an input video signal, wherein the plasma display panel is divided into a plurality of blocks, and a phase of a driving voltage applied to each block is shifted. A method of driving a display panel, comprising: 2. A display panel driving device for displaying an image on a plasma display panel according to an input video signal, and address driver means for designating at least cells of the plasma display panel according to the input video signal, and the plasma display panel. And a plurality of drive voltage generating means for generating drive voltages with different phases for each block, and the phase of the drive voltage applied to each block is shifted. Drive. 3. A display panel driving apparatus for displaying an image on a plasma display panel according to an input video signal, comprising address driver means for designating cells of the plasma display panel according to the input video signal, and the plasma display panel. A plurality of X sustain driver means and a plurality of Y sustain driver means for generating sustain voltages for applying to the sustain electrodes of the rows and columns of the same plasma display panel in different phases for each block; A drive device for a display panel, comprising: a plurality of scan driver means for scanning cells of the plasma display panel by a sustain voltage generated by the Y sustain driver means.