KR20050077823A - Method compensating luminance for driving plasma display panel - Google Patents

Abstract

The present invention relates to a method of driving a plasma display panel, and more particularly, to a method of driving a plasma display panel capable of compensating luminance. In the plasma display panel including the X electrode, the Y electrode, and the Z electrode, the present invention relates to a plasma display panel comprising: a) a reset step of forming wall charges on the plasma display panel, b) an address step of selecting a cell to be discharged, and c) a sustain pulse. D) selecting a cell to be erased among the cells in which the discharge is maintained, e) forming a wall charge of the unerased cell, and f) maintaining a discharge of the unerased cell Steps.

As such, the present invention minimizes the luminance deterioration of the selective erasing section by having a separate wall charge forming section in the selective erasing section.

Description

Method of driving plasma display panel capable of compensating luminance {Method Compensating Luminance for Driving Plasma Display Panel}

The present invention relates to a method of driving a plasma display panel, and more particularly, to a method of driving a plasma display panel capable of compensating luminance.

The conventional Selective Write / Selective Erase driving method (hereinafter referred to as SWSE driving method) forms a wall charge of a cell to be displayed in the SW driving region, causes sustain discharge, and does not display in the next SE driving region. The screen was displayed by performing erasure discharge on the cells that would not.

In the case of using the SE driving method, there is an advantage of increasing the screen display time in realizing a high-resolution screen by reducing the reset discharge time. However, since there is no reset discharge when switching from the SW driving region to the SE driving region, the luminance reduction range is increased.

1 is a table showing a luminance ratio for one sustain pulse when switching from a general SW driving method to an SE driving method, and FIG. 2 is a graph illustrating the table of FIG. 1. 1 and 2 show luminance values per sustain pulse when the ER_up time (Energy Recovery Time) is changed to 300 ns, 400 ns, and 500 ns in two three-electrode structures (Model 1 and Model 2), respectively. At this time, the ER time means a time when the sustain pulse rises from 0V to the sustain voltage or a time when the sustain pulse falls to 0V from the sustain voltage.

As shown in the tables and graphs of FIGS. 1 and 2, the slope of the luminance value per sustain pulse is changed when the subfield 5 (SW5), which is the selective writing section, is switched to the subfield 6 (SE6), which is the selective erase section. It can be seen that increases.

3 shows a driving waveform used in a conventional SWSE driving method. As shown in FIG. 3, the SW section includes a reset section, an address section, and a sustain section. In the reset period, after the wall charges using the ramp-up and ramp-down waveforms are formed, the cells to be discharged are selected in the address period, and then sustain pulses are alternately applied to the Y and Z electrodes to maintain the discharge of the selected cells. .

The SE section consists of an address section and a sustain section. The addressing in the SE driving is performed by erasing selected cells among cells to which light emission is to proceed in the previous subfield, and remaining cells maintain discharge by sustain pulses.

As described above, there is a section in which the wall charges are formed since the reset process is performed in the SW section, but there is no section in which the wall charges are formed in the SE section. Therefore, when the discharge is maintained by switching from the SW section to the SE section, the amount of wall charges in the SE section is reduced by about 10-20V relative to the SW section.

4 is a diagram illustrating an optical waveform in a SW section and an SE section. As shown in FIG. 3, when the ER times are 300 ns, 400 ns, and 500 ns, and the transition from the subfield 2 (SW2) of the selective write interval to the subfield 3 (SE3) of the selective erase interval is reduced, the measured light waveform is reduced. Reduced due to charge.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a method of driving a plasma display panel that can compensate for a decrease in luminance caused by a reduction in the amount of wall charges during selective erasure.

In order to achieve the above object, the present invention provides a plasma display panel including an X electrode, a Y electrode, and a Z electrode. The present invention relates to a plasma display panel including: a) a reset step of forming wall charges on a plasma display panel, and C) applying a sustain pulse to maintain the discharge; d) selecting a cell to be erased among the cells in which the discharge has been retained; e) forming a wall charge of the cell that has not been erased; and f) not erased. Maintaining a discharge of the cell.

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

5 is a block diagram illustrating a driving apparatus of a general plasma display panel. The signal processor 510 converts the image signal input from the outside into image data suitable for driving the plasma display panel.

The data aligning unit 520 reconstructs the image data of one TV field into a selective writing subfield and a selective erasing subfield for gray scale processing of the image data converted by the signal processing unit 510. do.

The X electrode driver 530 and the Y electrode driver 540 apply reset pulses, scan pulses, and addressing pulses necessary for the selective write period and apply erase pulses for the selective erase period.

The Y electrode driver 540 and the Z electrode driver 550 alternately apply a sustain pulse to sustain the discharge to the Y electrode and the Z electrode, respectively.

The main controller 560 controls the image data rearranged to the data alignment unit 520 in order according to the external image signal to be supplied one by one scan line to the X electrode driver 530 and drives the logic control pulses at high voltage. Applied to the circuit unit 570.

The high voltage driving circuit unit 570 receives a logic control pulse from the main control unit 560 and applies the high voltage control pulse to the X electrode, the Y electrode, and the Z electrode driving unit 530, 540, 550.

6 is a waveform diagram illustrating a SWSE driving method according to the present invention. As shown in FIG. 5, in the SWSE driving method according to the present invention, a wall charge formation section exists separately between an address section and a sustain section in the SE section.

That is, a positive pulse (①, ① ') is applied to the Z electrode and the X electrode before the sustain period, so that a discharge is generated and the wall charge increases first. Again, positive pulses (②, ③) are applied to the Y electrode and the Z electrode, and since the positive pulse (②) applied to the Y electrode is shorter than the positive pulse (③) applied to the Z electrode, Larger negative wall charges are formed in the wall charges. Preferably, the magnitude of the plus pulses (1, 2, 3) is equal to the magnitude of the sustain voltage.

In this case, the positive pulses (①, ① ') may be applied to the Y electrode and the X electrode in the wall charge formation period, and the positive pulses ③ and the positive pulse ② may be applied to the Y electrode and the Z electrode, respectively. .

Next, sustain discharge is performed by alternately applying sustain pulses to the Y and Z electrodes.

As described above, since the wall charge forming section is separately present in the selective erasing section, the luminance deterioration in the selective erasing section can be minimized.

In the embodiment of the present invention, the wall charge formation process subsequent to the primary wall charge is described, but only the primary wall charge is formed.

7 is a table comparing the amount of decrease in luminance by the SWSE driving method according to the present invention and the amount of reduction in luminance by the SWSE driving method according to the present invention. As shown in FIG. 7, when the waveforms according to the present invention are applied when the sustain voltages are 180 V, 190 V, and 200 V, the decrease in luminance per sustain pulse is smaller than that of the conventional waveforms.

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 minimizes the degradation of the luminance of the selective erasing section by having a separate wall charge forming section in the selective erasing section.

FIG. 1 is a table illustrating a luminance ratio with respect to the number of sustain pulses when switching from a general SW driving method to an SE driving method.

2 is a graph illustrating a luminance ratio with respect to the number of sustain pulses when switching from a general SW driving method to an SE driving method.

3 shows a driving waveform used in a conventional SWSE driving method.

4 is a diagram illustrating an optical waveform in a SW section and an SE section.

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

6 is a waveform diagram illustrating a SWSE driving method according to the present invention.

7 is a table comparing the amount of decrease in luminance by the SWSE driving method according to the present invention and the amount of reduction in luminance by the SWSE driving method according to the present invention.

Claims (4)

A plasma display panel comprising an X electrode, a Y electrode, and a Z electrode, A reset step of forming wall charges in the plasma display panel; An address step of selecting a cell in which discharge will occur; Applying a sustain pulse to maintain discharge; Selecting a cell to be erased among the cells in which discharge is maintained; Applying a pulse to two electrodes of the X electrode, the Y electrode, and the Z electrode to form a wall charge of an unerased cell; And And maintaining a discharge of the non-erased cell. The method of claim 1, The wall charge formation of the unerased cells is Applying a plus pulse to the X electrode and the Z electrode, applying a plus pulse to the Y electrode and the Z electrode, applying a ground level voltage to the Y electrode, and applying the plus pulse to the Z electrode. Is continuously applied to the plasma display panel. The method of claim 1, The wall charge formation of the unerased cells is Applying a plus pulse to the X electrode and the Y electrode, applying a plus pulse to the Y electrode and the Z electrode, applying a ground level voltage to the Z electrode, and applying the plus pulse to the Y electrode. Is continuously applied to the plasma display panel. The method according to claim 2 or 3, And a positive pulse applied simultaneously to the Y electrode and the Z electrode is the same as the sustain voltage.