KR20010005080A - Driving method of Plasma Display panel - Google Patents

Abstract

PURPOSE: A drive method of PDP(Plasma Display Panel)is provided to simultaneously address two data in a scan time as same as prior scan time to shorten the addressing time and lengthen the time of a sustain section, thereby increasing the brightness of the PDP. CONSTITUTION: The drive method of PDP comprises a step dividing a frame into plural sub fields for displaying a picture on a 3-electrode surface discharge PDP(Plasma Display Panel), and dividing respective sub field into a reset section, an address section and a sustain section. In the first step, 2 continuous bit data of the sub field in addressing are sequentially applied to one scan field to make wall charges formed in a scan electrode different. In the second step, two continuous sustain pulse groups having different voltage levels are sequentially applied in the sustain section.

Description

Driving method of plasma display panel {Driving method of Plasma Display panel}

The present invention relates to a method of driving a plasma display panel (hereinafter referred to as PDP).

1 shows a voltage waveform diagram of an address-display separation (ADS) drive in a conventional PDP driving method.

When driving the PDP drive using the ADS method, each sub-frame is divided into a reset section, an address section, and a sustain section. As already known, one frame is divided into eight subframes, and each of the eight subframes is divided into the reset period, the address period, and the sustain period.

The reset period is a period in which a voltage for starting discharge is applied, although the time is relatively short.

The address section simultaneously applies a data voltage to the entire address electrode when the scan electrode of the front panel is scanned. The purpose of the address is to create a wall charge on the Y electrode of the cell to be discharged. For example, a VGA class PDP has 480 parallel X and Y electrodes on the front panel, and the back panel has 2560 address electrodes perpendicular to the X and Y electrodes, passing through the center of one cell. In the address section for giving data, pulses are simultaneously applied to the Y electrode and the address electrode to discharge the same. That is, a scanning pulse is applied to one line of the Y electrode and discharged by applying pulses to 2560 address lines at the same time to generate wall charges on one line of the selected Y electrode.

The maintenance period is actually a period in which the PDP is turned on. Each of the eight subframes in one frame is adjusted by the sustain pulse to display a desired image. As a result, eight subframes having different weights operate sequentially.

As described above, the conventional ADS method has a problem that the luminance is low because the ratio of the addressing time to the limited frame time is large and the temporal ratio of applying the sustain pulse indicating the luminance is low.

The present invention has been made to solve the problems of the prior art as described above, by simultaneously addressing two data within the scanning time as in the prior art, and eventually shortening the addressing time compared with the conventional to increase the duration of the PDP It is an object of the present invention to provide a PDP driving method for increasing luminance.

1 is a driving voltage waveform diagram of an address section and a sustain section of a conventional plasma display panel;

2 is a driving voltage waveform diagram of an address section and a sustain section of a plasma display panel according to an embodiment of the present invention;

3A is a driving voltage waveform diagram of an address section and a sustain section of a plasma display panel according to another embodiment of the present invention;

3B is a driving voltage waveform diagram of an address section and a sustain section of the plasma display panel according to another embodiment of the present invention;

* Explanation of symbols for main parts of the drawings

a1, a2, b1, b2: data pulse

Vsa: Holding pulse group with low voltage level Vsb: Holding pulse group with high voltage level

In order to achieve the above object, the present invention divides one frame into a plurality of subfields for displaying an image on a three-electrode surface discharge PDP, and divides each subfield into a reset section, an address section, and a sustain section. A method of driving a three-electrode surface discharge PDP, comprising: a first step of sequentially applying two-bit data of the subfield consecutively to one scan pulse during addressing so that wall charges formed on the scan electrodes are different from each other; And a second step of sequentially applying two consecutive sustain pulse groups having weights having different voltage levels in the sustain period.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. do.

2 is a diagram illustrating driving voltage waveforms of an address period and a sustain period of a PDP according to an embodiment of the present invention.

Referring to FIG. 2, as in the prior art, the driving unit of the PDP includes a data electrode representing a cell to be discharged, a scan electrode group Y for scanning each line, and a sustain electrode group X for sustain discharge. It consists of. There is also a reset section for starting discharge, an address section for giving data, and a sustain section for holding the discharge. In FIG. 2, the reset section having a relatively short time is not shown.

The data driving waveform sequentially applies two data an and bn in synchronization with one scan pulse. At this time, since the data a1 and b1 are applied with a difference in time, the lengths of time for which the scanning pulses synchronous with this form wall charges are different. That is, since the scanning pulse attracts wall charges for a longer time than data b1, the amount of wall charges by a1 is large. Therefore, the wall voltage formed by the data a1 and b1 is different. Eventually, since data a is applied before b, the wall voltage Vba (wall voltage formed by discharging at a) is higher than Vbb (wall voltage formed by discharging at b) after addressing. Branch is applied with a continuous sustain pulse group.

In this case, the sustain pulse group has a different voltage level in the sustain period. As shown in FIG. 2, when Vsb is made higher than Vsa, when the wall voltage is low, the discharge is not possible at Vsa, but only at Vsb. In this case, the data a and b each have a binary sign (on-off), and if the value is 10, the same result occurs as when 11, which is the data conversion before storing the data in the frame memory Problems like this are solved. At this time. Since 8-bit can be converted to 9-bit or 10-bit, the image quality can be improved by converting even considering image compensation. With the above driving method, the addressing time can be reduced and it is possible to increase the luminance of the PDP.

FIG. 3A is a waveform diagram of a driving voltage according to another exemplary embodiment of the present invention. As shown in FIG. 3A, a wall generated when addressing a data voltage a1 corresponding to data a is set higher than a voltage b1 corresponding to data b. The difference in charge can be made more pronounced for a more accurate driving.

3B is a driving voltage waveform diagram according to another embodiment of the present invention. As shown in the figure, the difference in the voltage of the scan pulse applied in the address period is driven in this way to make the difference in the wall charges generated when addressing more precise. You can do

Although the technical spirit of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

According to the present invention, in the PDP driving method, it is possible to increase the brightness of the PDP by reducing the time of the selection period and increasing the time of the holding period by simultaneously addressing two pieces of data in which the pulse widths of the data pulses are adjusted. The reduction in color contrast due to the reset discharge can be improved.

Claims (5)

In the driving method of a three-electrode surface discharge PDP, a frame is driven by dividing one frame into a plurality of subfields to display an image on the three-electrode surface discharge PDP, and each subfield is divided into a reset section, an address section, and a sustain section. In A first step of sequentially applying two-bit data of the consecutive subfields to one scan pulse during addressing so that wall charges formed on the scan electrodes are different from each other; And A second step of sequentially applying two consecutive holding pulse groups having weights having different voltage levels in the holding section; 3 electrode surface discharge PDP driving method comprising a. The method of claim 1, Wherein the 2-bit data is addressed simultaneously by adjusting the duration of a data pulse applied from the data electrode. The method according to claim 1 or 2, And a data voltage corresponding to the two bits of data is formed differently. The method of claim 1, And a voltage difference between the scan pulses in synchronization with the two-bit data. The method of claim 1, 3. The method of driving a three-electrode surface discharge PDP according to claim 1, wherein the converted data is applied through a data converter when the two-bit data is simultaneously addressed by adjusting the duration of the data pulse applied from the data electrode.