KR20050108435A - Driving method of plasma display panel and plasma display device - Google Patents

Abstract

A driving method of a plasma display panel, wherein the sustain pulse is applied to an M electrode employed between the two electrode (X, Y) gaps while a sustain pulse is alternately applied to the two electrodes (X, Y) when the plasma display panel is driven. By applying a sustain short pulse having a width T2 shorter than the width T1, the priming particles inside the discharge cell, which are helpful for the discharge during the discharge inside the discharge cell, are sufficiently formed so that the low voltage XY, It is possible to improve discharge delay and discharge efficiency due to AY discharge and strong electric field effect.

Description

Plasma display panel driving method and plasma display device {DRIVING METHOD OF PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE}

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 having a four-electrode structure in which one electrode is added between electrode gaps in a conventional three-electrode method.

Recently, with the development of the information industry, consumer demand for information display devices is diversified and the demand for high quality is increasing. In the small display field, the advancement of LCD technology and the technical development of EL (Electro Luminescence) devices are accelerating, and in the large display field, various displays such as plasma display panel (PDP), large LCD projection, and digital light processing (DLP) projection Display devices are being developed.

In particular, PDP is a self-light emitting device using plasma gas discharge, and has a feature that is not found in the other devices which are comparable to CRTs in image quality and easy to large screen. That is, a flat display panel is most expected as a large display device having advantages of a large screen, a thin film, a high definition, and a wide viewing angle.

PDPs are generally divided into AC, DC, and Hybrid PDPs according to the structure and driving principle. In particular, AC and DC PDPs are divided into surface discharge type and counter discharge type according to the discharge structure. Hybrid PDPs include a Plasma-Addressed Liquid Crystal Display (PLC), which uses plasma discharge as a switching element for LCDs, and a PDP mixed with AC and DC, but AC 3-electrode PDP is mainly adopted.

1 is a cross-sectional view of a cell of a typical three-electrode plasma display panel, and FIG. 2 is an electrode arrangement diagram of a typical plasma display panel.

As shown in FIG. 1, the plasma display panel includes two glass substrates 1 and 10 facing away from each other. On the glass substrate 1, the XY electrode ITO electrode 2 and the bus electrode 3 are formed in pairs and in parallel, and the two electrodes 2 and 3 are covered with the dielectric layer 4 and the MgO thin film layer 5. have. An address electrode 9 is formed on the glass substrate 10, and the address electrode 9 is covered with a dielectric layer 8. The partition wall 6 is formed on the dielectric layer 8, and the phosphor 7 is formed on the surface of the dielectric layer 8 and on both side surfaces of the partition wall 6.

In addition, as shown in FIG. 2, the electrode of a general plasma display panel has a matrix structure of n × m. Address electrodes A1-Am are arranged in the column direction, and n rows of scan electrodes Y1-Yn and sustain electrodes X1-Xn are arranged in pairs in the row direction.

In the three-electrode structure PDP as described above, the items for determining the image quality include brightness, contrast ratio, gradation expression power, animated pseudo contour noise reduction, resolution, and the like. Improving the luminance, which is one, is very important in pursuing higher quality of the PDP. Recently, a method of increasing the Xe content in the discharge gas is used as a method of improving brightness, and the discharge start voltage of Xe is high, and in this case, stable driving of the panel is difficult due to high X-Y and A-Y discharge voltages.

The technical problem to be achieved by the present invention is to solve the problems of the prior art, a short sustain pulse to the M electrode during the sustain period in the four-electrode structure employing the electrode (M) between the two electrodes (X, Y) gap By providing a sustain short pulse, a method of driving a plasma display panel capable of increasing the panel's luminance efficiency and discharge efficiency and enabling stable driving is provided.

The driving method of the plasma display panel according to an aspect of the present invention for achieving the above object is

A plurality of first electrodes and second electrodes formed on the first substrate, respectively, and a third electrode formed between the first and second electrodes, and a second substrate crossing the first, second, and third electrodes; A method of driving a plasma display panel including a plurality of fourth electrodes formed thereon, wherein a discharge cell is formed by the adjacent first, second, third, and fourth electrodes.

In retention period,

Alternately applying a first sustain discharge pulse to the first electrode and the second electrode; And

And applying a second sustain discharge pulse narrower than a width of the first sustain discharge pulse to the third electrode.

Plasma display device according to another aspect of the present invention

First substrate,

A plurality of first electrodes and second electrodes formed on the first substrate, respectively;

A third electrode formed between the first and second electrodes,

A second substrate facing away from the first substrate,

A plurality of fourth electrodes formed on the second substrate in a direction crossing the first, second and third electrodes, and

A driving for supplying a driving voltage to the first electrode, the second electrode, the third electrode and the fourth electrode to discharge the discharge cells formed by the adjacent first, second, third and fourth electrodes; Circuitry,

The driving circuit alternately applies a first sustain discharge pulse to the first electrode and the second electrode in a sustain period;

A second sustain discharge pulse narrower than the width of the first sustain discharge pulse is applied to the third electrode.

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 present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

3 is a diagram illustrating a four-electrode PDP structure employing an M electrode according to an embodiment of the present invention.

As shown in FIG. 3, the plasma display panel includes two glass substrates 100 and 190 facing away from each other. On the glass substrate 100, the X-Y electrode ITO electrode 110 and the bus electrode 120 are paired and formed in parallel, and the two electrodes 110 and 120 are covered with the dielectric layer 130 and the MgO thin film layer 140. An address electrode 180 is formed on the glass substrate 190, and the address electrode 180 is covered with the dielectric layer 170. The partition wall 150 is formed on the dielectric layer 170, and the phosphors 160 are formed on the surface of the dielectric layer 170 and both sides of the partition wall 150. In addition, it further comprises an electrode (M) formed between the gap between the X-Y electrode.

Hereinafter, a driving method of a plasma display panel according to an exemplary embodiment of the present invention will be described with reference to FIGS. 4 and 5.

First, a driving method of the plasma display panel according to the first embodiment of the present invention will be described in detail with reference to FIG. 4.

As shown in Fig. 4, the drive waveform according to the first embodiment of the present invention includes a reset period, an address period, and a sustain period. In the plasma display panel, a scan / hold driving circuit (not shown) for applying a driving voltage to the scan electrode (Y) and the sustain electrode (X) in each period and an address driving circuit for applying a driving voltage to the address electrode (A) in each period. (Not shown) is connected. In addition, an electrode M driving circuit (not shown) for applying a driving voltage to the electrode M is connected. The driving circuit and the plasma display panel are connected to form one plasma display device.

The reset period is a period of initializing the state of each cell in order to smoothly perform an addressing operation on the cell. The addressing period is a voltage applied to a cell (addressed cell) that is turned on to select a cell that is turned on and a cell that is not turned on. This is a period of time for performing an operation of accumulating wall charges by applying. The sustain period is a period in which sustain discharge is applied to actually display an image in the addressed cell by applying a sustain pulse, and the erase period is a period in which the sustain discharge is terminated by reducing the wall charge of the cell.

In the reset period, first, a ramp voltage gradually rising from the voltage smaller than the discharge start voltage to the voltage Vset exceeding the discharge start voltage is applied to the scan electrode Y. While this ramp voltage is rising, weak discharge occurs from the scan electrode Y to the address electrode A and the sustain electrode X, respectively. That is, in general, when the voltage between the scan electrode (Y) and the address electrode (A) or between the scan electrode (Y) and the sustain electrode (X) is higher than the discharge start voltage in the discharge cell, the scan electrode (Y) and the address electrode ( Discharge occurs between A) or between scan electrode Y and sustain electrode X, with the discharge start voltage varying depending on the state of the discharge cell. By this discharge, negative wall charges are accumulated in the scan electrode Y, and positive wall charges are accumulated in the address electrode A and the sustain electrode X.

Then, when a ramp voltage gradually lowered to Vnf at a voltage lower than the discharge start voltage is applied, the sustain electrode (X) and the address electrode (A) are caused by the wall voltage formed in the discharge cell while the ramp voltage is lowered. Weak discharge occurs to scan electrode Y. This discharge partially erases wall charges formed in the sustain electrode X, the scan electrode Y, and the address electrode A, so that the state of the discharge cell is set to a state suitable for addressing.

The address period is a period in which the discharge cells to be displayed are selected from the discharge cells, and in the reset period, the wall charges are accumulated in the discharge cells to be actually displayed in each of the cells made in a state suitable for addressing. A positive voltage Va is applied to the address electrode A of the discharge cell and 0 V is applied to the scan electrode Y. Then, an address discharge occurs between the address electrode A and the scan electrode Y and between the sustain electrode X and the scan electrode Y by the wall voltage and the positive voltage Va caused by the wall charge formed in the reset period. . This discharge accumulates positive wall charges in the scan electrode Y and negative wall charges in the sustain electrode X and the address electrode A. As shown in FIG. In the discharge cell in which the wall charges are accumulated by the address discharge, the discharge is caused by the sustain pulse applied in the sustain period.

Next, in the sustain period, sustain pulses are alternately applied from the sustain electrode X to the scan electrode Y to discharge the discharge cells selected in the address period.

On the other hand, in the sustain period of the plasma display panel having the electrode structure in which the M electrode is further employed between the two electrode X and Y gaps according to the present invention, the sustain pulse is alternately applied to the scan electrode Y and the sustain electrode X. Apply. While the sustain discharge voltage is applied, a sustain short pulse is applied to the electrode M than the sustain pulse.

More specifically, while one sustain discharge pulse is applied to the scan electrode Y or the sustain electrode X, the electrode M has a pulse width T2 shorter than the width T1 of the sustain pulse voltage. Apply a pulsed voltage. In order to improve the luminance efficiency and the discharge efficiency of the panel during the sustain period, a short sustain pulse voltage is applied to the M electrode to form a strong electric field in the discharge cell, and the electrons are accelerated to move at a higher speed. As the velocity of the electrons increases, it causes a strong collision with the injected discharge gas Xe and the collided Xe particles are ionized by causing the electrons to pop out. Then, the protruding electrons are accelerated again by the electric field, and the accelerated electrons cause a chain reaction with other Xe and continue to protrude the electrons. Therefore, when sufficient time passes, almost all of the Xe particles are ionized to rapidly increase the density of priming particles in the discharge cell, thereby enabling low-voltage XY and AY discharge, improving discharge delay and improving discharge efficiency. It works.

In addition, as shown in FIG. 4, a short sustain pulse voltage according to the first embodiment of the present invention may be applied to the M electrode before the sustain period. In the above case, as described above, the density of the priming particles increases in the discharge cell, thereby increasing the discharge efficiency.

On the other hand, the number of times to apply a short pulse voltage to the M electrode during the sustain period can be selected by those skilled in the art within the scope of the object of the present invention, and also whether or not to apply a short pulse voltage to the M electrode before the sustain period You can choose by.

 Next, a driving method of the plasma display panel according to the second embodiment of the present invention will be described with reference to FIG. 5.

As shown in FIG. 5, the driving waveform of the plasma display panel according to the second embodiment of the present invention is compared with the driving waveform of the first embodiment of the present invention in applying a short sustain pulse voltage to the M electrode during the sustain period. Since the voltage of the first short sustain pulse is the same except that the voltage of the second sustain pulse is higher than that of the second sustain pulse, the description of the overlapped parts will be omitted by referring to the first embodiment of the present invention.

According to the second embodiment of the present invention, sustain pulses are alternately applied to scan electrode Y and sustain electrode X during the sustain period. While one sustain pulse is applied to the scan electrode Y or the sustain electrode X, a sustain pulse having a width T2 narrower than the width T1 of the sustain pulse voltage is applied to the M electrode. In particular, in applying a short sustain pulse to the M electrode during the sustain period, the first short sustain pulse has a voltage higher than the voltage of the successive short sustain pulses. Thus, as the high sustain voltage of the short voltage is applied inside the discharge cell, more priming particles can be produced to assist in the discharge. As described above, sufficient priming particles are formed in the discharge cell as time passes, thereby enabling low-voltage X-Y and A-Y discharge, and improving discharge delay and discharge efficiency.

Likewise, the number of times of applying a short sustain pulse voltage to the M electrode during the sustain period according to the second embodiment of the present invention can be selected by those skilled in the art within the range that satisfies the object of the present invention.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, the sustain pulse width is applied to the M electrode employed between the two electrode X and Y gaps while the sustain pulses are alternately applied to the two electrodes X and Y when the plasma display panel is driven. By applying a sustain short pulse of a width T2 shorter than T1, the priming particles inside the discharge cell are sufficiently formed to improve discharge delay and discharge efficiency due to low voltage XY, AY discharge and strong electric field effect. Can improve.

1 is a schematic partial perspective view of a typical plasma display panel.

2 is an electrode array diagram of a general plasma display panel.

3 is an electrode structure diagram of a plasma display panel according to an exemplary embodiment of the present invention.

4 is a driving waveform diagram of a plasma display panel according to a first embodiment of the present invention.

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

Claims (9)

A plurality of first electrodes and second electrodes formed on the first substrate, respectively, and a third electrode formed between the first and second electrodes, and a second substrate crossing the first, second, and third electrodes; A method of driving a plasma display panel including a plurality of fourth electrodes formed thereon, wherein a discharge cell is formed by the adjacent first, second, third, and fourth electrodes. In retention period, (a) alternately applying a first sustain discharge pulse to the first electrode and the second electrode; And (b) applying a second sustain discharge pulse narrower than a width of the first sustain discharge pulse to the third electrode; Method of driving a plasma display panel comprising a. The method of claim 1, And the voltages of the first sustain discharge pulse and the second sustain discharge pulse are substantially the same voltage. The method of claim 1, And a first pulse of the second sustain discharge pulse applied to the third electrode is greater than a second sustain discharge pulse of the second sustain discharge pulse. The method of claim 1, And any nth pulse of the second sustain discharge pulses applied to the third electrode is larger than the remaining sustain discharge pulses of the second sustain discharge pulses. The method of claim 1, And applying the second sustain discharge pulse to the third electrode before the sustain period. First substrate, A plurality of first electrodes and second electrodes formed on the first substrate, respectively; A third electrode formed between the first and second electrodes, A second substrate facing away from the first substrate, A plurality of fourth electrodes formed on the second substrate in a direction crossing the first, second and third electrodes, and A driving for supplying a driving voltage to the first electrode, the second electrode, the third electrode and the fourth electrode to discharge the discharge cells formed by the adjacent first, second, third and fourth electrodes; Circuitry, The driving circuit alternately applies a first sustain discharge pulse to the first electrode and the second electrode in a sustain period; And a second sustain discharge pulse narrower than a width of the first sustain discharge pulse to the third electrode. The method of claim 6, And a first pulse of the second sustain discharge pulse applied to the third electrode is greater than a second sustain discharge pulse of the second sustain discharge pulse. The method of claim 6, And any nth pulse among the second sustain discharge pulses applied to the third electrode is larger than the remaining sustain discharge pulses of the second sustain discharge pulse. The method of claim 6, And the second sustain discharge pulse is applied to the third electrode before the sustain period.