KR100625462B1 - Driving Method for Sustain of Plasma Display Panel - Google Patents

Abstract

The present invention relates to a sustain driving method of a plasma display panel which suppresses an increase in a discharge voltage and increases discharge efficiency during discharge by generating a counter discharge along with surface discharge in a sustain period to maintain discharge.

The present invention relates to a sustain driving method of a plasma display panel in which a sustain pulse is applied to an address electrode, a scan electrode, and a sustain electrode in a sustain period to sustain a discharge, and a counter discharge is generated between the address electrode and the scan electrode. The first step of diffusing the discharge generated between the address electrode and the scan electrode to the sustain electrode, and after the first step, a second step of generating surface discharge between the scan electrode and the sustain electrode during the sustain period It is characterized by repeating the discharge.

Plasma Display Panel, Sustain Voltage, Sustain Driving Pulse, Surface Discharge, Counter Discharge, Sustain Section, Cell Pitch, Discharge Voltage

Description

Driving method for plasma display panel {Driving Method for Sustain of Plasma Display Panel}

1 is a perspective view schematically showing the structure of a conventional plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

3 is a view showing an electrode structure of a conventional plasma display panel.

4A to 4B are diagrams for explaining discharge in discharge cells of a conventional plasma display panel;

5 is a diagram showing sustain driving pulses of a conventional plasma display panel;

6 is a view showing an example of an electrode structure in a discharge cell of a conventional plasma display panel.

7A to 7B are conceptual views illustrating wall charge distributions participating in a discharge start voltage during surface discharge in a discharge cell of the plasma display panel of FIG. 6.

FIG. 8 is a diagram conceptually illustrating a wall charge distribution participating in a discharge start voltage during counter discharge in a discharge cell of the plasma display panel of FIG. 6; FIG.

9 illustrates a sustain drive pulse of a plasma display panel according to the present invention;

10A to 10B are views for explaining the form of discharge in the discharge cell when the sustain drive pulse according to the present invention of FIG. 9 is applied.

11A to 11C are views conceptually showing a distribution of charges in a discharge cell when the sustain driving pulse according to the present invention of FIG. 9 is applied.

12A to 12B illustrate structures of transparent electrodes optimized for the sustain driving method of the plasma display panel of the present invention.

13A to 13B are views showing the structure of an address electrode optimized for the sustain driving method of the plasma display panel of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: front substrate 11a: transparent electrode

11b: bus electrode 11Y: scan electrode

11Z sustain electrode 12 dielectric layer

13: protective layer 20: rear substrate

21: partition 22: address electrode

23 phosphor 24 white dielectric layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a sustain driving method of a plasma display panel to increase discharge efficiency by generating a counter discharge and maintaining a discharge along with a surface discharge during sustain discharge.

In general, a plasma display panel (hereinafter, referred to as a 'PDP') includes a partition wall formed between a front substrate and a rear substrate of soda-lime glass to form one discharge cell. Each cell is filled with a main discharge gas such as neon (Ne), helium (He) or a mixture of neon and helium (Ne + He) and an inert gas containing a small amount of xenon (Xe). When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image.

1 is a perspective view schematically showing the structure of a conventional plasma display panel. As shown, the plasma display panel is coupled in parallel with the front substrate 10, which is the display surface on which the image is displayed, and the rear substrate 20 forming the rear surface, with a predetermined distance therebetween.

The front substrate 10 is made of a scan electrode 11Y and a sustain electrode 11Z, that is, a transparent electrode 11a formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 11Y and the sustain electrode 11Z provided as the bus electrode 11b are formed in pairs. The scan electrode 11Y and the sustain electrode 11Z are covered by one or more dielectric layers 12 which limit the discharge current and insulate the electrode pairs, and the magnesium oxide top surface of the dielectric layer 12 to facilitate the discharge conditions. A protective layer 13 on which (MgO) is deposited is formed.

The rear substrate 20 is arranged in such a manner that a plurality of discharge spaces, that is, barrier ribs 21 of stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 22 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 21. On the upper side of the rear substrate 20, R, G, and B phosphors 23 which emit visible light for image display during address discharge are coated. A white dielectric 24 is formed between the address electrode 22 and the phosphor 23 to protect the address electrode 22 and reflect the visible light emitted from the phosphor 23 to the front substrate 10.

A method of implementing image gradation of a plasma display panel having such a structure is shown in FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel. As shown in the drawing, a gray level display method of a conventional plasma display panel is driven by dividing one frame into several subfields having different number of emission times, and each subfield is again subjected to a reset period (RPD) for generating a uniform discharge. ) Is divided into an address period APD for selecting a discharge cell and a sustain period SPD for implementing gray scale according to the number of discharge times. For example, when displaying an image with 256 gray levels, a frame period (16.7 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 2, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period. The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the discharge cell is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. The sustain period is increased at a rate of 2n (n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges.

3 is a view showing an electrode structure of a conventional plasma display panel. Referring to FIG. 3, the electrode structure of the plasma display panel includes a transparent electrode 11a and a bus electrode 11b arranged in strips on a front substrate (not shown), and the address electrode 22 is formed of a transparent electrode and a bus electrode. It will be seen that the formed on the rear substrate (not shown) in the direction intersecting with.

4A to 4B are diagrams for describing discharge in discharge cells of a conventional plasma display panel. As shown in the drawing, the discharge of the conventional plasma display panel includes the address electrode 22 formed on the upper substrate 20 and the scan electrode 11Y and the sustain electrode formed side by side on the lower substrate 10 so as to intersect the address electrode 22. 11Z) in a space surrounded by the discharge cell. In order to cause the discharge in the discharge cell, the alternating sustain voltage Vs is conventionally applied to the Y electrode and the Z electrode. For example, a sustain voltage Vs is applied to the scan electrode 11Y, a voltage of ground GND level is applied to the sustain electrode 11Z, and a ground GND level is applied to the scan electrode 11Y in the next step. Is applied, and a sustain voltage Vs is applied to the sustain electrode 11Z at the same time. Here, the sustain voltage Vs means a voltage for maintaining the discharge of the cell.

The mode of discharge in the discharge cell of the conventional plasma display panel will be described with reference to FIG. 5 as follows.

First, when the sustain voltage Vs is applied to the scan electrode 11Y while the ground level voltage is applied to the address electrode 22 and the sustain electrode 11Z in the first section, for example, the scan electrode 11Y A discharge is generated, and since negative sustain voltage Vs is applied to the scan electrode 11Y, negative charges in the discharge cell are moved toward the scan electrode 11Y. This movement of negative charges is indicated by arrows in FIG. 4A. In addition, since discharge occurs on the protective layer which protects the transparent electrode 11a and the bus electrode 11b, the protective layer was shown as underline on the drawing. Hereinafter, in the drawings for describing the present specification, the protective layer is intended to be represented by such an underscore.

When the sustain voltage Vs is applied to the sustain electrode 11Z while the ground level voltage is applied to the address electrode 22 and the scan electrode 11Y in the second section, discharge by the sustain electrode 11Z occurs. In this case, since the positive potential sustain voltage Vs is applied to the sustain electrode 11Z, the negative charges in the discharge cell are moved toward the sustain electrode 11Z. The movement of these negative charges is indicated by arrows in FIG. 4B.

6 is a view showing an example of an electrode structure in a discharge cell of a conventional plasma display panel. As shown in the drawing, the electrode structures in the discharge cells of the conventional plasma display panel are located at both points where the rectangular transparent electrodes 11a are formed at both points at which the bus electrodes 11b are formed in the discharge cells. It was made to face. In addition, the address electrode 22 corresponding thereto has a width smaller than the width in the vertical direction in the discharge cell of the transparent electrode 11a, and is predetermined with the bus electrode 11b and the transparent electrode 11a interposed therebetween. In the state spaced apart by the distance is made to intersect the bus electrode 11b and the transparent electrode 11a. Here, the spacing between the transparent electrodes 11a positioned at both points at which the bus electrodes 11b are formed in the discharge cell is usually 65 μm or less.

In the plasma display panel having such an electrode structure, when discharging, the address electrode 22 serves as a guide for wall charge.

7A to 7B are conceptual views illustrating wall charge distributions that contribute to discharge voltage during surface discharge in the discharge cells of the plasma display panel of FIG. 6. 7A to 7B, it can be seen that the wall charges contributing to the discharge voltage during the surface discharge in the discharge cell of the plasma display panel are biased near the direction where the empty space between the transparent electrodes 11a in the discharge cell center direction is located. Can be. That is, it is biased to the portion indicated by an ellipse in FIGS. 7A to 7B. Accordingly, it can be seen that the area where the wall charges contributing to the discharge voltage during the surface discharge in the discharge cell of the plasma display panel is determined by the width in the vertical direction in the discharge cell of the transparent electrode 11a.

On the other hand, in recent years, in order to provide clearer image quality, for example, high definition (HD) quality, the cell pitch of the discharge cells is reduced to form more discharge cells in the same area. As a result, the cell pitch decreases, thereby reducing the area where wall charges contributing to the discharge voltage during surface discharge in the discharge cell of the plasma display panel is reduced, resulting in an increase in the discharge voltage. In addition, when the content of xenon (Xe) in the discharge cell is increased to increase the discharge efficiency of the plasma display panel, interference of the address electrode 22 with respect to the discharge between the scan electrode 11Y and the sustain electrode 11Z is prevented. This results in an increase in the discharge voltage upon discharge. In addition, even when only the area of the transparent electrode 11a is increased only for discharge efficiency, a problem arises in that the discharge voltage increases during discharge in the plasma display panel discharge cell.

FIG. 8 is a diagram conceptually illustrating a wall charge distribution contributing to a discharge voltage during counter discharge in a discharge cell of the plasma display panel of FIG. 6. Referring to FIG. 8, it can be seen that the wall charges participating in the discharge start voltage during the opposite discharge in the discharge cell of the plasma display panel are located in a region where the address electrode 22 and the transparent electrode 11a intersect in the discharge cell, for example, region A. FIG. Can be. Accordingly, in the case of counter discharge, the size of the region A where the address electrode 22 and the transparent electrode 11a intersect in the discharge cell affects the discharge voltage. Therefore, even if the cell pitch decreases slightly, if the width in the vertical direction is maintained in the discharge cell of the address electrode 22, the area where the wall charges contributing to the discharge voltage during the opposite discharge in the discharge cell of the plasma display panel is not greatly reduced. Will not. As a result, it can be seen that the discharge voltage during the opposite discharge is not significantly affected by the change in the cell pitch of the discharge cells.

As described above, the increase in the area of the transparent electrode 11a, the increase in the content of xenon (Xe) in the discharge cells, and the decrease in the cell pitch are factors that greatly increase the discharge voltage during surface discharge in the discharge cells of the plasma display panel, respectively. do. However, in the case of the opposite discharge, even if the area of the transparent electrode 11a is increased, the content of xenon (Xe) in the discharge cell is increased, or the cell pitch is decreased in comparison with the case of the surface discharge, the discharge cell of the plasma display panel During the opposite discharge, the discharge voltage rises relatively little. Accordingly, when the cell pitch of the discharge cells is reduced, more discharge cells are formed in the same area to achieve a clearer image quality, or to increase the discharge efficiency by increasing the content of xenon (Xe). If the sustain voltage can be maintained using the discharge voltage, the discharge efficiency can be increased.

Accordingly, an object of the present invention is to provide a sustain driving method of a plasma display panel which generates an opposite discharge together with a surface discharge during sustain discharge to increase discharge efficiency.

In order to achieve the above object, the present invention provides a method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. The first discharge in which the opposite discharge is generated between the electrodes, the discharge generated between the address electrode and the scan electrode is diffused to the sustain electrode, and after the first step, the surface discharge between the scan electrode and the sustain electrode The second step generated is repeated during the sustain period, characterized in that the discharge is maintained.

A sustain voltage of a predetermined magnitude and a voltage of ground (GND) level are alternately applied to the address electrode.

A negative sustain voltage and a positive sustain voltage of a predetermined magnitude are alternately applied to the scan electrode.

A voltage equal to or less than 0.5 times the amount of the sustain voltage of a predetermined magnitude and a voltage of the ground (GND) level are alternately applied to the sustain electrode.

In the first step, a positive sustain voltage of a predetermined magnitude is applied to the address electrode, a negative sustain voltage of a predetermined magnitude is applied to the scan electrode, and a counter discharge is generated, and a positive sustain voltage of a predetermined magnitude is applied to the sustain electrode. The voltage of 0.5 times or less is applied, and the discharge generated between the address electrode and the scan electrode is diffused in the direction of the sustain electrode.

In the second step, a ground (GND) level voltage is applied to the address electrode and the sustain electrode, and a sustain voltage of a predetermined magnitude is applied to the scan electrode, whereby surface discharge is generated between the scan electrode and the sustain electrode. It is characterized by.

The distance between the transparent electrodes included in each of the scan electrode and the sustain electrode is formed to be 50㎛ or less.

The address electrode spaced apart from the scan electrode and the sustain electrode by a predetermined distance has a vertical width in the discharge cell which is kept constant in the center direction at both points of the discharge cell and gradually decreases after a predetermined point. It is characterized in that the central portion is smaller than the width in the longitudinal direction of the transparent electrode.

The width of the transparent electrode included in the scan electrode is larger than that of the transparent electrode included in the sustain electrode.

The address electrode is characterized in that the address electrode in the scan electrode direction has a wider area than the address electrode in the sustain electrode direction with respect to the center of the discharge cell.

Hereinafter, a sustain driving method of the plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

9 illustrates a sustain driving pulse of the plasma display panel according to the present invention. As shown in the drawing, the sustain driving pulse according to the present invention alternately applies a negative sustain voltage (-Vs) and a positive sustain voltage (Vs) to a scan electrode formed on an upper substrate of a plasma display panel, and positively applies to an address electrode. The sustain voltage Vs and the ground (GND) level voltage are alternately applied, and a voltage (≤Vs / 2) equal to or less than 0.5 times the positive sustain voltage Vs is alternately applied to the sustain electrode. .

When the sustain driving pulse of the plasma display panel according to the present invention is applied, the discharge form in the discharge cell will be described with reference to FIGS. 10A to 10B in FIG. 9.

First, for example, in the tenth section, a negative sustain voltage (-Vs) is applied to the scan electrode (Y electrode), a positive sustain voltage (Vs) is applied to the address electrodes 22 and X electrode, and the sustain electrode Z is applied. The electrode is applied with a voltage (≤ Vs / 2) equal to or less than 0.5 times the positive sustain voltage (Vs). Here, a large opposite discharge is generated between the scan electrode to which the negative sustain voltage Vs is applied and the address electrode to which the positive sustain voltage is applied, and a voltage of Vs / 2 or less is applied to the sustain electrode so that the discharge is directed toward the sustain electrode. To spread. Referring to FIG. 10A, in the tenth section, a large opposite discharge is biased between the address electrode and the scan electrode in a direction in which the scan electrode in the discharge cell is located, and a small surface discharge is generated between the scan electrode and the sustain electrode to spread the discharge path. You can see that.

In the twentieth section, the positive sustain voltage Vs is applied to the scan electrode, and the ground (GND) level voltage is applied to the address electrode 22 and the sustain electrode. Here, the conventional surface discharge is generated between the scan electrode to which the positive sustain voltage Vs is applied and the sustain electrode to which the voltage of the ground GND level is applied. The pulses in the tenth and twentieth sections are repeatedly applied during the sustain section to maintain the discharge. Referring to FIG. 10B, it can be seen that, in the twentieth section, a surface discharge as in the prior art is generated between the scan electrode and the sustain electrode.

The distribution of charges in the discharge cells in this type of discharge is shown in FIGS. 11A to 11C.

11A to 11C are conceptual views illustrating the distribution of wall charges in a discharge cell when the sustain driving pulse according to the present invention of FIG. 9 is applied. As shown in FIG. 11A, the wall charges in the discharge cells during discharge show a large counter discharge between the scan electrodes and the address electrodes in the tenth section of FIG. 9, wherein a negative sustain voltage (-Vs) is applied to the scan electrodes. Since most of the positive charges move in the polar direction before the scan and are located near the scan electrode in the discharge cell, since the positive sustain voltage Vs is applied to the address electrode 22, most of the negative charges are in the address electrode direction. Move in the vicinity of the address electrode in the discharge cell. The negative charges are positioned to correspond to the positive charges located near the scan electrode. In addition, since a relatively low voltage (≤Vs / 2) equal to or less than 0.5 times the positive sustain voltage (Vs) is applied to the sustain electrode, a relatively small number of negative charges move toward the sustain electrode, so that the sustain electrode in the discharge cell is near. As a result, a relatively small number of positive charges are located near the address electrode so as to correspond to the negative charge located near the sustain electrode.

Referring to FIG. 11B, the surface discharge between the scan electrode and the sustain electrode occurs in the twentieth section of FIG. 9, and since the positive sustain voltage Vs is applied to the scan electrode, most of the negative charges move in the scan electrode direction to discharge the discharge cell. It can be seen that the negative charges located in the vicinity of the scan electrode and located near the address electrode by the surface discharge move in the direction of the sustain electrode in the discharge cell and are located near the sustain electrode. In addition, it can be seen that a relatively small number of positive charges are located in the vicinity of the address electrode so as to correspond to the negative charges near the scan electrode, and a relatively small number of negative charges are located so as to correspond to the positive charges in the vicinity of the sustain electrode.

Referring to FIG. 11C, it can be seen that in the thirtieth section described in FIG. 9, the charges are located in the discharge cell through the same process as in the tenth section.

The sustain driving method of the plasma display panel of the present invention described above in detail shows an improved discharge efficiency when applied to the plasma display panel having a transparent electrode of a specific structure. Looking at such an electrode structure is shown in Figure 12a to 12b.

12A to 12B are views showing the structure of a transparent electrode optimized for the sustain driving method of the plasma display panel of the present invention. First, referring to FIG. 12A, the structure of the transparent electrode optimized for the sustain driving method of the plasma display panel of the present invention is that the rectangular transparent electrode 11a is positioned at both points where the bus electrode 11b is formed in the discharge cell. It is made to face each other with the center in between. The gap between the transparent electrodes 11a is formed to be 50 μm or less.

This electrode structure is to reduce the distance between the transparent electrode (11a) to 50㎛ or less so that the discharge in the direction of the sustain electrode in the tenth section of FIG.

Referring to FIG. 12B, another structure of the transparent electrode optimized for the sustain driving method of the plasma display panel according to the present invention is that the rectangular transparent electrode 11a is positioned at both points at which the bus electrode 11b is formed in the discharge cell. It is made to face each other with the center between, and the interval between the transparent electrodes (11a) is formed to 50㎛ or less. 12A differs from the electrode structure of FIG. 12A in that the transparent electrode 11a included in the scan electrode (Y electrode) is wider in the horizontal direction than the transparent electrode 11a included in the sustain electrode (Z electrode). will be. That is, the transparent electrode 11a included in the scan electrode (Y electrode) has a larger area than the transparent electrode 11a included in the sustain electrode (Z electrode).

12A, the distance between the transparent electrodes 11a is reduced to 50 μm or less so that the discharge is further spread in the sustain electrode direction in the tenth section of FIG. 9 described above. In addition, the area of the transparent electrode 11a included in the scan electrode Y is increased to form a sufficient number of wall charges for discharge in the scan electrode Y direction in the discharge cell.

When the address electrode is formed in a specific structure corresponding to the transparent electrode structure, the discharge electrode can be further improved. The structure of such an address electrode will be described with reference to FIGS. 13A to 13B.

13A to 13B illustrate structures of address electrodes optimized for the sustain driving method of the plasma display panel according to the present invention. First, referring to FIG. 13A, the structure of the address electrode 22 optimized for the sustain driving method of the plasma display panel of the present invention is maintained at a constant width in the vertical direction at both points of the discharge cells in which the bus electrode 11b of the plasma display panel is formed. From the predetermined point (B, B`) it can be seen that the width gradually decreases in the center direction so that the center of the discharge cell is smaller than the width in the longitudinal direction of the transparent electrode (11a). In this case, the transparent electrode 11a preferably has a structure as shown in FIG. 12A.

When discharging the plasma display panel, the address electrode 22 serves as a guide for wall charge. At this time, in the electrode structure, the width of the vertical direction of the address electrode 22 in the discharge cell is wide enough so that the portion which is not guided by the address electrode 22 of the transparent electrode 11a is largely reduced. The discharge efficiency is increased.

Referring to FIG. 13B, another structure of the address electrode 22 optimized for the sustain driving method of the plasma display panel according to the present invention includes the transparent electrode 11a included in the scan electrode Y positioned with respect to the center of the discharge cell. The area of the address electrode 22 in the vicinity is wider than the area of the address electrode 22 in the vicinity where the transparent electrode 11a included in the sustain electrode Z is located. For example, the address electrode 22 has a rectangular shape in which the width in the vertical direction is kept constant from the bus electrode 11b on the scan electrode side of the discharge cell of the display panel, and the transparent electrode included in the scan electrode Y. From a predetermined point near the end of 11a, the width in the vertical direction in the discharge cell of the address electrode 22 is kept smaller than the width in the vertical direction of the transparent electrode 11a. In this case, the transparent electrode 11a preferably has a structure as shown in FIG. 12B.

In such an electrode structure, the area where the wall charges contributing to the discharge voltage during the surface discharge is located in the discharge cell of the plasma display panel, that is, the width at which the transparent electrode 11a and the address electrode 22 overlap in the vertical direction increases to discharge during discharge. Increase the efficiency

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above in detail, the sustain driving method of the plasma display panel of the present invention suppresses the increase of the discharge voltage during discharge even when the cell pitch of the discharge cell is decreased or the content of xenon (Xe) in the discharge cell is increased, When the discharge efficiency is increased.

Claims (11)

A method of driving a plasma display panel in which a plurality of subfields having different emission counts are divided into an initialization period, an address period, and a sustain period to implement an image. In the sustain period, pulses having opposite polarities are applied to the scan electrode and the address electrode, and pulses having opposite polarities and low voltages are applied to the sustain electrode and the address electrode and the scan electrode. Between the first stage causing the opposite discharge, A pulse having a polarity opposite to that of the first step is applied to the scan electrode, the sustain electrode is grounded, and the address electrode is grounded to cause surface discharge between the scan electrode and the sustain electrode; A method for driving sustain of a plasma display panel by repeating steps. The method of claim 1, The address electrode A sustain driving method of a plasma display panel, wherein a sustain voltage of a predetermined magnitude and a voltage of a ground (GND) level are alternately applied. The method of claim 1, The scan electrode A method for driving sustain of a plasma display panel, characterized in that a negative sustain voltage and a positive sustain voltage of a predetermined magnitude are alternately applied. The method of claim 1, The sustain electrode A method for driving a sustain of a plasma display panel, characterized in that a voltage of 0.5 times or less of a positive sustain voltage of a predetermined magnitude and a voltage of a ground (GND) level are alternately applied. The method of claim 1, In the first step A positive sustain voltage of a predetermined magnitude is applied to the address electrode, a negative sustain voltage of a predetermined magnitude is applied to the scan electrode, and a counter discharge is generated. The sustain electrode has a voltage equal to or less than 0.5 times the positive sustain voltage of a predetermined magnitude. And a discharge generated between the address electrode and the scan electrode is diffused in the direction of the sustain electrode. The method of claim 1, The second step is A plasma (GND) level voltage is applied to the address electrode and the sustain electrode, and a sustain voltage of a predetermined magnitude is applied to the scan electrode, thereby causing surface discharge between the scan electrode and the sustain electrode. Sustain driving method of panel. A front substrate and a rear substrate bonded to each other at a predetermined interval; A scan electrode and a sustain electrode formed on the front substrate; And An address electrode formed on the rear substrate to intersect the scan electrode and the sustain electrode; And the address electrode is formed to have a protruding portion at an intersection with the scan electrode, and a discharge gap between the scan electrode and the sustain electrode is 50 μm or less. According to claim 7, The address electrode spaced apart from the scan electrode and the sustain electrode by a predetermined distance has a vertical width in the discharge cell which is kept constant in the center direction at both points of the discharge cell and gradually decreases after a predetermined point. And a central portion smaller than the width of the transparent electrode in the longitudinal direction. According to claim 7, And the width of the transparent electrode included in the scan electrode is wider than that of the transparent electrode included in the sustain electrode. The method of claim 9, And wherein the address electrode has a wider area than the address electrode in the direction of the sustain electrode with respect to the center of the discharge cell. The method of claim 7, wherein And the address electrode is formed to have a protrusion at an intersection with the sustain electrode.

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