KR20060007673A - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel which can improve the discharge efficiency and improve the jitter characteristic during discharge by forming the address electrode in a structure matching the structure of the transparent electrode.

The plasma display panel of the present invention includes a front substrate on which scan electrodes and sustain electrodes are formed, a rear substrate on which address electrodes arranged to intersect the scan electrodes and sustain electrodes are formed, and partition walls formed to partition discharge cells on the rear substrate. In the plasma display panel, the scan electrode and the sustain electrode each comprise a transparent electrode and a bus electrode, and the area of the address electrode in the discharge cell is larger than the maximum area of the transparent electrode.

Plasma display panel, address electrode, transparent electrode, jitter characteristics, discharge efficiency, wall charge

Description

Plasma Display Panel

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

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

3 is a view for explaining a method of implementing image gradation of a conventional plasma display panel.

4A to 4C illustrate electrode structures in discharge cells of a conventional plasma display panel.

5 is a view conceptually illustrating a distribution of wall charges in a transparent electrode during discharge in a discharge cell of the plasma display panel of FIG. 4A;

6A illustrates another electrode structure in a discharge cell of a conventional plasma display panel.

6B conceptually illustrates an electric field formed in the discharge cell of FIG. 6A.

7A to 7C illustrate electrode structures in discharge cells of the plasma display panel according to the present invention.

FIG. 8A is a view conceptually illustrating a distribution of wall charges in a transparent electrode during discharge in a discharge cell of the plasma display panel of FIG. 7A; FIG.

FIG. 8B is a view conceptually illustrating a distribution of wall charges in a transparent electrode during discharge in a discharge cell of the plasma display panel of FIG. 7C; FIG.

<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 plasma display panel for improving the structure of an address electrode to increase luminous efficiency.

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.

2 is a diagram illustrating an electrode structure of a conventional plasma display panel. As shown, the electrode structure of the plasma display panel is formed by the transparent electrode and the bus electrode arranged in a stripe on the front substrate, the address electrode 22 is a rear substrate (not shown) in the direction crossing the transparent electrode and the bus electrode Is formed.

A method of implementing image gradation of the plasma display panel having such a structure is as shown in FIG. 3.

3 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.

Meanwhile, in the conventional plasma display panel, in order to increase discharge efficiency, transparent electrodes are formed in various types of structures, and the electrode structures thereof will be described with reference to FIGS. 4A to 4C.

4A to 4C are diagrams illustrating an electrode structure in a discharge cell of a conventional plasma display panel.

First, in the electrode structure of FIG. 4A, the rectangular transparent electrode 11a is formed on the front substrate, and the rectangular transparent electrode 11a is positioned at both points where the bus electrodes 11b are formed in the discharge cell, respectively. They are made to face each other with their centers in between. In addition, the address electrode 22 corresponding thereto intersects with the bus electrode 11b and the transparent electrode 11a while being spaced apart by a predetermined distance with the discharge electrode and the bus electrode 11b and the transparent electrode 11a interposed therebetween. Is done.

In the plasma display panel having such an electrode structure, when discharging, the address electrode 22 serves as a guide for wall charge. At this time, the width in the vertical direction in the discharge cell of the transparent electrode 11a is wider than the width in the vertical direction of the address electrode 22 so that the portion of the transparent electrode 11a is not guided by the address electrode 22, that is, does not contribute to the discharge. There is a problem that the discharge efficiency is lowered because there are many areas that cannot be. In addition, such an electrode structure has a problem that the jitter characteristic, which is a discharge characteristic between address electrodes, is deteriorated.

In the electrode structure of FIG. 4B, the 'T' shaped transparent electrode 11a is formed on the front substrate, and the 'T' shaped transparent electrode 11a is positioned at both points where the bus electrode 11b is formed in the discharge cell. Thus, the centers of the discharge cells face each other. In addition, the address electrode 22 corresponding thereto intersects with the bus electrode 11b and the transparent electrode 11a while being spaced apart by a predetermined distance with the bus electrode 11b and the transparent electrode 11a interposed therebetween. Is done.

In the plasma display panel having the 'T'-shaped transparent electrode structure, the ratio of the guided portion of the transparent electrode 11a guided by the address electrode 22 increases significantly, that is, the effective discharge area ratio of the transparent electrode 11a. This greatly increases and the discharge efficiency is improved. However, such a 'T'-shaped transparent electrode structure has a problem in that the absolute area of the transparent electrode 11a is reduced, so that the wall charge formation is insufficient compared to other electrode structures, thereby reducing the absolute luminance value. (Jitter) There is a problem that the characteristics deteriorate.

In the electrode structure of FIG. 4C, the polygonal transparent electrode 11a is formed on the front substrate, and the polygonal transparent electrode 11a has the center of the discharge cell at both points where the bus electrode 11b in the discharge cell is formed. The polygonal transparent electrodes 11a are positioned to face each other, and the width of the vertical direction in the discharge cells gradually increases toward the center of the discharge cells while one surface thereof is in contact with the bus electrodes 11b. It is made to remain constant after a predetermined point. In addition, the address electrode corresponding thereto is formed to intersect the bus electrode 11b and the transparent electrode 11a while being spaced apart by a predetermined distance with the bus electrode 11b and the transparent electrode 11a interposed therebetween.

The plasma display panel having the polygonal transparent electrode 11a has a lower discharge efficiency than the case of FIG. 4B because the peripheral portion of the transparent electrode 11a is not guided by the address electrode 22 during discharge. On the contrary, an increase in the absolute area of the transparent electrode 11a has improved jitter characteristics and high absolute luminance values compared to the case of FIG. 4B.

FIG. 5 is a diagram conceptually illustrating a distribution of wall charges in the transparent electrode 11a during discharge in the discharge cells of the plasma display panel of FIG. 4A. Referring to FIG. 5, the wall in the transparent electrode 11a is a portion which is not guided by the address electrode 22 on the transparent electrode 11a during discharge in the discharge cell of the plasma display panel having the rectangular transparent electrode 11a. It can be seen that the charges are not evenly distributed, that is, the distribution of the difficulty of wall charges is large. As a result, the discharge efficiency of the discharge cells in the plasma display panel may be reduced, and the jitter dispersion characteristics may be increased.

In order to solve this problem, the address electrode 22 is formed to have a width larger than the maximum vertical width of the transparent electrode 11a at the center of the discharge cell, which is shown in FIG. 6A.

6A is a view illustrating another electrode structure in a discharge cell of a conventional plasma display panel. As shown in the drawing, a rectangular transparent electrode 11a is positioned on both sides of the discharge cell on the front substrate, and the address electrode 22 has a vertical width larger than the maximum vertical width of the transparent electrode 11a at the center of the discharge cell. It is formed to be. This electrode structure causes an increase in the effective area of the transparent electrode 11a. However, in the plasma display panel having such an electrode structure, a problem arises in that the discharge contact pressure increases during discharge in the discharge cell.

6B is a view conceptually illustrating an electric field formed in the discharge cell of FIG. 6A. Referring to FIG. 6B, the address electrode 22 shown in FIG. 6B when driven in the discharge cell of the plasma display panel is more than the electric field generated during the discharge in the discharge cell of the plasma display panel having the electrode structures of FIGS. 4A, 4B, and 4C. It can be seen that the strong electric field is formed, and the strong electric field thus formed distorts the electric field generated by the transparent electrodes 11a acting on each other. As a result, the discharge voltage increases during the discharge of the plasma display panel.

In particular, when the content of xenon (Xe) in the discharge cell is increased in order to increase the discharge efficiency of the plasma display panel, the distribution of difficult acid such as wall charges in the transparent electrode 11a by the address electrode 22 when the discharge cell is discharged It is increased to increase the efficiency of xenon gas.

Accordingly, an object of the present invention is to provide a plasma display panel which can improve discharging efficiency by reducing the distribution of difficult acid distribution of wall charges in a transparent electrode.

In order to achieve the above object, the present invention provides a front substrate having a scan electrode and a sustain electrode formed thereon, a rear substrate having an address electrode arranged to intersect the scan electrode and the sustain electrode formed thereon, and formed to partition the discharge cell on the rear substrate. In the plasma display panel including a partition wall, the scan electrode and the sustain electrode are formed of a transparent electrode and a bus electrode, respectively, and the area of the address electrode in the discharge cell is larger than the maximum area of the transparent electrode. do.

The address electrode has a constant width in the longitudinal direction in the discharge cell in the center direction at both points of the discharge cell, but gradually decreases after a predetermined point, and is smaller than the width of the transparent electrode in the center of the discharge cell. At this time, the transparent electrode is characterized in that the rectangular shape which is located at both points of the discharge cell.

The address electrode gradually increases in the longitudinal direction in the discharge cell toward the center at both points in the discharge cell and remains constant after a predetermined point, and at the center of the discharge cell is smaller than the maximum longitudinal width of the transparent electrode. It is a shape that is kept constant, wherein the transparent electrode is characterized in that the 'T' shape is located at both points of the discharge cell.

In addition, the address electrode gradually increases in width in the longitudinal direction in the discharge cell toward the center at both points of the discharge cell and remains constant after the first predetermined point, and gradually decreases after the second predetermined point, and discharge cell. In the center of the shape is smaller than the width of the maximum longitudinal direction of the transparent electrode is kept constant, wherein the transparent electrode is characterized in that the polygon is located at both points of the discharge cell.

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

7A to 7C are diagrams illustrating electrode structures in discharge cells of the plasma display panel according to the present invention.

First, in the electrode structure shown in FIG. 7A, the transparent electrode 11a is formed on the front substrate in a rectangular structure, and the transparent electrode 11a of the rectangular structure is formed at both points at which the bus electrode 11b in the discharge cell is formed. They are positioned to face each other with the center of the discharge cell in between. In addition, the address electrode 22 corresponding thereto has an area larger than that of the transparent electrode 11a in the discharge cell. Preferably, the width of the vertical direction in the discharge cell is equal to both sides of the discharge cell of the plasma display panel. At the point, it has a rectangular shape larger than the width in the longitudinal direction of the transparent electrode 11a, and from the predetermined points A and A`, its width gradually decreases in the center direction, and at the center of the discharge cell, in the longitudinal direction of the transparent electrode 11a. It is made smaller than the width of.

In the plasma display panel having such an electrode structure, when discharging, the address electrode 22 serves as a guide for wall charge. At this time, the width of the vertical direction of the address electrode 22 in the discharge cell is wider than the width of the vertical direction of the square transparent electrode 11a and is guided by the address electrode 22 of the transparent electrode 11a. The missing part is greatly reduced and the discharge efficiency is increased. This electrode structure also improves the jitter characteristic, which is the discharge characteristic between the address electrodes 22.

In the electrode structure shown in FIG. 7B, the transparent electrode 11a is formed on the front substrate in a 'T' shape, and the transparent electrode 11a having the 'T' shape is formed on both sides of the bus electrode 11b in the discharge cell. Located at each point, the supporting portion is in contact with the bus electrode (11b), the head portion is made to face each other with the center of the discharge cell in between. The address electrode 22 corresponding thereto has a larger area than that of the transparent electrode 11a in the discharge cell. Preferably, the bus electrode 11b in the discharge cell has a vertical width in the discharge cell. At both points, the trapezoidal shape is larger than the transparent electrode 11a and its width gradually increases toward the discharge cell center direction, and after the predetermined points B and B`, that is, the trapezoidal discharge cell center direction. The width of the transparent electrode 11a is larger than the longitudinal width of the transparent electrode 11a from both ends of the transparent electrode 11a. ) Is made smaller than the longitudinal width.

It is noted that the plasma display panel having the 'T'-shaped transparent electrode type electrode structure is a structure for fully utilizing the guide effect of the address electrode 22.

In the electrode structure shown in FIG. 7C, the transparent electrode 11a is formed on the front substrate in a polygonal structure, and the transparent electrode 11a having such a polygonal structure is positioned at both points where the bus electrode 11b in the discharge cell is formed. The transparent electrode 11a has a polygonal shape, for example, a hexagonal shape, one surface of which is in contact with the bus electrode 11b, and a width in the vertical direction gradually increases in the discharge cell center direction after a predetermined point. It is to be maintained. In addition, the address electrode 22 corresponding thereto has a larger area than the area of the transparent electrode 11a in the discharge cell. Preferably, the width of the vertical direction in the discharge cell is positioned so that the bus electrode in the discharge cell is located. At both points, it is larger than the longitudinal width of the transparent electrode 11a and has a trapezoidal shape that gradually increases in width toward the center of the discharge cell. After the first predetermined point C, C`, that is, the trapezoidal discharge From both ends in the direction of the cell center, the width thereof is larger than the vertical width of the transparent electrode 11a, and is rectangular after the second predetermined points D and D`, that is, the center of the discharge cell of the rectangular shape. From both ends in the direction, the width thereof becomes a trapezoidal shape which gradually decreases, and from both ends of the trapezoidal discharge cell center direction, the width is formed into a rectangular shape smaller than the width of the longitudinal direction of the transparent electrode 11a. It is.

FIG. 8A is a diagram conceptually illustrating a distribution of wall charges in a transparent electrode during discharge in a discharge cell of the plasma display panel of FIG. 7A. Referring to FIG. 8A, it can be seen that most parts of the discharge cell of the plasma display panel which are not guided by the address electrode 22 are removed from the transparent electrode 11a during discharge. Accordingly, the distribution of wall charges generated in the transparent electrode 11a by the guide electrode 22 is not received, thereby reducing jitter scattering characteristics and increasing discharge efficiency. Note that in FIG. 8A, the wall charge is not located in the transparent electrode 11a and the empty space is substantially reduced.

FIG. 8B is a view conceptually illustrating the distribution of wall charges in the transparent electrode during discharge in the discharge cells of the plasma display panel of FIG. 7C. Referring to FIG. 8B, when the discharge cells of the plasma display panel are discharged, as shown in FIG. 8A, the portion of the transparent electrode 11a not receiving the guide of the address electrode 22 disappears, and the wall charges in the transparent electrode 11a are eliminated. It can be seen that the unoccupied and empty space has been significantly reduced. Accordingly, as shown in FIG. 8A, the distribution of wall charges generated in the transparent electrode 11a is reduced by not receiving the guide by the address electrode 22, thereby improving jitter dispersion characteristics and increasing discharge efficiency. However, the wall charge in the transparent electrode 11a decreases toward the bus electrode 11b in the discharge cell as compared with the case of FIG. 8A, which is different from the transparent electrode 11a toward the bus electrode 11b. This is because the width in the longitudinal direction is reduced.

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 present invention forms an address electrode with a structure that matches the structure of the transparent electrode in the discharge cell, thereby increasing discharge efficiency and improving jitter characteristics during discharge in the discharge cell of the plasma display panel. .

Claims (7)

A plasma display panel comprising: a front substrate having a scan electrode and a sustain electrode formed thereon; a rear substrate having an address electrode arranged to intersect the scan electrode and a sustain electrode; and a partition wall formed to partition discharge cells on the rear substrate; The scan electrode and the sustain electrode are each made of a transparent electrode and a bus electrode, And the area of the address electrode in the discharge cell is larger than the maximum area of the transparent electrode. The method of claim 1, The width of the address electrode in the discharge cell is kept constant in the center direction at both points of the discharge cell, and gradually decreases after a predetermined point, and at the center of the discharge cell, the width of the address electrode is greater than that of the transparent electrode. Plasma display panel, characterized in that smaller. The method of claim 2, And wherein the transparent electrode has a rectangular shape positioned at both points of the discharge cell. The method of claim 1, The width of the vertical direction in the discharge cell gradually increases in the center direction at both points of the discharge cell and remains constant after a predetermined point, and at the center of the discharge cell, the width of the vertical electrode is greater than the width of the vertical electrode in the discharge cell. Plasma display panel, characterized in that the shape is smaller and kept constant. The method according to claim 4, The transparent electrode is a plasma display panel, characterized in that the 'T' shape located at both points of the discharge cell. The method of claim 1, The vertical width of the address electrode in the discharge cell gradually increases in the center direction at both points of the discharge cell, remains constant after the first predetermined point, and gradually decreases after the second predetermined point, And a central shape of the discharge cell, the shape of which is kept smaller than the width of the transparent electrode in the vertical direction. The method of claim 6, The transparent electrode is a plasma display panel, characterized in that the polygonal located at both points of the discharge cell.

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