KR100614407B1 - Plasma display panel - Google Patents

Abstract

 Two substrates spaced at regular intervals to form a sealed space with the surrounding sealing material, a partition wall installed to separate the spaces between the two substrates, an address electrode formed on one of opposing surfaces of the two substrates, and the opposite of the two substrates A display electrode, a scan electrode, and a discharge gas and a phosphor filled in a space, formed on any one of the planes, parallel to each other, and each cell divided by a partition wall forms a quadrangular plane, and the cells are arranged horizontally in a row In the plasma display panel in which the pixels are arranged in three units so that the cells form a triangle in two columns positioned above and below, the three cells are arranged at positions where three cells arranged to form a pixel for each pixel meet each other. Disclosed is a plasma display panel comprising a center cell having a connection passage therebetween.

According to the present invention, by changing a part of the SDR barrier rib structure, the luminance and luminous efficiency, which is pointed out as a weak point compared to the CRT, can be remarkably improved compared to the conventional plasma display panel without changing the electrode structure, and the phosphor composition and the phosphor characteristics of the center cell To increase color reproducibility and facilitate color adjustment.

Description

Plasma Display Panel {Plasma display panel}

1 is a plan view illustrating a partition wall of a segmented electrode in delta color arrayed in rectangular sub-pixel (SDR) structure in a conventional plasma display panel;

2 is a plan view showing a partition structure in the plasma display panel of the present invention;

3 is a partially enlarged plan view showing in more detail a partition structure and an electrode arrangement in one pixel of FIG. 2;

4 is a plan view showing a pixel partition structure and an electrode arrangement in another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10,10 ': bulkhead 51,61: bus electrode

53,63: transparent electrode 80,80 ': address electrode

90,90 ': center cell

The present invention relates to a plasma display panel, and more particularly, to the shape and arrangement of partition walls and electrodes of a plasma display panel.

Plasma display panels are formed by forming electrodes on two opposing substrates, overlapping them at regular intervals, injecting a discharge gas therein, and sealing the plasma display panel (PDP). Refers to a flat panel display device. The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

Plasma displays can be formed thinner than Cathode ray tube (CRT) displays, which occupy a large volume, and thus are suitable for realizing a large screen with a relatively small volume. In addition, the plasma display device does not need to form an active element such as a transistor as compared to other flat panel display devices such as LCDs, and has a general characteristic of wide viewing angle and high luminance.

In the plasma display panel, many pixels for displaying a screen are arranged in a matrix form. In the plasma display panel, each pixel is driven in a manner of simply applying a voltage to an electrode, that is, a passive matrix method, without an active element for driving the pixel. The plasma display panel may be classified into a direct current type and an alternating current type according to the type of the voltage signal for driving each electrode, and may be divided into an opposing type and a surface discharge type according to the arrangement of the two electrodes to which the discharge voltage is applied.

In the case of the direct current type, the electrode is exposed to the discharge space so that current flows through the electrode as it is from the space. Therefore, in the direct current type, it is troublesome to form a separate resistor connected to the electrode in order to protect the electrode and control the current. On the other hand, in the case of an alternating current type, since the electrode is covered with a dielectric layer, the electrode naturally has a capacitance, the current flowing through the electrode is limited, and the electrode is easily protected from the ion shock during discharge. As a result, the electrode lifetime is also long.

In a typical AC surface discharge plasma display panel, a plurality of address electrodes are formed in parallel with each other in the surface discharge plasma display panel inside one of two substrates. The display electrode and the scan electrode, which may be collectively referred to as sustain electrodes inside the same substrate or another substrate, are alternately formed horizontally in parallel with each other. The display electrodes are commonly connected to each other at one side of the panel. Each cell constituting the pixel includes an address electrode, which is one vertical electrode, and a scan electrode and a display electrode, which are two horizontal electrodes, to cross each other when viewed from above. In the top-emitting plasma display device, the sustain electrode of the cell may be formed as a transparent electrode so that the sustain electrode does not interfere with the optical path, and the transparent electrode may be horizontally connected by a bus electrode having good conductivity and a narrow width.

On the other hand, the arrangement of pixels, often referred to as a matrix form, is specifically made by formation of barrier ribs and electrodes. The partition wall may be formed in a stripe shape having a straight line only in the column direction along with the address electrode, or in a lattice shape that partitions one cell in the row direction and the column direction. In a stripe-type barrier rib structure, adjacent cells of the panel are arranged longitudinally, on one straight line. This structure has the advantage that the process of forming the partition wall is simple, but there are limitations in the arrangement of the holding electrodes to prevent cross talk between the upper and lower cells. That is, the spacing between the bus electrodes in the adjacent sustain electrodes among the up and down discharge cells among the sustain electrodes in the cell must be more than a certain gap than the gap between the opposing transparent electrodes in the discharge cell. Therefore, the discharge area is reduced to maintain the gap between the bus electrodes, and the discharge efficiency and the light emission efficiency are also lowered.

As a method for increasing luminous efficiency, which is one problem of a plasma display panel, Korean Patent Application No. 2001-3511 discloses a segmented electrode in Delta color arrayed in which three-color subpixels of a rectangle forming a pixel are arranged in a triangle as shown in FIG. Rectangular sub-pixel) structure is described. In the SDR structure, since the bus electrodes 51 and 61 of the sustain electrode may be disposed to overlap with the partition walls 10 formed laterally, the partition wall 10 prevents cross talk of the upper and lower discharge cells without any decrease in the aperture ratio. The electrode can be arranged to increase the area and to increase the discharge efficiency.

However, in spite of such arrangement, it is required to increase the luminous efficiency because the luminous efficiency of the plasma display panel is lower than that of the CRT which is in competition with the plasma display panel.

The present invention is to reduce the problem that the luminous efficiency is relatively lower than the CRT in the conventional plasma display panel described above, and provides a plasma display panel having a barrier rib and an electrode structure that can improve the luminous efficiency compared to the conventional plasma display panel. It aims to do it.

An object of the present invention is to provide a plasma display panel capable of increasing the brightness of a bright part, improving the luminance, and efficiently controlling the color.

The present invention for achieving the above object is any one of two substrates spaced apart at regular intervals to form a space sealed with the surrounding sealing material, partitions installed to separate the space between the two substrates, the opposite surface of the two substrates An address electrode formed in one, a display electrode and a scan electrode formed on one of opposing surfaces of two substrates and parallel to each other, and a discharge gas and a phosphor filled in the space;

Each cell divided by the partition wall forms a quadrangular plane, the cells are arranged horizontally in succession to form a column, and the pixels are arranged in three units so that the cells form a triangle in two columns located above and below the plasma. In the display panel,

A central cell having a connection path with each of the three cells is provided at a position where three cells arranged to form the pixel meet each pixel.

In the present invention, the three cells may form a state in which three phosphors overlap or are mixed, but a white phosphor may be installed as a single phosphor.

In the present invention, the central cell may be formed in various forms such as a circle, a square, and a triangle by a partition, and may be made by removing a partition of a portion where three cells forming a pixel meet without forming a separate partition. In this case, however, since the mutual interference between adjacent cells through the center cell may be severe, it is desirable to reduce the area. The central cell may typically consist of a smaller area than the unit cells of the three neighboring quadrangles forming the pixel.

In the present invention, the size of the center cell partitioned by the partition wall and the width of the connection between the center cell and the neighboring 3 cells, i.e. the size of the part without the partition wall, may be at least some degree of gray scale, for example, at least half of the gray scale. It can be formed so that the discharge is made bright only when the discharge is made.

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

FIG. 2 is a plan view schematically illustrating a state in which pixels are formed by a partition in a part of a panel forming a screen in one embodiment according to the present invention. FIG. 3 is a view illustrating three unit cells forming each pixel in an embodiment according to the present invention. And a plan view showing a circular center cell positioned in the center of the unit cells and an electrode structure therefor.

2 and 3, each cell is basically quadrangular. In the upper row and the lower row, the cells are not aligned correctly in a straight line, but are shifted by 1/2 pitch. As a result, one pixel positioned between two adjacent cells of the upper row and the middle of these two cells in the lower row is arranged in an isosceles triangle to form one pixel. This structure is a typical SDR structure, but in the present invention, one central cell 90 is formed where these three cells abut each other. As a result, each cell arranged in a triangular shape does not form an exact quadrilateral and becomes a quadrangular with a broken corner. The center cell 90 may be formed in a circular shape, but in addition, the center cell 90 may be formed of a polygon of a quadrangular shape or a reduced size of three cells of one pixel. The circular bulkhead is removed in the middle of the boundary area with each cell.

On the other hand, the electrode of the panel is formed as in the conventional conventional SDR structure. That is, the address electrode 80 is provided so as to overlap a straight line connecting the vertically formed portions of the partition wall 10. The bus electrodes 51 and 61 of the sustain electrodes are formed to overlap the partition walls 10 formed laterally. The transparent electrodes 53 and 63 divided into two in each cell are connected to the bus electrodes 51 and 61 at the top or bottom of the cell, respectively, and have a constant gap therebetween. Therefore, a separate transparent electrode or other electrode structure for the center cell 90 is not formed, but a portion of the address electrode 80 and the sustain electrode formed for the adjacent cell overlap with each other in the center cell 90 region.

Since the circular partition wall constituting the center cell 90 is not formed in the middle portion of the boundary between each cell and the center cell, the diffusion of discharge between the center cell 90 and the adjacent cell is prevented through the part without the partition wall 10. Can be done. The wider the portion without the partition 10, the easier the diffusion of the discharge. Therefore, in order to cause the center cell to discharge only when all three neighboring cells discharge, the width of the portion without the partition wall 10 should be adjusted to be appropriately narrow.

The phosphor of the center cell may be made of a white phosphor, and on the other hand, it is also possible for the center cell to have a portion of the same phosphor as the phosphor of the surrounding cell. In this case, each phosphor may be applied little by little to three zones of the center cell, and it is also conceivable that each phosphor is applied in three layers in all zones. Alternatively, the three phosphors may be mixed in an appropriate ratio to apply the phosphor to the center cell separately from the adjacent cells.

In plasma displays, white is usually achieved by combining RGB tricolor. In addition, it is not easy to reproduce accurate white color on the screen due to different efficiency or different properties of phosphors corresponding to each color. In order to reproduce the white color in the checkerboard cell arrangement, fabrication of an asymmetric discharge cell that forms a cell area of each color differently is also attempted. However, in order to form a partition wall peculiar to SDR, it is necessary to keep the size and aspect ratio of each cell constant. That is, an asymmetrical configuration in which the area is different for each color in the discharge cell is difficult to be considered in the SDR partition wall structure.

In this case, it may be possible to adjust the characteristics of the phosphor applied to the central cell for proper reproduction of white color while maintaining the size and aspect ratio of each cell. That is, the discharge cells arranged in a triangular to form a pixel is discharged in the same way, and in order to reproduce the white, the central cell may be provided with a phosphor that gives off the color to achieve a white color when discharged from three peripheral cells.

Therefore, when the discharge is made to the center cell only in the bright screen in which the discharge is performed in the three surrounding discharge cells, the discharge is diffused in the neighboring cells in the bright screen so that the center cell is bright and the brightness is much greater. On the contrary, in the case of a dark cell, the center cell is hardly discharged. As a result, the difference in brightness between the bright and dark pixels in the pixel becomes large, and the contrast ratio becomes large. However, even in a frame in which all three discharge cells are discharged, when the grays of the three discharge cells are dark, it is necessary to prevent the discharge from occurring in the center cell. In this case, for example, the discharge may be performed in the center cell only at a brightness of at least 128 or more at 256 gray levels. Alternatively, light emission may be caused by discharge in the center cell only when discharge occurs in three adjacent discharge cells for each subfield forming one frame.

When white color is difficult to reproduce in the SDR structure, the white color can be easily reproduced on a bright screen by an auxiliary adjustment action of the center cell.

FIG. 4 is a diagram showing a barrier rib and an electrode structure of one pixel in another embodiment of the present invention. FIG.

In FIG. 4, unlike in FIG. 3, the address electrode 80 ′ is narrowly formed at an overlapping portion of the barrier rib 10 ′ formed vertically, and wide at the center of the cell in which the phosphor is installed to facilitate address discharge. On the other hand, the partition wall constituting the central cell 90 'is made of a square rather than a circle. Although not shown, the center cell may be formed of a polygonal shape such as a pixel. The pixelated polygon may have the same shape and constant accumulation as the pixel in which neighboring cells are combined. At this time, it is preferable that the center cell is formed to be 1/2 or less of the size of each discharge cell of the pixel.

According to the present invention, by changing a part of the SDR barrier rib structure in the plasma display panel, luminance and luminous efficiency, which is pointed out as a weak point compared to the CRT, can be remarkably improved compared to the conventional plasma display panel without changing the electrode structure.

On the other hand, it is possible to increase the color reproducibility and to easily control the color by adjusting the phosphor composition and the phosphor property of the central cell.

Claims (9)

Two substrates spaced at regular intervals to form a sealed space together with a surrounding sealing material, a partition wall installed to separate the spaces between the two substrates, an address electrode formed on one of opposing surfaces of the two substrates, and A display electrode and a scan electrode formed on one of opposing surfaces of the two substrates and parallel to each other, a discharge gas and a phosphor filled in the space; Each cell divided by the partition wall forms a quadrangular plane, the cells are arranged horizontally in succession to form a plurality of columns, and the pixels are arranged in three columns such that the cells form a triangle in two columns located above and below the columns. In a plasma display panel arranged in units, And a center cell having a connection path with each of the three cells at a position where the three cells arranged to form the pixel are in contact with each other. The method of claim 1, And a phosphor provided in the central cell is a single white phosphor. The method of claim 1, The phosphor is installed in the central cell, wherein the three-color phosphors installed in the neighboring cells are divided into regions, overlapped in layers, or mixed with each other. The method of claim 1, And the center cell is formed of one of a circle, a rectangle, and a triangle by the partition wall when the connection cell is overlooked in a plan view. The method of claim 1, And the center cell is shaped like a pixel formed by combining the three surrounding cells. The method of claim 1, And wherein the central cell is formed of a phosphor different from the three cells without forming the partition wall in a partial region including the point where the three cells are in contact with each other. The method according to any one of claims 1, 5 and 6, And the center cell has a smaller area than the surrounding three cells. The method of claim 1, And the width of the connection passage is such that light can be induced by the discharge in the center cell only when discharge is generated in all three cells around the center cell. The method of claim 1, And the phosphor of the center cell is provided to be closest to the whitest when the three cells and the center cell are discharged together.

Images