KR19990065917A - Plasma display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plasma display device, and more particularly, to provide a structure that prevents luminance decrease caused by a distance difference between a center of a substrate and a peripheral part by improving image uniformity on an entire surface of a plasma display panel (PDP). have.

In order to realize this, in the present invention, a plurality of electrodes are formed on a substrate, and partition walls are formed to be parallel to the electrodes between the electrodes, and phosphors of R, G, and B are sequentially applied to each of the partition walls. In the substrate structure in which R, G, and B form unit pixels, the width of each unit pixel was gradually increased from the center of the panel toward the periphery.

Description

Plasma display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly, to a three-electrode surface discharge plasma display panel for increasing luminance by controlling the interval between pixels displaying an image by ultraviolet radiation in a corresponding discharge space during discharge of each cell. It is about.

A typical three-electrode surface discharge color PDP is composed of an upper structure and a lower structure as shown in FIG. 1 (illustrated by turning the upper electrode by 90 degrees for clarity). The upper structure includes the upper substrate 15 and the first structure. The second base layer 16, a plurality of sustain electrodes 17 located on the same plane of the second base layer 16, and a dielectric layer 18 for holding surface charges generated during discharge of the sustain electrode 1; ) And a protective layer 20 for preventing damage to the dielectric layer.

The lower structure includes a lower substrate 10, a first base layer 11 that prevents the electrode material from penetrating into the lower substrate 10 during firing, and a lower electrode formed on an upper surface of the first base layer 11. 12), a partition 13 for preventing crosstalk between discharge cells adjacent to the lower electrode 12, and a phosphor 14 coated on the partition 13 surface. .

Cells formed at a point where the sustain electrode 17 and the lower electrode 12 cross each other form one plasma display panel (PDP).

In such a conventional discharge cell, when an initial voltage is applied to all of the discharge cells on the panel between both ends of the sustain electrode 17, a discharge occurs to erase the charges formed on the partition wall 13 or the dielectric layer 18 surface. All the discharge cells have a uniform distribution of charge. That is, no charge is retained on the inner surface of the discharge space.

During addressing, when an address voltage is applied to cells to be discharged, a discharge occurs between the lower electrode 12 and the sustain electrode 17 to which the scan voltage is applied. At this time, wall charges are formed on the surface of the protective layer 20 by discharge.

Next, in the sustain period, discharge continues to occur in the cells in which wall charge is formed. On the other hand, in a cell where no wall charge is formed, it cannot be discharged even when a sustain voltage is applied. In the discharged cell, ultraviolet rays are emitted as the discharge gas injected into the corresponding discharge space is ionized to electrons and ions, As a result, the surrounding R, G and B phosphors 14 are excited to emit visible light, and when the visible light is emitted to the outside, the image display can be recognized from the outside.

However, as shown in FIG. 2, the light emission of the cell causes a difference in the distance from the viewing position O to the center C and the periphery S of the screen, that is, the recognition distance is farther away. There is a problem that is aggravated toward the large or wide PDP.

The present invention has been invented to solve the problems of the prior art as described above, by gradually increasing the width of each unit pixel formed by gathering one R, G, B from the center of the substrate toward the periphery, The purpose is to provide a substrate structure that can minimize the change in brightness felt.

1 is a cross-sectional view of a typical electrode.

2 is an image recognition distance state diagram according to a substrate position.

3 is a cross-sectional view of a lower substrate constituting a unit pixel;

4 is a view showing a change in the partition wall spacing of the substrate to which the present invention is applied.

*** Explanation of symbols for the main parts of the drawing ***

100: base layer 101: lower substrate

102: lower electrode 103: partition wall

104: phosphor

The present invention will be described in detail below with reference to the accompanying drawings.

First, as shown in FIG. 3, a plurality of lower electrodes 102 are formed on the lower substrate 101 to which the base layer 100 is coated, and a partition wall parallel to the electrodes is formed between the electrodes 102. 103 is formed, and the phosphors 104 of R, G, and B are sequentially coated on the surfaces of the partitions 103, and in the substrate structure in which one R, G, and B are formed to form a unit pixel. The width (a) of each unit pixel was formed to gradually increase from the center of the panel (C) to the periphery (S) as shown in FIG.

In order to implement such a structure, the spacing between the partition walls gradually increases toward the peripheral portion S based on the unit pixel width a, and accordingly, the spacing between the lower electrodes 102 also increases toward the substrate peripheral portion on the same basis as the partition walls. do.

That is, since phosphors coated in a stripe type between partition walls are arranged in order of R, G, and B sequentially, when three phosphors are used as one unit pixel, the spaces between the partition walls are kept the same within the same unit pixel. The width of the three phosphors increases toward the unit pixel, thereby controlling the luminance change.

As a result, by adjusting the unit pixel width (a) to prevent the decrease in brightness, it is possible to improve the reliability of the product by improving the uniformity, which is the uniformity of image display in the entire panel.

As described above, the substrate structure of the present invention improves the uniformity of the image signal appearing between the central portion and the peripheral portion of the entire surface of the substrate by the phosphor emission, thereby preventing the degradation of the luminance of the product.

Claims (2)

A plurality of electrodes are formed on the substrate, and partition walls parallel to the electrodes are formed between the electrodes, and phosphors of R, G, and B are sequentially applied to each of the partition walls, and one R, G, B is In the substrate structure of unit unit pixel, And the width of each unit pixel is gradually increased from the center of the panel toward both ends. The method of claim 1, The width of the barrier rib is maintained constant throughout the entire surface, and the width of the unit pixel is increased by changing the distance between the barrier ribs.