KR20010004345A - Barrier rib of plasma display panel and method for forming the same - Google Patents

Abstract

PURPOSE: A barrier rib of a plasma display panel and a method of forming the same are provided to increase the luminance even in a structure that a size of an aperture is fixed. CONSTITUTION: A fluorescent substance coated on an opaque layer(21A) reflects an emitted visible light(R2). A fluorescent substance coated on a transparent layer(21B) reflects the emitted visible light(R2) and makes an emitted visible light(R3) transmit therethrough. The transparent layer(21B) intercepts or absorbs an ultraviolet ray(R1). Accordingly. the transparent layer(21B) don't exceed 30 percents of a height of a barrier rib so as to prevent colors from being mixed among adjacent cells. A method of forming the barrier rib comprises the following steps. The first step is to form the opaque layer(21A) and the transparent layer(21B) on a substrate(20). The next step is to coat a dry film resist(DFR) of a sand blast. The next step is to form a DFR mask after exposing the DFR by the use of an exposing mask. The last step is to form a barrier rib pattern by selectively removing the transparent layer(21B) and the opaque layer(21A).

Description

Barrier of plasma display panel and its formation method {BARRIER RIB OF PLASMA DISPLAY PANEL AND METHOD FOR FORMING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel, and more particularly to a partition of a plasma display panel and a method of forming the same.

Plasma display panels (hereinafter referred to as PDPs) are devices that display characters or graphics using light emitted from plasma generated during gas discharge. PDP has the advantage of being most suitable for large-scale display among various flat panel displays such as liquid crystal display (LCD), field emission display (FED), and electroluminescence display (ELD) which are being actively studied.

That is, the plasma display panel can be enlarged to 40 "or more, and CRT level colorization is possible because the ultraviolet light generated by the discharge uses a photoluminescence mechanism that stimulates the fluorescent film and emits visible light. As a self-emissive display, it has many unique advantages not found in other flat panel devices such as a wide viewing angle of 160 ° or more. It is a multimedia that combines the functions of next-generation high-definition wall-mounted TV, TV, and PC. It is considered to be a large display device for use.

PDP uses two glass substrates with a thickness of about 3 mm to apply an appropriate electrode and phosphor on each substrate, and forms plasma in the space therebetween while maintaining the distance between the two substrates at about 0.1 mm to 0.2 mm. Since it is adopted, it can be enlarged as a flat plate. In addition, in the PDP, the gas discharge has a strong non-linearity in which discharge does not occur even when a voltage is applied between electrodes, and a super large panel having a memory function that is essential for driving a large display. Even in this case, a high quality image can be expressed without deteriorating the luminance.

Plasma display panels have a direct current (DC type) in which the electrode for generating plasma is directly exposed to the plasma so that conduction current flows directly through the electrode, and the electrode is covered with a dielectric and is not directly exposed. ) Is divided into the alternating current type (AC type).

A pair of parallel transparent electrodes, a bus electrode formed on the transparent electrode, a dielectric layer, and the like are formed on the front plate of the AC PDP. The back plate is formed with an address electrode perpendicular to the bus electrode, a dielectric layer, a partition formed on the dielectric layer, and a fluorescent layer formed between the partition walls. The front and back plates of such a structure are sealed and exhausted to form a PDP.

The development trend in the display field is gradually shifting from the existing video graphics array (VGA) level to the extended graphics adapter (XGA) level and the high definition television (HD TV) level. PDPs are no exception to this trend, and investments in the development of fixed-panel panels have been made in recent years.

However, due to the characteristics of the PDP, the number of cells increases as the fixed tax level increases, and thus the number of partition walls for preventing cross talk between cells increases.

Therefore, only by compensating for the aperture ratio by reducing the width of the barrier rib as much as possible to provide a high-definition screen without reducing the luminance.

The present invention devised to solve the above problems is an object of the present invention to provide a partition wall and a method of forming the plasma display panel that can further increase the luminance even in the opening structure of a certain size.

1 is a cross-sectional view showing a conventional partition structure.

2A and 2B are cross-sectional views illustrating a partition structure and a light emitting mechanism according to the present invention, respectively;

3A to 3D are cross-sectional views of a plasma display panel partition wall forming process according to an embodiment of the present invention.

* Description of reference numerals for the main parts of the drawings *

21A: Opaque Layer 21B: Transparent Layer

22: phosphor

The present invention for achieving the above object, the electrode formed on the glass substrate; A dielectric layer covering the substrate and the electrode; And a barrier rib formed on the dielectric layer in a double structure of an opaque layer and the transparent layer.

In addition, the present invention for achieving the above object is a first step of forming a dielectric layer on the substrate is completed electrode formation; And sequentially stacking an opaque layer and a transparent layer on the dielectric layer, and forming a partition wall having an upper portion of the transparent layer and a lower portion of the opaque layer. do.

In order to solve the problem that the aperture ratio decreases due to the increase in the number of partition walls and the luminance decreases when manufacturing a high-definition PDP panel, the upper end of the partition wall is formed of a glass-like transparent material that blocks ultraviolet rays and transmits visible light. This has the feature of improving the aperture ratio.

As described above, when the upper end of the barrier rib is formed of a transparent material that blocks ultraviolet rays and transmits only visible light, brightness of the barrier rib may be improved from the conventional opaque material under the same width and cell pitch. Can be.

FIG. 1 is a cross-sectional view showing a conventional barrier rib structure, which illustrates a barrier rib 11 on a substrate 10 on which substrates, such as electrodes and dielectric layers are formed, and phosphors 12 formed in cells, and FIG. 2A is a cross-sectional diagram illustrating a barrier rib structure of the present invention. As shown in FIG. 2, there is shown a partition formed of an opaque layer 21A formed on a substrate 10 on which electrodes, a dielectric layer, etc. are completed, and a transparent layer 21B formed on the opaque layer 21A, and a phosphor 22 formed in a cell. . 1 and 2A, reference numeral 'A' denotes an effective opening, and 'B' denotes visible light.

When visible light is emitted from the phosphors at the same position as shown in FIGS. 1 and 2A, in the partition structure according to the present invention, since visible light passes through the transparent layer 21B provided at the upper side, a larger effective opening A than in the prior art It is possible to improve the luminance by having a light emitting area is enlarged.

That is, as shown in Fig. 2B, the fluorescent material 22 applied on the opaque layer 21A of the partition wall causes the reflective light emission, and the fluorescent material applied on the transparent layer 21B simultaneously reflects and transmits the light emission. Will be done. In FIG. 2A, reference numeral 'R1' denotes ultraviolet light, 'R2' denotes reflected light emission visible light, and 'R3' denotes transmission light emission visible light, respectively.

It is difficult to form all the partitions with all transparent materials. This is because when the barrier rib is formed of only a transparent material, the boundary between the cells is blurry, and when the light is emitted, color mixing occurs between neighboring cells, which makes it difficult to obtain a clear and clean image. Therefore, the transparent layer of the partition wall does not exceed 30% of the total partition height.

The transparent layer is formed of a glass material that blocks or absorbs ultraviolet light and transmits only visible light, thereby preventing cross talk between cells that transmit ultraviolet light generated from one cell to an adjacent cell to excite the phosphor, while at the same time obtaining transmissive light emission.

The partition wall according to the present invention can be formed by a conventional method such as a printing method or a sand blast (sand blast) method.

Hereinafter, a method of forming a partition wall of a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3A to 3D.

First, as shown in FIG. 3A, an opaque layer 21A and a transparent layer 21B to form a partition are formed on the substrate 20 on which address electrodes (not shown) are formed at the height of the partition. The transparent layer 21A is formed of a mixed material such as PbO, SiO ₂ , Al ₂ O ₃ , LiO ₂ , MgO, ZnO series, etc. while blocking or absorbing ultraviolet rays and simultaneously transmitting only visible light because the crystal size is smaller than the wavelength of visible light. The height of the transparent layer 21B does not exceed 30% of the height of the entire partition wall to avoid color mixing between adjacent cells. When the pattern is printed using the entire surface coating or printing process in the process of forming the transparent layer 21B, the particle size of the powder is made about 2 μm to 4 μm to improve the flatness of the barrier rib end portion.

Next, as shown in FIG. 3B, a dry film resist (DFR) 20 for sandblasting is applied.

Next, as shown in FIG. 3C, the DFR 20 is exposed using an exposure mask and then developed to form a DFR 30 mask, followed by sand blasting.

Next, as shown in FIG. 3D, the transparent layer 21B and the opaque layer 21A are selectively removed by sandblasting to form a partition pattern, and the DFR 30 mask is peeled off.

In an embodiment of the present invention described above, a lift off process may be performed to form a partition wall, and the partition wall may be formed in various forms such as a stripe and a matrix.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention made as described above has the effect of improving the brightness of the high-definition panel by forming the upper portion of the partition with a transparent material that transmits only visible light, thereby increasing the effective effective opening without reducing the width of the partition.

Claims (9)

Glass substrates; An electrode formed on the glass substrate; A dielectric layer covering the substrate and the electrode; And A barrier rib formed of a double structure of an opaque layer and the transparent layer on the dielectric layer Plasma display panel comprising a. The method of claim 1, The transparent layer, A plasma display panel comprising a layer for transmitting only visible light. The method of claim 2, The transparent layer, A plasma display panel comprising at least one of PbO, SiO ₂ , Al ₂ O ₃ , LiO ₂ , MgO, and ZnO. The method according to any one of claims 1 to 3, The height of the transparent layer, And at least 30% of the height of the barrier rib. In the method of forming the back plate of the plasma display panel, Forming a dielectric layer on the substrate on which electrode formation is completed; And A second step of sequentially stacking an opaque layer and a transparent layer on the dielectric layer to form a partition wall having an upper portion of the transparent layer and a lower portion of the dielectric layer; Back plate forming method of a plasma display panel comprising a. The method of claim 5, In the second step, A method of forming a back plate of a plasma display panel, comprising forming a transparent layer made of at least one of PbO, SiO ₂ , Al ₂ O ₃ , LiO ₂ , MgO, and ZnO. The method according to claim 5 or 6, The transparent layer, And forming a height not to exceed 30% of the height of the barrier ribs. The method of claim 7, wherein In the second step, A method of forming a back plate of a plasma display panel, wherein the partition wall is formed by sandblasting, printing, or lift-off. The method of claim 7, wherein In the second step, And the transparent layer is formed of a powder having a particle diameter of 2 µm to 4 µm in order to improve flatness of the end portion of the partition wall.