KR19980040869A - AC plasma display device - Google Patents

Abstract

The present invention discloses an AC PDP of an improved configuration.

Conventional AC PDP has a MgO protective layer on the dielectric layer, it is easy to be contaminated, there is a problem of low reflection efficiency while requiring a high clean environment.

In the present invention, by forming a reflective layer of a light reflection material that replaces or supplements the protective layer on the dielectric layer, the reflection efficiency is increased, and in particular, the use of Si lowers the required cleanliness of the manufacturing environment.

Description

AC plasma display device

1 is a cross-sectional view showing the composition of a general AC PDP,

2 is a cross-sectional view showing the configuration of an AC PDP according to the present invention;

3 is a cross-sectional view showing another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

P1, P2: Substrate

E1, E2: electrode

F: fluorescent layer

I: dielectric layer

T: overcoat layer

R: reflective layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly to an AC PDP.

When more than one potential difference is applied between two spatially separated contacts in a non-vacuum gas atmosphere, a discharge occurs. This is called a gas discharge phenomenon.

PDP is a flat panel display device which applies such gas discharge phenomenon to image display, and basically has a matrix structure in which electrodes are opposed to two substrates filled with discharge gas therebetween.

The PDP DC type DC has a problem in that the start of the discharge is delayed and the discharge started is not maintained when it is not selected, and thus the light emitting luminance sufficient for high resolution or moving picture display cannot be obtained.

Accordingly, various configurations of the PDP have been proposed for realizing the speed and memory effects. The AC PDP shown in FIG. 1 is most widely used.

The AC PDP has a basic structure in which electrodes E1 and E2 are cross-aligned to two substrates P1 and P2 filled with discharge gas and partitioned into partitions B. Wall charges are applied to one electrode E2. The dielectric layer I to be formed is coated and the fluorescent layer F is formed on the electrode E1 on the opposite side.

In such an AC PDP, the functional layers such as the electrodes E1 and E2, the partition walls B, and the dielectric layers I and the like are preferably manufactured by a printing method which is a production cost thick film process. The process is considerably poor in film formation compared with the thin film process.

Therefore, the sputtering of electrons and ions generated by the discharge damages the dielectric layer I and the lower electrode E2, thereby shortening the life of the AC PDP.

As a result, MgO is formed on the dielectric layer I to a thickness of about several hundred nm by a thin film process such as deposition to form a protective layer T.

The protective layer (T) made of MgO lowers the discharge residual pressure and is stable against sputtering to protect the dielectric layer (I), thereby ensuring the long life of the AC PDP.

However, since MgO is an oxide itself, there is a problem that it is easy to be contaminated by other materials in the manufacturing process and requires a considerable high clean environment. Nevertheless, the MgO protective layer (T), which is actually manufactured, is grayed out in gray and absorbs light generated from the fluorescent layer F without sufficiently reflecting to the front substrate P1 side, thereby significantly reducing the luminance of AC PDP. there is a problem.

In order to solve this problem, the partition B may be formed of a white material, but in this case, there is a problem of causing a decrease in contrast.

In view of such a conventional problem, an object of the present invention is to provide an AC PDP which is easy to manufacture and implements high luminous luminance.

In order to achieve the above object, the AC PDP according to the present invention is characterized by forming a reflective layer made of a non-conductive light reflecting material on a dielectric layer formed on an electrode of a rear substrate.

The reflective layer is preferably formed of a non-conductive glossy metal such as a white material or Si. Since Si has a low bond to oxygen, carbon, etc., it is not contaminated and thus maintains metallic gloss. The reflection layer can be configured.

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In FIG. 2, the front substrate P1 and the rear substrate P2 are arranged to face each other with electrodes E1 and E2 interposed therebetween, and a discharge gas is charged therebetween to partition the partition B. As shown in FIG.

Here, the dielectric layer I is formed on the back substrate P2 side and the fluorescent layer F is formed on the front substrate P1 side, respectively, in the fluorescent layer F excited by the discharge between the two electrodes E1 and E2. The generated visible light is transmitted to the user by the direct transmission of the front substrate P1 and the reflection of the rear substrate P2.

According to the characteristics of the present invention, the reflective layer R is formed on the dielectric layer I by a non-conductive reflective material.

The reflective layer R is preferably composed of a white material or a non-conductive shiny metal, and more preferably, the material is Si. Si itself has a metallic luster and can maintain sufficient uniformity even if it is formed by a thin film method as well as a thin film method.

A protective layer T made of MgO or the like may be formed on the reflective layer R as in the prior art.

The reflective layer R of the embodiment of FIG. 2 may be formed by a thick film method. Preferably, a Si powder and a white pigment are mixed with a solvent to form a paste, and the paste is printed on the dielectric layer I. After firing, the reflective layer R of white material can be obtained.

When the reflective layer R is formed by the thick film method, it is preferable that a protective layer T as in the prior art is formed thereon.

In such a configuration, the reflective layer R made of a white material or a shiny metal reflects light emitted from the fluorescent layer F toward the front substrate P1, thereby achieving high luminance.

Accordingly, the reflective layer R may be formed to replace the protective layer T as shown in FIG. 3. At this time, the reflective layer (R) may be preferably formed by forming Si by a thin film method such as vapor deposition.

That is, the embodiment of FIG. 2 improves the light emission luminance of the PDP by forming a reflective layer R of a white material, which is preferably formed in a thick film process, and the embodiment of FIG. 3 is preferably non-conductive gloss. The reflective layer R made of the metallic metal is directly exposed to the discharge space, thereby exhibiting more excellent reflecting ability.

In particular, in the embodiment of FIG. 3, when the reflective layer R is made of Si, since Si has a stable physical property with much lower bondability with oxygen or carbon than MgO, contamination by foreign matters is less and maintains a high clean environment. Even without contamination, it is possible to maintain high gloss and thus high reflection efficiency.

In addition, since the reflective layer R improves the luminance, the partition wall B can be formed black without the need for the white material, thereby improving the luminance of light emitted without sacrificing contrast.

Here, the degree of cleanliness required in the manufacturing process greatly affects the manufacturing cost of the PDP. For example, the manufacture of the protective layer (T) by MgO requires not only a dustproof coating such as dustproof dustproofing but also a completely sealed control atmosphere. , The reflective layer (R) by Si can provide the environment necessary for manufacturing only by dustproof coating, thereby reducing the equipment and operating costs.

As described above, according to the present invention, there is a great effect of providing high brightness and high quality AC PDP at low manufacturing cost.

Claims (6)

In an AC plasma display device in which electrodes are arranged to face each other on the front and rear substrates, and a dielectric layer is formed on the electrodes of the rear substrate, and a fluorescent layer is formed on the electrodes of the front substrate, respectively. And an reflective layer made of a non-conductive light reflecting material is formed on the dielectric layer. The method of claim 1, And a protective layer made of MgO is formed on the reflective layer. The method of claim 1, And the reflective layer is formed of a non-conductive shiny metal. The method of claim 3, wherein And the reflective layer is formed of Si. The method according to any one of claims 1 to 2, AC plasma display device, characterized in that the reflective layer is formed of a white material. The method of claim 5, And the reflective layer is formed by printing and baking a paste of Si and a white pigment.