KR19990034463A - Method for Forming Fluorescent Layer of Transmissive Plasma Display Device - Google Patents

Abstract

The present invention discloses a novel method of forming a fluorescent layer of a transmissive PDP.

Since the transmissive PDP has a simple structure and high luminance, it is not practical to form a thin and uniform fluorescent layer. In the present invention, a separation layer is formed first at the boundary thereof, and a fluorescent layer is formed therebetween. The fluorescent layer was planarized based on the surface to prepare a thin and uniform fluorescent layer that can realize a transmissive PDP.

Description

Method for Forming Fluorescent Layer of Transmissive Plasma Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of plasma display panels (PDPs), and more particularly to a method of forming a fluorescent layer of a transmissive PDP.

PDPs using gas discharge phenomena for image display can realize a color image by providing a fluorescent layer. PDPs are classified into transmission type and reflection type according to the arrangement of the fluorescent layer and the transmission method of discharge light.

First, a transmissive PDP is shown in FIG. 1, in which two electrodes P1 and P2 filled with a discharge gas intersect electrodes E1 and E2, and the pixels are partitioned by partition walls B. The illustrated PDP is of the alternating current type and symbols D and T represent a dielectric layer and a protective layer thereof.

In this configuration, the fluorescent layer F is formed on the front substrate P1, so that the discharge light generated in the discharge space between the partition walls B passes through the fluorescent layer F as it is, so that high luminance and high reproducibility can be achieved. It becomes possible.

However, such a transmissive PDP has a thin and uniform color filter in the form of a fluorescent layer, so that it is possible to realize a uniform brightness over the entire surface, and thus it is very difficult to manufacture. Therefore, a practical PDP is generally composed of a reflective type as shown in FIG. It is becoming.

In FIG. 2, the fluorescent layer F is formed on the back substrate P2 side, and the discharge is projected to the back substrate P2 side, and then excites the fluorescent layer F to reflect the light toward the front substrate P1 side. Since it is projected, its basic luminous luminance is lower than that of the transmission type of FIG.

In addition, since the dielectric layer D must be stacked on the electrode not covered with the fluorescent layer F, that is, the electrode E1 on the front substrate P1 side, the dielectric layer D not only covers the transmission path of the discharge light, but also during the manufacturing process. A protective layer (T) made of ITO or the like which is susceptible to clouding also inhibits light transmission.

Accordingly, in order to properly implement the light emission luminance with the reflective PDP, not only a reflective layer having a high reflectance is required but also the surface area of the fluorescent layer F must be increased, thereby forming a fluorescent layer F having a U-shaped cross section as shown. Although the means of is used, it is not easy for the process to form the fluorescent layer F of the U-shaped cross section by the printing method.

Therefore, if it is possible to form a thin and uniform fluorescent layer (F), the use of a transmissive PDP can provide a simple structure and high luminous efficiency PDP, which is the purpose of the present invention.

1 is a cross-sectional view showing the configuration of a transmissive PDP;

2 is a cross-sectional view showing the configuration of a reflective PDP;

3 (A)-(D) are sequential cross-sectional views illustrating the method of the present invention.

4 (C1) to (C3) are detailed process cross-sectional views of FIG. 3 (C) showing a preferred method of the present invention.

<Description of Symbols for Main Parts of Drawings>

P1, P2: Front and Back Boards

F: fluorescent layer (as generic term)

R, G, B: fluorescent layer (for each color)

1: dividing layer

2: front layer (to form a separation layer)

In order to achieve the above object, the method of the present invention forms a separation layer at the boundary of each of the fluorescent layers of R, G, and B on the front substrate, and then prints the fluorescent layers of the separation layers R, G, and B sequentially. It features.

According to one feature of the present invention, the fluorescent layer is flattened to be the same thickness as that of the separation layer, and this method of planarization is made by pressurization by a blade.

Accordingly, each fluorescent layer is flattened to the same thickness as the separation layer, so that uniform luminance can be reproduced.

As a result, a transmissive PDP having a simple structure and excellent luminance and color reproducibility can be manufactured in a low cost and simple process.

EXAMPLE

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. 3A, the front layer 2 on which the separator layer 1 is to be formed is formed on the front substrate P1 with a uniform thickness.

The front layer 2 is then patterned by photolithography to form a partition layer 1 as shown in Fig. 3B. For this purpose, the front layer 2 includes a photosensitive material or a front layer. The photosensitive layer is laminated on (2) to be selectively exposed and developed and, if necessary, calcined. This is obvious to those skilled in the art, and unnecessary details will be omitted.

In this case, the front layer 2 should be formed as uniformly as possible as described above. In case of using the thick film method, roll coating or doctor bade is used rather than screen printing. Using a law, etc. will be able to form a more uniform thickness throughout.

In the case of using a thin film method such as sputtering, a thinner and more uniform separation layer 1 and a thinner and more uniform fluorescent layer F can be obtained. Is not so desirable because it is very high.

After the separation layer 1 is completed, the required fluorescent layers R, G, and B are sequentially printed between the separation layers 1 as shown in FIG. 3 (C), and the fluorescent layer R as shown in FIG. 3 (D). , G, B).

At this time, the separation layer 1 is left at the boundary of each fluorescent layer (R, G, B), which is composed of two or more ways in which there is no opposite as shown below can perform different functions.

First, when the separation layer 1 is composed of a transparent layer such as SiO ₂ , the separation layer 1 diffuses the light generated in each of the fluorescent layers F; R, G, and B, thereby expanding the viewing angle of the PDP. Will be

On the other hand, the separation layer 1 may be composed of a black layer due to the inclusion of low luminance, in particular, black pigment, etc. Then, the separation layer 1 acts as a black stripe, resulting in contrast of the display image. It can contribute to improvement.

The above two configuration methods potentially presuppose that the insulating layer 1 is an insulating layer, and the separating layer 1 may be formed of a conductive layer. In this case, the separating layer 1 may be formed by ITO or the like. It may be composed of a transparent conductive layer, an opaque conductive layer made of Ag or Al, or a black conductive layer made of a metallic material, especially a black Ag black pigment.

Then, the division layer 1 may function as an auxiliary electrode or a bus electrode that assists the action of the front electrode E1.

However, since the sequential printing of each of the fluorescent layers of R, G, and B in FIG.

Screen printing is to form a printing screen by applying a non-permeable binder on the screen to form a transparent window thereon, and the printing surface is not very uniform because the pressure is printed by the paste.

Accordingly, FIG. 4 illustrates an evening process that supplements the sequential printing process of FIG. 3C. The fluorescent layer (eg, R) formed between the separation layers 1 by screen printing is illustrated in FIG. 4. The surface is not uniform as in (C1).

Accordingly, when the pressure L of the blade L, such as a metal sheet, is pressed at the surface level of the partition layer 1 as shown in FIG. 4 (C2), the surface of the fluorescent layer R is separated from the surface as shown in FIG. It is formed uniformly at the same level as the surface of (1). This process is repeated for each fluorescent layer (R, G, B) to complete the fluorescent layer (F).

That is, the present invention forms the separator layer 1 first and prints the fluorescent layer F; R, G, and B in the form of filling therebetween, thereby easily printing the fluorescent layer F; R, G, and B. More preferably, the surface of the fluorescent layer (F) is planarized based on the surface of the separation layer (1) to enable the formation of a thin and uniform fluorescent layer (F). ).

In particular, the separation layer 1 may not only contribute to the formation of the fluorescent layer F but may be used as an improvement in viewing angle or contrast, or as an auxiliary electrode. Therefore, the present invention has a great effect in the practical use of high brightness high quality transmissive PDP.

Claims (12)

In the method for forming each of the R, G, B fluorescent layer on the front substrate of the transmissive plasma display device, After forming a separation layer on the boundary of each fluorescent layer of the front substrate, And forming R, G, and B fluorescent layers sequentially between the division layers. The method of claim 1, The separation layer is formed by photolithography after forming the entire surface of the front layer A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 2, The front layer is formed by a printing method A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 2, The front layer is formed by a thin film method A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 1, The separator layer is formed of an insulating layer A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 1, The partition layer is formed of a conductive layer A method of forming a fluorescent layer of a transmissive plasma display device. The method according to any one of claims 1, 5 or 6, The separation layer is formed of a transparent layer A method of forming a fluorescent layer of a transmissive plasma display device. The method according to any one of claims 1, 5 or 6, The partition layer is formed of an opaque layer A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 8, The partition layer is formed of a black layer A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 1, The upper surface of the fluorescent layer is formed at the same level as the separation layer A method of forming a fluorescent layer of a transmissive plasma display device. The method according to any one of claims 1 to 10, After the printing of the fluorescent layer is a process of flattening to the same level as the surface of the separation layer is performed A method of forming a fluorescent layer of a transmissive plasma display device. The method of claim 11, The planarization of the fluorescent layer is made by the pressure running of the blade A method of forming a fluorescent layer of a transmissive plasma display device.