KR19980040892A - How to Form Fluorescent Surface of Color Brown Tube - Google Patents

Abstract

The present invention discloses a novel method of forming the fluorescent surface of a color brown tube.

Conventionally, by constructing a color fluorescent surface by repetition of photolithography, many facilities and process costs are required, and the quality of the fluorescent surface is also low.

In the present invention, by forming an electrode on the inner surface of the panel and selectively connecting the electrode and electrodepositing each phosphor to form a fluorescent surface, it provides a high-quality fluorescent surface with a low manufacturing cost.

Description

How to Form Fluorescent Surface of Color Brown Tube

1 is a partially enlarged cross-sectional view showing the configuration of a panel of a color brown tube,

2 (a) to (e) are sequential cross-sectional views showing a conventional method,

3 (a) to (bar) are sequential cross-sectional views showing the method of the present invention,

4 is an enlarged cross-sectional view of the main portion showing the fluorescent surface formed by the present invention.

* Description of the symbols for the main parts of the drawings *

P: panel T: black stripe

F: R, G, B: Phosphor 1: Electrode

2: conductive layer 3: power supply

Q: electrodeposition liquid (of phosphor)

The present invention relates to the production of color-brown tubes, and more particularly to a method for forming the fluorescent surface.

The black-and-white CRT having a single fluorescent layer may form a fluorescent layer by precipitation by injecting an aqueous phosphor solution into a bulb. However, in the color-brown tube, as shown in FIG. 1, the R, G, and B phosphors are arranged in a predetermined pattern between the black stripe T to form a phosphor layer. After forming a fluorescent layer in a separated state, various pore parts are mounted to seal the funnel.

On the back of the fluorescent layer, a metal back (M) is formed by deposition of Al or the like to increase the luminance of light and prevent burnout of the fluorescent layer.

Here, a general method of forming the fluorescent surface will be described with reference to FIG. 1.

First, as shown in (a), a black stripe T is formed on the panel P.

Next, as shown in (b), a coating film of phosphor F is formed on the black stripe T using a spin coating method, and the like is exposed through a mask M as shown in (c). By developing, one phosphor F between the black stripes T is patterned as shown in (D).

By repeating the process from (B) to (D) for each of the R, G, and B phosphors, the phosphor surface in which R, G, and B phosphors (F) are alternately formed between the black stripes (T) as shown in (E). This is done.

Thus, the conventional method is repeated four times the photo-etching method including the formation of the black stripe (T), so the process is very complicated and the process cost and facility cost is high.

In particular, in FIG. 1 (C), the exposure is performed by shifting the light source using a shadow mask as a mask to expose each phosphor F; R, G, and B. It is difficult to obtain the quality of the finished fluorescent screen is not high.

In view of such a conventional problem, an object of the present invention is to provide a method for forming a fluorescent surface quickly and with high quality without using expensive photolithography.

The fluorescent surface forming method according to the present invention for achieving the above object;

By forming electrodes between the black stripes,

The electrodes are selectively connected to electrodeposit R, G, and B phosphors.

According to such a configuration, it is possible to reduce the conventional four photolithography processes two times or one time to form the fluorescent surface, thereby remarkably reducing the cost, and the quality of the finished fluorescent surface is also very high.

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, a black stripe T is first formed on an inner surface of the panel P. In FIG.

Then, as shown in (b), the conductive layer 2 is entirely formed on the black stripe T with a predetermined conductive material including a photosensitive material.

Next, the conductive layer 2 is exposed and developed through the mask M as shown in (c) to form the electrode 1 between the black stripes T as shown in (d). At this time, the exposure of the conductive layer 2 becomes the entire surface exposure, rather than the conventional selective exposure.

After the electrode 1 is completed, the electrode 1 on which one of the phosphors F is to be formed is selectively connected as shown in (d), and the electrodeposited liquid Q in which the phosphors F are dispersed is dispersed. The phosphor P is attached to the electrode 1 by applying the power source 3 to the electrode 1 by dipping the panel P into the inside.

As such, the corresponding electrodes 1 of the R, G, and B phosphors F are selectively connected to each other, and the R, G, and B electrodeposition liquids Q are sequentially passed. As described above, a fluorescent surface on which the phosphors F; R, G, and B are alternately formed is completed on the electrode 1.

The electrode 1 may be formed of a transparent electrode such as indium tin oxide (ITO).

Then, the coating area of the phosphor F is increased by the thickness of the electrode 1, and the electrode 1, which is a transparent electrode, serves as a diffusion layer of light generated from the phosphor F, as shown in FIG. As a result, the viewing angle of the completed color-brown tube is greatly increased.

Meanwhile, the electrode 1 may be configured as a black electrode including a conductive material having a black body color such as graphite or a black pigment. Then, the electrode 1 may serve to improve contrast by forming a black layer on the entire surface of the phosphor F. FIG.

In this case, the electrode 1 is configured to replace the black stripe T, i.e., without forming the black stripe T, a fluorescent surface is formed by the electrode 1 and the respective phosphors F; R, G, and B, or the black stripe is formed. (T) itself may be used as the electrode 1 to form a fluorescent screen, but then each phosphor (F; R, G, B) is divided into two by the electrode (1) as viewed from the front and between the adjacent phosphor (F) Since there is a possibility that interference such as mixed color may occur, it is preferable to use the black stripe T and the electrode 1 made of the black electrode together.

In the latter case, a slight decrease in luminance is inevitable, but in the recent high-definition CRTs such as black tint CRTs, contrast is more important, so there is no practical problem.

In this embodiment, one photolithography method for forming the black stripe T and one photolithography method for patterning the conductive layer 2 are used, respectively.

However, instead of exposing the conductive layer 2 by the mask M in FIG. 3 (c), the light source is exposed from the front surface (bottom surface of the panel) of the panel P using the point that the black stripe T is impermeable. When the conductive layer 2 is exposed by irradiating light, the electrode 1 may be formed by only a photolithography process of the black stripe T, thereby simplifying the process.

In addition, the electrode 1 is commonly connected to a metal back (not shown) that charges the fluorescent surface at high potential, so that the electrode 1 can effectively function in acceleration of the electron beam.

As described above, according to the present invention, it is possible to configure a high-quality color fluorescent surface in a very simple process, thereby greatly reducing the cost and improving the quality of the color-brown tube manufacturing.

Claims (9)

In the method for forming a fluorescent surface made of R, G, B phosphors on the inner surface of the panel of the color brown tube, After forming a plurality of electrodes on the inner surface of the panel, Selectively connecting the electrodes to sequentially deposit the R, G and B phosphors; A fluorescent surface forming method of a color brown tube. The method of claim 1, Black stripe is formed on the inner surface of the panel A fluorescent surface forming method of a color brown tube. The method according to any one of claims 1 to 2, The electrode is formed between the black stripe A fluorescent surface forming method of a color brown tube. The method according to any one of claims 1 to 2, The black stripe functions as the electrode A fluorescent surface forming method of a color brown tube. The method of claim 1, The electrode is formed of a transparent electrode A fluorescent surface forming method of a color brown tube. The method of claim 1, The electrode is formed of a black electrode A fluorescent surface forming method of a color brown tube. The method of claim 1, The electrode is formed by a photolithography method A fluorescent surface forming method of a color brown tube. The method of claim 7, wherein The electrode is formed by exposing a photosensitive conductive layer through a mask. A fluorescent surface forming method of a color brown tube. The method according to any one of claims 1 to 2 or 7, The electrode forms a photosensitive conductive layer on the black stripe, Formed by exposing through the black stripe from the front surface of the panel A fluorescent surface forming method of a color brown tube.