KR0151291B1 - Phosphor forming method of color braun tube - Google Patents

Abstract

The present invention relates to a method for forming a fluorescent surface of a color CRT, in particular, by using a pigment residue prevention layer under the R, G, B pigment filter layer to prevent the R, G, B pigment particles from remaining in the other color position, and thus the contrast and luminance of the CRT. The present invention relates to a method for forming a fluorescent surface of a color CRT that is suitable for improving the efficiency of the CRT.

In order to achieve the above object of the present invention, a fluorescent surface forming method of a color brown tube includes a first step of forming a black matrix on the panel in a color cathode ray tube including a fluorescent surface on an inner surface of the panel, and a first free surface on the front surface of the panel. A second step of coating the coating film and the first color pigment film in sequence and patterning the first precoat film and the first color pigment film so as to remain only in the first color pixel region; and a second precoat film and a second color pigment film on the entire surface. A third step of patterning the second precoat film and the second color pigment film so as to be applied in sequence and remaining only in the second color pixel area, and then applying a third precoat film and a third color pigment film on the entire surface, and then applying a third color pixel area. A fourth process of patterning a third precoat film and a third color pigment film so as to remain only, a fifth process of forming a first phosphor film in the first color pixel region, and a second phosphor film in the second color pixel region 6th process Characterized the yirueojim including a seventh step of forming the first film a third color phosphor in the third pixel region.

Description

How to Form Fluorescent Surface of Color Brown Tube

1 is a fluorescent surface structure diagram of a conventional color CRT.

2 is a drawing substitute photograph showing a conventional fluorescent surface with pigments.

Figure 3 is a cross-sectional view of the fluorescent surface process of the color CRT of the present invention.

Figure 4 is a comparison of the fluorescent surface luminance characteristics of the color CRT according to the prior art and the present invention.

5 is a comparison of fluorescent surface luminance contrast characteristics of color CRT tubes according to the prior art and the present invention.

* Explanation of symbols for main parts of the drawings

31: panel surface 32: black matrix

33R, 33G, 33B: 1st, 2nd, 3rd precoat film

34R, 34G, 34B: 1st, 2nd, 3rd pigment thin film

35: shadow mask 36R, 36G, 36B: first, second, third phosphor film

The present invention relates to a method for forming a fluorescent surface of a color CRT, in particular, by using a pigment residue prevention layer under the R, G, B pigment filter layer so that the R, G, B pigment particles do not remain in the other color position, and thus the contrast and luminance of the CRT. It relates to a method for forming a fluorescent surface of a color CRT tube to be suitable for improving the efficiency.

FIG. 1 is a diagram showing a fluorescent surface structure of a conventional color CRT, in which corresponding R, G, and B three-color phosphor films are formed in each color pixel region of the panel 1 on which the black matrix 2 is formed.

At this time, in the R, G, B tri-color phosphor, a predetermined phosphor is applied to the panel a slurry composed of polyvinyl alcohol-dichromic acid, sodium photosensitizer and other additives and exposed using a shadow mask (5). A desired desired phosphor film is obtained. The above process is repeated to form phosphor films of three colors R, G and B. In the above three-color phosphors, R and B phosphors use a phosphor film with a pigment as shown in FIG. 2 to improve contrast.

In the fluorescent surface of the conventional color CRT manufactured as described above, by forming a pigmented phosphor having pigment particles 4R and 4B attached to surfaces of phosphors 6R and 6B in each color pixel area of the panel, external incident light passing through the panel It is absorbed by the pigment attached to the surface of the phosphor particles, so that the contrast is improved. However, in the conventional fluorescent film forming method of the color CRT, there are the following problems.

First, since a fluorescent substance with a pigment is applied to a corresponding pixel region to form a fluorescent surface, the luminance inherent in the phosphor is reduced to lower luminance. That is, since the phosphor particles with pigments are usually overlapped with each other on the surface of the phosphor formed in the pixel region, about 3 to 4 particles are formed, the emission intensity inherent in the phosphor is reduced, and the luminance of the color cathode ray tube is also reduced.

Second, when the pigment is attached to the surface of the phosphor particles, it is difficult to uniformly attach the pigment, and since the pigment slightly absorbs external incident light by aggregation between the pigments, it is difficult to realize the intended contrast enhancement. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to improve the contrast and brightness of color CRTs by forming a precoat film so that R, G and B pigment particles do not remain in other color positions.

The color CRT fluorescent surface forming method of the present invention for achieving the above object comprises a first step of forming a black matrix on the panel in a color cathode ray tube including a fluorescent surface on an inner surface of the panel, and a first free surface on the front surface of the panel; A second step of coating the coating film and the first color pigment film sequentially and patterning the first precoat film and the first color pigment film so as to remain only in the first color pixel region; and a second precoat film and a second color pigment film on the entire surface. A third step of patterning the second precoat film and the second color pigment film so as to be applied in sequence and remaining only in the second color pixel area, and then applying a third precoat film and a third color pigment film on the entire surface, and then applying a third color pixel area. A fourth process of patterning a third precoat film and a third color pigment film so as to remain only, a fifth process of forming a first phosphor film in the first color pixel region, and a second phosphor film in the second color pixel region The sixth to say And a seventh step of forming a third phosphor film in the third color pixel region.

Color fluorescent tube fluorescent surface forming method of the present invention as described above will be described in more detail with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view of a color CRT fluorescent surface of the present invention, in which a black matrix 32 is formed on a panel as shown in FIG. 3 (a), followed by a first precoat on the front surface as shown in FIG. The liquid 33R is applied. At this time, the first precoat liquid 33R is mainly composed of a polymer of polystyrene latex, naphthalene sulfornic acid and formalin, and serves to prevent the particles of pigments, which are fine particles, from adhering to a position other than a desired predetermined position. To use. Subsequently, as shown in FIG. 3 (c), a first color pigment layer 34R is formed on the first precoat layer 33R, and a shadow mask 35 is sandwiched and exposed on the first pigment layer 34R. And develop. At this time, during the development, the exposed portion is left by the photocuring reaction, leaving only the first precoat layer under the exposed pigment layer and the exposed pigment layer, and all of the unexposed portions are removed to remove the portion of FIG. As in d), the first precoat film 33R and the first color pigment thin film 34R are patterned so as to remain only in the first pixel color region. Here, the pigment suspension is composed of a suspension dispersed in a polyvinyl alcohol-sodium dichromate photosensitive liquid.

Subsequently, as shown in FIG. 3E, the second precoat liquid 33G is applied to the entire surface, and the second color pigment layer 34G is formed on the second precoat film 33G. A shadow mask 35 is sandwiched on the second pigment layer 34G to expose and develop. The exposed second color pigment layer and the second precoat film under the exposed pigment layer are patterned as in FIG. 3 (f) so that only the second pixel color region remains.

Subsequently, a third precoat liquid 33B is applied to the entire surface as shown in FIG. 3 (g), and a third color pigment layer 34B is formed on the third precoat film 33B. The third color pigment layer exposed by inserting and shadowing the shadow mask 35 on the third pigment layer 34G and the third precoat layer under the exposed pigment layer are patterned so as to remain only in the third pixel color region. .

Then, as shown in FIG. 3 (i), a first color phosphor is coated on the entire surface, and a shadow mask is placed on the first color phosphor to expose and develop the first color phosphor film 36R. The first pixel color region is formed by forming over 34R.

Subsequently, a second color phosphor is coated on the entire surface, and a shadow mask is placed on the second color phosphor to expose and develop a second color phosphor film 36G on the second color pigment thin film 34G. A collar region is formed.

A third color phosphor is coated on the entire surface, and a third mask is formed on the third color pigment film 34B by exposing and developing a shadow mask on the third color phosphor to form the third color phosphor film 36B on the third color pigment film 34B. Is formed.

The fluorescent surface forming method of the color CRT tube of the present invention formed as described above has the following effects.

4 is a comparison of luminance characteristics of the fluorescent surface according to the conventional art and the present invention, and FIG. 5 is a comparison of the contrast characteristic according to the conventional art and the present invention. The luminance and contrast are improved as in Figs.

Claims (1)

In a color cathode ray tube including a fluorescent surface on an inner surface of a panel, a first process of forming a black matrix on the panel, and a first precoat film and a first color pigment film are sequentially applied on the front surface of the panel, and then the first color pixel region. And a second step of patterning the first precoat film and the first color pigment film so as to remain only, the second precoat film and the second color pigment film are sequentially applied to the entire surface, and the second precoat film is left only in the second color pixel region. A third step of patterning the second color pigment film, and a third precoat film and a third color pigment film are sequentially applied to the entire surface, and the third precoat film and the third color pigment film are patterned so as to remain only in the third color pixel region. A fourth step of forming a first phosphor film in the first color pixel region, a sixth step of forming a second phosphor film in the second color pixel region, and a third phosphor in the third color pixel region Including the seventh step of forming a film Method for forming a fluorescent surface of a color CRT, characterized in that made.