KR0179122B1 - Method for forming screen of color crt - Google Patents

Abstract

The present invention relates to preventing the color purity from being lowered by forming different particle sizes of the three-color phosphor in forming the fluorescent film screen of the color receiver, and using the three-color phosphor in the color receiver. A screen forming method for forming a fluorescent film, wherein the phosphor particle size applied to a panel is applied so that the first applied phosphor is the smallest and the last applied phosphor is the largest. Technology.

Description

How to form the screen of the collar receiving tube

1 is a schematic diagram of a conventional color water pipe structure.

2 is a cross-sectional view of a conventional screen forming.

3 is a manufacturing process diagram for forming a conventional screen.

4 is a manufacturing process diagram for forming a screen of the present invention.

* Explanation of symbols for main parts of the drawings

1 panel 3 fluorescent film

10G: green phosphor 10B: blue phosphor

10R: red phosphor 11: graphite band

The present invention relates to a method for forming a screen of a color receiver, and in particular, in forming a three-color phosphor emitting light from a screen, a phosphor film suitable for preventing color purity degradation and improving luminance by varying particle sizes of the three-color phosphor. It is about formation.

In general, as shown in FIG. 1, the color water pipe is fused with a panel 9 and a funnel 2 coated with graphite 9, and the inner surface of the panel 1 has three colors (red, green, blue). The fluorescent film 3 to emit light is deposited and the neck 4 is provided with an electron gun 6 which emits an electron beam 5 corresponding to three fluorescent film pixels.

The shadow mask 7 in which a plurality of slots or dot-shaped openings are arranged is supported by a frame at the positions of the fluorescent film 3 that face each other.

In such a structure, the electron beam 5 is deflected by the deflecting device 8 and lands on the screen to reproduce the screen while passing through the fine opening of the shadow mask 7 for color screening.

In the above structure, as shown in FIG. 2, the fluorescent film 3 has three colors of red (R) coated on the inner surface of the panel 1 with a graphite band 11 for giving contrast and purity margin and a phosphor emitting by an electron beam, It consists of green (G) and blue (B) phosphor strips.

The fluorescent film 3 is formed through the process as shown in FIG.

As shown in (a), graphite is injected into the inner surface of the panel (1), dried, exposed, and developed with water to form a graphite strip 11 having a thickness of about 5 to 10 μm, followed by rust (G), blue (B), and red ( R) The phosphors are formed in sequence, first consisting of a rust (G) phosphor with polyvinyl alcohol-dichromic acid, sodium-based photoreceptor and other additives to form a slurry, which is applied to the front of the panel and then the rust (G) phosphor zone Opening and masking the other parts will expose the green phosphor zone to harden and develop it to form a green phosphor (G) as in (a).

Subsequently, a slurry in which the blue (B) phosphor was mixed with the above-mentioned drugs was made and applied to the entire surface as shown in (b), and then the blue (B) phosphor compartment was opened and the other parts were masked and exposed to expose the blue (B) phosphor compartment. The part is cured, and when developed, it becomes as in (c).

Subsequently, when the red (R) phosphor slurry is applied to the entire surface as in (d) in the same manner as described above, exposure development is carried out as in (e) to form a three-color phosphor.

However, the above-described phosphor film has a problem in that phosphors applied after the phosphors of the same size are formed in the order of green, blue and red are mixed into the preceding phosphor.

That is, blue (B) phosphors are mixed into the green (G) phosphors applied as shown in FIGS. 3B and 3C, or blue (B) phosphors and red (R) as shown in (d) and (e). ) Is incorporated into the phosphor.

When the phosphor of different colors is mixed, the color purity is lowered and the screen quality is deteriorated. In particular, when the red phosphor is mixed in the blue spray, it is conspicuous.

The present invention has been made to solve the above problems, by changing the particle size of the green, blue, and red phosphors to prevent the phosphors of different colors between the phosphors to prevent color purity degradation and to obtain a fluorescent film with improved brightness The purpose is to sleep.

The present invention for achieving the above object is a screen forming method for applying a fluorescent film using a three-color phosphor in the color receiving tube, the phosphor to be applied to the panel particle size is applied to the first, the phosphor is the smallest, the last applied phosphor It is made of a manufacturing method characterized in that the coating to the largest.

4 shows the process of forming a fluorescent film of the present invention with different particle sizes of three-color phosphors. The method for forming a fluorescent film and the process itself are the same as those of the conventional process of FIG. It is characteristic for application.

That is, the graphite band 11 is formed on the inner surface of the panel 1, and rust (G), blue (B), and red (R) phosphors are sequentially formed. First, rust (10G) having the smallest particle size is formed. A slurry composed of phosphors was applied to the entire surface, followed by exposure development as shown in (a), and a slurry composed of blue (10B) phosphors or the like larger than rust (10G) phosphor particles was applied, exposed and developed as shown in (b) ( Obtain a blue (10B) phosphor as in c), and apply a slurry made of the phosphor (10R) with the largest phosphor particles applied at the end as in (d), and expose and develop it as in (e). By forming the (10R) phosphor, a tricolor phosphor is obtained.

As described above, according to the present invention, the phosphor particles are applied in the order of greenish green or greenish blue, so that phosphors formed later on the previously formed phosphor stripes do not remain, thereby preventing color purity and screen quality deterioration. As the particle size to be applied increases, the luminous efficiency increases.

Therefore, since the green phosphor applying current to the total current applied to the electron gun cathode is high when driving the color receiving tube, it is possible to obtain an excellent fluorescent film used for the color receiving tube capable of improving luminance.

Claims (2)

A screen forming method of forming a fluorescent film using three-color phosphors in a color receiving tube, wherein the phosphor particle size applied to the panel is applied in such a manner that the phosphor applied first is the smallest and the phosphor applied later is the largest. Screen formation method of color water pipe to be made. 2. The method of claim 1, wherein the phosphor particle size is in the order of cyan or cyan.