KR19990032635A - Method for preparing fluorescent membrane of color cathode ray tube and composition of 3-color mixed filter suspension - Google Patents

Abstract

The present invention relates to a method for producing a fluorescent film of a color cathode ray tube and a composition of a three-color mixed filter suspension, in particular, to simplify the manufacturing process, to improve the phenomenon of fluorescent film dropout and fluorescent film cutting, and to leave phosphor particles in other colors (residues). ) And to improve the quality and luminance of the fluorescent film.

In order to achieve the above object, the present invention provides a method for manufacturing a fluorescent film of a color cathode ray tube in which a black matrix layer is formed on an inner surface of a panel, and then a three-color mixed filter layer is formed, and each phosphor layer is formed thereon. The suspension for forming the mixture is a precoat solution composed of polystyrene latex, colloidal silica, polyvinyl alcohol and a filter liquid mixed with a green pigment, a red pigment and a blue pigment.

Description

Method for preparing fluorescent membrane of color cathode ray tube and composition of 3-color mixed filter suspension

The present invention relates to a color cathode ray tube, and more particularly to a composition of a three-color mixed filter layer applied on top of a black matrix before forming the three-color phosphor layer.

As shown in FIG. 1, a general color cathode ray tube is fused to a panel 2 having R, G, and B fluorescent films 1 coated on its inner surface, and fused to a rear end of the panel 2 to form an inside of the cathode ray tube. A funnel (3) kept in a vacuum state, an electron gun (5) enclosed in the neck (4) of the funnel (3) to emit an electron beam, and an electron beam emitted from the electron gun (5) to the entire area of the screen A deflection yoke 6 for deflecting, a shadow mask 7 having a color discriminating function of the electron beam, an inner shield 8 for shielding an external geomagnetic field, and the shadow mask 7 and inner shield 8 It consisted of the frame 9 which supports.

In the configuration of the fluorescent film 1, the black matrix layer 10 and the three-color mixed filter layer 11 are applied to the inner surface of the panel 2, as shown in FIG. R, G, and B phosphor layers 13R (13G) 13B and a metal reflective film 14 are formed.

In the method of forming the fluorescent film 1, first, a photoresist film is uniformly applied to the panel 2, exposed using a shadow mask, and then the photoresist film is removed using pure water. The black matrix layer 10 is formed by coating graphite, which is a black substance, and drying it, followed by swelling and developing the cured photoresist film using an etching solution such as an oxidizing agent aqueous solution.

After forming the black matrix layer 10 on the panel 2, a three-color mixed filter layer 11 is formed to improve the luminance of the fluorescent film, and a precoat layer is formed thereon to improve the adhesion between the three-color filter layer and the fluorescent film. (12) is formed, and then green phosphor layer 13G, blue phosphor layer 13B, and red phosphor layer 13R are formed, respectively.

Thereafter, the metal reflective film 14 for reflecting the electron beam deviating in the rearward direction is formed on the three-color phosphor layers 13R (13G) 13B to complete the configuration of the fluorescent film 1.

Table 1 below shows the components of each color (green, blue, red) of the suspension for forming the three-color mixed filter layer (11).

TABLE 1

In addition, the components of the suspension for forming the precoat layer 12 are shown in Table 2 below.

TABLE 2

In this state, the electron beam emitted from the electron gun 5 emits the fluorescent films 1 of R, G, and B to obtain an image.

However, in the conventional fluorescent film structure, when the precoat layer is formed on the three-color mixed filter layer, the manufacturing process is complicated and difficult to manage, and the adhesion force of the fluorescent film is reduced due to the decrease in the adhesion between the precoat layer and the three-color filter layer. A film dropout phenomenon occurs, and as shown in FIG. 3, a film cutting state of the fluorescent film is deteriorated, and phosphor particles remain in other colors (residues), thereby degrading the quality and luminance of the fluorescent film.

In view of this point, the present invention simplifies the manufacturing process by adding a precoated liquid component colloidal silica, polystyrene latex, and polyvinyl alcohol to form a three-color mixed filter suspension layer, thereby eliminating the fluorescent film. In addition, the present invention aims to improve the fluorescent film cutoff phenomenon and to solve the problem of phosphor particles remaining in other colors (residues) and consequently to improve the quality and luminance of the fluorescent film.

1 is a block diagram of a general color cathode ray tube.

Figure 2 is a conventional fluorescent surface configuration diagram.

3 is a cross-sectional view of a conventional fluorescent surface;

(A) is green fluorescent film formation state.

(B) is tricolor fluorescent film formation state.

4 is a manufacturing process diagram of a fluorescent film according to the present invention;

(A) The three-color mixed filter suspension layer was formed in the upper part of a black matrix.

(B) The three-color fluorescent substance layer was formed in the upper part of a three-color mixed filter suspension layer.

(C) is a state in which a metal reflective film is formed on the three-color phosphor layer.

5 is a cross-sectional view of the fluorescent screen according to the present invention;

(A) is green fluorescent film formation state.

(B) is tricolor fluorescent film formation state.

<Description of Symbols for Main Parts of Drawings>

101: panel 102: black matrix layer

103: three-color mixed filter suspension layer 104G: green phosphor layer

104B: blue phosphor layer 104R: red phosphor layer

105: metal reflective film

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a manufacturing process diagram of a fluorescent film according to the present invention, in which a black matrix layer 102 is formed on an inner surface of a panel 101, and a three-color mixed filter suspension layer 103 is formed thereon. The layer 103 is formed by mixing a precoat solution with a three-color mixed filter solution (green, blue, red), and the precoat solution is composed of colloidal silica, polystyrene latex, and polyvinyl alcohol.

After the three-color mixed filter suspension layer 103 is formed, the green phosphor slurry is applied, dried, exposed, and developed to form a green phosphor layer 104G, and in the same manner, a blue and red phosphor layer 104B ( 104R) are formed in order, an emulsion film is applied, and then a metal reflective film 105 is deposited to complete a clean fluorescent film as shown in FIG. 5.

The composition of the three-color mixed filter suspension is shown in Table 3 below.

TABLE 3

As described above, in the present invention, a suspension obtained by adding the precoat solution to the three-color mixed filter solution is directly formed on the inner surface of the panel 101 on which the black matrix layer 102 is formed. It is possible to provide a fluorescent film with better film cutting and reduced staining.

Hereinafter, the embodiment through the experiment will be described in detail.

0.1 wt% of polystyrene latex, 0.1 wt% of colloidal silica, and 0.05 wt% of polyvinyl alcohol (Example 1) were added to the three-color filter liquid (6.0 wt% of green pigment, 13.0 wt% of blue pigment, and 3.0 wt% of red pigment). The black matrix layer 102 after stirring for 1 hour or more by combining a liquid with 1.5 wt% of polystyrene latex, 0.15 wt% of colloidal silica, and 0.1 wt% of polyvinyl alcohol (Example 2) to the three-color filter solution. The green phosphor layer 104G, the blue phosphor layer 104B, and the red phosphor layer 104R were formed by injecting into the completed panel 101 glass, recovered and dried, and the results thereof are shown in Tables 4 and 5.

TABLE 4

TABLE 5

As shown in Table 4 and Table 5, in the case of the conventional products, the film quality is reduced due to a lot of film cutting property, incorporation of phosphors, and stains, but in the present invention, it can be seen that the film quality and luminance are improved by about 3 to 4% compared to the conventional products. .

Here, the polystyrene latex added to the three-color mixed filter liquid prevents diffuse reflection during photocuring after the formation of the fluorescent film, and its amount is suitably 1.0 to 1.5 wt%, and if the amount is too large, the dispersibility of the three-color mixed filter suspension If the amount is too small to cause film staining, and the addition amount is too small, the effect of preventing the reflection is poor, and the defect of the phosphor particles remaining in the other color due to the diffuse reflection of light during the photocuring reaction occurs.

In addition, the addition amount of colloidal silica is appropriate from 0.1 to 0.15 wt%. If the amount is too large, the adhesion of the fluorescent film is too strong, and the phosphor of different colors is mixed, and the luminance decreases. If the addition amount is too small, the adhesion of the fluorescent film is weak. Dropping or roughening of the fluorescent film may occur.

Polyvinyl alcohol plays a role of film formation, and it is preferable to add the minimum amount of film formation. If the amount is large, the amount of gas released during high temperature pyrolysis (450 ° C.) increases, causing a problem that the metal reflective film swells.

As described above, in the present invention, by adding a precoat liquid component to the three-color mixed filter liquid to form a film, the workability and productivity are improved by simplifying the process, and the cutting of the fluorescent film is improved. Rigid body mixing (residue) can be prevented, and the brightness improvement effect is about 3 to 4% compared with the conventional product.

Claims (4)

A process of forming a black matrix layer on the inner surface of the panel, and a precoat liquid mixed with a three-color (red, green, blue) mixed pigment to form a three-color mixed filter layer to prepare a suspension, and the prepared three-color mixed filter A process for forming a three-color mixed filter layer by using a suspension, and a process for forming a three-color (red, green, blue) phosphor layer. In the method of manufacturing a fluorescent film of a color cathode ray tube which forms a black matrix layer on the inner surface of the panel, and then forms a three-color mixed filter layer and forms respective phosphor layers thereon, the suspension for forming the mixed filter layer is a green pigment, A composition of a three-color mixed filter suspension for color cathode ray tubes, characterized in that a precoat liquid is mixed with a filter liquid in which a red pigment and a blue pigment are mixed. The composition of claim 3 or 2, wherein the precoat liquid is composed of polystyrene latex, colloidal silica, and polyvinyl alcohol. The method of claim 3, wherein the weight of the polystyrene latex is 1.0 to 1.5wt%, the weight of collidal silica is 0.1 to 0.15wt%, the weight of polyvinyl alcohol is 0.05 to 0.1wt% The three-color mixed filter suspension composition for color cathode ray tubes to be made.