KR19990030634A - Precoat liquid composition for color cathode ray tube - Google Patents

Abstract

In the fluorescent surface having a filter layer between the phosphor layer and the panel inner surface of the present invention, a slurry in which green, blue and red color pigments are dispersed at the same time is applied to the inner surface of the panel, and a precoat liquid containing SPP as a main component is applied to the fluorescent film. To improve the quality and to improve the brightness. The constitution of the present invention is a fluorescent film in which a BM layer and a filter layer are formed on an inner surface of a color cathode ray tube, and a precoat liquid is coated on the three-color mixed filter layer and a fluorescent film is formed thereon. It is a precoat suspension composition based on colloidal silica.

Description

Precoat liquid composition for color cathode ray tube

In the present invention, a fluorescent film having a pigment layer between a phosphor layer and an inner surface of a panel is coated with a slurry obtained by simultaneously dispersing three pigments of green, blue, and red on the inner surface of a panel, and a precoat liquid containing SPP as a main component is applied to the fluorescent film. To improve the quality and to improve the brightness.

Referring to the configuration of a general color cathode ray tube, as shown in FIG. 1, a shadow mask having a color discrimination function of a panel 1 mounted on a front surface of a cathode ray and an electron beam incident from the inside of the panel 1 is provided (6). ), A frame 7 fixedly supporting the shadow mask 8, a funnel 2 coupled to the rear surface of the panel 1 to keep the interior in a vacuum state, and a rear of the funnel 2; A retracted tubular neck portion 2a, an electron gun 4 mounted therein to emit an electron beam 3, and a frame 7 to block an external magnetic field acting on the emitted electron beam 3 The inner shield 8 to be assembled and the deflection yoke 5 surrounding the outer side of the funnel 2 and deflecting the electron beam are constituted.

The inner surface of the panel 1 is formed with a section steel surface, which is shown in FIG. 2, which has a black matrix layer (BM layer) 2 and a filter layer 3 of a mixture of red, green, and blue colors. It is formed of the precoat layer 4, the respective R, G, and B phosphor layers 5R, 5B, 5G, and the aluminum film 6 to generate red, green, and blue phosphors of the electron beam to obtain an image.

At this time, when forming the R, G, B phosphor film, the phosphor slurry is a material having cationicity, using a water-soluble vertical SPP as a photosensitizer.

SPP: Chemical structural formula of copolymer of polyvinyl alcohol (PVA) and vinyl acetate, 4- [2- (4formilphenyl) ethenyl] -1-methylpyridinium salt and acetalized material SPP

In the conventional method of manufacturing a fluorescent surface, a red, blue, and red color mixture of the filter layer 3 and the precoat layer 4 is formed on the panel 1 on which the BM layer 2 is formed, and no pigment is deposited thereon. The phosphor is used to form a fluorescent surface, which is advantageous in that contrast is improved because external light is absorbed by the three-color mixed filter layer.

However, in this case, when the precoat layer 4 is formed on the three-color mixed filter layer 3, the adhesion force of the fluorescent film is dropped due to the decrease in the adhesion force with the three-color filter layer 3, thereby causing a large number of film dropout shapes. There is a problem in that the cutting state of the fluorescent film is bad and the phosphor particles remain in other colors (residues), so that the quality of the fluorescent film is degraded and the luminance is lowered.

The present invention is invented to solve the problems of the prior art as described above, by changing the precoat liquid composition to form, thereby improving the fall off of the fluorescent film and the cutting of the fluorescent film (cutting) and solve the problem of residual (residue) The purpose is to raise the quality of the fluorescent film and to improve the brightness.

1 is a schematic diagram of a typical cathode ray tube.

Figure 2 is a conventional fluorescent film structure diagram.

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

4 shows the structure of the fluorescent film of the present invention,

(A) is a state where the filter layer was apply | coated on the BM layer.

(B) is a state in which a precoat film and a phosphor are coated on a filter layer.

(C) is a state in which a fluorescent film is completed.

5 is a cross-sectional view of the fluorescent surface of the present invention.

<Description of Symbols for Main Parts of Drawings>

101 panel 102 BM layer (Brack Matrix)

103 filter 104 precoat film

106; Aluminum film

When described in detail with reference to the accompanying drawings the configuration of the present invention for achieving this object are as follows.

As shown in FIG. 4, the present invention has a filter layer 103 between the panel inner surface 101 on which the BM layer 102 is formed and the phosphor layers R, G, and B, and a precoat film 104 on the filter layer. In the fluorescent surface, a precoat liquid mainly composed of SPP, which is a water-soluble photosensitive resin, is formed on the three-color filter layer.

In the conventional precoat liquid, a solution in which polyvinyl alcohol (PVA), polystyrene latex, colloidal silica, and the like are combined with pure water is used. (See Table 1)

The precoat liquid of this invention uses the solution which combined SPP and colloidal silica with pure water (refer Table 2).

TABLE 1

Conventional precoat liquid

TABLE 2

Precoat liquid of the present invention

As SPP, which is a water-soluble photosensitive resin, enters into the conventional phosphor slurry, SPP is ion-adsorbed to the phosphor particles, so that the phosphor slurry bears a cation and adheres well onto the tricolor mixed filter layer 103.

Thus, the attached phosphor has a strong adhesion even without photocuring, and thus does not fall well even when developed. Thus, as shown in FIG. 3, the cutting of the film is bad and the mixing of the fluorescent film (residue) occurs badly.

In the present invention, the SPP, which is a photosensitive agent added to the phosphor slurry, is added to the precoat solution and coated on the three-color mixed filter layer 103, so that the three-color mixed filter layer has a cationic property. As a result, the adhesiveness is slightly lowered, so that the unexposed part is well developed during the development of the fluorescent film, so that the film is well cut and the phosphor remains in other colors as shown in FIG. 5.

The following example will be described in detail.

Solid content of SPP, colloidal silica, and pure water of photosensitive resin was combined into 0.6: 0.6: 100 (Example 1) and 0.9: 9.5: 100 (Example 2), followed by stirring for at least 1 hour. Injected into the finished panel glass, recovered and dried to form green (5G), blue (5B) and red (5R), and the results are as shown in Table 3 (Table 3). Got it.

TABLE 3

Fluorescent film status

TABLE 4

Luminance measurement result

As shown in Tables 3 and 4, in the case of the conventional products, the film quality is deteriorated due to the high cutting property and the incorporation of phosphors (residues). However, in the present invention, the film quality and brightness are improved by improving the precoat liquid. 5% improvement.

In the present invention, as shown in FIG. 4, a black matrix film 102 is formed, a three-color mixed filter layer 103 is formed thereon, and a precoat film 104 'is formed, followed by applying a green phosphor slurry and drying, When the exposure and development are carried out, a green light film 5G is formed.

In the same manner, a blue (5B) and a red (5R) fluorescent film are formed in order, an emulsion film is applied, and then a metal oxide film 106 is deposited to produce a clean fluorescent film as shown in FIG. 5.

The precoat film 104 'uses SPP, which is a photosensitive agent used for phosphor slurry combination, and a solid content ratio of 0.9: 0.5: 100 is suitable.

If the amount of SPP, which is a photosensitive resin, is too high, the amount of polyvinyl alcohol increases and the amount of gas released during high-temperature pyrolysis increases, causing the metal reflective film 106 to swell. If the amount is too small, the cutting of the fluorescent film becomes worse. In addition, since a lot of phosphors (residues) are generated and mixed in other colors, the quality of the film is degraded and the brightness is reduced.

When the solid content of colloidal silica is 0.3% or less, the adhesive force of the fluorescent film is lowered, causing the fluorescent film to fall off.

In addition, if it is more than 0.8%, the adhesive force is too strong, causing the mixing of the fluorescent film, resulting in a decrease in luminance.

As described above, by using SPP, which is a photosensitive agent added to the phosphor slurry, the precoat composition of the present invention can improve the cutting property of the fluorescent film and prevent the incorporation of the phosphor (residue), and the brightness is 3-5%. There is an effect of improvement.

Claims (2)

In the fluorescent film manufacturing method in which the BM layer 102 and the filter layer 103 are formed in the inner surface of the panel of a color cathode ray tube, the precoat liquid 104 is coated on the said three-color mixed filter layer, and a fluorescent film is formed thereon, The precoat layer is a precoat suspension composition mainly comprising SPP and colloidal silica. According to claim 1, A solid content ratio of SPP, colloidal silica and pure water is (0.6-1.4) :( 0.3-0.8): 100.