KR100496271B1 - Composition for protective resin layer and manufacturing method of phosphor layer for crt using the same - Google Patents

Abstract

The present invention relates to a composition for protective resin films capable of exposing and developing the filter layer and the fluorescent film in only one time, and a method for producing a fluorescent film for cathode ray tube using the same. The protective resin film composition includes a photocurable polymer, a film former, a dispersant, a pigment, and a solvent, wherein the mixed weight ratio of the photocurable polymer and the film former is 0.1: 1 to 10: 1. When the fluorescent film of the cathode ray tube is manufactured according to the present invention, the filter layer and the fluorescent film can be simultaneously exposed and developed, thereby simplifying the manufacturing process, thereby reducing manufacturing time and cost. In addition, the contrast and brightness of the screen is greatly improved.

Description

Composition for protective resin layer and manufacturing method of phosphor layer for CRT using the same}

The present invention relates to a protective resin film composition and a method of manufacturing a fluorescent film for a cathode ray tube using the same, and more particularly, a protective resin composition for exposing and developing a fluorescent film and a filter layer at the same time, and a cathode ray simplified manufacturing process using the same. A method for producing a conventional fluorescent film.

Referring to Figure 1, look at the configuration of the fluorescent film of the conventional color cathode ray tube as follows.

On the inner surface of the panel 11 of the color cathode ray tube, a black matrix 12 formed at regular intervals for absorbing external light, a fluorescent film 13a, which emits streaked light by collision with an electron beam between the black matrix 12 ( 13b) and 13c are formed.

As a method for preventing a decrease in reflectance of the fluorescent film itself formed on the panel 11 and improving contrast and brightness, a method of coating a pigment having a fine size on the surface of the phosphor is commonly used.

However, this method has limitations in improving contrast and brightness. That is, when the content of the pigment relative to the phosphor is increased to improve the contrast, the luminance is relatively lowered, and when the content of the pigment is reduced to the phosphor to improve the brightness, the contrast is lowered.

Recently, semi-tint panels or dark-tint panels with low transmittance are mainly used as cathode ray tube panels. However, when the panel is used, the contrast is improved, but the luminance is relatively lowered. Therefore, the panel needs to be improved.

In order to solve the above-described problems, as shown in FIG. 2, the first color, the second color, and the same color as the phosphor are formed between the panel 21 and the fluorescent films 23a, 23b, and 23c. A method of forming the third color filter layers 24a, 24b and 24c, respectively, has been proposed. Here, the cathode ray tube panel uses a clear panel having a high transmittance, and the phosphor forming the fluorescent film uses a white phosphor that is not coated with a pigment.

By the way, the cathode ray tube which employ | adopted the above filter layer has the following problems.

First, the process of manufacturing each color filter layer is added, and manufacturing cost rises.

When the second color filter layer is formed after forming the first color filter layer and the fluorescent film, the second color pigment contained in the composition for forming the second color filter layer is sandwiched between the first color phosphor particles and subsequently removed. Difficult to do Here, since the particle size of the pigment is usually 100 nm, the size of the phosphor particles is 7 to 8 µm, so that the phenomenon of the pigment is sandwiched between the phosphor particles.

In order to solve this problem, a method of forming a protective resin film between the filter layer and the fluorescent film has been proposed. That is, an attempt was made to solve the problem that the second color pigment particles in the composition for forming the filter layer were interposed between the first color phosphor particles by filling the empty space between the first color phosphor particles using the protective resin film in advance.

The general protective resin film is formed of a composition such as a photocurable polymer, a dispersant, a solvent, a surfactant, and a pigment. By the way, in the case of using the composition for the protective resin film known so far has to go through two exposure and development steps each time the filter layer and the fluorescent film of each color has a problem that is very cumbersome in manufacturing.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a composition for protecting resin films that can solve the above problems and expose and develop the filter layer and the fluorescent film once.

Another technical problem to be achieved by the present invention is to provide a method for producing a fluorescent film for cathode ray tube using a very simple manufacturing process.

The first object of the present invention is a protective resin film composition comprising a photocurable polymer, a film forming agent, a dispersant, a pigment and a solvent, wherein the mixing weight ratio of the photocurable polymer and the film forming agent is 0.1: 1 to 10: 1. It is achieved by providing a protective resin film composition.

The second object of the present invention is the step of (a) applying a composition for forming a first color filter on the inner surface of the color cathode ray tube panel; (b) applying a composition for forming a first color phosphor; (c) applying a composition for protective resin film comprising a photocurable polymer having a mixing weight ratio of 0.1: 1 to 10: 1, a film forming agent, a dispersant, a first color pigment, and a solvent; (d) exposing and developing the resultant to form a first color fluorescent film; And (e) repeating the above process for the second color and the third color to form the second color and the third color fluorescent film.

The present invention provides a protective resin film composition capable of exposing and developing the filter layer and the fluorescent film only once. In order to have such characteristics, the following conditions must be satisfied.

First, there should be little residue after development, so as not to affect the subsequent formation of the filter layer and the fluorescent film, so as not to reduce the exposure sensitivity of the filter layer and the fluorescent film.

Second, in order to have excellent affinity for the fluorescent film, it is made of a material having excellent hydrophilicity and adhesion.

Third, no staining should occur and no bubbles should be created.

Although it does not restrict | limit especially as a photocurable polymer used by this invention, polyvinyl alcohol, polyvinylpyrrolidone, etc. are mainly used. The film-forming agent used at this time is an acrylic emulsion solution, a cellulose-based, etc. Among them, it is most preferable to use an acrylic emulsion solution. The reason is that under such conditions, not only the coating property and the adhesive property of the protective resin film are excellent, but also problems such as mixed color, in which residues of the second color filter layer components remain on the first color fluorescent film, can be solved.

The mixing ratio of the photocurable polymer and the film forming agent has a very important influence on the residue of the second color filter layer component on the first color fluorescent film, the coating property of the protective resin film, and the like. Therefore, it is very important to determine the appropriate mixing ratio between the two components, the preferred mixing weight ratio is 0.1: 1 to 10: 1.

In addition, it is essential to properly control the content of the dispersant so that the protective resin film does not affect the exposure sensitivity of the filter layer and the fluorescent film. The proper content of the dispersant is 0.01 to 1.0% by weight, and when the content of the dispersant exceeds 1.0% by weight, the exposure sensitivity of the filter layer and the fluorescent film is lowered. If the content of the dispersant is less than 0.01% by weight, dispersibility is poor, which is not preferable.

It is preferable to use a carboxylic acid type or a citric acid type anionic surfactant as a dispersing agent.

Hereinafter, a method of forming a cathode ray tube fluorescent film using the protective resin film composition according to the present invention will be described.

The first color filter-forming composition is applied to the inner surface of the color cathode ray tube panel, and then the first color phosphor-forming composition is applied.

Subsequently, a composition for protective resin film comprising a photocurable polymer having a mixed weight ratio adjusted to a range of 0.1: 1 to 10: 1, a film forming agent, a dispersant, a first color pigment, and a solvent is applied. The resultant is then exposed and developed.

Thereafter, the above-described process is repeated for the second and third colors to form a fluorescent film as shown in FIG.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited only to the following Examples.

<Example 1>

The composition for forming a red filter was applied to the inner surface of the color cathode ray tube panel, and then the composition for forming a first color phosphor was applied. Subsequently, the composition for protective resin films containing 1: 3 mixed weight ratio polyvinyl alcohol and an acrylic emulsion solution, a dispersing agent, a 1st color pigment, and a solvent was apply | coated, and it exposed and developed.

After that, the process was repeated for the second and third colors.

<Example 2>

The same procedure as in Example 1 was carried out except that the mixing weight ratio of the polyvinyl alcohol and the emulsion solution was 1: 1.

Comparative Example 1

The same procedure as in Example 1 was conducted except that the mixing weight ratio of the polyvinyl alcohol and the emulsion solution was 0.01: 1.

Comparative Example 2

The same procedure as in Example 1 was conducted except that the mixing weight ratio of the polyvinyl alcohol and the emulsion solution was 100: 1.

In the fluorescent film prepared according to Example 1-2 and Comparative Example 1-2, the presence or absence of the second color filter layer component on the first color fluorescent film, the presence or absence of the protective resin film after development and the coating properties of the protective resin film Measured.

In the case of Example 1-2, the second color filter layer component did not remain on the first color fluorescent film after development, and the protective resin film did not remain after development. In addition, the coating property of the protective resin film was very excellent.

On the other hand, in Comparative Example 1, although the second color filter layer component did not remain on the first color fluorescent film after development, the protective resin film remained after development and the coating property of the protective resin film was poor. In Comparative Example 2, the protective resin film did not remain after development and the coating property of the protective resin film was excellent, but the second color filter layer component remained entirely on the first color fluorescent film (about 100%).

The contrast and luminance characteristics of the cathode ray tube employing the fluorescent film according to Example 1-2 and Comparative Example 1-2 were measured.

As a result, it was found that in Example 1-2, the luminance was 125% and the contrast was 100%, and the luminance was superior to that of Comparative Example 1-2 (luminance: 115%, contrast: 100%).

In addition, in Comparative Example 1-2, while the filter layer and the fluorescent film should be exposed and developed, respectively, according to Example 1-2, the filter layer and the fluorescent film can be simultaneously exposed and developed. It was possible to prevent the phenomenon that the pigment particles constituting the second color filter layer interposed between the phosphor particles to form.

When the fluorescent film of the cathode ray tube is manufactured according to the present invention, the filter layer and the fluorescent film can be simultaneously exposed and developed, thereby simplifying the manufacturing process, thereby reducing manufacturing time and cost. In addition, the contrast and brightness of the screen are greatly improved.

1 is a block diagram of a fluorescent film of a conventional color cathode ray tube,

2 is a view showing the structure of a conventional fluorescent film for cathode ray tube manufactured according to the filter screen method.

<Explanation of symbols for the main parts of the drawings>

11, 21 ... Panel 12, 22 ... Black Matrix

13a, 23a ... first color fluorescent film 13b, 23b ... second color fluorescent film

13c, 24c ... Third Color Fluorescent Film 24a ... First Color Filter Layer

24b ... second color filter layer 24c ... third color filter layer

Claims (2)

In the composition for protective resin film containing a photocurable polymer, a film forming agent, a dispersant, a pigment and a solvent, The mixing weight ratio of the photocurable polymer and the film forming agent is 0.1: 1 to 10: 1, The photocurable polymer is polyvinyl alcohol or polyvinylpyrrolidone, The film forming agent is an acrylic emulsion or cellulose-based, The dispersant is a carboxylic acid-based or citric acid-based anionic surfactant, The protective resin film composition for simultaneously exposing and developing the fluorescent film and the filter layer of the cathode ray tube, characterized in that the content of the dispersant is 0.01 to 1.0% by weight in the total composition. (a) applying a composition for forming a first color filter on the inner surface of the color cathode ray tube panel; (b) applying a composition for forming a first color phosphor; (c) coating a protective resin film composition for simultaneously exposing and developing a fluorescent film and a filter layer of a cathode ray tube including a photocurable polymer, a film forming agent, a dispersant, a first color pigment and a solvent; (d) exposing and developing the resultant to form a first color fluorescent film; And (e) repeating the above process for the second color and the third color to form a second color and a third color fluorescent film, The mixing weight ratio of the photocurable polymer and the film forming agent is 0.1: 1 to 10: 1, The mixing weight ratio of the photocurable polymer and the film forming agent is 0.1: 1 to 10: 1, The photocurable polymer is polyvinyl alcohol or polyvinylpyrrolidone, The film forming agent is an acrylic emulsion or cellulose-based, The dispersant is a carboxylic acid-based or citric acid-based anionic surfactant, The content of the dispersant is a method for producing a fluorescent film for cathode ray tube, characterized in that 0.01 to 1.0% by weight in the total composition.

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