JPH054773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing a black matrix type color picture tube, and particularly to a method for forming a black matrix film therefor.

[Prior art]

The phosphor surface of this type of color picture tube is used for the purpose of obtaining high contrast, and is generally comprised of gaps between dots or stripes of red, green, and blue phosphors arranged in a predetermined manner. It has a structure in which a light-absorbing film made of a non-light-emitting/light-absorbing substance such as graphite is formed on the top.

When forming such a fluorescent surface, first, a photoresist film is formed on the inner surface of the face plate of the color picture tube panel, and after drying, it is exposed to light through a shadow mask and developed to form a matrix-like photoresist. form a layer. Next, after graphite is applied to the inner surface of the face plate in this state, etching is performed to form a black matrix film. A thin undercoat layer of water-soluble polymeric material is then formed to cover the inner surface of the faceplate, including the black matrix film. Next, each phosphor slurry for green, blue, and red light emission is applied, and after each color is exposed to light through a shadow mask, the non-exposed areas are dissolved by development with hot water, and a phosphor image of the desired shape is created. A phosphor layer is formed by depositing a phosphor layer. Subsequently, an organic resin film is formed on these phosphor layers, and then an aluminum vapor-deposited film is formed. Thereafter, the panel is fired to thermally decompose the organic resin film to form a fluorescent surface as a color picture tube.

However, according to the above-mentioned method for forming a black matrix film, the formation process is extremely complicated and includes coating of photoresist, drying, exposure, development of photoresist, drying, coating of graphite, drying, treatment with etching solution, development, and drying. Requires a long process. Further, there were other problems such as the need for dangerous chemicals such as sodium hypozinc oxide and hydrogen peroxide as etching solutions.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to omit the conventionally necessary etching process and to form a black matrix film in a simple and safe manner. An object of the present invention is to provide a method for manufacturing a black matrix type color picture tube.

[Summary of the invention]

In order to achieve this object, the present invention forms a black matrix film by forming a water repellent layer only on the exposed and hardened portion of the photoresist layer to repel graphite.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

FIGS. 1 to 5 are cross-sectional process diagrams illustrating an example of a method for forming a black matrix film in the method for manufacturing a black matrix type color picture tube according to the present invention. In these figures,
First, as shown in FIG. 1, a photocurable photoresist is uniformly applied to the inner surface of the face plate 1.
A photoresist layer 2 is formed by drying. Next, as shown in FIG.
A predetermined position is exposed with a point or linear light source (not shown) through a shadow mask 4 so that the light 3 hits the position where each color phosphor should emit light, and the photoresist layer 2a in the exposed area is exposed. Let it harden. In this case, the photoresist layer 2b in the non-exposed areas is not hardened. Subsequently, as shown in FIG. 3, a water repellent solution such as a silicone water repellent is applied to the entire inner surface of the face plate 1 and dried, and the water repellent is applied to the entire upper surface of the exposed photoresist layers 2a and 2b. Form layer 5. Next, this photoresist layer 2a,
The photoresist layer 2b and the water repellent layer 5 on its upper surface are spray-developed with hot water to remove only the unexposed and uncured portions of the photoresist layer 2b and the water repellent layer 5 on its upper surface, and then the photoresist layer 2b and the water repellent layer 5 on its upper surface are removed. After forming the photoresist layer 2a in the exposed and hardened portion at the position where the phosphor is to emit light and the water repellent layer 5a on its upper surface, a non-luminescent layer is applied to the entire inner surface of the face plate 1 as shown in FIG. A graphite suspension is applied as an absorbing material and dried to form a graphite layer 6, thereby forming a black matrix film. In this case, since the water repellent layer 5a is formed on the upper surface of the photoresist layer 2a in the exposed area, the graphite, which is an aqueous dispersion, is not attached to the exposed area but only on the face plate surface of the non-exposed area. It will adhere to.

This will be explained below using a specific example.

First, a photocurable photoresist layer is formed on the inner surface of the face plate of a 14-inch color picture tube panel. In this case, it is desirable that the photoresist layer is thermally decomposable so as to be burnt out in the subsequent baking process, such as polyacrylamide diacetonamide (PAD)-bisazide,
Polyvinyl alcohol (PVA) sodium dichromate-based or polyacrylamide (PAA) −
A photosensitive aqueous solution of polyvinylpyrrolidone (PVP)-bisazide is applied onto the inner surface of the face plate using a spin coating machine at a rotation speed of approximately 200 rpm.
A photoresist layer having a thickness of about 0.5 to 1.0 μm is formed by drying with an infrared heater. Next, on the exposure table equipped with a shadow mask, the exposure intensity is approximately 3W/
m ² for about 25 seconds to harden only the exposed portions of the photoresist layer. Next, a silicone water repellent is applied to the entire inner surface of the face plate and dried to form a water repellent layer. In this case, the silicone water repellent used here includes, for example, Toray Silicon SH237, PRX305, SH8011, which contains a dimethylpolysilyloxane compound or a methylhydrodiene polysiloxane compound.
SD8000, SH7024, BY22-812, SH8701, etc. are suitable. Next, hot water at about 40° C. is injected onto the entire surface of the photoresist and water repellent layer at a pressure of about 2.5 kg/cm ² for about 90 seconds using a sprayer with a nozzle diameter of 0.5 mm to perform hot water development. In this case, only the exposed and hardened photoresist layer and the water repellent layer on its upper surface remain, and the unexposed and unhardened portion is completely removed to expose the face plate surface. Subsequently, a graphite suspension containing approximately 5 wt% graphite was applied to a thickness of 0.3 to 3.0 μm over the entire inner surface of the face plate on which the remaining picture elements of the photoresist layer and the water repellent layer remained, and heated with an infrared heater. Heat and dry at about 50℃ for about 2 minutes. In this case, since a water repellent layer is present on the upper surface of the photoresist layer in the exposed area, the graphite is repelled and adheres only to the exposed portion of the face plate surface, forming a black matrix film.

According to such a formation method, a black matrix film having properties equivalent to those of the conventional method can be obtained by omitting the etching process of the unexposed and uncured portion of the photoresist layer before applying graphite and the etching process of the graphite layer. Therefore, the process for forming the black matrix film can be greatly shortened, and there is no need to use dangerous etching solutions, making it possible to achieve highly safe production.

〔Effect of the invention〕

As explained above, according to the present invention, an etching process is not necessary compared to the conventional method.
The process of forming a black matrix film can be significantly shortened, safety is increased, and production costs can be significantly reduced, which are extremely excellent effects.

[Brief explanation of the drawing]

1 to 5 are cross-sectional process diagrams of essential parts for explaining an example of a method for manufacturing a black matrix type color picture tube according to the present invention. 1...Face plate, 2...Photoresist layer, 2a...Photoresist layer in exposed area, 2b
... Photoresist layer in non-exposed area, 3 ... Light, 4
...Shadow mask, 5...Water repellent layer, 5a...
Water repellent layer remaining on exposed area, 6...Graphite layer.

Claims (1)

[Claims] 1. A method for manufacturing a black matrix type color picture tube in which a black matrix film is formed on the inner surface of the face plate of a color picture tube panel, in which the inner surface of the face plate has a thickness of 0.5 to 1.0 μm.
a step of forming a photoresist layer of m, an exposure step of exposing and curing the pixel portion on which a phosphor pixel is to be formed on the photoresist layer through a shadow mask, and a step of curing the photoresist layer through a shadow mask; a step of coating and forming a silicone water repellent layer containing either a dimethylpolysilyloxane compound or a methylhydrodienepolysiloxane compound, covering the photoresist layer excluding the picture element portion of the photoresist layer and the photoresist layer thereon; The above-mentioned silicone water repellent layer is developed and removed by injecting warm water at about 40°C at a pressure of about 2.5 kg/cm ² to remove the picture element area consisting of the photoresist layer and the water repellent layer in the exposed area. A graphite suspension containing about 5 wt% of graphite is applied to the inner surface of the face plate on which the picture elements of the photoresist layer are formed to a thickness of 0.3 to 3.0 μm to make the picture elements water repellent. A black matrix film is formed by forming a black matrix film by repelling only the graphite on the agent, drying it, and depositing a graphite film on the inner surface of the face plate excluding the picture element areas. A method of manufacturing a matrix color picture tube.