JPH0398237A - Manufacture of color fluorescent substance face - Google Patents

Abstract

PURPOSE:To effectively manufacture a fluorescent substance face with a high fine pattern by cutting a lamination laminated with filmed substances, each composed of burning-available organic binder composition in which a fluorescent substance colored red, green or blue or carbon is uniformly diffused, in a filmed shape in thickness to burn such a cut piece after adhered to a front panel for a cathode ray tube. CONSTITUTION:An organic solvent diluted substance of organic binder in which a fluorescent substance is diffused is applied using an application technique by a roll coater, etc., a screen printing technique or the like, and then organic solvent is dried and removed, thereby to obtain a filmed substance. The filmed substances are laminated in the order of red 1, carbon 4, green 2, carbon 4, blue 3, and carbon 4. A resulting lamination A is cut in thickness, so that a fluorescent substance film B arrayed in the order of red, carbon, green, carbon, blue, and carbon can be obtained. The fluorescent substance film B is burned after adhered or pressed to a front panel for a color cathode ray tube, so that a color fluorescent substance face can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for efficiently manufacturing a color phosphor surface for forming a light emitting display surface of a color cathode ray tube (hereinafter abbreviated as CRT).

[Conventional technology] In CRTs, typified by the cathode ray tubes in televisions, an electron beam emitted from an electron gun collides with the surface of a phosphor film, which excites the phosphor and produces a light-emitting display. Due to the diversification of equipment, a variety of types are being produced, from color to monochrome, large to ultra-small.

The phosphor surface, especially the color phosphor surface, which is the most important part for demonstrating the performance of such a CRT, generally has phosphors of three colors red, green, and blue arranged in dots or stripes, and It displays light by emitting lines, and conventionally known manufacturing methods include a photocuring method using a shadow mask and a printing method. The former photocuring method involves pouring a slurry of phosphors dispersed in a photocuring resin onto the front panel of a CRT, exposing it to light through a shadow mask, fixing the phosphor of a predetermined color in a predetermined location, and then This is a method of manufacturing a phosphor surface by burning the fixed resin portion other than the phosphor, and a shadow mask is essential.

In addition, in the latter printing method, the color phosphor paste for printing is
This is a method of producing a phosphor surface by directly or indirectly printing on the RT front panel, fixing a predetermined color in a predetermined location, and then baking the binder resin in the paste.

[Problems to be Solved by the Invention] In the conventional method for manufacturing the above-mentioned phosphor screen, the former photocuring method requires a shadow mask carved with fine patterns. The more a screen is required, the more highly accurate a shadow mask is required, which is accompanied by technical difficulties and increases costs in terms of materials and productivity. In addition, the former method of manufacturing a phosphor surface using a photocuring method using a shadow mask has the drawbacks of high equipment costs, time-consuming work such as recovering the phosphor, and large losses. The latter printing method is an industrially advantageous method because it has lower equipment costs and less loss of phosphor than the photocuring method, but it does not require direct shaping onto a curved surface or a height of 0.1 mm or less. It is difficult to manufacture a small, high-resolution color phosphor surface that requires a precise stripe pattern in terms of printing suitability, and is therefore undesirable. For this reason, this method is currently not used as an industrial manufacturing method for color phosphor surfaces when obtaining small-sized, high-resolution phosphor surfaces.

In view of this situation, an object of the present invention is to provide a method for efficiently manufacturing a phosphor surface having a high-definition pattern required for a high-resolution color phosphor surface without requiring a shadow mask.

[Means for Solving the Problem] The gist of the present invention is to provide a method for manufacturing a phosphor surface used in a color cathode ray tube, in which a sinterable material in which red, green or blue phosphor or carbon is uniformly dispersed is used. A film-like material made of an organic binder composition is laminated in the order of red, carbon, green, carbon, blue, and carbon,
Cut the laminate to a predetermined thickness into thin films in the thickness direction,
The method for manufacturing a color phosphor surface is characterized in that the cut piece is adhered or crimped to a front panel for a color cathode ray tube, and then fired.

As the phosphor used in the present invention, any known phosphor can be used, but in order to obtain a high-definition stripe pattern, a phosphor with a small particle size is preferable. Specific examples of the phosphor include Y203S: ELI for red and (Zn
Examples include Cd)S: Cu, AI, and ZnS:Ag for blue, and those having a particle size of about 4 to 10 μm are used. Also, as the carbon, known carbons can be used, similar to the above-mentioned phosphor, and carbon with a fine particle size is preferable in order to obtain a high-definition stripe pattern. Specific examples of carbon include, for example, high-purity graphite, which has a particle size of about 2 to 10 μm.

The organic binder used for the film-like material in which the phosphor is dispersed is a resin with excellent sintering properties, can uniformly disperse the phosphor or carbon, and has a uniform film thickness. There is no particular limitation as long as it can obtain the following. The presence of firing residue may cause black spots when manufacturing CRTs,
This is undesirable because it causes the CRT life to be significantly shortened.

Specific examples of the organic binder include cellulose resins, vinyl alcohol resins, and methacrylic resins, among which methacrylic resins are preferred from the viewpoint of the above-mentioned scorching properties.

The above-mentioned film-like material is produced by applying a diluted organic binder in which a phosphor is dispersed in an organic solvent using a coating method such as a roll coater or a screen printing method, and then drying and removing the organic solvent. I can do it.

By the above method, a laminate as shown in FIG. 1 is obtained by sequentially laminating film materials of each color in the order of red, carbon, green, carbon, blue, and carbon, and the laminate is shown in FIG. 2. By cutting in the thickness direction, a phosphor film in which red, carbon, green, carbon, blue, and carbon are arranged in this order as shown in FIG. 3 can be obtained.

The cutting method at this time includes, for example, a method of cutting out using a microtome.

The thickness of the phosphor film is usually about 10 to 60 μm.

The obtained phosphor film is bonded or pressed to a front panel for a color cathode ray tube and then fired to obtain a color phosphor surface. As a method for adhering the phosphor film to the front panel, for example, a water-soluble adhesive such as water glass or polyvinyl alcohol may be applied onto the front panel, the phosphor film may be bonded together, dried, and fixed. In addition, as a crimping method, for example,
The phosphor film may be fixed on a glass substrate by pressing it with a rubber roller or the like so that no air bubbles remain between the substrate and the phosphor film.

In the present invention, the carbon layer is interposed between each phosphor layer to prevent color bleeding at the boundaries between red, green, and blue colors, to ensure separation of each color, and to improve the quality of images reproduced on a cathode ray tube. This is to improve contrast.

The present invention will be explained below using examples. In the examples, parts and % indicate parts by weight and % by weight, respectively.

[Example 1] 85 parts of inbutyl methacrylate, 15 parts of 2-hydroxyethyl methacrylate, and 1. azobis-7-sobutyronitrile. 5 parts were reacted in 200 parts of butyl carbitol acetate at 80°C for 10 hours.

100 parts (solid content) of the obtained acrylic resin, red, green,
Disperse and knead 430 parts of each blue phosphor (P-22) and adjust the viscosity to 12,000 CPS (25°CE type viscometer, Tokyo Keiki) using butyl carbitol acetate.
Co., Ltd.) to obtain each color phosphor paste.

In addition, high purity graphite powder UFG-S2 (manufactured by Showa Denko) 12 parts per 100 parts of the above acrylic resin (solid content)
5 parts were dispersed and kneaded, and the viscosity was adjusted to 25,000 cps (25°C) with butyl carbitol acetate to obtain a carbon paste.

Next, the red phosphor paste obtained above was printed solidly on a glass plate with a film thickness of 40μ using a #100 mesh screen plate, and dried at 80°C for 10 minutes to form a film of red phosphor. Created.

Next, carbon paste was printed on the red phosphor film with a film thickness of 10 μm using a #300 mesh screen plate to form a carbon finolem-like material. A green phosphor film, a carbon film, a blue phosphor film, and a carbon film were sequentially laminated in the same manner as the above method, and a three-color phosphor laminate (
Hereinafter, this will be referred to as 1 Tribre.

The above operation was repeated to produce a laminate of 5 triplets.

Next, the laminate was peeled off from the glass plate, divided into equal parts using a razor, and the divided pieces were adhered and laminated using terpineol to produce a 300-triplet fluorescent laminate.

The obtained laminate was cut into a thickness of 30 μm in the thickness direction using a microtome to obtain a phosphor film with 900 phosphor stripes.

The phosphor film was bonded onto a glass plate using Bobard, and then baked at 400 to 450°C to decompose unnecessary binder resin and adhesive in the paste to obtain a color phosphor surface.

When the phosphor surface was evaluated using an optical microscope, it was found that the phosphor surface had a highly accurate and uniform surface with a stripe width of one color phosphor of 30±5 μm and a carbon stripe width of 5±2 μm.

[Example 2] 99 parts of inbutyl methacrylate, 1 part of methacrylic acid, and 1.3 parts of azobisisobutylonitrile were reacted in 200 parts of 3-methoxybutyl acetate at 80°C for 10 hours.

100 parts (solid content) of the obtained acrylic resin, red, green,
Disperse and knead 450 parts of each blue phosphor (P-22), and measure the viscosity with 3-methoxybutyl acetate using IOOOOOCPS (25°CE type viscometer, Tokyo Keiki).
Co., Ltd.) to obtain each color phosphor paste.

In addition, high purity graphite powder UFG-53 (manufactured by Showa Denko) 12 per 100 parts of the above acrylic resin (solid content)
5 parts were dispersed and kneaded, and the viscosity was adjusted to 20,000 cps (25° C.) with 3-methoxybutyl acetate to obtain a carbon paste.

Next, the red phosphor paste obtained above was printed on a glass plate with a film thickness of 40μ using a #100 mesh screen plate, and dried at 80°C for 10 minutes to form a film of red phosphor. Created.

Next, carbon paste was printed all over the red phosphor film with a thickness of 10 μm using a #300 mesh screen plate to form a carbon film. A green phosphor film, a carbon film, a blue phosphor film, and a carbon film were sequentially laminated in the same manner as in the above method to produce a three-color phosphor laminate (hereinafter referred to as 1 trible soto). did.

The above operation was repeated to produce a laminate of 5 triplets.

Next, the laminate was peeled off from the glass plate, divided into equal parts using a razor, and the divided pieces were adhesively laminated using terpineol to produce a fluorescent laminate of 300 triplets.

The obtained laminate was cut into a thickness of 30 μm in the thickness direction using a microtome to obtain a phosphor film with 900 phosphor stripes.

-11- The phosphor film was adhered onto a glass plate using bovar, and then baked at 400 to 450°C to decompose unnecessary binder resin and adhesive in the paste to obtain a color phosphor surface.

When the phosphor surface was evaluated using an optical microscope, it was found that the phosphor surface had a highly accurate and uniform surface with a stripe width of one color phosphor of 30±5 μm and a carbon stripe width of 5±2 μm.

[Effects of the Invention] As detailed above, the method of the present invention makes it possible to efficiently manufacture a color phosphor surface with extremely high precision and high resolution, and to form high-definition RGB stripes. Therefore, it can be applied to small CRTs, which have been difficult to put into practical use in the past, and its industrial significance is as large as a chopstick.

[Brief explanation of drawings]

1 and 2 show a laminate of red, green, and blue phosphor films, respectively, and FIG. 2 shows how a phosphor film is cut out from the laminate. -12- Also, FIG. 3 shows a cross-sectional view of the cut out phosphor film. The symbols and numbers in the figure are as follows. A: Laminated film of phosphor and carbon film B: Phosphor film 1: Red phosphor layer 2: Green phosphor layer 3: Blue phosphor layer 4: Carbon layer 5: Microtome

Claims (1)

[Claims] In a method for manufacturing a phosphor surface used in a color cathode ray tube, a film-like material consisting of a sinterable organic binder composition in which red, green, or blue phosphors or carbon are uniformly dispersed is used to produce a phosphor surface for use in color cathode ray tubes. , blue, and carbon in this order, the laminate to a predetermined thickness is cut into thin films in the thickness direction, the cut pieces are adhered or crimped to a front panel for a color cathode ray tube, and then fired. A method for manufacturing a color phosphor surface.