JPH0389429A - Manufacture of color phosphor screen - Google Patents

Abstract

PURPOSE:To efficiently manufacture a color phosphor screen by laminating filmy materials made of organic binder composition in the order of red, green and blue, cutting the laminate in the thickness direction, sticking or pressing this cut piece to a front panel, then packing it. CONSTITUTION:Film-shaped materials made of organic binder composition materials which are uniformly dispersed with red, green or blue phosphors and can be baked are laminated in the order of red, green and blue into a laminated object with the preset thickness, it is cut in the form of a thin film in the thickness direction, cut pieces are stuck or pressed to a front panel for a color cathode-ray tube, then it is baked. The organic solvent dilution of an organic binder dispersed with phosphors is coated by coating with a roll coater or screen printing, and the organic solvent is dried and removed to manufacture the filmy materials. The thickness of the phosphor film is normally set to about 10-16mum. A water-soluble adhesive such as water glass, polyvinyl alcohol, for example, is applied on the front panel, phosphor films are stuck, dried and fixed to stick phosphor films to the front panel.

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).

[Prior Art] A CRT, typified by the cathode ray tube of a television, uses an electron beam emitted from an electron gun to collide with a phosphor film surface, 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, particularly the color phosphor surface, which is the most important part for demonstrating the performance of such a CRT, generally has three colored phosphors of red, green, and blue arranged in dots or stripes. It displays light by emitting light using an electron beam, 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 firing a fixed resin component 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 component in the paste.

[Problems to be Solved by the Invention] In the conventional method of manufacturing the above-mentioned phosphor surface, the former photocuring method requires a shadow mask with a fine pattern carved therein, and as the CRT becomes smaller, the higher the resolution becomes. 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 industrially advantageous because it has lower equipment costs and less loss of phosphor than the photocuring method, but it requires direct formation on curved surfaces and high precision of 0.11 or less. This is difficult in terms of printing suitability for manufacturing small, high-resolution color phosphor surfaces that require a striped pattern, and is therefore undesirable. For this reason, this method is currently not used as an industrial manufacturing method for color phosphor surfaces when obtaining a small, high-resolution phosphor surface.

In view of this situation, an object of the present invention is to provide a method for efficiently manufacturing a phosphor surface that does not require a shadow mask and has a highly precise and fine line pattern required for a high-resolution color phosphor surface. There is.

[Means for Solving the Problems] The gist of the present invention is to provide a sinterable organic binder in which red, green or blue phosphors are uniformly dispersed in a method for manufacturing a phosphor surface used in a color cathode ray tube. A film-like material made of the composition is laminated in the order of red, green, and blue, and the laminate having a predetermined thickness is cut into thin films in the thickness direction, and the cut pieces are adhered or bonded to the front panel of a color cathode ray tube. A method of manufacturing a color phosphor surface is characterized by crimping and then baking.

As the phosphor used in the present invention, any known phosphor can be used, but in order to obtain a highly precise and highly fine line stripe pattern, a phosphor with a small particle size is preferable. Specific examples of the phosphor include Y2OaS:Eu for red and (ZnC,
d) S: Cu, AI, ZnS: Ag for blue, etc., and particles with a particle size of about 4 to 10 μm are used. The organic binder used for the film-like material in which the phosphor is dispersed is a resin with excellent sinterability, which can disperse the phosphor uniformly and obtain a film-like material with a uniform thickness. There is no particular limitation as long as it can be done. If firing residue exists, CR
When manufacturing T, it may cause sunspots or CRT
This is not desirable as it causes the 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 sinterability.

The method for manufacturing the above-mentioned film-like material is to apply an organic binder diluted with an organic solvent in which a phosphor is dispersed by a coating method using a roll coater or the like or a screen printing method, and then dry and remove the organic solvent. You can get it.

By the above method, a laminate as shown in Fig. 1 can be obtained by sequentially laminating film-like materials of each color in the order of red, green, and blue. By cutting, a phosphor film in which red, green, and blue colors 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 compressed to the 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, if the contrast of images reproduced on a cathode ray tube decreases due to color bleeding at the boundaries between red, green, and blue colors formed in the phosphor film, a black stripe layer is added to the phosphor film. It may be laminated.

The method for manufacturing the black stripe layer is not particularly limited, and any known method can be used.

For example, it can be fabricated by a vapor deposition method using a striped metal mask having a specific width on a substrate and using a non-luminous and low light transmittance material such as aluminum. An example of the substrate is a front panel.

Further, as a method for laminating a black stripe layer on a phosphor film, for example, when forming a black stripe layer on a front panel, first a black stripe layer is formed on the front panel, and then a black stripe layer is formed on the front panel. The phosphor films may be laminated so that the stripes match the boundaries of the red, green, and blue phosphor layers.

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

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

100 parts (solid content) of the obtained acrylic resin, red, green,
450 parts of each blue phosphor (P-22) was dispersed and kneaded, and the viscosity was adjusted to 100OOCPS (25°C E-type viscometer, manufactured by Tokyo Keiki Co., Ltd.) with 3-methoxybutyl acetate. each colored phosphor paste,
Solid printing was performed on a glass plate with a film thickness of 4 μm using a #100 mesh screen plate, and dried at 80°C for 10 minutes.
A film-like material of red phosphor was produced.

A green phosphor film and a blue phosphor film were sequentially laminated on a red phosphor film in the same manner as described above to produce a three-color phosphor laminate (hereinafter referred to as one tribut).

The above operation was repeated to produce a 5-triblet laminate.

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

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 adhered onto a glass plate using poval, and then baked at 400 to 450°C 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 30±5 μm for each color phosphor.

[Example 2] 90 parts of isobutyl methacrylate, 10 parts of 2-hydroxy methacrylate, and 1.5 parts of azoisobutyronitrile were reacted in butyl carpitol acetate at 80°C for 10 hours.

100 parts (solid content) of the obtained acrylic resin, red, green,
350 parts of each blue phosphor (P-22) were dispersed and kneaded, and the viscosity was adjusted to 100OOCPS (25°C E-type viscometer, manufactured by Tokyo Keiki Co., Ltd.) with butylcarpitol acetate. Each color phosphor paste,
Solid printing was performed on a glass plate with a film thickness of 50μ using a #100 mesh screen plate, and dried at 90°C for 10 minutes.
A film-like material of red phosphor was produced.

A green phosphor film and a blue phosphor film were sequentially laminated on a red phosphor film to prepare one tributet in the same manner as described above.

The above operation was repeated to produce a 5-triplet laminate.

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 fluorescent laminate of 250 tributets.

The obtained laminate was cut into a thickness of 35 μm in the thickness direction using a microtome to obtain a phosphor film with 750 phosphor stripes.

Next, a striped metal mask with a pattern width of 20 μm was mounted on the glass plate, and then aluminum was vapor-deposited to form a black stripe layer with a stripe width of 20 μm on the glass plate.

Next, on the black stripe layer of the glass plate having the black stripe layer, the phosphor film with 750 stripes was adhered with a popal so that the border of each stripe overlapped with the black stripe, and then,
It was fired at 400 to 450°C 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 20±5μ for each color phosphor between the black stripes, and a phosphor surface with black stripes between each color. there were.

[Effects of the Invention] As detailed above, by the method of the present invention, it is possible to efficiently manufacture a color phosphor surface with extremely high precision and high resolution, and moreover, it is possible to form a high-definition RGB stripe. 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 significant.

[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. Moreover, FIG. 3 shows a cross-sectional view of the cut out phosphor film. The symbols and numbers in the figure are as follows. A: Laminate of phosphor film-like materials B: Phosphor film 1: Red phosphor layer 2: Green phosphor layer 3: Blue phosphor layer 4: Microtome

Claims (1)

[Claims] In a method for manufacturing a phosphor surface used in a color cathode ray tube, film-like materials made of a sinterable organic binder composition in which red, green, or blue phosphors are uniformly dispersed are sequentially laminated in the order of red, green, and blue. A method for producing a color phosphor surface, comprising: cutting a laminate having a predetermined thickness into thin films in the thickness direction, adhering or pressing the cut pieces to a front panel for a color cathode ray tube, and then firing.