WO1991004568A1

WO1991004568A1 - Color cathode-ray tube

Info

Publication number: WO1991004568A1
Application number: PCT/JP1990/001218
Authority: WO
Inventors: Norihisa Osaka; Yukihiro Ikegami
Original assignee: Mitsubishi Rayon Co., Ltd.; Miyota Co., Ltd.
Priority date: 1989-09-22
Filing date: 1990-09-21
Publication date: 1991-04-04
Also published as: EP0445298A4; EP0445298A1; CA2042392A1; KR920702007A

Abstract

A color cathode-ray tube having at least a front panel, a funnel and an electron gun. A luminescent film is provided on the front panel. The luminescent film is produced in this manner. Red-light-emitting, green-light-emitting, and blue-light-emitting phosphor layers are repetitively laminated with nonluminescent layers interleaved. The laminate is cut along its thickness into films and baked. This makes it possible to efficiently produce a cathode-ray tube having a color luminescent screen that features very high accuracy and high resolution, and that can be adapted to small CRTs.

Description

Akira-CRT cathode ray tube technical field

The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube, which has been increasingly required recently, which is suitable for realizing high precision. It is a thing. Background art

In recent years, the type of electron gun that has been widely adopted in color cathode ray tubes is a linear arrangement of three electron guns called an in-line type. It is a thing.

In addition, the phosphor film on the panel in front of the cathode ray tube can make the brightness more efficient than the dot pattern, and the electron beam can excite each phosphor of each emission color accurately. The main strategy is to adopt a stripe that can be developed.

The strobe pattern is composed of a repeating red light-emitting phosphor film, green light-emitting phosphor film, and blue light-emitting phosphor film, and a carbon layer between the light-emitting phosphor films. It is composed of a non-light-emitting material film.

In the conventional technology, a stripe ■ pattern is formed by a slurry method, a dusting method, and a photo-adhesion method using an exposure technique. Other screens using printing technology There is a printing method. Among them, the slurry method is used as the most representative method.

In this slurry method, a liquid called a slurry in which a phosphor is dispersed in a mixture of polyvinyl alcohol and bichromate is used as a panel. Then, it is passed through an exposure mask, such as a shadow mask, to cure only the necessary parts by ultraviolet irradiation, and fix the phosphor. Unnecessary parts are washed away with warm pure water to form a phosphor film pattern. This is repeated for other light-emitting phosphors and bonbons to form a stripe-patterned phosphor film.

In the screen printing method, each luminescent color phosphor paste for printing is printed directly or indirectly on a panel, and a predetermined phosphor is fixed at a predetermined place. After that, the binder-resin component in the paste is fired to form a strip-battered phosphor film.

A cathode ray tube for power lines is manufactured by combining a panel with this phosphor film with a funnel and an electron gun.

Conventional slurry, dusting, and photo-adhesion methods all have an exposure step, but the method using this exposure technique has a fine pattern. An optical mask is indispensable, and a smaller and more precise cathode-ray tube requires a higher-precision exposure mask and technical difficulties. As a result, costs are high in terms of materials and productivity. Also, The cost of the equipment, including the II optical device, is high, and it takes time and effort to collect the phosphor, which is disadvantageous in that the loss is large.

Furthermore, in the method using the exposure technology, when exposing a thick film containing a phosphor such as a slurry solution applied to the panel surface, the phosphor is exposed to ultraviolet rays. Irregular reflection occurs, and on the entrance side of the ultraviolet light to this thick film and in the thick film, the cross-sectional area to be irradiated is wider in the latter, making it difficult to adjust the stripe width. However, the linearity is also poor, which is not good.

Screen printing methods using printing technology mainly use stainless steel screens; ^, in general, stainless steel screens. The stripe has a minimum stripe width of 0.1 mm, and is used for the purpose of realizing the miniaturization and high precision of the cathode ray tube. How can you do it? Disclosure of the invention

The present invention has been made on the basis of the above-mentioned background, and a purpose thereof is to provide a phosphor having a high-definition pattern required for high resolution. If a cathode ray tube for a power line with a membrane is not provided (f *

The gist of the present invention is at least a color cathode ray tube having a front panel, a funnel, and an electron gun.

Red light emitting phosphor layer, Green light emitting phosphor layer, Blue light emitting phosphor A fired cut piece obtained by cutting the laminate of the body layer and the non-light emitting layer into a thin film in the thickness direction is disposed on the panel.

The layer structure of the laminate is characterized in that a non-light emitting layer is interposed between the phosphor layers.

In another preferred embodiment of the present invention, a composition in which red, green, and blue phosphors and carbon are each uniformly dispersed in a sinterable organic binder. The resulting red, green, and blue phosphors and carbon layers are repeatedly laminated so that the phosphor layers sandwich the carbon layer, and have a predetermined thickness. The used laminate can be used.

In still another preferred embodiment of the present invention, a film comprising a composition in which red, blue, and blue phosphors are each uniformly dispersed in an organic binder capable of being fired. The red, blue, and blue phosphor-coated films obtained by coating and drying on the top are repeatedly laminated to form a laminate having a predetermined thickness. Wear.

In a preferred embodiment of the color cathode ray tube according to the present invention, a black stripe layer 力 and a non-light emitting layer are provided between the fired piece and the front panel. Ο is positioned opposite to

According to the present invention, since the fluorescent film is obtained from the cut piece of the laminate, the exposure step such as the conventional photo-curing method is not used, and no equipment such as an exposure apparatus is required. In addition, since expensive high-precision exposure masks are not used, fine manufacturing can be performed at a low manufacturing cost. It is possible to obtain a cathode ray tube having a fluorescent screen. To facilitate the control of the thickness of each of the stacked phosphor layers, it is necessary to use a fluorescent screen. The width of a stripe such as a phosphor stripe or a non-emission stripe can be easily controlled from a fine thickness of about 10 to a relatively large thickness. In addition, it is possible to reduce the variation of the stripe width. It is possible to obtain a cathode ray tube with a light surface.

Therefore, it is possible to efficiently manufacture a power-color phosphor surface with extremely high accuracy and high resolution, and to produce a high-resolution RGB stripe. Since it can be formed, it can be applied to small CRTs, which have been difficult to put into practical use, and its industrial significance is significant. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view, partly in section, showing an embodiment of a color cathode ray tube according to the present invention.

FIG. 2 is a schematic diagram showing a state where a phosphor layer is applied on a film in one embodiment of the present invention,

FIG. 3 (A) is a schematic view showing a state in which phosphor layers and carbon layers are alternately laminated in one of the embodiments according to the present invention.

FIG. 3 (B) is a schematic diagram showing a state where the phosphor-coated film is repeatedly laminated in one of the embodiments according to the present invention. Fig. 4 is an external view showing the appearance of cutting out the phosphor film from the laminate,

FIG. 5 is a plan view showing a state where the cut pieces are arranged on the panel.

FIG. 6 is a panel plan view showing a phosphor screen for solar cells obtained by firing the panel shown in FIG. 4,

FIG. 7 is a plan view of a panel showing a state in which a black 'stripe is formed on the panel.

FIG. 8 is a panel cross-sectional view showing a state where a cut piece is attached to a panel on which a black stripe is formed. Example

The color cathode ray tube according to the present invention has at least a front panel, a funnel and an electron gun, and a fluorescent film used as a component thereof. A fired piece obtained by cutting a laminate of the phosphor layer and the non-light-emitting layer into a thin film, which is provided on the panel.

FIG. 1 is a perspective view, partly in section, of an embodiment of a color cathode ray tube according to the present invention.

In this embodiment, a front panel 5, a panel 8, an electron gun 9, and a stripe formed on the surface of the panel 5 on the side of the electron gun 9 are shown. The phosphor film B is covered with a metal back film 6 formed by aluminum vapor deposition, and the metal back film 6 is formed. On top of the index phosphor The film 7 is formed.

The striped phosphor film B in this example has a red light-emitting phosphor layer 2, a green light-emitting phosphor layer 3, a blue light-emitting phosphor layer 4, and a non-light-emitting layer between the phosphor layers. Consists of Here, fans 8 and no. Glue 5 is glued with a flit screen 10 and an index signal take-out window 11 is provided in the fan / conne part. .

A detailed description of the phosphor film according to the present invention, that is, a fired cut piece, and an embodiment of a method for preparing a cut piece obtained by preparing a laminate and then cutting the laminate to obtain a cut piece will be given. Do.

In the first embodiment of the method for preparing a laminate, a composition in which--'blue and blue phosphors and carbon are each uniformly dispersed in a sinterable organic binder. The resulting red, blue, and blue phosphors and carbon layers are each repeatedly laminated in such a manner that the carbon layer is positioned between the phosphor layers, and There is a method of obtaining a laminate having a thickness of 1 mm.

As a specific method of laminating the phosphor and the carbon layers, a diluted organic solvent of an organic binder in which the phosphor is dispersed is mixed with a roll-copper or the like. By — Coating method ゃ Apply by screen printing, etc., remove by drying with solvent, and obtain the same result by repeating the same operation on the dried coating film. You can do this.

As a phosphor used in the preparation of a phosphor film, a known phosphor can be used in order to obtain a high-definition drive pattern. Preferably, a phosphor having a small particle size is used. Is a specific example of the phosphor of this, the red _{_{Y 2 0 2 S: E u}} , in the green (Z n C d) S: C u, A 1, a blue Z n S: A g, etc. Force; and a particle size of about 3 to 10 mm is used.

As an organic binder in which the phosphor is dispersed, a resin excellent in sintering property can uniformly disperse the phosphor or bonfire, and the like. It is not particularly limited as long as a material having a large thickness can be obtained. The presence of sintering residue is not preferred because it causes black spots and significantly shortens the CRT life when producing CRT.

Specific examples of the organic binder include, for example, a cellulose resin, a vinyl alcohol resin, and a (meth) acrylic resin. Among these, (meta) acrylic resin is preferred from the viewpoint of the above-mentioned sinterability.

As the carbon, known ones can be used in the same manner as the above-mentioned phosphors. In order to obtain a high-definition drive pattern, a carbon having a small particle size is preferred. . As a specific example of the bonbon, for example, high-purity graphite or the like can be mentioned, and a particle diameter of about 0.3 to about I 0 / is used. .

In an embodiment of the method of the first aspect of the preparation of the laminate, each phosphor layer is screen-printed at a layer thickness of 20 a and the carbon layer at a layer thickness of 1 O / z. The coating and drying were repeated to obtain a laminate. FIG. 3 (A) shows a partial outline of a laminate obtained by the above embodiment. The laminate A includes a red light-emitting phosphor layer 2, a carbon layer (non-light-emitting layer 1), a blue light-emitting phosphor layer 3, a carbon layer (non-light-emitting layer 1), and a blue light-emitting phosphor layer. 4. The layers are repeatedly laminated in the order of carbon layer (non-light emitting layer 1).

Next, this laminate is cut to a thickness of 0.02 mm in the thickness direction by using, for example, a microtome, a high-precision band saw, or the like.

In the present invention, a phosphor film having a thickness of about 10 to 60 is usually used.

Fig. 4 shows how the laminate A is cut in the thickness direction with a tom mouth to obtain a cut piece.

The obtained phosphor cut pieces have 220 triblets (three color phosphors are collectively referred to as one triblet).

In the second embodiment of preparing a laminate, a composition in which red, green, and blue phosphors are uniformly dispersed in a sinterable organic binder is applied to a film. This is dried to obtain red, blue, and blue phosphor-coated films, and the phosphor-coated films are repeatedly laminated in order to obtain a predetermined thickness. There is a mode of obtaining a laminate.

As a specific method of laminating the phosphor-coated film, a composition in which the phosphor is dispersed in an organic binder is applied by a roll coater or the like.フ Due to the screen printing method, etc. The process of coating on the film and removing the organic solvent by drying can be repeated.

FIG. 2 shows a state where the coating layer 13 of the phosphor composition is formed on the film 1.

As the film used in this embodiment, a film having good sinterability, such as a polyvinyl alcohol type or an acrylic type, is preferable. In particular, an acrylic film is preferable since it has good balance force in terms of firing properties and flexibility. The thickness of the film can be determined according to the desired layer thickness.

In addition, when using a finolem as a black stripe, carbon, graphite, etc. are evenly dispersed in the resin. It is possible to use a filmed version of

Η_ι 来

In an embodiment of the method according to the second aspect of the preparation of the laminate, each phosphor layer is layered on an acrylic film having a layer thickness of 20 a and a layer thickness of 2 Ο / ζ. Lean printing is performed, and this coating and drying are repeated to obtain a laminate.

FIG. 3 (Β) shows a partial outline of a laminate obtained by the above embodiment. This laminate Α comprises a red light-emitting phosphor layer 2, a film (non-light-emitting layer 1), a green light-emitting phosphor layer 3, a film (non-light-emitting layer 1), a blue light-emitting phosphor layer 4, The film (light-emitting layer 1) is repeatedly laminated in this order.

In preparing a fluorescent film, the obtained laminate is cut into a thin film in the thickness direction. As a cutting method at this time, for example, there is a method of cutting using a microtome, a high-precision band source, etc.0

The thickness of the phosphor film is usually about 10 to 60 /. It can be changed appropriately according to the application. In the example of the second embodiment, the sheet is cut to a thickness of 20.

Fig. 4 shows how laminate A is cut in the thickness direction with a micrometer to obtain a cut piece.

The obtained phosphor fragment has 220 triplets (three phosphors are collectively referred to as one triplet).

The obtained phosphor film is bonded or crimped to a front panel for a 35 mm × 28 mm power line, for example, a cathode ray tube.

As a method for bonding the phosphor film to the front panel, for example, a water-soluble adhesive such as water glass or poly alcohol is applied on the front panel. Then, the phosphor film may be stuck, dried and fixed. In addition, for example, a phosphor film is placed on a glass substrate by a rubber opening so that no air bubbles remain between the substrate and the phosphor film. Press and fix o

Fig. 5 shows the red light-emitting phosphor layer 2, film (non-light-emitting layer 1), green light-emitting phosphor layer 3, film (non-light-emitting layer 1), and blue light-emitting fluorescent light on panel 5. Body layer 4, film (non-light-emitting layer) The cut pieces formed in a stripe shape by repeating in the order of 1) are shown.

The cut pieces formed on the panel are fired to obtain a color phosphor surface.

Fig. 6 shows an example of the phosphor film of red phosphor 2, green phosphor 3, and blue phosphor 4 B. A color phosphor film provided on the front panel 5 for the power color cathode ray tube. FIG. In the present invention, the non-luminescent layer is interposed between the phosphor layers to prevent color bleeding at the boundary between red, green, and blue colors and to ensure separation of each color. In order to improve the contrast of the image reproduced in the Braun tube.

To prevent the contrast of the image reproduced on the Braun tube from deteriorating, as described above, by providing the non-light-emitting layer, A black stripe layer may be laminated on the phosphor film.

The method for forming the black drive layer is not particularly limited, and a known method can be used. For example, using a strip metal mask with a specific width on a substrate, a non-light-emitting and low light-transmitting material such as aluminum is formed by vapor deposition. You can do this. The preferred material in this invention is an anolymium. This is a force that can be used even with carbon and graphite-In the case of force-bon, etc., individual particles condense and the linearity of the stripe deteriorates. It is a car. In this embodiment, aluminum is used as the vapor-deposited metal, the stripe width is 20 and the film thickness is 0.05 to 0.

It is.

The plan view of FIG. 7 shows a state in which a black drive 12 is formed on the panel 5.

As a method of laminating a black stripe layer on the phosphor film, for example, a black stripe layer is formed on the front panel, and then the black stripe layer is formed. The phosphor film should be laminated on the black stripe so that the boundary between the black stripe and the red, green, and blue phosphor layers or the non-light-emitting layer would match. No.

FIG. 8 shows a state in which the phosphor film B is laminated on the panel 5 so that the non-light-emitting layer 1 and the black stripe layer 12 coincide with each other.

The panels obtained were assembled into the structure shown in Fig. 1 to produce a color cathode ray tube. The obtained color cathode ray tube had a resolution of 220 TV in a 35 mm x 25 mm panel size.

Industrial applicability

The present invention is suitable for realizing a high-density color cathode ray tube, and is suitable for a color camera of a video camera. It can be applied.

Claims

The scope of the claims

1. At least a cathode ray tube for a power line with a front panel, a funnel, and an electron gun,

A phosphor film obtained by repeatedly cutting and firing a laminate of a red light-emitting phosphor layer, a green light-emitting phosphor layer, a blue light-emitting phosphor layer, and a non-light-emitting layer into a thin film in the thickness direction is used as the panel. Are arranged on the

The layer structure of the laminate is such that a non-light emitting layer is interposed between the respective phosphor layers.

2. The laminate includes a red, blue, and blue phosphor and a carbon, each of which is composed of a composition obtained by uniformly dispersing the phosphors in a sinterable organic binder. , Blue and blue phosphors and carbon layers, and a carbon layer is interposed between the phosphor layers, and the layers are repeatedly laminated to a predetermined thickness. The color cathode ray tube according to claim 1, which is a color cathode ray tube.

3. As the laminate, a composition in which red, blue, and blue phosphors are uniformly dispersed in a sinterable organic binder is applied to a film and dried. To obtain red, green, and blue phosphor-coated films, and the phosphor-coated films are repeatedly laminated to have a predetermined thickness. A cathode ray tube for power lines according to Item 1.

4. Insert a black gap between the cut piece and the front panel. A cathode ray tube for color according to claim 1, which is disposed at a position facing the light emitting layer.