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Fluorescent meterial layer with metal back, method of forming the fluorescent material layer, and image display device

A fluorescent layer and metal technology, which is applied in the direction of image/graphic display tubes, luminescent coatings, discharge tubes, etc., can solve the problems of insufficient suppression of luminous brightness, reduced brightness, and inability to achieve long-term continuous high-brightness fluorescent surfaces, etc. Achieve the effects of suppressing the decrease of luminous brightness, strong reflectivity, and low light transmittance

Inactive Publication Date: 2004-01-28
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, with the conventional metal backing layer, the decrease in luminance (film burnout) cannot be sufficiently suppressed, and since the metal backing layer absorbs a part of the electron beam, resulting in a decrease in luminance, it is impossible to realize long-term continuous high-brightness fluorescence. noodle

Method used

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  • Fluorescent meterial layer with metal back, method of forming the fluorescent material layer, and image display device
  • Fluorescent meterial layer with metal back, method of forming the fluorescent material layer, and image display device
  • Fluorescent meterial layer with metal back, method of forming the fluorescent material layer, and image display device

Examples

Experimental program
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Effect test

Embodiment 1

[0067] First, red phosphors (Y 2 o 3 S-based, average particle size about 4 μm), green phosphor (ZnS: Cu, Al-based, average particle size about 4 μm), blue phosphor (ZnS: Ag, Al-based, average particle size about 4 μm), and dry , using photolithography to form a pattern to form a fluorescent layer. A 1% solution of water glass was coated thereon and dried to form a precoat (inner coat).

[0068] Then, a transfer film formed by sequentially laminating a release agent layer, an aluminum film (film thickness 50 nm) and an adhesive on a base film (for example, a polyester resin film with a thickness of 20 μm) is placed on the above-mentioned fluorescent layer. Roller (rubber hardness 70 degrees, surface temperature 200 degrees C), with a pressing force of 500kg / cm 2 Perform heat transfer. Then, after the base film is peeled off, the organic components are removed by heating and firing at a temperature of 450°C. In this way, the panel in which the metal-backed fluorescent laye...

Embodiment 2

[0071] In the same manner as in Example 1, except that no precoat layer was formed on the fluorescent layer and the metal backing was directly transferred, a fluorescent layer with a metal backing was formed to complete the FED display device. The film thickness of the metal backing layer is 70nm, and the adhesion between the metal backing layer and the fluorescent layer is about 40%.

[0072] Then, for the FEDs obtained in Example 1 and Example 2, respectively, using the grating method, with an accelerating voltage of 10kV and a current density of 0.25μA / mm 2 The luminance reduction characteristic of the phosphor was measured. It was found that the luminance maintenance rate (relative luminance) after 10 hours of irradiation was 95% in Example 1, and the decrease in luminance was significantly suppressed. Also, in Example 2, the blue fluorescent layer exhibited a luminance maintenance rate of about 78%, and a sufficient luminance reduction improvement effect was obtained. F...

Embodiment 3

[0074] On the phosphor layer formed in the same manner as in Example 1, a metal backing layer (aluminum film) was formed by the natural varnish method. In order to make the metal backing layer easy to enter between the particles of the fluorescent layer, the thickness of the natural paint film is set to 1 / 2 (about 0.5 μm) of the usual one, and an aluminum film with a film thickness of 100 nm is formed on it by vacuum evaporation. The degree of adhesion between the obtained metal backing layer and the fluorescent layer was 70%.

[0075] Then, the FED is completed using the panel in which the fluorescent layer with the metal back is formed on the inner surface. Then, the FED was subjected to an acceleration voltage of 10 kV and a current density of 0.25 μA / mm by the grating method. 2The luminance reduction characteristic of the phosphor was measured, and it was found that the luminance maintenance rate (relative luminance) after 10 hours of irradiation was 85%, and it can be se...

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Abstract

A phosphor screen with metal back of the present invention has a degree of adhesion of 30% or more in the ratio of the contact area of a phosphor layer and a metal back layer. The deterioration (film burning) of emission brightness in FED can be suppressed and the brightness characteristics can be improved. The film thickness of the metal back layer is set to 50 to 100 nm and the light transmittance thereof is set to 10% or less to provide a highly bright display with excellent reflectivity. The phosphor screen with metal back can be formed by transferring a metal film onto the phosphor layer formed on the internal surface of a translucent substrate by using a transfer film.

Description

technical field [0001] The present invention relates to a phosphor layer with a metal back, a method for forming the same, and an image display device having a phosphor layer with a metal back. Background technique [0002] Conventionally, in a panel such as a cathode ray tube (CRT) or a field emission image display device (FED), the fluorescent layer formed on the inner surface (inner surface) of the light-transmitting panel has been deposited by vacuum deposition or the like. The method forms a metal backing layer with aluminum or the like. The effect of the metal backing layer is that, among the light emitted from the phosphor by the electrons emitted from the electron source, the light traveling toward the electron source is reflected to the panel side to improve brightness and stabilize the potential of the phosphor layer. In addition, it also has the function that the ions produced by the ionization of the remaining gas in the vacuum tube can damage the fluorescent la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/22H01J29/28H01J31/12
CPCH01J29/28H01J9/22
Inventor 田中肇中凙知子伊藤武夫
Owner KK TOSHIBA
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