JPH0467545A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a cathode-ray tube with a sufficient electrification preventing function, a good contrast, little deterioration due to light such as ultraviolet rays, a reflection preventing function, and durability by providing a required single-layer film or a multi-layer film on the surface of a faceplate. CONSTITUTION:When a single-layer film or a multi-layer film made of a conducting material, a dye or a pigment with a selected light absorbing capability, and a reflection preventing material is provided on the surface of a faceplate, a color cathode-ray tube with a sufficient electrification preventing function, a good contrast, little deterioration due to light such as ultraviolet rays, a reflection preventing function, and high durability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color cathode ray tube having a multifunctional single-layer film or multi-layer film having the effects of antistatic pressure, contrast improvement, and antireflection on the face plate surface.

[Prior Art] Conventional technologies related to this type of content include (a) using an alkali ion as a conductive material and using a hydrolyzed solution of alkylsilane to add a dye that absorbs between green and red light emission in order to increase the contrast; (b) A method of coating the surface of a cathode ray tube with a stabilized solution of a reaction product of a hydrolyzable organic silicate and an organic dye. Method for coloring cathode ray tube glass (Japanese Unexamined Patent Publication No. 63-30346), (c) antimony tin oxide (antimony tin oxide) in organic silicate solution.
A method of dispersing ultrafine particles of mony TinOxide (ATO) and adding rhodamine 6G as a coloring substance to form a colored coating film with an antistatic function on the surface of a cathode ray tube, (d) using neodymium oxide as a cathode ray tube face glass. A method of increasing contrast by interposing an organic film mixed with a substance (organic dye, etc.) that absorbs in two or more regions other than the emission spectrum of the cathode ray tube between the cathode ray tube and the viewer. Proposals such as Japanese Patent Application Laid-Open No. 59-221943) have been made.

[Problems to be Solved by the Invention] However, each of the above conventional methods has drawbacks and cannot be said to exhibit sufficiently satisfactory performance. Each problem will be briefly explained below.

First, in method (a), since alkali ions are used as the conductive substance, water in the film is lost through long-term use, resulting in a decrease in conductivity and deterioration of the antistatic function. In addition, since organic dyes are used, there is a risk of deterioration and fading due to sunlight, ultraviolet rays contained in fluorescent lamps, etc.

Furthermore, method (b) is a method of coloring the glass surface, which may interfere with the light emission of the cathode ray tube, causing a change in the emitted light color and a decrease in brightness.

In addition, the method (c) uses ultrafine particles with electronic conductivity to provide conductivity, so it is sufficient as an antistatic function, but it uses Rhodamine 6G as a coloring substance, which reduces brightness. There was a problem.

In addition, in method (d), the use of neodymium oxide-containing glass as the face glass increases costs, and the organic film is mixed with a substance that absorbs in a region other than the cathode ray tube emission spectrum, resulting in high contrast. Although organic films provide images to viewers, they have the drawback of being low in strength and lacking in durability.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, and to provide a multifunctional product that has sufficient antistatic function, good contrast, and little deterioration due to light such as ultraviolet rays, and has antireflection function. An object of the present invention is to provide a color cathode ray tube having a film.

[Means for solving the problem] The above purpose is to use antimony/tin oxide (
Antimony Tin Oxide (ATO),
Between green and red emission as a high contrast material (56
Dyes or pigments that have absorption in the wavelength range (0 to 600 nm), ultraviolet absorbers to prevent deterioration of dyes or pigments due to light such as ultraviolet rays, magnesium fluoride or silicon oxide as antireflection materials, and silicon oxide as a binder. This can be achieved by forming a multifunctional film containing on the faceplate surface.

The multifunctional film described above can obtain sufficient effects even when it is a single layer film made of the above components, but by making it a multilayer film composed of each component, UV light resistance and antireflection function can be improved. It can be further increased.

Further, such a multifunctional film can be formed by applying an alcoholic solution of an organic silicate containing the above-mentioned components by a spin coating method, a spray coating method, a dipping method, or the like.

[Operations] A method for providing an antistatic function is to provide a film made of an electronically conductive material such as ATO on the face plate surface. Examples of conductive materials include:
Some metal salts have hygroscopic properties, but since this is ionic conduction using water as a medium, the conductivity may deteriorate depending on the temperature and humidity of the atmosphere when the cathode ray tube is left unused or operated.

On the other hand, since ATO is electronically conductive, it is hardly affected by the temperature and humidity of the atmosphere, and a film made of fine ATO particles is formed on the surface of the face plate to establish electrical continuity between the film and the reinforcing metal fittings. By the switch 0 of the cathode ray tube
Static electricity generated during N-OFF can be instantly leaked to the set chassis. (Normally, the reinforcing metal fittings are grounded to the set chassis).

This prevents static electricity from building up on the face plate surface of the cathode ray tube, and also eliminates the attraction of dust due to static electricity, so you can always see a clean screen.

Additionally, one way to improve the contrast of a cathode ray tube is to form a film on the outer surface of the face plate that contains a dye or pigment that absorbs light other than the light emitted by the phosphor coated on the inner surface of the face plate. It will be done. The presence of this dye or pigment makes it possible to absorb extra light that would be included in reflected external light without lowering the brightness of the phosphor, thereby improving contrast. However, dyes and pigments generally deteriorate gradually due to ultraviolet rays, so adding an ultraviolet absorber is an effective means of preventing deterioration.

In this way, a high contrast can be guaranteed over a long period of time by the combination of dyes or pigments and UV absorbers.

In addition, as a method of providing anti-reflection function, low refractive index materials such as fine particles of magnesium fluoride and silicon oxide are used.
An example of this is to provide a film with a uniform thickness of 00 to 11000 nm on the face plate surface.

This film interferes with reflected external light in a destructive manner, resulting in an antireflection effect. This allows the user to comfortably view images and signs on the screen without feeling uncomfortable due to the reflection of external light.

As mentioned above, a single layer film containing the above components at the same time can be sufficiently effective, but it is better to use a multilayer film with UV absorbing and low refractive index materials as the outer layer to maintain high contrast for a long time and to improve the antireflection effect. It is even more effective in this respect.

[Examples] Hereinafter, the color cathode ray tube of the present invention will be specifically explained using examples.

Example 1 Figure 1 is a cross-sectional view of a color cathode ray tube with a multifunctional single layer film provided on the face plate surface.
A single layer film 3 containing dyes (sulforhodamine and methyl violet), a benzophenone ultraviolet absorber, ATO, magnesium fluoride, and silicon oxide is provided on the face plate surface 2 of the device.

The procedure for forming the single layer film 3 is as follows. That is, first, sulforhodamine 0.01-0.05%, methyl violet 0.01-0.05%, benzophenone ultraviolet absorber 0.02-0.1%, ATO fine particles 1-3%,
Prepare a solution (solution A) consisting of 0.5-2% magnesium fluoride fine particles, 1-3% ethyl silicate, 0.1-2% nitric acid, 1-5% pure water, and the balance ethanol. 29
The film was formed by spin coating on the surface 2 of the face plate of a color cathode ray tube to form a uniform film, and then heat-treated at 100 to 200° C. for 30 minutes to harden the film.

The properties of the film obtained as described above were tested and the contrast was reduced by 10 to 20% compared to the conventional technology.
The results showed that surface reflection could be reduced by about 30%. Further, the surface resistivity, which is an index indicating the antistatic effect, was 101 Ω/mouth, and the value was about 171,000 even though no antistatic treatment was applied.

Example 2 FIG. 2 is a cross-sectional view of a color cathode ray tube with a two-layer multifunctional film provided on the face plate surface.Dye (sulforhodamine and methyl violet), ATO A first layer film 4 containing silicon oxide and a second layer film 5 containing a benzophenone ultraviolet absorber, magnesium fluoride, and silicon oxide are shown.

The procedure for forming a multifunctional film consisting of two layers is as follows. That is, first, sulforhodamine 0.01-0.05%
, Methyl Violet Soto 0.01-0.05%, Acho O
Fine particles 1-3%, ethyl silicate 1-3%, hydrochloric acid 0.
A solution consisting of 1-1% pure water, 1-3% pure water, and the balance ethanol (
B liquid) and benzophenone ultraviolet absorber 0.0
A solution (solution C) consisting of 2% to 0.1% magnesium fluoride, 0.5% to 2% magnesium fluoride, 0.5% to 2% ethyl silicate, and the balance ethanol was prepared. Next, liquid B is applied onto the face plate surface 2 by a dipping method, and dried at 50° C. or lower to form a first layer film 4. Subsequently, liquid C is applied onto the film 4 by a spraying method.
The liquid was applied to form the second layer film 5, and the film was cured by heat treatment at 100 to 200° C. for 30 minutes.

The properties of the film obtained as described above were tested and the contrast was reduced by 10 to 20% compared to the conventional technology.
The results showed that surface reflection could be reduced by about 30%. Further, the surface resistance was 10''Ω/hole.

Example 3 Figure 3 is a cross-sectional view of a color cathode ray tube with a three-layer multifunctional film provided on the face plate surface. A first layer 6 containing silicon, a second layer 7 containing ATO, a benzophenone ultraviolet absorber, and silicon oxide, and a third layer 8 containing magnesium fluoride and silicon oxide. shows.

The procedure for forming a multifunctional film consisting of three layers is as follows. That is, first, sulforhodamine 0.01-0.05%
, methyl violet 0.01-0.05%, ethyl silicate 1-3%, nitric acid 0.1-1%, pure water 2-4%,
A solution consisting of the remainder ethanol (solution D) and ATO fine particles 1
~5%, benzophenone ultraviolet absorber 0.02~0°2%, ethyl silicate 1~2%, hydrochloric acid 0.1~1%,
A solution consisting of 2-4% pure water, balance ethanol (solution F), 1-4% magnesium fluoride fine particles, 1-3% ethyl silicate, 0.1-1% hydrochloric acid, 1-3% pure water, balance ethanol. A solution (F solution) consisting of the following was prepared. Next, apply liquid D on the face plate surface 2 by a spin coating method,
The first layer film 6 is formed by drying at 50° C. or lower, and then the F solution and the F solution are applied in the same manner to form the second layer film 7 and the third layer film 6.
Layer film 8 was formed, and finally heat treatment was performed at 100 to 200°C for 30 minutes to complete a multifunctional film consisting of three layers.

The properties of the film obtained as described above were tested, and results were obtained that contrast could be improved by 20% and surface reflection could be reduced by 40% compared to the case of conventional technology.
Moreover, the surface resistance was 10@Ω/mouth.

Furthermore, in the above example, the case where ethyl silicate was used as the organic silicate was explained, but this is not limited to ethyl silicate, and methyl-based or propyl-based silicates can also be used satisfactorily. . Further, although the case where the solvent of the coating liquid is mainly composed of ethanol has been described, this is not limited to ethanol, and other alcohols, esters, and ketones can also be used.

[Effects of the Invention] As described above, the color cathode ray tube is made into a color cathode ray tube having the structure of the present invention, that is, the face plate is made of a conductive material, a dye or pigment having selective light absorption ability, and an antireflection material on the surface of the face plate. By creating a color cathode ray tube with a single-layer film or a multi-layer film, the problems of conventional technology can be solved, and it has sufficient antistatic function, good contrast, and is resistant to deterioration due to light such as ultraviolet rays. We were able to provide a color cathode ray tube that is small and has a multifunctional film that also has an antireflection function.

This makes it possible to obtain clear images over a long period of time with high contrast and less reflection of external light.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a color cathode ray tube with a multifunctional single layer film on the surface of the face plate, Figure 2 is a cross sectional view of a color cathode ray tube with a two-layer multifunctional film on the face plate surface, and Figure 3 1 is a cross-sectional view of a color cathode ray tube in which a multifunctional film consisting of three layers is provided on the surface of the face plate. ■...Cathode ray tube body, 2...Face plate surface, 3...Single layer film containing dye, ultraviolet absorber, ATO, magnesium fluoride, silicon oxide, 4...Dye, ATO1 silicon oxide a first layer film comprising 5
...Second layer film containing ultraviolet absorber, magnesium fluoride, and silicon oxide, 6...First layer film containing dye, silicon oxide, 7...A
TO1 Ultraviolet absorber, second layer film containing silicon oxide, 8... Third layer film containing magnesium fluoride, silicon oxide. Figure 2 Figure 3

Claims (1)

[Claims] 1. A color cathode ray tube face plate is characterized in that a single layer or multilayer film comprising a conductive material, a dye or pigment having selective light absorption ability, an antireflection material, and silicon oxide is provided on the surface of the color cathode ray tube face plate. A color cathode ray tube. 2. The multilayer film is a multilayer film composed of a first layer film made of a conductive material, a dye, and silicon oxide, and a second layer film made of an ultraviolet absorber, magnesium fluoride, and silicon oxide. A color cathode ray tube according to claim 1, characterized in that: 3. The multilayer film includes a first layer film made of a dye and silicon oxide or a conductive material and silicon oxide, and a first layer film made of a conductive material, an ultraviolet absorber, and silicon oxide, or a dye and silicon oxide. and a third layer consisting of magnesium fluoride and silicon oxide, or magnesium fluoride, an ultraviolet absorber, and silicon oxide. A color cathode ray tube according to claim 1.