JPH06103930A - Cathode-ray tube and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a cathode-ray tube in which a reflection preventive property and a high contrast property can be obtained satisfactorily, a charge preventive property is given, the light-proof property (sun-proof property) of the light wavelength selecting absorption film for a high contrast is improved, and sufficient CONSTITUTION:In a cathode-ray tube made by providing an envelope which consists of a panel 10, a funnel 20, and a neck 30, a colored reflection preventive membrane 80 having a light wavelength selecting absorption property which has an organic paint as the component material; and a transparent conductive membrane 90; are provided on the outer surface of the above panel 10. By such a constitution, a cathode-ray tube and its manufacturing method which can prevent the reflection of the external light, has an excellent high contrast and an excellent visibility, and furthermore, has the charge preventive effect, can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube and a method for manufacturing the same, and particularly has a structure that avoids reflection of external light on the image display surface, high contrast, and prevention of surface electrification by electrostatic induction. The present invention relates to a cathode ray tube and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a cathode ray tube known as CDT or CPT, a panel surface (outer surface), which is an image display surface, is generally in a glossy state, so that it is easy to reflect outside light, and an image displayed on the panel surface is easily reflected. Is difficult to read. In particular, recently, a display device having a cathode ray tube is widely used as a terminal of information equipment in addition to a television receiver, and it is taken as a problem of the working environment of an operator. There is a strong demand.

At the same time, with the popularization of so-called reinforced cathode ray tubes, no protective glass is required on the panel surface of the cathode ray tube, and the panel is exposed directly to the outside air. However, there is also a problem that the user is shocked and the user is shocked, or dust in the atmosphere is adsorbed to reduce the visibility of the display image. As measures for solving the above problems, various proposals have been made in which an antireflection film or a transparent conductive film is attached to the outer surface of the panel.

An antireflection film of this type is disclosed in Japanese Patent Laid-Open No. 63-
In the cathode ray tube disclosed in Japanese Patent No. 193101, an alcohol solution of Si (OR) ₄ (R is an alkyl group) to which fine particles of silicon oxide (SiO ₂ ) are added is applied and baked on the surface of a glass body forming a panel. However, it has an antireflection film that has fine and uniform irregularities on the surface and utilizes the interference of light due to the continuous change of the refractive index.

However, the above antireflection film does not have selective absorption performance (optical wavelength selective absorption performance) for the optical spectrum, and is not particularly effective for improving the contrast. Further, in the cathode ray tube disclosed in JP-A-1-154445, a transparent conductive film is formed on the antireflection film so as to have both antireflection performance and antistatic performance.

However, even this transparent conductive film does not have the selective absorption performance as in the above case, and has no great effect on the contrast improvement. Further, JP-A-63-30346 discloses a method of forming a colored film from a solution containing an organic dye and ethyl silicate on a glass surface constituting a panel of a cathode ray tube.

A cathode ray tube having a high contrast image is formed by forming a colored transparent conductive film containing an organic dye in a transparent conductive film which is an antistatic film based on the above method for forming a colored film. It is disclosed in Japanese Patent Laid-Open No. 3-11532.

[0008]

As described above, the cathode ray tube of recent years is required to have multi-functionality, and one of them is antireflection performance and high contrast, and further,
There is a demand for a cathode ray tube that possesses all of the antistatic performance.
With the above-mentioned conventional techniques, it is difficult to provide a cathode ray tube that satisfies all of these requirements, particularly a cathode ray tube that has both antireflection and high contrast.

It is an object of the present invention to provide a cathode ray tube having a novel structure which simultaneously satisfies antireflection performance and high contrast and has antistatic performance, and a method for manufacturing the same. Another object of the present invention is to improve the light resistance (sunlight resistance) of the light wavelength selective absorption film for increasing the contrast, and to provide a cathode ray tube which can be used practically and sufficiently.

[0010]

Means for Solving the Problems The antireflection performance is
₂ fine particles of ethyl silicate, zinc butoxide,
At least one alcohol solution selected from alkoxides such as titanium tetra-iso-propoxide is applied to the outer surface of the panel, and if necessary, it is baked to form uniform fine irregularities of SiO _2. It is obtained by forming on the outer surface of the panel.

At this time, Si decomposed from the alkoxide
O ₂ , ZnO, TiO _{2 and the} like act as a binder to fix the fine particles of SiO ₂ crystals. Next, the high contrast of the cathode ray tube can be obtained by further adding an organic dye to the above solution. As this organic dye, an organic dye capable of forming a film having a selective absorption performance that cuts off light having a wavelength between the peak wavelengths of the respective emission spectra of the three color phosphors of the cathode ray tube is selected.

The organic dye has different light resistance (coloring life) depending on its type and structure, but generally has the property of fading or discoloring with respect to ultraviolet rays or sunlight. In order to prevent this, zinc or titanium alkoxide (complex salt) or fine particles that absorb ultraviolet rays are added to the above solution. Furthermore, in addition to antireflection and high contrast, the demand for imparting antistatic performance is addressed as follows.

That is, at least one selected from tin oxide, indium oxide, and antimony oxide, which themselves have conductivity, ethyl silicate, Zn
At least one selected from alkoxides of O and TiO ₂ is an essential component, and if necessary, Zn
Antistatic performance can be imparted by a transparent conductive film formed by applying and baking an alcohol solution containing at least one kind of fine particles of O and TiO _{2 on} the base or the upper layer of the colored antireflection film. it can. Alternatively, both the colored antireflection film and the transparent conductive film may be applied and baked in the same layer.

That is, the cathode ray tube according to the present invention is a cathode ray tube having an envelope composed of a panel 10, a funnel 20 and a neck 30, and a light wavelength selection using an organic dye as a constituent material on the outer surface of the panel 10. It is characterized in that a colored antireflection film 80 having absorption performance is provided. In addition, the cathode ray tube according to the present invention is a cathode ray tube having an envelope composed of the panel 10, the funnel 20 and the neck 30, and has an optical wavelength selective absorption performance using an organic dye as a constituent material on the outer surface of the panel 10. Colored antireflection film 8 having
0 and the transparent conductive film 90 are laminated and provided.

Furthermore, the cathode ray tube according to the present invention is characterized in that the colored antireflection film has ultraviolet absorbing particles as a constituent material. A method of manufacturing a cathode ray tube according to the present invention is a method of manufacturing a cathode ray tube having an envelope including a panel 10, a funnel 20 and a neck 30, wherein the outer surface of the panel 10 is made of silicon, zinc or titanium. At least one kind of alcohol solution selected from each alkoxide is applied with a solution prepared by mixing an organic dye and fine particles of SiO ₂ so that the outer surface of the panel has a light wavelength selective absorption performance with the organic dye as a constituent material. It is characterized in that it includes at least a step of forming the colored antireflection film 80.

Further, the method of manufacturing a cathode ray tube according to the present invention includes a panel 10, a funnel 20 and a neck 30.
A method of manufacturing a cathode ray tube having an envelope made of, a step of forming a colored antireflection film 80 having an optical wavelength selective absorption performance, which comprises an organic dye as a constituent material, on the outer surface of the panel 10, A mixed solution of at least one selected from tin oxide, indium oxide, and antimony oxide, which themselves have conductivity, and at least one alcohol solution selected from alkoxides of silicon, zinc, and titanium. To form a transparent conductive film 90 by coating the above-mentioned colored antireflection film 80 on the underlayer, the upper layer, or both the upper layer and the underlying layer, or forming both the colored antireflection layer and the transparent conductive film in the same layer. It is characterized by including at least a step of forming a film.

Furthermore, in the method for manufacturing a cathode ray tube according to the present invention, in order to improve the light resistance of the organic dye, in each of the manufacturing methods, fine particles of zinc and titanium are contained in the mixed alcohol solution. It is characterized in that at least one kind of fine particles selected from the above is added.

[0018]

The antireflection property is that SiO ₂ , ZnO, and TiO ₂ formed by hydrolysis of alkoxide serve as a binder to fix the uniformly dispersed particles of SiO ₂ to form irregularities on the outer surface of the panel. This is achieved by utilizing the interference absorption function of light by the continuously changing layer of refractive index produced by the above. The details of this principle are described in the above-mentioned Japanese Patent Laid-Open No. 63-193101, so the description thereof will be omitted here.

The high contrast performance is achieved by the selective absorption of the organic dye, which will be described below with reference to the drawings. That is, FIG. 3 is an explanatory diagram of the emission spectrum of the phosphor of the color cathode ray tube, in which the horizontal axis represents wavelength (nm) and the vertical axis represents emission intensity (relative%). In the figure,
Wavelengths between the peak wavelengths of the blue, green, and blue emission spectra are unnecessary wavelengths of light that impair the vividness of the color, and are indicated by diagonal lines.

By cutting off the light of the unnecessary wavelength shown by the shaded portion, it is possible to achieve a high contrast and an improved sharpness. Therefore, an organic dye is added to the alcohol solution to form a colored antireflection film having a light wavelength selective absorption performance, and the filter effect of selectively absorbing light of the unnecessary wavelength is retained.

FIG. 4 is an explanatory view of the selective absorption ability of the colored antireflection film, in which the horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (%). Incidentally, in order to improve the light resistance of the organic dye, the ultraviolet absorbing ability of ZnO and TiO ₂ is utilized. FIG. 5 is an explanatory diagram of the ultraviolet absorbing ability of ZnO and TiO ₂ , in which the horizontal axis shows the wavelength of 8 nm) and the vertical axis shows the transmittance (%).

From the characteristics shown in the figure, it can be seen that ultraviolet rays having a wavelength of 400 nm or less are completely absorbed and cut. If the organic dye itself has light resistance, it is not necessary to add ZnO or TiO ₂ , but if it is necessary to further improve the light resistance, the components of ZnO and TiO ₂ may be added to the organic dye so that The purpose can be achieved by wrapping and protecting from ultraviolet rays.

Regarding antistatic performance, SnO ₂ , In ₂ O ₃ and S, which have electronic conductivity by themselves, are used.
The components containing at least one selected from b ₂ O ₃ are evenly and densely linked to each other to exhibit stable transparent conductivity and have good antistatic performance.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view for explaining the structure of one embodiment of a cathode ray tube according to the present invention, (a) is a sectional view of the entire structure of the cathode ray tube, and (b) is an enlarged view of portion A of (a). It is a principal part sectional view shown.

In FIG. 1A, 10 is a panel and 20 is a panel.
Is a funnel, 30 is a neck, 40 is an electron gun housed inside the neck 30, 50 is a shadow mask, 60 is a phosphor layer formed on the inner surface of the panel 10, and 70 is a connecting region between the funnel 20 and the neck 30. The outer deflection yoke 80 is a colored antireflection film. In addition, panel 10,
The funnel 20 and the neck 30 constitute a cathode ray tube envelope, and B, G, and R represent blue, green, and blue electron beams, respectively.

As shown in the enlarged view of FIG. 2B, the colored antireflection film 80 having the light wavelength selective absorption property formed on the outer surface of the panel 10 has a filter effect of selectively absorbing the light of the unnecessary wavelength. I have it. 2A and 2B are sectional views for explaining the structure of another embodiment of the cathode ray tube according to the present invention. FIG. 2A is a sectional view of the entire structure of the cathode ray tube, and FIG. 2B is an enlarged view of portion B of FIG. FIG.

In FIG. 1A, 10 is a panel and 20 is a panel.
Is a funnel, 30 is a neck, 40 is an electron gun housed inside the neck 30, 50 is a shadow mask, 60 is a phosphor layer formed on the inner surface of the panel 10, and 70 is a connecting region between the funnel 20 and the neck 30. The deflection yoke 80 which is packaged has a colored antireflection film similar to that of the above-mentioned embodiment.
Reference numeral 0 is a transparent conductive film.

As shown in the enlarged view of FIG. 2B, the colored antireflection film 80 having the light wavelength selective absorption property formed on the outer surface of the panel 10 has a filter effect of selectively absorbing the light of the unnecessary wavelength. In addition to having the anti-static effect, the transparent conductive film 90 laminated on the colored anti-reflection film 80 has an anti-static effect. Although not shown,
In order to impart light resistance (sun resistance) to the colored antireflection film 80 shown in FIGS. 1 and 2 described above, ultraviolet absorbing particles are included as a constituent material to prevent deterioration of the filter effect due to aging. it can.

As described above, according to the above-mentioned embodiment of the present invention, it is possible to provide a cathode ray tube having antireflection, high contrast and good antistatic effect. It should be noted that the above-mentioned sunlight resistance means that the initial transmittance drop of the colored antireflection film is 100%.
Is the number of days until it is exposed to sunlight (external light) and the transmittance decreases to 50%.

Next, an embodiment of the method of manufacturing a cathode ray tube according to the present invention will be described. The solution for forming a colored antireflection film having a light wavelength selective absorption property used for manufacturing the cathode ray tube according to the present invention is prepared, for example, as follows. First,
An alcohol solution of ethyl silicate is prepared by dissolving Si (OR) ₄ (R represents an alkyl group) in ethanol. To this solution, SiO ₂ fine particles having an average particle diameter of 10 to 500 nm are added in the range of 0.1 to 10 wt%.

In order to impart the performance as a film-forming agent or a binder to this ethyl silicate, a small amount of H ₂ O is added to the above alcohol solution and reacted in the presence of a catalyst to obtain its properties. The alcohol is mainly ethanol and isopropyl alcohol. By adding an acid such as nitric acid or hydrochloric acid as the catalyst, the reaction is gradually promoted, and the addition of this acid also serves as a stabilizer for the silica sol.

In order to improve the light resistance of the organic dye described below, instead of ethyl silicate or in combination therewith, an alkoxide such as Zinc-Di-n-butoxy is used.
de _{[Zn (O-n-C 4} H 9) 2 ], of the TiO ₂ alkoxide, for example no problem even using titanium tetraisopropoxide _{[Ti (O-C 3 H 7} ) 4 ].

Further, in order to further improve the light resistance of the organic dye, fine particles of ZnO and TiO ₂ may be added together with the fine particles of SiO ₂ . Next, an organic dye is added to these mixed alcohol solutions for coloring. Many organic dyes can be used as the organic dye used in this embodiment. That is, azo dyes, anthraquinone dyes, indigoid dyes, phthalocyanine dyes, carbonium ion dyes, and other dyes may be selected depending on the shape of the colored product, the color, and the like. Not limited.

The amount of dye used in the coloring solution is difficult to exhibit a fixed amount. In fact, it was possible to give a sufficiently satisfactory coloration with dyes which were not too high. Lighter shades can be achieved in the context of ethyl silicate by using lesser amounts of dye or by lowering the concentration of reaction products in solution. Further, dyes may be combined to obtain various colors or shades.

The thus prepared solution for forming a colored antireflection film having a light wavelength selective absorption performance is at room temperature or 6%.
It is applied to the outer surface of the panel glass under heating at 0 ° C or lower.
This application can be carried out by spraying, dipping, spin-coating or any convenient method which can be used for uniform coating. The reaction product of the organic silicate and the organic dye is presumed to have a certain chelate structure. Further, it is considered that the bond to the glass is strongly adhered by the Si-O-Si bond and Si-OH. After applying this solution on the surface of the panel glass, the coated surface is cured at 100 ° C to 2 in order to cure the coating film.
It is desirable to heat at 00 ° C.

FIG. 6 is an explanatory view showing various specific examples of the constitution of the colored antireflection film having the light wavelength selective absorption performance according to the present invention and the characteristics of the cathode ray tube to which the same is applied. In the figure, the specific example 1 is an example other than the present invention, which is given for comparison, and the color tone is colorless, and no effect is observed. Specific example 2
No. 4 is an example in which the type of organic dye is changed, but the effect can be seen in contrast and sharpness.

Concrete examples 5 to 8 use a mixture of organic dyes, and the contrast and sharpness are very good. Further, specific examples 7 to 8 are examples in which fine particles of ZnO and TiO ₂ were added in order to improve the light resistance of the organic dye. By adding the fine particles of ZnO and TiO ₂ ,
It can be seen that the light resistance is very good.

Next, the characteristics of the cathode ray tube in which the transparent conductive film is formed on the colored antireflection film will be described. FIG. 7 is an explanatory view showing various specific examples of the characteristics of the cathode ray tube in which the transparent conductive film is formed on the colored antireflection film having the light wavelength selective absorption property according to the present invention. The transparent conductive film formed on the colored antireflection film having the light wavelength selective absorption performance is prepared by using a transparent conductive film forming solution using (SnO ₂ + Sb ₂ O ₃ ) as a conductive substance. Apply exactly the same coating method as the film, 100 ° C-200 ° C
It was baked for about 30 minutes. The characteristics of the two-layer film of the colored antireflection film and the transparent conductive film thus formed are shown in FIG.

When the switch of the receiver is turned on, the panel of the cathode ray tube is charged, and the time until it becomes 0 KV is shown as the * charge decay time in the figure. This static decay time is measured at a position 50 mm away from the center of the face surface of the panel.
"H" is installed, the temperature is 20 to 23 ° C, and the relative humidity is 30 to 3
The measurement was performed under an environmental condition of 5%.

The surface potential of an untreated cathode ray tube panel is about 1.
The surface potential of the cathode ray tube panel according to the embodiment of the present invention is 2 seconds or less after 1 second or less as shown in Examples 9, 10 and 11 of FIG. It is 1 KV or less, and it can be seen that it has a good antistatic effect. When the specific example 2 and the specific example 9 are compared and the example 8 and the examples 10 and 11 are compared, respectively, the reflectance is 0.2.
%, But the color tone, contrast, sharpness, etc. do not change at all, and the sun resistance is improved by the antistatic film.

Although the present embodiment has shown the constitutional example in which the transparent conductive film is provided on the upper layer and the colored antireflection film is provided on the lower layer, the transparent conductive film is provided on the lower layer and the colored reflective film is provided on the upper layer according to the gist of the present invention. It does not matter whether the anti-reflection film is provided or the transparent conductive film and the anti-reflection film are formed in the same layer (spray coating simultaneously or simultaneously spray coating). further,
Both the transparent conductive film and the antireflection film may be colored, or only the transparent conductive film may be colored.

[0042]

As described above, according to the present invention,
By using a colored antireflection film having a light wavelength selective absorption property on the outer surface of the panel, or a cathode ray tube provided with the colored antireflection film and a transparent conductive film, reflection of external light is prevented and high contrast and vividness are obtained. It is possible to easily and inexpensively provide a cathode ray tube having excellent antistatic effect.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating the structure of an embodiment of a cathode ray tube according to the present invention, (a) is a sectional view of the entire structure of the cathode ray tube, and (b) is an enlarged view of portion A of (a). FIG.

2A and 2B are sectional views illustrating the structure of another embodiment of the cathode ray tube according to the present invention, FIG. 2A is a sectional view of the entire structure of the cathode ray tube, and FIG. 2B is an enlarged view of portion B of FIG. 2A. FIG.

FIG. 3 is an explanatory diagram of an emission spectrum of a phosphor of a color cathode ray tube.

FIG. 4 is an explanatory diagram of selective absorption ability of a colored antireflection film having a light wavelength selective absorption performance.

FIG. 5 is an explanatory diagram of ultraviolet absorption performance of ZnO and TiO ₂ .

FIG. 6 is an explanatory diagram showing various specific examples of the constitution of a colored antireflection film having a light wavelength selective absorption property according to the present invention and the characteristics of a cathode ray tube to which the same is applied.

FIG. 7 is an explanatory diagram showing various specific examples of the characteristics of a cathode ray tube in which a transparent conductive film is formed on the top of a colored antireflection film having a light wavelength selective absorption property according to the present invention.

[Explanation of symbols]

10 panel 20 funnel 30 neck 40 electron gun housed inside the neck 50 shadow mask 60 phosphor layer formed on the inner surface of the panel 70 deflection yoke mounted on the connecting area of the funnel and neck 80 light wavelength selective absorption performance Colored antireflection film having 90 A transparent conductive film.

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[Procedure amendment]

[Submission date] October 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

That is, oxidation having conductivity itself.
At least one selected from tin , indium oxide, and antimony oxide, ethyl silicate, Zn
At least one selected from alkoxides of O and TiO ₂ is an essential component, and if necessary, Zn
Antistatic performance can be imparted by a transparent conductive film formed by applying and baking an alcohol solution containing at least one kind of fine particles of O and TiO _{2 on} the base or the upper layer of the colored antireflection film. it can. There
Apply both a colored antireflection film and a transparent conductive film in the same layer.
Obtained by cloth and firing.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Further, the method of manufacturing a cathode ray tube according to the present invention includes a panel 10, a funnel 20 and a neck 30.
A method of manufacturing a cathode ray tube having an envelope made of, a step of forming a colored antireflection film 80 having an optical wavelength selective absorption performance, which comprises an organic dye as a constituent material, on the outer surface of the panel 10, A mixed solution of at least one selected from tin oxide, indium oxide, and antimony oxide, which themselves have conductivity, and at least one alcohol solution selected from alkoxides of silicon, zinc, and titanium. To at least form a transparent conductive film 90 by applying the above to the base or the top of the colored antireflection film 80, or to form both the colored antireflection film and the transparent conductive film in the same layer. Is characterized by.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshifumi Tomita 3300 Hayano, Mobara-shi, Chiba Hitachi Ltd. Mobara factory

Claims (3)

[Claims] 1. A cathode ray tube having an envelope composed of a panel, a funnel and a neck, wherein a colored antireflection film having an optical wavelength selective absorption performance, which comprises an organic dye as a constituent material, is provided on the outer surface of the panel. A cathode ray tube characterized by that. 2. A method of manufacturing a cathode ray tube having an envelope composed of a panel, a funnel and a neck, wherein at least one selected from silicon, zinc and titanium alkoxides is formed on the outer surface of the panel. Applying a mixed solution of organic dye and fine particles of silicon oxide to an alcohol solution of a different type to form a colored antireflection film having an optical wavelength selective absorption property on the outer surface of the panel, the organic dye being a constituent material. A method of manufacturing a cathode ray tube comprising at least: 3. A method of manufacturing a cathode ray tube having an envelope composed of a panel, a funnel and a neck, wherein a colored antireflection having an optical wavelength selective absorption property with an organic dye as a constituent material on the outer surface of the panel. The step of forming a film, at least one selected from tin oxide, indium oxide, and antimony oxide, which themselves have conductivity, and at least one selected from the alkoxides of silicon, zinc, and titanium. A step of applying a mixed solution of one kind of alcohol solution to the base or top of the colored antireflection film having the above-mentioned light wavelength selective absorption performance to form a transparent conductive film or to the colored antireflection film and the transparent layer in the same layer. A method of manufacturing a cathode ray tube comprising at least a step of forming both of the conductive films.