JPH06103931A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a cathode-ray tube which has a high contrast and a high visibility to satisfy the various demands by customers. CONSTITUTION:In a cathode-ray tube made by providing an envelope consisting of a panel 10, a funnel 20, and a neck 30, a colored transparent conductive membrane 80 which has an organic paint such as SiO2, ZnO, and TiO2 as the component material is formed on the outer surface of the panel 10, over which a reflection preventive membrane is formed as necessary. As a result, a high contrast property can be obtained by the colored transparent conductive membrane which has a light wavelength selecting absorption property. And by providing the reflection preventive membrane, a non-glare property can be given.

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 in particular, a cathode ray tube having a structure having functions of preventing reflection of external light on the image display surface and enhancing contrast, and preventing surface charging due to electrostatic induction. Regarding

[0002]

2. Description of the Related Art In a cathode ray tube known as CPT or CDT, 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.
The cathode ray tube proposed in the above-mentioned JP-A-3-11532 contains an organic dye, at least one selected from tin oxide, indium oxide and antimony oxide, which are themselves conductive, and ethyl silicate. By providing a colored transparent conductive film formed by coating and baking an alcohol solution, light wavelength selective absorption performance can be imparted and the image contrast can be improved. Further, when the colored transparent conductive film is formed on the outer surface of the panel, the surface becomes a mirror surface and reflects external light, making it difficult to see an image. Therefore, in order to prevent reflection, it is necessary to make this colored transparent conductive film uneven by spray coating, or to form another layer of antireflection film on the formed colored transparent conductive film.

Depending on the kind of organic dye constituting the colored transparent conductive film, there is a property that fading or discoloration occurs with respect to ultraviolet rays or sunlight, and the necessary coloring property must be sacrificed to some extent. There were cases where it did not happen. Also,
Depending on the customer's preference, the cathode ray tube may have a glossy outer surface, a glossy one, or an antireflection film.

When manufacturing a cathode ray tube satisfying all of these requirements at the same time, first, a cathode ray tube coated with a colored transparent conductive film having gloss is prepared, and then, if necessary. It is important to achieve simplification of the manufacturing process by forming a non-glossy antireflection film or a glossy antireflection film. The purpose of the present invention is to
An object of the present invention is to provide a cathode ray tube having a structure capable of flexibly coping with customer's requirements such as antistatic performance, high contrast imparted with selective absorption performance, and presence / absence of glossiness and presence / absence of antireflection property.

[0011]

In order to achieve the above object, the present invention provides a cathode ray tube having an outer envelope composed of a panel 10, a funnel 20 and a neck 30, wherein the outer surface of the panel 10 is made of SiO ₂ , It is characterized in that a colored transparent conductive film 80 containing at least one kind selected from ZnO and TiO ₂ as an essential component is provided.

Further, according to the present invention, a colored transparent conductive film 10 containing at least one selected from SiO ₂ , ZnO and TiO ₂ as an essential component is provided on the outer surface of the panel 10, and the colored transparent conductive film is also provided. 10, SiO ₂ , Z
An antireflection film 90 containing at least one component selected from nO and TiO ₂ is provided. Furthermore, the present invention provides that, on the outer surface of the panel 10, SnO ₂ ,
At least 1 selected from Sb ₂ O ₃ and In ₂ O ₃
A colored transparent conductive film 80 formed by applying and baking an alcohol solution containing a type and ethyl silicate is provided.

Further, according to the present invention, the above-mentioned SiO ₂ , Zn containing alcohol as a main solvent is formed on the outer surface of the panel 10.
The antireflection film 90 is characterized by being provided by applying and baking a solution containing an alkoxide of at least one component selected from O and TiO ₂ . An organic dye, particularly a rhodamine-based organic dye, is added to the liquid of the transparent conductive film in order to have a light wavelength selective absorption performance. Further, the light resistance greatly changes depending on the type and structure of the organic dye in the liquid used as the colored transparent conductive film. In order to stabilize this, the role of storing the organic dye from ultraviolet rays is SiO
_At least one selected from ₂ , ZnO and TiO ₂ is contained in the coating liquid as an essential component.

Further, at least one kind selected from SiO ₂ , ZnO and TiO ₂ is contained as an essential component in the antireflection film forming solution for the same reason as above. Next, as a method to make the image easier to see by making it so-called non-glare to eliminate glossiness, and to make the image easier to see, the diffused reflection can be used by making the colored transparent conductive film itself uneven by spray coating, etc. There is also a method of applying a non-glare antireflection film, a so-called non-glare film, by spraying one more layer on the colored transparent conductive film having the coating. However, with this method, two types of devices (for example, a spin coating device and a spray coating device) must be prepared as devices for forming the colored transparent conductive film, which increases equipment costs and the number of steps.

Therefore, in order to meet the above requirement of non-glare, a colored transparent conductive film of glare is first formed, and then a non-glare antireflection film is formed by spraying. To meet the requirement for an antiglare film for glare, first, a colored transparent conductive film for glare is formed, and then a thin glare antireflection film for spray coating is formed thereon, or an antiglare antireflection film for spin coating is formed. To form. Since this glare antireflection film can be colorless and the same kind can be used, it is sufficient to prepare an apparatus having both a spinner function and a spray function in one booth. Therefore, the process is not complicated.

[0016]

The high contrast is due to the selective absorption of organic dyes, especially rhodamine dyes. That is, FIG. 4 is an explanatory diagram of the emission spectrum of the phosphor of the color cathode ray tube, in which the horizontal axis shows the wavelength (nm) and the vertical axis shows the emission intensity (relative%).

In the figure, the wavelengths between the peak wavelengths of the blue, green, and blue emission spectra are unnecessary wavelengths that impair the sharpness of color, and are indicated by diagonal lines.
By cutting off the light of the unnecessary wavelength shown by the shaded area, it is possible to achieve high contrast and improvement of sharpness. Therefore, an organic dye is added to the alcohol solution to form a colored transparent conductive film having a light wavelength selective absorption performance, and the filter effect of selectively absorbing light of the unnecessary wavelength is retained.

FIG. 5 is an explanatory view of the selective absorption ability of the colored transparent conductive 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. Although SiO ₂ has no ability to absorb ultraviolet rays, it is considered that SiO ₂ has a function of protecting against ultraviolet rays by surrounding the organic dye with a predetermined thickness.

FIG. 6 is an explanatory view of the ultraviolet ray absorbing ability of ZnO and TiO ₂ , in which the horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (%). From the characteristics of the figure, wavelength 400n
It can be seen that ultraviolet rays of m or less are completely absorbed and cut. Organic dyes that have light resistance are ZnO and TiO.
_Although the addition of ₂ is unnecessary, if it is necessary to further improve the light resistance, ZnO, TiO ₂
The object can be achieved by adding the component (1), and wrapping the organic dye around it to protect it from ultraviolet rays.

Regarding the antistatic performance, SnO ₂ , Sb ₂ O ₃ and In ₂ O, which themselves have electronic conductivity, are used.
Ingredients containing at least one selected from the group ₃ are evenly and densely connected to each other to exhibit stable transparent conductivity and have good antistatic performance.

[0021]

Embodiments of the cathode ray tube of the present invention will be described below 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 cross-sectional view of the entire structure of the cathode ray tube, (b) is (a)
It is a principal part sectional view which expands and shows the A section.

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 transparent conductive 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 red electron beams, respectively.

As shown in the enlarged view of FIG. 2B, the colored transparent conductive film 80 formed on the outer surface of the panel 10 and capable of selectively absorbing light has a filter effect of selectively absorbing light of the unnecessary wavelength. It has an antistatic effect.
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. An outer deflection yoke, 80 is a colored transparent conductive film similar to that in the above embodiment, and 90 is an antireflection film.

As shown in an enlarged view in FIG. 2B, a colored transparent conductive film 80 having a light wavelength selective absorption property formed on the outer surface of the panel 10 has a filter effect of selectively absorbing light of the unnecessary wavelength. In addition to having an antistatic effect, an antireflection film 90 formed by laminating on the colored transparent conductive film 80 has an antireflection effect. Although not shown, the colored transparent conductive film 80 and the antireflection film 90 shown in FIGS. 1 and 2 may be provided with ultraviolet absorbing particles as a constituent material in order to impart light resistance (sunlight resistance). It is possible to prevent deterioration of characteristics due to changes.

As described above, according to the above-described embodiment of the present invention, it is possible to provide a cathode ray tube which has a high contrast image due to antireflection due to the selective absorption of external light, a good antistatic effect, and a non-glare effect. The above-mentioned sunlight resistance means the number of days until the initial transmittance drop of the colored antireflection film is 100% and it is exposed to sunlight (external light) to decrease the transmittance to 50%. It is represented by.

Next, a method for manufacturing the cathode ray tube according to the present invention will be described. First, the front surface of the panel 10 of the cathode ray tube is cleaned with an abrasive such as cerium oxide (CeO ₂ ) and an alkaline detergent such as siliron (Henkel-trade name-manufactured by Hakusui Co., Ltd.). Then SnO ₂ + Sb ₂ O ₃ ,
A mixed solution was prepared by adding an organic dye to a solution consisting of ethyl silicate, a mixed solvent, water and a catalyst, and the mixed solution was uniformly applied on the front surface of the panel 10 using a spinner, and then the temperature was adjusted to 150 ° C. The colored transparent conductive film 80 was formed by baking at a temperature for 30 minutes. Here, the application with the spinner was performed under the conditions of a solution dropping amount of 10 ml, a spinner rotation speed of 100 rpm, and a time of 1 minute.

In place of or in combination with the above-mentioned ethyl silicate, ZnO alkoxide such as Zinc-Di-n-butoxide can be used in order to improve the light resistance of the organic dye.
e _{[Zn (O-n-C 4} H 9) 2 ], of the TiO ₂ alkoxide include titanium tetraisopropoxide [T
_{i (O-C 3 H 7} ) 4 ] no problem even using. Further, in order to further improve the light resistance of the organic dye, fine particles of SiO ₂ , ZnO, and TiO ₂ may be added in combination with the ethyl silicate.

Many organic dyes can be used as the organic dye used in the present invention. That is, azo dyes, anthraquinone dyes, indigoid dyes, phthalocyanine dyes, carbonium ion dyes, and other dyes may be selected according to the purpose such as the shape and color of the coloring matter, and the present invention is not limited to the use of such dyes. . The amount of dye used in the coloring solution is difficult to exhibit a fixed amount. In practice, a dye amount which is not too high can give a sufficiently satisfactory coloration.

Light shades are used in connection with ethyl silicate by using lesser amounts of the dye,
Alternatively, it can be achieved by lowering the concentration of the reaction product in the solution. Further, dyes may be combined to obtain various colors or shades. Next, an example of forming a non-glare antireflection film on the colored transparent conductive film according to the customer's request will be described.

First, a solution having exactly the same composition is prepared except that the organic dye and SnO ₂ + Sb ₂ O ₃ are removed from the solution for forming the colored transparent conductive film, and the amount of ethyl silicate is slightly increased. This solution is applied by spray coating on the colored transparent conductive film 80 shown in FIG. 1 to form a non-glare antireflection film 90 (FIG. 2).
reference).

FIG. 3 is an explanatory view showing various specific examples of the constitution of the colored transparent conductive film and the 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 provided for comparison, and the color tone is colorless, and the effect of improving the contrast is not observed. Concrete examples 2 to 4 are examples in which the type of the organic dye is changed, but the effects are seen in contrast and sharpness.

Example 5 uses a mixture of organic dyes, and the contrast and sharpness are very good. In addition, in Concrete Example 6, in order to satisfy both the improvement of the light resistance of the organic dye and the requirements of the customer, an antireflection film was spray coated, and the light resistance was improved without deteriorating the image quality such as contrast and sharpness. It is improved four times and the regular reflectance is reduced by 2.5%.

Concrete examples 7 and 8 are examples in which only the colored transparent conductive film is deposited, and ZnO is used to improve the light resistance of the organic dye.
This is an example of adding the component of. It can be seen that the addition of this ZnO component makes the light resistance very good. Specific examples 9, 10 and 11 are examples in which a colored transparent conductive film and an antireflection film are formed on the colored transparent conductive film.
It can be seen that the light resistance is further improved because it contains _two components.

Specific example 12 is the same as the specific example 1 except that the conductive material in the colored transparent conductive film is In ₂ O ₃ + SnO.
It is a concrete example having a content similar to that of No. 11 and having a lower surface resistance, and is a VLEF (Very Low Electr).
The surface-treated film satisfies the ic field) standard. It should be noted that, in any of the specific examples shown in FIG. 3, the decay time of charging is 300 seconds or longer for untreated ones, but 1 kV or less instantaneously as described as 1 second or less. become. The charge decay time mentioned here is the time required for the electrostatic charge charged on the outer surface of the panel to be 1 kV or less when the switch of the image receiver is turned on.

[0036]

As described above, according to the present invention, a cathode ray tube having a colored transparent conductive film and / or an antireflection film on the outer surface of the panel of the cathode ray tube is provided.
By solving the problems of the prior art, it is possible to easily and inexpensively provide a cathode ray tube having high contrast, excellent sharpness, light resistance, and excellent antistatic effect and external light antireflection effect. It can be provided.

[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 showing various specific examples of the configuration of a colored transparent conductive film and an antireflection film according to the present invention and the characteristics of a cathode ray tube to which the same is applied.

FIG. 4 is an explanatory diagram of an emission spectrum of a phosphor of a color cathode ray tube.

FIG. 5 is an explanatory view of selective absorption ability of a colored transparent conductive film having a light wavelength selective absorption performance.

FIG. 6 is an explanatory diagram of ultraviolet absorbing performance of ZnO and TiO ₂ .

[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 80 mounted on the connection area between the funnel and the neck 80 colored transparent conductive film 90 reflection Preventive film.

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[Procedure amendment]

[Submission date] October 7, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

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

Claims (4)

[Claims] 1. A cathode ray tube having an outer envelope composed of a panel, a funnel and a neck, and a colored transparent conductive film having an essential component of at least one selected from SiO ₂ , ZnO and TiO _{2 on} the outer surface of the panel. A cathode ray tube characterized by being provided with. 2. A cathode ray tube having a peripheral device comprising a panel, a funnel and a neck, wherein the outer surface of the panel is a colored transparent conductive film containing at least one selected from SiO ₂ , ZnO and TiO ₂ as an essential component. And the colored transparent conductive film is provided with SiO ₂ , ZnO, T
A cathode ray tube provided with an antireflection film containing at least one component selected from iO ₂ . 3. The colored transparent conductive film according to claim 1, wherein the colored transparent conductive film is an organic dye and SnO having conductivity itself.
A cathode ray tube comprising a colored transparent conductive film formed by applying and baking an alcohol solution containing at least one selected from ₂ , Sb ₂ O ₃ and In ₂ O ₃ and ethyl silicate. 4. The antireflection film according to claim 2, wherein a solution containing an alkoxide of at least one component selected from SiO ₂ , ZnO and TiO ₂ containing alcohol as a main solvent is applied and baked on the antireflection film. A cathode ray tube, which is a formed antireflection film.