JPH04315739A - Color cathode-ray tube equipped with light selective absorption film - Google Patents

Abstract

PURPOSE:To enhance the quality and durability of a color cathode-ray tube by making the light selective absorption film of the color cathode-ray tube stable enough to avoid discoloring even if external light, especially ultraviolet rays are incident thereon. CONSTITUTION:A light selective absorption film 2 is provided by film formation process through the application of a light selective-absorption application liquid containing base paint 14, a dye 13, and at least one kind 16 selected from a nuculear acid group analogue which chemically bonds to the dye 13 to chemically stabilize the dye, cyclodextrin, flavone and deoxycholic acid. Discoloring of the light selective absorption film is thereby prevented even if ultraviolet rays are incident on the film.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube with a light selective absorption film formed on the outer surface of its face plate.

0002

[Prior Art] In recent years, as color cathode ray tubes have become larger and their brightness performance and focus performance have improved, the voltage applied to the fluorescent screen of the cathode ray tube, that is, the voltage that accelerates the electron beam, has become higher. . For example, in a conventional color cathode ray tube of the 21-inch class, the high voltage applied to the phosphor screen is 25 to 2
The voltage was about 7 kV, but in recent color cathode ray tubes of 30 inches or larger, a high voltage of 30 to 34 kV is applied to the phosphor screen. Therefore, especially when turning off the TV set's power supply,
When N-OFF, the outer surface of the color cathode ray tube's faceplate is charged up, and fine dust in the air adheres to the outer surface of the faceplate, making dirt more noticeable. As a result, the brightness performance of the color cathode ray tube deteriorates. Further, when a viewer approaches the charged-up outer surface of the face plate, an electric discharge phenomenon occurs, causing discomfort to the viewer. Figure 6 is a characteristic diagram showing the change in surface potential of the faceplate of a cathode ray tube when the power is turned on and off. This is a change curve of the surface potential when it is OFF, where the vertical axis is the surface potential (KV) and the horizontal axis is the elapsed time (sec).

In order to eliminate the above-mentioned charge-up phenomenon on the outer surface of the faceplate of a cathode ray tube,
Antistatic cathode ray tubes, which have a smooth transparent conductive film formed on the outer surface of the cathode ray tube's faceplate to allow the charge to escape to ground, have come into use in recent years. . FIG. 5 is a block diagram illustrating the principle of antistatic treatment of a conventional antistatically treated cathode ray tube. In the figure, 6 is a neck portion;
It has a built-in electron gun (not shown), 7 is a deflection yoke, 3 is a funnel part, 4 is a face plate part, 5 is a high voltage button, and the deflection yoke 7 is connected to a lead wire 7a. The electron gun is connected to a drive power source through a lead wire 6a, and the high voltage button 5 is connected to a high voltage power source through a lead wire 5a.

In the cathode ray tube configured as described above, the neck portion 6
An electron beam emitted from an electron gun built into the cathode ray tube is electromagnetically deflected from the outside of the cathode ray tube by a deflection yoke 7, and a phosphor screen provided on the inner surface of the faceplate section 4 is deflected via a high voltage button 5. Apply high pressure to. As a result, the electron beam is accelerated, and its energy excites the phosphor screen to emit light, thereby extracting optical output. As mentioned above, due to the influence of the high voltage applied to the phosphor screen on the inner surface of the face plate portion 4, the potential on the outer surface of the face plate portion 4 changes, causing problems such as adhesion of dust. . Therefore, as a countermeasure to eliminate such adverse effects, as shown in FIG. Antistatic cathode ray tubes prevent charge build-up by constantly releasing the charge to the ground. By the way, in this antistatic treated cathode ray tube, in order to ground the transparent conductive film 1 formed on the outer surface of the faceplate portion 4, as shown in FIG. A conductive tape 12 is used to establish electrical continuity between a metal explosion-proof band 8 wrapped around the side wall of the metal explosion-proof band 8 and the transparent conductive film 1. As a result, the metal explosion-proof band 8
is connected to the ground 1 by the ground wire 10 hooked on the mounting ear 9.
Since it is connected to 0A, it becomes possible to easily ground the transparent conductive film 1. Curves M and M1 in FIG. 6 are curves of the face plate of an antistatic-treated cathode ray tube in which a smooth transparent conductive film 1 is formed on the outer surface of the face plate.
Change curve of outer surface potential when the power is turned on and when the power is turned off
It shows the change curve of the outer surface potential over time, and it can be seen that the charge-up is significantly smaller than in the conventional case.

The smooth transparent conductive film 1 formed on the surface of the face plate 4 is generally made of silica, SiO2, since it is required to have a certain degree of hardness and adhesiveness. Conventionally, one of the methods for forming this silica-based smooth transparent conductive film 1 is to use -OH group, -O
After applying an alcoholic solution of Si (silicon) alkoxide having an R group etc. to the outer surface of the face plate portion 4 of the cathode ray tube uniformly and smoothly by spin coating or the like,
A method of baking at a relatively low temperature, for example, 100° C. or lower, has been used. The smooth transparent conductive film 1 formed by the above method is porous and has a silanol group ≡Si-OH, so it can adsorb moisture in the air and lower the surface resistance. Can be done. However, when such a conventional smooth transparent conductive film 1 is subjected to baking treatment at a high temperature, not only the -OH of the silanol group disappears, but also the moisture trapped in the pores disappears, so the surface resistance value decreases. As a result, the desired conductivity cannot be obtained. For this reason, low-temperature baking is essential, and the strength of the film is not very strong. Furthermore, if the porous membrane is used for a long time in a dry environment, the moisture in the porous membrane will evaporate and the surface resistance value will increase over time. Once moisture escapes from this porous structure, it is difficult for it to penetrate again. As described above, the conventional smooth transparent conductive film 1 had major drawbacks in terms of film strength and stability of resistance value over time. In addition to improving these drawbacks, attempts have been made to bond metal atoms such as Zr-zirconium to the alkoxide structure in the coating liquid to impart conductivity, but a significant improvement is not expected. I can't. Another method that can fundamentally solve these problems is, for example,
As shown in Publication No. 6403, the above Si (silicon)
In addition to mixing and dispersing fine particles of SnO2 (tin oxide) and In2O3 (indium oxide) as dielectric fillers in an alcohol solution of alkoxide, a trace amount of P (phosphorus) or Sb is added to impart semiconducting properties. Using a coating liquid containing antimony (antimony), it is coated uniformly and smoothly on the outer surface of the face plate portion 4 of the cathode ray tube by a spin coating method or the like in the same manner as in the past.
There is a method of performing baking treatment at 100°C to 200°C. With this method, it is possible to obtain a smooth transparent conductive film 1 that has strong film strength and whose resistance value does not change over time under any environment.

Conventionally, antistatic treatment for color cathode ray tubes has been carried out by such a method, but with the recent strong demand for higher picture quality in color televisions, the transparent conductive film 1 has been colored and color cathode ray tubes have been treated to prevent static electricity. Practical methods have begun to be put into practice that combine to improve tube contrast and luminescent color. That is, the coating film for obtaining the conventional transparent conductive film 1 is used as a base coating material, and an organic or inorganic dye is mixed therein to create a light-selective absorption coating liquid, which is then coated using the same conventional spin coating method. A color cathode ray tube with a light selective absorption film having an antistatic function is completed by coating the outer surface of the face plate of a color cathode ray tube. FIG. 7 is a block diagram of a color cathode ray tube 11 with an antistatically treated light selectively absorbing film 2 having an antistatically treated light selectively absorbing film 2, except for the antistatically treated light selectively absorbing film 2 shown in FIG. It is the same as a conventional cathode ray tube with antistatic treatment. FIG. 4 is a spectral diagram for explaining the optical characteristics of the antistatically treated photoselective absorption film 2, in which the horizontal axis represents wavelength (nm) and the vertical axis represents relative emission intensity and transmittance (%). In the figure, B shows the spectral distribution of the relative emission intensity of a blue-emitting sulfide phosphor on the phosphor screen of a color cathode ray tube, such as a ZnS:Ag silver-adhered zinc sulfide phosphor, which has a main spectral wavelength of about 450 nm. In addition, G is a green-emitting sulfide phosphor such as ZnS.
: Shows the spectral distribution of relative emission intensity of Au, Cu, Al (gold, copper, aluminum-adhered zinc sulfide) phosphors, and has a main spectral wavelength at about 535 nm. Similarly, R is a red-emitting rare earth phosphor such as Y2O2S:Eu(
This shows the spectral distribution of the relative emission intensity of the europium-activated yttrium sulfide phosphor, which has a main spectral wavelength at about 626 nm. B and C are color cathode ray tube phases.
This shows the spectral transmittance distribution of the face plate 4, where B shows the clear type with a spectral transmittance of about 85% in the visible light region, and C shows the spectral spectrum of the tint type face plate 4 with a spectral transmittance of about 85% in the visible light region. Shows transmittance distribution. It is clear from the relationship with the spectral distribution of the relative emission intensities of the B, G, and R phosphor screens that the lower the spectral transmittance of the faceplate 4, the worse the brightness performance of the color cathode ray tube. Since external light that enters the phosphor screen of a color cathode ray tube can be effectively removed, it is advantageous in terms of contrast function.
Spray is often used. In the figure, A is a face plate, as mentioned above, to further improve contrast performance.
An example of the spectral transmittance distribution of the conventional antistatic light selective absorption film 2 formed on the outer surface of the case 4 is shown. If the absorption peak A of the antistatic photo-selective absorption film 2 is located within the spectral wavelength range of 535 nm to 626 nm in the spectral distribution of the relative emission intensities of G and R, the color cathode ray tube is Considering the half width of this absorption band, etc., it is usually 570 nm to 61 nm, since it is disadvantageous in terms of brightness performance of the phosphor screen.
The absorption band should have a peak A in the 0 nm range. Since light with a wavelength in this range corresponds to a region where the visibility of the human eye is relatively high, it is preferable in terms of contrast performance that light in this region of the components of external light (white light) is absorbed and removed. That is, the optical properties of the antistatically treated light selectively absorbing film 2 of the conventional color cathode ray tube 11 with an antistatically treated light selectively absorbing film are high in terms of visibility for the human eye, and light can be emitted from a phosphor screen. 570nm to 610nm, which has less influence
The absorption peak A of the absorption band is placed in the nanometer range to effectively absorb external light and improve contrast performance while maintaining the luminance performance of the phosphor screen. It is very important to select organic or inorganic dyes with such optical properties.In the case of curve A, the following dyes are mixed and 5
An example is shown in which the absorption band has a peak A at 80 nm. C. as a dye in coating liquid. I. Acid Red52 (Product name:
(manufactured by Chuo Gosei Kagaku Co., Ltd.), C. I. Acid Violet
48 {Product name: Nippon Kayaku Co., Ltd.}, C. I. Bas
ic Yellow 21 (product name: manufactured by Bayer) and C.I. I. 52015 {trade name: manufactured by Wako Pure Chemical Industries, Ltd.} or C.I. I. Acid Red52 (trade name: manufactured by Chuo Gosei Kagaku Co., Ltd.), C.I. I. Acid Vio
let48 {Product name: Nippon Kayaku Co., Ltd.}, C. I.
Acid Green 28 {trade name: manufactured by Nippon Kayaku Co., Ltd.} and C.I. I. Acid Blue 7 {Product name:
A mixture manufactured by Nippon Kayaku Co., Ltd. was used. In such a color cathode ray tube 11 with an antistatic treatment type light selective absorption film, the optical light absorption characteristics of the organic and inorganic dyes mixed in the base paint are relatively broad. Of the light emitted from the phosphor screen, for example, in the case of green light emission, the chiel part on the long wavelength side of the main spectrum wavelength, and in the case of red light emission, the subpeak part on the short wavelength side of the main spectrum wavelength is absorbed by this light selective absorption film. It is also possible to improve the color tone of the emitted light at the same time.

[0007]

FIG. 8 is a sectional view of a face plate 4 of a conventional color cathode ray tube on which an antistatic treated light selective absorption film 2 is formed. This antistatic treated photoselective absorption film 2 is made of porous silica (SiO2) obtained by applying alkyl silicate as a base paint and forming a film.
The dye 13 is formed in a dispersed manner in the film 14 of the system. This dye 13 has a major problem with respect to light resistance. Particularly in the case of organic dyes, the color fading due to ultraviolet rays is extremely large. This is because dyes are normally stabilized by chemically bonding with the proteins and cellulose that make up the fibers of fabrics, but dyes are stabilized by chemical bonding with the proteins and cellulose that make up the fibers of fabrics.
When dispersed in 4, there is no partner to chemically bond with,
It is unstable because it exists alone as a particle or molecule, and
Porous silica (SiO2) in which this dye is dispersed
Since the base paint 14 of the system is in a strongly acidic state, it is easily decomposed and deteriorated by the energy of ultraviolet rays, resulting in fading of color. The reason why this porous silica (SiO2)-based film 14 exhibits strong acidity is that in order to form a stable film, the light-selective absorption coating liquid itself is strongly acidic (pH approximately 2.3) due to hydrochloric acid (HCl), etc. This is because it is adjusted to In other words, an alcoholic solution of silicon (Si) alkoxide, which is the base paint for a light-selective absorption coating liquid, is hydrated using, for example, ethyl silicate as a starting point, as shown in the chemical reaction formula 1 during the process of film formation. Through a decomposition reaction, the silanol is further transformed into a porous silica (SiO2)-based film 14 through a dehydration reaction by heating, but hydrochloric acid (HCl) is added as a catalyst to promote each of these reactions. Therefore, the coating liquid and the coating film formed therefrom exhibit strong acidity.

[0008]

[Chemical formula 1]

[0009] When watching a color TV at home, most of the time it is used indoors, so the intensity of ultraviolet rays received from the surroundings is not very strong, but if the color TV is left near a window for a long time. When installed, the dye of the antistatically treated photoselective absorption film 2 may fade due to ultraviolet rays in sunlight. FIG. 3 is a block diagram showing a method for evaluating the light resistance of such an antistatically treated photoselective absorption film 2 to ultraviolet rays. Front 30c of mercury lamp 15 for fading test
A sample with an antistatic-treated light selective absorption film 2 formed on the face plate 4 is placed at position m, and the sample is exposed to strong ultraviolet rays from a mercury lamp 15 for fading test for a certain period of time to forcibly fade the color. make me wake up Changes in the spectral transmittance distribution of the antistatic treated photoselective absorption film 2 before and after the ultraviolet exposure test are shown in A and D in FIG. In the case of the antistatic treated light selective absorption film 2 prepared by preparing the coating liquid showing the absorption peak at A in FIG. 4, the transmittance at the absorption peak A of the 580 nm absorption band was initially 70.0%. However, about 3.5mW/c
When a sample is exposed to ultraviolet rays with an intensity of m2 for about 13 hours using the test method shown in FIG. 3, the position of the absorption peak changes to A1, or 80.0%, due to fading of the dye. In the figure, A shows the spectral distribution of each antistatic treated photoselective absorption film before the ultraviolet exposure test, and D shows the spectral distribution of each antistatic treated photoselective absorption film after the ultraviolet exposure test under the previous test conditions. At this time, if ΔT and ΔT1 (%) in Figure 4 are the absorption depth, the absorption depth is 25% (ΔT) before and after the above exposure test.
This means that the temperature has changed from 15% (ΔT1) to 15% (ΔT1). Figure 2 is a characteristic diagram showing the change in absorption depth (%) with exposure time (hours), and Figure 2 shows a characteristic diagram showing the change in absorption depth (%) with exposure time (hours). This shows how the absorption depth (ΔT%) changes with exposure time when a test (3.5 mw/cm2) is conducted, and there is a significant change of 24% in 50 hours, that is, discoloration. Indicate a phenomenon. In other words, in conventional color cathode ray tubes with a light-selective absorption film, the dye dispersed in the light-selective absorption film gradually fades due to ultraviolet rays in external light, resulting in deterioration of the light-selective absorption properties and poor contrast performance. However, there was a problem that the degree of improvement in luminescence color tone was reduced.

[0010] This invention was made to solve the above-mentioned problems, and has stable external light absorption characteristics that prevent color fading due to ultraviolet rays contained in external light such as sunlight, and improves quality and quality. The object of the present invention is to provide a color cathode ray tube with a light selective absorption film that is excellent in durability, and a further object is to provide a color cathode ray tube with a light selective absorption film that can be easily obtained.

[0011]

[Means for Solving the Problems] A color cathode ray tube with a light selective absorption film according to the present invention provides a color cathode ray tube with a light selective absorption film.
A light-selective absorption film formed by applying a light-selective absorption coating liquid is provided on the outer surface of the top part, and the light-selective absorption coating liquid chemically combines with the base paint, the dye, and the dye to chemically remove the dye. It is characterized in that it contains at least one of nucleobase analogues of stabilizing substances, cyclodextrin, flavones and deoxycholic acid, and in particular, the base paint is made of a silicone resin.

0012

[Function] In the present invention, the dye in the coating liquid is chemically bonded to the photo-selective absorption coating liquid for forming the photo-selective absorption film of the color cathode ray tube with the photo-selective absorption film, and the singlet oxygen is absorbed into the coating liquid. Since a stabilizing substance is added and mixed to prevent attacks and stabilize the dye, the dye in the photo-selective absorption film that is applied and formed is extremely stable, and the dye contained in external light such as sunlight is extremely stable. Even if the dye enters the selective absorption film, fading of the dye in the film is less likely to occur.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a partially enlarged cross-sectional view of a face plate portion according to an embodiment of the present invention, in which an antistatic treatment type photo-selective absorber according to an embodiment of the present invention is formed on a face plate 4. A membrane 20 is schematically shown. In this case, a stabilizing substance 16 that chemically binds and stabilizes the dye in the coating liquid is added and mixed into the photo-selective absorption coating liquid for forming the antistatic treated photoselective absorption film 20. The dye 13 in the porous silica (SiO2)-based film 14 obtained from the base paint forming the antistatically treated photoselective absorption film 20 is used alone as in the conventional antistatically treated photoselective absorption film 2. Rather than existing as a single substance, it is chemically bonded to the stabilizing substance 16, making it an extremely stable substance. Note that the above antistatic treated photoselective absorption film uses alkyl silicate as the base paint, but the following organic polymers and silicone resins can be used as the base paint, and in that case, the stabilizing effect of the above stabilizing substance remains unchanged. This organic polymer
is an oligoester (meth) having a molecular weight of 2000 or less and having two or more (meth)acrylic groups at the molecular end.
Acrylic acid compounds such as polymethyl methacrylate are preferable because they are photocurable like silicone resins and do not require heating, making the manufacturing equipment easier. molecular weight is 20
If it exceeds 00, the film becomes too soft. Examples of such oligoester (meth)acrylic acid compounds include ethylene glycol di(meth)acrylate and triethylene glycol di(meth)acrylate, as disclosed in JP-A No. 55-10820. Acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, di Propylene glycol di(
meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)
Acrylate, butanediol di(meth)acrylate, bis[(meth)acryloxyethyl]orthophthalate
hexamethylene glycol di(meth)acrylate, bis[(meth)acryloxydiethyl] orthophthalate, bis[(meth)acryloxydipropyl] orthophthalate, bis[(meth)acryloxyethyl] Isophthalate, bis[(meth)acrylokipropyl]orthophthalate, bis[(meth)acryloxypropyl]isophthalate, bis[(meth)acryloxydiethyl]
Terephthalate, bis[(meth)acryloxyethyl]
Terephthalate, Bis[(meth)acryloxydipropyl]terephthalate, Bis[(meth)acryloxypropyl terephthalate, Bis[(meth)acryloxyethoxyphenyl]propane, Bis[(meth)acryloxy Propyloxyphenyl]propane, bis[(meth)acryloxydiethoxyphenyl]propane, bis[(meth)acryloxydipropyloxyphenyl]propane, bisphenol A di(meth)acrylate, hydrogenated bisphenol A Di(meth)acrylate, Trimethylolmethanetri(meth)acrylate, Trimethylolethanetri(meth)acrylate, Trimethylolpropanetri(meth)acrylate, Trimethylolmethanetetra(meth)acrylate, Tetramethylolethanetri(meth)acrylate )
Acrylate, Tetramethylolmethanetri(meth)acrylate, Tetramethylolpropanetri(meth)acrylate, Tetramethylolpropanetetra(meth)
Acrylate, tetramethylolmethanetetra (meth)
Acrylate, tetramethylolethanetetra(meth)
Examples include acrylate and tetramethylolmethanetetra(meth)acrylate. Furthermore, the stabilizing substances to which the dyes according to the embodiments of the present invention are chemically bonded and stabilized include nucleobase analogs such as caffeine, xanthine, hypoxanthine, theophylline, and theobromine, and β-cyclodextrin, trimethyl −β−
Examples include cyclodextrin derivatives such as cyclodextrin, dimethyl-β-cyclodextrin, and hydroxypropyl-β-cyclodextrin, deoxycholic acid, and flavones.

Example 1. As mentioned above, the curve H in FIG. 2 shows the results of the ultraviolet exposure test of the conventional antistatically treated photoselective absorption film 2 to which the stabilizing substance 16 was not added and mixed, and the absorption residual rate was 4 after 50 hours. %, that is, a fading phenomenon, whereas the curve shows a large change in the color fading phenomenon in the above-mentioned light-selective absorption coating liquid for forming the conventional antistatic treated light-selective absorption film 20. 10 by adding and mixing caffeine, a type of nucleobase, as a stabilizing substance with the dye contained at a weight ratio of 1:10.
Ultraviolet exposure test (3.5 mw/c
m2). In this case, the residual absorption rate after 50 hours was 64%, which is a significant improvement over the conventional method.

Example 2. In Example 1, dimethyl-β-cyclodextrin was used as a dye instead of caffeine.
An antistatically treated photoselective absorption film was obtained in the same manner as in Example 1, except that the mixture was mixed at a ratio of :5:5.

Example 3. 10 parts by weight of trimethyl-β-
Cyclodextrin and 1 part by weight of a water-soluble organic dye (methylene blue) are dissolved in acetone and the acetone is evaporated in a rotary evaporator. Dissolve 0.01 part by weight of azobisbutyronitrile and 1 part by weight of the above dye complex in 10 parts by weight of ethylene glycol dimethacrylate,
After applying it to a cathode ray tube, it is irradiated with light for 1 minute using a 1kW xenon lamp. The dye residual rate of this product was 70%.

Example 4. 0.1 part by weight of diazo dye {trade name: RGB-R (manufactured by Dainichiseika)} was kneaded with 100 parts by weight of silicone resin (organopolysiloxane resin) and 3 parts by weight of benzophenone sensitizer. 0.02 parts by weight of each of caffeine and dimethyl-β are mixed into the ink together with an acetone-xylene mixed solvent. Apply this mixture to a cathode ray tube to a thickness of approximately 8 μm, and
Cure by irradiating with metal halide lamp for 20 seconds. Furthermore, this material was exposed to a 1KW high pressure mercury lamp for 400 hours. The dye residual rate of this product was 70%. In addition, when the color change at this time was measured with a color difference meter, △E = 0
．． It was 72.

In these Examples, caffeine, cyclodextrin, etc. were used as the stabilizing substances, but they are not limited to these, and even with the various stabilizing substances mentioned above, the degree of effect may vary depending on the material and the amount added. It's different, but you can get the same effect. Further, as shown in the above embodiments, the stabilizing substance 16 may be added and mixed into the light selective absorption coating liquid for forming the antistatic treated light selective absorption film 20, or the dye may be mixed with the stabilizing substance 16 in advance. The same effect can be obtained by combining the light-selective absorbing coating liquid with the base coating liquid after stabilizing it by binding to the base coating liquid. The above is mainly concerned with stabilizing the light resistance to ultraviolet rays of the antistatic-treated light-selective absorption film when a dye is mixed into the transparent conductive film of the conventional antistatic-treated color cathode ray tube to give it light-selective absorption properties. However, the present invention is not limited thereto, and can be similarly applied to a color cathode ray tube with a light selective absorption film having only a light selective absorption function and no antistatic function.

[0019]

As explained above, the present invention provides a color cathode ray tube with a light selective absorption film formed by applying a light selective absorption coating liquid on the outer surface of the face plate. The selective absorption coating liquid contains a base paint, a dye, and at least one of a nucleobase analog, a cyclodextrin, a flavone, and a deoxycholic acid, which chemically binds to the dye and chemically stabilizes the dye. By using a material with these characteristics, it has stable external light absorption characteristics that prevents fading due to ultraviolet rays contained in external light such as sunlight, reduces the phenomenon of fading, and has excellent quality and durability. A color cathode ray tube with a light selective absorption film can be provided, and the color cathode ray tube with a light selective absorption film can be obtained more easily by using a silicone resin as the base paint. can be provided.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view of a face plate portion according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing changes in absorption depth (%) of a photoselective absorption film depending on exposure time (hours).

FIG. 3 is a configuration diagram showing a method for evaluating the light resistance of a photoselective absorption film to ultraviolet light.

FIG. 4 is a spectrum diagram for explaining the optical characteristics of a light selective absorption film.

FIG. 5 is a configuration diagram illustrating the principle of preventing static electricity in a conventional antistatic cathode ray tube.

FIG. 6 is a characteristic diagram showing changes in surface potential of the faceplate portion due to ON and OFF of the power supply.

FIG. 7 is a configuration diagram of a conventional color cathode ray tube with an antistatic treatment type light selective absorption film.

FIG. 8 is a partially enlarged sectional view of a conventional face plate portion.

[Explanation of symbols]

4 Face plate 13 Dye 14 Base paint 16 Stabilizing substances 20 Photoselective absorption film

Claims (2)

[Claims] 1. A color cathode ray tube in which a light selective absorption film is formed by applying a light selective absorption coating liquid to the outer surface of the face plate of the color cathode ray tube, wherein the light selective absorption coating liquid is a base paint, It is characterized by containing a dye and at least one of a nucleobase analogue, a cyclodextrin, a flavone, and a deoxycholic acid, which are stabilizing substances that chemically bind to the dye and chemically stabilize the dye. A color cathode ray tube with a light selective absorption film. 2. The color cathode ray tube with a light selective absorption film according to claim 1, wherein the base paint is a silicone resin.