JPH0541186A - Correction method for color cathode-ray tube having antistatic processing type light selecting and absorbing film and correction method for antistatic processing type color cathode-ray tube having transparent conductive film - Google Patents

Abstract

PURPOSE:To provide a correction method of a color cathode-ray tube having an antistatic processing type light selecting and absorbing film in which relatively easy correction can be performed by applying a antistatic processing type light selecting and absorbing painting liquid or base painting liquid to a defective part of the antistatic processing type light selecting and absorbing film generated by attachment of dust, defects of the surface, etc. CONSTITUTION:By applying antistatic processing type light selecting and absorbing painting liquid or base painting liquid to a part of a defect 16 such as a color irregularity due to attachment of dust 15 or the like in an antistatic processing type light selecting and absorbing film 2 of porous silica material, normal parts and the part of the defect 16 become uniform so as to correct the part of the defect 16. When the defect is detected before baking, it can be corrected without removing the antistatic processing type light selecting and absorbing film from a face plate surface of a color cathode-ray tube by salvage as conventionally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reworking a color cathode ray tube with an antistatic treatment type photoselective absorption film provided with an antistatic treatment type photoselective absorption film formed on the surface of a face plate.

[0002]

2. Description of the Related Art In recent years, the voltage applied to the fluorescent screen of the cathode ray tube, that is, the acceleration voltage of the electron beam has been increased with the increase in size of the color cathode ray tube and the improvement in the brightness performance and the focus performance. For example, in a 21-inch class conventional color cathode ray tube, the voltage applied to the phosphor screen is 25 to 27 kV.
Although it was only about 30 to 34 kV, a voltage of 30 to 34 kV is applied to a recent color cathode ray tube of 30 type or more. Therefore, especially when the power supply of the television set is turned on and off, the outer surface of the face plate portion of the color cathode ray tube is charged up, dust in the air adheres to the outer surface of the face plate portion, and dirt easily stands out, As a result, it is a cause of deteriorating the luminance performance and the like of the color cathode ray tube.

Further, when a viewer or the like approaches the outer surface of the face plate that has been charged up, a discharge phenomenon occurs, which causes an inconvenience to give the viewer or the like an unpleasant feeling.

FIG. 6 is a graph showing changes in the surface potential of the face plate portion of the cathode ray tube when the power is turned on and off. A characteristic curve L in the drawing is a change characteristic of the surface potential when the power is turned on. L1 is a change characteristic of the surface potential when the power is off. In order to eliminate such a charge-up phenomenon on the outer surface of the face plate portion of the cathode ray tube, a smooth transparent conductive film is formed on the outer surface of the face plate to let the charge escape to the ground. Tubes have become used in recent years.

FIG. 5 is a view showing this antistatic treatment type cathode ray tube. The antistatic cathode ray tube 3 includes a face plate portion 4, a smooth transparent conductive film 1 formed on the outer surface of the face plate portion 4, a neck portion 6 containing an electron gun (not shown). , And a deflection yoke 7 disposed near the neck portion 6. The electron gun is connected to the driving power source via the lead wire 6a, and the deflection yoke 7
Is connected to the deflection power source via the lead wire 7a. Further, the cathode ray tube 3 includes a high voltage button 5, and the high voltage button 5 is connected to a high voltage power source via a lead wire 5a.

The antistatic cathode ray tube 3 has a metal explosion-proof band 8 wound around the side wall of the face plate 4, and the metal explosion-proof band 8 and the transparent conductive film 1 are electrically conductive. A conductive tape 12 is used for electrical continuity, and the metal explosion-proof band 8 is configured to be grounded to 10a via a grounding wire 10 which is hooked on a mounting ear 9.

In the cathode ray tube having the above structure, the neck portion 6
An electron beam emitted from an electron gun built into the deflection yoke 7
Is deflected electromagnetically by the high voltage button 5, and a high voltage is applied to the fluorescent surface provided on the inner surface of the face plate portion 4 to accelerate the electron beam, and the energy thereof excites the fluorescent surface to emit light to output light. Take out.

Characteristic curves M and M indicated by broken lines in FIG.
FIG. 1 is a diagram showing a potential change characteristic of the outer surface of the face plate portion when the power supply of the antistatic treatment type cathode ray tube 3 is turned on and off, and the charge-up is significantly smaller than that without the antistatic treatment. I understand.

Since the smooth transparent conductive film 1 formed on the surface of the face plate 4 is required to have a certain degree of hardness and adhesiveness that poses no practical problems, silica (SiO 2) is generally used.
₂ ) Forming a system film. As an example of a method for forming the silica-based smooth transparent conductive film 1, an alcohol solution of silicon (Si) alkoxide having a functional group such as —OH group and —OR group is applied outside the face plate portion 4 of the cathode ray tube. A method of applying a uniform and smooth coating to the surface by a spin coating method or the like and then performing a baking treatment at a relatively low temperature, for example, 100 ° C. or lower is used. The smooth transparent conductive film 1 formed by such a method is Since it is porous and has a silanol group (Si-OH), it can adsorb moisture in the air and reduce the resistance.

However, when such a conventional transparent conductive film 1 is baked at a high temperature, it has a silanol group of-.
Since the OH group disappears and the moisture taken in the porous material also disappears, the surface resistance value increases and the desired conductivity cannot be obtained.

Therefore, low temperature baking is essential and the strength of the film does not become so strong. In addition, if it is left in a dry environment for a long time, the water content in the porous body will be removed, and the surface resistance value will increase with time. do not do. As described above, the conventional transparent conductive film 1 has a large defect in terms of film strength and stability of resistance value over time.

[0012] In order to improve such a drawback, it has been attempted to impart conductivity by binding a metal atom such as zirconium (Zr) to the alkoxide structure in the coating solution.
No significant improvement could be expected.

As means for fundamentally solving these problems, fine particles of tin oxide (SnO ₂ ) or indium oxide (In ₂ O ₃ ) are mixed and dispersed in the alcohol solution of silicon alkoxide as a conductive filler. At the same time, a small amount of phosphorus (P) is added to impart semiconductor properties.
Alternatively, there is a method in which a coating liquid containing antimony (Sb) is uniformly and evenly applied on the outer surface of the face plate portion 4 of the cathode ray tube, and a baking process is performed at a relatively high temperature, for example, 100 ° C to 200 ° C. According to this method, a smooth transparent conductive film 1 which has a strong film strength and whose resistance value does not change with time under any environment can be obtained.

Conventionally, the antistatic treatment of the color cathode ray tube has been carried out by such a method, but with the recent strong demand for high image quality of the color television receiver, the transparent conductive film 1 is colored to color. A method of simultaneously improving the contrast and emission color tone of the cathode ray tube has been put into practical use. That is, a spin coating method similar to the conventional example is prepared by using the coating liquid for obtaining the conventional transparent conductive film 1 as a base material and mixing and coloring the organic or inorganic dye therein to prepare a photoselective absorption coating liquid. Etc. to form a color cathode ray tube with a photoselective absorption film having an antistatic function by applying and forming a film on the outer surface of the face plate of the color cathode ray tube.

FIG. 2 is a diagram showing the structure of the color cathode ray tube 11 with the antistatic treatment type photoselective absorption film. In the conventional antistatic treatment type shown in FIG. 5, except for the antistatic treatment type photoselective absorption film 2. It is the same as the cathode ray tube 3.

FIG. 4 is a diagram for explaining the optical characteristics of this conventional antistatic light-selective absorption film 2. A characteristic curve B in the drawing is a blue-emitting sulfide system on the fluorescent surface of the color cathode ray tube. Phosphor, for example, silver activated zinc sulfide phosphor (ZnS: Ag)
Shows a relative emission intensity spectrum distribution characteristic of about 450n
It has a main spectral wavelength at m. The characteristic curve G is
Green-emitting sulfide-based phosphors such as gold, copper, and aluminum co-activated zinc sulfide phosphors (ZnS: Au, Cu, A)
It shows the relative emission intensity spectrum distribution characteristic of 1),
It has a dominant spectral wavelength at 5 nm. Similarly, the characteristic curve R shows a red-emitting rare earth-based luminescent material, for example, a europium-activated yttrium oxysulfide phosphor (Y ₂ O ₂ S: Eu).
Shows a relative emission intensity spectrum distribution characteristic of about 626n
It has a main spectral wavelength at m.

Further, characteristic curves II and III show the spectral transmittance distribution of the face plate 4 on which the fluorescent surface of the color cathode ray tube is formed. The characteristic curve II has a spectral transmittance of about 85 in the visible light region. % Clear type, characteristic curve
III is a 50% tint type face plate 4
The spectral transmittance distributions of are shown.

The lower the spectral transmittance of the face plate 4, the more disadvantageous the fluorescent screen luminance performance of the color cathode ray tube.
This is clear from the relationship with the relative emission intensity spectrum distribution of the B, G, and R phosphors. However, external light incident on the fluorescent surface of the color cathode ray tube can be effectively removed, which is advantageous in contrast performance. For this reason, the tint type face plate 4 is often used in recent color television receivers from the viewpoint of image quality.

Further, a characteristic curve I in FIG. 4 shows an example of the spectral transmittance distribution characteristic of the antistatic light-selective absorption film 2 provided to improve the contrast performance.
If the antistatic-treated photoselective absorption film 2 absorption peak A is present in a portion near the main spectrum wavelength of 535 nm to 626 nm between the main spectrum wavelengths of the spectrum distribution of the relative emission intensity of R, the luminance performance of the color cathode ray tube. As it is disadvantageous, it is usually 570n considering the full width at half maximum of this absorption band.
The absorption peak A of the absorption band is located within the range of m to 610 nm.

This is because light having a wavelength in this range coincides with a region where human eyes have relatively high visibility, so that it is possible to absorb and remove light in this region of the external light (white light) component. This is because it is preferable in terms of contrast performance.

That is, as for the optical characteristics of the conventional antistatic treatment type light selective absorption film 2 of the conventional antistatic treatment type color cathode ray tube 11, the human eye has a relatively high luminosity factor and is radiated from the fluorescent surface. 5 has minimal effect on the luminous flux
Absorption peak A in the absorption band in the range of 70 nm to 610 nm
Is arranged so as to maintain the brightness performance of the phosphor screen and effectively absorb outside light to improve the contrast performance. It is very important to select an organic or inorganic dye having such optical characteristics, and the characteristic curve I is 58
This is an example in which the absorption peak A of the absorption band is given to 0 nm.

In such a color cathode ray tube 11 with an antistatic treatment type light selective absorption film, since the optical light absorption characteristics of the organic or inorganic dyes mixed in the base paint are relatively broad, the fluorescent screen Among the luminescence, for example, in the case of green luminescence, the tail portion on the long wavelength side of the main spectrum wavelength and in the red luminescence, the sub-peak portion of the short wavelength side of the main spectrum wavelength is absorbed by this light selective absorption film to improve the luminescent color tone. Can be done at the same time.

FIG. 3 is a sectional view of the antistatic treatment type light selective absorption film 2 thus formed on the surface of the face plate portion 4. The antistatic treatment type light selective absorption film 2 is made of porous silica. It is formed such that dye particles or molecules 13 are dispersed in a (SiO ₂ ) based film 14.

[0024]

As described above, since the contrast is improved by the antistatic light-selective absorption film 2, dust adhesion, defects, and unevenness during the manufacturing process, which are not so noticeable with the conventional transparent conductive film 1, are noticeable. Defects of the film such as the above become conspicuous, and in the antistatic treatment type light selective absorption film 2,
The probability of becoming defective increases. That is, the yield of the antistatic treatment type light selective absorption film 2 is worse than that of the conventional transparent conductive film 1, and the salvage work such as polishing for removing the defective film before baking increases. Furthermore, as salvage work increases, the number of color cathode ray tubes that will be scrapped due to damage to the surface of the face plate during salvage also increases. Because these are reflected in the manufacturing cost,
There is a problem that the cost of the color cathode ray tube with the antistatic treatment type light selective absorption film 2 becomes higher than that of the conventional color cathode ray tube with the transparent conductive film 1. Further, the conventional color cathode ray tube with the transparent conductive film 1 having a high adhesive force also has a problem that the cost becomes higher than that of the humidity-dependent type color cathode ray tube with the transparent conductive film 1. It was

The present invention has been made in order to solve the above-mentioned problems, and in the defective portion of the antistatic treatment type light selective absorption film caused by dust adhesion, surface defects and the like,
It is an object of the present invention to provide a method for reworking an antistatic treatment type color selective cathode ray tube with an antistatic treatment type light selective absorption film which can be relatively easily reworked by applying the antistatic treatment type light selective absorption coating solution or base coating solution with a brush or the like.

[0026]

A method of reworking a color cathode ray tube with an antistatic treatment-type photoselective absorption film according to the present invention is a method for repairing dust after applying an antistatic treatment-type photoselective absorption film and before firing. It is characterized in that the antistatic-treated photoselective absorption coating liquid or the base coating liquid is applied to the defective portion of the antistatic-treated photoselective absorption film caused by the adhesion of particles, surface defects, etc. with a brush or the like. It is a thing.

Further, after the antistatic treatment type transparent conductive film is applied and before firing, it is applied to the defective portion of the antistatic treatment type transparent conductive film photoselective absorption film caused by adhesion of dust or surface defects. The present invention is characterized in that the antistatic treatment type transparent conductive film coating liquid or the base coating liquid is applied.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially enlarged sectional view showing an antistatic treatment type light selective absorption film 2 formed on the outer surface of the face plate portion 4 according to the present invention.

As shown in FIG. 1, the antistatic light selective absorption film 2 is formed on the face plate portion 4 through a coating / film forming process. In the figure, 13 is a dye particle or molecule, and 14 is a porous silica-based film.

When the peripheral dust 15 adheres to the outer surface of the face plate portion 4 during the manufacturing process to cause the color unevenness defect 16, the color unevenness defect is generated before the antistatic-treated light selective absorption film 2 is baked. An antistatic-treated photoselective absorption coating liquid is applied to 16 parts with a brush or the like.

As a result, the color unevenness defect 16 portion can be repaired without damaging the face plate portion 4, and when baking is performed thereafter, a normal antistatic light-selective absorption film having substantially no color unevenness defect can be obtained. 2 is formed.

Further, the defective portion of the antistatic treatment type color cathode ray tube with the transparent conductive film which does not contain the paint having the same structure as described above is repaired by the same method.

[0034]

As described above, according to the present invention, the antistatic treatment caused by dust adhesion, surface defects, etc., after applying the antistatic treatment type light selective absorption film and before firing. Since the antistatic-treated type light selective absorption coating liquid or the base coating liquid is applied to the defective portion of the type light selective absorption film, it can be easily reworked without damaging the surface of the face plate and discarded. The number of color cathode ray tubes to be disposed of can be reduced, and thus the cost of the color cathode ray tube with the antistatic treatment type light selective absorption film can be reduced.

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view of a face plate portion of a color cathode ray tube with an antistatic treatment type light selective absorption film according to the present invention.

FIG. 2 is a side view showing a general color cathode ray tube with an antistatic treatment type light selective absorption film.

FIG. 3 is a partially enlarged sectional view of a face plate portion of a conventional antistatic color cathode ray tube.

FIG. 4 is a diagram showing the optical characteristics of an antistatic light selective absorption film.

FIG. 5 is a diagram showing the configuration of an antistatic color cathode ray tube.

FIG. 6 is a diagram showing changes in the surface potential of the face plate portion when the color cathode ray tube is powered on and off.

[Explanation of symbols]

2 Antistatic treatment type light selective absorption film 4 Face plate 11 Antistatic treatment type light selective absorption film-attached color cathode ray tube 13 Dye particles or molecules 14 Porous silica-based film 15 Dust mixed in antistatic treatment type light selective absorption film 16 Defects in color unevenness of the antistatic photoselective absorption film due to mixed dust

Claims (2)

[Claims] 1. An antistatic-treated photoselective absorption film which is formed by applying a porous silica-based antistatic-treated photoselective absorption film in which an organic or inorganic dye is dispersed on the outer surface of a face plate portion, and then firing the coated film. In the method of reworking the color cathode ray tube and the method of reworking the antistatic treatment type color cathode ray tube with a transparent conductive film, after applying the antistatic treatment type light selective absorption film and before baking, dust adhesion and surface defects A color cathode line with an antistatic treatment-type photoselective absorption film, characterized in that the antistatic treatment-type photoselective absorption film or the base coating liquid is applied to the defective portion of the antistatic treatment-type photoselective absorption film. A method for reworking a tube and an antistatic color cathode ray tube with a transparent conductive film. 2. A rework of a color cathode ray tube with an antistatic treatment type photoselective absorption film, which comprises a porous silica antistatic treatment type transparent conductive film in which an organic or inorganic dye is dispersed on the outer surface of a face plate portion. In the method and the method of reworking the antistatic color cathode ray tube with the transparent conductive film, after the antistatic transparent conductive film is applied and before baking, the antistatic caused by dust adhesion, surface defects, etc. Rework of a color cathode ray tube with an antistatic treatment type light selective absorption film, characterized in that the antistatic treatment type transparent conductive film coating liquid or base coating liquid is applied to the defective portion of the treatment type transparent conductive film light selective absorption film. Method and reworking method for antistatic color cathode ray tube with transparent conductive film.