JP2002197997A - DISPLAY DEVICE, ITS MANUFACTURING METHOD, FLAT TYPE CRT, ITS MANUFACTURING METHOD, AND SURFACE TREATMENT FOR DISPLAY DEVICE - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a display device which is easy to manufacture regardless of the size of the screen and has uniform brightness at the center and the outer periphery of the screen, a method of manufacturing the same, and the use thereof. An object of the present invention is to provide a flat cathode ray tube, a method for producing the same, and a surface treatment liquid for a display device. The present invention relates to a substance whose transmittance, refractive index, and surface resistance change upon irradiation of light or ultraviolet light on a substrate outer surface serving as a screen, a substance which precipitates a compound upon irradiation of light or ultraviolet light, Ag and halogen. A surface treatment film made of a substance containing a compound is formed, and in the flat-type cathode-ray tube having a phosphor, the transmittance of light at a central portion on the outer surface of the cathode-ray tube is smaller than the transmittance of light at an outer peripheral portion. Characterized in that a surface treatment film made of the above material is formed, and that the treatment solution is further used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel display device, a method for manufacturing the same, a flat-type cathode-ray tube, a method for manufacturing the same, and a surface treatment liquid for the display device.

[0002]

2. Description of the Related Art A cathode ray tube is a typical display device. Particularly recently, flat cathode ray tubes are becoming mainstream. In these cathode ray tubes, with the increase in image quality of televisions, cathode ray tubes in which various surface treatment films (antireflection film, antistatic film, etc.) are formed on the front surface of a face plate have been produced. As the surface treatment film, low resistance and low reflection are required for the anti-reflection film, and a wavelength-selective absorption film is being manufactured to improve the contrast (Japanese Patent Application Laid-Open No. 1-320742). And JP-A-4-14738).

[0003] With the widespread use of flat cathode ray tubes, the following problems have arisen when forming a surface treatment film on the CRT surface. The flat cathode ray tube has a curved structure in which the outermost surface is flat but the inner surface has a curvature. For this reason, the transmittance of the glass of the CRT panel is different between the center and the outer periphery of the panel. Generally, a difference in transmittance of about 10-20% is observed. For this reason, there has been a problem that when the light emitted from the light emitter of the CRT passes through the panel, the light emission intensity differs between the central portion and the outer peripheral portion.

Further, when a surface treatment film such as a reflection antistatic film or a wavelength selective absorption film is formed on such a flat CRT, the thickness of the film formed on the surface is uniform.
Since the transmittance of such a surface treatment film is constant at the central portion and the outer peripheral portion of the panel, when the light emitted from the CRT light emitter passes through the panel, the change in the color of the emitted light is more emphasized at the central portion and the outer peripheral portion. There was a problem.

[0005]

In order to solve the above problems, there is known a method of forming a transmittance adjusting film on the surface. In Japanese Patent Application Laid-Open No. H11-307016, films having different thicknesses are formed on a central portion and an outer peripheral portion by vacuum evaporation to correct transmittance.
JP-A-11-307018, JP-A-11-307019,
The transmittance is corrected by preparing and bonding resin plates having different thicknesses at the center and the periphery. In order to solve the above problems, it is necessary to strictly regulate the thickness of the transmittance adjusting film, but it is difficult to control the thickness.

In JP-A-11-233050, transmittance is corrected by coloring an organic resin film with cobalt oxide, nickel oxide, graphite or the like. JP Hei 10-1
Although not specifically described in JP-A-77850, a method of coloring a resin film, a method of forming a metal oxide film on a resin film, and a method of coloring an adhesive are mentioned. However, since the transmittance distribution in the film changes due to the diffusion of the coloring compound and the like, it has been difficult to control the transmittance distribution.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device which is easy to manufacture regardless of the size of the screen and has uniform brightness at the center and the outer periphery of the screen, a method of manufacturing the same, a flat cathode ray tube, a method of manufacturing the same, and a display device. To provide a surface treatment liquid for use.

[0008]

According to the present invention, there is provided a display device having a surface treatment film on an outer surface of a substrate serving as a screen, wherein the surface treatment film is formed of a substance whose transmittance or refractive index changes by light or ultraviolet rays. And a substance precipitated by irradiation with light or ultraviolet light. The display device is characterized in that the light transmittance or the refractive index of the surface treatment film is partially different, and the surface resistance is partially different. Further, the present invention is a display device, wherein the surface treatment film is formed of a film containing Ag and a halide.

Further, the surface treatment film contains SiO ₂ and a derivative thereof, a light-transmissive conductive layer is provided on the surface treatment film, and a low refractive index film of SiO ₂ is provided on the conductive layer. It is preferable to have reflection, and to prevent reflection charging.

According to the present invention, there is provided a method of manufacturing a display device in which a surface treatment film is formed on the surface of a substrate, wherein a substance which generates a compound by irradiating the surface of the substrate with light or ultraviolet light is mixed. It is a manufacturing method of.

The present invention also relates to a method of manufacturing a display device in which a surface treatment film is formed on the surface of a substrate serving as a screen, wherein a solution containing ultrafine metal particles, an alkoxysilane compound and silica sol is applied to the surface of the substrate. After drying, the screen is irradiated with the light such as ultraviolet rays while changing the irradiation intensity partially on the screen. The above-mentioned irradiation intensity is characterized by being changed by using filters having partially different transmittances. Another means for adjusting the irradiation intensity is to select a light source having a different intensity and wavelength for each portion.

The present invention also relates to a flat cathode ray tube having a phosphor, wherein a surface treatment film having a light transmittance at a central portion smaller than a light transmittance at an outer peripheral portion is formed on an outer surface of the cathode ray tube. A surface treatment film is formed on the outer surface of the cathode ray tube such that the surface resistance of the central portion is larger than the surface resistance of the outer peripheral portion.

That is, the present invention is characterized in that at least one of the transmittance, the refractive index, and the surface resistance of the surface treatment film formed on the substrate is partially changed.

Further, as a surface treatment film formed on the outer surface of the substrate, the surface treatment film contains Ag and a halide,
At least one of the transmittance, the refractive index and the surface resistance is partially changed on the screen.

[0015] The present invention also relates to the above-mentioned film containing SiO ₂ and its derivative, further comprising forming a conductive layer on the surface treatment film, and forming a low refractive index film of SiO ₂ on the conductive layer. Or a conductive film and a low-refractive-index film sequentially laminated on a surface treatment film for adjusting transmittance.

The present invention is characterized in that, after the formation of the surface treatment film, the irradiation intensity of the ultraviolet rays is changed in a gradient manner so that at least one of the transmittance, the refractive index and the surface resistance of the film is made to be gradient. The flat type cathode ray tube is manufactured by this method.

According to the present invention, there is provided a method for manufacturing a display device, comprising sequentially forming an antireflection film, an antistatic film, and a light absorbing film whose transmittance or refractive index can be changed from the outside on the outer surface of a substrate serving as a screen. In the law.

According to the present invention, there is provided a flat-type cathode-ray tube having a phosphor on an inner surface of a panel and a surface treatment film on an outer surface thereof, wherein the surface treatment film has a substance whose transmittance or refractive index changes by irradiation of light or ultraviolet light; It is formed of any of a substance that precipitates a compound by irradiation with light or ultraviolet light and a film containing Ag and a halide.

Further, according to the present invention, an antireflection film, an antistatic film, and a light absorption film whose transmittance or refractive index can be changed are sequentially formed on the outer surface of the panel from the outer surface side of the surface treatment film. The feature is the flat type cathode ray tube. The flat cathode-ray tube of the present invention is obtained by the above-described manufacturing method.

The present invention comprises a substance whose transmittance or refractive index changes upon irradiation with light or ultraviolet rays, a substance which precipitates a compound upon irradiation with light or ultraviolet rays, and a solution containing a substance containing Ag and a halide. A surface treatment liquid for a display device, characterized in that:

The surface-treated film of the present invention is a film having a property that the transmittance of the film changes and is colored by irradiation with light represented by ultraviolet rays, and the degree of coloring can be adjusted by light. . That is, by changing the intensity of light applied to the film from the central portion to the outer peripheral portion, the transmittance of the film at the central portion and the outer peripheral portion of the surface-treated film on the surface of the CRT can be inclinedly changed. It becomes possible.

This surface-treated film is characterized by containing a compound having a property of being precipitated by light irradiation. For example, this film is a film containing silver or a silver compound and halide ions in a film containing silica as a main component. These halogen sources can be introduced into the film using an alkali halide or an organic film material having silicon bonded to chloro, bromo or iodine, such as alkoxylan or a derivative thereof. Examples of the alkoxysilane compound include vinyltriethoxysilane, bromopropyltriethoxysilane, chloropropyltriethoxysilane, iodopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, β- ( 3,4-epoxycyclohexyl) ethyltrimethoxysilane.

The alkoxysilane compound is a raw material compound of an SiO ₂ derivative and is a silane coupling agent. Film formation can be performed by mixing silica sol. The ratio of the ultrafine metal particles / alkoxysilane compound / silica sol compound is preferably in the range of 1: 1: 1 to 3: 2: 1. The reason is that the raw materials as described above can be uniformly mixed, and by adjusting the concentration of the ultrafine metal particles of silver or the like to the above range, the adjustment of the amount of precipitation, that is, the adjustment of the transmittance becomes easy. Points.

When this film is irradiated with ultraviolet light, silver halide is formed in the film by the light energy of the ultraviolet light, and the film is colored. The degree of the coloring depends on the amount of silver halide formed. That is, it depends on the light intensity, irradiation time, and the like. A laser having an irradiation intensity of 5 to 36 mW / cm ² is suitable. By irradiating light of the above-mentioned intensity with a filter, the central part and the peripheral part
It is possible to change the transmittance by 30%. Since the transmittance of the film can be changed in this way, it is possible to correct the difference in the transmittance of the panel of the flat CRT.

At this time, since the film is colored and the transmittance of the film changes, the absorption coefficient of the film changes. That is, the refractive index of the film changes. In addition, since the silver ions react with the silver halide particles in the film to form insulating silver halide, the resistivity of the film also changes. By irradiating the light of the above irradiation intensity range using a filter, the difference in the refractive index of light between the central part and the peripheral part is approximately 1.4 to
1.8, it is possible to make the difference of the surface resistance value 5000 to 100,000Ω / □.

An antistatic layer (conductive film) can be formed by forming a conductive layer (ITO, ATO, Ag, Au, Pd, etc.) on the surface treatment film. By forming a low-refractive-index layer (for example, SiO ₂ or the like) on the antistatic layer, a reflective antistatic layer utilizing a light interference effect is formed.
(Low refractive index film) can be formed. By forming an antistatic film and a reflective antistatic film on a surface treatment film in which the transmittance of the film is arbitrarily controlled, the performance of the flat-panel CRT can be improved.

Further, a wavelength selective absorption film containing various organic dyes which contributes to high contrast of the film may be formed on these surface treatment films. Further, these films can be formed by a low-cost film forming method using a coating solution.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION The outer surface of a flat cathode ray tube (46 cm, panel transmittance: about 78% at the center, about 67% at the periphery, panel thickness: about 11.5 mm at the center, about 24.5 mm at the periphery) is a normal After washing by the washing method used in the sol-gel method, the temperature of the dried panel surface was adjusted to about 35 ± 1 ° C., and the following solution was applied.

Ag ultrafine particle colloidal dispersion 100 ml (3 wt%,
20 ml of a 3: 7 ethanol solution of chloropropyl trialkoxysilane and bromopropyl trialkoxysilane (2 wt%) in water-alcohol mixed solvent) was added, and then 10 ml of a silica sol solution (1 wt%) was added to form a uniform solution. . The solution was spin-coated on a flat cathode ray tube rotating at 150 rpm for 30 seconds and dried at 60 ° C. for 1 minute. Next, a quartz plate with a metal translucent filter with a transmittance distribution of 100% at the center and 0% at the periphery is installed between the film and the panel surface of the cathode ray tube with ultraviolet light of 365nm and light intensity of 20W / m2. After that, irradiation was performed for 60 seconds. As a result, the silver in the film reacts with the activated chloro and bromo to produce silver halide.

The transmittance of the formed transmittance adjuster 15 is 80% at the center of the most strongly colored portion when light is irradiated.
The difference is 91% at the peripheral portion and about 11% as compared with the central portion. This makes it possible to correct the difference in the panel transmittance of the flat CRT. When the resistance of this film was measured, the surface resistance was 12000 Ω / □ at the central portion, but was 1100 Ω / □ at the peripheral portion.

Further, a dispersion liquid (1 wt%) of Ag-Pd-Au ultrafine particle colloid was spin-coated at 45 ± 1 ° C. on the film at 150 ± 1 ° C. for 30 seconds at 150 rpm to form a conductive film 16 on the film. Formed.

Next, a SiO ₂ sol solution (0.8 wt%) was spin-coated under the same conditions. Next, this film was heat-treated at 160 ° C. for 30 minutes to form an antireflection film 17 made of a SiO ₂ film having a low refractive index. The surface treatment film having a laminated structure manufactured in this manner has a surface resistance of 850Ω / □ at the center and 56% at the periphery.
It was 0Ω / □. The luminous reflectance of this film is at the center.
It was 0.4% and 0.9% at the periphery. This surface-treated film was also extremely excellent in blocking and preventing reflection of electromagnetic waves.

FIG. 1 shows a half of a cross-sectional view of a flat-type cathode-ray tube having the above-mentioned three-layered reflective antistatic transmittance adjusting film according to the present invention.
On the outside, a transmittance adjusting film 15, a metal-based conductive film 16, and an antireflection film 17 made of a low-refractive-index SiO ₂ film are sequentially formed from the inside. As shown in the figure, an electron gun 1, an antenna getter 2, an interior graphite layer 3, an inner shield 4, a funnel 5, a frame 6, a mask 7, a panel 8, a green 9, a blue 10, and a phosphor 11 composed of red 11, black It has a matrix 12 and Al14. FIG.
2 is an enlarged view of A in FIG.

The flat type cathode-ray tube having the three-layered reflective antistatic transmittance adjusting film according to the present invention is 32
It was incorporated into an inch tube class television receiver.

According to the above-described embodiment, the difference in panel transmittance between the central portion and the outer peripheral portion can be easily achieved by the flat cathode ray tube having the surface treatment film in which the transmittance of the film is inclined by light irradiation. As a result of the correction, the brightness was uniform over the entire screen, and the image quality was extremely easy to see. In this embodiment, the light irradiation intensity is adjusted by the filter, but the same effect can be obtained by adjusting the light irradiation intensity.

Further, by forming an antistatic layer and a low-refractive-index SiO ₂ layer formed using a metal colloid on the upper layer, a high-performance antistatic anti-reflection film having low surface resistance and low surface reflection is formed. It is possible to obtain a high-performance flat cathode ray tube.

In place of the dispersion of the Ag-Pd-Au ultrafine particle colloid (1 wt%), the dispersion of the ITO ultrafine particle colloid (3 wt%) was used.
%), The same antistatic film could be produced, although the antistatic performance was inferior.

[0038]

According to the present invention, at least one of the light transmittance, the refractive index, and the surface resistance is adjusted between the central portion and the outer peripheral portion of the cathode ray tube, and the uniform luminance with a small difference in the light emission intensity over the entire screen. And a method of manufacturing the same, a flat-type cathode-ray tube using the same, a method of manufacturing the same, and a surface treatment liquid thereof.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a flat CRT having a reflective antistatic inclined absorption film having a three-layer structure manufactured.

FIG. 2 is an enlarged view of A in FIG. 1;

[Explanation of symbols]

1. Electron gun, 2. Antenna getter, 3. Interior graphite layer,
4 inner shield, 5 funnel, 5 frame, 7 mask, 8 panel, 9 green, 10 blue, 11
... red, 12 ... black matrix, 13 ... phosphor, 1
4 ... Al, 15 ... transmittance adjusting film, 16 ... conductive film, 17 ...
Anti-reflection film.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 9/20 G02B 1/10 Z (72) Inventor Masahiro Nishizawa 3300 Hayano, Mobara City, Chiba Prefecture Hitachi, Ltd. Within the Display Group of Manufacturing Works (72) Norikazu Uchiyama 3300 Hayano, Mobara City, Chiba Prefecture Within the Display Works Group of Hitachi, Ltd. Inventor Toshio Tojo 3681 Hayano Mobara-shi, Chiba F-term in Hitachi Device Engineering Co., Ltd. (reference) DD02 DE01 DE05 DF03

Claims (17)

[Claims] 1. A display device having a surface treatment film on the outer surface of a substrate serving as a screen, characterized in that the surface treatment film is formed of a substance whose transmittance or refractive index changes upon irradiation with light or ultraviolet light. Display device. 2. A display device having a surface treatment film on the outer surface of a substrate serving as a screen, wherein the surface treatment film is formed of a substance which precipitates a compound by irradiation with light or ultraviolet light. 3. A display device having a surface treatment film on an outer surface of a substrate serving as a screen, wherein the surface treatment film is formed of a film containing Ag and a halide. 4. The display device according to claim 1, wherein the light transmittance of the surface treatment film is lower at a central portion of the screen than at a peripheral portion thereof. 5. The display device according to claim 1, wherein a refractive index of said surface treatment film is larger at a central portion of said screen than at a peripheral portion thereof. 6. The display device according to claim 1, wherein the surface treatment film contains SiO ₂ and a derivative thereof. 7. The display device according to claim 1, further comprising a light-transmitting conductive layer on said surface treatment film. 8. The method according to claim 7, wherein SiO ₂ is formed on the conductive layer.
A display device characterized by having a low refractive index film. 9. A display device having a surface treatment film on the outer surface of a substrate serving as a screen, wherein the surface treatment film comprises an antireflection film, an antistatic film and a transmittance or refractive index from the outer surface side of the surface treatment film. A display device, wherein variable light absorbing films are sequentially formed. 10. A method for manufacturing a display device in which a surface treatment film is formed on an outer surface of a substrate to be a screen, wherein a solution containing ultrafine metal particles, an alkoxysilane compound and silica sol is applied onto the outer surface of the substrate and dried. And irradiating light or ultraviolet light while partially changing the irradiation intensity on the screen. 11. A method for manufacturing a display device, wherein a surface treatment film is formed on an outer surface of a substrate serving as a screen, wherein a film containing at least Ag and a halogen compound is formed on the outer surface of the substrate, and then partially formed on the screen. A method for manufacturing a display device, comprising a step of irradiating light or ultraviolet light having different intensities. 12. A method for manufacturing a display device, comprising sequentially forming a transmittance adjusting film having a variable transmittance or refractive index, an antistatic film and an antireflection film on an outer surface of a substrate to be a screen. 13. A flat-type cathode-ray tube having a phosphor on the inner surface of a panel and a surface treatment film on an outer surface thereof, wherein the surface treatment film is formed of a substance whose transmittance or refractive index is changed by irradiation of light or ultraviolet light, light or light. A flat-type cathode-ray tube characterized by being formed of one of a substance that precipitates a compound upon irradiation with ultraviolet rays and a film containing Ag and a halide. 14. A flat-type cathode-ray tube characterized in that an antireflection film, an antistatic film and a light absorption film whose transmittance or refractive index can be changed are sequentially formed on the outer surface of the panel from the outer surface side. 15. A method of manufacturing a flat CRT in which a surface treatment film is formed on an outer surface of a panel, wherein a solution containing ultrafine metal particles, an alkoxysilane compound and silica sol is applied on the outer surface of the substrate, dried, and then dried. Irradiation by partially changing the irradiation intensity of light or ultraviolet light, or after forming a film having at least Ag and a halogen compound on the outer surface of the substrate, light or ultraviolet light having a partially different intensity on the film surface. A method for manufacturing a flat-type cathode-ray tube, comprising a step of irradiating. 16. A solution comprising any of a substance whose transmittance or refractive index changes upon irradiation with light or ultraviolet rays, a substance which precipitates a compound upon irradiation with light or ultraviolet rays, and a substance containing Ag and a halide. Characteristic surface treatment liquid for display devices. 17. A television comprising the flat cathode-ray tube according to claim 13.