JP2001210234A - Method for fabricating fluorescent screen and color cathode ray tube using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain method of fabricating a fluorescent screen by which fluorescent material stripe is well cut without color mixing and separation of a fluorescent material. SOLUTION: Resist stripe pattern 21 is formed on a glass substrate 1 Fig. 1 (a)}, a light absorbing layer 3 Fig. 1 (b)} is formed and a water repellent layer 4 Fig. 1 (c)} is formed thereon. Thereafter, the resist stripe pattern 21 is removed, and the light absorbing layer 3 and the water repellent layer 4 are separated to form black stripes 6 Fig. 1 (d)}. And then, a fluorescent slurry is applied on the substrate only between the black stripes 6 Fig. 1 (e)}, and a blue color fluorescent material stripe 5b Fig. 1 (f)}, a red color fluorescent material stripe 5r and a green color fluorescent material stripe 5g Fig. 1 (g)} are formed by exposing and developing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a phosphor screen and a color cathode ray tube using the same.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view showing a method of manufacturing a phosphor screen of a conventional color cathode ray tube in the order of steps.
1 is a substrate such as glass called a face panel,
2 is a resist film, 21 is a resist stripe pattern, 3 is a light absorbing layer, 15b is a blue phosphor film, 5b, 5
r and 5g are blue, red and green phosphor stripes, respectively, and 61 is a black stripe.

First, the surface of a glass substrate 1 called a face panel is cleaned with a neutral detergent or the like. Thereafter, a photosensitive resist solution such as a polyvinyl alcohol solution containing potassium dichromate is applied by spin coating to form a film having a uniform thickness, and dried to form a resist film 2 {FIG.
(A)｝. Next, a slit-shaped member made of metal called a shadow mask is attached to the face panel, and the shadow mask is used as an exposure mask to expose the positions where the red, blue, and green phosphor stripes are to be formed. The exposed portion of the resist film becomes insoluble in water. When the unexposed resist film is removed by washing with shower-like water, a resist stripe pattern 21 is formed.
(B)｝.

Next, on the stripe pattern 21,
For example, a carbon-containing solution containing fine particles of carbon graphite is applied by spin coating to form a film having a uniform thickness,
The light absorbing layer 3 is formed by drying (FIG. 2C). Next, a resist stripe pattern 21 insoluble in water remaining on the glass substrate 1 with an etching solution containing a hydrogen peroxide solution is used.
Is removed, and the light absorbing layer 3 applied thereon is peeled off to form a black stripe 61 {FIG.
(D)｝. The black stripe 61 thus formed is a black light absorbing layer, and has an effect of absorbing light from the surroundings incident on the display surface and improving the contrast of a displayed image.

Further, a photosensitive water-soluble solution such as a polyvinyl alcohol solution containing potassium bichromate containing a phosphor called a phosphor slurry using a blue phosphor is applied by spin coating to form a film having a uniform thickness. And dried to form a blue phosphor film 15b (FIG. 2e). The position of the blue stripe is exposed using the shadow mask as an exposure mask.
The exposed portion of the blue phosphor film becomes insoluble in water. Thereafter, the portions other than the blue stripes are removed by washing with shower-like water (development) to form blue stripes 5b {FIG. 2 (f)}. Next, a red stripe 5r and a green stripe 5g are formed through the same steps as those for forming the blue stripe to complete the phosphor stripes of three colors {FIG. 2 (g)}.

[0006] When a phosphor stripe is manufactured in the above-described steps, the light intensity and light spread at the time of exposure affect the quality of the phosphor stripe. If the light intensity is low, the photocuring of the phosphor film is insufficient when the phosphor film is exposed, and the phosphor is washed away when washed with shower water, and the stripes fall off. Conversely, if the light intensity is too high, the pattern of the light that has passed through the shadow mask spreads, exposing the phosphor film on the black stripe to make the stripe thicker, and the red, blue, and green phosphors are mixed.

For this reason, Japanese Patent Application Laid-Open No. 1-248426 discloses that a black stripe is formed as the light absorbing layer 3 in FIG. 2 by using a water-repellent material mixed with a carbon-containing solution. . This is because the phosphor slurry flows between the black stripes, but the phosphor slurry does not cover the black stripes.

[0008]

However, the use of a photosensitive layer mixed with a water-repellent material as described above has the effect of preventing the phosphor from mixing on the black stripe, but has the following effects. There were challenges.

FIG. 3 is an explanatory view for explaining the states of the black stripe and the phosphor stripe on the phosphor screen according to the conventional method for producing a phosphor screen. Reference numeral 13 denotes a normal state, and reference numerals 11 and 12 denote a state in which a defect has occurred. . That is, (1) If the carbon-containing solution itself constituting the light-absorbing layer has water repellency, the carbon-containing solution is repelled by the glass substrate. When a film is formed, the problem of repelling becomes significant. As a result, as shown in FIG. 3, when the carbon-containing solution is dried, the cross section becomes semicircular due to the surface tension of the solution, and the black stripe after drying becomes thinner. (2) When the phosphor slurry is injected after the formation of the black stripe, the phosphor slurry is repelled from the side of the stripe due to the water repellency on the side of the black matrix, so that a gap is formed between the black stripe and the phosphor stripe. 12 results. (3) When silicon or the like is mixed into the carbon-containing solution to impart water repellency, there is also a problem that the black stripe becomes whitish and the light absorbency decreases.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a method for manufacturing a phosphor screen in which the phosphor stripes are prevented from being mixed or dropped, and the phosphor stripes are sharply cut. It is another object of the present invention to obtain a color cathode ray tube having excellent in-plane uniformity.

[0011]

According to the first aspect of the present invention, there is provided a method for forming a phosphor screen, comprising: forming a resist stripe pattern on a substrate; forming a light absorbing layer on the resist stripe pattern; Forming a water repellent layer on the light absorbing layer, removing the stripe pattern and the light absorbing layer and the water repellent layer formed on the stripe pattern to form a black stripe; In this method, a body film is formed and developed to form a phosphor stripe between the black stripes.

[0012] The second method for manufacturing a phosphor screen according to the present invention comprises:
In the first method for producing a fluorescent screen, the water-repellent layer contains fine silicon dioxide particles.

A first color cathode ray tube according to the present invention is a black stripe comprising a light absorbing layer provided on the inner surface of a face plate, a water repellent layer provided on the light absorbing layer, and a black stripe between the black stripes. It is provided with a phosphor screen composed of the provided phosphor stripes.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory view showing a method of manufacturing a phosphor screen according to a first embodiment of the present invention in the order of steps. In the drawing, 1 is a glass substrate such as a face panel, 21 is a resist stripe pattern, 3 is a light absorbing layer, 4 is a water-repellent layer, 15b is a blue phosphor film, 5b, 5r and 5g are phosphor stripes, and 6 is a black stripe.

A photosensitive resist solution is applied to the glass substrate 1 by spin coating to form a film having a uniform thickness, and then dried to form a resist film. Next, the positions where the red, blue, and green phosphor stripes are formed are exposed using the shadow mask as an exposure mask. The exposed portion of the resist film becomes insoluble in water. When the unexposed portion of the resist film is removed by washing with shower water, the exposed portion remains on the glass substrate as a resist stripe pattern 21. FIG.
(A)｝.

Next, a carbon-containing solution containing, for example, fine particles of carbon graphite or the like is applied by spin coating to form a film having a uniform thickness, and then dried to form the light absorbing layer 3 (FIG. 1B). Further, a water-repellent coating agent is applied thereon by spin coating to form a water-repellent layer 4 (FIG. 1C).
As the water-repellent coating agent, for example, a mixture of fine particles of silicon dioxide and a resin such as acryl dispersed and mixed in a solvent such as isopropyl alcohol is used. Next, the stripe pattern 21 of the resist insoluble in water remaining on the glass substrate 1 is removed with an etching solution containing a hydrogen peroxide solution, and the light absorbing layer 3 and the water repellent layer 4 applied thereon are removed. To form a black stripe 6 {FIG. 1D}.

Next, a blue phosphor slurry is spin-coated. Immediately after the injection of the liquid, the phosphor slurry is applied to the entire surface, but is repelled by the water-repellent layer 4 of the black stripe 6 with the passage of time and drying, and remains only on the glass substrate between the black stripes 6. )｝. Thereafter, the blue phosphor stripe 5b {FIG. 1 (f)}, the red stripe 5r and the green phosphor stripe 5g {FIG. 1 (g)} are formed by performing exposure and development in the same manner as in the prior art.

As described above, in the present invention, the water repellency is not provided to the light absorbing layer 3 in the black stripe, but the water repellent layer 4 is provided on the light absorbing layer 3 so that the black stripe requiring the water repellency is provided. Since only the upper surface of the stripe 6 is made water-repellent, the phosphor screen formed by the method for producing a phosphor screen according to the first embodiment of the present invention has no phosphor on the black matrix. Therefore, a three-color stripe without color mixture can be obtained, and even if the exposure intensity at the time of exposure is increased to increase the area to be exposed to light, the phosphor stripe does not become thicker and sufficient exposure is performed so that the phosphor does not fall off. You can set the intensity.

Further, since the carbon-containing solution (light absorbing layer 3) has no water repellency, the width of the black stripe is not reduced by being repelled by the glass substrate, and the side of the black stripe has no water repellency. There is no gap between the black stripe and the phosphor stripe, and there is an effect that the width of the phosphor stripe and the black stripe can be prevented from being varied. Further, since the water-repellent layer is formed on the black stripe, it does not affect the light absorption characteristics of the black stripe at all.

In the above embodiment, the method of forming a blue phosphor stripe has been described, but there is no problem even if the formation order of the phosphor stripes is changed. Further, in the above-described embodiment, a material in which fine particles of silicon dioxide and a resin are dispersed and mixed in a solvent is used as the water-repellent coating agent, but the same effect can be obtained with an aqueous dispersion solution. Further, as a material exhibiting water repellency, for example, a fluorine resin or the like other than the fine particles of silicon dioxide may be used. In the above embodiment, the application of the resist or the phosphor slurry by spin coating has been described. However, the same effect can be obtained by applying other methods, for example, dipping or screen printing.

Embodiment 2 FIG. A fluorescent screen was formed on the inner surface of the face plate by the manufacturing method of the first embodiment, an electron gun was mounted, and the vacuum was evacuated to manufacture a color cathode ray tube according to the second embodiment of the present invention. Since the color cathode ray tube has a good cutting of the fluorescent screen, even if the width of the phosphor stripe and the black stripe is narrowed for high definition, the color mixture and the variation of the stripe width are prevented, and the effect that the screen uniformity is excellent. Have.

Although the above embodiment has been described with reference to a method of manufacturing a phosphor screen of a color cathode ray tube, it goes without saying that the present invention can be applied to the fabrication of a phosphor screen of a display device such as a plasma display.

[0023]

According to the first method for producing a phosphor screen of the present invention, a step of forming a stripe pattern of a resist on a substrate is provided.
Forming a light-absorbing layer on the stripe pattern of the resist, forming a water-repellent layer on the light-absorbing layer, forming the stripe pattern, a light-absorbing layer and a water-repellent layer formed on the stripe pattern. In the method of removing and forming a black stripe, a method of forming a phosphor film on the black stripe and developing and forming a phosphor stripe between the black stripes, the effect that the phosphor stripe is well cut is obtained. is there.

According to the second method for producing a phosphor screen of the present invention, the method for producing the first phosphor screen is a method in which the water-repellent layer contains fine silicon dioxide particles, and the phosphor stripes are effectively cut. is there.

The first color cathode ray tube of the present invention comprises a black stripe comprising a light absorbing layer provided on the inner surface of a face plate, a water repellent layer provided on the light absorbing layer, and a black stripe provided between the black stripes. Provided with a phosphor screen made of a phosphor stripe having an excellent uniformity of the screen.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a method of manufacturing a phosphor screen according to a first embodiment of the present invention in the order of steps.

FIG. 2 is an explanatory view showing a conventional method of manufacturing a phosphor screen in the order of steps.

FIG. 3 is an explanatory diagram for explaining a state of a black stripe and a phosphor stripe on a phosphor screen according to a conventional phosphor screen manufacturing method.

[Explanation of symbols]

21 Stripe pattern of resist, 3 light absorption layer,
4 water repellent layer, 5b, 5r, 5g phosphor stripe, 6
Black stripe.

Claims (3)

[Claims] A step of forming a stripe pattern of a resist on a substrate; a step of forming a light absorbing layer on the stripe pattern of the resist; a step of forming a water repellent layer on the light absorbing layer; Removing the light absorbing layer and the water repellent layer formed on the stripe pattern to form a black stripe; forming a phosphor film on the black stripe and developing to form a phosphor stripe between the black stripes A method for producing a phosphor screen that performs a step of: 2. The method according to claim 1, wherein the water-repellent layer contains fine silicon dioxide particles. 3. A black stripe comprising a light absorbing layer provided on the inner surface of the face plate, a water repellent layer provided on the light absorbing layer, and a phosphor screen comprising a phosphor stripe provided between the black stripes. Color cathode ray tube equipped.