JPH08236034A - Display surface and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a display surface wherein a contrast characteristic against external light is improved and generating a phenomenon of separating a pattern during a process of manufacture is prevented. CONSTITUTION: A red filter, green filter and a blue filter RF, GF, BF, formed of a fine particle pigment layer, are formed on a transparent substrate 10, and a black matrix layer BM is formed on this filter. Red/green/blue color fluorescent material layers RP, GP, BP of luminous color corresponding to color of the red/green/blue filters RF, GF, BF are formed in a hall part of the black matrix layer BM. Since first a layer of small grain size with large film contracting force is formed, force applied to a lower layer can be reduced in the case of patterning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display surface having a filter layer, and more particularly to a display surface used for a color picture tube.

[0002]

2. Description of the Related Art A color picture tube that has been put into practical use has an envelope including a panel having a fluorescent screen formed on its inner surface and a funnel connected to the panel, and is arranged at the neck of the funnel. An electron beam emitted from an electron gun provided is deflected and scanned by a magnetic field generated by a deflection yoke attached to the outer wall of the envelope to reproduce an image.

This fluorescent screen is formed on the inner surface of the face plate, and fills the black matrix layer made of black pigment particles having circular dots, rectangular dots, or striped holes at predetermined positions and the holes. And a phosphor layer formed in the shape of circular dots, rectangular dots, or stripes.

Normally, a face plate having a low light transmittance, that is, a so-called tint panel or a dark tint panel is used for a color picture tube in order to attenuate the reflection component of external light and increase the contrast ratio. However, the use of such a face plate has a drawback that not only the external light reflection component but also the light emission of the phosphor is attenuated.

Therefore, recently, Japanese Unexamined Patent Publication No. 5-2750
As disclosed in Japanese Patent Publication No. 06, etc., a filter pattern composed of a pigment layer corresponding to the emission color of each phosphor of the phosphor layer is formed between the phosphor layer and the face plate to reflect the phosphor layer. A technique for suppressing and improving the contrast is drawing attention.

FIG. 1 is a schematic sectional view for explaining a conventional display surface. For example, as shown in FIG. 1, red, green, and blue filters R are placed in the holes of the black matrix BM.
F, GF, BF and red, green and blue phosphor layers RP, GP, B
In order to manufacture the phosphor screen with a filter in which P is formed, in addition to the conventionally known phosphor screen manufacturing process, the phosphor layer RP. GP. Filter patterns RF, GF, BF on the front surface of the BP, that is, on the face plate 10 side
Is required. Most recently proposed as a method therefor is to form a filter pattern after forming the black matrix BM on the inner surface of the face plate and before forming the phosphor layer.

As another method for suppressing the above reflection, an optical interference film corresponding to the light emission of the phosphor is formed between the phosphor layer and the face plate as shown in JP-A-54-563. There is something to do. However, from the viewpoint of the number of steps and cost, the method of forming the pigment particle layer corresponding to each phosphor is more advantageous.

[0008]

According to the method of forming the filter pattern composed of the pigment particle layer between the phosphor layer and the face plate, even if a face plate having a high light transmittance is used, the theoretical contrast The emission brightness can be improved. However, in the case where the optical filter pattern is formed between the phosphor layer in the hole portion and the face plate, the diffuse reflection component of the black pigment particles cannot be suppressed, and the expected effect of suppressing external light reflection cannot be obtained.
Therefore, there is a problem that sufficient high brightness and high contrast cannot be obtained.

Further, in the conventional method of manufacturing a phosphor screen with a filter, during the manufacturing process, more specifically, at the stage of forming and patterning a filter layer on a substrate on which a black matrix is formed, the filter layer is formed under the filter layer (on the substrate side). There was a problem that the black matrix of) peeled off.

In view of the above problems, it is an object of the present invention to make the filter substrate having a black matrix and the color picture tube effectively suppress the reflection of external light. Another object of the present invention is to provide a method for manufacturing a filter substrate and a color picture tube in which a black matrix peeling phenomenon does not occur during the manufacturing process.

[0011]

In order to solve the above problems, the present invention corresponds to a plurality of phosphor layers on a transparent substrate, and the emission color of the phosphor layers on the transparent substrate side of the phosphor layers. In a display surface having an optical filter layer containing a color pigment and a black matrix layer containing black pigment particles,
The optical filter layer includes color pigment particles having an average particle diameter of 0.2 μm or less, and is formed on the transparent substrate in a rectangular dot shape, a circular dot shape, or a stripe shape, and the black matrix layer has an average particle diameter of 0.2 to 5 μm. Of black pigment particles and is formed so as to cover the peripheral region of each dot or stripe of the optical filter layer except the central portion.

In the present invention, a color pigment dispersion liquid containing color pigment particles having an average particle diameter of 0.2 μm or less is coated on a transparent substrate and dried to form a color pigment dispersion liquid coating film. To form a rectangular dot-shaped, circular dot-shaped, or stripe-shaped color optical filter layer, and black containing black pigment particles having an average particle diameter of 0.2 to 5 μm on the color optical filter layer. The pigment dispersion is applied and dried to form a black pigment layer, the black pigment layer is patterned, the black pigment layer is partially removed except for the peripheral region of the pigment layer, and each of the color optical filter layers is formed. Exposing the central portion of the dot or stripe and forming a black matrix layer so as to cover the peripheral area of each dot or stripe of the color optical filter layer; A suspension containing a phosphor is applied on the optical filter layer, a phosphor coating film is formed, and by patterning, an emission color corresponding to the color of the pigment contained in the optical filter layer is formed on the optical filter layer. And a step of forming the phosphor layer having the same in any order.

According to the present invention, since the filter layer made of the fine particle pigment is formed between the black matrix made of the black pigment particles and the substrate, the diffused reflection component due to the black pigment particles is suppressed and the external light on the display surface is suppressed. The contrast characteristic with respect to can be improved. Therefore, when the display surface of the present invention is used, a color picture tube having excellent brightness and contrast can be obtained.

Further, according to the manufacturing method of the present invention, patterning is started from the one having a smaller grain size, so that the pattern already formed in the manufacturing process may be peeled off when the upper layer is patterned. It is possible to obtain a good display surface and a color picture tube.

The inventors of the present invention have found that the problems with the conventional phosphor screen with a filter are i) that the expected external light reflection preventing effect cannot be obtained, and that ii) the black matrix layer is easily peeled off during production. The cause was examined.

As a result, regarding i), it was found that diffuse reflection due to the pigment particles forming the black matrix is conspicuous as the transmittance of the face plate as a transparent substrate is increased. Due to this diffuse reflection, it was not possible to obtain the high brightness and high contrast that could be expected by using the filter.

More specifically, since the pigment particles contained in the optical filter layer formed between the face plate and the phosphor layer have an average particle diameter of 0.2 μm or less, the irregular reflection phenomenon due to the particles does not occur. The black pigment particles contained in the black matrix layer have an average particle diameter of 0.2 μm to 5 μm.
Since the particles are relatively large (μm), diffuse reflection of external light occurs in the black matrix layer. This diffuse reflection did not pose a problem because the face plate used in the past had a low light transmittance, but with the increase in the transmittance of the face plate, the diffuse reflection in the black matrix layer became noticeable without being attenuated. It was.

In short, in the conventional color picture tube having the filter substrate and the phosphor screen with the filter, the black matrix layer which is the non-light emitting portion was not considered, that is, the diffuse reflection in the black matrix layer was not prevented at all, as expected. This was the reason why the effect of preventing external light reflection was not obtained.

Regarding ii), the phenomenon of peeling of the black matrix occurs during the manufacturing process because the force due to the film contraction is different between the optical filter layer and the black matrix layer during the process of drying the coating film. It turned out that it was caused by doing.

This will be described in detail below. The force based on the film shrinkage generated in the process of drying the coating film is represented by the following formula I, where P is the shrinking force, γ is the surface tension, and r is the radius of the void. P = 2γ / r Formula I The smaller the particle size, the smaller the radius r of the void. Therefore, it can be seen from Formula I that the shrinkage force P increases as the particle size decreases.

The average particle size of the pigment particles used in the optical filter layer is 0.2 μm or less, while the average particle size of the black pigment particles used in the black matrix layer is 0.2 to 5 μm. There is a large difference between the shrink force of the matrix layer and the shrink force of the optical filter layer. The peeling of the black matrix layer was caused by the difference between the shrinking force of the black matrix layer and the shrinking force of the optical filter layer.

From the above, the inventors of the present invention have devised the constitution so as to prevent the irregular reflection of external light in the black matrix layer and prevent it from being affected by the contracting force of the optical filter layer. , Ii), and thus the present invention has been accomplished.

According to a first aspect of the present invention, an optical filter including a plurality of phosphor layers on a transparent substrate and a color pigment corresponding to the emission color of the phosphor layer on the transparent substrate side of the phosphor layers. In the display surface having a layer and a black matrix layer containing black pigment particles, the optical filter layer contains color pigment particles having an average particle size of 0.2 μm or less, and is a transparent substrate in a rectangular dot shape, a circular dot shape, or a stripe shape. The black matrix layer formed on the top surface has an average particle size of 0.2.
To 5 μm of black pigment particles, and is formed so as to cover the peripheral area of each dot or stripe of the optical filter layer except the central portion.

In the conventional display surface, the black matrix layer was directly formed on the transparent substrate, and there was no optical filter layer between them. However, in the display surface of the present invention, the black matrix layer and the transparent substrate are formed. An optical filter layer is formed on at least a part of the space, and the optical filter layer suppresses irregular reflection of external light on the black matrix layer. Thereby, in the color picture tube using this display surface, the contrast and the brightness can be improved.

Here, when the optical filter layers of respective colors are formed, for example, in the shape of circular dots, a gap is formed between the circles of the filter layer, and in this gap, the black matrix layer is directly formed on the substrate and the optical filter is formed. Since there is no layer, the optical filter layer will be formed in a part between the black matrix layer and the face plate. On the other hand, the optical filter layers of each color are adjacent to each other without a gap so as to cover the entire substrate, for example, if formed in a stripe shape, the optical filter layer is interposed between the black matrix layer and the substrate, Diffuse reflection of black pigment particles can be more effectively suppressed over the entire surface of the substrate.

Further, according to the second aspect of the present invention, a color pigment dispersion liquid containing color pigment particles having an average particle diameter of 0.2 μm or less is coated on a transparent substrate and dried to form a color pigment dispersion liquid coating film. And patterning the coating film to form a rectangular dot-shaped, circular dot-shaped, or stripe-shaped color optical filter layer, and an average particle size of 0.2 to 5 μm on the color optical filter layer. The black pigment dispersion containing the black pigment particles is applied and dried to form a black pigment layer, and the black pigment layer is patterned to form a black pigment layer except for the peripheral region of each dot or stripe of the optical filter. Partially remove it to expose the central part of each dot or stripe of the optical filter layer and cover the peripheral area of each dot or stripe of the color optical filter layer. The step of forming a black matrix layer, applying a suspension containing a phosphor on the color optical filter layer, forming a phosphor coating film, by patterning, on the optical filter layer, included in the optical filter layer And a step of forming a phosphor layer having an emission color corresponding to the color of the pigment to be formed in an arbitrary order.

The color optical filter layer is formed by applying a dispersion liquid containing color pigment particles and a resist to form a coating film, exposing the coating film, and developing the exposed coating film. By repeating according to the number, it is possible to form each color. The color optical filter layer thus obtained has a gap between the dots, particularly when it is in the shape of a circular dot.

The color optical filter layer can also be manufactured by the following method. For example, when forming an n-color optical filter layer, a resist solution is applied to form a resist film before applying the first pigment dispersion liquid. By exposing and developing the resist film, a resist pattern is formed in the region where the second color optical filter layer is formed. The first pigment dispersion liquid is applied onto the resist pattern and dried to form a pigment dispersion liquid coating film. A resist decomposing liquid is applied on the first pigment dispersion liquid coating film, and the resist pattern in the region where the second to nth color optical filter layers are to be formed is formed together with the first color formed on the resist pattern. The pigment dispersion coating is removed to expose the substrate in the area.

Then, on the exposed substrate, first, the second
Is applied to form a second pigment dispersion liquid coating film, and the pigment dispersion liquid coating film is exposed and developed to pattern the second color optical filter layer. Similarly, patterning is sequentially repeated until the nth color optical filter layer is formed.

Since the portions corresponding to the gaps between the color optical filter layers thus obtained are filled with the first color optical filter layers, no gaps are formed. Therefore, in the case of circular dots, the diffused reflection of the black pigment particles can be more effectively suppressed on the display surface obtained by the latter method than in the former method.

The black matrix layer can be formed, for example, as follows. A resist solution is applied on the color optical filter layer to form a resist coating film. Patterning is performed by exposing and developing the resist coating film, and a resist layer is formed in a region near the center of each dot or stripe of the color optical filter layer where a phosphor layer is to be formed. Next, a black pigment dispersion is applied on the color optical filter layer on which the resist layer is formed to form a black pigment layer. A resist decomposer is applied on the black pigment layer to remove the resist layer and the black pigment layer in the region where the phosphor layer is to be formed. In this way, the black matrix layer can be formed so that the central portion of each optical filter layer is exposed and the peripheral portion of the color pigment layer is covered.

In the conventional method, since the optical filter layer was formed on the black matrix layer, it was formed under the influence of the strong shrinking force which occurs when the coating film of the optical filter layer is dried. The black matrix layer was easy to peel off. However, in the manufacturing method of the present invention, since the pattern of the optical filter layer is formed before the black matrix layer, the black matrix layer is not affected by the shrinkage force of the optical filter layer. In addition, the weak shrinking force that occurs when the black matrix layer is applied and dried is not enough to peel off the optical filter layer provided thereunder. In other words, the smaller the particle size, the greater the film shrinkage force at the time of film formation. Therefore, in the manufacturing method of the present invention, by forming the film having the larger film shrinkage force first, the lower layer when patterning the upper layer is formed. It is possible to reduce the force applied to. As described above, according to the present invention, a display surface, for example, a fluorescent screen with a filter can be obtained without peeling the black matrix layer.

The color pigment particles used in the present invention have an average particle size of 0.005 μm in order to obtain an optical filter which transmits desired light and has sufficient transparency and film forming property.
m to 0.2 μm. This is because if it is larger than 0.2 μm, scattering becomes a problem, while the practically usable pigment having a small particle size is about 0.005 μm. A more desirable particle size is 0.01 μm to 0.15 μm. Specifically, the following pigments can be exemplified.

As the red pigment, ferric oxide type trade name Sicotrans Red L-2817 (particle diameter 0.01) is used.
μm-0.02 μm, manufactured by BASF), and anthraquinone-based product name Chromophartal Red A2B (particle diameter 0.01 μm, manufactured by Ciba Geigy). As a blue pigment, a cobalt aluminate (Al ₂ O ₃ —CoO) type trade name, Cobalt Blue X (particle diameter 0.01 μm-
0.02 μm, manufactured by Toyo Pigment Co., Ltd.) and phthalocyanine blue-based product name Rionol Blue FG-7330 (particle diameter 0.01 μm, manufactured by Toyo Ink Co., Ltd.). As the green pigment, TiO ₂ —NiO—CoO—ZnO-based product name Dipiroxide TM Green # 3320 (particle diameter 0.01 μm to 0.02 μm, manufactured by Dainichiseika Co., Ltd.), CoO
-Al ₂ O ₃ -Cr ₂ O ₃ -TiO ₂ system, trade name Dipiroxide TM Green # 3340 (particle size 0.0
1 μm to 0.02 μm, manufactured by Dainichiseika Co., Ltd., CoO-Al
₂ O ₃ -Cr ₂ O ₃ system product name Dipiroxide T
M Green # 3420 (particle diameter 0.01 μm to 0.02
μm, made by Dainichiseika Co., Ltd., chlorinated phthalocyanine green type trade name Fastgen Green S (particle size 0.
01 μm, manufactured by Dainippon Ink and Co., Ltd., brominated phthalocyanine green type trade name Fastgen Green 2YK
(Particle diameter 0.01 μm, manufactured by Dainippon Ink and Chemicals, Inc.) can be exemplified.

The black second pigment particles preferably have an average particle size of 0.2 μm to 5 μm, and specifically, graphite particles can be used. As described above, according to the method of the present invention, even in the manufacturing process of the phosphor screen, the color optical filter layer composed of the fine particle pigment layer having a small particle size is formed first, and then the black matrix layer is formed. Even if black pigment particles having a large particle diameter are formed on the coating film to form the coating film, the pattern of the fine particle pigment layer having a small particle diameter thereunder is not peeled off and a good fluorescent surface is formed. can get.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific examples of the present invention will be described in more detail with reference to the drawings.

Example 1 FIG. 2A shows the position of the optical filter layer and the black matrix layer on the display surface where the circular dot optical filter layer and the black matrix layer are formed on the transparent substrate. FIG. 2B is a plan view schematically showing from the side, and FIGS. 2B and 2C are schematic cross-sectional views showing the XX cross section and the YY cross section of FIG. 2A, respectively.

In FIG. 2 (a), the shaded area indicates the region where the black matrix layer exists, and the portion surrounded by the broken line circle indicates the hole portion where the black matrix layer does not exist, which is surrounded by the solid line circle. The open part indicates a region where the circular dot-shaped optical filter layer is formed. As shown in FIG. 2A, the red filter RF, the green filter GF, and the blue filter BF are formed on the transparent substrate 10 so as to be adjacent to each other. The red filter RF is a red pigment composed of red iron oxide particles having an average particle size of 0.01 μm, and the green filter GF is a green pigment composed of cobalt green having an average particle size of 0.01 μm.
The blue filters BF are each formed of a blue pigment made of cobalt blue having an average particle diameter of 0.01 μm.

Further, as shown in FIGS. 2B and 2C, a black matrix layer BM made of graphite particles is provided on the optical filter layers RF, GF, BF made of such color pigment fine particles. Is formed. Figure 2
Each dot-shaped filter layer RF, GF in FIG.
As shown in FIG. 2B, the black matrix layer BM is not formed in the central portion of the BF, that is, in the circular area indicated by the broken line, and the hole portion 20 is formed. The black matrix layer BM is a filter layer of each color. It is formed so as to cover between the color filter and the peripheral area excluding the central hole portion 20 of RF, GF, and BF.

Further, as shown in FIG. 2C, the black matrix layer BM is formed on the substrate 10 in the area between the dots which is not filled up even if the circular dot-shaped pigment particle layers are densely arranged. . In this case, as is clear from FIGS. 2A and 2C, the optical filter layer is formed between the black matrix layer BM and the substrate 10 at least in the region between the circle indicated by the solid line and the circle indicated by the broken line. The structure is located between them.

By forming as described above, the coverage of the fine particle pigment layer covering the front surface of the black matrix, that is, the substrate side was 0% in the conventional structure, compared with 0%.
The coverage of the fine particle pigment layer on the front surface of the black matrix on the display surface of the present invention is remarkably high.

Next, an example of the method of manufacturing the display surface of the present invention will be described. 3A to 3G are views for explaining an example of the method for manufacturing the display surface of the present invention.

First, as shown in FIG. 3A, red iron oxide particles are prepared as red pigment on one surface of a transparent transparent substrate 10, and ammonium bichromate / poval type photoresist is mixed therein. Thus, a red pigment dispersion liquid was prepared, and the obtained red pigment dispersion liquid was applied and dried. Then, the red dot positions are exposed and developed to form the red filter layer RF.

Next, cobalt blue was prepared as a blue pigment, and an ammonium dichromate / poval type photoresist was mixed with this to prepare a blue pigment dispersion, and the obtained blue pigment dispersion was applied. After drying, the blue dot positions are exposed and developed, and the blue filter layer B is exposed as shown in FIG.
Form F. In the same manner, cobalt green was used as a green pigment to form a green filter layer GF as shown in FIG. 3 (c).

Next, as shown in FIG. 3D, a bisazide / polyvinylpyrrolidone photoresist was applied to form a resist layer 32. After that, the green, blue, and red dot positions are exposed and developed by a method known in the art, and then, as shown in FIG.
Resist patterns 34R, 34G, as shown in FIG.
34B was formed. Figure 3 is applied to a graphite dispersion liquid 40 as shown in (f) to form a coating film, by applying a resist decomposition agent, the resist pattern 34R, 34G, 34B to decompose, about 4~8kg / cm ² The resist patterns 34R, 34G, 34B and the graphite coating film formed thereon are removed by high-pressure spray water development, and as shown in FIG. 3 (g), red, green, and blue dot positions, that is, hole portions 20 are removed. The black matrix layer BM was formed in a place other than the above. The red pigment dispersion, blue pigment dispersion, and green pigment dispersion have the compositions shown in Tables 1 to 3 below.

[0046]

[Table 1] (Red pigment dispersion) Shicotrans Red L-2817 dispersion 8 g Poval EG-40 (manufactured by Nippon Synthetic Chemical Industry) 0.9 g Ammonium dichromate (manufactured by Kanto Kagaku) 0.05 g Water 120 g

[0047]

[Table 2] (Blue pigment dispersion) Cobalt blue X dispersion 8 g Poval EG-40 (manufactured by Nippon Synthetic Chemical Industry) 0.9 g Ammonium dichromate (manufactured by Kanto Kagaku) 0.05 g Water 50 g

[0048]

[Table 3] (Green pigment dispersion) Daipyroxide side green dispersion 8 g Poval EG-40 (manufactured by Nippon Synthetic Chemical Industry) 0.9 g Ammonium dichromate (manufactured by Kanto Kagaku) 0.05 g Water 70 g Dispersion of color pigment The agent may be any agent as long as it can disperse the pigment, but it is preferable to use either an anionic or nonionic dispersant or a mixture thereof.

As the anionic dispersant, acrylic type,
Examples thereof include acrylic-styrene type, acrylic copolymer, polycarboxylic acid type, naphthalenesulfonic acid formalin condensate, polyoxyethylene alkyl ether sulfate and the like. Examples of nonionic dispersants include polyoxyethylene lauryl ether, polyoxyethylene derivatives, polyoxyalkylene alkyl ethers, polyoxyethylene nonylphenyl ethers, and polyoxyethylene sorbitan monolaurate.

Examples of the photoresist include chromate / poval type, diazonium salt / poval type, stibasol type, chromate / casein type and the like. Examples of the resist decomposing agent used include H ₂ SO ₄ , acids such as sulfamic acid and HNO ₃ , H ₂ O ₂ , MnKO ₄ and KI.
Examples thereof include peroxides such as O ₄ and NaIO ₄ , or thiourea and mixtures thereof.

When the display surface is formed by such a method, the phenomenon that the pattern already formed is separated during the forming process does not occur. Further, in the obtained display surface, since the color optical filter layer composed of the fine particle pigment layer is located between the black matrix layer and the substrate, diffuse reflection due to the black pigment particles is reduced and the contrast characteristic of the display surface is improved. did.

If necessary, colloidal silica, water glass or the like may be applied as a protective film for the color optical filter layer after forming the filter layer and before forming the black matrix layer. Further, a silane coupling agent or the like may be applied for the purpose of improving the adhesive force of the pigment particles of the black matrix layer.

(Example 2) In Example 1, a black matrix layer containing black pigment particles was formed in the gaps between the dots of each color optical filter layer, but a filter containing fine particle pigment was formed on the entire surface of the substrate. It is also possible to cover with a layer and form a black matrix layer on it. FIG.
Another example of the method for manufacturing the display surface of the present invention will be described with reference to (a) to (f).

First, on one surface of the clean transparent substrate 10,
A coating solution is formed by applying a photoresist solution of ammonium dichromate / Poval system. Then, the blue dot positions and the green dot positions are exposed and developed, and the resist patterns 50G and 50B as shown in FIG.
Leave.

Next, as shown in FIG. 4 (b), a red pigment particle dispersion using red iron oxide as a red pigment is applied and dried,
After that, the resist patterns 50G and 50B are peeled off with a decomposing agent, and the red filter RF is formed in a region other than the green dot positions and the blue dot positions as shown in FIG. 4C.

Then, cobalt blue as a blue pigment is coated with a blue pigment dispersion liquid in which ammonium dichromate / Poval type photoresist is mixed, and the blue dot position is exposed and developed. Form the blue filter BF as shown. Then, using the same method, cobalt green is used as shown in FIG.
Form F.

Then, a bisazide / polyvinylpyrrolidone-based photoresist is applied to form a resist layer, and the green, blue, and red dot positions are exposed and developed by a conventionally known method to form a resist pattern, The black matrix layer BM is formed at each dot position of green, blue, and red, that is, at a position other than the hole portion 20, through the steps of coating the graphite suspension, treating the decomposing agent, and developing.

As shown in FIG. 4 (f), the obtained filter substrate is a filter RF, GF, BF comprising a fine particle pigment layer on the substrate 10 side of the black matrix layer BM.
Since they are arranged without gaps, diffused reflection by the black pigment particles forming the black matrix layer can be further reduced as compared with the first embodiment.

(Embodiment 3) Although the dot-shaped filter layer has been described in the above embodiment, a filter layer having another shape will be exemplified here.

FIG. 5A is a schematic diagram showing a display surface having a stripe-shaped black matrix layer as viewed from the substrate side. The diagonal lines indicate the area where the black matrix layer is present. Further, FIG. 5B is a schematic diagram showing a C-C cross section of FIG. 5 (a) and 5 (b)
As shown in FIG. 5, on this display surface, the filter layers RF, GF, BF are formed on the substrate 10 in a stripe shape with almost no space, and on the filter layers RF, GF, BF,
A stripe-shaped black matrix layer BM is formed so as to cover the peripheral region of the filter layer except the central portion.

The filter substrate of this embodiment is also the same as that of the first embodiment.
Alternatively, it can be manufactured by the same method as in No. 2, and the pattern peeling phenomenon did not occur in the forming process. Also,
In this embodiment, the proportion of the fine particle pigment layer between the black pigment particles and the substrate, that is, the coverage is higher than that of the first embodiment, and the degree of contrast improvement is higher than that of the first embodiment.

(Embodiment 4) An embodiment in which the present invention is applied to a color picture tube will be described below. FIG. 6 is a partially cutaway sectional view illustrating an example of the color picture tube according to the present invention. Color picture tube 60 according to the present embodiment
Has a glass envelope 61 whose inside is evacuated. The envelope 61 includes a neck portion 62 and the neck portion 62.
And a funnel portion 63 continuous to
3 includes a face plate 10 made of frit glass.
Are joined. Further, a metal explosion-proof band 65 is wound around the side wall of the face plate 10. An electron gun for emitting a plurality of electron beams is arranged in the neck portion 62, and a phosphor screen 67 including a filter layer and a phosphor layer is formed on the inner surface of the face plate 10. An image is reproduced by deflecting and scanning an electron beam by a magnetic field generated by a deflection yoke mounted on the outer wall of the envelope.

Next, the structure of the fluorescent screen 67 will be described with reference to FIG. The fluorescent screen 67 is, for example, one of the first to third embodiments.
Any of the above filter substrates having a phosphor layer formed thereon can be used. As shown in FIG. 7, in the hole portion of the black matrix layer BM, a red filter, a green filter, and a blue filter RF, GF, BF, which are fine particle pigment layers, are formed.
A red phosphor layer, a green phosphor layer, and a blue phosphor layer RP, Gp, and BP having an emission color corresponding to the above color are formed. The transmissivity of the face plate 10, which is a transparent substrate, is about 9
It is as clear as 0%.

According to the color picture tube having such a phosphor screen, the emission brightness of the phosphor layers RP, GP, BP is proportional to the transmittance of each color filter RF, GF, BF, and the face plate which is the substrate is also Since it is clear, there is little attenuation of the luminescent component of the phosphor. On the other hand, each color filter has a low transmittance for light other than the emission component of the corresponding phosphor, and the light other than the emission component of the phosphor of the external light (in FIG. For example, for the red filter RF, light other than red has a low transmittance of 2%.
It decays in proportion to the power. Therefore, the reflection component of outside light is attenuated by each color filter, so that the contrast is improved.

Further, red, green, and blue fine particle pigment layers having an average particle size of 0.2 μm or less are provided on the substrate side of the black pigment particles having an average particle size of 0.2 μm to 5 μm which compose the black matrix layer BM. The structure reduces diffuse reflection at the boundary with the substrate. Therefore, even if the transmittance of the substrate is increased, the diffused reflection component of the black pigment particles can be suppressed, so that the deterioration of the contrast can be prevented. Therefore, the filter effect on the front surface of the phosphor layer can be maximized.

The fluorescent screen of such a color picture tube is obtained by forming the black matrix layer in each of the above-mentioned embodiments and then forming the phosphor layer in the hole portion by a usual method.

[0067]

As described above, according to the present invention,
Since the filter layer made of fine particle pigments is also formed between the black matrix made of black pigment particles and the substrate, it is possible to suppress the diffused reflection component due to the black pigment particles and improve the contrast characteristic of the display surface against the external light. it can. Therefore, when the display surface of the present invention is used,
A color picture tube with good contrast can be obtained.

Also in the manufacturing process of the display surface, since the fine particle pigment layer having a small particle size is formed first, the black pigment particles having a large particle size are formed thereon to form the coating film. Even if patterned, the pattern of the fine particle pigment layer having a small particle size thereunder is not peeled off, and a good display surface can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view for explaining a conventional display surface.

2 (a) to 2 (c) are views showing an example of a display surface of the present invention, FIG. 2 (a) is a schematic plan view, and FIG. 2 (b) is FIG. 2 (a). ) Is a schematic cross-sectional view showing an X-X cross section of
FIG. 2C is a schematic cross-sectional view showing the YY cross section of FIG.

FIG. 3A to FIG. 3G are views for explaining an example of the method for manufacturing the display surface of the present invention.

4 (a) to 4 (f) are views for explaining another example of the method for manufacturing the display surface of the present invention.

5A and 5B are views showing another example of the display surface of the present invention, FIG. 5A is a schematic plan view, and FIG. 5B is FIG.
It is a schematic cross section which shows CC cross section of (a).

FIG. 6 is a schematic view showing an example of a color picture tube to which the display surface of the present invention can be applied.

FIG. 7 is a schematic cross-sectional view for explaining the phosphor screen of FIG.

[Explanation of symbols]

 10 ... Transparent substrate RF ... Red filter layer GF ... Green filter layer BF ... Blue filter layer BM ... Black matrix layer RP ... Red phosphor layer GP ... Green phosphor layer BP ... Blue phosphor layer

Claims (8)

[Claims] 1. A plurality of phosphor layers on a transparent substrate, an optical filter layer containing a color pigment corresponding to the emission color of the phosphor layer on the transparent substrate side of the phosphor layer, and a black containing black pigment particles. In the display surface having a matrix layer, the optical filter layer includes color pigment particles having an average particle size of 0.2 μm or less, and is formed in a rectangular dot shape, a circular dot shape, or a stripe shape on the transparent substrate, and the black matrix layer is , Average particle size 0.2 to 5μ
A display surface comprising m black pigment particles and formed so as to cover a peripheral region of each dot or stripe of the optical filter layer except the central portion thereof. 2. The optical filter layer includes a red optical filter layer containing red pigment particles, a blue optical filter layer containing blue pigment particles, and a green optical filter layer containing green pigment particles. The display surface according to claim 1. 3. The display surface according to claim 1, wherein the gap between the optical filter layers is filled with black pigment particles. 4. The display surface according to claim 1, wherein the optical filter layer is formed without a gap. 5. A color pigment dispersion liquid containing color pigment particles having an average particle size of 0.2 μm or less is applied onto a transparent substrate and dried to form a color pigment dispersion liquid coating film, and the coating film is patterned. Forming a rectangular dot-shaped, circular dot-shaped, or stripe-shaped color optical filter layer, and a black pigment dispersion liquid containing black pigment particles having an average particle diameter of 0.2 to 5 μm on the color optical filter layer. Application,
A black pigment layer is formed by drying, and the black pigment layer is patterned to partially remove the black pigment layer except for the peripheral area of each dot or stripe of the color optical filter layer. A step of exposing a central portion of each dot or stripe and forming a black matrix layer so as to cover a peripheral area of each dot or stripe of the color optical filter layer; and a suspension containing a phosphor on the color optical filter layer. And forming a phosphor coating film, by patterning, on the optical filter layer, to form a phosphor layer having an emission color corresponding to the color of the pigment contained in the optical filter layer in any order A method of manufacturing a display surface, comprising: 6. In the step of forming the color optical filter layer, as the color pigment dispersion liquid, a red pigment dispersion liquid containing red pigment particles, a blue pigment dispersion liquid containing blue pigment particles, and a green pigment containing green pigment particles, respectively. Using the pigment dispersion, the steps of forming the optical filter layer are performed in an arbitrary color order, a red optical filter layer containing red pigment particles, a blue optical filter layer containing blue pigment particles, and a green optical containing green pigment particles. The method for manufacturing a display surface according to claim 5, wherein a filter layer is formed. 7. The step of forming the color optical filter layer includes the steps of applying a dispersion containing a color pigment and a resist to form a coating film, exposing the coating film, and developing the exposed coating film. 7. The method of manufacturing a display surface according to claim 6, further comprising the step of repeating the step of performing the step according to the number of colors. 8. The color optical filter layer includes a first optical filter layer and a second optical filter layer, and in the step of forming the color optical filter layer, before applying the first pigment dispersion liquid, Applying a resist solution to form a resist layer; exposing and developing the resist layer to form a resist pattern in a region where a second color optical filter layer is to be formed; A step of forming a pigment dispersion coating film by coating and drying the pigment dispersion liquid, and a region where the second color optical filter layer is formed by applying a resist decomposition liquid on the first pigment dispersion coating film. A step of removing the pigment dispersion liquid coating film of the first color formed thereon together with the resist layer pattern in the step of exposing the substrate in the area, and the second pigment on the exposed substrate. And a step of forming a second pigment dispersion coating film by applying a liquid dispersion, and a step of patterning the second color optical filter layer by exposing and developing the pigment dispersion coating film. The method for manufacturing a display surface according to claim 5.