JPH08138550A - Manufacture of color cathode-ray tube with high contrast - Google Patents

Abstract

PURPOSE: To establish a manufacturing method for a color cathode-ray tube with high contrast which allows simplification of the manufacturing processes and gives a high performance fluorescent film at a low cost. CONSTITUTION: A red pigment particle suspension using photo-resist is applied to the inner surface of a face plate 4 and red filter layers 16R are provided in the positions of a red phosphor layer and a black matrix 15 through this suspension applying process and the photo-exposure and development processes. A green pigment particle suspension using photo-resist is applied and green filter layers 16G are provided in the positions of a green phosphor layer and black matrix 15 through this suspension applying process and the photo-exposing and developing processes. A blue pigment particle suspension using photo-resist is applied and blue filter layers 16B are provided in the positions of a blue phosphor layer and black matrix 15 through this suspension applying process and the photo-exposing and developing processes. The black matrix produced is a laminate of three-color separate filter layers and three-color filter layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high-contrast color cathode ray tube, and in particular, in the case of constructing filter layers of three colors, the manufacturing process of the high-contrast color cathode ray tube is remarkably shortened. Manufacturing method.

[0002]

2. Description of the Related Art Generally, as a high-contrast color cathode ray tube, a microfilter type color cathode ray tube is known.

FIG. 6 is a cross sectional view showing a cross section of a part of the fluorescent film of such a known color filter type color cathode ray tube.

In FIG. 6, 41 is a face plate of a color cathode ray tube, 42 is a black matrix, 43R is a red filter layer, 43G is a green filter layer, 43B is a blue filter layer, 44R is a red fluorescent layer, and 44G is green. Fluorescent material layer, 44B is a blue fluorescent material layer.

A black matrix 42 is formed on the inner surface of the face plate 41 at predetermined intervals, and the red filter layers 43 are alternately arranged between the black matrices 42 so as to be in contact with the inner surface of the face plate 41.
R, a green filter layer 43G, and a blue filter layer 43B are arranged and formed. In addition, on the upper side of the red filter layer 43R, the green filter layer 43G, and the blue filter layer 43B, the corresponding red fluorescent layer 44R and green fluorescent layer 44 are respectively provided.
G, the blue phosphor layer 44B is disposed and formed.

According to this micro-filter type color cathode ray tube, the external light incident from the outside of the face plate 41 receives the red filter layer 43R and the green filter layer 4.
Since they are respectively absorbed by the 3G and blue filter layers 43B, the external light component reflected by the portion of the fluorescent film on the inner surface of the face plate 41 is greatly reduced, and the contrast can be enhanced.

To manufacture the micro-filter type color cathode ray tube having the above-mentioned structure, the manufacturing process is carried out through the following outline.

First, a black matrix 42 is formed on a predetermined portion of the inner surface of the face plate 41 of the color cathode ray tube. Next, the first on the black matrix 42
A suspension containing a color, for example, a red ultrafine particle pigment is applied, and a first color, for example, a red filter layer 43R is formed by exposure and development using a photomask (not shown). Then, this first color, for example red filter layer 43
On R, a suspension containing a first color, for example, red phosphor particles, which is not coated with a pigment, is applied, and the first color, for example, by exposing and developing using a photomask (not shown), Forming a red phosphor layer 44R. Then, the second
A suspension containing a color, eg, green, ultrafine pigment is applied, and the second is obtained by exposing and developing using a photomask.
A color, for example, a green filter layer 43G is formed, and similarly,
A second color, for example, a green phosphor layer 44G is formed by applying a suspension containing phosphor particles of a second color that does not adhere to a pigment, and exposing and developing it using a photomask. To do. After that, a suspension containing a third color, for example, blue ultrafine particle pigment is applied, and the third color, for example, blue filter layer 43 is formed by exposure and development using a photomask.
A third color, which forms B and, in the same way, does not deposit a pigment,
For example, a suspension containing blue phosphor particles is applied, and a third color, for example, a blue phosphor layer 44B is formed by exposure and development using a photomask.

[0009]

In the known method for manufacturing a color cathode ray tube of the micro filter system, the black matrix forming step and the filter layers 43R, 43G and 43B for each of the first to third colors are formed. Steps (this includes a suspension application step, an exposure step using a photomask, and a development step, and when all these steps are included, there are 9 steps), first to third colors For each of the above, the steps of forming the phosphor layers 44R, 44G, and 44B (which also include the step of applying the suspension, the step of exposing using the photomask, and the step of developing are included. , And 9 steps), and only 10 steps are required to form the black matrix and the filter layers 43R, 43G, and 43B for the first to third colors. Body to have many steps and, consequently, a complicated manufacturing process, there is a problem that increase in cost.

Further, in the known method of manufacturing a color cathode ray tube of the micro filter system, the first color to the third color are used.
Since the particle size of the pigment particles used in the color filter layers 43R, 43G, 43B is small, it is easy for other color pigment particles to be mixed in when the filter layers 43R, 43G, 43B of the first to third colors are formed. There is a problem of becoming.

However, in order to avoid mixing of pigment particles of other colors when forming the filter layers 43R, 43G, and 43B of the first to third colors, the first to third colors are used.
This can be solved by providing a precoat layer when forming each of the color filter layers 43R, 43G, and 43B. However, if such a precoat layer is repeatedly formed for each color, There is a problem that the number of processes increases, the manufacturing process becomes more complicated, and the cost increases.

The present invention eliminates the above-mentioned problems, and its purpose is to simplify the manufacturing process, to reduce the cost,
It is an object of the present invention to provide a method for manufacturing a high-contrast color cathode ray tube capable of obtaining a high-performance fluorescent film.

[0013]

In order to achieve the above-mentioned object, the present invention forms a photoresist pattern on the inner surface of a face plate of a color cathode ray tube at the positions where the second and third color phosphor layers are arranged. And a step of applying a suspension of the pigment of the first color to the inner surface of the face plate including the photoresist pattern, and processing and developing the stripping solution to dispose the fluorescent layer of the first color and the black matrix. A step of forming a first color filter layer at an arrangement position, a step of forming a photoresist pattern at an arrangement position of the first color and third color phosphor layers on the inner surface of the face plate, and a step of forming a photoresist pattern on the photoresist pattern. A second color pigment suspension is applied to the inner surface of the face plate containing, and the second color phosphor layer is arranged and the black matrix is arranged by peeling treatment and development. A step of forming a filter layer of a second color; a step of forming a photoresist pattern on the inner surface of the face plate at the positions where the fluorescent layers of the first and second colors are arranged; The suspension of the third color pigment is applied to the inner surface of the face plate, and the third color filter layer is formed at the arrangement position of the third color phosphor layer and the black matrix arrangement position by the stripping solution treatment and the development. And a step of forming a black matrix composed of individual filter layers of the first to third colors and stacked filter layers of the first to third colors.

[0014]

According to the above means, when the filter layer of the first color is formed first, then the filter layer of the second color is formed, and subsequently, the filter layer of the third color is formed, The first color filter layer and the second
Since the black matrix having the laminated structure of the color filter layer and the third color filter layer can be simultaneously formed, the black matrix forming step required in the known micro-filter type color cathode ray tube can be omitted. Accordingly, the manufacturing process can be simplified and the cost can be reduced.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the structure of a high-contrast type color cathode ray tube having a color fluorescent film manufactured by the manufacturing method according to the present invention.

In FIG. 1, 1 is a panel portion, 2 is a funnel portion, 3 is a neck portion, 4 is a face plate, 5 is a color fluorescent film, 6 is a shadow mask, 7 is a mask frame, 8 is a deflection yoke, and 9 is a deflection yoke. Is an in-line electron gun, 10 is a purity adjusting magnet, 11 is a center beam static convergence adjusting magnet, 12 is a side beam static convergence adjusting magnet, 13 is a magnetic shield, and 14 is an electron beam.

The glass tube constituting the color cathode ray tube has a panel portion 1 arranged on the front side, a neck portion 3 accommodating an in-line type electron gun 9, and a panel portion 1.
And a funnel portion 2 arranged in the middle of the neck portion 3. The panel portion 1 has a face plate 4 on the front surface, and the color fluorescent film 5 is arranged and formed on the inner surface of the face plate 4. A mask frame 7 is fixedly arranged inside the peripheral portion of the panel portion 1, and the shadow mask 6 is attached by the mask frame 7 so as to be arranged so as to face the color fluorescent film 5. A magnetic shield 13 is provided inside the connecting portion between the panel portion 1 and the funnel portion 2, and a deflection yoke 8 is provided outside the connecting portion between the funnel portion 2 and the neck portion 3. A purity adjusting magnet 10, a center beam static convergence adjusting magnet 11 and a side beam static convergence adjusting magnet 12 are arranged side by side on the outer side of the neck portion 3, and three electron beams 14 projected from the in-line type electron gun 9 are arranged. (Only one is shown) is configured to reach the fluorescent film 5 through the shadow mask 6 after being deflected in a predetermined direction by the deflection yoke 8.

In this case, the operation of the color cathode ray tube having the above-mentioned structure, that is, the image display operation is the same as the image display operation of the known color cathode ray tube, and such display operation is already known. The description of the image display operation of the color cathode ray tube is omitted.

FIG. 3 is a sectional view showing a partial cross section of a color fluorescent film of a color cathode ray tube manufactured by the manufacturing method according to the present invention.

In FIG. 2, 15 is a black matrix, 16R is a red filter layer, 16G is a green filter layer, 16B is a blue filter layer, 17R is a red fluorescent substance layer,
17G is a green phosphor layer, 17B is a blue phosphor layer,
In addition, the same components as those shown in FIG. 1 are designated by the same reference numerals.

A color fluorescent film 5 is provided on the inner surface of the face plate 4 of the color cathode ray tube, and the color fluorescent film 5 is formed and arranged so as to be in contact with the inner surface of the face plate 4 at a predetermined interval. On the red filter layer 16R, the green filter layer 16G, the blue filter layer 16B, and the red filter layer 16R, which are alternately formed between the black matrices 15 so as to be in contact with the inner surface of the face plate 4. The red phosphor layer 17R provided on the green filter layer 16G, the green fluorescent layer 16G provided on the green filter layer 16G, and the blue fluorescent layer 16B provided on the blue filter layer 16B.
In this case, each black matrix 15 includes a red filter layer 16R, a green filter layer 16G, and a blue filter layer 16.
It has a laminated structure of B.

Next, FIGS. 3 (a) to 3 (e) and FIG. 4 (a)
5 (a) to 5 (e) and FIGS. 5 (a) to 5 (b) are partial configuration diagrams showing the steps of one embodiment of the method for manufacturing a color cathode ray tube according to the present invention.

3 (a) to 3 (e), 4 (a) to 4 (e), and 5 (a) and 5 (b), 19 is a photoresist film, and 19a is a photoresist exposure portion (for example, a dot). Pattern, hereinafter referred to as photoresist dot), 20 is a shadow mask, 21R is a red filter coating, 21G is a green filter coating, 21B is a blue filter coating, and other components are the same as those shown in FIGS. 1 and 2. The same symbols are attached to the components.

Here, FIGS. 3A to 3E and FIG.
(A) to (e) and FIGS. 5 (a) to (b), the method for manufacturing a color cathode ray tube according to the present invention, particularly the first method.
The steps of forming the filter layers of colors 3 to 3 and the step of forming the black matrix will be described.

First, a photoresist material, a red pigment particle suspension (slurry), a green pigment particle suspension, and a blue pigment particle suspension are prepared. In this case, as the photoresist material, for example, 1.5 wt% polyacrylamide diacetone acrylamide, 0.15 wt% azide S, 0.1 wt% solutol, 0.0
A silane coupling agent having a composition of 1% by weight and the balance being water is used.

Next, as shown in FIGS. 3A and 3B, fluorescence of the second color (for example, green) and the third color (for example, blue) on the inner surface of the face plate 4 of the color cathode ray tube. At the position where the body layer is arranged, exposure and development are performed using the photoresist material and the shadow mask 20 to form photoresist dots 19a.

Next, as shown in FIG. 3C, a suspension of red pigment particles of the first color (for example, red) is placed on the exposed inner surface of the face plate 4 and the photoresist dots 19a. It is applied on one surface to form a red filter coating 21R having a predetermined thickness.

Subsequently, the entire inner surface of the face plate 4 is treated with a stripping solution to swell and embrittle the photoresist dots 19a. As the stripping solution, for example, a composition containing 0.5% by weight of hydrogen peroxide solution, 0.05% by weight of amidosulfuric acid and the balance of water is used.

Next, as shown in FIG. 3 (d), the photoresist dots 19a and the red filter film 2 thereon are formed.
1R is developed by a hot pure water spray to remove the red filter film 21R in the exposed portion together with the photoresist dots 19a, and the red filter layer 16R is formed on the inner surface of the face plate 4. In this case, the formation positions of the red filter layer 16R are only the arrangement positions of the red phosphor layer and the black matrix 15.

Next, as shown in FIGS. 3 (e) and 4 (a), a third inner surface of the exposed face plate 4 is exposed.
The photoresist material and the shadow mask 20 are again placed at the arrangement position of the color (for example, blue) phosphor layer and the arrangement position of the first color (for example, red) phosphor layer on the red filter layer 16R. It is exposed and developed to form photoresist dots 19a.

Subsequently, as shown in FIG. 4B, the green pigment particle suspension is applied to one surface of the exposed inner surface of the face plate 4, the red filter layer 16R and the photoresist dots 19a. Then, the green filter film 21G having a predetermined thickness is formed.

Next, the entire inner surface of the face plate 4 is treated with a stripping solution to swell and embrittle the photoresist dots 19a.

Next, as shown in FIG. 4 (c), the photoresist dots 19a and the green filter film 21G thereon are developed by hot pure water spray to remove the green filter film 21G in the exposed portion together with the photoresist dots 19a. Thus, the green filter layer 16G is formed on the inner surface of the face plate 4. Also in this case, the green filter layer 16G is formed only at the green phosphor layer and black matrix 15 positions.

Subsequently, as shown in FIG. 4D, the arrangement position of the phosphor layer of the first color (for example, red) on the red filter layer 16R and the second color (on the green filter layer 16G). For example, the photoresist dots 19a are formed by exposing and developing the photoresist material and the shadow mask 20 three times at the arrangement position of the green phosphor layer.

Next, as shown in FIGS. 4 (e) and 5 (a), the exposed inner surface of the face plate 4, the red filter layer 16R, the green filter layer 16G and the photoresist dots 19a. The blue pigment particle suspension is applied on one surface to form a blue filter coating 21B having a predetermined thickness.

Next, the entire inner surface of the face plate 4 is treated with a stripping solution to swell and embrittle the photoresist dots 19a.

Finally, as shown in FIG. 5 (b), the photoresist dots 19a and the blue filter film 21B on the photoresist dots 19a are developed by a hot pure water spray, and the exposed portion of the blue filter film 21B is again exposed to the photoresist dots 19a. Face plate 4
The blue filter layer 16B is formed on the inner surface of the. Also in this case, the blue filter layer 16B is formed only at the arrangement positions of the blue phosphor layer and the black matrix 15. The red filter layer 16 thus obtained
R, green filter layer 16G, blue filter layer 16B
Looking at, each of the fluorescent layers having the corresponding color is separately formed, and the black matrix 15 is formed in a laminated manner.
The black matrix 15 is substantially formed by the laminated structure of the filter layers 16R, 16G, and 16B.

In this way, the black matrix 15 and the red filter layer 16R, the green filter layer 16G,
After the blue filter layer 16B is formed, the fluorescent layer of each color is formed by the same steps as the ordinary manufacturing steps of the fluorescent layer, and further, through the same steps as the manufacturing method of the color cathode ray tube. A high contrast color cathode ray tube is completed.

In the description of this embodiment, each suspension of pigment particles of the first color (for example, red), the second color (for example, green), and the third color (for example, blue) is formed. In this case, an example of forming each suspension containing only pigment particles is described. However, when forming a suspension of pigment particles of the first to third colors, each suspension A small amount of black fine particles, for example, graphite particles may be included in the above. In this case, the function of the black matrix 15 portion becomes clear, and the display screen becomes slightly black.

As described above, according to the method of manufacturing the color cathode ray tube of this embodiment, the number of steps for forming the black matrix 15 can be reduced as compared with the known method of manufacturing the color cathode ray tube of this type. The manufacturing process is simplified and the cost is reduced.

Further, according to the method of manufacturing the color cathode ray tube of the present embodiment, the first to third color fluorescent layers 17R, 17G and 17B as well as the first to third color layers are formed on the inner surface of the face plate 4. Since the three color filter layers 16R, 16G, and 16B are provided and the color fluorescent film 5 is configured, external light incident on the color fluorescent film 5 from the outside of the face plate 4 receives these filter layers 16R, 16G, and 16B. It is absorbed by 16G and 16B, and it is possible to obtain a high contrast characteristic having substantially the same performance as that of a known color filter of the micro-filter type.

Although the face plate dot pattern is formed at the arrangement position of the phosphor layer in the above embodiment, the present invention is not limited to this, and the face plate stripe pattern is formed. It goes without saying that the same can be applied to the case.

[0044]

As described above in detail, according to the present invention, first, the filter layer of the first color (for example, red) is formed, and then the filter layer of the second color (for example, green) is formed. When a filter layer is formed and subsequently a filter layer of a third color (for example, blue) is formed, a black matrix is formed on a portion where the black matrix is formed.
Since a black matrix having a laminated structure of the first color filter layer, the second color filter layer and the third color filter layer can be formed at the same time, it is required in a known micro-filter type color cathode ray tube. The black matrix forming process can be omitted,
The manufacturing process of the color cathode ray tube can be simplified, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an example of a configuration of a high-contrast color cathode ray tube including a color fluorescent film manufactured by a manufacturing method according to the present invention.

FIG. 2 is a cross sectional view showing a partial cross section of a color fluorescent film of a color cathode ray tube manufactured by a manufacturing method according to the present invention.

FIG. 3 is a partial configuration diagram showing a part of the process of one embodiment of the method of manufacturing a color cathode ray tube according to the present invention.

FIG. 4 is a partial configuration diagram showing another part of the process of the embodiment of the method of manufacturing the color cathode ray tube according to the present invention.

FIG. 5 is a partial configuration diagram showing a part of the rest of the steps of the embodiment of the method of manufacturing the color cathode ray tube according to the present invention.

FIG. 6 is a cross sectional view showing a cross section of a part of a fluorescent film of a known color filter of a micro filter type cathode ray tube.

[Explanation of symbols]

1 Panel Part 2 Funnel Part 3 Neck Part 4 Face Plate 5 Color Fluorescent Film 6 Shadow Mask 7 Mask Frame 8 Deflection Yoke 9 In-line Electron Gun 10 Purity Adjusting Magnet 11 Center Beam Static Convergence Adjusting Magnet 12 Side Beam Static Convergence Adjusting Magnet 13 Magnetic shield 14 Electron beam 15 Black matrix 16R Red filter layer 16G Green filter layer 16B Blue filter layer 17R Red fluorescent layer 17G Green fluorescent layer 17B Blue fluorescent layer 19 Photoresist coating 19a Photoresist exposed part ( For example, dot pattern) 20 Photomask 21R Red filter film 21G Green filter film 21B Blue filter film

Claims (2)

[Claims] 1. A step of forming a photoresist pattern on the inner surface of the face plate of the color cathode ray tube at the positions where the second and third color phosphor layers are arranged, and the inner surface of the face plate including the photoresist pattern. Applying a suspension of a pigment of the first color and forming a filter layer of the first color at the disposition position of the phosphor layer of the first color and the disposition position of the black matrix by a stripping solution treatment and development; A step of forming a photoresist pattern on the inner surface of the face plate where the first and third color phosphor layers are arranged; and a suspension of a second color pigment on the inner surface of the face plate including on the photoresist pattern. And forming a filter layer of the second color on the positions of the fluorescent layer of the second color and the positions of the black matrix by a stripping solution treatment and development. Forming a photoresist pattern at the positions where the first and second color phosphor layers are disposed on the inner surface of the plate; and applying a suspension of the third color pigment to the inner surface of the face plate including the photoresist pattern. The steps of applying, stripping solution treatment and development to form filter layers of the third color at the positions of arrangement of the phosphor layers of the third color and the positions of arrangement of the black matrix are carried out individually for the first to third colors. A method of manufacturing a high-contrast color cathode ray tube, characterized in that a black matrix composed of the filter layer and the laminated filter layers of the first to third colors is formed. 2. The method for producing a high-contrast color cathode ray tube according to claim 1, wherein the suspensions of the pigments of the first to third colors contain a small amount of black fine particles.