KR19990074643A - Cathode ray tube provided with the manufacturing method of the fluorescent membrane for cathode ray tubes, and the paste plate in which the fluorescent membrane manufactured by the method was formed. - Google Patents

Abstract

The present invention relates to a method for producing a fluorescent film for cathode ray tubes and a cathode ray tube having a paste plate on which a fluorescent film produced according to the method is formed. The method of manufacturing a cathode ray tube fluorescent film may include forming a first color filter layer by coating and drying an undercoat liquid and a first color filter liquid on an inner surface of a face plate; Coating and drying the composition including the first color phosphor on the resultant on which the first color filter layer is formed, and then exposing and developing the first color phosphor film; Applying and drying a protective resin film on the first color fluorescent film; Coating and drying the second color filter liquid on the resultant formed protective film, and then exposing the second color filter layer to form a second color filter layer; Coating and drying the composition including the second color phosphor on the resultant on which the second color filter layer is formed, and then exposing and developing the second color phosphor film; And applying and drying the third color phosphor having a fine size pigment on the resultant on which the second color phosphor film is formed, and then exposing and developing the third color phosphor. According to the present invention, the number of manufacturing process steps is drastically reduced compared to the filter screen method, and thus, a cathode ray tube having a very high brightness and contrast characteristics can be manufactured as well as a simple manufacturing process and a reduction in manufacturing cost.

Description

Cathode ray tube provided with the manufacturing method of the fluorescent membrane for cathode ray tubes, and the paste plate in which the fluorescent membrane manufactured by the method was formed.

The present invention relates to a method for producing a cathode ray tube fluorescent film and a cathode ray tube having a paste plate formed with a fluorescent film produced according to the method, in detail a method for producing a cathode ray tube fluorescent film excellent in brightness and contrast characteristics; A cathode ray tube comprising a face plate on which a fluorescent film produced according to the above method is formed.

As the current industrial society is advanced, high brightness and high definition of cathode ray tubes for displays are required. In order to meet these demands, efforts have been made to improve luminous intensity by electron beams and to reduce reflectance by external light.

Referring to Figure 1, look at the configuration of the fluorescent film of the conventional color cathode ray tube as follows.

On the inner surface of the face plate 11 of the color cathode ray tube, a black matrix 12 formed at regular intervals for absorbing external light, a fluorescent film 13a that emits streaked light by collision with an electron beam between the black matrix 12, (13b) and (13c) are formed.

As a method for preventing a decrease in reflectance of the fluorescent film itself formed on the inner surface of the face plate 11 and improving contrast and brightness, a method of coating a pigment having a fine size on the surface of the phosphor or a filter between the panel and the fluorescent film A filter screen method of forming a layer is used.

Among the above methods, the method of attaching the micro-sized pigment to the surface of the phosphor is easy to carry out, but the improvement of the characteristics is insignificant, and the adhesion strength of the fluorescent film is reduced during exposure.

On the other hand, the method of forming the filter layer is very distinctly improved characteristics such as contrast, brightness, but there is a problem that the manufacturing process is very complicated and the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method for manufacturing a cathode ray tube fluorescent film having excellent luminance and contrast characteristics at a low manufacturing cost in order to solve the above problems.

Another object of the present invention is to provide a cathode ray tube having a face plate on which the above-described fluorescent film is formed.

1 is a block diagram of a fluorescent film of a conventional color cathode ray tube,

2 and 3 are views showing the structure of the fluorescent film for cathode ray tube according to the present invention.

<Explanation of symbols for the main parts of the drawings>

11, 21 ... Face Plates 12, 22, 32 ... Black Matrix

13a, 23a, 33a ... First color fluorescent film 13b, 23b, 33b ... Second color fluorescent film

13c, 23c, 33c ... Third color fluorescent film 24a, 34a ... First color filter layer

24b ... second color filter layer

The first object of the present invention is to form a first color filter layer by (a) coating and drying the undercoat liquid and the first color filter liquid on the inner surface of the face plate (part); (b) applying and drying a composition including the first color phosphor on the resultant on which the first color filter layer is formed, and then exposing and developing the first color phosphor film; (c) applying and drying a protective resin film on the first color fluorescent film; (d) applying and drying a second color filter liquid on the resultant on which the protective resin film is formed, and then exposing to form a second color filter layer; (e) applying and drying a composition including a second color phosphor on the resultant on which the second color filter layer is formed, and then exposing and developing the second color phosphor film; And (f) applying and drying a third color phosphor having a fine-sized pigment on the resultant formed with the second color fluorescent film, and then exposing and developing the third color phosphor to form a third color fluorescent film. It is done by

The first object of the present invention also comprises the steps of: (a) coating and drying the undercoat liquid and the first color filter liquid on the inner surface of the face plate and then partially exposing the first color filter layer; (b) applying and drying a composition including the first color phosphor on the resultant on which the first color filter layer is formed, and then exposing and developing the first color phosphor film; (c) applying and drying a second-color phosphor having a micro-sized pigment on the first-color fluorescent film, followed by exposure and development to form a second-color fluorescent film; (d) coating and drying a third-color phosphor having a fine-sized pigment on the resultant on which the second-color fluorescent film is formed, and then exposing and developing the third color phosphor to form a third color fluorescent film. By the method.

The second object of the present invention is a face plate having an inner surface to which the cathode ray beam is irradiated; First, second and third color fluorescent films formed on the inner surface of the plate; And a first color filter layer and a second color filter layer formed between the inner surface of the plate and the first color fluorescent film, and between the inner surface of the plate and the second color fluorescent film, respectively. And a second color filter layer is selected from the group consisting of red (R) and blue (B) filter layers, respectively.

The second object of the present invention is also a face plate having an inner surface to which the cathode beam is irradiated; First, second and third color fluorescent films formed on the inner surface of the plate; And a first color filter layer formed between the inner surface of the plate and the first color fluorescent film, wherein the first color filter layer is a blue (B) filter layer.

In the present invention, when forming the first color and the second color fluorescent film, a filter layer having a corresponding color is formed on the lower portion thereof, and when forming the third color fluorescent film, a phosphor having a micro pigment is used. In the present invention, when the first color fluorescent film is formed, a first color filter layer is formed below the second color film, and when the second and third color fluorescent films are formed, a phosphor having a micro pigment is used.

Hereinafter, a method of manufacturing a fluorescent film according to the present invention will be described in detail with reference to FIGS. 2-3.

First, referring to FIG. 2, the undercoat liquid and the first color filter liquid are mixed, and then the composition is applied to the inner surface of the cathode ray tube face plate 21. After drying the resultant, a predetermined region is exposed to selectively form the first color filter layer 24a at the first color fluorescent film formation position. Thereafter, the first color phosphor is applied and dried, and the first color phosphor 23a is formed by exposing and developing the first color phosphor. Here, reference numeral 22 denotes a black matrix.

Subsequently, a protective resin film is applied on the first color fluorescent film 23a, and then a second color filter solution is applied and dried, and then a predetermined area is exposed, and then selectively formed on the second color fluorescent film formation position. The two-color filter layer 24b is formed. The protective resin film is generally formed of a composition such as a photocurable polymer, a dispersant, a solvent, a surfactant, and a pigment.

Thereafter, a second color phosphor is coated and dried on the second color filter layer 24b, and the second color phosphor 23b is formed by exposing and developing the second color phosphor.

Thereafter, a third color phosphor having a fine sized pigment attached thereto is coated and dried, and the third color phosphor 23c is exposed and developed to form a third color phosphor film 23c.

The first color filter layer and the second color filter layer are filter layers selected from the group consisting of red (R), green (G) and blue (B) filter layers, and among them, the filter layer selected from among the red (R) and blue (B) filter layers. It is preferable to use each.

Although the red, green, and blue phosphors can be used as the third color phosphor, it is most preferable to use the green phosphor. The reason is that under these conditions, the characteristics such as the brightness and contrast of the cathode ray tube screen are the most excellent.

Referring to FIG. 3, after the mixing of the primer and the first color filter solution, the composition is applied to the inner surface of the cathode ray tube face plate 31. After drying the resultant, a predetermined region is exposed to selectively form the first color filter layer 34a at the first color fluorescent film formation position. Thereafter, the first color phosphor is applied and dried, and the first color phosphor 33a is formed by exposing and developing the first color phosphor. Here, reference numeral 32 denotes a black matrix.

Subsequently, a second color phosphor having a micro-size pigment attached to the first color phosphor layer 33a is applied and dried, and the second color phosphor is exposed and developed to form a second color phosphor layer 33b.

A third color phosphor having a pigment having a fine size is coated and dried on the resultant on which the second color fluorescent film 33b is formed, and then exposed and developed to form a third color fluorescent film 33C.

It is preferable that the said 1st color filter layer is a blue (B) filter layer with a large reflectance fall effect and a brightness fall effect compared with green and red.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited only to the following Examples.

<Example 1>

First, 5% by weight of Fe ₂ O ₃ (Sakai chemical industry) is mixed with water, polyoxyethylene (20) sorbitan monolaurate (PES), sodium dichromate and polyvinyl alcohol. A filter liquid was prepared.

The red filter solution was applied to the inner surface of the cathode ray tube face plate and dried, and then a predetermined area was exposed to form a red filter layer.

Thereafter, the Y ₂ O ₂ S: Eu phosphor, which is a red phosphor, was applied and dried, which was then exposed and developed to form a red phosphor film.

Subsequently, a protective resin film was applied on the red fluorescent film, then a blue filter liquid was applied and dried, and then a predetermined area was exposed to form a blue filter layer. Herein, the blue filter liquid was prepared according to the same method as the red filter liquid except that Co-Al oxide (Asahi Co.) was used instead of Fe ₂ O ₃ as the pigment.

Thereafter, ZnS: Ag and Al, which are blue phosphors, were coated and dried on the resultant, which were then exposed and developed to form a blue phosphor film.

Subsequently, ZnS: Cu and Al, which are green phosphors having a fine green pigment attached thereto, were coated and dried on the resultant on which the blue fluorescent film was formed, and then exposed and developed to form a green fluorescent film.

<Example 2>

First, a green pigment Co oxide (kasei Kogyo Co.) was milled for a long time, and then 4.63 wt% was mixed with water, PES, sodium dichromate and polyvinyl alcohol as an adhesive to prepare a green filter liquid.

The green filter solution was applied to the inner surface of the cathode ray tube face plate and dried, and then a predetermined area was exposed to form a green filter layer.

Thereafter, ZnS: Cu and Al, which are green phosphors, were applied and dried, and then exposed and developed to form a green phosphor film.

Subsequently, a protective resin film was coated on the green fluorescent film, then a blue filter liquid was applied and dried, and then a predetermined area was exposed to form a blue filter layer. Herein, the blue filter liquid was prepared according to the same method as the red filter liquid except that Co-Al oxide (Asahi Co.) was used instead of Fe ₂ O ₃ as the pigment.

Then, ZnS: Ag and Al which are blue phosphors were apply | coated and dried, it was exposed and developed, and the blue fluorescent film was formed.

Subsequently, Y ₂ O ₂ S: Eu, which is a red phosphor having a fine red pigment attached thereto, was applied and dried, and exposed and developed to form a red fluorescent film.

<Example 3>

5 wt% Fe ₂ O ₃ (Sakai chemical industry) was mixed with water, PES, sodium dichromate and polyvinyl alcohol as an adhesive to prepare a red filter liquid.

The red filter solution was applied to the inner surface of the cathode ray tube face plate and dried, and then a predetermined area was exposed to form a red filter layer.

Thereafter, the Y ₂ O ₂ S: Eu phosphor, which is a red phosphor, was applied and dried, which was then exposed and developed to form a red phosphor film.

Subsequently, a protective resin film was applied on the red fluorescent film, then a green filter solution was applied and dried, and then a predetermined area was exposed to form a green filter layer. Here, the green filter liquid was prepared according to the same method as the red filter liquid except that Co oxide (kasei Kogyo Co.) was used instead of Fe ₂ O ₃ as the pigment.

Then, ZnS: Cu and Al which are green phosphors were apply | coated and dried, it was exposed and developed, and the blue fluorescent film was formed.

Subsequently, ZnS: Ag and Al, which are blue phosphors to which a micro pigment of blue pigment was attached, were applied and dried, and then exposed and developed to form a blue phosphor film.

<Example 4>

Co-blue, a blue pigment, was mixed with water, PES, sodium dichromate, and polyvinyl alcohol, an adhesive, to prepare a blue filter liquid.

The blue filter solution was applied to the inner surface of the cathode ray tube face plate and dried, and then a predetermined area was exposed to form a blue filter layer.

Thereafter, ZnS: Ag and Al, which are blue phosphors, were applied and dried, and then exposed and developed to form a blue phosphor film.

Subsequently, Y ₂ O ₂ S: Eu, which is a red phosphor having a micro-sized pigment attached to the blue phosphor, was applied and dried, and exposed and developed to form a red phosphor.

Subsequently, ZnS: Cu, Al, which are green phosphors having a fine-sized pigment, were applied and dried on the resultant formed with a red fluorescent film, and then exposed and developed to form a green fluorescent film.

Red, green and blue phosphors (Y ₂ O ₂ S: Eu, ZnS: Cu, Al, ZnS: Ag, Al) with fine pigments were mixed with water, polyvinyl alcohol, sodium dichromate and PES, respectively. The slurry was prepared by stirring for about 5 hours.

A green phosphor slurry was coated on the cathode ray tube panel, and then exposed and developed to form a green phosphor layer pattern.

The blue and red phosphor film patterns were repeated by using the blue phosphor slurry and the red phosphor slurry instead of the green phosphor slurry, respectively.

Red, green, and blue phosphor films were formed according to conventional phosphor slurry processes.

Comparative Example 2

Green, blue, and red fluorescent films were formed according to conventional green, blue, and red filter layer formation methods.

That is, the green filter solution was spun onto the cathode ray tube panel, dried, and then exposed and developed to form a green filter layer. Subsequently, the composition containing the green phosphor on the resultant product was spun on and dried, and then exposed and developed to form a green micro filter fluorescent film. Subsequently, a protective resin film was applied on the green fluorescent film.

Instead of the green filter liquid and the green phosphor, the above procedure was repeated using blue and red filter liquids and blue and red phosphors, respectively, to sequentially form blue and red micro filter phosphor films.

Comparative Example 3

Red, green and blue fluorescence according to a conventional method using a red phosphor Y ₂ O ₂ S: Eu, a green phosphor ZnS: Cu, Al, and a blue phosphor ZnS: Ag, Al with a fine pigment having a particle diameter of about 1 μm. A film was formed.

In the case of manufacturing according to Examples 1-3 and Comparative Examples 1-4, the brightness, color reproduction range and contrast characteristics of the cathode ray tube screen and the manufacturing process characteristics were examined and shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Luminance 117 120 115 117 107 125-130 100 Color reproduction range 104 104 104 104 103 105 100 Contrast 98 99 99 98 97 99 100 Process steps 38 38 38 34 34 46 ^a / 58 ^b 34 Remarks It is very difficult to form a red fluorescent film Significantly increased number of processes

a: When the filter layer and the fluorescent film are simultaneously exposed

b: When the filter layer and the fluorescent film are respectively exposed separately

From Table 1, it can be seen that the luminance, color reproduction range and contrast characteristics of the cathode ray tube having the fluorescent film prepared according to Example 1-4 are superior to those of Comparative Examples 1 and 3.

On the other hand, although the brightness, color gamut and contrast characteristics of the cathode ray tube screen manufactured according to the filter screen method according to Comparative Example 2 is the most excellent, as shown in Table 1, it is not only difficult to manufacture because of the significant increase in the number of processes. Manufacturing costs have risen.

In addition, when the fluorescent film was manufactured in accordance with Example 4, the luminance and other optical properties were greatly improved under the same conditions as in the prior art.

According to the present invention, the number of manufacturing process steps is drastically reduced compared to the filter screen method, and thus, a cathode ray tube having a very high brightness and contrast characteristics can be manufactured as well as a simple manufacturing process and a reduction in manufacturing cost.

Claims (10)

(a) applying and drying a primer and a first color filter liquid on an inner surface of a face plate and then partially exposing the first color filter layer; (b) applying and drying a composition including the first color phosphor on the resultant on which the first color filter layer is formed, and then exposing and developing the first color phosphor film; (c) applying and drying a protective resin film on the first color fluorescent film; (d) applying and drying a second color filter liquid on the resultant on which the protective resin film is formed, and then exposing to form a second color filter layer; (e) applying and drying a composition including a second color phosphor on the resultant on which the second color filter layer is formed, and then exposing and developing the second color phosphor film; And (f) coating and drying a third color phosphor with a fine-sized pigment on the resultant on which the second color fluorescent film is formed, and then exposing and developing the third color phosphor to form a third color fluorescent film. The method of claim 1, wherein the first color filter layer and the second color filter layer are selected from among red (R) and blue (B) filter layers, respectively. The method for manufacturing a cathode ray tube fluorescent film according to claim 1, wherein the third color phosphor is a green (G) phosphor. A face plate having an inner surface to which a cathode ray beam is irradiated; First, second and third color fluorescent films formed on the inner surface of the plate; And A cathode ray tube comprising: a first color filter layer and a second color filter layer formed between an inner surface of the plate and a first color fluorescent film and between the inner surface of the plate and a second color fluorescent film, respectively. And the first color filter layer and the second color filter layer are each selected from the group consisting of red (R) and blue (B) filter layers. The cathode ray tube according to claim 4, wherein the third color fluorescent film is made of a composition including a phosphor having a pigment having a micropig size. The cathode ray tube according to claim 5, wherein the phosphor having a pigment having a fine size is a green (G) phosphor. (a) applying and drying a primer and a first color filter liquid on an inner surface of a face plate and then partially exposing the first color filter layer; (b) applying and drying a composition including the first color phosphor on the resultant on which the first color filter layer is formed, and then exposing and developing the first color phosphor film; (c) applying and drying a second-color phosphor having a micro-sized pigment on the first-color fluorescent film, followed by exposure and development to form a second-color fluorescent film; And (d) coating and drying a third-color phosphor having a fine-sized pigment on the resultant on which the second-color fluorescent film is formed, and then exposing and developing the third color phosphor to form a third color fluorescent film. Way. The method of manufacturing a fluorescent film for cathode ray tube according to claim 7, wherein the first color filter layer is a blue filter layer. A face plate having an inner surface to which a cathode ray beam is irradiated; First, second and third color fluorescent films formed on the inner surface of the plate; And A cathode ray tube comprising: a first color filter layer formed between an inner surface of the plate and a first color fluorescent film; A cathode ray tube, wherein the first color filter layer is a blue (B) filter layer. 10. The cathode ray tube according to claim 9, wherein the second color fluorescent film and the third color fluorescent film are each composed of a composition including a phosphor having a pigment having a micropig size.