KR100277635B1 - Cathode ray tube provided with the manufacturing method of the fluorescent membrane for cathode ray tubes, and the face 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 face plate on which a fluorescent film produced according to the method is formed. The method of manufacturing the fluorescent film may include applying and drying an undercoat liquid and a filter liquid on an inner surface of a paste plate and then partially exposing to form a first color and a second color filter layer; Coating and drying a composition including a first color phosphor on the resultant filter layer formed thereon, and then exposing and developing the first color phosphor film; Coating and drying the composition including the second color phosphor on the resultant product on which the first color fluorescent film and the filter layer are formed, and then exposing and developing the second color fluorescent 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 steps can be drastically reduced compared to the filter screen method, so that the manufacturing cost can be greatly reduced, and a cathode ray tube having excellent brightness and contrast characteristics can be manufactured.

Description

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

The present invention relates to a cathode ray tube having a method for producing a cathode ray tube fluorescent film and a face plate formed with a fluorescent film manufactured according to the method, and more specifically, to obtain a compact fluorescent film without additional steps to the existing process. The present invention relates to a cathode ray tube excellent in contrast and luminance characteristics by being produced according to the production method and the method.

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 face plate and the fluorescent film ( A filter screen method for forming a filter 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 characteristics of the cathode ray tube screen are 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.

The technical problem to be achieved by the present invention is to provide a method for producing a compact fluorescent film without additional steps compared to the existing process.

Another object of the present invention is to provide a cathode ray tube having excellent contrast and brightness characteristics of a screen by having a face plate having a fluorescent film manufactured according to the above method.

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

2 is a view showing the structure of a fluorescent film of a cathode ray tube according to the present invention,

3 is a view showing a change in transmittance of each filter according to the wavelength.

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

11, 21 ... face plate 12, 22 ... black matrix

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

13c, 23c ... Third Color Fluorescent Film 24 ... First Color and Second Color Filter Layer

The first technical problem of the present invention is the step of (a) applying and drying the coat and the filter liquid on the inner surface of the paste plate, and partially exposed to form a first color and a second color filter layer; (b) applying and drying a composition including a first color phosphor on the resultant filter layer formed thereon, and then exposing and developing the first color phosphor film; (c) applying and drying a composition including a second color phosphor on the resultant product on which the first color phosphor film and the filter layer are formed, and then exposing and developing the second color phosphor film; And (d) applying 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. .

The second technical problem 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 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. The color and second color filter layer is made of a cathode ray tube, characterized in that it is made of a composition containing a mixed pigment of green (G) and blue (B).

The second technical problem of the present invention is also 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 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. The color and second color filter layer is made of a cathode ray tube, characterized in that it is made of a composition containing a mixed pigment of green (G) and red (R).

The third color fluorescent film may be formed of a phosphor having a pigment having a fine size, although a conventional phosphor may be used.

The second technical problem of the present invention is also 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 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. The cathode ray tube, characterized in that the color and the second color filter layer is made of a composition containing a mixed pigment of blue (B) and red (R), and the third color fluorescent film is made of a green (G) phosphor with a micro pigment. By providing.

Hereinafter, referring to FIG. 2, a method of manufacturing a cathode ray tube fluorescent film according to an exemplary embodiment of the present invention will be described.

First, the filter liquid containing the undercoat liquid and the mixed pigment of a 1st color (green) and a 2nd color (blue) is apply | coated to the paste plate 21 of the clean cathode ray tube, and it dries. Subsequently, this is partially exposed to form a green and blue filter layer 24 at the first and second color fluorescent film formation positions. Then, the composition including the green phosphor is applied and dried on the resultant product in which the green and blue filter layers 24 are formed, and then exposed and developed to form the green fluorescent film 23a.

Subsequently, a composition containing a blue phosphor is applied and dried on the resultant on which the green fluorescent film 23a is formed, and then exposed and developed to form a blue fluorescent film 23b.

Thereafter, the red phosphor having a micropigment is applied and dried, and then exposed and developed to form a red phosphor film 23c. Here, reference numeral 22 denotes a black matrix.

In the above-mentioned manufacturing method, instead of using green and blue as the first color and the second color, green and red or red and blue may be used depending on the required characteristics of the cathode ray tube. In the case where each mixed pigment is used, the transmittance characteristic of the filter layer according to the wavelength of light is shown in FIG. 3.

In this case, as the third color phosphor, a conventional phosphor may be used, but it is preferable to use a phosphor having a pigment having a fine size.

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>

A cobalt violet pigment, which absorbs light in the red and blue regions, was mixed with PES, sodium dichromate and polyvinyl alcohol to prepare a red and blue filter liquid.

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

Then, a composition containing a blue phosphor, ZnS: Ag, Al, was applied and dried on the resultant on which the red and blue filter layers were formed, followed by exposure and development to form a blue fluorescent film.

Subsequently, a composition containing a Y ₂ O ₂ S: Eu phosphor, which is a red phosphor, was applied and dried on a blue phosphor film and a resultant product having a red cum blue filter layer, and then exposed and developed to form a red phosphor film.

Thereafter, the green phosphors ZnS: Cu and Al with fine pigments attached to the resultant were applied and dried, and then exposed and developed to form a green fluorescent film.

Comparative Example 1

Red, green and blue phosphors (Y ₂ O ₂ S: Eu, ZnS: Cu, Al, ZnS: Ag, Al) with fine pigments were respectively dissolved in water, polyvinyl alcohol, sodium dichromate, and polyoxyethylene (20). Carbon monolaurate (polyoxyethylene (20) sorbitan monolaurate: PES) and then mixed for about 5 hours to prepare a phosphor slurry.

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 the above Examples and Comparative Examples 1-3, the brightness, color gamut and contrast characteristics of the cathode ray tube screen and the manufacturing process characteristics were examined and shown in Table 1 below.

division Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Luminance 115 107 125-130 100 Color reproduction range 102 103 105 100 Contrast 99 97 99 100 Process steps 34 34 46 ^a / 58 ^b 34 Remarks Very difficult to form 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 brightness, color gamut and contrast characteristics of the cathode ray tube having the fluorescent film prepared according to the Example are superior to those of Comparative Examples 1 and 3.

On the other hand, in the cathode ray tube manufactured according to the filter screen method of Comparative Example 2, the brightness, color gamut and contrast characteristics are the most excellent, but as can be seen in Table 1, the number of steps is greatly increased and it is very difficult to manufacture. Instead, manufacturing costs have risen.

According to the present invention, the number of manufacturing steps can be drastically reduced compared to the filter screen method, so that the manufacturing cost can be greatly reduced, and a cathode ray tube having excellent brightness and contrast characteristics can be manufactured.

Claims (8)

(a) applying and drying the primer and filter liquid on the inner surface of the paste plate, followed by partial exposure to form a first color and a second color filter layer; (b) applying and drying a composition including a first color phosphor on the resultant filter layer formed thereon, and then exposing and developing the first color phosphor film; (c) applying and drying a composition including a second color phosphor on the resultant product on which the first color phosphor film and the filter layer are formed, and then exposing and developing the second color phosphor film; And (d) applying 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. The method for producing a fluorescent film for cathode ray tubes according to claim 1, wherein the filter liquid contains a mixed pigment of green (G) and blue (B). The method of manufacturing a fluorescent film for cathode ray tube according to claim 1, wherein the filter liquid contains a mixed pigment of green (G) and red (R). 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 and a second color filter layer formed between an inner surface of the plate and a first color fluorescent film and between an inner surface of the plate and a second color fluorescent film, respectively. The cathode ray tube, wherein the first color and the second color filter layer are made of a composition containing a mixed pigment of green (G) and blue (B). The cathode ray tube according to claim 4, wherein the third color fluorescent film is made of a red pigment (R) phosphor with a micropigment. 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 and a second color filter layer formed between an inner surface of the plate and a first color fluorescent film and between an inner surface of the plate and a second color fluorescent film, respectively. The cathode ray tube, wherein the first color and the second color filter layer are made of a composition containing a mixed pigment of green (G) and red (R). The cathode ray tube according to claim 6, wherein the third color fluorescent film is made of a blue (B) phosphor with a micro pigment. 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 and a second color filter layer formed between an inner surface of the plate and a first color fluorescent film and between an inner surface of the plate and a second color fluorescent film, respectively. The first color and the second color filter layer is made of a composition containing a mixed pigment of blue (B) and red (R), And said third color fluorescent film comprises a green (G) phosphor with a micro pigment.