KR100209649B1 - Screen manufacturing method of color crt - Google Patents

Abstract

The present invention relates to a color cathode ray tube of the present invention, and more particularly, to a method for manufacturing a screen of a color cathode ray tube adapted to simplify a process of forming a black matrix formed on an inner surface of a panel of a color cathode ray tube.

That is, the screen manufacturing method with the color cathode ray of the present invention is a step of forming the first, second, and third fluorescent film at regular intervals on the cleaned panel, and applying a non-luminescent material to the inner surface of the panel on which the photosensitive film pattern is formed. And a step of forming a black matrix pattern between the first, second, and third fluorescent films.

Description

Screen manufacturing method of color cathode ray tube

Figure 1 (a) is a longitudinal sectional view showing a general flat color cathode ray tube.

(b) is sectional drawing which expanded part A of (a).

(A)-(g) is sectional drawing of the 1st Example which shows the screen manufacturing method of the conventional color cathode ray tube.

Figure 3 (a)-(d) is a cross-sectional view of a second embodiment showing a screen manufacturing method of a conventional color cathode ray tube.

(A)-(g) is process sectional drawing which showed the screen manufacturing method of the color cathode ray tube of this invention.

* Explanation of symbols for main parts of the drawings

51 panel 52 green fluorescent film

53: green fluorescent film pattern ruler 54: blue fluorescent film pattern

55 red fluorescent film pattern 56 photosensitive film

57: photosensitive film pattern 58; Graphite film

59: etching liquid 60: black metric pattern

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to color cathode ray tubes, and more particularly, to a method for producing a screen of color cathode ray tubes adapted to simplify the process of forming a black matrix formed on an inner surface of a panel of color cathode ray tubes.

In general, in the color cathode ray tube, the fluorescent surface serves to deliver a color image, which is the ultimate purpose of the color cathode ray tube, to the human vision.

The fluorescent surface is graphite (light absorbing material of red, green, and blue (B) phosphor pixels having three primary emission spectrums of light, which is an all-optical device that converts image information received as an electric signal into visual information). Graphite is applied separately to the inner surface of the panel.

Such a process of forming the fluorescent surface includes a panel cleaning process for cleaning the inner surface of the panel, a BM (Black Matrix) forming process with a predetermined pattern on the inner surface of the panel, and a red, green, and blue phosphor layer formed between the BMs. The phosphor layer forming process is included.

1 (a) and (b) are longitudinal cross-sections showing a general colored cathode ray tube.

As shown in FIG. 1, a fluorescent pattern 9 having a predetermined pattern is formed on an inner surface of the panel 1 in a planar state, and a rail 7 integrated in a rectangular shape is fixed to an inner side of the panel 1. It is.

The rail 7 has a shadow mask 8 in which a number of beam passing holes 8a are drilled so as to pass a part of the electron beam emitted from the electron gun 4, and is spaced apart from the fluorescent surface 9 by a predetermined distance. It is spaced apart and fixed.

A panel 3 having a neck part 2 is integrated behind the panel 1 to form an external shape of a bulb form, and the neck part 2 includes a panel 1. The electron gun 4 is built in so as to emit red, green and blue three-color electron beams.

On the outer circumferential surface of the neck portion 2 of the panel 3, a deflection yoke 5 is provided to deflect the electron beam emitted from the electron gun 4 in the horizontal and vertical directions, and on the outer side of the panel 1 an explosion-proof Explosion-proof glass 6 is attached to prevent danger.

In addition, the electron beam emitted by the electron gun 4 is not accurately landed on each of the red, green, and blue fluorescent surfaces formed in a predetermined pattern, and emits another color adjacent to the panel to prevent color blurring and to improve contrast. A black matrix 10 made of graphite, which is a non-luminescent absorbent material, is interposed between each of the fluorescent surfaces R, G, and B of the fluorescent surface 9 formed on the inner surface of (1).

Hereinafter, a method of manufacturing a conventional color cathode ray tube screen will be described with reference to FIG. 2.

The screen manufacturing method of the conventional color cathode ray tube was formed in the order shown in FIG. 2 in order to form the screen part which consists of the black matrix 10 and the fluorescent surface 9. As shown in FIG.

2 (a)-(g) are process cross-sectional views of a first embodiment showing a screen manufacturing method of a conventional color cathode ray tube.

First, the photoresist is applied onto the panel 11 washed with washing water as shown in FIG. 2 (a), followed by drying to form a photoresist film 12, and as shown in FIG. The photosensitive film pattern 13 on the stripe having a rectangular shape is formed by the exposure and development processes on the stripe arranged in parallel.

Subsequently, as shown in FIG. 2C, graphite 14 for forming a black matrix pattern to be formed in a later step is coated on the photoresist pattern 13 and the panel 11, and the graphite 14 is formed on the photoresist 14. The etching solution 15 is poured into the liquid.

Next, as illustrated in FIG. 2D, the rectangular black matrix pattern 16 is formed by removing the photoresist pattern 13 formed by being exposed to the etching solution 15.

Next, as shown in FIG. 2E, the green phosphor slurry 17 is coated on the inner surface of the panel 11 on which the black matrix pattern 16 is formed.

Then, as shown in FIG. 2 (f), the green phosphor slurry 17 is irradiated with ultraviolet rays to form a green phosphor layer pattern 18 through an exposure and development process.

Subsequently, the blue and red phosphors (not shown) are operated in the same order, and the desired green (18) and blue (19) are formed between the black matrix patterns 16 as shown in FIG. A red (20) fluorescent film pattern is obtained, and a screen is formed.

However, in the conventional method of manufacturing a color cathode ray tube screen, the black matrix pattern interposed between the fluorescent film patterns has a rectangular cross section, so that the pixel width is increased in accordance with the trend of the cathode ray tube requiring more and more clear picture quality. As it gets smaller, the width of the black matrix is getting smaller.

As a result, the landing margin in which the electron beam spurted from the electron gun lands on each of the fluorescent film patterns decreases, and color blurring occurs by emitting light of adjacent colors, thereby degrading image quality.

Another embodiment of the present invention for solving such a problem will be described with reference to the accompanying drawings.

3 (a)-(d) are process cross-sectional views of a second embodiment showing a screen manufacturing method of a color cathode ray tube of another embodiment.

First, the photoresist is applied to the inner surface of the cleaned panel 31 as shown in FIG. 3 (a), followed by drying to form the photoresist film 32.

Subsequently, as illustrated in FIG. 3B, light is irradiated onto the photosensitive film 32 to form the photosensitive film pattern 33 on the stripe arranged in parallel with each other by exposure and development.

At this time, the exposure of the photosensitive film 32 is a cross-section of the photosensitive film pattern 33 cured by irradiating light in a direction inclined at a predetermined angle with respect to the electron beam through hole of the mask (not shown) from both sides using a light source. It is formed to have an approximately trapezoidal shape.

Next, as shown in FIG. 3C, graphite 34 for forming a black matrix is coated on the inner surface of the panel 31 on which the photoresist pattern 33 is formed.

Then, as shown in FIG. 3 (d), the cross-sectional trapezoidal photosensitive film pattern 33 is removed to form the cross-section inverted trapezoidal black matrix pattern 35.

Although not shown in the drawing, the subsequent process is that when the black matrix pattern 35 is formed on the inner surface of the panel 31 as described above, a desired fluorescent film is applied between the black matrix patterns 35 in a subsequent process to screen the color cathode ray tube. To form.

However, the screen manufacturing method of such a color cathode ray tube has a problem that there is a significant difficulty in exposing the trapezoidal shape black matrix (BM).

An object of the present invention is to provide a method for manufacturing a color cathode ray tube suitable for simplifying the process of forming a black matrix by first performing a process of forming a fluorescent film.

The screen manufacturing method of the color cathode ray tube of the present invention for achieving the above object is a step of forming the first, second, third fluorescent film at regular intervals on the cleaned panel, and on the inner surface of the panel on which the photosensitive film pattern is formed And a process of coating a non-luminescent material and forming a black matrix pattern between the first, second, and third fluorescent films.

Hereinafter, a screen manufacturing method of the color cathode ray tube of the present invention with reference to the accompanying drawings in detail as follows.

4 (a)-(g) are process cross-sectional views showing a screen manufacturing method of the color cathode ray tube of the present invention.

First, as shown in FIG. 4 (a), the green phosphor slurry is coated and dried on the panel 51 washed with washing water to form a green phosphor film 52.

Subsequently, as shown in FIG. 4B, the green fluorescent film 52 has a predetermined width in an exposure and development process using ultraviolet rays, and the green fluorescent film pattern 53 in the shape of a garden due to the interference of light in the exposure process. ) Is formed on the inner surface of the panel 51.

Next, as shown in FIG. 4C, the blue phosphor layer pattern 54 and the red phosphor layer pattern 55 are also formed in the same manner as the green phosphor layer pattern 53.

Subsequently, as illustrated in FIG. 4 (d), the photoresist film 56 is coated on each of the fluorescent film patterns 53, 54, and 55 and the entire surface of the panel 51.

Subsequently, as illustrated in FIG. 4E, the photosensitive film pattern 57 is formed to remain only on each of the fluorescent film patterns 53, 54, and 55 by an exposure and development process using ultraviolet rays.

Next, as shown in FIG. 4 (f), a graphite film 58, which is a non-light-emitting material, is formed on the photoresist film pattern 57 and the front surface of the panel 51, and an etching solution (for example) is formed on the graphite film 58. 59).

Next, as illustrated in FIG. 4G, the photoresist layer pattern 57 is etched to form a black matrix pattern 60 interposed between the respective phosphor layer patterns 53, 54, and 55.

At this time, since the black matrix pattern 60 is formed along the shape of each of the phosphor-shaped fluorescent film patterns 53, 54, and 55, the width of the black matrix pattern 60 viewed from the inside of the panel 51 is viewed from the front of the panel 51. The black matrix pattern 60 is formed to be larger than the width of the black matrix pattern 60.

As described above, the screen manufacturing method of the color cathode ray tube according to the present invention forms a black matrix pattern after forming the fluorescent film, thereby simplifying the manufacturing process.

Claims (4)

Forming a first, second, and third fluorescent film at regular intervals on the cleaned panel; applying a non-luminescent material to the inner surface of the panel on which the photosensitive film pattern is formed; and the first, second, and third The method for manufacturing a color cathode ray tube, characterized in that the step of forming a black matrix pattern between the fluorescent film is performed sequentially. The method of claim 1, wherein the forming of the black matrix pattern comprises: forming a photoresist pattern on the first, second, and third fluorescent films; depositing a black matrix material on the entire surface; And etching the black matrix material to expose the surface, and removing the photoresist pattern. The method of claim 2, wherein the black matrix material uses graphite. The method of claim 1, wherein the black matrix pattern has a larger surface than a surface in contact with the pann.