JPS5916245A - Manufacturing method of luminous screen for color picture tube - Google Patents

Abstract

PURPOSE:To remove both drying and development processes and simplify the manufacturing process of a luminous screen by leaving behind a photosensitive section as a latent image. CONSTITUTION:After a photoresist is applied, dried, and exposed, a luminous picture element is formed from on it while its development is being removed. Therefore, a phosphor slurry 8 with preset colors is applied while the photoresist 7 is being left behind over the whole inner surface. However, the exposed section 6 of the photoresist remains as a latent image. In addition, the non-exposed section 7 is removed simultaneously with a phosphor slurry coat in the development process of the luminous picture element. As a result, since the drying process 302 of the photoresist and its exposure process 304 can be removed, the manufacturing process of a luminous screen can remarkably be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a luminescent screen M for a color picture tube, in which two or more types of luminescent pixels are formed at one end of a color selection electrode. Gong is commercial red, blue,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating, in order of steps, a method of manufacturing a luminescent screen using a conventional photographic printing method for a color picture tube equipped with three types of green luminescent picture elements 7.

In the figure, (101) is a water washing process, (102) r
I drying process, (103) green phosphor nulla + J g cloth process, (104) t'! Drying step, (105) t! Exposure process, (106) RC development process, (107) drying process, (10g) blue phosphor slurry coating process, (1
097 rX drying process, (110) rJ, n light process, (1
11) $1! Development process, (112) FIX drying process, (113) H red phosphor slurry coating process, (11
4) is a drying process, (115) is an exposure process, (116)
if development process, (117) li drying process, (11g)
I'X lacquer application process, (1193i drying process, (1
2G) This is the rX inspection process, where (B!l;) is a blue phosphor slurry, (GS) is a green phosphor slurry, and (R
8) Filming lacquer on rc red phosphor slurry (FL).

By the way, recently, in response to the demand for clearer images, as shown in FIG. R's drunkenness [1'! +1 interval, that is, the screen pitch P, tends to decrease from about 0.6 mIn in reverse to 0.4 mIn and 0.2 mm. 21 is missing, so the number 3 is not shown in Figure 1.
Conventional method (photosensitive resist) (SR) complete coating step (301), same drying step (302), exposure step (30
3), this problem was completely prevented by adding a developing step (304). However, since the number of steps is very large, it takes a long time to manufacture the luminescent screen, which is very disadvantageous from an industrial perspective.

This invention has been made to remove the upper ml defects, and provides a novel luminescent screen manufacturing method that can simplify the luminescent screen manufacturing process.

This invention was discovered as a result of various experiments, and in the conventional method, the photosensitive portion of the photosensitive resist is removed before the formation of the light emitting picture element. The entire latent image was exposed during the development process, but
In the present invention, by leaving the photosensitive area as a latent image, both drying and developing steps are completely omitted. This will be explained below using the block diagram shown in FIG. In the same figure, the same place VC as in Figure 3 is shown.
r1. Same code? 0″t, whose explanation is omitted, that is,
A feature of this invention is that a photosensitive resist is applied, dried, exposed, and then developed. The purpose is to form light-emitting picture elements on top of this, leaving it omitted. Therefore, in the conventional method, a phosphor slurry of a predetermined color (4) is applied to the photosensitive portion (6) of the photosensitive resist provided on the screen (4) in step 9 of FIG.
8) is coated, but in the case of the present invention, the photosensitive resist (7) remains on the entire inner surface as shown in factor 6.
A phosphor slurry (8) of a predetermined color is applied.However, the exposed portion (6) of the photosensitive resist becomes a latent image, and the unexposed portion (7) is coated with a luminescent pixel. The phosphor slurry film is removed at the same time during the development process. Therefore, compared to conventional methods, the photosensitive resist drying process (302) and exposure process (304) can be omitted, and the light emission The advantage is that the screen manufacturing process is significantly simplified. EXAMPLE 1 A striped luminescent screen with a screen pitch of 4 of 0.2 mm will be described in more detail in the Examples below. In the case of production/8, before forming each luminescent pixel with a width of 0.06 mm, a water-soluble photosensitive resist solution containing 1% by weight of polyvinyl alcohol and 0.2% by weight of ammonium dichromate was applied to the whole film panel (4). The excess photosensitive resist 7 is completely removed and temporarily dried.Then, a shadow mask is attached and the area where each light-emitting pixel is to be formed is set from the predetermined original position. A1 image of luminescent picture elements was formed in this area. Next, the shadow mask was removed, a green phosphor slurry was applied without development, and green light-emitting pixels were formed using a known photographic printing method. By repeating these operations on the red and white luminescent pixels, the luminescent screen of the desired color picture tube could be completed without any problems, and there was no difference at all from the conventional method.Example 2〉0 , direct diameter 0.2n with a screen pitch of 3 mm
5. In the production of luminescent screens, before the formation of green luminescent pixels, 2M amount % of polyvinyl alcohol is mixed with 0.2% weight of sodium. Photoresist liquid? Face panel (4
), remove excess photosensitive resist and remove it.
')+The green luminescent picture element forms from the position of the foot) and the green luminescent pixel forms & the amber stone is placed at the position of the foot. Apply the body slurry (G5) and make a differential image 7, then apply a shadow mask and take a quick look
PJ the position where the green light-emitting pixel should be formed from the X source position.
Exposure was performed at a fixed nine-degree angle, the shadow mask was removed, and the green light-emitting pixels were completely formed.

This d% blue and red color pattern is formed.1. 17)ri
- There was no need to remove it at the beginning, and it did not interfere with the subsequent process at all.

Incidentally, although the above description has been made of a light-emitting screen composed of μ-stripe-shaped and circular light-emitting pixels, the present invention is not limited to these, and other shapes of light-emitting pixels can also be used. It is also possible to confirm the presence of a pigment by mixing a pigment with a fluorophore in the photosensitive resist solution. only'! 'C may be applied or it may be applied to light-emitting picture elements of 1 or rJ2 or more.

According to the method VC for producing a luminescent screen of the present invention, compared to the conventional process, the drying process per luminescent picture element and the present Ω process are omitted, and the luminescent screen production process is greatly increased. ] Because of his short disappearance, he has been valued as an engineering department.

[Brief explanation of drawings]

A block diagram showing the manufacturing method of the luminescent screen of the color picture tube of I1 District IV Yutonghan in the order of steps, Figure 2 is a partial enlarged view of the luminescent screen that is produced from the striped picture to #F), and Figure 3 is the same. Conventional color tube luminescent screen It
Fig. 4 is a block diagram showing an example of the manufacturing method of the luminescent screen for a color picture tube according to the present invention in the order of steps; Fig. 5 is a partially enlarged view of the luminescent screen in the conventional method; Figure 6 shows the method of the present invention, which shows the enlarged section of the gIS portion of the original screen. part,(
8) is the phosphor slurry, (101) is the water washing process, (10
3) green phosphor slurry coating step, (104) (10
9) (114) (117) (119) (302) is a drying process, (105) (110) (115) (303) is a
Original process, (106) (111) (116) developable process,
(108) 1 corner-chromatic body nullary wing cloth process, (11
3) FX red phosphor rally coating process, (118)r
J Lacquer application process, (120) f[Inspection process, (3
01) i Photosensitive resist coating process, (mQ Laschau mask, (GS) Iff green fluorescent body slurry, CBS)
is a blue fluorescent slurry, (SR) is a photosensitive resist, (P
L) H Filming lacquer 〇In addition, in the drawings, the same reference numerals indicate the same or corresponding parts〇Representative Makoto Kuzuno -

Claims (1)

[Claims] Before the formation of at least one type of luminescent picture element in the color picture tube luminescent screen, is there a photosensitive resist? A method for manufacturing a luminescent screen for a color picture tube, characterized in that the luminescent picture elements are formed by coating, and the luminescent picture elements are formed by exposing only the desired positions to form a latent image of the luminescent picture elements, and then a luminescent picture is formed on top of the latent image. .