JPH0536354A - Photosensitive composition material for forming fluorescent screen - Google Patents

Abstract

PURPOSE:To form a fluorescent screen without using developing water by forming it with an alkali-soluble compound mainly made of condensed resin with a specific composition and a compound indicated by a specific formula. CONSTITUTION:A photosensitive composition material is formed with an alkali- soluble compound mainly made of rosins or condensed resin of toluene sulfone amide and formaldehyde and a compound indicated by a specific formula. Phosphors are stuck on the exposure face to form a fluorescent screen, thus the fluorescent screen is formed by the dry process without using harmful chromium. A single grain layer of phosphors can be uniformly formed, and no developing water is required because of the dry process. In the formula, R1 indicates H or the alkyl group, R2 indicates the alkyl group, and (n) indicates 1 or 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive composition for forming a fluorescent screen of a color display panel.

[0002]

2. Description of the Related Art A slurry liquid containing polyvinyl alcohol, dichromate, water and a phosphor is generally used for a photosensitive composition for forming a phosphor screen such as a color cathode ray tube. For example, sodium dichromate, potassium dichromate, ammonium dichromate, etc. are used as the dichromate in the conventional phosphor screen formation disclosed in JP-A-1-272029. The conventional fluorescent screen formation is a negative photosensitive material in which the slurry liquid is applied and dried, exposed, and developed with pure water. Therefore, the exposed portion remains after washing with water to form a fluorescent screen.

[0003]

Since the conventional phosphor screen formation has been performed as described above, a large amount of water is required for development and a special facility for treating chromium, which is a pollutant, must be provided. There was a problem such as not becoming.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to form a phosphor screen without using chromium and without using water for development. The purpose is to obtain a composition for use.

[0005]

A photosensitive composition for forming a fluorescent screen according to the present invention comprises an alkali-soluble compound containing a condensation resin of rosin or toluenesulfonamide and formaldehyde as a main component, and a compound represented by the general formula: A negative photosensitive composition (hereinafter referred to as PTR) containing at least one compound represented by Chemical formula 2 is used.

[0006]

The photosensitive composition for forming a fluorescent screen according to the present invention forms a fluorescent screen by adhering a fluorescent substance to the exposed surface by utilizing the fact that the dried coating film of PTR exhibits tackiness by exposure to light. Since this PTR forms a phosphor screen by a dry process without requiring harmful chrome, a single particle layer of phosphor can be uniformly formed. Further, since it is a dry process, water for development is not required.

[0007]

EXAMPLES The photosensitive composition (PTR) for forming a fluorescent screen of the present invention will be described below. This PTR is composed of an alkali-soluble compound containing a condensable resin of rosin or toluenesulfonamide and formaldehyde as a main component, and at least one of the photosensitive compounds represented by the general formulas (1) and (2). Sex compounds are Japanese Patent Publication 1
The 4- (2'-nitrophenyl) -1,4-dihydropyridines described in JP-A-533771 are used. That is, in the present invention, when the PTR is exposed to light, the 4- (2'-nitrophenyl) -1,
The phosphor is coated by utilizing the fact that the glass transition point of the photosensitive composition is lowered by the structural change of 4-dihydropyridines to 4- (2'-nitrosophenyl) -pyridines, resulting in adhesion. is there.

[0008]

[Chemical 1]

[0009]

[Chemical 2]

The object to which this PTR is applied is, for example, that of a surface plate in a color display panel utilizing gas discharge, which has a plurality of display cell spaces between a surface plate and a back plate arranged in parallel and opposite to each other. This is the formation of the phosphor screen.

In FIG. 1, reference numeral 1 is a coating for forming a coating film by blowing warm air while rotating a PTR on a surface plate using, for example, a whaler, and 2 is a subsequent drying step in a drying oven. The coating step and the drying step 2 constitute a coating step (first step).
The thickness of the dry film obtained by this coating process is 0.5.
The coating amount is adjusted so as to be ˜3 μm. 3 is the alignment of the mask so that the opening of the mask is located at the position where the phosphor is applied to this dry film, and 4 is the exposure by the ultra-high pressure mercury lamp. In the step (second step), 5 is a phosphor coating step (third step) in which the phosphor is sprayed over the entire surface after exposure, and then lightly tapped with absorbent cotton (3rd step), and 6 is an extra phosphor. The unnecessary fluorescent substance removing step (fourth step) is performed by blowing away the powder with an air spray or the like.

In the second, third and fourth steps, first the phosphor of the first color is applied, and then, the phosphor of the second color is applied. Steps 3 and 4 are repeated. There are three colors of phosphor, red, green and blue, and the above steps are repeated three times. The order in which the phosphors are attached is not limited to any order.

Next, the phosphor screen thus obtained will be described. An enlarged photograph of this phosphor screen is shown in FIG. 2 and its cross-sectional shape is shown in FIG. In the figure, 7 is glass, 8 is ITQ, 9 is PTR, 10 is phosphor particle, 1
0a is a red phosphor, 10b is a green phosphor, and 10c is a blue phosphor dot, and one phosphor dot has a size of 0.15 × 0.50 mm. Each dot consists of a single particle layer of phosphor. The surface plate created by the above process is fired at about 500 ° C.
FIG. 4 shows the color test result of the gas discharge color display panel which was operated after TR was removed. This FIG. 4 shows a case where red, green, and blue are illuminated in a single color using the XYZ color system, and 3
It can be seen that good color reproducibility is obtained by showing the color reproducibility when the colors are simultaneously illuminated.

FIG. 5 shows the construction of another apparatus for coating the phosphor, which is a method of pushing with a sponge roller instead of the method of hitting with absorbent cotton of FIG. In the figure, 5a is a phosphor coating device, 11 is a feed roller for the surface plate 12, and 13
Is a phosphor dispersion portion, 14 is phosphor particles, 15 is a phosphor adhering portion, and 16 is an adhering roller.

Next, the operation will be described. When the exposed surface plate 12 is placed on the feed roller 11, the surface plate 12
Are carried to the phosphor dispersion section 13. Here, phosphor particles 1
4 descends and is evenly distributed on the face plate 12. Further, it is carried to the phosphor adhering portion 15 and lightly pressed by the roller 16 which moves along the traveling direction, so that the phosphor becomes PTR.
It is crimped to the photosensitive part of. FIG. 6 shows the structure of the roller 16, in which 17 is a shaft, 18 is a sponge, and 19 is a movable support, which moves in the direction of the arrow. By using the sponge 18 in this way, the PTR film is not damaged. In the experiment, the pressing force of the sponge 18 is 0.5 to 1.0 kgf / c.
The phosphor was sufficiently adhered to the PTR photosensitive portion at a pressure of m ² .
Further, instead of the sponge, a phosphor may be sprayed with air.

In the above-mentioned embodiment, the unnecessary phosphor is removed only by air spraying, but as a final step, a water washing step 20 may be added as shown by a dotted line in FIG. This further enhances the effect of removing the unnecessary phosphor. Further, in the above embodiment, the application to the gas discharge color display panel has been described, but the color cathode ray tube, the fluorescent display tube, or the like may be any color display panel utilizing the light emission of the phosphor. The same effect as the embodiment is obtained.

[0017]

As described above, according to the present invention, since PTR is used as the photosensitive composition for forming a phosphor screen, it is not necessary to handle chromium and a dry process is possible, so a large amount of water is used. This is effective in obtaining an inexpensive color display panel. Further, since the phosphor forms a single particle layer, there is an effect that a color display panel with high brightness can be obtained.

[Brief description of drawings]

FIG. 1 is a process drawing of forming a phosphor screen using the PTR of the present invention.

FIG. 2 is an enlarged photograph of a phosphor screen of a display panel formed by the PTR of the present invention.

3 is a cross-sectional view of the photograph of FIG.

FIG. 4 is a chromaticity diagram showing a color test result of a gas discharge color display panel formed by the PTR of the present invention.

FIG. 5 is a configuration diagram of a phosphor coating apparatus using the PTR of the present invention.

6 is a configuration diagram of the roller of FIG.

[Explanation of symbols]

 1, 2 1st process (PTR coating, drying) 3, 4 2nd process (mask alignment, exposure) 5 3rd process (phosphor coating) 5a Phosphor coating device 6 4th process (removal of unnecessary phosphor) 7 Glass 8 ITO 9 PTR 10 Phosphor particles 12 Surface plate In the drawings, the same reference numerals indicate the same or corresponding portions.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhisa Hemi 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Communication Equipment Works

Claims (1)

[Claims] 1. A photosensitive composition for forming a fluorescent screen of a surface plate of a color display panel utilizing gas discharge, comprising an alkali-soluble compound containing rosin or toluenesulfonamide and formaldehyde condensable resin as a main component. A photosensitive composition for forming a phosphor screen, which comprises at least one compound represented by the formulas (1) and (2).