JPS62281231A - Formation of phosphor screen - Google Patents

Abstract

PURPOSE:To prevent a so-called color mixture, sticking a heterochromatic luminous phosphor to a phosphor layer, from occurring, by forming an electrostatic preventive layer on a layer of the adherent material stuck to a photosensitive resin layer each time the adherent material on the residual phosphor or the like is removed. CONSTITUTION:A photosensitive resin layer 8 is formed on a substrate 7, and the specified position, where as a first color, for example, a red luminous phos phor stripe layer 10R if formed, is exposed to light, making this exposed part contact with wet air, and a sticky layer 9 is formed there. And, a red luminous phosphor 11 given is removed and the red luminous phosphor stripe layer 10 R is formed. Next, an electrostatic preventive 12 is given, then the excessive electrostatic preventive 12 is removed, and the electrostatic preventive 12 is left behind on the red luminous phosphor stripe layer 10R alone, thus an electro static preventive layer is formed. At a similar process, there are provided with a green luminous phosphor stripe layer 10G, a blue luminous phosphor stripe layer 10B and a photoabsorption stripe 13 consisting of impalpable powder of graphite. With this constitution, a color mixture due to sticking of a phosphor different in a luminous color can be prevented.

Description

[Detailed description of the invention] Detailed description of the invention 1 of 1 The present invention relates to a method for forming a phosphor screen of a cathode ray tube.

Submissive! ub1 An example of a method for forming a phosphor screen of a cathode ray tube is disclosed in Utility Model Application Publication No. 57-151.
It is disclosed in Publication No. 84G. This phosphor screen forming method will be explained with reference to FIGS. 8 to 12.

First, as shown in FIG. 1, a photosensitive resin that develops tackiness upon exposure to light, such as a mixed solution of aromatic diazonium salt and polyvinyl alcohol, is uniformly applied onto the base [(1), and a photosensitive resin layer is formed. (2) is formed. And this board <
1) Selectively expose the upper photosensitive resin layer (2) to
As shown in the figure, an adhesive layer (3) having a predetermined pattern is formed. Next, as shown in FIG. 10, a phosphor (4) is provided on the substrate (1).

Further, the phosphor adhering to the unexposed portion of the substrate (1) is removed by air blowing or the like, leaving only the phosphor (5) adhering to the sticky layer (3) as shown in FIG. 1I.

After that, a plugging agent (6) is applied onto the substrate (1), and the plugging agent (6) is removed from undesired areas by air blowing, etc., and the plugging agent (6) is removed from the phosphor (5) layer as shown in FIG. Cover with plugging agent (6).

These steps are repeated for phosphors that emit red, green, and blue light to form the phosphor screen of a color cathode ray tube.

This phosphor layer formation method involves coating the phosphor layer with a plugging agent to prevent excess moisture from being exposed to the outer surface and eliminate stickiness. This has the advantage of preventing the problem of so-called color mixing caused by adhesion of phosphors.

b f ゛
. 0 However, the problem of color mixing has not been completely solved even with the above method of forming a phosphor screen, and an improvement has been desired.

For example, in the above method, aggregation of powder due to electrostatic force is considered to be a cause of color mixing.

The present invention has been proposed in view of the above-mentioned problems, and the technical means for solving the problems includes a step of removing the remaining phosphor and light-absorbing material, and To provide a new and improved method for forming a phosphor screen, in which an antistatic layer is formed on a layer of an adhered substance such as a phosphor or a light absorbing material attached to a photosensitive resin layer during a subsequent exposure step. .

According to the present invention, during the exposure step following the step of removing undesired residual phosphors or adherent materials such as light absorbers,
An antistatic layer is formed on the layer of the desired phosphor or light absorbing material adhered to the photosensitive resin layer. Therefore, it is possible to suppress the agglomeration of powder due to electrostatic force, and furthermore, it is possible to prevent residual moisture from being exposed on the outer surface and eliminate stickiness. You can prevent ¥tL arrival such as.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 7.

First, as shown in FIG. 1, an aqueous solution of a mixture of aromatic diazonium zinc chloride double salt and polyvinyl alcohol is applied onto the substrate (A) by a spin code method and dried to form a photosensitive resin layer (8). .

As shown in Figure 2, using a photomask with a predetermined stripe pattern, first expose a predetermined position where a red emitting phosphor stripe layer (IOR) will be formed as the first color, and then remove the exposed portion. is brought into contact with moist air to form an adhesive layer (9). And the third
As shown in the figure, a red-emitting phosphor (11) is placed on the substrate (7).
), and then the red-emitting phosphor (11) adhering to the unexposed areas is removed by air blowing to form a red-emitting phosphor stripe layer (IOR) as shown in FIG.

Next, as shown in FIG. 5, an antistatic agent (12) is applied onto the substrate (7), and then the excess antistatic agent (12) is removed by air blowing. As shown, the antistatic agent (!2) is left only on the red-emitting phosphor stripe layer (IOR) to form an antistatic layer. Incidentally, at this time, it is okay if some of the antistatic agent (12) gets between the phosphors (11).

In this example, as the antistatic agent, the particle size was 10.
Fine powder of tin dioxide (SnO2) having a surface area of 0 mμ or less and a surface area per unit weight of 2°/g or more was used. In addition, as an antistatic agent other than the above, indium oxide (Inz
Fine powder of O3) is applied.

Thereafter, as shown in FIG. 7, a green-emitting phosphor stripe layer (IOC), a blue-emitting phosphor stripe layer (IOB), and a light-absorbing stripe (13) made of fine graphite powder are formed by repeating the same steps. do.

The fluorescent screen formed in this way had a much higher color purity than the fluorescent screen formed by the conventional method, perhaps due to color mixture.

In this embodiment, a method for forming a phosphor screen consisting of red, green, and blue emitting phosphor stripes and light absorption stripes has been described, but the present invention is not limited thereto.

As explained above, the method for forming the phosphor screen of the present invention is to avoid color mixture caused by phosphors of different emission colors being attached to one phosphor layer in the process of forming another phosphor layer. It has the effect of preventing

[Brief explanation of drawings]

1 to 7 are side sectional views of main parts in each step showing an embodiment of the present invention, and FIGS. 8 to 12 show an example of a conventional method for forming a phosphor screen. 6 (7)...Substrate (8)...Photosensitive resin layer (IOR), (IOC), (108)...Fluorescence Body stripe layer (■2)... Antistatic agent patented by Kansai NEC Co., Ltd. 7'
Dye ri Figure 4; N 5 i, j 6th L co

Claims (1)

[Claims] A photosensitive resin layer that develops tackiness upon exposure to light is formed on a substrate, and desired portions thereof are selectively exposed to light, and an adherend substance such as a phosphor is supplied and adhered to remove unwanted particles on the photosensitive resin layer. In a method of forming a phosphor screen by repeating the step of removing the remaining adherent material from a portion of the adherend material such as a different color emitting phosphor, each time the remaining adherent material such as the phosphor is removed. A method for forming a phosphor screen, comprising forming an antistatic layer on the layer of the adherend material adhering to the photosensitive resin layer.