JPS5816436A - Formation of color-picture tube phosphor screen - Google Patents

Abstract

PURPOSE:To form the phosphor screen above-captioned which is able to prevent a drop of brightness of green-and-blue phosphor substance by a method, wherein, after forming a phosphor film, simultaneously with, or before wherein a water film, the phosphor film is treated with a solution containing colloidal silica. CONSTITUTION:A photoadhesive substance mainly comprising a diazocompound is applied to the inside of a panel to be exposed after mounting a color selective electrode like a shadow mask. Said shadow mask is then removed and a phosphor substance is stuck on a cohesive part. Further the phosphor substance given to an unexposed part is removed by developing. By repeating said process a phosphor film is formed inside of the panel. Thereafter said phosphor film is treated and washed with a water solution comprising a high molecular cohesive agent and a surface-active agent, then a phosphor screen is completed through the filming and alminizing process, whereby the phosphor film is treated with a liquid containing colloidal silica simultaneously with or before the formation of a water film in the filming.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a phosphor surface of a color receiver tube, in which a phosphor is attached using a substance that develops tackiness upon exposure to light.

In general, the phosphor surface of a color tube is made up of regularly arranged phosphor pixels of three colors: green, blue, and red. A method using a photosensitive adhesive has been proposed.

An example of this method is to first apply a photo-adhesive substance to the inner surface of the panel. As such a substance, a composition containing a double salt of a diazo compound and zinc chloride as a main component, and a polymer compound or a surfactant added thereto is generally used. Next, a color selection electrode such as a shadow mask is attached to the panel, and after exposing the phosphor pixel forming portion of the first color, for example, green light, on the exposure table, the shadow mask is removed. Apply green-emitting phosphor powder to the inner surface of the panel and apply it to areas that have become sticky due to exposure! Attach the i & phosphor. Next, development is performed using an air blower or the like to remove excess phosphor powder that has been applied to unexposed areas, thereby forming phosphor picture elements of the first color. By repeating the above-mentioned process of exposure and subsequent steps for the other two colors, blue and red, three-color phosphor picture elements are completed. Thereafter, it is treated and washed with an aqueous solution containing a polymer flocculant and a surfactant, and then undergoes a fill-electron aluminization process to complete a fluorescent surface.

However, this method has a problem in that the brightness of the green and blue phosphors decreases by 6 to 15% by 1 degree on the formed phosphor surface.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for forming a phosphor surface of a color picture tube that can prevent the edges and the reduction in the brightness of the blue phosphor as described above. It is about providing.

In order to achieve such an object, the method for forming a color picture tube phosphor surface of the present invention includes a method of forming a phosphor surface of a color picture tube, after forming each color phosphor pixel, at the same time as or before forming a water film during filming. The process involves treating the fluorescent film with a liquid containing silica.

The above-mentioned treatment may be carried out simultaneously with the cleaning after the formation of the phosphor picture elements or the formation of a water film during subsequent filming, or may be carried out separately between the two.

Moreover, these may be implemented in duplicate.

The reason why the brightness of the green and blue phosphors is prevented from decreasing by treating the colloidal silica with a solution is not necessarily clear, but the following may be considered. In other words, the brightness decrease in green and blue phosphors is due to the fact that zinc sulfide, which is their base material, undergoes thermal oxidation in the post-process baking and exhaust process 1, causing a part of the surface to change in quality. As a result, it is thought that this is because a thin filter substance is generated and blocks the light emission. On the other hand, when colloidal silica is added, the above-mentioned surface deterioration is suppressed, so it is thought that a decrease in brightness can be prevented. It has been confirmed that similar effects can be obtained with silicates such as potassium silicate in addition to colloidal silica, but in this case, the hydrogen ion concentration of the solution containing the silicate is high. This has the disadvantage that the phosphor easily peels off.

The appropriate concentration of colloidal silica to be used is from 0.01% to less than 2%; if it is too low, the effect will be small, and if it is too high, the brightness will decrease due to absorption of the electron beam by the colloidal silica.

Practically speaking, a range of o, oi to about 0.5% is desirable.

Examples will be described below.

Example 1 First, a photosensitive adhesive having the following composition I was applied to the inner surface of a panel of a 14-inch collar receiver tube and dried to form a film.

(Composition I) Next, after attaching a shadow mask to the panel, the green phosphor layer was exposed to light on an exposure table.

The exposure conditions were an illuminance of 18 W/m' and an exposure time of 180 seconds. After exposure, a green phosphor was applied to the inner surface of the panel and adhered to areas that developed tackiness due to exposure, and excess phosphor was removed by air spray development. Next, the steps below the exposure described above are performed in blue.

The same procedure was performed for the red phosphor to form three-color phosphor stripes on the inner surface of the panel.

Next, the fluorescent film was washed with a solution having the composition 1 below.

(Composition ■) Next, the fluorescent film was wetted with a 0.3 wt % aqueous solution of Snowtex C (trade name) as a liquid containing colloidal silica, and then dried.

After freezing and forming an aqueous film using an aqueous solution with the following composition (1), an organic film is formed on the fluorescent film by spraying a lacquer solution for filling (1) with the composition (2), and then an aluminization process is performed to form a fluorescent film. Completed the surface.

(Composition I) (Composition W) The color picture tube phosphor surface thus formed had good quality, with no reduction in the brightness of the green and blue phosphors.

Example 2 After forming three-color phosphor stripes in the same manner as in Example 1, 0 slvt% of Snowtex C was added to the composition of Example 1.
The fluorescent film was washed with the added solution and dried. Next, in the same manner as in Example 1, after forming a water film with a solution of composition 1,
An organic film was formed with a solution of
Good quality was obtained.

Example 3 Three-color phosphor picture elements were formed in the same manner as in Example 1, and after washing and drying the phosphor film with a solution of composition (1), composition I of Example 1 was prepared.
A water abdomen was formed with a solution in which Q and 5 wt% of Snowtex C were added. Subsequently, in the same manner as in Example 1, the composition
An organic film was formed using a solution of the above, and a fluorescent surface was formed through an aluminization process.

The phosphorescent surface formed in the above manner showed no decrease in brightness and had good quality.

As explained above, according to the method for forming a color picture tube phosphor surface according to the present invention, after forming a phosphor pixel using a photoadhesive substance, the film is formed simultaneously with the formation of a water film in the filming process. Alternatively, it is possible to prevent the brightness of green and blue phosphors from decreasing and form a phosphor surface of excellent quality by treating the phosphor film with a solution containing colloidal silica. It has the excellent effect of being able to

Claims (1)

[Claims] The process of coating the inner surface of the panel with a substance whose main component is a diazo compound and which becomes sticky when exposed to light, and the process of applying a substance for each color.
After exposure through a color selection electrode, a phosphor is applied, the phosphor is attached to the area that has become sticky due to the exposure, and the phosphor applied to the unexposed area is removed by the present invention. By repeating the steps of forming a fluorescent film on the inner surface of the panel, treating the fluorescent film with an aqueous solution containing a bird molecule flocculant and a surfactant, and forming a water belly on the surface of the fluorescent film. a filming step of forming a liquid film of a water-insoluble organic solvent in which the organic film material is dissolved and then drying to form an organic film on the fluorescent film; In a method for forming a fluorescent surface of a color receiver tube, which includes an aluminizing step of forming a metal reflective film thereon, after forming the fluorescent film, at the same time as or before forming a pre-water distribution film, A method for forming a fluorescent surface of a color receptor tube, comprising the step of treating the film with a solution containing colloidal silica.