JPH0447632A - Fluorescent screen forming method for color picture tube - Google Patents

Abstract

PURPOSE:To uniformly form smooth aluminum film with formation of an uniform process-liquid layer by forming an aqueous solution layer with an aqueous solution having a preset range of surface tension. CONSTITUTION:Surfaces of three color phosphor layers 10B, 10G, 10R are treated with an aqueous solution of surface active agent adjusted to have its surface-tension from 30 to 50dyne/cm so that an aqueous solution layer 22 of surface active agent is formed. Furthermore, an acrylic emulsion solution is sprayed onto the aqueous solution layer 22 of surface active agent so that an acrylic emulsion solution layer is formed. Then, after drying the acrylic emulsion solution layer and the aqueous solution layer of surface active material thereunder, an organic resin film 23 consisting of acryl is formed on the three color phosphor layers 10B, 10G, 10R. After that, an aluminum film 13 is formed by vacuum deposition on the organic resin layer 23. And the organic resin film 23 below the aluminum layer 13 is decomposed to be removed, so that the aluminum film 13 sticks closely to the three color phosphor layers 10B, 10G, 10R.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) This invention relates to a method for forming a phosphor screen of a color picture tube, and particularly relates to a method for forming a phosphor screen of a color picture tube, and in particular a method for forming a phosphor screen of three colors constituting the phosphor screen. The present invention relates to a method for forming a phosphor screen of a color picture tube in which a uniform aluminum film is formed.

(Prior Art) Generally, a color picture tube has a panel (
1) and a funnel (2) integrally joined to this panel (1);
), an electron gun (4) is disposed in the neck (3) of the panel (1), and faces a shadow massmer (5) in which a large number of electron beam passage holes are formed, which is attached to the inner surface of the panel (1). A phosphor screen (6) is formed. Then, three electron beams (7B), (7
G), (71?) is deflected by the magnetic field generated by the deflection yoke (8) attached to the outside of the funnel (2), and the phosphor screen (6) is horizontally and vertically scanned. 6) It is formed in a structure that displays a color image thereon.

As shown in FIG. 4(a), the phosphor screen (6) has conventionally been made up of dot-shaped three-color phosphor layers (1, OB), (LOG), (LOR) that emit light in blue, green, and red. ) is 6
A phosphor screen densely arranged on lines intersecting at an angle of 0°, as shown in (b), three-color phosphor layers (], OB), (LOG), (IOR) in the form of vertically elongated stripes. ) are phosphor screens arranged closely in the horizontal direction, and as shown in (e) and (d), the dot-shaped or striped three-color phosphor layer (IOB), (1,0G),
There is a black matrix type or black stripe type phosphor screen in which a black light absorption layer (11) is formed in the gap of the (IOR).

Usually, this phosphor screen (6) is exposed to electron beams (7B), (
7G).

Three-color phosphor layer (if) B by landing of (7R)
).

Electron beams (7B), (7
In order to prevent deterioration due to impact of G) and (7R), three color phosphor layers (IOB) and (I
An aluminum film (3) is formed on the back surface (electron gun side surface) of OC) and (IOR).

Conventionally, this aluminum film (13) is formed on the panel (1).
) For example, a three-color phosphor layer (JOB) formed on the inner surface,
(10G), (1,01?) is treated with water or a dilute aqueous solution of polyvinyl alcohol (PVA) to form a layer of water or PVA aqueous solution, and then sprayed onto the layer of water or PVA aqueous solution. An organic resin solution consisting of an acrylic emulsion is applied and dried to form an organic resin film, and aluminum is vacuum-deposited on the organic resin film.

When forming this aluminum film (I3), the reason why an organic resin film is formed under it is that aluminum fine particles form a three-color phosphor layer (LOB) during vacuum deposition.

This is to prevent it from penetrating into (1,0G) and (101?). In addition, when forming the organic resin film, three-color phosphor layers (], OB), (], OG),
The reason for treating (1,01?) with water or PVA aqueous solution is the three-color phosphor layer (IOB).

A uniform organic resin film is formed on (LOG), (1,01?), and a uniform and smooth aluminum film (
13) is to be formed.

Note that the organic resin film below the aluminum film (13) is decomposed and removed by heating during bonding of the panel and the funnel after the phosphor screen (6) is formed, and the aluminum film (13)
is a direct three-color phosphor layer (1, OB), (LOG)
.

Close contact with (101?).

(Invention or Problem to be Solved) As mentioned above, the phosphor screen of a color picture tube is made by forming a dot-shaped or striped phosphor layer of three colors on the inner surface of the panel, and then applying water onto the three-color phosphor layer. Alternatively, it can be formed by treating with a PVA aqueous solution or the like, coating the water or PVA aqueous solution layer with an organic resin solution to form an organic resin film, and then vacuum-depositing an aluminum film on the organic resin film.

However, when a phosphor screen is formed by the above method, a smooth aluminum film cannot be uniformly formed, which causes a decrease in white uniformity.

That is, the three-color phosphor layer is formed by applying a phosphor slurry containing phosphor, PVA, ammonium dichromate (ADC), etc. as its main components, and is coated with a phosphor slurry to improve adhesion to the inner surface of the panel. , an acrylic emulsion is added in addition to the above main ingredients. The minimum film forming temperature of this acrylic emulsion varies depending on the degree of polymerization of the acrylic resin, but is approximately 39°C. Then, an acrylic resin film is formed on the surface of the dried phosphor slurry layer, and the phosphor layer is cured. Therefore, even when treated with water or a PVA aqueous solution to form a uniform organic resin film on the three-color phosphor layer, it is partially repelled and a uniform layer of water or PVA aqueous solution cannot be obtained. As a result, the organic resin film becomes uneven, making it impossible to uniformly form a smooth aluminum film.

This invention was made to solve the above problems, and it is possible to form a uniform treatment liquid layer regardless of the state of the three-color phosphor layer to uniformly form a smooth aluminum film. The purpose of this invention is to obtain a method for forming a phosphor screen.

[Structure of the invention] (Means for solving the problem) A three-color phosphor layer formed on the inner surface of the panel is treated with an aqueous solution to form an aqueous solution layer, and an organic resin solution is applied to the aqueous solution layer. After forming an organic resin solution layer and drying this organic resin solution layer together with the aqueous solution layer to form an organic resin resin film, an aluminum film is formed on this organic resin resin film. In the forming method, the aqueous solution layer has a surface tension of 30 to 50 dyn at 25°C.
It was made to form using an aqueous solution of e/cm.

(Function) As mentioned above, the aqueous solution layer formed on the three-color phosphor layer is
When using an aqueous solution with a surface tension of 30 to 50 dyne/cm at 25°C, due to its low surface tension, 3
A uniform aqueous solution layer can be formed without being affected by the surface condition of the color phosphor layer, and the organic resin film formed on it can be made uniform to form a smooth aluminum film uniformly. become able to.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows a method for forming a phosphor screen, which is an embodiment of the method. First, as shown in FIG. 1(a), a phosphor slurry containing phosphor, PVA and ADC as main components is applied to the inner surface of the panel (1) and dried to form a phosphor slurry layer (20). Form. Next, as shown in (b), a shadow mask (5) is attached to the panel (1) on which the phosphor slurry layer (20) is formed, and the phosphor slurry is applied through the shadow mask (5). The layer (20) is irradiated with light emitted from an exposure light source (not shown) to remove the phosphor slurry layer (20).
) is the electron beam passage hole (21) of the shadow mask (5).
Burn the corresponding pattern. Next, as shown in (C), the phosphor slurry layer on which the pattern has been baked is developed to remove the unexposed area, and a phosphor layer of any one color, for example, a dot-shaped or striped blue phosphor layer, is formed. Layer (IOB
) to form.

Furthermore, by repeating the above method for forming the blue phosphor layer (IOB) for other color phosphors, a dot-shaped or striped three-color phosphor layer (IOB) can be obtained as shown in (d).
B) , (LOG) , (10R) are formed.

Next, as shown in (e), the three-color phosphor layer (1
.
22).

Next, as shown in (f), an acrylic emulsion aqueous solution is sprayed onto the surfactant aqueous solution layer (22) J2 to form an acrylic emulsion aqueous solution layer (organic resin solution layer). The acrylic emulsion aqueous solution layer and the surfactant aqueous solution layer below it are dried to form three-color phosphor layers (1, OB) and (LOG).

(1, OI?) An organic resin film made of acrylic (23
) to form. Thereafter, as shown in <r>, an aluminum film (
13).

Note that the organic resin film (23) below this aluminum film (13) is decomposed and removed by heating during subsequent bonding of the panel and funnel, and the aluminum film (13) is
Direct three-color phosphor layer (IOB), (LOG), (IOR)
i: Close contact.

By the way, a three-color phosphor layer (LOB) can be formed by the above method.

Aluminum film (13
), a uniform and smooth aluminum film can be obtained.

That is, the three-color phosphor layer was treated with aqueous solutions with different surfactant concentrations, and the film formability of the organic resin film formed thereon was investigated using Triton CT-45 surfactant manufactured by Rohm and Haas. When tested, the curve (25
) The results shown are obtained. In this figure 2, on the vertical axis showing the film formability of the organic resin film, ○, △, and × indicate the degree of occurrence of unevenness and stains, O indicates good film formability with no unevenness and stains, and △
indicates that unevenness occurs partially, and X indicates that unevenness or smearing occurs over the entire surface. As shown in curve (25), when the surface tension of the surfactant aqueous solution is less than 30 dyne/cm, unevenness occurs partially, and when it exceeds 50 dyne/cm, the surfactant aqueous solution layer is partially repelled. hand,
The organic resin film started to become uneven, and after 30 to 50 days
A uniform organic resin film was obtained within the range of yne/cITl.

Of course, the concentration of the aqueous surfactant solution that does not cause unevenness in the organic resin film depends on the surface condition of the three-color phosphor layer. However, if the above range is used, for example, an acrylic resin film will be formed on the surface of the phosphor layer due to the acrylic emulsion added to the phosphor slurry, and even if the phosphor layer is cured, the organic resin film will not be uniform. It is possible to form a smooth aluminum film uniformly.

In addition, if the phosphor layer is not cured, 70 dyne/c
It has been confirmed that no unevenness occurs in the organic resin film up to a surface tension of m.

The case where an aluminum film is formed on the dot-shaped or striped three-color phosphor layer has been described above, but this invention has a light absorption layer in the gap between the dot-shaped or striped three-color phosphor layer. It can also be applied to forming an aluminum film on a phosphor screen.

[Effect of the invention] When forming an aluminum film on the three-color phosphor layer formed on the inner surface of the panel, the three-color phosphor layer is treated with an aqueous solution having a surface tension of 30 to 50 dyne/cm at 25°C, When an organic resin solution layer is applied on the aqueous solution layer to form an organic resin film, and an aluminum film is formed on this organic resin film, due to the low surface tension of the aqueous solution, 3
A uniform aqueous solution layer can be formed without being affected by the surface condition of the color phosphor layer, and the organic resin film formed thereon can be made uniform to form a uniform and smooth aluminum film. It is possible to form a phosphor screen with good white uniformity.

[Brief explanation of drawings]

Figures 1 (a) to g) are diagrams for explaining a method for forming a phosphor screen of a color picture tube, which is an embodiment of the present invention, and Figure 2 shows a surfactant for treating a three-color phosphor layer. A diagram showing the relationship between the surface tension of an aqueous solution and the film formability of an organic resin film formed thereon, Figure 3 is a diagram showing the configuration of a color picture tube, and Figures 4 (a) to (d) are respectively These are diagrams showing the structure of the phosphor screen of a color picture tube, in which (a) is a plan view showing the structure of the phosphor screen made up of dot-shaped three-color phosphor layers, and (b) is a plan view showing the structure of the phosphor screen made of striped three-color phosphor layers. (C) is a plan view showing the structure of a phosphor screen in which a light absorption layer is formed in the gap between dot-like three-color phosphor layers; (d) is a plan view showing the structure of a stripe-like three-color phosphor layer. FIG. 5 is a plan view showing the configuration of a phosphor screen in which a light absorption layer is formed in the gap, and FIG. 5 is a sectional view of the phosphor screen in which a three-color phosphor layer and an aluminum film are formed thereon. 1...Panel, 5...Shadow mask,
10B, 1.0G, IOR...3-color phosphor layer, 1
3... Aluminum film, 20... Phosphor slurry layer,
22...Surfactant aqueous solution layer, 23...Organic resin film. Agent: Patent Attorney Norihiro Ogo Fubee@Rimi, ￥Shigeku-ku

Claims (1)

[Claims] The three-color phosphor layer formed on the inner surface of the panel is treated with an aqueous solution to form an aqueous solution layer, and an organic resin solution is applied onto this aqueous solution layer to form an organic resin solution layer. In a method for forming a phosphor screen of a color picture tube in which an organic resin solution layer is dried together with the aqueous solution layer to form an organic resin film, and an aluminum film is then formed on the organic resin film, the aqueous solution layer is dried on the surface at 25°C. Tension is 30~50d
1. A method for forming a phosphor screen of a color picture tube, characterized in that the phosphor screen is formed using an aqueous solution having a yen/cm.