KR19980051544A - Screen Forming Method of Color Brown Tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a screen of a color brown tube, and in particular, in forming a black matrix used to absorb external light between a glass surface and a phosphor layer, a black matrix is formed between a phosphor layer and an emulsion layer to form a white screen. The purpose is to improve the uniformity.

In order to achieve this, the present invention, in the screen forming method, after applying a precoating solution to the inner surface of the panel washed with hydrofluoric acid, pure water, airborne, and injecting a phosphor slurry of red, blue, green on the precoating layer to form a phosphor layer And forming a resin layer on the phosphor layer, applying a photoresist liquid on the resin layer, and forming a black matrix layer on the photoresist layer.

Description

Screen Forming Method of Color Brown Tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent film of a color brown tube, and in particular, to improve the white uniformity of a screen by preventing the color of the phosphor layer applied to the inside of the panel from being affected.

The conventional fluorescent film is formed on the inner surface of the panel 1 as shown in Figs. 1 and 2. Looking at the structure, a black matrix layer 3 is formed to absorb external light and improve the contrast of the screen. Phosphor layers 5 of R, G, and B which are emitters are formed thereon. The emulsion layer is coated on the phosphor layer to form the filming layer 6, and then the aluminum thin film 7 is formed.

The method of manufacturing the light emitting surface of the CRT is to wash the inner surface of the panel (1) with hydrofluoric acid, air, and pure water to activate the inner surface with OH-, and then apply a photoresist solution of PVP + AZIDE or PAD + AZIDE. After drying, the photomask is exposed by inserting a shadow mask and then developed to form a photoresist layer 2 as shown in FIG. Subsequently, the black material is coated and dried, and the photocured photoresist layer is swelled and removed using an etching solution such as hydrogen peroxide and sodium hypochlorite to form a black matrix layer 3 as shown in FIG. The inner surface of the panel where the black matrix layer 3 is completed is washed with pure water and then the precoat liquid is applied to form the precoat layer 4. Subsequently, a green phosphor slurry composed of polyvinyl alcohol (PVA) and sodium dichromate (Na 2 Cr 2 O 7) is applied and dried, and then exposed and developed by inserting a shadow mask to form a green phosphor layer (G). The blue phosphor layer B and the red phosphor layer R are also formed in the same manner. The order of forming the phosphor layer can also be in the order of B, G and R. Finally, an emulsion film 6 for depositing the aluminum thin film 7 is formed.

Since the prior art forms green, blue, and red fluorescent films on the black metrics, a large fluorescence width or irregular cutting when the fluorescent layer is developed, as shown in FIG. As such, when the raster is turned on by being applied near the other light emitting part, the light emitted from the part is mixed with the light emitting light of the other part, so that the white uniformity of the coating film becomes bad.

The present invention was invented to solve the problems of the prior art as described above, by forming a phosphor layer on the inner surface of the panel, and then applying a PVA solution to dry and forming a black matrix layer thereon, thereby forming a white uniform on the screen. The goal is to improve the tee.

1 is a view of forming a phosphor layer on a conventional screen.

2 is a flow chart of forming a conventional screen.

Figure 3 shows a fluorescent layer formed on the inner surface of the panel, (a) is a state of the dot form, (b) is a state diagram of the stripe form.

4 is a flow chart of forming a screen according to the present invention.

5 is a fluorescent layer formation diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

101: panel 102: black matrix layer

103: photoresist layer 104: precoat layer

105: phosphor layer 106: peeling layer

107: aluminum thin film layer 108: water-soluble polymer resin layer

The invention is described in detail below with reference to FIGS. 4 and 5.

First, the screen forming process of the present invention, the panel 101 is washed with hydrofluoric acid, pure water, and airborne to activate the inside of the panel with OH ⁻ , and a precoat layer containing PVA as a main component and dried to form a precoat layer 104. do.

Then, the green phosphor slurry suspended in the photocrosslinker and the surfactant is injected, rotated, and dried by inserting a shadow mask, followed by exposure to develop the green phosphor layer at a desired position. The blue phosphor slurry having the same composition as the green phosphor slurry is injected and rotated, dried, and exposed by inserting a shadow mask, followed by developing with pure water to form a blue phosphor layer at a desired position. Finally, the red phosphor slurry is injected, rotated, dried, and exposed by inserting a shadow mask, followed by developing with pure water to form a red phosphor layer. The order of application of the phosphor layer 105 may be applied from any phosphor, green, blue or red.

When the application of the phosphor layer 105 is completed, the resin layer 108 having PVA as a main component is formed, and a photoresist liquid having a normal discomfort property is applied thereon and dried, and a shadow mask is inserted into the green, blue, red 3 The photoresist layer 102 is formed as shown in FIG. 4 by performing color exposure and developing to remove unexposed portions.

Subsequently, an external light absorbing material mainly composed of graphite is applied and dried, and then the photocured portion is swelled using an etchant such as sodium hypochlorite or hydrogen peroxide, and developed with pure water to form the graphite strip black matrix layer 103.

Finally, a filming layer 106 for forming the aluminum thin film 107 is formed.

Since the black matrix graphite band 103 formed above prevents a portion that should not be emitted from the back side, as shown in FIG. 5, it can be prevented from affecting other colors even when emitting light, thereby improving the white uniformity by about 20%. will be.

As described above, the screen forming method of the present invention prevents each phosphor from affecting other colors when the phosphor emits light, thereby improving the white uniformity of the screen.

Claims (5)

Applying a pre-coating solution to the inner surface of the panel washed with hydrofluoric acid, pure water, and air; Injecting a red, blue, green phosphor slurry on the pre-coating layer to form a phosphor layer, and forming a black matrix layer on the phosphor layer, characterized in that the screen forming method of the color brown tube. The method of claim 1, wherein a resin layer is formed between the phosphor layer and the black matrix layer. The method of claim 1, wherein an emulsion or lacquer type filming layer is formed on the black matrix layer. The method of claim 2, wherein the resin layer comprises a water-soluble high molecular material such as PVP, PAA, PAD, or PVA. 3. The method of claim 2, wherein the resin layer is a composition comprising a water-soluble high molecular material as a main component and a combination of silicon dioxide (SiO ₂ ) and a surfactant.