KR0161708B1 - Manufacturing method of phosphor film for color crt - Google Patents

Abstract

The present invention relates to a fluorescent film manufacturing method for a color CRT for manufacturing a fluorescent film formed on the front of the panel of the color CRT bulb to emit light when the electron beam generated by the electron gun is emitted and strikes to realize a shape. In particular, the present invention relates to a method for producing a fluorescent film for color CRT for producing a fluorescent film capable of improving the contrast of a screen, and the present invention is applied to a blue phosphor, a green phosphor, and a red phosphor coated part in advance to absorb external light. It provides a fluorescent film manufacturing method for color CRT for manufacturing a fluorescent film that can increase the contrast of the CRT screen by reducing the reflectance.

Conventional color CRT consisting of applying, drying, photosensitizing and developing photoresist, applying, drying, and developing black dag, and applying, drying, photosensitizing and developing blue phosphor, green phosphor and red phosphor In the method for producing a fluorescent film for use, a DAG solution composed of pure water, an electrophoretic dag, a dispersing surfactant, and an acrylic emulsion is formed on the inner surface of the channel between the steps of applying the black stripe and the like. It provides a method for producing a fluorescent film for color CRT characterized in that the coating step is added.

Description

Manufacturing method of fluorescent film for color CRT

The present invention relates to a fluorescent film manufacturing method for a color CRT for manufacturing a fluorescent film formed on the front of the panel of the color CRT bulb to emit light when the electron beam generated by the electron gun is emitted and strikes to realize a shape. In particular, the present invention relates to a fluorescent film manufacturing method for color CRT for producing a fluorescent film capable of improving the contrast of a screen.

In order to manufacture the fluorescent film of the above-mentioned color CRT, the following method has conventionally been used. That is, when the photoresist is applied to the back surface of the panel, dried, and then exposed to photoresist, the black resist is formed. The black stripe is formed by applying a black stripe lag to the groove, drying and developing. After the black stripe is formed, the blue phosphor, the green phosphor, and the red phosphor are sequentially applied, dried, and then exposed to light for development, thereby forming a fluorescent film.

However, the fluorescent film of the CRT manufactured by the conventional fluorescent film manufacturing method causes a problem that external light is reflected when external light is reflected on the front surface of the screen, thereby lowering the contrast of the CRT.

In order to solve the above problems, the present invention is to apply a blue coating, a green phosphor and a red phosphor to the coating groove to absorb the appearance to reduce the reflectance to manufacture a fluorescent film that can increase the contrast of the CRT screen A method of manufacturing a fluorescent film for color CRT will be described.

In order to achieve the above object, the present invention provides a method for coating, drying, photosensitive and developing photoresist, coating, drying and developing black dag, and coating, drying, In the conventional method for producing a fluorescent film for color CRT, which is composed of photosensing and developing, a pure, electrophoretic dag, a dispersing surfactant, and an acryl between steps such as applying the black stripe and applying such a blue phosphor. It is characterized in that the step of applying to the inner surface of the panel DAG solution composed of an emulsion is added.

According to the present invention having the above-described configuration, it is possible to provide a high quality color CRT by realizing high contrast of the screen by smoothly absorbing external light reflected on the front surface of the CRT and lowering its reflectance.

Hereinafter, a method of manufacturing a fluorescent film for color CRT according to a preferred embodiment of the present invention will be described.

In order to form a section for forming a black stripe, a photoresist is first applied to the entire surface of the panel, dried, and then exposed to light as in the conventional method, and then developed.

After developing the photoresist, the black stripe is formed by applying all of the black stripe dag to the back surface of the panel as in the prior art and drying it.

According to the present invention, a thin dag is applied and dried instead of performing a process such as applying a phosphor such as a blue phosphor immediately after forming a black stripe as in the conventional case. The thin dag is composed of pure water, electro fine dag, a dispersing surfactant and an acrylic emulsion thermal adhesive, but preferably has a solid content in the range of 0.0001-3% by weight. By carrying out this process, an external light absorbing film is formed.

Thereafter, the steps of applying, drying, photosensitive, and developing the blue phosphor, the green phosphor, and the red phosphor between the black stripes are performed in the same manner as in the prior art.

The thin dag film formed by the above-described fluorescent film forming method absorbs external light and lowers the reflectance, thereby increasing the contrast of the screen.

Claims (2)

Conventional color CRT consisting of applying, drying, photosensitizing and developing photoresist, applying, drying, and developing a black stripe dag and applying, drying, photosensitizing and shaping blue phosphor, green phosphor and red phosphor In the method of manufacturing a fluorescent film for a surface, the inner surface of a CRT panel is a DAG solution composed of pure water, electrophoretic dag, a dispersing surfactant, and an acrylic emulsion between the step of applying the black stripe and the step of applying the blue phosphor. Method for producing a fluorescent film for color CRT, characterized in that the step of applying to. The method of claim 1, wherein the solid content of the Dag solution is 0.0001-3% by weight.