KR19980059342A - Luminescent film with improved luminance and method of manufacturing same - Google Patents

Abstract

Forming a first phosphor dot by forming a conductive layer and a photoconductive layer on a cathode ray tube panel having a black matrix, charging the panel, exposing the light, applying a first phosphor material, and developing the first phosphor dot. Forming a second phosphor dot on a portion where the first phosphor dot is not formed by charging, exposing the panel, applying a second phosphor material, and developing the panel on which the first phosphor dot and the second phosphor dot are formed. Forming a third phosphor dot on a portion where the first phosphor dot and the second phosphor dot are not formed by charging, exposing the entire surface, and then exposing, applying and developing a third phosphor material. When the panel in which the two-phosphor dots and the third-shaped dots are formed is fixed, and an intermediate film and an aluminum film are formed to manufacture a fluorescent film, the emission luminance of the fluorescent film is improved. Can kill.

Description

Luminescent film with improved luminance and method of manufacturing same

[Industrial use]

The present invention relates to a fluorescent film having improved luminance and a method of manufacturing the same, and more particularly, when a fluorescent film for color cathode ray tubes is manufactured by a dry electrophotographic method, the first and second components are formed to form a third fluorescent substance. The present invention relates to a fluorescent film having improved luminance of a third fluorescent substance to be formed third by adding a step of exposing the panel on which the first fluorescent substance and the second fluorescent substance are formed to be exposed to the entire surface, and a manufacturing method thereof.

[Prior art]

A typical shadow-mask type CRT has three electron beams, red, blue, and green, which are irradiated by an electron beam launcher, concentrate through a hole in a shadow mask and concentrate them in one point. Each electron beam collides with red, green, and blue phosphors formed on a phosphor screen to reproduce a predetermined image.

The fluorescent surface is composed of red, green, and blue phosphors formed in a predetermined pattern, and a black matrix, which is a light absorption film formed on the same surface between the phosphors. It is common to use a process of etching using. However, such a process has an excessive process cost, is not able to form excellent phosphors and black matrix dots, and also has a problem of polluting the environment because acid is used as the etching solution. In order to solve the above problems, studies have been put into practical use to greatly improve the process using a dry electrophotographical method for the black matrix and the fluorescent surface.

A general manufacturing process for forming a black matrix and a fluorescent surface by using a dry electrophotographic method centering on the fluorescent surface will be described with reference to FIG. 4.

A black matrix is manufactured by forming a conductive layer and a photoconductive layer on a panel for a cathode ray tube, electrostatic charging the panel, exposing the charged panel, applying a black matrix material, and then developing and fixing the black matrix material. The work of forming the red, blue, and green phosphor dots on a portion where the black matrix on the panel thus formed is not formed is in progress. First, a surface potential is formed on the panel so that the panel and the phosphor can form an electrostatic bond, and the mask is exposed after exposure. After exposure, red fluorescent substance is apply | coated by the spray etc. and a hypothesis is performed. Thereafter, the blue and green phosphors are repeatedly subjected to the process from the surface potential formation to the home attachment, and finally, these phosphors are fixed, an intermediate film is formed using a filming solution, and an aluminum (Al) film is deposited to complete the fluorescent film. .

However, when the fluorescent film is manufactured by using the conventional dry electrophotographic method, as shown in FIG. 2, the size of the third phosphor dot formed after forming the first phosphor and the second phosphor is small. have. This phenomenon is because, after forming the first phosphor and the second phosphor, the surface potential of the fluorescent film is increased to hinder the formation of the third phosphor dot after the formation of the first phosphor and the second phosphor. There is a problem that lowers the amount of light and consequently lowers the overall luminance of the fluorescent film.

The present invention has been made to solve the problems of the prior art as described above, the present invention is to increase the degree of fullness of the third fluorescent material is formed third, the fluorescent film for cathode ray tube with improved luminance of the third phosphor and its manufacturing method The purpose is to provide.

1 is a plan view showing a phosphor dot formed by the method for producing a fluorescent film according to an embodiment of the present invention.

2 is a plan view showing a phosphor dot formed by a method for producing a fluorescent film according to a conventional method.

3 is a process chart showing a process of forming a fluorescent film by a dry electrophotographic method according to an embodiment of the present invention.

4 is a process chart showing a step of forming a fluorescent film by a conventional dry electrophotographic method.

5 is a graph showing the surface potential of the fluorescent film in the step of forming the fluorescent film by a conventional dry electrophotographic method.

1: first phosphor dot

2: second phosphor dot

3: third phosphor dot

In order to achieve the object of the present invention as described above, the present invention, by forming a conductive layer and a photoconductive layer on a panel for a cathode ray tube formed with a black matrix, by charging and exposing the panel, applying a first phosphor material and developing Forming a first phosphor dot Forming a second phosphor dot on a portion where the first phosphor dot is not formed by charging, exposing, applying a second phosphor material, and developing the panel on which the first phosphor dot is formed. Step 3 A third phosphor dot is formed on a portion where the first phosphor dot and the second phosphor dot are not formed by charging, exposing, applying a third phosphor material, and developing the panel on which the first phosphor dot and the second phosphor dot are formed. Forming a panel in which the first phosphor dot, the second phosphor dot, and the third phosphor dot are formed; On, and provides a first phosphor dot and the second after charging the panel, the phosphor dots are formed, producing a fluorescent film according to claim further comprising the step of front exposing method and a fluorescent film formed by such a manufacturing method. Here, after charging the panel on which the first phosphor dot and the second phosphor dot are formed, the entire surface exposure is preferably carried out for 0.5 seconds using an optical lamp of 300 lux, and the first phosphor material and the second The phosphor material uses a red or blue phosphor material, and it is preferable that they are not used overlapping each other.

EXAMPLE

Representative Example

In order to proceed with the process of forming red, green, and blue phosphor dots on the black matrix formed on the panel where the black matrix for cathode ray tubes formed by the dry electrophotographic method is formed, first, the panel and the phosphor are electrostatically bonded. Surface potential is formed on the panel for 50 to 60 seconds at a voltage of 12 to 14 kV to be formed, and the mask is closed and then exposed to 450 to 500 lux for 3 to 4 seconds using a mercury lamp or the like. After exposure, the red phosphor material is applied by a spray or the like and subjected to an assumption. After that, the process from the surface potential formation to the anchoring is repeated to form a blue phosphor. Since the panel in which the red and blue phosphors are formed is in a state where the surface potential is high due to the remaining potential, the green phosphor is prevented from forming by the repulsive force due to the remaining potential when forming the green phosphor. Becomes small, and brightness falls. Therefore, in order to form the green phosphor, a panel having red and blue phosphors is charged at a voltage of 12 to 14 kV for 50 to 60 seconds to form a surface potential, and 0.3 to 0.5 seconds to 250 to 300 lux using a mercury lamp or the like. The surface potential is lowered to reduce the surface potential, and then the mask is removed, exposed to 450 to 500 lux for 3 to 4 seconds, the green phosphor material is applied, and the fixing is performed to form green phosphor dots. Finally, these phosphors are fixed, a filming solution is applied to form an intermediate film, and then an aluminum (Al) film is deposited to prepare the fluorescent film of the present invention.

Preferred Embodiment

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention showing the constitution and effects of the present invention, and the present invention is not limited to the following examples.

Example 1

A 15-inch panel with a black matrix for cathode ray tubes manufactured by a dry electrophotographic method and a phosphor were formed on the panel at a voltage of 14 kV for 60 seconds to form an electrostatic bond. Exposure was carried out for 3 seconds using a mercury lamp. After exposure, the red phosphor material was applied by spraying or the like, and the fixing was carried out at a temperature of about 70 ° C. using acetone as the fixing solution. Subsequently, the process from surface potential formation to home fixation was repeated to form a blue phosphor, and then a panel on which red and blue phosphors were formed was charged at a voltage of 14 kV for 60 seconds to form a surface potential to form a green phosphor. After using the 300 lux mercury lamp, the surface potential was lowered by lowering the surface potential by 0.5 seconds, the mask was removed, the light was exposed for 3 seconds using the 500 lux mercury lamp, the green phosphor material was applied, and the hypothesis was carried out. Was formed. Finally, these phosphors were fixed, a film was applied to form a film to form an intermediate film, and an aluminum (Al) film was deposited to prepare a fluorescent film for color cathode ray tubes of the present invention.

Comparative Example 1

A fluorescent film for a color cathode ray tube was manufactured in the same manner as in Example 1 except that the entire surface was exposed in the process of forming the green phosphor after the red and blue phosphors were formed.

As can be seen in Figure 1, the third phosphor dot of the fluorescent film produced by the fluorescent film manufacturing method of the present invention has a fullness compared to the third phosphor dot of the fluorescent film manufactured by the conventional method of Figure 2, the emission luminance of the fluorescent film It can be seen that greatly improved. In particular, it can be seen that the luminance of the green phosphor is remarkably improved by more than 37% compared with the related art.

Claims (4)

Forming a first phosphor dot by forming a conductive layer and a photoconductive layer on a cathode ray tube panel having a black matrix, charging the panel, exposing the light, applying a first phosphor material, and developing the first phosphor dot. Forming a second phosphor dot on a portion where the first phosphor dot is not formed by charging, exposing the panel, applying a second phosphor material, and developing the panel on which the first phosphor dot and the second phosphor dot are formed. Forming a third phosphor dot on a portion where the first phosphor dot and the second phosphor dot are not formed by charging, exposing, applying a third phosphor material, and developing the first phosphor dot, the second phosphor dot and In the manufacturing process of the fluorescent film further comprising the step of fixing the panel on which the third phosphor dot is formed, the first phosphor dot and the second phosphor dot are And charging the formed panel and then exposing the entire surface. The method of manufacturing a fluorescent film according to claim 1, wherein after exposing the panel on which the first phosphor dot and the second phosphor dot are formed, the entire surface exposure is performed for 0.3 to 0.5 seconds using an optical lamp of 250 to 300 lux. The method of claim 1, wherein the first phosphor material and the second phosphor material use red or blue phosphor materials, and these are not used in overlapping with each other. The fluorescent film manufactured by the manufacturing method of any one of Claims 1-3.