KR19990031673A - Cathode ray tube screen and manufacturing method - Google Patents

Abstract

The present invention relates to a screen for a cathode ray tube in which a black matrix film is omitted and a method for manufacturing the cathode ray tube, wherein a variable transmission means is provided on the front surface of the panel, and a fluorescent film and an aluminum film are deposited on the surface of the variable transmission means to form a screen. do. The variable transmission means is provided as a variable transmission membrane having a property of changing the transmittance according to temperature, and accordingly the portion of the variable transmission membrane that faces the phosphor emitting light and radiates heat transfers the heat of the phosphor. On the other hand, the temperature rises and the transmittance increases, whereas the portion where the phosphor is not formed shows low transmittance due to the relatively low temperature. Therefore, by effectively transmitting the light of the phosphor to improve the contrast of the screen is provided as a simpler process has the effect of simplifying the entire screen manufacturing process.

Description

Cathode ray tube screen and manufacturing method

The present invention relates to a cathode ray tube screen and a method of manufacturing the same, and more particularly, to shorten the production line by providing an alternative means formed in a simpler process to perform the same function in place of the black matrix film formed in a complex process The present invention relates to a cathode ray tube screen and a method of manufacturing the same that can improve process efficiency.

Generally, the cathode ray tube forms a screen on the inner surface of the panel, which is a front glass, and inserts an electron gun into the neck portion of the funnel forming the rear body, and continuously scans the screen by firing an electron beam controlled by a screen signal from the electron gun. The principle is implemented.

The screen is composed of three colors of green, blue, and red phosphors and a black matrix film disposed in portions other than the phosphors. The screen is divided into a circular dot type and a comb-toothed stripe type. In computer monitors, the stripe type is used for color CRTs.

The green, blue, and red electron beams, starting with the electron gun mounted on the funnel, are matched in one beam through hole on the shadow mask, pass through them, and then split into three stems and land on the designated green, blue, and red phosphors. Will be implemented.

However, due to various factors affecting the landing characteristics such as the path change caused by the geomagnetism and the nonuniformity of the panel and shadow mask spacing, the electron beam may miss landing on the adjacent phosphor instead of the designated phosphor, thereby inhibiting clear color implementation. Graphite, which is a light absorbing material, is applied between the respective phosphors to not only absorb the mis-landing electron beam, but also to clearly distinguish between the phosphors, thereby improving contrast.

An aluminum film is vacuum-deposited on the surface of the phosphor and the black matrix layer, which re-reflects electrons reflected by the collision with the phosphor, thereby improving brightness of the screen, that is, brightness.

The cathode ray tube screen having such a configuration is generally divided into a black matrix film forming process, a phosphor forming process, an aluminum film deposition process, and the like, which will be described in more detail as follows.

The black matrix film forming process includes a resist solution applying step of applying a photoresist solution to the cleaned panel inner surface after performing a panel cleaning operation to remove foreign substances on the inner surface of the panel on which the screen is to be formed, and a resist applied by rotating the panel. A panel rotation step of uniformly dispersing the solution to the entire surface of the panel, an exposure step of drying the dispersed resist solution, mounting a shadow mask and exposing the UV light to cure a portion where the phosphor is to be placed, and an uncured part of the exposure step The black matrix film is removed by removing the resist film present on the bottom of the graphite film through a developing step of removing pure water, a graphite suspension coating step of applying a graphite suspension to the surface of the cured resist film, and drying the applied graphite suspension. Including finishing etching process Is done.

After forming a film by applying a primer to increase the adhesion of the phosphor to the surface of the black matrix film formed as described above, a phosphor forming process is performed. It consists of an exposure process and a process of developing, which is repeated in the order of green, blue and red phosphors.

And a filming solution is applied to the surface of the black matrix film and the phosphor, followed by drying to form a flat surface, followed by vacuum deposition of aluminum to form an aluminum film, and a firing process of burning and removing the filming solution and the polymer organic material through a firing furnace. Run to complete the screen.

The screen manufacturing process of the cathode ray tube made as described above has a problem that the process is very complicated and not only easy to manage the process, but also a rise in product price due to facility investment.

The mixture of the black matrix film and the uncured portion after the exposure process in forming the phosphor is removed by a developing process, and in particular, the photoresist solution used in forming the black matrix film is removed through developing and etching. Waste of the mixture removed through development and etching in the process can also be a serious problem.

Therefore, the present invention has been made to solve the above problems, the object of the present invention is to simplify the screen manufacturing process of the cathode ray tube made of a complex process as described above, for the cathode ray tube that can reduce the amount of waste mixture The present invention provides a screen and a method of manufacturing the same.

In order to achieve the above object, the present invention, three-color green, blue, and red phosphors having a fine size to the inner surface of the front glass is arranged adjacent to each other continuously and scanning the electron beam controlled by the screen signal to emit light color A variable transmissive means formed between the panel and the fluorescent film across the front panel and selectively transmitting only the light of the phosphor constituting the fluorescent film, and vacuumed to the front of the variable transmissive means and the fluorescent film to improve luminance Provided is a cathode ray tube screen comprising an aluminum film to be deposited.

The variable permeation means is made of a variable permeable membrane whose transmittance varies with temperature.

In addition, the present invention is a panel cleaning process for removing foreign matter to the inner surface of the panel, a variable permeable membrane forming process for forming a variable permeable membrane by applying a variable permeable membrane forming material to the cleaned inner surface of the panel and the variable permeable membrane surface Forming a mold film by applying and curing green, blue, and red slurries; an aluminum film deposition process of vacuum depositing an aluminum film on the surface of the variable permeable film and the fluorescent film to improve brightness; Provided is a method for producing a cathode ray tube screen comprising a predetermined step of burning and removing a firming solution, a polymer organic material, and the like.

Accordingly, the variable transmission means selectively transmits only the light emitted from the phosphor as the variable transmission means by changing the transmittance according to the temperature difference between the portion facing the phosphor and the portion facing the space except the phosphor.

Thus, by providing a variable transmission means that can be manufactured in a simpler process in place of the function of the black matrix film formed by a complex process, it is possible to simplify the screen manufacturing process to improve the process efficiency and lower the manufacturing cost.

1 is a cross-sectional view of a cathode ray tube screen according to the present invention.

Figure 2 is a detailed cross-sectional view of the cathode ray tube screen according to the present invention.

3 is a process flowchart of a method for manufacturing a cathode ray tube screen according to the present invention.

4 is a detailed process flowchart of the variable permeable film forming process of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a panel including a cathode ray tube screen according to the present invention, and the screen 4 is formed on the inner surface of the panel 2, which is the windshield.

The screen 4 includes a fluorescent film 8 in which three green, blue, and red phosphors 6 having minute sizes are successively arranged at predetermined intervals, the panel 2, and the fluorescent film 8. And a variable transmission means formed over the entire surface of the panel 2, and an aluminum film 10 deposited and formed on the entire surface of the fluorescent film 8 to form a flat surface.

In the fluorescent film 8, there are a dot type and a comb-shaped stripe type in which each phosphor 6 is circular, and both of them are scanned by an electron beam controlled by a screen signal. Thus, the phosphor 6 molecules are excited to emit an image while emitting light.

This is because a shadow mask which emits three colors of green, blue and red electron beams from an electron gun (not shown) mounted on the rear body of the cathode ray tube and is mounted in parallel with the panel 2 to the inside of the panel 2. Green, blue, and red phosphors of the same color as the electron beam after being matched in the beam through hole of one of the plurality of beam through holes (not shown) and separated into three stems again while passing through the beam through holes Landing in (6) is made.

Landing process as described above is the ideal implementation when the electron beam is accurately landed on the specified phosphor 6, but due to factors such as geomagnetic influence and electron beam scattering, some of the electron beam is landed out of the specified phosphor 6 Done.

Therefore, it is necessary to clearly distinguish between the phosphors 6 and to provide a material that does not emit light even when the electron beam is incident, thereby improving the contrast of the screen.

Providing such a function is a variable transmission means newly implemented by the present invention, which is formed between the panel 2 and the fluorescent film 8 across the front of the panel 2 and selectively light only the phosphor 6 It has a function of transmitting.

In other words, the light emitted from the phosphor 6 is transmitted to the panel 2, but the light of the portion where the phosphor 6 is not formed is blocked.

The variable permeation means of this principle is provided as a variable permeable membrane 12, the transmittance of which varies with temperature, the components of the variable permeable membrane 12 is 2.5 to 40% by weight of a polyether compound containing an ethylene oxide group, in the molecule 0-25 wt% wetting agent containing 5-10 ethylene oxide groups, 2.5-22.5 wt% water soluble solvent, 0.1-2 wt% carboxyvinyl polymer, 0.05-2 wt% base, 50-60 wt% water and optionally 2 wt% It is preferred to consist of components containing up to% conventional additives.

The component and the content rate of the variable permeable membrane 12 may be freely modified within the range according to the process conditions.

Referring to the function of the variable permeable membrane 12 made as described above in more detail, as shown in Fig. 2, the fluorescent film 8 is located on the surface of the variable permeable membrane 12, the fluorescent film 8 ) Is composed of three colors of green, blue and red phosphors 6 which are sequentially arranged at predetermined intervals.

When the phosphor 6 receives an electron beam (A arrow) corresponding to each phosphor 6, the kinetic energy of electrons constituting the electron beam is excited by the phosphor 6 molecules to be converted into the light energy of the phosphor 6. (6) emits light to realize an image. At this time, since the phosphor 6 generates heat energy together with light energy, the phosphor 6 emits heat to its surroundings as the temperature increases.

Usually, the temperature of the fluorescent film 8 which has been scanned with an electron beam is 100 ° C. or more, and since the luminous efficiency of the phosphor 6 increases when the temperature rises, a phosphor material having good temperature characteristics should be used.

As shown, the portion of the variable permeable membrane 12 facing the phosphor 6 receives the heat due to the heat dissipation of the phosphor 6 to increase the temperature, and the portion where the temperature rises is the variable permeable membrane ( According to the property of 12) the transmittance is increased to transmit the light emitted from the phosphor 6 to the panel (2). (B arrow)

At this time, the transmittance of the variable permeable membrane 12 facing the phosphor 6 is preferably made 95% or more.

The portion of the variable permeable membrane 12 that does not face the phosphor 6 is relatively less affected by the temperature rise caused by the phosphor 6 than the portion that faces the phosphor 6, and thus exhibits a relatively low transmittance. The transmittance of is preferably made less than 10%.

Accordingly, the variable permeable membrane 12 has a high transmittance at the portion facing the phosphor 6 according to the arrangement of the phosphor 6 so that light of the phosphor 6 and the phosphor 6 is not formed efficiently. By performing selective transmission to improve the contrast of the screen.

As shown in FIG. 1, the aluminum film 10 is vacuum-deposited on the surface of the fluorescent film 8, and the aluminum film 10 panels the electrons from the collision after landing on the phosphor 6 again. (2) It reflects toward the surface, thereby increasing the brightness of the screen, and serves to prevent the potential of the phosphor 6 from dropping by inducing excess electrons in the phosphor 6.

Cathode ray tube screen according to the present invention is made of the above configuration, next will be described a method for producing a cathode ray tube screen according to the present invention.

Figure 3 is a process flow chart showing a manufacturing process of the cathode ray tube screen newly implemented by the present invention, a panel cleaning step (P1) for removing foreign matter to the inner surface of the panel on which the screen is to be formed, and a variable permeable film formed on the cleaned inner surface of the panel A variable permeable film forming step (P2) of applying a solution to form a variable permeable film, a fluorescent film forming step (P3) of forming a fluorescent film by applying and curing a phosphor slurry on the surface of the variable permeable film, and aluminum on the surface of the fluorescent film And an aluminum film deposition step (P4) for vacuum deposition, and a firing step (P5) for burning and removing various organic substances through a calcination furnace.

The variable permeable film forming step (P2) is a coating step (S1) for applying a variable permeable film forming solution as shown in FIG. 4, and a panel rotation step of spreading the variable permeable film forming solution to a predetermined thickness by rotating the panel (S2) and a drying step (S3) of drying the inner surface of the panel to complete the variable permeable membrane.

The variable permeable membrane forming step (P2) is a variable permeable membrane forming solution prepared in consideration of viscosity characteristics in process conditions, that is, 2.5 to 40% by weight of a polyether compound containing an ethylene oxide group, 5 to 10 ethylene in a molecule 0 to 25% by weight wetting agent comprising an oxide group, 2.5 to 22.5% by weight aqueous solvent, 0.1 to 2% by weight carboxyvinyl polymer, 0.05 to 2% by weight base, 50 to 60% by weight water and optionally up to 2% by weight conventional additives The variable permeable membrane forming solution consisting of a component containing the coating is applied to the inner surface of the panel, the method of coating the variable permeable membrane forming solution into the inner surface of the panel through a feeder or using a sprayer to the panel Spraying to the inner surface;

After performing the coating step (S1) as described above, and performing a panel rotation step (S2) for rotating the panel, which is an extension process for evenly dispersing the variable permeable film forming solution applied to the inner surface of the panel over the entire panel, It consists of a feed light tablet for forming a uniform film thickness, etc., according to the state of the variable permeable film forming solution to properly adjust the progress time and rotation speed of the two processes to perform this process.

Next, the drying step (S3) is performed, which is to dry the variable permeable membrane forming solution having a uniform film thickness on the inner surface of the panel to complete the variable permeable membrane, such as a heating method by a heater and a blowing method using wind. It is a process of drying.

A variable permeable membrane is formed by performing the variable permeable membrane forming step (P2) as described above, and then a fluorescent film is prepared on the surface of the variable permeable membrane.

In the phosphor film forming step (P3), an undercoat liquid is applied to the surface of the variable permeable membrane to increase the adhesive strength of the phosphor, followed by drying and exposure to form an adhesion increasing film. Then, a rust phosphor slurry is applied to the inner surface of the panel, followed by drying, exposure, Development to complete a rust phosphor.

Then, they are applied in the order of blue phosphor and red phosphor, and then dried, exposed, and developed to complete all green, blue and red phosphors.

Applying a peeling solution to the surface of the green, blue, and red phosphors as described above to form a surface of the phosphor, which is deposited directly on the surface of the phosphor film that does not form a flat aluminum, the aluminum penetrates the phosphor It reduces the mirror effect of the aluminum film to fill the space between the phosphors in order to prevent this.

After the fluorescent film forming process (P3), the aluminum deposition process (P4) is performed next, by vacuum deposition, in which the metal or alloy is heated in vacuum to condense particles evaporated from the molten state onto the panel surface to form an aluminum film. Use the method.

Next, as the firing step (P5), the firing step (P5) is to burn and remove the undercoat liquid used to bond the filming solution and the phosphor used for the deposition of aluminum film, that is, the polymer organic matter, etc. The process consists of heating the panel through.

Through the above process to form a variable permeable film, a fluorescent film and an aluminum film on the inner surface of the panel to complete the screen.

As described above, the present invention provides a variable permeable film that can be manufactured in a simpler process in place of the black matrix film formed by a complicated process, thereby improving the contrast of the screen and shortening the manufacturing process of the cathode ray tube. .

Claims (5)

A fluorescent film having three colors of green, blue, and red phosphors having minute sizes on the inner surface of the panel, which are close to each other, continuously arranged to emit light by scanning an electron beam controlled by a screen signal; Variable transmission means formed between the panel and the fluorescent film over the entire surface of the panel and selectively transmitting only the light of the phosphor constituting the fluorescent film; A cathode ray tube screen comprising an aluminum film vacuum-deposited on the front surface of the variable transmission means and the fluorescent film to improve the brightness. The cathode ray tube screen according to claim 1, wherein the variable permeation means comprises a variable permeable membrane whose transmittance varies with temperature. The method of claim 2, wherein the variable permeable membrane is 2.5 to 40% by weight of a polyether compound containing an ethylene oxide group, 0 to 25% by weight of a wetting agent containing 5 to 10 ethylene oxide groups in the molecule, 2.5 to 22.5% by weight of a water-soluble solvent, A cathode ray tube screen comprising components containing from 0.1 to 2% by weight of carboxyvinyl polymer, from 0.05 to 2% by weight of base, from 50 to 60% by weight of water and optionally up to 2% by weight of conventional additives. A panel cleaning step of removing foreign matters to the inner surface of the panel; A variable permeable film forming step of applying a variable permeable film forming material to the cleaned inner surface of the panel to form a variable permeable film; Forming a mold-permeable film by coating and curing each green, blue, or red slurry on the surface of the variable permeable membrane; An aluminum film deposition process of vacuum depositing an aluminum film on the surfaces of the variable transmission film and the fluorescent film to improve brightness; A method for producing a cathode ray tube screen comprising a predetermined step of burning and removing a filming solution, a polymer organic material, etc. through a calcination furnace. The method of claim 4, wherein the variable permeable film forming process comprises: an application process for applying a variable permeable film forming material; A panel rotation step of rotating the panel to form a variable permeable film forming material with a uniform thickness; A method for manufacturing a cathode ray tube screen comprising a drying step of drying a variable permeable film-forming material applied using a heater, a blower, or the like.