KR20010104555A - Method of manufacturing a plane Broun tube - Google Patents

Abstract

The present invention simplifies the manufacturing process of the flat CRT and enables cost reduction through reduction of materials and processes, as well as improving production yield by removing mechanically unstable elements, and shortening production time and simplifying through process improvement. The present invention relates to a flat CRT manufacturing method capable of manufacturing a flat CRT, and a conventional method has a large defect rate due to a process problem.

In the present invention, in producing a flat CRT, a screen manufacturing process (S1) for producing a screen panel 100 using a screen printing method; A mask assembly (110) fabrication process (S2) of stretching the shadow mask (112) to the rectangular frame (111) and welding with a laser; A mask assembly and a funnel bonding process (S3) for bonding the mask assembly 110 described above to the funnel 120 using the laminated glass 140; The panel 100 and the shadow mask assembly 110, the screen formed as described above is a panel and funnel bonding process for bonding the funnel 120 is laminated using a laminated glass 140, a complex process It is simple and simple to manufacture. It is possible to reduce the cost by eliminating materials and processes, as well as to significantly reduce the total production time, increase the production volume, and improve the production yield. This is a useful technique that can be done easily.

Description

Method of manufacturing a plane Broun tube

The present invention relates to a method for manufacturing a flat CRT, more specifically, to simplify the manufacturing process of a flat CRT and to reduce costs through reduction of materials and processes, and to improve production yield by removing mechanically unstable elements. In addition, the present invention relates to a flat CRT manufacturing method capable of shortening the production time and simply manufacturing a flat CRT through process improvement.

The conventional flat CRT includes a flat panel 10 having a light absorption layer and a fluorescent film 11 coated on an inner surface thereof, as shown in FIG. 5; A metal rail 30 having a rectangular frame shape that is fixed to the panel 10 by a resin paper and bonded to a safety glass for maintaining the explosion-proof characteristics of the CRT and a frit glass on the rear surface of the panel 10; The shadow mask 40, in which numerous voids or circular beam-passing holes 41 are drilled to fix the color of the electron beam, is fixed in a state in which a tension force is applied to the rail 30, and a frit is provided behind the panel 10. The neck portion 51 joined by the glass is encapsulated in the funnel 50 and the neck portion 51 of the funnel, and the electron gun 60 and the neck portion which emit electron beams of R, G, and B colors are formed. It is installed to surround the outer circumferential surface and consists of a deflection yoke 70 or the like for deflecting the electron beam.

In the planar CRT configured as described above, when power is applied to the cathode of the electron gun 60 and the electron beam 80 is generated, the generated R, G, and B electron beams are accelerated and connected while sequentially passing through the acceleration electrode and the connecting electrode of the electron gun. R, G, and B phosphors 11 applied to the inner surface of the panel 10 through the beam passage hole 41 of the shadow mask 40 in a state of being deflected in the horizontal or vertical direction by the magnetic field of the deflection yoke 70. ) And the phosphor 11 emits light accurately, so that the image is reproduced.

On the other hand, in the flat CRT, the metal rail 30 is bonded to the square frame shape fixed to the rear of the panel by the frit glass, and the four parts of the metal rail are connected and welded to each other by using a connecting material. After filling the glass and fixing it to the square jig, place the panel on the jig and pass the firing furnace to join the panel and the metal rail.

After joining the rails, the rails are ground using a machine to make the rails uniform.

On the other hand, in the plane CRT, a light absorption layer is formed on the inner surface of the panel to prevent diffuse reflection by external light and absorb external light, thereby forming a phosphor layer for reproducing an image thereon, and then emitting phosphor emission luminance. A resin film is formed on the phosphor layer to form a metal reflective film for increasing.

After the resin film is sufficiently dried, a white metal reflecting film is formed on the rear surface of the resin film using a deposition apparatus by vacuum deposition.

In the light absorbing film forming method, first, the inner surface of the panel is washed with a detergent, pure water, airborne, etc., and then the photosensitive agent is injected and dispersed evenly.

At this time, the photoresist in the liquid state is dried on the rail when the photoresist is crossed over. After drying to an appropriate temperature, light is irradiated on a uniform pattern, and then double exposure is performed to block the inner surface of the rail (effective screen portion) and irradiate light to the actual surface area.

Then, only the effective screen portion and the photosensitive agent which absorb light by developing with water and absorbing light by the photocuring action remain.

Then, the liquid containing the light absorbing material is injected, rotated at high speed, formed into a uniform film thickness, and dried.

In this case, too, the liquid of the light absorbing material is buried on the surface of the rail and dried.

After drying to an appropriate temperature, the etching solution is injected thereon, so that the etching solution penetrates into the film and absorbs light to cause a chemical reaction with the remaining photosensitive layer. Then, it is developed as water to form a light absorbing film having a certain pattern, and the light absorbing material on the surface is also removed through chemical reaction with the photosensitive layer in the developing process.

In the method of forming the phosphor layer and the resin film layer, in order to increase adhesion to glass on the already formed light absorbing layer, a liquid layer mixed with a photosensitive agent and a binder was formed to a uniform film thickness, dried, and then a phosphor, a photosensitive agent, and a dispersant were mixed with a green layer. Lari liquid is injected, evenly dispersed and rotated at high speed to form a uniform film thickness. At this time, even when the thread is carried over the rail, the thread is dried and dried. After drying to an appropriate temperature and irradiating light on a uniform pattern and developing with water, a green phosphor layer is formed. The blue and red phosphor layers are formed in the same process sequence.

In the resin film layer formation for forming the metal reflective film, the light absorbing layer, the green, blue, and red phosphor layers are formed, and then a resin solution is injected thereon to form a uniform film thickness and dried to form a resin layer.

In this case, too, the resin liquid is buried on the surface of the rail and dried.

After drying the resin liquid, a metal reflective film is formed by vacuum deposition.

Then, wipe off the dirt on the rails and seals, pull the shadow mask to the appropriate pressure on the rails and weld with a laser.

Thereafter, the panel portion completed by the above method and the funnel portion on the rear side thereof are joined by frits glass, and the CRT is manufactured through a plurality of processes.

Looking at the problems of the conventional flat CRT manufacturing method described above, when the rail is divided into four parts using a connecting material and welded by connecting the four parts to form a square frame rail assay, the rail warpage phenomenon and the squareness Defects are generated, workability is poor, and welding causes a decrease in production yield due to welding strength and strength.

In order to bond the square rail and glass, two kinds of frits are used to fill the fritted glass inside the rail. The reason is that the first glass filled with frit glass reduces viscosity to make bubbles easily fall out, and the second applied glass glass increases viscosity to make stacking easier. Stack and stack the glass. And the rail to which the application is completed should be left to allow sufficient time for bubbles to be released in the glassgrass.

If bubbles remain in the frit glass without remaining, a problem occurs that causes glass to be broken due to thermal expansion difference between the rail and the panel.

After sufficient waiting time, the rails filled with fritsgrass are fixed to the rectangular jig, and the panel is placed on it, and the panel and rail are joined by passing through the kiln.

At this time, the temperature schedule and the passing speed of the kiln are important factors, but if the temperature schedule is not correct, there is a problem in that the panel is broken due to thermal expansion and contraction speed difference between the rail and the panel.

In particular, the thermal expansion and contraction speeds of iron and glass are different, so precise temperature management is required. Also, if the passing speed is fast, the jig is shaken, and if the jig is shaken, the joint position of the panel and the rail is misaligned.

Therefore, the correlation between the temperature schedule and the passing speed should be well established, and if any one of the two conditions is misplaced, a fatal defect will occur.

After bonding the rail and the panel, the above-described light absorbing layer and the phosphor layer are formed, and the electron beam generated from the electron gun passes through the beam passing hole of the shadow mask to accurately hit the green, blue and red phosphor layers formed on the inner surface of the panel to emit the phosphor. The height of the rail must be kept constant.

To achieve this constant height, the rail must be polished using a grinding machine.

In order to meet the required degree of the rail requires a lot of polishing time, there is a problem that the failure caused by the failure and bending of the rail by the polishing strength.

Then, when the above-mentioned light absorbing layer is formed, the chemical reaction between the double exposure and the etching solution is used to remove the photoresist and the light absorbing material, but it is not completely removed. If the cleaning liquid splashes into the screen to cause defects and is not completely cleaned, there is a problem in that it is mixed with the threes and generates a foreign material defect.

In addition, when the phosphor layer is formed, there is a problem in that a thread is hardened on the real surface and the rail surface, causing exposure foreign material defects during exposure, and contaminating the exposure reference point (3 balls) attached to the side surface of the panel, so that the manual cleaning is performed before exposure.

And when the resin layer is formed, the resin liquid is fixed to the rail and the actual surface is hardened, but there is a problem that the resin liquid is not wiped well. If it is not completely removed, welding defects occur during shadow mask welding after metal reflective film is formed, and when the panel and funnel are fused with fritted glass, fusion does not occur. There is a problem that the production yield is lowered and the processing cost is increased.

And then look at the process of welding the shadow mask using a laser, first of all to clean the welding area so that the welding does not cause welding defects, when the cleaning liquid splashed into the inner surface of the panel, it may cause defects and did not clean completely If there is a problem of welding failure.

In addition, if foreign matter enters the inside of the panel during cleaning, foreign matter does not come out after the shadow mask welding, which causes fatal problems such as mask clogging and electron gun stray defect in the post-process.

In order to improve such a problem, the present invention improves the conventional flat CRT structure in the method of manufacturing a flat CRT, thereby simplifying and eliminating a complicated process, and attaching a rail to a panel by welding a shadow mask to the panel, thereby causing loss of materials and materials. Its purpose is to provide a flat CRT manufacturing method that can reduce cost, increase chemical output and yield by eliminating process defects and reducing chemical materials and water used in screen manufacturing.

1 is a manufacturing process flow chart of a flat CRT tube according to the present invention.

Figure 2 is a perspective view showing a mask assembly structure of the present invention.

Figure 3 is a cross-sectional view showing a bonding state of the mask assembly and the funnel of the present invention.

Figure 4 is a cross-sectional view showing the configuration of a flat CRT tube according to the present invention.

5 is a cross-sectional view showing the configuration of a conventional flat CRT.

* Description of the symbols for the main parts of the drawings *

100 panel 101: fluorescent film

110: shadow mask assembly

111: Frame 112: Shadow Mask

120: funnel 121: stepped portion

130: electron gun 131: electron beam

140: laminated glass 200: jig

In order to achieve the above object, the present invention provides a flat CRT, a screen manufacturing process (S1) for producing a screen panel 100 using a screen printing method; A mask assembly 110 fabrication process (S2) of fixing the shadow mask 112 by stretching the frame 111; A mask assembly funnel bonding step (S3) of bonding the mask assembly 110 described above to the funnel 120; The panel 100 and the shadow mask assembly 110 formed with the screen described above are characterized in that the panel and the funnel bonding process for bonding the funnel 120 bonded.

The frame 111 is approximately rectangular in shape, and the cross-sectional shape of the frame may be manufactured in the form of an L-shaped structure, a triangular structure, or a rectangular structure.

In addition, the mask assembly and the funnel bonding process (S3) is the bonding of the mask assembly and the funnel is different in the bonding direction according to the tension direction, the funnel 120 used in the mask assembly and funnel bonding process (S3) is the inner side in the opening side. It characterized in that formed in the shape having a stepped portion 121.

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

1 is a flow chart of the manufacturing process of a flat CRT according to the present invention can be roughly divided into four parts.

First screen manufacturing process (S1) is produced using a method of forming a screen using a printing method.

First, the inner surface of the panel is cleaned with a cleaning agent, and then the panel is mounted on a printing facility, a screen on which a graphite film pattern is formed is attached, and the graphite paste is pushed with a squeegee to form a graphite film and then dried.

After sufficiently drying, the panel is mounted on a printing facility with a screen on which a green fluorescent film pattern is formed, and the green paste is pushed through a squeegee to form a green fluorescent film on the panel and dried.

After sufficient drying, the blue and red fluorescent films are also formed in the same manner as described above.

Then, the film is formed on the printing equipment with a patternless front printable screen on the entire surface where the film is formed, and the resin film paste is pushed onto the squeegee to form the resin film on the front surface.

After sufficiently drying, a metal reflective film is formed on the resin film by vacuum deposition.

In addition, the metal reflecting film may be manufactured in the form of a metal paste and attached to a printing facility with a front printable screen without the above-described pattern to push the metal paste into a squeegee to form the metal reflecting film.

If the metal reflective film is formed using the printing method, the drying after printing may cause a fatal problem that the thermal expansion of the metal components in the metal paste causes cracking of the metal reflective film. Should be secured.

The most important factors in forming the graphite, green, blue, red fluorescent film, and metal reflective film described above using the printing method are the height of the screen mask and the panel.

The height described above determines the tension of the screen mask and determines the printing elements, such as the viscosity, squeegee speed and pressure of the paste.

Usually, the height is printed between 0.5 and 50 mm to achieve an appropriate level of coating properties.

The printing equipment of the above technique should be equipped with a camera that can read the identification mark engraved on the panel to ensure accurate positioning.

second; As a mask assembly fabrication process (S2), a process of fabricating a mask assembly as shown in FIG. 2 is performed by tensioning the shadow mask 112 with a suitable pressure so that the mask hole can be positioned at a desired position in the rectangular frame 111. Using to produce a shadow mask assembly 110.

The tension of the shadow mask 112 is a structure that is welded by stretching at least one axis.

The rectangular frame 111 may be manufactured in one piece or in a separate type.

However, the rectangular frame 111 should have the strength to overcome the tensile force of the shadow mask 112, itself should not be a bad straightness, and should be made of a rigid body that does not cause distortion, bending, etc. .

If the tensile strength of the shadow mask 112 is not overcome, there is a problem that the color of the electron beam and the fluorescent film from the electron gun do not coincide with the completion of the CRT.

The rectangular frame 111 may be manufactured in various forms, and the shape of the rectangular frame 111 may vary depending on the number of tension directions of the shadow mask 112.

If the structure is stretched in one axis, the rectangular frame shape is advantageous in terms of L structure or triangle structure, and in the case of structure stretching in two axes, triangle or square structure is advantageous.

third; As the bonding process of the mask assembly and the funnel (S3), the mask assembly 110 is bonded to the funnel 120, and the laminated glass 140 such as a frit is used in the funnel 120, as shown in FIG. 3. The mask assembly 110 is bonded to the funnel 120 by using a jig 200 of a rectangle that can be bonded while maintaining the height.

At the time of joining, the joining part should also change the direction of joining according to the number of tensile directions of the shadow mask 112.

If it is a structure that stretches in one axis, it must be joined in the tension direction.

The reason is to minimize the doming phenomenon occurring in the CRT and to prevent the cracks due to thermal expansion by absorbing itself by minimizing the bonding in consideration of the problems caused by the difference in thermal expansion between glass and metal.

In addition, the laminated glass 140 may be used by mixing a class of materials having a similar thermal expansion coefficient of the frame 111 and the thermal expansion coefficient of the glass, and have sufficient viscosity to be formed at a constant height when the laminated glass 140 is applied. do.

When the funnel 120 and the mask assembly 110 are bonded to each other, the mask assembly 110 is coated with the laminated glass 140 on the stepped portion 121 of the funnel 120 using the jig 200. Place the jig 200, which can maintain a uniform height thereon, is fixed on the mask assembly 110, and then passed through a calcination furnace to fuse the laminated glass 140.

If the bonding is not performed at a constant height, the electron beam 131 generated from the electron gun 130 and the fluorescent film 101 do not coincide with each other when the CRT is completed as described above.

fourth; As shown in FIG. 4, the funnel 120 to which the screen 100 and the mask assembly 110 are formed is bonded to each other to maintain a constant height using laminated glass 140 such as a frit. The same flat CRT structure is achieved.

The present invention is to form a graphite film, a fluorescent film, a resin film and the like through the screen printing method, the metal reflective film is formed by vacuum deposition or printing method on the screen, and the shadow mask is stretched to a desired position on a rectangular frame. A mask assembly is manufactured by welding with a laser, and the mask assembly is attached to a funnel to maintain a constant height, and then bonded using laminated glass such as frit.

After that, the panel formed with the fluorescent film and the shadow mask are bonded to each other to maintain a constant height with laminated glass such as frit to complete the panel 100 and the funnel 120 to be bonded. It is manufactured in the same way as the manufacturing process.

The present invention relates to a method for manufacturing a flat CRT, which can be easily manufactured by simplifying a complicated process, and can significantly reduce costs through material and process deletion, as well as greatly reduce the total production time, thereby increasing production and improving production yield. As a possible CRT manufacturing method, it is a useful technique that can simplify the manufacturing process of a flat CRT.

Claims (4)

In the manufacturing method of the flat CRT, A screen manufacturing process (S1) for producing the screen panel 100 using the screen printing method; A mask assembly 110 fabrication process (S2) of fixing the shadow mask 112 by stretching the frame 111; A mask assembly funnel bonding step (S3) of bonding the mask assembly 110 described above to the funnel 120; Method for producing a flat CRT, characterized in that the panel is formed of the panel 100 and the shadow mask assembly 110 is bonded to the panel and the funnel bonding process is bonded. The method of claim 1, The shape of the frame 111 is a flat CRT manufacturing method, characterized in that the substantially rectangular. The method of claim 1, The cross-sectional shape of the frame is a planar CRT manufacturing method characterized in that it can be produced in the form of L-shaped structure or triangular structure or square structure. The method of claim 1, The funnel 120 used in the mask assembly and the funnel bonding process (S3) is a planar CRT manufacturing method characterized in that it is made of a shape having a stepped portion 121 inwardly at the opening side.