KR20040018812A - Method for Fluorescent Screen of CRT and Device for The Same - Google Patents

Abstract

PURPOSE: A method for forming a fluorescent screen of a CRT and an apparatus thereof are provided to simplify processes and reduce a defect, while improving productivity and yield rate. CONSTITUTION: A method for forming a fluorescent screen of a CRT comprises a step of depositing a line type black matrix with a predetermined space on the inside of a panel, and a step of depositing green, blue, and red fluorescent substance with a predetermined pattern between black matrix lines. An apparatus for forming a fluorescent screen comprises a fluorescent substance cartridge(10), a head(20), a horizontal moving unit(30), a vertical moving unit(40), and a controller(50). A green, a blue, and a red fluorescent substance are separately stored at the fluorescent substance cartridge, respectively. The head is installed at the entrance of the fluorescent substance cartridge and includes a nozzle for spraying the fluorescent substance at an end portion. The horizontal moving unit moves the cartridge in a horizontal direction. The vertical moving unit moves the horizontal moving unit or the cartridge in a vertical direction. The controller controls an operation of the head and adjusts width, thickness, and gap of the fluorescent substance.

Description

Method for forming fluorescent surface of cathode ray tube and its device {Method for Fluorescent Screen of CRT and Device for The Same}

The present invention relates to a method and apparatus for forming a fluorescent surface of a cathode ray tube, and more particularly, to form a fluorescent surface using an inkjet printing method, which can simplify the production process, improve productivity and yield, and reduce costs. A fluorescent surface forming method and apparatus thereof are provided.

In general, the cathode ray tube is composed of a neck portion in which an electron gun is installed, a panel in which a shadow mask and a fluorescent surface are installed, and a funnel in which a deflection yoke is installed on an outer circumferential surface thereof. The cathode ray tube realizes a predetermined image by passing the shadow mask while impinging the electron beam emitted from the electron gun by the deflection magnetic field generated by the deflection yoke, and then impinging the phosphor by emitting light on the fluorescent surface.

The fluorescent surface is formed by applying green, blue, and red phosphors in a predetermined order with a black matrix BM interposed therebetween and being applied to the inner surface of the panel.

Conventionally, as a method of forming a fluorescent surface, an electrophotographic method consisting of a phosphor coating-drying-exposure-developing process is mainly used. That is, the fluorescent surface is formed by repeating the above-mentioned phosphor coating-drying-exposure-development process three times for each phosphor of green, blue and red.

The conventional method of forming a fluorescent surface is a complicated process, takes a long time for production, and poor productivity.

In addition, it is difficult to control each process, and the defect rate is high, because it is possible to maintain a certain quality by maintaining certain conditions (temperature, specific gravity, viscosity, speed, etc.) for each process.

In addition, according to the conventional method of forming a fluorescent surface, energy and resources such as industrial water and electricity are consumed, the cost of maintaining a large number of facilities is excessive, a large installation space is required, and this increases the manufacturing cost. It is a factor.

An object of the present invention is to solve the above problems, to provide a method for forming a fluorescent surface of a cathode ray tube that can greatly reduce the manufacturing cost by improving the productivity and yield rate by reducing the process and reducing various production costs and production equipment It is to.

In addition, another object of the present invention is to easily form a fluorescent surface on the inner surface of the panel by applying an inkjet printing method to simplify the process and to provide a fluorescent surface forming apparatus of a cathode ray tube that can improve productivity and yield will be.

1 is a process block diagram showing an embodiment of a method for forming a fluorescent surface of a cathode ray tube according to the present invention.

2 is a cross-sectional view illustrating a state in which a black matrix is formed on a panel.

3 is a partially enlarged cross-sectional view illustrating a state in which a fluorescent surface is formed on a panel.

4 is a cross-sectional view schematically showing an embodiment of a fluorescent surface forming apparatus of a cathode ray tube according to the present invention.

According to the present invention, a method of forming a fluorescent surface of a cathode ray tube includes applying a linear black matrix at predetermined intervals to an inner surface of a panel, and forming a green, blue, and red phosphor in a predetermined pattern between the black matrix lines by inkjet printing. Applying step.

The present invention proposes a fluorescent surface forming apparatus of a cathode ray tube, in which a green, blue, and red phosphor are separated and stored, and a nozzle is installed at an inlet of the phosphor cartridge and a nozzle is sprayed at an end thereof. A head, a horizontal shifting device for moving the phosphor cartridge in a horizontal direction, a vertical shifting device for moving the phosphor cartridge or a horizontal shifting device in a vertical direction, and a width of a phosphor applied by controlling the operation of the head And a control unit for adjusting thickness, interval, and the like.

It is also possible to adjust the number of lines of the fluorescent substance to be applied simultaneously in one movement by providing approximately 2 to 8 heads.

In addition, the apparatus for forming a fluorescent surface of a cathode ray tube according to the present invention further includes an air pump stirring apparatus installed in the above-described phosphor cartridge and stirring to prevent precipitation or solidification of the phosphor particles stored therein.

Next, a method of forming a fluorescent surface of a cathode ray tube according to the present invention and a preferred embodiment thereof will be described in detail with reference to the drawings.

First, an embodiment of the method of forming a fluorescent surface of a cathode ray tube according to the present invention, as shown in FIG. And applying a red phosphor in a predetermined pattern between the black matrix lines (S20).

As shown in FIG. 2, the black matrix is formed in a pattern (a <b) in which the distance between the black matrix lines 4 gradually increases from the center side of the panel 2 toward both edges.

In the step of applying the phosphor (S20), as shown in Figure 3, the green (G), blue (B), red (R) is made to apply simultaneously in a set, the phosphor slurry through a nozzle It is made by the inkjet printing method by spraying and applying.

After applying the phosphor as described above, a lacquer or filming step (S30) is performed to form a flat surface to exhibit the mirror effect of the deposited aluminum film.

Next, a preferred embodiment of the apparatus for forming a fluorescent surface of a cathode ray tube according to the present invention, which is used to perform inkjet printing in the above-described phosphor coating step (S20), will be described.

As shown in FIG. 4, the fluorescent surface forming apparatus of the cathode ray tube according to the present invention includes a phosphor cartridge 10 in which green, blue, and red phosphors are separated and stored, and the phosphor cartridge 10 of FIG. A head 20 installed at an inlet side and a nozzle 22 for injecting a phosphor at an end thereof, a horizontal moving device 30 for moving the phosphor cartridge 10 in a horizontal direction, and the horizontal moving device It includes a vertical moving device 40 for moving the 30 in the vertical direction, and a control unit 50 for adjusting the width, thickness, spacing, etc. of the phosphor to be applied by controlling the operation of the head 20.

By providing approximately 2 to 8 heads 20 as described above, the number of lines of the phosphors applied simultaneously in one movement can be adjusted. In other words, green (G), blue (B), and red (R) phosphors are applied in one set at the same time in one head 20. As the number of heads 20 is increased, the number of lines increases by one set. This is improved.

In addition, one embodiment of the fluorescent surface forming apparatus of the cathode ray tube according to the present invention is installed in the above-described phosphor cartridge 10 and the air pump stirring device 60 for stirring to prevent precipitation or solidification of the phosphor particles stored therein It includes more.

The air pump agitator 60 is for preventing the precipitation and coagulation of heavy phosphor particles in the slurry stored in the phosphor cartridge 10, the phosphor particles by continuously injecting air of a predetermined pressure to the phosphor cartridge 10 It is made to stir completely.

The horizontal moving device 30 and the vertical moving device 40 can be implemented using an LM guide system generally used in an automated facility.

As shown in FIG. 4, the vertical movement device 40 may be configured to move the horizontal movement device 30 provided with the phosphor cartridge 10 up and down, and to the above-described horizontal movement device 30. It is also possible to arrange so that the fluorescent substance cartridge 10 can be installed and moved up and down directly.

The control unit 50 detects this through a sensor (not shown) when the panel 2 is transported by a conveying device 70 made of a conveyor or the like and stopped at a fixed position by the fixing jig 80. The control signal is transmitted to the head 20.

In addition, the controller 50 recognizes the width and spacing of the black matrix line 4 applied to the panel 2 (recognized using a sensor or a CCD camera) to apply the black matrix line 4 to the width. It is also possible to configure the space so that the phosphor is not applied.

In the control section 50, the width and the interval of the applied phosphor can be adjusted by controlling the injection angle of the phosphor injected from the nozzle 22 (the inclination angles of the head 20 and the nozzle 22 described above). The thickness of the applied phosphor can be adjusted by controlling the injection amount of the phosphor injected from the nozzle 22.

The vertical movement device 40 and / or the horizontal movement device 30 is configured to move vertically and / or horizontally (front, rear, left, right) according to the control signal of the controller 50.

The phosphor cartridge 10 is configured to store three phosphors in one set of three cartridges storing green (G), blue (B), and red (R) phosphors, or separated into three zones.

In addition, the phosphor cartridge 10 is configured to be replaceable and refillable during application. For example, although not shown in the drawing, it is also possible to configure the phosphor slurry to be supplied as necessary by using a hose or tube provided with an on / off valve from the tank in which each phosphor slurry is stored to the phosphor cartridge 10.

The nozzle 22 of the head 20 is preferably formed into a hole having a size of about 170 to 250 μm so that no clogging occurs when the phosphor slurry containing phosphor particles of 2 to 12 μm is applied.

Next, the fluorescent surface forming process according to an embodiment of the fluorescent surface forming apparatus of the cathode ray tube according to the present invention configured as described above will be described.

First, when the panel 2 on which the black matrix line 4 is formed in a predetermined pattern by the transfer device 70 is transferred and fixedly supported at a predetermined position by the fixing jig 80, the controller 50 detects this. Transmit a control signal to start the application of the phosphor. At this time, the phosphor cartridge 10 is positioned in the standby position on the outside of the panel 2 by the vertical transfer device 40 and the horizontal transfer device 30 to be in a ready state, and a control signal is transmitted to start application. When the ready state is checked, the nozzle 22 is washed.

The control unit 50 transmits a predetermined print pattern signal to the head 20, and the vertical movement device 40 and the horizontal movement device 30 operate according to the control signal of the control unit 50 to operate the phosphor cartridge ( 10) is positioned at the starting point above the panel 2, and the phosphor moves from the nozzle 22, and the horizontal shifting device 30 operates so that the green, blue, and red phosphors are interposed between the black matrix lines 4. It is applied in turn at intervals.

When the coating is performed as described above and the phosphor is applied to the entire surface of the panel 2, the phosphor injection is stopped from the nozzle 22, and the horizontal transfer device 30 and the vertical transfer device 40 operate to operate the phosphor. The cartridge 10 is moved to the ready position and is ready for washing the nozzle.

In the above, a method for forming a fluorescent surface of a cathode ray tube according to the present invention and a preferred embodiment thereof are described. It is possible to implement, and this also belongs to the scope of the present invention.

According to the method and apparatus for forming a fluorescent surface of a cathode ray tube according to the present invention as described above, since the fluorescent slurry of green, blue, and red is sprayed simultaneously through a nozzle to form a fluorescent surface by forming a fluorescent surface, the process is simple. And the likelihood of failure is reduced. Therefore, productivity and yield are greatly improved.

In addition, according to the method and apparatus for forming a fluorescent screen of a cathode ray tube according to the present invention, the space required for the equipment for forming the fluorescent screen is greatly reduced compared to the conventional electrophotographic method, and the cost and equipment required for the maintenance of the equipment Energy, industrial water, etc. for operation are reduced.

In addition, since the consumption of the phosphor slurry is reduced and the film defective rate is reduced, the material cost is greatly reduced.

Claims (5)

Applying a linear black matrix on the inner surface of the panel at predetermined intervals; And Applying green, blue, and red phosphors in a predetermined pattern between black matrix lines by inkjet printing; Method of forming a fluorescent surface of the cathode ray tube comprising a. A phosphor cartridge in which green, blue and red phosphors are separately stored; A head installed at an inlet side of the phosphor cartridge and having a nozzle installed at an end thereof to inject a phosphor; A horizontal moving device for moving the phosphor cartridge in a horizontal direction; A vertical moving device for moving the horizontal moving device or the phosphor cartridge in a vertical direction; And Control unit for controlling the operation of the head to adjust the width, thickness, spacing of the applied phosphor Fluorescent surface forming apparatus of a cathode ray tube comprising a. The method of claim 2, A fluorescent surface forming apparatus for a cathode ray tube provided with two to eight heads. The method of claim 2, And an air pump agitation device installed in the phosphor cartridge and agitating to prevent precipitation or solidification of the phosphor particles stored therein. The method of claim 2, The nozzle of the head is a fluorescent surface forming apparatus of a cathode ray tube formed by a hole of 170 to 250㎛ size.