KR20020037895A - The boundary structure of screen for multi deflection CRT - Google Patents

Abstract

PURPOSE: A screen boundary structure for multi-deflection CRT is provided to eliminate the necessity of separately manufacturing a vertical barrier rib, while preventing damage of panel during manufacture. CONSTITUTION: A screen boundary structure comprises a panel(11) coupled with a funnel(12) so as to form a tube and maintain the interior of a color CRT at a vacuum state; a phosphor layer(13) coated to the inner surface of the panel, and which emits a visible ray; a shadow mask(14) arranged at the front surface of the phosphor layer, and which selects color by selectively passing electron beam; and a barrier rib part(12a) arranged in a vertical direction at the screen boundary with a predetermined spacing from the shadow mask into the tube, wherein the barrier rib part has both ends of the same size. Since the barrier rib part is manufactured integrally with the funnel, the necessity of separately manufacturing a vertical barrier rib is eliminated.

Description

The boundary structure of screen for multi deflection CRT

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to cathode ray tubes, and more particularly, to a screen boundary structure in which a multiple deflection cathode ray tube provided with a plurality of electron guns and a deflection yoke is used to process a boundary on an image overlapping screen by an electron beam.

Image display devices that display information in modern life can be said to be invaluable. For example, T.V. or computer monitors are innumerable.

Such an image display device includes a cathode ray tube, an LCD, and the like. The most popular device is a cathode ray tube. The cathode ray tube hits a fluorescent material coated on a screen by an electron beam shot from an electron gun. It is a device configured to emit color from fluorescent materials.

However, such a cathode ray tube is an apparatus for forming an image by hitting an electron beam, and has a disadvantage in comparison with other apparatuses such as difficult to make a certain size or more in the size of the screen due to the difficulty of controlling the electron beam or forming a glass tube.

However, as the standard of living of citizens rises, more and more information needs to be displayed at the same time, and more people need to be able to watch clear screens from afar, such as in meetings or public places. The need for screens is increasing.

As the demand for large screens increases, a multi-deflection cathode ray tube has been developed in order to realize high image quality while exceeding the electron beam emission limit of the electron gun (Japanese Patent Laid-Open No. 9-320498).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram schematically illustrating the conventional multi-deflection cathode ray tube.

Referring to FIG. 1, the conventional multi-deflection cathode ray tube has a configuration substantially the same as that of a general cathode ray tube, but includes a plurality of electron guns and a deflection yoke, and features a funnel.

The configuration and operation of such a conventional multi-deflection cathode ray tube will be described in more detail.

The multi-deflection cathode ray tube includes a panel 11 provided at the front side to form an image, a funnel 12 sealed to the rear side of the panel 11 to make an inner tube into a vacuum space, and the panel 11 Supporting the phosphor layer 13 painted on the inner surface, the shadow mask 14 provided on the front surface of the phosphor layer 13 to selectively pass an electron beam for color selection, and the fraud shadow mask 14 Frame 15 provided at the rim, a spring 17 for fixing the frame, a stud pin 16 provided in the panel 11 to fix the spring to the funnel 12, and the funnel 12 An electron gun 18 provided at approximately the rear of the electron beam 18 to generate an electron beam, an electron beam 20 generated by the electron gun 18 to collide with the phosphor layer 13 to produce visible light, and a deflection yoke 19 to deflect the electron beam. ), And feed back from the inner tube It comprises a collector 22, which detects the collection of the reflected light.

Among the above configurations, in particular, the role of the collector of FIG. 1 will be described with reference to FIG. 2, which is an enlarged view of the section A of the panel.

The panel 11 is provided on the outermost side as a front glass, and a black matrix 13a to which graphite is coated on the inner surface of the panel 11 in order to improve contrast and emission luminance, and the black matrix 13a. Between the fluorescent materials 13d of R, G, and B colors are alternately applied repeatedly, and the inner surface of the fluorescent material 13d is made of aluminum (Al) as a main component and becomes electrons reflected by the fluorescent material. The metal bag 13b is provided to bounce the fluorescent material again to further increase the brightness of the screen, and the index signal phosphor layer 13c which generates a predetermined signal light when electrons collide on the inner surface of the metal bag 13b. These are provided at intervals from each other.

Looking at the operation through the above configuration, the electron beam 20 emitted from the electron gun 18 is hit by the fluorescent material (13d) emits three colors of red, green, blue, one in a multi-deflection cathode ray tube It is designed to limit the range that the electron beam emitted from the electron gun can strike, and the electron beam beyond this range also strikes the fluorescent material to which another electron beam must collide, resulting in a color different from the intended color of the fluorescent material. As a result, a problem arises that the image is degraded without obtaining the intended screen at the boundary where each electron beam is hit.

In order to solve this problem, the signal light emitted from the index signal phosphor layer 13c is collected by the collector 22 mounted outside the cathode ray tube, so that the signal light that is incorrectly generated due to the electron beam that is not incident correctly is By generating a corresponding control signal, the blow error of the electron beam is corrected.

However, the screen boundary structure in the conventional multi-polarization cathode ray tube as described above has a number of problems. In detail, the index signal phosphor layer 13c is first formed on the upper surface of the metal back 13b to be adjacent to each other. And a process of condensing the fluorescent light generated by the electron beam 20 hitting the fluorescent material 13d and the light appearing hitting the index material of the index signal phosphor layer 13c to disturb each other to condense on the collector 22. In the collector 22 is confused, and consequently the control signal is wrong.

In addition, since the index signal phosphor layer 13c is formed on the soft metal back 13b, damage to the metal back 13b may be caused in the process of forming the index signal phosphor layer 13c, and the metal back 13b may be caused. ) Has the disadvantage of consequently degrading the screen characteristics.

In addition, a method of using a vertical bulkhead in addition to the method of using the index signal phosphor 13c and the collector 22 has been proposed, which will be described in detail with reference to FIG. 3.

3 is a schematic structural diagram of a multiple deflection cathode ray tube in which a vertical bulkhead is used.

Referring to FIG. 3, a multi-deflective cathode ray tube in which a conventional vertical bulkhead is used provides a separate vertical bulkhead structure running from the funnel 12 on the boundary line of the screen so that each electron gun 18 strikes the fluorescent material 13. The electron beam beyond the range of) is not allowed to pass, thereby maintaining the image quality of the boundary line screen clearly.

However, the multi-deflection cathode ray tube in which the vertical bulkhead 30 is used has a structure called the vertical bulkhead 30 in addition to the main components consisting of the panel 11 and the funnel 12. Disadvantages are generated, and in order to effectively block unnecessary electron beams, the vertical bulkhead 30 is sharply processed so that the end of the vertical bulkhead 30 is almost in contact with the fluorescent material 13. ) May damage the panel 11 made of glass by touching the panel 11 to which the fluorescent material 13 is applied.

The screen boundary structure of the multi-deflection cathode ray tube according to the present invention was created to improve the above problems, and an object of the present invention is to propose a structure that can more easily obtain a clearer picture boundary.

1 is a diagram schematically illustrating a conventional multi-deflection cathode ray tube.

2 is a cross-sectional view of a conventional multi-deflection cathode ray tube panel.

3 is a schematic illustration of another conventional multi-deflection cathode ray tube;

4 is a schematic illustration of a multiple deflection cathode ray tube according to the present invention;

5 is an enlarged view illustrating portion A of FIG. 4 in more detail.

<Description of the symbols for the main parts of the drawings>

11 ............. Panel 12 ............... Funnel

13 .............. Phosphor layer 14 ............... shadow mask

15 .............. Frame 16 ............... Stud pins

17 .................. Spring

18 .................. Electron gun 19 ............... deflection yoke

20, 20a, 20b .... electron beam 22 ............... collector

30 .............. Vertical bulkhead 12a .............. Partial bulkhead

In order to achieve the above object, a multi-deflection cathode ray tube according to the present invention is sealed with a funnel to form a tube to maintain the inside of the color cathode ray tube in a vacuum, and a phosphor layer applied to the inner surface of the panel to emit visible light And a shadow mask for selecting a color spaced from the phosphor layer to the inside of the tube, and a partition wall portion provided perpendicular to the screen boundary at a predetermined interval from the shadow mask to the inside of the tube and having both ends having the same size. It features.

4 is a schematic structural diagram of a multiple deflection cathode ray tube according to the present invention.

Referring to FIG. 4, the multi-deflection cathode ray tube is a panel 11 provided at the front side to form an image, and a funnel sealed to the rear side of the panel 11 to make the inner tube vacuum. 12), a phosphor layer 13 painted on the inner surface of the panel 11 to give color, and a shadow mask 14 provided on the front surface of the phosphor layer 13 to selectively pass an electron beam to color discrimination; And a frame 15 provided at an edge to support the fraudulent shadow mask 14, a plurality of electron guns 18 provided on the rear surface of the funnel 12 to generate an electron beam, and the electron guns 18. And an electron beam 20 that collides with the phosphor layer 13 to produce visible light.

In the present invention, the funnel 12 plays a role corresponding to the vertical bulkhead 30 of the conventional multi-deflection cathode ray tube, and the barrier part 12a is the funnel 12 to reduce manufacturing difficulties. The end portion is not particularly sharply processed in a state of being integrally formed with the C1, and is formed to have a constant size, and in the shadow mask 14, a hole through which an electron beam passes is processed in a state of being blocked at a screen boundary.

By taking the above configuration, the conventional vertical bulkhead (refer to 30 in FIG. 3) can be reduced to the operational complexity of manufacturing separately from the panel 11 and the funnel 12, and also the shadow mask 14 Since the screen boundary is manufactured in a blocked state, it is possible to more reliably block the electron beam beyond the other area.

FIG. 5 is an enlarged view of a portion A of FIG. 4.

Referring to FIG. 5, in the multi-deflection cathode ray tube according to the present invention, the partition wall portion 12a is not narrowed even at the end of the partition wall, maintains the original width as it is, and is not fixed to the shadow mask 14. It can be seen that the shadow mask 14, which maintains the interval and corresponds to the screen boundary, remains without an electron beam passing hole.

With such a configuration, the electron beam 20a, which must be correctly passed at the screen boundary to emit the phosphor layer 13, passes through the shadow mask 14 to emit fluorescent material, but exceeds the area of the other electron beam. The invading electron beam 20b is not caught by the partition 12a having a predetermined width as in the related art, and thus cannot penetrate the light emitting region corresponding to the other region.

Thus, in the present invention, the partition wall portion 12a is not formed long enough to pass through the shadow mask 14 to reach the phosphor layer 13, and is provided inside the shadow mask 14, but the width W of the end portion is provided. In contrast to the conventional sharply processed method, it is widely formed, thereby effectively blocking the electron beam 20b that invades another region without processing the partition 12a to reach the phosphor layer 13.

On the other hand, the end width W of the partition 12a, the end D of the partition 12a, and the distance D to the shadow mask 14 are the distances to the shadow mask 14 and the phosphor layer 13 ( Among the electron beams 20 generated by Q) and the individual electron guns, the outermost electron beam 20b that strikes the correct phosphor is appropriately selected within an unaffected range.

As described above, the screen boundary structure of the multi-deflection cathode ray tube according to the present invention can reduce the inconvenience of having to separately manufacture the vertical bulkhead by manufacturing the partition wall integrally when manufacturing the funnel, and the end of the partition wall has a shadow mask. By placing a certain interval between them, it is possible to effectively prevent the panel from being damaged by the impact during the production or external impact.

Claims (3)

A panel sealed with the funnel to form a tube to maintain the interior of the color cathode ray tube in vacuum; A phosphor layer coated on an inner surface of the panel to emit visible light; A shadow mask for selecting a color spaced apart from the phosphor layer in the tube; Screen boundary structure of the color cathode ray tube, characterized in that consisting of a partition wall portion is provided perpendicular to the screen boundary at a predetermined interval from the shadow mask to the inside of the tube and both ends are formed in the same size. The method of claim 1, The shadow mask is a screen boundary structure of a color cathode ray tube, characterized in that the hole is passed through the screen on the screen boundary so that the electron beam does not pass through the screen boundary is blocked. The method of claim 1, Screen partition structure of the color cathode ray tube, characterized in that the partition wall is formed integrally with the funnel to facilitate processing.