JPH08106867A - Flat type image display device and its manufacture - Google Patents

Abstract

PURPOSE: To provide the structure of a cathode part realizing a flat type image display device realizing a highly precise image, and a manufacturing method thereof. CONSTITUTION: In a flat image display device in which a back plate 1, a linear cathode 3 as electron beam source, a drawing electrode, a signal electrode, a focusing electrode, a horizontally deflecting electrode, a vertically deflecting electrode and a screen plate are arranged and housed in a flat glass bulb vacuum inner part, the linear cathode 3 is buried in and fixed to a metal film 4, and a signal input terminal 21 is directly welded and connected to the metal film 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for video equipment.

[0002]

2. Description of the Related Art Heretofore, a cathode ray tube has been mainly used as a display element for displaying a color television image, but a conventional cathode ray tube has a longer depth than a screen,
It was impossible to make a thin television receiver. Recently, as a flat display element, an EL display element,
Although plasma display devices, liquid crystal display devices, etc. have been developed, they are all insufficient in terms of performance such as brightness, contrast and color reproducibility of color display.

Therefore, as a means for achieving a flat display device by using an electron beam, a new display device has been proposed in Japanese Patent Application Laid-Open No. 1-130453 (Japanese Patent Application No. 62-288762).

This is to divide the screen on the screen into a plurality of sections in the vertical direction, deflect the electron beam in the vertical direction for each section to display a plurality of lines, and further divide the section in the horizontal direction into a plurality of sections. Then, the R, G, and B phosphors are made to sequentially emit light for each section, and the irradiation amount of the electron beam to the R, G, and B phosphors is controlled by a color image signal. The television image is displayed.

FIG. 4 shows the internal structure of a conventional image display device. In FIG. 4, 501 is a back electrode, 502 is a line cathode as an electron beam source, 503, 504, 505, 50.
Reference numerals 6, 507, and 508 denote electrode units for extracting an electron beam from a line cathode, modulating, focusing, and deflecting the electron beam. These constituent parts are attached to the front container 509 and the back container 51.
It is housed in 0 and the inside of the container is evacuated.

The structure of the cathode portion as the electron beam source in FIG. 4 will be described with reference to FIG. The line cathode 601 is formed, for example, by coating an oxide cathode material 602 on the surface of a tungsten wire. The line cathode 601 is located between the back electrode 501 and the electrode 503 for extracting the electron beam in FIG. 4, and a plurality of line cathodes 601 are provided along the direction in which the electrode holes of the electrode 503 for extracting the electron beam are arranged. It has been suspended. In order to accurately position and extend the line cathode, an insulating support frame 603 is used, which allows the distance from the back electrode 501 and the extraction electrode 503 to be maintained accurately, and also the electron beam extraction electrode. The extending direction of the wire cathode 601 with respect to the arrangement direction of the electrode holes is also accurately maintained. This wire cathode is fixed to the support frame 603 via a metal spring 604, and a terminal 605 for inputting a signal is further joined via the metal spring 604.

[0007]

In the structure of the conventional cathode part, the wire cathode is stretched by using a metal spring. Therefore, in order to obtain the position accuracy of the wire cathode, an insulator made of high accuracy is required. A support frame is required. Therefore, when the screen size is increased, an increase in the manufacturing cost of this single component is unavoidable.

Further, in the structure for inputting a signal to each wire cathode, metal springs are attached to the insulating support frame 603 in a one-to-one correspondence with the number of wire cathodes, and the wire cathodes are joined via the metal springs. This involves the problem of requiring a complicated process of joining the terminals.

[0009]

In order to solve the above problems, the present invention provides a back electrode, an electron beam source, and a line cathode for inputting a modulation signal, an extraction electrode, and a focusing electrode inside a flat glass bulb vacuum. In a flat panel display device in which a horizontal deflection electrode, a vertical deflection electrode, and a screen plate are arranged and housed, an insulating layer is formed by spraying ceramic powder on the back electrode surface, and tension is applied to the upper surface of the insulating layer. The linear cathode is disposed so as to be in contact with each other while being accurately positioned, a metal powder is sprayed on the wire cathode to form a metal layer, and the metal layer and a terminal for inputting a signal are melted and joined.

[0010]

According to the present invention, the number of parts of the cathode portion can be reduced and the manufacturing method is simplified, so that the cost can be greatly reduced.

[0011]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a vertical sectional view of a fixed portion of a line cathode of an image display device according to an embodiment of the present invention. 1 is a back electrode, to which a ceramic member (here, alumina is used as an example) forms an insulating film 2,
Insulation between the line cathodes 3 or the back electrode 1 is ensured. The wire cathode 3 is located on the joint surface between the insulating film 2 and the metal layer 4, and is fixed accurately by the metal layer after being accurately positioned during manufacturing. Therefore, the fixed portion of the wire cathode is not displaced by disturbance, An insulating support frame that requires high precision is not used as a component.

FIG. 2 is a perspective view when the above-mentioned wire cathode fixing portion is applied to the cathode portion which is the electron beam source of the image display device in the embodiment of the present invention. Here, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Since the tension of the wire cathode 3 is preliminarily stretched, the wire cathode 3 is prevented from being bent due to thermal expansion even when the temperature of the wire cathode 3 rises. The structure does not require any parts to maintain the linearity of the cathode. The terminal 21 for inputting a signal to the line cathode 3 is directly melted and joined to the metal layer.

As described above, the image display device of the present invention is
Since the structure is simpler than that of a conventional image display device, it is possible to suppress an increase in cost due to an increase in screen size.

(Embodiment 2) Next, a method of manufacturing an image display device according to a third embodiment of the present invention will be described with reference to FIG. The backing electrode 33 is provided on the positioning board 31 provided with the positioning mechanism 32, and the positioning hole of the backing electrode is provided in the positioning mechanism 32.
A mask 34 having holes in the shape of an insulating film on the upper surface of the back electrode 33.
4 is inserted into the positioning mechanism 32 along the positioning hole.

Next, a metal powder (for example, a nichrome alloy) for facilitating adhesion of the molten ceramic powder to the surface of the back electrode 33 is sprayed to form a film of several to several tens of μm. After that, ceramic powder (for example, alumina) is sprayed to form a film having a thickness of several hundreds of μm. By the above process,
An insulating film is formed.

Next, the mask 34 is removed, and the jig 36, on which the wire cathode 35 having a proper tension is stretched, is accurately positioned and brought into contact with the insulating film formed on the upper surface of the back electrode 33. Place it while making it. From this state, the mask 37 having the holes of the shape pattern of the metal film is removed.
It inserts in the positioning mechanism 32 along the positioning hole which it has. After that, a metal powder (for example, a nichrome alloy) is sprayed to form a film having a thickness of several hundred μm. The oxide cathode material 38 applied to the wire cathode 35 when the metal powder is sprayed
Is removed, the conduction between the wire cathode and the metal layer is secured. The metal layer is formed by the above steps.

Next, the mask 37 is removed, the bonding surface of the bonding terminal 39 is placed in close contact with the metal layer, and the bonding surface is melted and bonded using a means such as a laser.

By performing the above steps, it is possible to manufacture the cathode part having a much simpler structure than the conventional structure by the simple steps.

[0019]

According to the present invention, it is possible to abolish the wire cathode support frame of an insulator, which requires high accuracy and is high in cost as a single item, and to greatly reduce the step of fixing and holding the wire cathode. We were able to reduce costs.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a wire cathode fixing portion of an image display device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a part of a cathode portion of an image display device according to an embodiment of the present invention.

FIG. 3 is a schematic view of the manufacturing process of the cathode portion of the image display device according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view of a conventional flat panel image display device.

FIG. 5 is an exploded perspective view of a cathode portion of a conventional flat panel image display device.

[Explanation of symbols]

 1 Back Electrode 2 Insulating Film 3 Wire Cathode 4 Metal Layer 21 Joining Terminal 31 Positioning Base 32 Positioning Mechanism 33 Back Electrode 34 Mask Having Insulating Film Pattern 35 Wire Cathode 36 Wire Cathode Overhanging Jig 37 Mask Having Metal Film Pattern 38 Oxide Cathode material 39 Bonding terminal 501 Back electrode 502 Wire cathode 503 to 508 Flat plate electrode 509 Front container 510 Back container 601 Wire cathode 602 Oxide cathode material 603 Insulating support frame 604 Metal spring 605 Signal input terminal

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiki Sasaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A back electrode, a wire cathode as an electron beam source, an electrode unit for extracting, focusing and deflecting an electron beam, and a screen plate are arranged and housed in a flat glass bulb vacuum in a vacuum state. In the flat-panel image display device, the end portion of the wire cathode is embedded in a metal film and fixed to the back electrode, which is a flat-panel image display device. 2. A back electrode, a wire cathode as an electron beam source, an electrode unit for extracting, focusing and deflecting an electron beam, and a screen plate are arranged and housed in a flat glass bulb vacuum in a vacuum state. In the flat panel image display device, an insulating film is formed on the back electrode so as to abut the end of the wire cathode, and a metal layer is formed in close contact with the insulating film and the wire cathode. A flat panel image display device, characterized in that terminals for inputting signals through layers are joined together. 3. A mask having an exposed hole is arranged on the back electrode so that the insulation powder is arranged at a predetermined position, and the molten insulation powder is sprayed from the mask to insulate the back electrode. The step of welding the layers, the step of removing the mask and positioning and abutting the end portion of the wire cathode, which has been stretched by applying tension, to the upper surface portion of the insulating layer, and the metal powder is placed at a predetermined position. Arranging a mask with exposed holes formed so that the metal powder is melted from above the mask and the wire cathode is embedded to form a metal layer, and a metal terminal is adhered to the metal layer. A method of manufacturing a flat panel image display device, which comprises the steps of arranging the metal layer and the metal terminal by melting and joining the metal layer and the metal terminal.