JPH0349138A - Image display device - Google Patents

Abstract

PURPOSE:To prevent the deformation of a back electrode and obtain a stable image with high quality by fitting and fixing linear cathodes to external connecting terminals fitted to a back container directly or via linear cathode suspending springs. CONSTITUTION:Linear cathodes 2a-2d are regulated in height by a height regulating bar 26 and positioned by a Y-direction positioning frame 27. Individual linear cathodes 2a-1d are applied with tension by linear cathode springs 28 and suspended. Springs 28 are not fixed to the frame 27 and directly fitted and fixed to external terminals 29. The tension of linear cathodes 2a-2d is not transmitted to a back electrode 1, thus the electrode 1 is not deformed, the space distance between linear electrodes 2a-2d and the beck electrode 1 and tension of linear electrodes 2a-2d are kept constant, and a stable image with high quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device for video equipment.

Conventional technology Conventionally, cathode ray tubes have been mainly used as image display elements for color televisions, but cathode ray tubes have a much longer depth than the screen, making it impossible to manufacture flat-screen television receivers. there were. Therefore, EL display elements, plasma display elements, liquid crystal display elements, and the like have been developed as display elements on a flat panel, but all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. Therefore, in order to display high-quality images of Brown Sugakasami on a flat panel device that uses electron beams, the screen is divided into matrix-like sections without any gaps, and each section is divided into sections using electron beams. We have proposed an image display device that deflects and scans the phosphor to cause the phosphor to emit light, thereby forming a color television image as a whole. An example of the conventional image display device mentioned above will be described below with reference to the drawings.

FIG. 2 shows the configuration of a conventional image display device'. In Figure 2, 1 is a back electrode, 2 is a line cathode as an electron beam source, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 and 6 are focusing electrodes, 7 is a horizontal deflection electrode, and 8 is a vertical deflection electrode. Yes, these components are placed in a glass container9.1
0 and the inside of the container is evacuated. The line cathodes 2 are stretched in the horizontal direction so as to generate an electron flow that is uniformly distributed in the horizontal direction. (Only four of the two are shown). These wire cathodes are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The back electrode l is made of a flat conductive material and is provided in parallel to the line cathodes 2i to 22. The extraction electrode 3 is made of a conductive plate that faces the back electrode l via the line cathodes 2a to 22, and has a row of through holes II provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Although the through holes 11 are circular in the embodiment, they may be oval or rectangular, or may be slit-shaped. It consists of a plurality of vertically elongated conductive plates 12 arranged in a row, and each conductive plate has a similar through hole 13 at a position opposite to the through hole 11 of the extraction electrode 3. The shape of the through hole 13 may be an ellipse or a rectangle, or may be a vertically elongated slit. The focusing electrode 5 is connected to the through hole 1 of the signal electrode 4.
The shape of the through-hole 14 made of a conductive plate having through-holes 14 at positions opposite to the through-holes 14 and 3 may be circular, elliptical, or slit-like.
It has a vertically connected slit hole 15 at a position opposite to 4. The shape of the slit hole 15 may be a round hole, an ellipse, or a rectangle.The horizontal deflection electrode 7 is a conductive plate connected by two comb-shaped ends that are interlocked with each other on the same plane with an appropriate interval. 16 and 17, and a space 18 created between the conductive plates 16 and 17 is connected to the focusing electrode 6.
It is opposed to the through slit hole 15 of. The vertical deflection electrode 8 has a conductive plate 19 connected at its end as shown in FIG.
．． 20, that is, two comb-shaped conductive plates 19 and 20 are arranged on the same plane and are interlocked with each other at an appropriate interval. The screen 21 is constructed by coating the inner surface of the glass container 9 with a phosphor 22 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) thereon. In addition, the above-mentioned extraction electrode 3. Signal bridge 4. Focusing electrodes 5 and 6. The horizontal deflection electrode 7 and the vertical deflection electrode 8 are each bonded with an insulating adhesive (not shown here) to form an integrated electrode block 24.

The operation of the image display device configured as described above will be briefly described.

First, a heater current is applied to the wire cathode 2 to heat it to facilitate electron emission. In the heated state, the back electrode 1, the wire cathode 2.
A suitable voltage is applied to the extraction electrode 3 to emit a sheet-like electron beam from the surface of the linear cathode 2. The sheet-like electron beam is divided into a plurality of parts by the through hole 11 of the extraction current w7A3, and becomes a large number of electron beam streams 23. This electron beam flow 23 is generated in accordance with the video signal applied to the signal electrode 4.
The signal electrode 4 adjusts the amount of passage of each electron beam individually.

Next, the electron beam that has passed through the signal electrode 4 is directed to the focusing electrode 5.
Focusing by the electrostatic lens effect of the through holes 14 and 15 of 6,
After being formed, the adjacent conductive plates 16.1 of the horizontal deflection electrode 7
It is deflected horizontally and vertically by the potential difference applied to adjacent conductive plates 19 and 20 of 7 and 8. Further, a high voltage (for example, V to IO) is applied to the metal back layer of the screen 2I, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor 22 to emit light.

When the TV screen is divided vertically and horizontally into a matrix of 25 subdivisions, one electron beam separated as described above is associated with each subdivision, and the electron beam is divided into each subdivision. Deflection only within minutes.

By scanning, the entire image can be displayed on the screen. Furthermore, by controlling RGB video signals corresponding to each pixel using the signal electrodes 4, television moving images can be reproduced.

Problems to be Solved by the Invention In order to constantly obtain high-quality images in the above-described configuration, the following problems have been encountered.

As shown in FIG. 3, the wire cathode 2 is a thin wire made of μ-steel with a small diameter, and its height is regulated by height regulating bars 26 fixed to the back electrode 1 at both ends (only one side is shown). , the Y-direction positioning frame 27 fixed to the back electrode 1 performs positioning in the Y-direction, and a spring 28 attached to the Y-direction positioning frame 27 applies tension to both ends or one side.
Furthermore, it is attached and fixed to the external connection terminal 29.

In such a state, a linear cathode tension is always applied to the back electrode 1 in the same direction as the linear cathode tension, and the back electrode 1 is deformed. When the back electrode 1 is deformed, the spatial distance between the back electrode 1 and the wire cathode 2 and the tension of the wire cathode 2 become uneven, and the through hole (second
The amount of the electron beam flow (23 in FIG. 2) passing through 11) in the figure became non-uniform, making it impossible to obtain stable, high-quality images.

In view of the above problems, the present invention provides an image display device that can always stably obtain high-quality images.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method for attaching a wire cathode directly to an external connection terminal attached to a rear container or via a wire cathode tension spring fixed to an external connection terminal. By fixing the wire cathode tension on the back electrode, the birch material is used.

Function The function of the present invention is to attach and fix the wire cathode directly to the external connection terminal attached to the rear container or via the wire cathode tension spring fixed to the external connection terminal as described above. This prevents tension from being transmitted to the back electrode, thereby preventing deformation of the back electrode, and providing stable, high-quality images.

This will be explained with reference to the drawings.

FIG. 1 shows the structure of a line cathode extending portion of an image display device in an embodiment of the present invention. 1 is the back electrode, 2
A, 20.2 C, 22 is a wire cathode, 10 is a rear container, 26
27 is a height regulating bar, 27 is a Y-direction positioning frame body, 28 is a wire cathode suspension spring, and 29 is an external connection terminal implanted in the rear container IQ. Although FIG. 1 only shows the structure of one end of the wire cathode 2, the other end also has the same shape. The height of the wire cathode 2 is regulated by a height regulating bar 26, and is further positioned in the Y direction by a Y direction positioning frame 27. Each of the wire cathodes 2a, 20, 2c, and 22 is stretched by being given tension by a wire cathode spring 28. The wire cathode spring 28 is not fixed to the Y-direction positioning frame 27, but is directly attached and fixed to the external connection terminal 29. In the illustrated embodiment, the wire cathode spring 28 and the external connection terminal 29 are separate parts, but they may be an integral part.

In the image display device having the line cathode tension section configured as described above, the line cathode tension is not transmitted to the back electrode 1, so the back electrode 1 is not deformed. 2-2 may be connected directly to the external connection terminal 29 without using a spring.

Effects of the Invention As described above, according to the present invention, the wire cathode suspension tension is not transmitted to the back electrode, so the back electrode is not deformed, and the spatial distance between the wire cathode and the back electrode, as well as the wire cathode The tension is maintained uniformly, making it possible to stably obtain high-quality images.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view of a line cathode stretching section of an image display device according to an embodiment of the present invention, FIG. 2 is a partially exploded perspective view showing the configuration of a conventional image display device, and FIG. 3 is a conventional FIG. 3 is a partially exploded perspective view of a line cathode extending portion of the image display device of FIG. 1... Back electrode, 2-2... Line cathode, 10... Back container, 26... Height regulation bar, 27... ...Y direction positioning frame, 28
...Wire cathode suspension spring, 29...External connection terminal.

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, a back electrode made of one conductive plate in the space sandwiched between the back container and the front glass container, and a plurality of wires. In an image display device equipped with a cathode, an extraction electrode made of one or more conductive plates, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode,
An image display device characterized in that the wire cathode is attached and fixed to an external connection terminal attached to the rear container directly or via a wire cathode tension spring fixed to the external connection terminal.