JPH02160345A - Picture display device - Google Patents

Abstract

PURPOSE:To obtain a stable picture of high quality by preventing the oscillation of line cathodes with both ends of all line cathodes put in contact with an insulated rigid material. CONSTITUTION:Line cathodes 30 are restricted in height by a height restricting bar 32 and in addition positioned in a (Y) direction by a Y-direction positioning frame 33. Each of line cathodes 30a-30d is given tensile force by a line cathode spring 34 to provide for tension and put in slight contact with an insulated rigid material, a damper 31. The line cathodes 30a-30d with external force applied starts oscillation respectively at a proper frequency. At the same time when the oscillation starts, friction occurs in between each of the line cathodes 30a-30d and the insulated rigid material damper 31, and oscillation energy of respective line cathodes 30a-30d is converted into friction energy and dissipated as heat energy, so that the oscillation of the line cathodes 30 instantly deteriolates and stops. It is thus possible to obtain a stable picture of high quality.

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 color television image display elements, but cathode ray tubes are much longer in depth than screens, making it impossible to produce flat-screen television receivers. there were. Therefore, as display elements on a flat panel, EL display elements, plasma display elements,
Although liquid crystal display elements and the like have been developed, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. Therefore, with the aim of displaying high-quality images comparable to those on a cathode ray tube using a flat-panel device that uses electron beams, the screen is divided into matrix-like sections without gaps, and the electron beam is applied to each section. 2. Description of the Related Art There is an image display device that performs deflection scanning to cause phosphors 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. 1 shows the configuration of a conventional image display device.

In Figure 1, l 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. These components are placed in a glass container 9,
It is stored in lO and the inside of the container is evacuated. The line cathodes 2 are stretched in the horizontal direction so as to generate an electron current distributed in a horizontal direction, and a plurality of such line cathodes 2 are arranged vertically at appropriate intervals (here, 2 e 2 (Only four of the two are shown).

These wire cathodes 2 are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material.

The back electrode 1 is made of a flat conductive material, and the wire cathode 2E2
Two pairs are installed in parallel. The extraction electrode 3 is the wire cathode 2
In the embodiment, the six through holes 11 are made of a conductive plate that faces the back electrode l via the E22 and has a row of through holes 11 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. The signal electrode 4 is circular, but may be elliptical or rectangular (or may be slit-shaped).
A plurality of vertically elongated conductive plates 12 are arranged at predetermined intervals at positions facing each of the through holes 11 in the
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 made of a conductive plate having through holes 14 at positions facing each through hole 13 of the signal electrode 4 . Through hole 14
The shape may be circular, oval, or slit-like. The focusing electrode 6 has a vertically connected thrust hole 15 at a position opposite to the through hole 14 of the focusing electrode 5 . The shape of the slit hole 15 may be round, oval, or rectangular.

The horizontal deflection electrode 7 is composed of two conductive plates 16 and 17 connected by FFI tooth-shaped ends that are interlocked with each other at an appropriate interval on the same plane, and is made between the conductive plates 16 and 17. The space 18 faces the through-thrift hole 15 of the focusing electrode 6 . The vertical deflection electrode 8 consists of conductive plates 19, 20 or 2 connected at their ends as shown in FIG.
It consists of a number of comb-shaped conductive plates 19.2o interlocked with each other at appropriate intervals on the same plane. The screen 21 includes a phosphor 22 that emits light when irradiated with an electron beam.
is applied to the inner surface of the glass container 9, and a metal back layer (not shown) is added thereon. Further, the above-mentioned extraction electrode 3, signal electrode 4, focusing electrodes 5 and 6, horizontal deflection electrode 1i 7, and vertical deflection electrode 8 are each bonded with an insulating adhesive (not shown here), and are integrally formed. An electrode block 24 is formed.

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

First, the wire cathode 2 is heated by passing a heater current in order to facilitate electron emission. In the heated state, the back electrode l, 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 electrode 3, and becomes a large number of electron beam streams 23. This electron beam flow 2
3, the passing amount of each electron beam stream is individually set by the signal electrode 4 in accordance with the video signal applied to the signal electrode 4.

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 ■6 and I7 of the horizontal deflection electric scraper 7
The beam is deflected horizontally and vertically by the potential difference applied to adjacent conductive plates 19 and 20 of the vertical deflection electrode 8. Furthermore, the metal back layer of the screen 2I is applied with a high voltage (for example, l
0 KV) is applied, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix to form a collection of subdivisions 75, the electron beams separated as described above are made to correspond to each subdivision, and the electron beams are divided into each subdivision. By deflecting and scanning only within minutes, the entire image can be displayed on the screen. Moreover, by controlling the RGB video signals corresponding to each pixel using the signal electrodes 4, it is possible to reproduce a televised video.

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

As shown in FIG. 3, the green shade pii2 is a thin wire rod with a heel of several tens of micrometers in diameter, and both ends (only one side is shown) regulate the height Mll control-26, and the Y-direction positioning frame 27 controls the height. Performing direction positioning. Furthermore, the Y direction positioning frame body 2
A spring 28 attached to 7 provides tension on both sides or on one side.

When external vibrations are applied to the image display device equipped with the wire cathode 2 positioned and stretched in this manner, the wire cathode 2 starts to vibrate mainly in simple harmonic motion and ends attenuation, as shown in FIG. It continues to shake until When the wire cathode 2 vibrates, the through hole (11 in Figure 2) of the above-mentioned lead-out bridge (3 in Figure 2)
) The amount of the electron beam flow (23 in Figure 2) that passes through the screen changes periodically (not shown), and as a result, the brightness on the screen changes periodically, resulting in a stable, high-quality image. I couldn't do it.

In view of the above-mentioned problems, the present invention provides high-quality images stably at all times.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has the following features: abutting both ends of all wire cathodes against an insulating rigid body, and bringing both ends of the wire cathodes into contact with an insulating back rigid body; We have developed an image display device that can prevent the vibration of the line cathode.

Function The function of the present invention is that, as described above, by bringing the insulating rigid body into contact with the line cathode, even if vibration of the line cathode occurs from the outside to the image display device, the line cathode and the insulating rigid body are immediately brought into contact with each other. The friction absorbs the vibration energy of the line cathode and acts as a Danno f-, stopping the vibration of the line cathode and providing a stable, high-quality image.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a line cathode extending portion of an image display device according to an embodiment of the present invention. 30 i, 30 mouths, 3
0c and 302 are wire cathodes, and 31 is an insulating rigid damper. In the embodiment, a ceramic round rod with a smooth surface is used. 32 is a height regulating bar, and 33 is a Y-direction positioning frame. 34 is a wire cathode tension spring.

Although FIG. 1 only shows the structure of one end of the wire cathode 30, the other end also has the same shape.

The height of the wire cathode 30 is regulated by a height regulating bar 32, and the line cathode 30 is further positioned in the Y direction by a Y direction positioning frame 33. Each of the wire cathodes 30a, 30c, 30c, and 302 is stretched by being given tension by a wire cathode spring 34. Further, insulating rigid dampers 31 are brought into light contact with the wire cathodes 30a, 30c, 30c, and 302, respectively. In this embodiment, a ceramic round rod is used as the damper 31, but the material may be any insulating rigid body, and the shape is not limited to the round rod, but may be a plate-like object.

A case will be considered in which an external force such as vibration or shock is applied to an image display device having a line cathode extension section configured as described above. When external force is applied, the line cathode 30a, 30h, 30ha, 30
The two begin to vibrate at their respective natural frequencies. At the same time as the vibration starts, friction occurs between the wire cathodes 30i, 30c, 30c, 302 and the insulating rigid damper 31, causing each of the wire cathodes 30i, 30i,
The vibration energy of 30 mouths, 30 ha, and 30 two is converted into frictional energy and consumed as thermal energy. As a result, the vibration of the line cathode 30 is immediately damped and stopped.

Effects of the Invention As described above, according to the present invention, even when vibration of the wire cathode occurs due to an external force applied to the image display device, the insulated rigid damper immediately absorbs the vibration energy and acts as a damper to stop the vibration of the wire cathode. , can provide stable and high-quality images.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view of a line cathode strut part 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. FIG. 4, which is a partially exploded perspective view of a line cathode extending portion of an image display device, is a vibration mode diagram of a line cathode in a conventional image display device. 30 (30i to 302)... Line cathode, 31.
...Insulating rigid damper, 32...Height regulation bar, 33...Y direction positioning frame, 34
...Wire cathode tension spring. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, and a back electrode made of one conductive plate and a plurality of back electrodes in the space sandwiched between the back container and the first glass container. In an image display device equipped with a line 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, both ends of all the plurality of line cathodes are
An image display device characterized by being brought into contact with an insulating rigid body.