JPH0745220A - Plane type image display device - Google Patents

Abstract

PURPOSE:To prevent heating of a leader electrode by restraining an overcurrent, maintain assembling accuracy by restraining deformation, and secure insulating performance between electrodes by arranging slit holes in a part opposed to a ring getter of the leader electrode. CONSTITUTION:Slit holes 28 are arranged so as to cover a ring getter position 27 of a conductive plate 11. Thereby, heating of a leader electrode is prevented by restraining an overcurrent generated in the leader electrode due to a leakage magnetic flux of a high frequency coil in the vicinity of the ring getter position 27 of the conductive plate 11, and assembling accuracy is maintained by restraining deformation, and insulating performance between electrodes can be secured.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube has been mainly used as a display element for displaying a color television image, but since a conventional cathode ray tube has a wider depth than a screen, it is not possible to manufacture a thin television receiver. It was possible. Recently, EL display elements, plasma display devices, liquid crystal display elements, etc. have been developed as flat plate display elements.
All of them are 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 (red), G (green), and B (blue) phosphors are made to sequentially emit light for each section (hereinafter referred to as image subsections), and the R, G, and B phosphors The television image is displayed as a whole by controlling the irradiation amount of the electron beam by a color video signal.

A part of a conventional image display device is shown in an exploded perspective view in FIG. In FIG. 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 is a focusing electrode, 6 is a horizontal deflection electrode,
Reference numerals 7a and 7b are vertical deflection electrodes. These components are housed in a glass container 8 and a back container 9, and the interior of the container is evacuated to form an image display device.

The back electrode 1 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathode 2. The line cathodes 2 are horizontally stretched so as to generate an electron flow with a substantially uniform current density distribution in the horizontal direction, and a plurality of line cathodes 2 are vertically arranged at appropriate intervals (only four in this embodiment). Provided). These wire cathodes 2 are formed, for example, by coating an oxide cathode material on the surface of a tungsten wire.

The extraction electrode 3 is made of a conductive plate 11 and faces the back electrode 1 through the line cathode 2, and a row of through holes 10 provided at appropriate intervals in the horizontal direction is arranged on a horizontal line facing each line cathode. Electrons emitted from the linear cathode 2 are provided in a fixed direction by passing through the through holes 10.
The amount of electron beam is controlled by extracting a certain amount.

A plurality of signal electrodes 4 are vertically elongated conductive plates 12 which are arranged at predetermined positions in a position opposed to each of the through holes 10 in the extraction electrode 3 in the horizontal direction.
In each conductive plate 12, the extraction electrode 3
The same through hole 13 is provided at a position facing the through hole 10 of FIG. The signal electrode 4 controls the passage of the electron beam through the through hole 13 based on the video signal.

The focusing electrode 5 has a through hole 14 at a position facing the through hole 13 of the signal electrode 4 and a conductive plate 15 having a through hole 14.
And controls the size of the electron beam.

The horizontal deflection electrode 6 is a through hole 1 of the focusing electrode 5.
It is configured to arrange a pair of horizontal deflection electrodes by vertically arranging elongated conductive plates 16a and 16b on the same plane so as to face the middle of the row of 4 and form a pair of horizontal deflection electrodes. There is. The electron beam is deflected in the horizontal direction by the conductive plates 16a and 16b.

The vertical deflection electrodes 7a and 7b are composed of two comb-teeth-shaped conductive plates which are meshed with each other on the same plane with an appropriate gap therebetween. The conductive plate 18a and the lower conductive plate 18b form a pair of vertical deflection electrodes.
The electron beam is vertically deflected by a and b.

The screen 19 is constructed by applying a phosphor 20 that emits light by irradiation of an electron beam to the inner surface of a glass container 8 and adding a metal back layer (not shown) thereon.

The electrode unit 22 is formed by laminating a plurality of conductive plates from the extraction electrode 3 to the vertical deflection electrode 7.
In this electrode unit 22, the electron beam 17 is irradiated from the linear cathode 2, passes through the through holes 10, 13, and 14 provided in the extraction electrode 3, the signal electrode 4, and the focusing electrode 5, respectively, and the horizontal deflection electrode 6 and The screen 19 is irradiated via the vertical deflection electrode 7.

In this image display device, the seams of adjacent image subsections 21 on the screen 19 cannot be seen, and in order to obtain a highly uniform image, each electrode is processed and each electrode is assembled at the same time. It is manufactured by processing and positioning the electrodes with high accuracy.

A vertical cross section of a conventional image display device is shown in FIG. The same parts as those of the conventional example shown in FIG. In FIG. 3, 23 is an electrode support plate, 24 is a ring getter, and 25 is a high frequency coil.

The ring getter 24 is the electrode support plate 2
3 is attached to the back container 9 and is subjected to high frequency heating from the outside of the back container 9 by the high frequency coil 25 to perform getter flash.

An overall view of the extraction electrode of the conventional image display device is shown in FIG. The same parts as those of the conventional example shown in FIG. In FIG. 4, reference numeral 26 designates an electrode fixing hole for fixing the electrode unit 22 to the back container 9. Reference numeral 27 denotes a ring getter position, which indicates a relative position of the ring getter 24 with respect to the extraction electrode 3.

[0018]

However, in the conventional structure, since the extraction electrode 3 also faces the high frequency coil 25, the leakage magnetic flux of the high frequency coil 25 causes the extraction electrode 3 to face.
However, there is a problem that eddy current is generated and heat is generated, the extraction electrode 3 is deformed, assembly accuracy is deteriorated, and insulation failure with the signal electrode 4 is caused.

Therefore, an object of the present invention is to solve this problem,
By suppressing heat generation of the extraction electrode during getter flash, deformation is eliminated, assembly accuracy is maintained, and insulation performance between electrodes is ensured.

[0020]

An image display device of the present invention is provided with a line cathode as an electron beam source and a plurality of electrode plates between a back electrode and a screen, and these are laminated to form a flat glass container. After encapsulation, the interior is evacuated and an effective electron beam is extracted from the line cathode, and in a flat image display device that controls and displays an image on a screen, the extraction electrode of the electrode plate faces the ring getter. It has a structure in which a slit hole is provided in a portion to be formed.

[0021]

According to the flat image display device of the present invention, since the extraction electrode has the structure having the slit hole in the portion facing the ring getter, an eddy current is generated in the extraction electrode due to the leakage flux of the high frequency coil. Since the extraction electrode has the slit, the generation of the eddy current is suppressed, and as a result, the heat generation of the extraction electrode can be suppressed, deformation can be eliminated, and the assembly accuracy can be maintained and the interelectrode insulating performance can be secured.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example shown in FIG.

FIG. 1 is an overall view of the extraction electrode of the flat panel image display device according to the embodiment of the present invention. 3 is an extraction electrode, 11 is a conductive plate, 10 is a through hole, 26 is an electrode fixing hole, 27 is a ring getter position, 28 is a slit hole, and a slit hole 28 is formed so as to cover the ring getter position 27 of the conductive plate 11. It is provided.

According to this structure, the slit hole 2 shown in FIG.
8 is provided, it is possible to suppress heat generation due to the leakage magnetic flux at the time of getter flash by the high frequency coil near the ring getter position 27 of the conductive plate 11.

[0025]

According to the present invention, since the extraction electrode has a slit hole in the portion facing the ring getter, an eddy current is generated in the extraction electrode due to the leakage magnetic flux of the high frequency coil. Since the slits are provided, the generation of eddy current is suppressed, and as a result, the heat generation of the extraction electrode can be suppressed, deformation can be eliminated, and assembly accuracy can be maintained and insulation performance between electrodes can be ensured.

[Brief description of drawings]

FIG. 1 is an overall view of an extraction electrode according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of a conventional flat image display device.

FIG. 3 is a vertical sectional view of a conventional flat image display device.

FIG. 4 is an overall view of an extraction electrode of a conventional image display device.

[Explanation of symbols]

 3 Extraction Electrode 10 Through Hole 11 Conductive Plate 26 Electrode Fixing Hole 27 Gettering Position 28 Slit Hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tatsuaki Watanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A line cathode as an electron beam source and a plurality of electrode plates are provided between a back electrode and a screen, these are laminated and sealed in a flat glass container, and then the inside is evacuated to obtain the line cathode. In a flat image display device for extracting an effective electron beam from the above and controlling it to display an image on a screen, a slit hole is provided in a portion of the extraction electrode of the electrode plate facing the ring getter. Flat image display device.