JPH0745217A - Image display device - Google Patents

Abstract

PURPOSE:To provide an image display device having stable and high image quality by eliminating deformation of a vertical deflecting electrode when it is adhered and joined to a horizontal deflecting electrode by glass at a high temperature in an electric furnace, enabling easy work, and forming a shape of the vertical deflecting electrode of not exerting adverse influence on an image in a plate type image display device. CONSTITUTION:A bridge 31 is arranged between conductive plates A29 and B30 of a vertical deflecting electrode 8, and opening holes 32 are arranged on both sides of the bridge 31. Throwing-away opening holes 33 in the same shape with the opening holes 32 are arranged at regular intervals in the conductor plates A29 and B30. In this constitution, deformation of the conductive plates A29 and B30 of the vertical deflecting electrode 8 is prevented, and cutting of the bridge 31 is facilitated, and influence of the opening holes is uniformized over the whole surface, so that an image display device having stable and high image quality is obtained.

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 in video equipment.

[0002]

2. Description of the Related Art Heretofore, a cathode ray tube has been mainly used as a color television image display element.
The CRT has a very long depth compared to the screen, and it was impossible to manufacture a flat-screen television receiver. Therefore, EL display elements, plasma display elements, liquid crystal display elements, and the like have been developed as flat panel display elements, but they are all insufficient in terms of performance such as brightness, contrast, and color reproducibility. Therefore, for the purpose of displaying a high-quality image similar to that of a cathode-ray tube on a flat panel device using an electron beam, the screen on the screen is divided into matrix-like sections without gaps, and the electron beam is divided into sections. 2. Description of the Related Art There is an image display apparatus that deflects and scans a phosphor to emit light to form a color television image as a whole. An example of the above-described conventional image display device will be described below with reference to the drawings.

FIG. 5 shows the structure of a conventional image display device. In FIG. 5, 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,
Reference numeral 8 is a vertical deflection electrode, in which these components are housed in glass containers 9 and 10 and the inside of the containers is evacuated. The line cathode 2 is horizontally stretched so as to generate an electron flow uniformly distributed in the horizontal direction.
Are provided in the vertical direction at appropriate intervals (only four are shown here). These wire cathodes 2 are
For example, the surface of a tungsten wire is coated with an oxide cathode material. The back electrode 1 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathode 2. The extraction electrode 3 is formed of a conductive plate that faces the back electrode 1 through the line cathode 2 and has rows of through holes 11 that are provided at appropriate intervals in the horizontal direction on a horizontal line that faces each line cathode. The through hole 11 is circular in the embodiment, but may be oval or rectangular,
It may also be slit-shaped. The signal electrode 4 is composed of a row of vertically elongated conductive plates 12 arranged at a position facing each of the through-holes 11 in the extraction electrode 3 with a predetermined interval therebetween, and in each conductive plate, the extraction electrode is formed. The same through hole 13 is provided at a position facing the through hole 11 of No. 3 of FIG.
have. The shape of the through hole 13 may be an ellipse or a rectangle, or may be an elongated slit shape in the vertical direction. The focusing electrode 5 is made of a conductive plate having through holes 14 at positions facing the through holes 13 of the signal electrode 4. The shape of the through hole 14 may be a circle, an ellipse, or a slit shape. The focusing electrode 6 has a slit hole 15 which is vertically connected at a position facing the through hole 14 of the focusing electrode 5.
The shape of the slit hole 15 may be a round hole, an ellipse, or a rectangular shape. The horizontal deflection electrode 7 is composed of conductive plates 16 and 17 connected to each other at two comb-like end portions which are meshed with each other on the same plane with an appropriate gap.
The space 18 formed between 17 faces the through slit hole 15 of the focusing electrode 6. The vertical deflection electrode 8 is shown in FIG.
As shown in FIG. 5, the conductive plates 19 and 20 connected at the ends thereof, that is, the secondary comb-shaped conductive plates 19 and 20 are in the same plane and are meshed with each other at appropriate intervals. The screen 21 is configured by applying a phosphor that emits light when irradiated with an electron beam to the inner surface of the glass container 9 and adding a metal back layer (not shown) on the inner surface. Further, the extraction electrode 3, the signal electrode 4, the focusing electrodes 5 and 6, the horizontal deflection electrode 7, and the vertical deflection electrode 8 described above are joined by an insulating adhesive (not shown here) to form an integrated unit. The 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.
Appropriate voltage is applied to the back electrode 1, the line cathode 2 and the extraction electrode 3 in a heated state to emit a sheet-like electron beam from the surface of the line cathode 2. The sheet-shaped electron beam is divided into a plurality of pieces by the through hole 11 of the extraction electrode 3 and becomes a large number of electron beam streams 23. The passing amount of the electron beam flow 23 is individually adjusted by the signal electrode 4 in accordance with the image signal applied to the signal electrode 4. Next, the electron beam that has passed through the signal electrode 4 passes through the through holes 14, 1 of the focusing electrodes 5, 6.
After being focused and shaped by the electrostatic lens effect of 5, the horizontal deflection electrode 7 is horizontally and vertically caused by the potential difference applied to the adjacent conduction plates 16 and 17 of the horizontal deflection electrode 7 and the conduction plates 19 and 20 of the vertical deflection electrode 8. Biased. Further, a high voltage (for example, 10 KV) is applied to the metal back layer of the screen 21, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor to emit light.

When the television screen is vertically and horizontally divided into a matrix to form a group of subsections 25, one electron beam separated as described above is made to correspond to each subsection, and an electron beam is generated. By deflecting and scanning only within each subsection, the entire screen can be displayed on the screen. Further, by controlling the RGB video signal corresponding to each pixel by the signal electrode 4, a television moving image can be reproduced.

[0006]

With the above-mentioned structure, there are the following problems in obtaining a high quality image in a large image display device.

As shown in FIG. 6, the vertical deflection electrode 8 is composed of two conductive plates 19 and 20. These conductive plates 19 and 20 are adhesively bonded to the horizontal deflection electrode 7 by an adhesive glass 26. Conductive plates 19 and 20 of the vertical deflection electrode 8
Bonding of the horizontal deflection electrode 7 and the horizontal deflection electrode 7 is performed at a high temperature in an electric furnace. At this time, the conductive plates 19 and 20 are very thin (0.2 mm in the conventional embodiment) and narrow (3.6 mm in the conventional embodiment), and the larger the image display device is, the longer the width (6 inch image) becomes. Display device is about 130m
m). Therefore, the conductive plates 19 and 20 and the horizontal deflection electrode 7
When glass is bonded at a high temperature in an electric furnace, a part of the conductive plates 19 and 20 is deformed as shown by 27 in FIG. When the conductive plates 19 and 20 of the vertical deflection electrode 8 are thus deformed, the above-mentioned electron beam vertically deflected due to the potential difference between the conductive plates 19 and 20 is not subjected to a predetermined deflection, and a part of the image is nonuniform. However, high quality images cannot be provided. In view of the above problems, the present invention stably provides high quality images.

[0008]

In order to solve the above problems, the present invention firstly provides a bridge on two adjacent conductive plates of a vertical deflection electrode, and a glass at a high temperature in an electric furnace. The conductive plate is prevented from being deformed at the time of adhering to the horizontal deflection electrode by the method, and electrically separated by cutting after adhering the horizontal deflection electrode to the glass. Secondly, opening holes are provided on both sides of the bridge to allow relief during cutting and facilitate cutting. Thirdly, the opening holes are provided at equal intervals, and the effect of the opening holes is made uniform at all positions where the electron beam passes.

[0009]

The operation of the present invention is achieved by firstly adopting a method in which a bridge is provided on two adjacent conductive plates of vertical deflection electrodes as described above, and after bonding with the horizontal deflection electrodes, the bridge is cut. , It is possible to prevent the conductive plate from being deformed during the glass bonding at a high temperature in the electric furnace, and secondly, by providing the opening holes on both sides of the bridge, it is possible to give a relief at the time of cutting to facilitate the cutting Thirdly, the opening holes are provided at equal intervals to make the effect of the opening holes uniform at all positions through which the electron beam passes, thereby making it possible to provide a stable image display device with high image quality. That is.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a vertical deflection electrode 8 of an image display device according to an embodiment of the present invention. Reference numerals 29 and 30 denote conductive plates (hereinafter, 29 is referred to as a conductive plate A and 30 is referred to as a conductive plate B for convenience), and 31 is a conductive plate A29 and a conductive plate B30.
A bridge, 32 is a cutout opening provided on both sides of the bridge 31, and 33 is a conductive plate A29 and a conductive plate B3.
0 are openings arranged at equal intervals (hereinafter referred to as discarding openings to distinguish them from the openings 32 on both sides of the bridge). In the present embodiment, the vertical deflection electrode 8 was manufactured by etching a 0.2 mm thin plate. As shown in FIG. 2, the vertical deflection electrode 8 configured as described above is adhesively bonded to the horizontal deflection electrode 7 by the glass 33 at a high temperature (not shown) in the electric furnace. After this, as shown in FIG. 3, all the bridges 31 are cut by a press machine (not shown) equipped with a blade having a cross section like 35. The vertical deflection electrode 8 completed as described above is shown in FIG. Reference numerals 29 and 30 denote conductive plates A and B after the bridge is cut. In the vertical deflection electrode 8 configured as described above, the bridge 31 exists firstly, so that when the vertical deflection electrode 8 and the horizontal deflection electrode 7 are adhesively bonded to each other by glass in a high temperature in an electric furnace, High accuracy can be maintained without the deformation of the conductive plate A29 and the conductive plate B30 as described above. Secondly, by providing the opening holes 32 on both sides of the bridge,
After the vertical deflection electrode 8 and the horizontal deflection electrode 7 are bonded and joined by glass, they become a processing relief portion when cutting the bridge 31 between the conductive plates A and B, which is very easy to process and is transformed into the conductive plates A and B. Is less likely to be given, and high accuracy can be maintained. Thirdly, by disposing a large number of discarding apertures 33 having the same shape as the apertures 32 in the conductive plates A and B at the positions 36 through which the electron beam passes as shown in FIG. The applied electrolysis of the conductive plates A and B are all uniform, and a uniform image can be provided.

[0012]

As described above, according to the present invention, it is possible to manufacture a highly accurate vertical deflection electrode, and it is possible to provide an image display device with stable and high image quality.

[Brief description of drawings]

FIG. 1 is a plan view of a vertical deflection electrode according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing adhesive bonding of a vertical deflection electrode and a horizontal deflection electrode with glass according to an embodiment of the present invention.

FIG. 3 is a plan view showing a cut state of a bridge of a vertical deflection electrode according to an embodiment of the present invention.

FIG. 4A is a plan view showing a completed state of the vertical deflection electrode in the embodiment of the invention. FIG. 4B is the same sectional view.

FIG. 5 is an external perspective view of a conventional pixel display device.

FIG. 6A is a plan view showing a modification of a conventional vertical deflection electrode and its conductive plate. FIG. 6B is a sectional view of the same.

[Explanation of symbols]

 8 Vertical Deflection Electrode 29 Conductive Plate A 30 Conductive Plate B 31 Bridge 32 Opening Hole 33 Discarding Opening Hole

Claims (3)

[Claims] 1. A front glass container having a phosphor coated on its inner surface, a back container facing the front glass container, and a space between the back container and the front glass container, from a single conductive plate. Back electrode, multiple line cathodes,
In an image display device provided with an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, which are composed of one or a plurality of conductive plates, a bridge is provided on the adjacent conductive plates of the vertical deflection electrodes. An image display device, characterized in that the bridge is cut before assembly. 2. The image display device according to claim 1, wherein opening holes are provided on both sides of the bridge of the vertical deflection electrode. 3. The image display device according to claim 2, wherein a large number of openings are provided in the vertical deflection electrode at equal intervals.