JPH05190082A - Manufacture of image display device - Google Patents

Abstract

PURPOSE:To provide the manufacture of a display device used for various imaging equipment that is to solve the pitch deviation of vertical deflection electrodes and to reproduce good quality pictures without causing deterioration. CONSTITUTION:When an electrode block 29 is made, a vertical deflection electrode is set up finally (at the uppermost portion), and a spacer 4 is inserted therein so that a vertical deflection electrode (positive electrode) 1 and a vertical deflection electrode (negative electrode) 2 can be formed at equal spaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing 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. However, a cathode ray tube has a very large depth as compared with a screen, and it is not possible to manufacture a thin television receiver. It was possible.
Therefore, EL display elements, plasma display elements, liquid crystal display elements, etc. 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 a CRT on a flat panel device using an electronic beam, the screen on the screen is divided into matrix-shaped sections without any gaps, and each section is divided into sections. This is an image display device which deflects and scans an electronic beam to cause a phosphor to emit light, thereby forming 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.

First, FIG. 5 shows a structure of a conventional image display device. In FIG. 5, 6 is a back electrode, and 7a to 7
D is a line cathode as an electron beam source, 8 is an electron beam extraction electrode, 9 is a signal electrode, 10 is a first focusing electrode, 11 is a second focusing electrode, 12A and 12B are horizontal deflection electrodes, Reference numerals 13a and 13b are vertical deflection electrodes, and these components are housed in the front glass container 14 and the rear metal container 1 to create a vacuum inside the container.

The line cathodes 7a to 7d are horizontally stretched so as to generate an electron flow having a substantially uniform current density distribution in the horizontal direction, and a plurality of (cathode) vertical lines are provided at appropriate intervals. In the embodiment, only four lines 7a to 7d are shown.) These line cathodes 7a to 7d are formed by coating an oxide cathode material on the surface of a tungsten wire, for example. The back electrode 6 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathodes 7a to 7d. The extraction electrode 8 faces the back electrode 6 via the line cathodes 7 a to 7 d, and is composed of a conductive plate having rows of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. The through hole 15 is circular in the embodiment, but may be oval or rectangular,
Further, the lead-out electrode of the above-mentioned conventional embodiment may have a slit shape. The signal electrode 9 is composed of a plurality of vertically elongated conductive plates 17 arranged at predetermined positions in a position facing each other in the through hole 15 in the extraction electrode 8 in the horizontal direction at a predetermined interval. A similar through hole 16 is provided at a position facing the through hole 15 of the extraction electrode 8. The shape of the through hole 16 may be an ellipse or a rectangle, or may be an elongated slit shape in the vertical direction like the signal electrode of the conventional example described above. The first focusing electrode 10 is made of a conductive plate having through holes 18 at positions facing the through holes 16 of the signal electrode 9. The shape of the through hole 18 may be circular, elliptical, or slit-shaped. The second focusing electrode 11 is the through hole 1 of the first focusing electrode 10.
8 has slit holes 19 vertically connected to each other. The shape of the slit hole 19 is the first focusing electrode 1
Similar to the 0 through hole 18, a round hole, an ellipse, or a rectangular hole may be used.

The horizontal deflection electrodes 12a and 12b are composed of two conductive plates 21 and 22 which are connected to each other at appropriate intervals on the same plane by comb-shaped end portions. Space 2 created between 12 a and 12 b
0 is opposed to the through slit hole 19 of the second focusing electrode 11. The vertical deflection electrodes 13 a and 13 b are 23 and 24.
As shown in FIG. 3, the conductive plates connected at the ends, that is, two comb-shaped conductive plates are intermeshed with each other at an appropriate interval on the same plane. For the electronic beam 25, for example, The lower conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is formed by applying a phosphor 27, which emits light when irradiated with an electron beam, to the inner surface of the glass container 14 and adding a metal back layer (not shown) thereon. Further, the extraction electrode 8, the signal electrode 9, the focusing electrodes 10 and 11, the horizontal deflection electrodes 12a and 12b, and the vertical deflection electrodes 13a and 13b described above are
Each of them is bonded with an insulating adhesive (not shown here) to form an integral electrode block 29. Also,
One in which the linear cathodes 7a to 7d are attached to the back electrode 6 at appropriate intervals using an attachment member (not shown) and the electrode block 29 is insulated and fixed, and an integrated electrode unit 30 is provided. Is formed. In addition, the electrode unit 30 includes a fixed base 31 fixed to the rear metal container 1.
In addition, for example, using screws 31 or the like, they are fixed at appropriate intervals so as to be parallel to the rear surface metal container 1.

The operation of the image display device configured as described above will be described. First, the voltage V is applied to the back electrode 6.
_{1. A} voltage V ₂ higher than V ₁ is applied to the extraction electrode 8. Further, by heating the line cathode and applying an appropriate voltage V ₀ satisfying V ₁ <V ₀ <V ₂ to the line cathode 7 a in a state where a heater current is passed in order to facilitate electron emission, the line cathode 7 a The electric field on the surface becomes positive and the electron flow is emitted and accelerated toward the extraction electrode 8. Further, for example, if a voltage V ₀ such that V ₀ > V ₂ is applied to the line cathode 7a, the electric field on the surface of the line cathode becomes negative and the emission of electrons can be suppressed. Therefore, by individually controlling the voltage of the line cathodes, the electron beam is repeatedly emitted from the upper line cathode 7a in the order of 7b and 7c for a certain period of time, so that each line cathode is horizontally leveled. A sheet-like electron beam having a uniform current density distribution in the direction can be generated.

The sheet-like electron beam described above is horizontally divided into a plurality of holes by the through hole 15 of the next extraction electrode 8 to form a larger number of electron beam rows 25 of the signal electrode 9. It reaches the through hole 16, but at this time, if the voltage V ₃ of the signal electrode 9 is set to V ₃ > V ₀ , the electron beam passes and V
_{If 3} <V ₀ , the electron beam loses kinetic energy and cannot pass through. Therefore, by controlling V ₃ with time, the electron beam passing amount is adjusted individually for each electron beam according to the video signal for displaying the picture element.

The electron beam having passed through the signal electrode 9 next reaches the first focusing electrode 10 and the second focusing electrode 11, and is focused by the electrostatic lens effect of the through hole 18 and the slit hole 19,
After being shaped, a potential difference (hereinafter referred to as a deflection voltage) applied between the adjacent conductive plates of the horizontal deflection electrodes 12a and 12b and between the adjacent conductive plates 23 and 24 of the vertical deflection electrodes 13a and 13b. ) Is electrostatically deflected horizontally and vertically. Furthermore, a high voltage (for example, 1
0 KV) is applied, and the electron beam has high energy.
Is accelerated to collide with the metal back layer and cause the phosphor 27 to emit light.

When a high voltage is applied to the metal back layer, a high voltage terminal (not shown here) is used. This high voltage terminal is attached to the front glass container 14 at a high temperature by an insulating adhesive. ing.

When the television screen is vertically and horizontally divided into a matrix to form a group of subsections 28, one electron beam separated as described above is associated with each subsection, and an electronic beam is assigned to each subsection. By deflecting and scanning the beam only within each subsection, the entire screen can be displayed on the screen. Further, by controlling the RGB video signals corresponding to the respective picture elements with the signal electrode voltage over time as described above, a television moving image can be reproduced.

[0011]

However, in the above-described conventional configuration, in the vertical deflection electrodes which are long in the lateral direction, the pitch of the vertical deflection electrodes is not equal due to the configuration, which causes the deterioration of image quality. Had.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing an image display device in which the vertical deflection electrodes are arranged at equal intervals and a high quality image is reproduced.

[0013]

In order to achieve this object, a method of manufacturing an image display device according to the present invention is designed so that the vertical deflection electrode surfaces are spaced apart during the firing of the electrodes so that the vertical deflection electrodes are evenly spaced. It is characterized by having a service.

[0014]

[Function] By inserting a spacer, the vertical deflection electrodes are fixed without displacement, and the vertical deflection electrodes are arranged at equal intervals, so that high quality image is reproduced without causing deterioration of image quality. can do.

[0015]

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

A method of manufacturing the electrode block of the image display device will be described with reference to FIG. First, when manufacturing the electrode block 29 composed of the respective electrodes shown in FIG. 5, the vertical deflection electrodes 1 and 2 are set at the last (uppermost), and at that time, the vertical deflection electrode (positive electrode) 1 and the vertical deflection electrode ( The electrode firing spacer 4 is placed in the beam passage hole 3 of the vertical deflection electrode so that the negative electrodes 2 are arranged at equal intervals.
The beam passage hole insertion portion 5 of the server 4 is made to match exactly. In this way, in order to further increase the weight, a weight (not shown) made of metal or ceramics having good flatness is placed and fired.

FIG. 2 shows an electrode firing spacer. In FIG. 2, 4 is an electrode firing spacer (main body), and 5 is a beam passage hole insertion portion. Although the material of the electrode firing spacer 4 is not limited, the same material as the electrode is preferable in order to match the coefficient of thermal expansion, but a ceramic material may be used. Further, although the shape of the beam passage hole insertion portion 5 of the electrode firing spacer 4 is made rectangular, it is needless to say that the same effect can be obtained even if the shape is pin-shaped.

FIG. 3 shows a vertical deflection electrode of an image display device according to an embodiment of the present invention. In FIG. 3, 1 is a vertical deflection electrode (positive electrode) made of a conductive plate, 2 is a vertical deflection electrode (negative electrode), and 3 is a beam passage hole.

[0019]

As described above, according to the present invention, spacers are inserted in the vertical deflection electrode surface so that the vertical deflection electrodes are evenly spaced at the time of firing, which is the time of manufacturing the electrode block. The electrodes are arranged at equal intervals, and it is possible to realize an image display device that reproduces good image quality without causing deterioration of image quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state of firing an electrode in one embodiment of the present invention.

FIG. 2 is a perspective view of an electrode firing spacer according to an embodiment of the present invention.

FIG. 3 is a vertical deflection electrode diagram of an image display device manufactured according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a basic configuration of an image display device.

FIG. 5 is an exploded perspective view showing the basic configuration of the image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical deflection electrode (positive electrode) 2 Vertical deflection electrode (negative electrode) 3 Beam passage hole 4 Electrode firing spacer 5 Beam passage hole insertion part

Claims (1)

[Claims] 1. A screen provided with a phosphor and a back electrode formed of a conductive plate facing the screen, the back electrode being provided in a space sandwiched between the back electrode and the screen. In order, a plurality of line cathodes, an extraction electrode composed of one or more conductive plates, a signal electrode,
Comprises a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode,
Further, in the image display device provided with the front glass container for housing the screen, the line cathode and various electrodes in a vacuum state and the rear metal container, a spacer is inserted between the vertical deflection electrodes when firing the electrodes. Image display device manufacturing method.