JPH05182584A - Manufacture of image display - Google Patents

Abstract

PURPOSE:To provide an image display for use in various kinds of display equipment, which can reproduce a picture of good quality without deteriorating the picture quality by solving the problem that the accuracy of positions of electrodes relative to each other cannot be secured. CONSTITUTION:To form an electrode block 29, electrodes are positioned relative to each other prior to baking of the electrode block and are each fixed by laser welding by utilizing the unnecessary portion 1b of a vertical deflection electrode and then the electrodes are baked. The unnecessary portion 1b of the vertical deflection electrode by which the electrodes are positioned relative to each other after baking of the electrode block is half etched and separated from the vertical deflection electrode 1a to form an image display.

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, but a cathode ray tube has a very large depth compared to a screen, and it is impossible to manufacture a thin television receiver. Met. 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 that of a cathode-ray tube on a flat panel device using an electron beam, the screen on the screen is divided into matrix-shaped sections without gaps, and the electron beam is divided into sections. 2. Description of the Related Art An image display apparatus has been proposed which 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.

First, FIG. 6 shows the structure of a conventional image display device. In FIG. 6, 6 is a back electrode, 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, and 13A and 13B. B is a vertical deflection electrode, 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. 5, 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. The conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is configured by applying a phosphor 27 that 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 supplied to facilitate electron emission, the surface of the line cathode 7 The electric field becomes positive and 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 order, 7b and 7c, for a certain period of time, and the line cathodes are horizontally moved. A sheet-shaped electron beam having a uniform current density distribution can be generated. The above-mentioned sheet-shaped electron beam is horizontally divided into a plurality of holes by the through hole 15 of the extraction electrode 8 and reaches the through hole 16 of the signal electrode 9 as a large number of electron beam rows 25. At this time, if the voltage V ₃ of the signal electrode 9 is V ₃ > V ₀ , the electron beam can pass, and if V ₃ <V ₀ , the electron beam loses kinetic energy and cannot pass. Therefore, by controlling V ₃ with time, the electron beam passage amount is adjusted individually for each electron beam according to the video signal for displaying the picture element. The electron beam that has passed through the signal electrode 9 then reaches the first focusing electrode 10 and the second focusing electrode 11, and the through hole 1
8. After being focused and shaped by the electrostatic lens effect of the slit hole 19, between the adjacent conductive plates of the horizontal deflection electrodes 12a and 12b and between the adjacent vertical deflection electrodes 13a and 13b of the conductive plate 2
Electrostatic deflection is performed horizontally and vertically by a potential difference (hereinafter, referred to as a deflection voltage) applied between 3 and 24. Furthermore, a high voltage (for example, 10
(KV) is applied, the electron beam is accelerated to high energy and collides with the metal back layer, causing 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. The 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 made to correspond to each subsection, and the electron beam is divided into two sections. By deflecting and scanning 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.

A method of manufacturing the electrode block of the image display device configured as described above will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows how the electrodes of the electrode block are fired. 1 is a vertical deflection electrode, 3 is an electrode firing jig, and 5 is an electrode firing jig.
Is a firing pin for electrode alignment. FIG. 4 is a cross-sectional view of the firing of the electrodes in FIG. When preparing an electrode block, each electrode is inserted while sandwiching a glass frit as an insulating material in the electrode alignment firing pin 5 attached to the electrode firing jig 3, and firing is performed for each electrode.

[0011]

However, in the above-mentioned conventional manufacturing method, since the alignment pin is inserted into the jig hole of the electrode and the plurality of electrodes are fired and joined in several times,
Due to the clearance between the jig hole of the electrode and the alignment pin, there is a problem in that the positional accuracy of the electrodes in the X and Y directions cannot be ensured.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an image display device which secures the accuracy of the positional relationship between the electrodes in the X and Y directions and reproduces a high quality image. To do.

[0013]

In order to achieve this object, the image display device of the present invention uses laser welding to an unnecessary portion unrelated to beam control after aligning the electrodes before firing the electrode block. It is manufactured by temporarily fixing it. .

[0014]

With this structure, since the electrodes are completely fixed and there is no rattling, the positional accuracy is ensured when the electrode block is fired, so that it is possible to reproduce a high quality image without causing deterioration of the image quality. it can.

[0015]

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

FIG. 1 shows how the electrodes of an image display device according to one embodiment of the present invention are fired. In FIG. 1, 1a is a vertical deflection electrode made of a conductive plate, and 1b is a vertical deflection electrode.
Is an unnecessary portion of the vertical deflection electrode, 2 is a half etching region, 3 is an electrode firing jig, and 4 is a laser welding portion. FIG. 2 is a cross-sectional view of the firing of the electrodes in FIG.

A method of manufacturing the electrode block of the image display device configured as described above will be described with reference to FIGS. Therefore, the electrodes are mechanically aligned with each other by image recognition before the electrode block is fired, and each electrode is fixed by the laser welding portion 4 of the vertical deflection electrode (unnecessary portion) 1b by a laser device. Then, the electrode firing jig 3 is placed on the electrode firing jig 3 together with a weight for weight loading to perform electrode firing. Then, the vertical deflection electrode (unnecessary portion) 1b in which the positions of the electrodes are aligned after firing the electrode block is separated from the vertical deflection electrode 1a by half etching 2 to complete the electrode block.

Although the electrodes are fixed by laser welding here, it goes without saying that the same effect can be obtained by spot welding or heat-resistant adhesive.

[0019]

As described above, according to the present invention, after the electrodes are aligned with each other before firing of the electrode block, the electrodes are temporarily fixed to the unnecessary portion unrelated to the beam control by laser welding. Since the space is completely fixed and there is no rattling,
It is an invention of a manufacturing method capable of realizing an image display device which has a configuration in which positional accuracy is ensured when an electrode block is fired, and which does not deteriorate image quality and reproduces good image quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing how electrodes are baked in an image display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing how the electrodes of an image display device according to an embodiment of the present invention are fired.

FIG. 3 is a perspective view showing a state of electrode firing of a conventional image display device.

FIG. 4 is a cross-sectional view showing a state of electrode firing of a conventional image display device.

FIG. 5 is a cross-sectional view showing the basic configuration of the image display device.

FIG. 6 is an exploded perspective view showing the basic configuration of the image display device.

[Explanation of symbols]

 1a Vertical deflection electrode 1b Unnecessary portion of vertical deflection electrode 2 Half etching region 3 Electrode firing jig 4 Laser weld

Claims (1)

[Claims] 1. A screen provided with a phosphor and a back electrode facing the screen, and a plurality of line cathodes, one in order from the back electrode side in a space sandwiched by the back electrode and the screen. A front glass that includes an electrode block composed of a single or a plurality of conductive plates, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, and further stores the screen, the line cathode and the electrode block in a vacuum state. A method of manufacturing an image display device including a container and a rear metal container, wherein each electrode is temporarily fixed by welding and joining with a laser device when an electrode block is formed.