JPS6023940A - Manufacture of electrodes of picture display device - Google Patents

Abstract

PURPOSE:To obtain a highly reliable picture display device which ensures stable quality of displayed picture by providing the structure where the acceleration electrode is formed by a thin plate and given rigidity. CONSTITUTION:A rear electrode 31, a cathode 32 as electron beam source, vertical focusing electrodes 33, 33, a vertical deflection electrode 37, an electron beam acceleration electrode 38 and a screen plate 39 are arranged and these components are housed in the vacuumed glass casing. The acceleration electrode has a structure of thin plate. Therefore if a Coulomb force is generated when a voltage is applied across electrodes, rigidity is improved by a thin plate, the acceleration electrode deflects only in a small amount, minimizing the effect on displayed pictures.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing electrodes of an image display device in video equipment.

Conventional configurations and their problems Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to use for thin TVs. It was impossible to build a John receiver.

In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. However, it has not yet been put into practical use. Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. The electron beam is deflected vertically for each line to display multiple lines, and then divided horizontally into multiple sections to display R, G, and G signals for each section.
, B, etc. are made to emit light sequentially, and the R, G
.

A conventional image display element displays a television image as a whole by controlling the amount of electron beam irradiation on a phosphor such as B using a color video signal.
As shown in the figure, in order from the rear to the front, a back electrode 1, a line cathode 2 as an electron beam source,
Vertical focusing electrodes 3, 3', vertical deflection electrodes 4, electron beam flow control electrodes 6, horizontal focusing electrodes 6, horizontal deflection electrodes 7, electron beam accelerating electrodes 8, and glass containers 9, 22 are arranged and configured, As described above, the components are housed in the glass container and evacuated. A line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. Here, only four (2A to 22 are shown) are provided. In this embodiment, it is assumed that 16 pieces are provided, and 2I to 2Y are provided. These wire cathodes 2 are constructed by applying an oxide cathode material to the surface of a tungsten wire having a diameter of 10 to 20 μm, for example. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time.

The back electrode 1 creates a potential gradient with a vertical focusing electrode 3, which will be described later, and is controlled to emit electron beams for four fixed periods of time. This function suppresses the generation of electron beams and pushes out the generated electron beams only in the forward direction. This back electrode 1 may be formed by a coating of electrically conductive material applied to the inner surface of the rear wall of the glass bulb. Further, instead of the back electrode 1 and the line cathode 2, a planar electron beam emitting line may be used. The vertical focusing electrode 3 is a conductive plate 1 having a horizontally long slit 10 facing each of the line cathodes 2a to 2y.
1, the electron beam emitted from the line cathode 2 is taken out through the slit 10 and focused in the vertical direction.

The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes arranged horizontally at small intervals (so that they almost touch each other). It may also be configured as a slit. The vertical focusing electrode 3' is also similar. The vertical deflection electrode 4 is
A plurality of slits 10 are arranged horizontally at intermediate positions, and conductors 13 and 13' are provided on the upper and lower surfaces of an insulating substrate 12, respectively. And the opposing conductors 13°13
A vertical deflection voltage is applied between '' to deflect the electron beam in the vertical direction.

In this configuration example, the electron beam from one m-cathode 2 is deflected to a position corresponding to 16 lines in the vertical direction by a pair of conductors 13 and 13'. Then, 15 vertical deflection electrodes 4 corresponding to each of the 16 line cathodes 2 are arranged.
A pair of conductors is formed, and eventually two conductor pairs are formed on the screen 21.
The electron beam is deflected to draw 40 horizontal lines. Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 5 are arranged in parallel in the horizontal direction at predetermined intervals. In this configuration example, 320 control electrode conductive plates 15a to 16n are provided (only 10 are shown in the figure). Each of the control electrodes 6 separates and extracts the electron beam into one picture element in the horizontal direction, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element.

Therefore, if 32,020 control electrodes 5 are provided, 320 pixels can be displayed per horizontal line.

In addition, in order to display images in color, each picture element is R, G.
, H, and each control electrode 5
The R, 'G, and B video signals are sequentially added to the . - Also, the 320 control electrodes 5 have three lines for one line.
A 20m video signal is applied at the same time, and one line of video is displayed at one time. The horizontal focusing electrode 6 has a plurality of vertically long electrodes (320
It is composed of a conductive plate 17 having a slit 16, and focuses the electron beams of each picture element divided horizontally into fine electron beams. The horizontal deflection electrode γ is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each conductive plate 18 for each picture element. The electron beams are respectively deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 21 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam.

The acceleration electrode 8 is composed of a plurality of conductive wires 19 provided horizontally at the same position as the vertical deflection electrode 4.
The electron beam is accelerated to collide with the screen 21 with sufficient energy. The screen 21 is constructed by coating the back surface of the glass container 9 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor 2o is one of the control electrodes 6.
R, G for two slits 14, that is, for each horizontally divided electron beam.

One pair of three color B phosphors are provided, and they are applied in stripes in the vertical direction.

In FIG. 1, the broken lines drawn on the screen 21 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in the enlarged view in Fig. 2, one section partitioned by these two has two RoG and H phosphors for one pixel in the horizontal direction.
0, and has a width of 16 lines in the vertical direction.

Note that in the figure, A is one section in the vertical direction, and B is one section in the horizontal direction. The size of one section is, for example, 11 runs in the horizontal direction and 16 runs in the vertical direction. It should be noted that in Figure 1, the horizontal length is enlarged to the vertical direction to make it easier to understand (8).

In addition, in this embodiment, only one pair of R, G, and B phosphors 20 for one picture element is provided for one control electrode 5, that is, one electron beam, but for two or more picture elements, Of course, the control electrode 5 may be provided with RoG for two or more picture elements.

The B video signals are sequentially separated and horizontally deflected in synchronization with them. However, in the above configuration, when a voltage is applied to each electrode, the accelerating electrode 8 is pulled toward the horizontal deflection electrode 7 by the Coulomb force, causing the accelerating electrode 8 to twirl and appear as horizontal lines in the image. However, it had major drawbacks as an image display device.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention aims to improve the sway of the accelerating electrode.

Structure of the Invention The present invention has an accelerating electrode in the form of a thin plate, and has a structure that gives the accelerating electrode rigidity even when a voltage is applied to each electrode, so that the accelerating electrode can minimize the amount of tower b due to Coulomb force. This has the unique effect of producing a very beautiful screen with no horizontal lines.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows the configuration of an accelerating electrode in one embodiment of the present invention.

In FIG. 3, from the back to the front, the back electrode 31, the line cathode 32 as an electron beam source, the vertical focusing 1
The cylinders 33, 33', a vertical deflection electrode 37, an electron beam accelerating electrode 38, and a screen plate 39 are constructed as auxiliary devices, and these components are housed in a glass container (not shown) with the interior evacuated.

As in the present invention, since the accelerating electrode has a thin plate-like structure, even if a voltage is applied between each electrode and Coulomb force is generated,
Since the accelerating electrode has a thin plate shape and has improved rigidity, the amount of deflection of the accelerating electrode is minimal. FIG. 4 is a graph showing the maximum amount of deflection when a voltage is applied to a linear accelerating electrode and a thin plate accelerating electrode. For example, when the voltage applied to the accelerating electrode is set to 18 to 2, the amount of deflection for a thin plate-like object will be about 20% compared to a linear object. It has become possible to significantly reduce the effect on images.

Effects of the Invention As described above, if the accelerating electrode of the present invention is structured to have a thin plate shape, even if a voltage is applied to each electrode and a Coulomb force is generated, the amount of deflection is small, so there is no adverse effect on the image. This has made it possible to supply large quantities of inexpensive image display devices with stable image quality and high reliability.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of an image display element used in a conventional image display device, Figure 2 is an enlarged plan view of the screen, and Figure 3 is an exploded perspective view of an image display element used in a conventional image display device.
The figure is an exploded perspective view of an image display element according to an embodiment of the present invention, and FIG. 4 is a graph showing the applied voltage and the maximum amount of deflection depending on the structure of the accelerating electrode. 2, 32... Cathode, 21.39... Fluorescent material 3.8.38... Accelerating electrode, 9.22...
...Glass container.

Claims (1)

[Claims] A cathode, in which a plurality of electrodes are provided between the cathode and the phosphor. The phosphor and electrodes are fired and fixed, and sealed in a glass container 11
17. A method of manufacturing an electrode for an image display device, in which an electron beam accelerating electrode is formed into a thin plate structure among the electrodes of the image display device, and deflection due to Coulomb force generated when a voltage is applied to each electrode is prevented.