JPH01236559A - image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for installing a screen coated with a phosphor in a vacuum container, emitting light from the screen by collision with an electron beam, and deflecting, focusing, The present invention relates to an image display device that displays television images on a screen using signal modulation means.

Conventional technology 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. However, 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 of color display, and have not 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. Each time, the electron beam is deflected vertically to display multiple lines, and
It is divided horizontally into a plurality of sections, and each section is made to sequentially emit phosphors such as R, G, and B.
There is a device that displays a television image as a whole by controlling the amount of electron beam irradiation on the phosphor using a color video signal (see Japanese Patent Application Laid-Open No. 135590/1982). FIG. 2 shows its basic configuration.

In Fig. 2, from the back to the front, the back electrode 1, the line cathode 2 as an electron beam source, and the vertical focusing electrode 3m.
, 3b, a vertical deflection electrode 4, an electron beam flow control electrode 5, horizontal focusing electrodes 6a and 6b, a horizontal deflection electrode 7, an electron beam acceleration electrode 8 and a glass container 9.22 are arranged,
The components are placed in the glass container and evacuated.

The operation of the image display device configured as described above will be described below. First, 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 2-2
(Only four pieces are shown). In this embodiment, it is assumed that 15 pieces are provided, and 2I to 2Y are provided. These wire cathodes 2 are constructed by coating an oxide cathode material on the surface of a tungsten wire of 10 to 20 .mu.m'3, for example. Then, as described later, the upper line cathode 2
The electron beams are controlled to emit electron beams for a certain period of time in order from A to A. The back electrode 1 suppresses the generation of electron beams from other line cathodes 2 other than the line cathode 2 which is controlled to emit an electron beam for a period of time, which will be described later, and directs the generated electron beam only in the forward direction. It has the effect of pushing out toward the target. The back electrode 1 may be formed by a coating film of a conductive material adhered to the inner surface of the rear wall of the glass bulb.

Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. Vertical focusing electrode 3
A is a conductive plate 11 having horizontally long slits 10 facing each of the linear cathodes 2a to 2y;
The electron beam emitted from the is taken out through the slit 10 and focused in the vertical direction. 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 (nearly touching), essentially serving as slits. may be configured. Vertical focusing electrode 3b
is also similar. A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, and each of the vertical deflection electrodes 4 is composed of conductors 13a and 13b provided on the upper and lower surfaces of an insulating substrate 12, respectively. ing. Then, a vertical deflection voltage is applied between the opposing conductors 13m and 13b to deflect the electron beam in the vertical direction. In this configuration example, the pair of conductors 13m and 13b directs the electron beam from one line cathode 2 into one direction in the vertical direction.
Deflect to the position of 6 lines. Then, the 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and as a result, the screen 21
The electron beam is deflected so as to draw 240 horizontal lines upward.

Next, the electron beam flow control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of electron beam flow control electrodes 5 are arranged horizontally in parallel at predetermined intervals.

In this configuration example, 320 control electrode conductive plates 15 to 1
5n are provided (only 10 are shown in the figure)
. Each of the electron beam flow control electrodes 5 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, the electron beam flow control electrode 5
If 32,020 pixels are provided, 320 picture elements can be displayed per horizontal line. Also, in order to display images in color, each picture element is R and G.

The image is displayed using phosphors of three colors, and the R, G, and B video signals are sequentially applied to each electron beam flow control electrode 5. In addition, 320 sets of video signals for one line are simultaneously applied to the 320 electron beam flow control electrodes 5.
Video for each line is displayed at once. Horizontal focusing electrode 6a
is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits) facing the slits 14 of the electron beam flow control electrode 5, and the electron beam for each pixel divided in the horizontal direction is are focused horizontally into a fine electron beam. The horizontal deflection electrode 7 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 of the conductive plates 18 for each pixel. The electron beams are each deflected in the horizontal direction, and the R
,G.

Each phosphor of B is sequentially irradiated to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam. The electron beam accelerating electrode 8 is the vertical deflection electrode 4
It is made up of a plurality of conductive wires 19 provided horizontally at similar positions, and accelerates the electron beam so that it collides with the screen 21 with sufficient energy. The screen 21 is constructed by coating the back surface of a 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 20 is inserted into one slit 1 of the electron beam flow control electrode 5.
4, that is, one pair of three-color phosphors, R9G and B, are provided for each horizontally divided electron beam, and are coated in stripes in the vertical direction. . In FIG. 2, 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 two-dot chain lines indicate each of the plurality of electron beam flow control electrodes 5. Shows the horizontal divisions displayed corresponding to. In one section divided by these two,
As shown in an enlarged view in FIG. 3, there are R, G, and B phosphors 20 for one picture element in the horizontal direction, and a width for 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, 11N in the horizontal direction and 16N in the vertical direction.
It's a feather. Note that in FIG. 2, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity. In addition, in this embodiment, only one pair of JG and H phosphors corresponding to 20 pixel elements is provided for one electron beam flow control electrode 5, that is, for one electron beam; Of course, the electron beam flow control electrode 5 may be provided with R, G, and B video signals for two or more picture elements in sequence, and horizontal deflection is performed in synchronization with the R, G, and B video signals for two or more picture elements. Ru. The above is the general principle of the image display device.

This display device is compatible with the normal television broadcasting system, and is proposed to have an aspect ratio of around 3:4.

Problems to be Solved by the Invention However, since such a configuration uses a wire cathode, when an external shock or vibration is applied, the wire cathode vibrates.
The image projected on the screen begins to waver,
There is a problem that the image deteriorates considerably. Therefore, as a damper effect, it has been proposed that a non-conductive wire be strung in a direction perpendicular to the stretching direction of the wire cathode to prevent vibration of the wire cathode, but the electron beam is scattered by this wire. The problem is that the brightness of the corresponding part of the screen deteriorates, resulting in a picture that is extremely difficult to see.

The present invention aims to provide an image display device with excellent image quality while protecting a line cathode with a non-conductive wire.

Means for Solving the Problems Therefore, the present invention stretches a non-conductive wire primarily to prevent the vibration of the line cathode, and also makes the aspect ratio of the display device longer than 3=4. In addition, the display area on at least one of the left and right sides of the non-conductive wire position is set to 3=4 so that a television image can be displayed satisfactorily.

According to this configuration, the non-conductive wire effectively acts to prevent the vibration of the wire cathode, and the display area of the display device is divided into two to display the television image and images and characters completely independent of it. can be projected freely.

Example FIG. 1 shows an embodiment of the present invention.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 9.22 is a vacuum container, 2 is a wire cathode, and 23 is a non-conductive wire, which is stretched in a direction perpendicular to the stretching direction of the wire cathode 2. In addition, the back side of the line cathode 2 should be placed as close as possible without touching the line cathode 2.
It is arranged as follows.

21m and 21b indicate display areas of the screen 21. Note that figure a is a cross-sectional view, and figure a is a view seen from the display surface side. In this configuration, the aspect ratio of the entire device is not 3:4, but rather a slightly longer horizontal size, and one display area 21 m is used for television with an aspect ratio of 3:4, and the other display area 21
b is used as a sub area. This display area 21m, 2
1b is divided using a non-conductive wire 23 such as glass fiber.
has been achieved.

In this way, by using the non-conductive wire 23 as a damper to prevent the vibration of the line cathode 2, and dividing the display area into two parts 218 and 21b at that position, each television image and sub-image can be displayed separately. I was able to project it to my satisfaction.

Effects of the Invention As described above, according to the present invention, by using a non-conductive wire, it is possible to completely prevent the vibration of the wire cathode, eliminate the image quality deterioration caused by vibration, and to display a single vacuum container. The area can be divided into two parts, and independent images can be displayed simultaneously.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1a and 1b are a sectional view and a front view of an image display device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of an image display element that is the basis of the present invention, and FIG. FIG. 3 is an enlarged view of the screen of the image display element. 2... Line cathode, 9.22... Glass container (vacuum container), 21... Screen, 23...
...Non-conductive wire. Name of agent: Patent attorney Toshio Nakao and one other person

Claims (1)

[Claims] A screen coated with a phosphor that emits light when irradiated with an electron beam from the linear cathode, and electrodes for focusing, deflecting, and signal modulating the electron beam are provided, and the screen is arranged in a direction perpendicular to the direction in which the linear cathode is stretched. An image characterized in that a non-conductive wire is stretched as close as possible without contacting the line cathode, and the display area projected on the screen is divided into left and right by the non-conductive wire. Display device.