JPH02201852A - Image display device - Google Patents

Abstract

PURPOSE:To achieve a larger effective image plane by burying an anode electrode in a front glass container and taking out the anode terminal from a back metal. CONSTITUTION:An anode terminal 2 is buried in parallel with a surface of a container 14. The buried anode terminal 2 is taken out from the back metal side, so that the lateral outside dimension is made small and the effective image plane is made larger relatively. Further, the anode is herein taken out from the corner position, it may be taken out from the side surface of a side.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device for video equipment.

BACKGROUND OF THE INVENTION First, a conventional image display device will be described with reference to FIG. In FIG. 5, 6 is a back electrode, 5-72 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 IUI, and 12 is an electron beam source. and 120 are horizontal deflection electrodes, 13i and 1
30 is a vertical deflection electrode, and these components are housed in a glass container 14 and a back metal 1 made of 42-6 alloy, and the inside of the container 1.14 is evacuated.

The line cathode fins ~72 are stretched in the horizontal direction so as to generate an electron flow with a current density distribution that is approximately -like in the horizontal direction. ,
Only four wires (F, 70, 7C, and 72 are shown) are provided. These wire cathode fins 72 are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material.

The back electrode 6 is made of a flat conductive material, and is connected to the wire cathode fins 7 to 7.
The two are parallel to each other. The extraction electrode 8 is made of a conductive plate that faces the back electrode 6 via the line cathode fins 72 and has a row of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Although the through hole 15 is circular in this embodiment, it may be an ellipse or a rectangle, or, like the extraction electrode in the conventional embodiment described above (it may be slit-like), the signal electrode 9 is a through hole in the extraction electrode 8. It consists of a row of vertically elongated conductive plates 17 arranged at predetermined intervals at positions facing each other in the horizontal direction. in opposite positions,
A similar through hole 16 is present.

The shape of the through hole 16 may be an ellipse or a rectangle, and the shape of the first focusing electrode 10 may be a vertically elongated slit like the signal electrode of the conventional embodiment described above.
It is made of a 21It plate having through holes 18 at positions opposite to the through holes 16 of the signal electrodes 9.

The shape of the through hole 18 may be circular, oval, or slit-like. The second focusing electrode 11 has a vertically connected slit hole 19 at a position opposite to the through hole 18 of the first focusing 'tFilo. The shape of the slit hole 19 may be a round hole or an elliptical rectangle like the through hole 18 of the first focusing electrode IO. The horizontal deflection electrodes 12a and 120 are composed of two conductive plates 21 and 22 connected by comb-like end portions that are interlocked with each other with an appropriate space between them on the same plane. Space created between 120 20
is opposite to the through-slit hole 19 of the second focusing electric scraper 11 . The vertical deflection electrodes 13a and 130 are made of conductive plates connected at their ends as shown in 23.24, that is, two comb-shaped conductive plates are interlocked with each other on the same plane with an appropriate interval between them. For example, for the electron beam 25, the lower conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is constructed by coating the inner surface of the glass container 14 with a phosphor 27 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) thereon.

The operation of the image display device configured as described above will be explained.

First, a voltage V9 is applied to the back electrode 6, and a voltage (2) higher than (1) is applied to the extraction electrode 8. Furthermore, in order to heat the wire cathode and facilitate electron emission, V
, <Vo <v, when an appropriate voltage V0 is applied to the line cathode phi, the electric field on the line cathode surface becomes positive, and a current of electrons is emitted and accelerated toward the extraction electrode 8. Also, for example ■. 〉■If a voltage V0 of 2 is applied to the line cathode phi,
The electric field on the surface of the line cathode becomes negative and can suppress the emission of electrons. Therefore, by individually controlling the voltage of the line cathodes, 70.7 h, . . .
By repeating this sequence to emit an electron beam for a certain period of time, it is possible to generate a sheet-shaped electron beam having a uniform current density distribution in the horizontal direction for each line cathode. The above-mentioned sheet-shaped electron beam is then horizontally divided into a plurality of pieces by the through hole 15 of the extraction electrode 8.
Further, a large number of electron beams form a train and reach the through hole 1G of the signal electrode 9, but at this time, the voltage of the signal electrode 9 is decreased.

If we let V, > V, the electron beam passes through ■3.

If so, the electron beam loses kinetic energy and cannot pass through it. Therefore, by controlling (3) over time, the amount of electron beam passage is adjusted individually for each electron beam in accordance with the video signal for displaying the picture element.

The electron beam that has passed through the signal electrode 9 then passes through the first focusing electrode 10. After reaching the second focusing electrode 11 and being focused and shaped by the electrostatic lens effect of the through hole 18° and slit hole 19, it is focused between the adjacent conductive plates of the horizontal deflection type 112 and 120 and the vertical deflection electrode 13. , 130 adjacent conductive plates 2s
, 24 (referred to as the deflection voltage), it is electrostatically deflected horizontally and vertically. Furthermore, the metal back layer of the screen 26 is exposed to a high voltage (for example, 10KV).
) is applied, and the electron beam is accelerated to high energy and collides with the metal back, causing the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix of subsections 28, one electron beam separated as described above is associated with each subsection, and the electron beam is connected to each subsection. By deflecting and scanning only within minutes, the entire image can be displayed on the screen. Furthermore, by controlling the RGB video signals corresponding to each picture element over time using the signal electrode voltages as described above, it is possible to reproduce television moving images.

Problems that the invention aims to solve However, in the above configuration, FIG.

As shown in FIG. 4, the front glass container 14 has a hole 4 for the anode terminal 2a on the side surface, and the anode terminal 2a is taken out from there, so the external dimensions in the lateral direction are large and the effective screen is small. There was a problem with this. Here, 5 connects the anode terminal 2a to the front glass container 1.
This is a glass lift for fixing to 4.

In view of the above problems, the present invention provides an image display device that can enlarge the effective screen.

Means for Solving the Problems In order to solve the above problems, an image display device of the present invention has an anode terminal embedded in a front glass container, and the anode terminal is taken out from the back metal.

Function: With the above-described configuration, the present invention eliminates the need to take out the anode terminal from the side surface of the front glass container, so that the effective screen can be enlarged.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. 1st rJ! J. FIG. 2 shows a side view and a bottom view of the front, large container, and large container of an image display device according to an embodiment of the present invention.

In FIG. 1, 14 is a front glass container.

2 is an anode terminal that connects the metal back and flyback transformer. 3 is a back metal attachment part, which is integrated with the front glass container 14.

The operation of the image display device configured as described above will be explained below with reference to FIG.

First, FIG. 1 is a side view of the front glass container 14,
An anode terminal 2 is embedded parallel to the creeping surface of the container 14.

Since the embedded anode terminal 2 is taken out on the back metal side, the external dimension in the lateral direction becomes small and the effective screen becomes relatively large.

In the above embodiment, the anode terminal 2 is taken out at the corner, but it may be taken out from the side of the side.

Effects of the Invention As described above, according to the present invention, since the anode terminal is embedded in the front glass container and taken out from the back metal side, the effective screen can be enlarged.

[Brief explanation of the drawing]

FIG. 1 is a side view of a front glass container of an image display device according to an embodiment of the present invention, and FIG. 2 is a bottom view of the same part.
FIG. 3 is a side view of a front glass container of a conventional image display device, FIG. 4 is a bottom view of the same part, and FIG. 5 is an exploded perspective view showing the basic structure of the image display device.

Claims (1)

[Scope of Claims] A flat screen coated with phosphor and a back electrode made of a conductive plate facing the screen are provided, and a space between the back electrode and the screen is provided from the back electrode side. It is equipped with, in order, a line cathode, a beam extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, and also includes a front glass container and a back metal for housing these screens, line cathodes, and various electrodes in a vacuum state, Embed the anode terminal in the front glass container,
An image display device in which the anode terminal is taken out from the back metal.