JPH02121242A - Image displaying device - Google Patents

Abstract

PURPOSE:To eliminate reduction of brightness for a larger display size and make it possible to obtain a bright display by providing vertical slits in pulling electrode. CONSTITUTION:A pulling electrode 29 consists of a conductive plate 36 facing a back plate 27 through linear cathodes 28a-28c and having lines of throughholes 35 provided at proper intervals horizontally along horizontal lines facing the linear cathodes respectively. For a larger display size, therefore, the passage quantity of electron beam pulling electrode in the vertical direction can be increased without enlarging focus in the horizontal direction of electron beams 44. By throttling the vertical focus of the passage electron beams, phosphor 48 at a screen plate 47 can be radiated by electron beams of a higher density, thereby a display can be brighter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the shape of electrode holes in an image display device in video equipment.

BACKGROUND OF THE INVENTION Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a longer depth than the screen, making it impossible to manufacture thin television receivers. It was possible. Accordingly, a new display device has been proposed in Japanese Patent Application No. 288762/1983 to achieve a flat display device using electron beams.

This method divides the screen into multiple sections vertically, deflects the electron beam vertically in each section to display multiple lines, and then divides the screen horizontally into multiple sections to display each line. The phosphors such as RlG and B are made to emit light sequentially in each section, and the amount of electron beam irradiation to the phosphors such as R, G, and B is controlled by color video signals, and the television image as a whole is is displayed.

FIG. 2 shows the internal configuration of a conventional image display device.

In Fig. 2, l is a back electrode, 2a to 2c are line cathodes as electron beam sources, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 is a focusing electrode, 6 is a horizontal deflection electrode, and 7
0 is a vertical deflection electrode, and these components are housed in glass containers 8 and 9, and the inside of the container is evacuated.

The line cathodes 2A to 2C are horizontally stretched so as to generate an electron flow with a current density distribution that is approximately -like in the horizontal direction, and a plurality of line cathodes 2A to 2C are arranged vertically at appropriate intervals (in this embodiment, So 2
Only three (A, 20.2 C) are shown). These wire cathodes are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The back electrode l is
It is made of a flat conductive material and is provided in parallel to the wire cathodes 2A to 2C. The extraction electrode 3 is formed from a conductive plate 11 which faces the surface electrode l via the line cathodes 2a to 2c and has a row of through holes 10 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Become. The signal electrode 4 is composed of a row of vertically elongated conductive plates 12 arranged at predetermined intervals at positions horizontally opposite to each of the through holes 10 in the extraction electrode 3. has a similar through hole 13 at a position opposite to the through hole 10 of the extraction electrode 3. The focusing electrode 5 is the signal electrode 4
The conductive plate 15 has through holes 14 at positions opposite to the through holes 13 of the conductive plate 15. The horizontal deflection electrode 6 is the focusing electrode 5
A vertically elongated conductive plate 16, 160 is disposed on the same plane so as to face each other in the middle of a row of through holes 14 to form a pair of horizontal deflection electrodes, and the whole has a shelf shape. ing. The vertical deflection electrode 70 is composed of two comb-shaped conductive plates 18 and 180 that are interlocked with each other at an appropriate interval on the same plane. The plate 18a and the upper conductive plate 180 form a pair of vertical deflection electrodes. The screen 19 includes a phosphor 2 that emits light when irradiated with an electron beam.
0 is applied to the inner surface of the glass container 8, and a metal back layer (not shown) is added thereon.

Problems to be Solved by the Invention If an attempt is made to increase the screen size with such a structure, the electrodes can be extended laterally and the line cathodes can be extended in the horizontal direction. On the other hand, in the vertical direction, the deflection width of one line cathode may be increased to increase the number of deflection stages, or the number of line cathodes may be increased to extend the electrode into a dark blue color. However, when stretched vertically, the total number of deflection stages in the shrinking direction increases, so the time for the electron beam to emit light at one point is shortened (because the display time of one screen is fixed).As a result, the screen becomes dark. occurs.

In view of the above problems, the present invention provides an image display device that does not cause a decrease in brightness even when the screen size is increased, especially in the vertical direction.

Means for Solving the Problems In order to solve the above problems, the present invention provides a back electrode, a line cathode as an electron beam source, an extraction electrode, a signal electrode, and a focusing electrode from the back to the front of the screen.

The solid-state display device is characterized in that the extraction electrode has a vertically long electrode hole.

Function The present invention has an extraction electrode having the above structure, so that the electron beam can be focused without increasing the horizontal focus.
The amount of electron beams passing through the extraction electrode in the vertical direction can be increased. By narrowing down the vertical focus of the passing electron beam, the phosphor on the screen plate is hit by a more dense electron beam, increasing its brightness.
The screen becomes brighter.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the internal configuration of an image display device in an embodiment of the present invention. In the figure, 27 is a back electrode, 28A to 28C are line cathodes as electron beam sources, 29 is an electron beam extraction electrode, 30 is a signal electrode, 31 is a focusing electrode,
32 is a horizontal deflection electrode, and 33 is a vertical deflection electrode. These components are housed in a glass container 834, and the inside of the container is evacuated.

The wire cathodes 28A to 28C 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. In the figure, only three (28A, 280, and 28H are shown) are provided. These wire cathodes are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material. The back electrode 27 is made of a flat conductive material, and is connected to the wire cathodes 28a-2.
It is provided parallel to the 8th wheel. The extraction electrode 29 faces the back electrode 27 via the line cathodes 28a to 28c,
It consists of a conductive plate 36 having a row of through holes 35 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode.

The through hole 35 is a vertically long electrode hole in this embodiment. The signal electrode 30 is made up of a row of vertically elongated conductive plates 38 arranged at predetermined intervals at positions horizontally opposite to each of the through holes 35 in the extraction electrode 29.
In each conductive plate 38, the through hole 3 of the extraction electrode 29 is
A similar through hole 37 is provided at a position opposite to 5. The shape of the through hole 37 may be an ellipse, a rectangle, or a vertically elongated slit.

The focusing electrode 31 has through holes 39 at positions facing each through hole 37 of the signal electrode 30 . The shape of the through hole 39 may be a circle, an ellipse, or a slit, and the number of focusing electrodes may be plural. The horizontal deflection electrode 32 is made up of two reinforcing bars 40.41 that are interlocked with each other with an appropriate space in the horizontal direction with respect to the screen, and further extends from the two meshed reinforcing bars 40.41 in a direction perpendicular to the screen. The comb-shaped conductive plates 42 and 43 protruding from both sides are interlocked with each other with an appropriate space between them, and the protruding comb-shaped conductive plates 42 and 43 are located between the rows of through holes 39 of the focusing electrode 31. They are arranged so as to face each other, and are configured to form a pair of horizontal deflection electrodes. For this reason, two reinforcing bars 40 are required.
．． By applying a horizontal deflection voltage to each of the electron beams 41, the electron beam 44 emitted from the through hole 39 of the focusing electrode 31 is horizontally deflected between the comb-shaped conductive plates 42 and 43. The vertical deflection electrode 33 (330) is a conductive plate having a connecting portion 45 at the end, that is, two comb-shaped conductive plates 46 and 460 are interlocked with each other at an appropriate interval on the same plane. For example, for the electron beam 44, the lower conductive plate 46 and the upper conductive plate 460 form a pair of vertical deflection electrodes. A metal back layer (not shown) is added thereon.

According to this configuration, since the extraction electrode 29 has the vertically elongated electrode hole 35, even if the screen size is increased, the focus of the electron beam 44 in the horizontal direction is not increased, and the electron beam passes through the extraction electrode in the vertical direction. By increasing the amount of electron beams and by narrowing down the vertical focus of the electron beams that have passed through, the screen can be made brighter by hitting the phosphors 48 of the screen plate 47 with higher density electron beams.

Effects of the Invention As described above, according to the present invention, by making the electrode hole provided in the extraction electrode into a vertically elongated through hole, it is possible to extract the electron beam in the vertical direction without increasing the focus of the electron beam in the horizontal direction. By increasing the amount of electrons passing through the electrodes and narrowing down the vertical focus of the electron beam that has passed through, it is possible to hit the phosphor with a more dense electron beam, which reduces brightness even when the screen size is increased. There is no
This will give you a bright screen.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts showing the internal structure of an image display apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of essential parts showing the internal structure of a conventional image display apparatus. 27... Back electrode, 28i, 280, 28c.
... Line cathode, 29 ... Extracting electrode, 3
0... Signal electrode, 31... Focusing electrode,
32...Horizontal deflection electrode, 33i, 330...
...Vertical deflection electrode, 35... Electrode hole.

Claims (1)

[Claims] A back electrode, a line cathode as an electron beam source, an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, a vertical deflection electrode, and a screen plate are arranged from the back of the screen to the front, and these are placed inside a flat glass bulb under vacuum. 1. An image display device housed in a flat panel display device, wherein the extraction electrode has a vertically elongated electrode hole.