Electron gun of an image display apparatus

Details Electron gun of an image display apparatus Electron gun of an image display apparatus

1986-07-18

1988-09-06

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

313497, 315366, H01J 6302

Patent

active

047695757

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. TECHNICAL FIELD
The present invention relates to an electron gun of a flat type image display apparatus to be used in a field for an image information display apparatus, utilizing thermoelectron emission.
2. BACKGROUND ART
At present, cathode ray tubes are mainly used as display apparatus for color televisions. Conventional cathode ray tubes, however, have a disadvantage that they are very long in depth in comparison with screen size. Consequently, fabrication of a small depth television receiver has been impossible. Recently, an EL (electro luminescence) display apparatus, a plasma display apparatus, a liquid crystal display apparatus, and the like have been developed as a flat type image display apparatus. However their quality and performance in luminance, contrast and color reproducibility are not satisfactory and they are not practicable. If used at all, they have very limited purposes.
In order to display a color television image on a flat type image display apparatus using an electron beam, an image display apparatus for the television is developed, wherein a screen of the image display apparatus is divided in plural sections in the vertical direction, electron beams of the respective sections are deflected vertically to display plural lines, moreover, the screen is divided in plural sections in the horizontal direction, fluorescent substance for red (R), green (G) and blue (B) of the respective sections radiate in turn, and intensities of the electron beams emanated on the fluorescent substance of R, G, B are controlled by color video signals, there by to display a color television image as a whole.
The image display apparatus comprises, as will be described hereinafter, plural line cathodes, a group of electrodes of a vertical convergence electrode, vertical deflection electrodes, electron beam flow control electrodes, for converging, deflecting and accelerating the electron beams emitted from the above-mentioned line cathodes, a horizontal convergence electrode, horizontal deflection electrodes and an electron beam acceleration electrode between an anode and a rear electrode.
In the above-mentioned image display apparatus, the constitution of an electron gun, in a broad sense, consists of a rear electrode, the line cathode, the vertical convergence electrode, the vertical deflection electrode, the electron beam flow control electrode, the horizontal convergence electrode, the horizontal deflection electrode and the electron beam acceleration electrode. More narrowly, the rear electrode, the line cathode and the vertical convergence electrode among the above-mentioned group of electrodes is referred to as the electron gun. The electron gun in the present invention means the narrow configuration referred to above.
The conventional configuration of the electron gun is shown in FIG. 1. The rear electrode 1 has a function of ejecting forward the electron beam which is emitted from the line electrode 2 as an electron beam source, and is formed by a glass plate, a transparent conductive film 1a is formed on its surface opposing to the line electrode 2 by evaporation of, for example, oxidized tin and oxidized indium. The line cathode 2 is stretched horizontally, the plural line cathodes are provided in a vertical direction with a suitable interval (the four line cathodes are shown in FIG. 1). These line cathodes 2 are made of, for example, a tungsten line wherein its diameter is 15-30 micron and oxidized cathode substance of oxidized barium, oxidized strontium and oxidized calcium are coated on the surface thereof by, for example, electrodeposition. The vertical convergence electrode 3 is formed by a etched thin metal plate which is 0.1-0.2 mm in thickness and is made of 426 alloy (Ni: 42%, Cr: 6%, Fe: 52%), or the like, and a film of several micron of silver, platinum, gold or the like is formed on its surface by evaporation or wet plating. The vertical convergence electrode 3 extracts the electron beam emitted from the line cathode 2 forward and converge it.
However, in the above-mentio

REFERENCES:
patent: 4227177 (1985-04-01), Watanabe et al.

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