Mask-less single electron gun, color crt

Details Mask-less single electron gun, color crt Mask-less single electron gun, color crt

1976-12-17

1978-06-13

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 531, 313470, H01J 2980

Patent

active

040951448

ABSTRACT:
A color cathode ray tube (CRT) provides excitation of a plurality of noncontiguous picture elements disposed substantially in a matrix configuration of rows and columns on the inside surface of a video screen formation included within the tube, with a hollow electron beam provided by a modulatable, hollow beam electron gun assembly within the tube, each picture element including a plurality of different color phosphors deposited in a determined concentric geometric pattern, the screen formation further including a high work function dielectric material disposed interposingly with the picture elements of the matrix configuration for providing a negative electrostatic field gradient in a direction opposite to that of the incident hollow electron beam horizontally deflected across the screen by a deflection circuit, to cause registration of the beam with each successive picture element and to cause, in combination with the deflection circuit, the beam to step from the center of one picture element to the center of a next adjacent picture element is a horizontal row, the full hollow electron beam current being presented directly to the video screen without restriction through a post deflection apparatus, the electron gun providing the hollow beam with an instantaneous average diameter in dependence on the diameter of the instant, excited phosphor.

REFERENCES:
patent: 2619608 (1952-11-01), Rajchman
patent: 2962623 (1960-11-01), Beintema
patent: 4023063 (1977-05-01), King et al.

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