Current dependent type color cathode ray tube

Details Current dependent type color cathode ray tube Current dependent type color cathode ray tube

1983-10-17

1986-10-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2958

Patent

active

046161619

ABSTRACT:
An improved current dependent type color cathode ray tube which utilizes a color phosphor screen which has at least two phosphors that have current density versus brightness characteristics which differ from each other and which emit light of different colors and including an electron gun which emits an electron beam which impinges on the color phosphor screen and wherein the current density of the electron beam of the gun varies in response to color signals so as to cause the emission of the desired colors to produce a color image and wherein the focusing voltage of the electron gun is varied so that the just focussing state occurs at the highest drive current within the drive current range and the focal length associated with the focussing voltage at the just focussing state is displaced by more than 5% from the focal length represented by the lowest drive current.

REFERENCES:
patent: 3651359 (1972-03-01), Miyaoka
patent: 3949166 (1976-04-01), Fuse
patent: 4390896 (1983-06-01), Ploumen
patent: 4453179 (1984-06-01), Peters et al.
J. C. Greeson, Multicolor Variable Intensity Display, IBM Tech. Disclosure Bulletin vol. 12, No. 12, May 1970.

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