Picture display device

Details Picture display device Picture display device

1990-01-08

1991-01-29

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, 313450, G09G 104, H01J 2958, H01J 2946

Patent

active

049889281

ABSTRACT:
Picture display device comprising a display tube with an electron gun having a tubular structure with an outer surface and an inner surface on which a helical resistance structure of a material having a high electrical resistance constituting a focusing lens is provided. The outer surface is provided with an electrode of readily electrically conducting material arranged opposite at least a part of the focusing lens for capacitively controlling the focusing lens by means of a dynamically variable voltage the amplitude of which is a function of the position of the electron beam spot on the display screen.

REFERENCES:
patent: 3375390 (1968-03-01), Schlesinger

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