Electron beam position control for color display

Details Electron beam position control for color display Electron beam position control for color display

1984-08-20

1987-01-06

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, H04N 924

Patent

active

046351078

ABSTRACT:
An electron beam position control arrangement for a color display cathode-ray tube, includes a series of spaced apart, parallel conductive strips on the faceplate or phosphor cooling of the CRT, the spaces between the strips defining a path along which an electron beam produced in the CRT is to be scanned. The electron beam is modulated with a pilot signal and, in the event the beam deviates along the predetermined path between the conductive strips, the pilot signal is detected as a result of the electron beam impinging on one of the strips by an amount greater than the beam impinges on an adjacent strip along the predetermined path, and the beam is returned to the predetermined path by position correction circuitry connected to beam deflection circuitry associated with the CRT. Such beam control arrangement allows for phosphors of different colors to lie between successive sets of the conductive strips, and for one or more electron beams to scan color phosphors to produce a color picture, without the use of a shadow mask or aperture grill in the CRT.

REFERENCES:
patent: 2739260 (1956-03-01), Lawrence
patent: 2885594 (1959-05-01), Lesti
patent: 3383547 (1968-05-01), Alpers
patent: 3569760 (1971-03-01), Fargher
patent: 3800072 (1974-03-01), Lejon
Turner, "An Electron Beam Indexing Color Display System", Oct. 1979.

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