Projection type color television system

Details Projection type color television system Projection type color television system

1976-12-10

1978-05-02

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 931

Patent

active

040878350

ABSTRACT:
A projection type color television system of the present disclosure comprises three cathode ray tubes each adapted to produce one of three different primary color light beams, a projecting screen and three lens assemblies positioned between the projecting screen and respective cathode ray tubes. The glass faceplate or phosphor screen of the three cathode ray tubes are positioned on an imaginary plane which is in parallel relation to the projecting screen, and principle planes of the three lens assemblies are also position in an another imaginary plane which is in parallel relation to the projecting screen, so that the projected image from any one of cathode ray tubes geometrically overlaps with another projected image from another cathode ray tube. Each cathode ray tube is coupled with a brightness correction circuit for correcting the brightness of the projected image on the projecting screen to be uniform. The projecting screen is formed with two layers for widening the horizontal diffusion and narrowing the vertical diffusion.

REFERENCES:
patent: 2601328 (1952-06-01), Rosenthal

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