Rear projection television set having improved contrast

Details Rear projection television set having improved contrast Rear projection television set having improved contrast

1990-12-05

1992-08-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 60, 358237, H04N 574

Patent

active

051423731

ABSTRACT:
A rear projection television set is of the construction in which an image light projected from a projection cathode ray tube is reflected by a mirror onto the rear surface of a screen comprising a Fresnel lens and the light passes through the front surface of the screen to be viewed by viewers. The condensing distance of the Fresnel lens is selected to be less than four meters for radii of up to 300(S/40) millimeters of the Fresnel lens when the mirror is positioned relative to the screen such that A.ltoreq.200+(S-40).times.10 millimeters, where S is the diagonal distance of the screen in inches and A is the shortest distance between the mirror and the screen.

REFERENCES:
patent: 4544946 (1985-10-01), VanBreemen
patent: 4556913 (1985-12-01), VanBreeman et al.
patent: 4578710 (1986-03-01), Hasegawa
patent: 4621293 (1986-11-01), Matis
patent: 4707746 (1987-11-01), Nishikawa

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