One-piece projection screen

Details One-piece projection screen One-piece projection screen

1987-08-28

1988-09-27

Wintercorn, Richard A.

G03B 2160

Patent

active

047737310

ABSTRACT:
A one-piece projection screen with improved overall efficiency and contrast, the elimination of corner illumination deficiencies and undesirable image artifacts. The optical power of the screen is divided between two or more surfaces acting as Fresnel lenses, and the region or medium separating the surfaces has a different index of refraction than that of the mediums upstream or downstream of the surfaces. The preferred embodiment of the projection screen includes a diffuser and a lenticular array downstream of the surfaces.

REFERENCES:
patent: 4053208 (1977-10-01), Kato et al.
patent: 4679900 (1987-07-01), McKechnie et al.

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