Front projection screen

Details Front projection screen Front projection screen

1988-12-23

1990-03-27

Wintercorn, Richard A.

350129, G03B 2160

Patent

active

049115294

ABSTRACT:
A front projection screen comprises a transparent plate, the front and rear sides of which have linear Fresnel structures crossing each other and whose rear side is reflective. The riser facets, termed edges, of at least the rear Fresnel lens structure, are substantially perpendicular to the plane of the plate. Ambient light incident on the screen leaves the screen on the rear side via the edges on the rear side or are absorbed by light absorbing material on the edges. This results in an enhancement of the contrast in the observed picture. Further measures enhancing the contrast are the provision of wedge-shaped indentations in the rear side of the plate.

REFERENCES:
patent: 4152047 (1979-05-01), Inoue
patent: 4206969 (1980-06-01), Cobb et al.
patent: 4756603 (1988-07-01), Ohtani
patent: 4767186 (1988-08-01), Bradley, Jr. et al.

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