Rear pojection screen

Details Rear pojection screen Rear pojection screen

1997-03-21

1999-03-30

Malley, Daniel P.

Optical: systems and elements

Projection screen

Embedded particles

G03H 120

Patent

active

058896120

ABSTRACT:
A rear projection screen is described, which comprises an optically transparent plate, a first surface of which is provided with a structure of juxtaposed cylindrical lenses which extend in a first direction and a second, opposite surface intended to be directed towards an audience space is provided with strips of a light-absorbing material. These strips also extend in the first direction. On the second surface the plate comprises diffusing means which are formed by a single element by means of a hologram, which element diffuses the light simultaneously in the first direction at a first angle and in a second direction, perpendicular to the first direction, at a second angle, the first and the second angle being different from each other.

REFERENCES:
patent: 3832032 (1974-08-01), Shimada
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4566756 (1986-01-01), Heijnemans
patent: 5046793 (1991-09-01), Hockley et al.
patent: 5066099 (1991-11-01), Yoshida et al.
"Holographic Diffusers for LCD Backlights and Projection Screens"by J.M. Tedesco et al. in SID 93 Digest, pp. 29-32.

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