Rear projection screen with high off-axis sunlight rejection

Details Rear projection screen with high off-axis sunlight rejection Rear projection screen with high off-axis sunlight rejection

1994-10-06

1996-08-06

Dowling, William

Optics: image projectors

Cabinet encloses projector and one side of screen

353 97, 359 49, G03B 2100

Patent

active

055438709

ABSTRACT:
A projection system having a rear projection screen (28) employs a collimating lens (26) in the form of a Fresnel lens adjacent the rear surface of the screen (28) to improve the image luminance at various viewing angles and provide uniform brightness over the area of the screen. A fiber optic face plate (30) or two crossed films of microlouver light control material is interposed between the collimating Fresnel lens (26) and the rear of the projection screen (28) to provide a high degree of blocking of high intensity light, such as sunlight, that may impinge upon the front of the screen. The optical fibers (42) of the fiber optic face plate have a low numerical aperture and an opaque cladding. The arrangement allows an image to be provided on the screen with high contrast even in the presence of sunlight striking the screen.

REFERENCES:
patent: 4735495 (1988-04-01), Henkes
patent: 4882617 (1989-11-01), Vriens
patent: 4961642 (1990-10-01), Ogino
patent: 5135300 (1992-08-01), Toide et al.
patent: 5159478 (1992-10-01), Akiyama et al.
patent: 5184238 (1993-02-01), Wright
Patent Abstracts of Japan; vol. 8, No. 92 (P-271); 27 Apr., 1984; and JP-A-59 007 928 (ALPS DENKI KK); 17 Jan. 1984; Abstract; "Transmission Type Liquid Crystal Display Device".

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