High contrast front projection display screen

Details High contrast front projection display screen High contrast front projection display screen

1992-05-01

1993-05-11

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

With lens

359459, G03B 2160

Patent

active

052106411

ABSTRACT:
Disclosed is a front projection display screen formed from a multiplicity of optical cells juxtaposed to define a surface. Each of the cells comprises a directional filter and light converging optics. The directional filter, which covers substantially all of the face of the optical cell, is adapted to pass light from the direction of the projector and to absorb light from other directions except at a small, transparent return aperture. The light converging optics are adapted to focus the substantially parallel light from the projector at the return aperture part of the directional filter and to spread it into a large solid angle. The combination provides an image of improved visual contrast by absorbing background light and returning image light to viewers.

REFERENCES:
patent: 1942841 (1931-12-01), Shimizu
patent: 2358070 (1942-06-01), Holmes
patent: 2991693 (1961-07-01), MacNeille
patent: 3180214 (1965-04-01), Fox
patent: 3191495 (1965-06-01), Miller
patent: 3704055 (1972-11-01), Hong
patent: 4026634 (1977-05-01), Fukushima
patent: 4235513 (1980-11-01), Vlahos
patent: 4298246 (1981-11-01), Iwamura
patent: 4606609 (1986-08-01), Hong

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