Off axis fresnel reflector for liquid crystal display

Details Off axis fresnel reflector for liquid crystal display Off axis fresnel reflector for liquid crystal display

1988-09-12

1990-07-24

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG4, 353 38, G03B 2100

Patent

active

049431560

ABSTRACT:
A liquid crystal display assembly for use with a reflective type overhead projector includes a liquid crystal display and an attached Fresnel reflector portion which is off-axis in that the center of the reflector is not included in the Fresnel reflector portion so that a spurious bright spot coinciding in the projected image with the center of the Fresnel reflector is eliminated.

REFERENCES:
patent: 3293982 (1966-12-01), Appeldorn
patent: 3708222 (1973-01-01), Stern
patent: 4652101 (1987-03-01), Grunwald
W. C. Connolly, "Projected Liquid-Crystal Computer Displays", The Physics Teacher, Sep. 1955, pp. 382-383.

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