Multimedia projection system with image quality correction

Details Multimedia projection system with image quality correction Multimedia projection system with image quality correction

1998-02-25

1999-11-02

Dowling, William

Optics: image projectors

Polarizer or interference filter

353119, 349 5, G03B 2114

Patent

active

059757043

ABSTRACT:
A multimedia projector comprises a optical frame that mounts, from back to front, a light source, a back fresnel lens, a back polarizer, an LCD display object, a front polarizer, a front fresnel lens, and a front lens group for projecting images formed by the LCD display object. To provide contrast adjustment, a contrast adjustment mechanism is attached to the back polarizer to permit the manual selective tilting of the back polarizer about an axis extending perpendicular to the front polarizer, in order to optimize contrast of images projected by the front lens group.

REFERENCES:
patent: 3177761 (1965-04-01), Redner
patent: 3315391 (1967-04-01), Labe et al.
patent: 3600076 (1971-08-01), Synder
patent: 4838655 (1989-06-01), Hunahata et al.
patent: 5048931 (1991-09-01), Magocs
patent: 5092671 (1992-03-01), Van Os
patent: 5255029 (1993-10-01), Vogeley et al.
patent: 5694164 (1997-12-01), Choi

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