Optical device with light path changing element and projection-t

Details Optical device with light path changing element and projection-t Optical device with light path changing element and projection-t

1999-03-15

2000-10-24

Dowling, William

Optics: image projectors

Unitary plural refracting surfaces

353 81, 362308, B03B 2114

Patent

active

061355984

ABSTRACT:
A projection-type display apparatus includes a light source, a liquid crystal panel, and a light path changing element arranged between the light source and the liquid crystal panel for changing a light path so that a light beam emitted by the light source and going to the central portion of the liquid crystal panel is bent toward the peripheral portion of the liquid crystal panel. Therefore, a uniform illuminance distribution and a uniform color distribution are ensured.

REFERENCES:
patent: 5005968 (1991-04-01), Tejima et al.
patent: 5250967 (1993-10-01), Miyashita
patent: 5580144 (1996-12-01), Stroomer
patent: 5617152 (1997-04-01), Stolov
patent: 5808759 (1998-09-01), Okamori et al.
patent: 5844638 (1998-09-01), Ooi et al.
patent: 5938307 (1999-08-01), Hamada et al.

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