Optical unit, video display apparatus, and color switching...

Details Optical unit, video display apparatus, and color switching... Optical unit, video display apparatus, and color switching...

2005-10-04

2005-10-04

Lee, Michael H. (Department: 2614)

Television

Video display

Color sequential

Reexamination Certificate

active

06952241

ABSTRACT:
A projection-type video display apparatus has a polarizing beam splitter for matching light, which is outputted by a light source unit, to one of S polarizing light and P polarizing light, an optical characteristics switching element for electrically and periodically switching a wavelength band of light outputted by the polarizing beam splitter, a video display element, as a light valve element, for forming an optical image from light outputted by the light source unit, in accordance with a video signal, and a radiating unit for radiating a plurality of color light, which are sequentially outputted by the optical characteristics switching element, to the video display element, wherein light outputted by the video display element is incident on a projecting lens, and a light path from the light source unit to the projecting lens is U-shaped. Consequently, the projection-type video display apparatus becomes compact and has improved contrast.

REFERENCES:
patent: 5347378 (1994-09-01), Handschy et al.
patent: 5921650 (1999-07-01), Doany et al.
patent: 6201901 (2001-03-01), Zhou et al.
patent: 6204901 (2001-03-01), Knox
patent: 6273571 (2001-08-01), Sharp et al.
patent: 0 547 603 (1993-06-01), None
patent: 0 676 740 (1995-10-01), None

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