Television – Video display – Color sequential
Reexamination Certificate
2011-04-19
2011-04-19
Lee, M. (Department: 2422)
Television
Video display
Color sequential
C348S760000
Reexamination Certificate
active
07929064
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.
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Imahase Taro
Kabuto Nobuaki
Ouchi Satoshi
Hitachi , Ltd.
Lee M.
McDermott Will & Emery LLP
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