Television – Video display – Projection device
Patent
1997-10-31
2000-06-20
Peng, John K.
Television
Video display
Projection device
348756, 348762, 348767, 349 9, H04N 574, G02F 100
Patent
active
06078363&
ABSTRACT:
A projection-type image display apparatus, includes: an illumination unit; a polarization selecting and reflecting element which splits a light beam from the illumination unit into a first light beam and a second light beam having polarization states different from each other, reflects the first light beam to the illumination unit, and outputs the second light beam as linearly polarized light; a transmission-type liquid crystal display panel which controls a polarization state of the linearly polarized light and displays an image; a first polarization selecting element and a second polarization selecting element respectively provided on a light beam input side and a light beam output side of the transmission-type liquid crystal display panel; a projection element which projects the image displayed by the transmission-type liquid crystal display panel. A combination of the polarization selecting and reflecting element and the first polarization selecting element has a degree of polarization of at least about 99%, and at least one of the polarization selecting and reflecting element and the first polarization selecting element has a degree of polarization of less than about 99%.
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Masuda Takeshi
Yamatani Takuji
Lo Linus H.
Peng John K.
Sharp Kabushiki Kaisha
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