Projection image display apparatus
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United States of America Patent
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-
Oct 27, 1998
Grant Date -
N/A
app pub date -
May 7, 1997
filing date -
May 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An object of the present invention is to provide a simple image projection apparatus which prevents color shading. First, second and third dichroic mirrors are provided in parallel which separate light from a source into red, blue, and green components. First and second polarization beam splitters are provided with operative surfaces perpendicular to the dichroic mirrors for reflecting predetermined polarization light components of two colors to two reflection type liquid crystal devices. A third polarization beam splitter having an operative surface in parallel to the dichroic mirrors is provided for reflecting a predetermined polarized light component of the third color component to a third reflection type liquid crystal device. A cross dichroic prism device is provided for combining the modulated light from the three liquid crystal devices and transmitting the synthesized light for projection.
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