Projection type image display apparatus
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United States of America Patent
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-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Jun 17, 1998
filing date -
Jun 20, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection type image display apparatus of the present invention includes: a light source; a polarization selective reflection element having a function of reflecting or transmitting a light beam from the light source in accordance with a polarization direction thereof; and an element for modulating a polarization plane of an incident light beam in accordance with an image to be displayed. The polarization selective reflection element is film-like and has an optical transmission axis and an optical reflection axis. The polarization selective reflection element transmits a first linearly polarized light beam, and reflects a second linearly polarized light beam having a polarization plane orthogonal to a polarization plane of the first linearly polarized light beam, regardless of a direction of incidence of a light beam with respect to the polarization selective reflection element.
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