Optical systems for projection displays
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United States of America Patent
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Oct 8, 2002
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
Jun 29, 1999
priority date (Note) -
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Abstract
A prism (13) for use in a projection system which employs a digital light panel (35) is provided. The prism includes first (19) and second (21) spaced part surfaces which are oriented such that: (a) light from a light source (33) will pass through the spaced apart surfaces to the digital light panel; (b) light from 'on' pixels will undergo total internal reflection at the second surface (21) and be directed into the acceptance angle of a projection lens (39); and (c) light from 'off' pixels which reflects from the second surface will be directed away from the lens' acceptance angle.
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