Projection system having low astigmatism
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United States of America Patent
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-
Feb 12, 2008
Grant Date -
Jul 8, 2004
app pub date -
Dec 18, 2003
filing date -
Jun 11, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Generally, the present invention relates to an apparatus for reducing astigmatism in a projection system that is particularly well suited to reducing astigmatism in LCD projection systems. A projection system includes a light source to generate light, conditioning optics to condition the light from the light source and an imaging core to impose on image on conditioned light from the conditioning optics to form image light. The imaging core includes a polarizing beamsplitter and at least one imager, and at least one element in the imaging core is adapted to reduce astigmatism in the image light. The astigmatism may arise in the polarizing beamsplitter. A projection lens system projects the astigmatism-reduced image light from the imaging core.
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