Illumination system for an LCD display system
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United States of America Patent
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-
Apr 3, 1990
Grant Date -
N/A
app pub date -
Dec 27, 1988
filing date -
Dec 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An illumination system for an LCD projection display system to increase the brightness of the system. The system includes a polarizing beam splitter which splits a beam of light from a light source into two orthogonally polarized beams. The beam of the desired polarization direction is directed through a first face of a prism so that it reflects off of a second face of the prism and exists through a third face. The other beam of the non-desired polarization direction is passed through a device for rotating its polarization 90.degree. and towards the underside of the second face of the prism at an angle such that it is refracted into the prism. Both beams then exit the prism through its third face, have the same polarization direction, and are only slightly divergent. The recombined beam may be thereafter directed towards the light modulation system. The illumination system minimizes the number of air-glass interfaces and the number of reflecting surfaces.
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