Optics: image projectors – Plural projection paths with single light source
Patent
1988-12-27
1990-04-03
Miller, Stanley D.
Optics: image projectors
Plural projection paths with single light source
350331R, 350334, 350401, 350402, 353 81, 358 60, 358 61, G02F 1133, G02B 530, G03B 2128, H04N 931
Patent
active
049135295
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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Eskin Joshua D.
Goldenberg Jill F.
Botjer William L.
Gross Anita Pellman
Miller Stanley D.
North American Philips Corp.
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