Optical elements having image-forming, color- and polarization-s

Details Optical elements having image-forming, color- and polarization-s Optical elements having image-forming, color- and polarization-s

1994-08-22

1997-10-28

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 8, 349160, 349176, 349200, G02F 11335, G02F 11333, G02F 113

Patent

active

056822120

ABSTRACT:
The invention relates to optical elements having image-forming, color- and polarization-selective reflection and containing cholesteric liquid crystals, and to the preparation and use of these elements. In the wavelength- and polarization-selective elements which form an optical image, at least one cholesteric liquid crystal is enclosed in the cavity of constant thickness between two light-transmitting substrates having curved surfaces in such a way that the helix axis of the liquid crystal is aligned perpendicular to the curved surface of the light-transmitting substrates. The elements are suitable for use as beam splitters or recombiners in projection displays.

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