Optical collimating device employing cholesteric liquid crystal

Details Optical collimating device employing cholesteric liquid crystal Optical collimating device employing cholesteric liquid crystal

1993-10-20

1995-04-18

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 38, 359 70, 359629, 359631, 359634, 359641, G02B 2714, G02F 113

Patent

active

054083460

ABSTRACT:
An optical collimating device employs an optical (concave) mirror and cholesteric liquid crystal element to collimate and project image light into the line-of-sight of an observer in efficient manner. Image light is generated with light components within a predetermined bandwidth and with a predetermined rotary sense. The image light is directed so that it is reflected by the concave mirror, expanding (collimating) the image light, projecting in onto a cholesteric liquid crystal element that reflects those components of the image light within the bandwidth B and having the proper rotary sense of circular polarization. The cholesteric liquid crystal element substantially reflects the returned image to the observer.

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