Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within cholesteric phase
Patent
1997-07-29
2000-11-07
Sikes, William L.
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Within cholesteric phase
349175, 349 57, 345 7, 359235, 359635, G02F 113, G02F 11335
Patent
active
061444391
ABSTRACT:
A collimating apparatus that reduces ghost images in the field of view of a main image generated. The collimating apparatus includes a meniscus lens having a reflective concave surface; a cholesteric liquid crystal (CLC), aligned on an axis common with the meniscus lens, disposed on the concave side of the meniscus lens, positioned to reflect light onto the concave surface and having a tilt making the normal of the CLC different from the normal of the meniscus lens; and an image source, disposed on the convex side of the meniscus lens and having a tilt corresponding to the tilt of the CLC. The tilted pair of the meniscus and image source direct any ghost images produced by light leaking through the CLC away from the line of sight of an observer of the main image.
REFERENCES:
patent: 3915548 (1975-10-01), Opittek et al.
patent: 4093347 (1978-06-01), La Russa
patent: 5050966 (1991-09-01), Berman
patent: 5671091 (1997-09-01), Monroe et al.
patent: 6038054 (2000-03-01), Sakai et al.
Kaiser Electro-Optics, Inc.
Ngo Julie
Sikes William L.
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