Polarization independent liquid crystal phase gratings for refle

Details Polarization independent liquid crystal phase gratings for refle Polarization independent liquid crystal phase gratings for refle

1997-04-02

1999-03-16

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal optical element

Liquid crystal diffraction element

349129, 349180, 349181, G02F 113

Patent

active

058836870

ABSTRACT:
A liquid crystal (LC) cell having LC phase gratings is disclosed. The LC cell includes alternating strips of a first single domain LC material having a twist angle with a magnitude and a positive sign, and a second single domain LC material having a twist angle with the same magnitude and a negative sign. The magnitude of the twist angle is approximately from 45 to 70 degrees. The first and second LC materials are twisted nematic LC materials or ferro-electric LC materials. The liquid crystal phase gratings operate preferably in a normally-black condition with low operating voltages of below 3 V and high optical diffraction efficiencies. The LC cell is used in reflective or transmissive spatial light modulators of displays.

REFERENCES:
patent: 4896947 (1990-01-01), Leenhouts
patent: 4952030 (1990-08-01), Nakagawa et al.
patent: 5105289 (1992-04-01), Sonehara et al.
patent: 5638201 (1997-06-01), Bos et al.
patent: 5726723 (1998-03-01), Wang et al.
Fritsch, M. et al. (1989) "A Liquid-Crystal Phase Modulator for Large-Screen Projection" IEEE Transactions on Electron Devices, vol. 36, No. 9, pp. 1882-1887.
Gibbons, W.M. et al. (1991) "Surface-Mediated Alignment of Nematic Liquid Crystals with Polarized Laser Light" Nature, vol. 351, pp. 49-50.
Howard, W.E., "Active Matrix LCDs", Seminar Lecture Note of the 1989 SID International Symposium, pp. F-2/3 to F-2/31.
Hori, Y. et al. (1979) "Field-Controllable Liquid-Crystal Phase Grating" IEEE Transactions on Electron Devices, vol. ED-26, No. 11, pp. 1734-1737.
Bos, P.J. et al. (1995) "An Optically Active Diffractive Device of a High-Efficiency Light Valve", SID 95 Digest, pp. 601-604.

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