Device and method for the temperature-independent operation...

Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within smectic phase

Reexamination Certificate

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C349S100000, C349S133000, C349S181000

Reexamination Certificate

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06900874

ABSTRACT:
In order to substantially reduce temperature-dependent influences and attendant long switching times in the case of an optical liquid crystal modulator having at least one ferroelectric liquid crystal and in a method for operating an optical liquid crystal modulator, the ferroelectric liquid crystals are provided to have a DHF mode and to exhibit an operating range of an electric field of more than 20 V/μm at the location of the liquid crystal.

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*Fünfschilling, J. and Schadt, M., “Performance of Conventional and Novel Deformed Helix Ferroelectric Liquid Crystal Display Operating Modes”, Japanese Journal of Applied Physics, Nov. 1, 1996, vol. 35, No. 11, part 01, pp. 5765-5774.
*Abdulhalim, I. and Moddel, G., “Electrically and Optically Controlled Light Modulation and Color Switching Using Helix Distortion of Ferroelectric Liquid Crystals”, Molecular and Liquid Crystals, May 1, 1991, vol. 200, pp. 79-101.
*Pozhidaev, E. et al., “High Frequency and High Voltage Mode of Deformed Helix Ferroelectric Liquid Crystals in a Broad Temperature Range”, Seventh International Conference on Ferroelectric Liquid Crystals, Darmstadt, Germany, Aug. 29-Sep. 3, 1999, vol. 246, No. 1-4, pp. 1141-1151.
**Walker, D.B. et al., “Ferroelectric liquid-crystal waveguide modulation based on a switchable uniaxial-uniaxial interface”, Applied Optics, Jun. 1, 1996, vol. 35, No. 16, pp. 3016-3030.

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