Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-01-26
1996-09-17
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359100, G02F 113
Patent
active
055574351
ABSTRACT:
A chiral smectic liquid crystal device is constituted by a chiral smectic liquid crystal, and a pair of substrates sandwiching the liquid crystal with their opposite surfaces that are provided with electrodes for applying a voltage to the liquid crystal and uniaxial alignment axes which are parallel or substantially parallel to each other and identical in direction. The liquid crystal device is provided with excellent bistability and freeness from "burning" if the liquid crystal is placed in the alignment state characterized in that (A) a relationship of .alpha.<H is satisfied, wherein a denotes a pretilt angle and H denotes a tilt angle, respectively, of the liquid crystal and (B) the liquid crystal provides at least two stable states of optical axes which form an angle 2.theta.a therebetween satisfying H>.theta.a>H/2.
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Hiruoka et al, "Electric-Field Induce Apparent Tilt Angle and Devils Staircase," JJ of Applied Physics, vol. 30, #10A, Oct. 1991.
Koden, et al., Jap. Journal Applied Physics, vol. 30, No. 10(1991) 1823-5.
Hanyu Yukio
Kodera Yasuto
Mihara Tadashi
Nakamura Katsutoshi
Canon Kabushiki Kaisha
Parker Kenneth
Sikes William L.
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