Chiral smectic liquid crystal element having uniform high temper

Details Chiral smectic liquid crystal element having uniform high temper Chiral smectic liquid crystal element having uniform high temper

1994-07-11

1996-01-02

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359100, G02F 113, G02F 11337

Patent

active

054813875

ABSTRACT:
A ferroelectric liquid crystal element has a ferroelectric liquid crystal with an orientation state represented by .theta.<.alpha.+.delta. wherein .alpha. is a pretilt angle of the ferroelectric liquid crystal, .theta. is a tilt angle, and .delta. is an inclination angle of an Sm*C layer. In another embodiment is a liquid crystal element having a chiral smectic liquid crystal satisfying T.sub.1 /T.sub.2 <2.5 in a first orientation state wherein T.sub.2 is a pulse width threshold values of a portion in a second orientation state adjacent lightning and hairpin defects and T.sub.1 is a pulse width threshold value in a first orientation state of a portion outside of the T.sub.2 portion. In both embodiments, the ferroelectric liquid crystal exhibits at least two stable states in orientation. An angle .theta..sub.a midway between optical axes of these two stable states and the tilt angle 8 of the ferroelectric liquid crystal satisfy the condition .theta.>.theta..sub.a >.theta./2.

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