High contrast distorted helex effect electro-optic devices and t

Details High contrast distorted helex effect electro-optic devices and t High contrast distorted helex effect electro-optic devices and t

1992-02-07

1996-07-23

Gross, Anita Pellman

Optical: systems and elements

Optical computing without diffraction

359 90, 359 76, 359 78, 359104, 25229901, 2522996, G02F 1141, C09K 1900

Patent

active

055395554

ABSTRACT:
Fast response, high contrast Ferroelectric Liquid Crystal (FLC) electro-optic devices in which the FLC retains a helical director structure stable to unwinding are provided. In particular, high contrast distorted helix FLC electro-optic devices including half-wave plates in the visible wavelength region are provided. The FLC cells of this invention incorporate chiral FLCs which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase. The natural helix pitch of the FLC in the ferroelectric phase is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in the device to achieve high contrast.

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