Compositions – Liquid crystal compositions
Patent
1995-05-26
1998-05-19
Wu, Shean C.
Compositions
Liquid crystal compositions
2522992, 25229961, 25229963, 25229966, 25229967, C09K 1952, C09K 1934, C09K 1930
Patent
active
057531390
ABSTRACT:
Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials 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 an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.
REFERENCES:
patent: 4722594 (1988-02-01), Crossland et al.
patent: 4783148 (1988-11-01), Tsuboyama et al.
patent: 4799775 (1989-01-01), Crossland et al.
patent: 4852978 (1989-08-01), Davey et al.
patent: 5046830 (1991-09-01), Nakanowatori
patent: 5051506 (1991-09-01), Wand et al.
patent: 5061047 (1991-10-01), Bradshaw et al.
patent: 5109295 (1992-04-01), Sato et al.
patent: 5168381 (1992-12-01), Walba et al.
patent: 5380460 (1995-01-01), Wand et al.
Armitage, D. (1991) Mol. Cryst. Liq. Cryst. 199:97-100.
Armitage, D. (1990) Proceedings of SPIE--The International Society for Optical Engineering 1257:116-124.
Funfschilling, J. and Schadt, M. (1989) J. Appl. Phys. 66(8): 3877-3882.
Vohra Rohini T.
Wand Michael D.
Displaytech, Inc.
Wu Shean C.
LandOfFree
High contrast distorted helix effect electro-optic devices and t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High contrast distorted helix effect electro-optic devices and t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High contrast distorted helix effect electro-optic devices and t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1849784