Liquid crystal devices with particular cholesteric pitch-cell th

Details Liquid crystal devices with particular cholesteric pitch-cell th Liquid crystal devices with particular cholesteric pitch-cell th

1983-06-17

1986-06-24

Corbin, John K.

350341, 350349, 350350R, G02F 113

Patent

active

045964467

ABSTRACT:
A liquid crystal device comprises a layer of long pitch cholesteric liquid crystal material incorporating a pleochroic dye. The layer is contained between two cell walls surface treated to align liquid crystal molecules in a tilted homogeneous structure. The surface alignment and natural pitch of the cholesteric material are matched to provide a progressive molecular twist of between .pi. and 2.pi., preferably about 3.pi./2, with a uniform tilt direction. The ratio natural pitch P divided by thickness d of the liquid crystal layer is arranged to lie between 0.5 and 1.0, with a value of d less than 20 .mu.m. Both low tilt and high tilt surface alignment may be used separately or in combination. Polarizers may be used to enhance between ON and OFF states. The device has a sharp transmission/voltage characteristic which enables it to be used in large multiplex addressed matrix displays.

REFERENCES:
patent: 3833287 (1974-09-01), Taylor et al.
patent: 4143947 (1979-03-01), Aftergut et al.
patent: 4241339 (1980-12-01), Ushiyama
patent: 4272162 (1981-06-01), Togashi et al.
Patent Abstracts of Japan, vol. 6, No. 46, Mar. 24, 1982.
Applied Physics Letters, vol. 37, No. 1, pp. 109-111.
IEEE Transactions On Electron Devices, vol. ED-28, No. 6, Jun. 1981, pp. 719-725.
Ishibashi, T. et al., "On the Multiplexing of the Phase Change Type Color LCD," 1980 Biennial Display Research Conference, IEEE (Oct. 1980), pp. 186-188.

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