Ferroelectric liquid crystal device with an AC electric field pr

Details Ferroelectric liquid crystal device with an AC electric field pr Ferroelectric liquid crystal device with an AC electric field pr

1991-11-18

1994-04-19

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 78, 359 93, 359100, G02F 11343, G02F 1137, G02F 113

Patent

active

053051270

ABSTRACT:
A ferroelectric liquid crystal device including a pair of substrates each having an electrode, one of the substrates being subjected to an uniaxially-orienting treatment (one direction orientation treatment), and the other being subjected to no uniaxially-orienting treatment, and a layer of ferroelectric liquid crystal material interposed between the substrates is disclosed. The layer includes a liquid crystal region in which stripe patterns occur by application of an alternating electric field to the liquid crystal to scatter light incident to the device. A method of driving a ferroelectric liquid crystal device is also disclosed. The tone and intensity of the incident light can be controlled by controlling a voltage and/or frequency of the alternating electric field in accordance with the method.

REFERENCES:
patent: 4139273 (1979-02-01), Crossland et al.
patent: 4662721 (1987-05-01), Harada et al.
patent: 4834510 (1989-05-01), Fujita
patent: 4924215 (1990-05-01), Nelson
patent: 5046830 (1991-09-01), Nakanowatari
Coates et al., "Electrically Induced Scattering textures in Smectic A Phases and their Electric Reversal", J. Phys. D: Appl. Phys., vol. 11 1978, pp. 2025-2034.
Iwasaki et al., "Colour Switching in Ferroelectric Smectic Liquid Crystal by Electric Field", JPN, J. Appl. Phys. vol. 18, No. 12, 1979, pp. 2323-2324.
Coates et al., "A Variable Tilt Smectic A Electro-optic Effect Giving Stoved Colours", Mol. Cryst. liq. Cryst. vol. 41, 1978, pp. 151-154.

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