Liquid crystal devices

Details Liquid crystal devices Liquid crystal devices

1975-11-17

1977-01-18

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

350160LC, C09K 334, G02F 113

Patent

active

040038440

ABSTRACT:
The addition of certain nitrobenzene compounds to liquid crystal compositions having positive dielectric anisotropy, lowers the threshold voltage of electro-optic cells including such compositions. The nitrobenzene compounds have the formula ##STR1## wherein R is an alkyl group of 1-20 carbon atoms, X.sub.1 and X.sub.3 can be hydrogen or nitro and X.sub.2 can be hydrogen, --NO.sub.2, ##STR2## or--O--CH.sub.2 CN, with the proviso that at least one of X.sub.1, X.sub.2 or X.sub.3 is a radical other than hydrogen.

REFERENCES:
patent: 3815972 (1974-06-01), Hsieh
patent: 3915883 (1975-10-01), VAN Meter et al.
patent: 3947375 (1976-03-01), Gray et al.
Elliott, G., et al., Electronics Letters, vol. 9, No. 17, pp. 399-401 (8/73).

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