Electro-optical display element

Details Electro-optical display element Electro-optical display element

1974-09-16

1976-06-01

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 252408, 350150, 350160LC, G02F 116, C09K 334, G02F 113

Patent

active

039607518

ABSTRACT:
An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula: ##SPC1##
Wherein R is an alkyl radical having from 4 to 20 carbon atoms.
Said compounds are pleochroic dyes having a special function which differs from hitherto known dyes in their interaction with nematic liquid crystal molecules. The electro-optical element makes it possible to obtain a liquid crystal display device which exhibits the desired figure in color differing from background colors.

REFERENCES:
patent: 3597044 (1971-08-01), Castellano
patent: 3703329 (1972-11-01), Castellano
patent: 3864022 (1975-02-01), Moriyama et al.
patent: 3900248 (1975-08-01), Nagasaki

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