Title: Mixture of disc-like liquid crystals, electro-optical device using such a mixture and process for orienting the molecules of the mixture

Abstract: A mixture of liquid crystals having a mesophase of the disc-like with wires-type, where a sensitivity to the electrical field can be observed and application can be made to visual display cells. The mixture comprises two hexasubstituted triphenylene derivatives, to the nucleus of which are fixed six identical radicals in positions 2, 3, 6, 7, 10 and 11, which can be alkyl, alkoxy, alkylcarboxylate, alkylbenzoate, and alkoxybenzoate radicals. The electro-optical devices can either be of the variable birefringence type when the liquid crystal molecules have their optical axes parallel to one another and to the walls of a display cell, or of the type with a variable rotatory power under the action of an electrical field when a helical type arrangement is used, or finally, under the effect of a relatively strong field, of the type with dynamic light diffusion.

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Inventors: Dubois, Jean-claude (Paris, FR)
Zann, Annie (Paris, FR)
Billard, Jean (Paris, FR)
Hareng, Michel (Paris, FR)

Application Number: 06/212598
Filing Date: 1980-12-03
Publication_date: 1982-06-08
Assignee: Thomson, Csf

Primary Class(es): 252/299.400 252/299.620, 252/299.600
Other Classes: C09K19/32; G02F1/1337; G02F1/13; C09K3/34; G02F1/13
US Patent Ref:
Other Refs: FR2297201FR2377441

August, 1976	252/299.01
August, 1978	252/299.01

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Primary Examiner: Gron, Teddy S.
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier

Claims: