Liquid-crystalline medium

Details Liquid-crystalline medium Liquid-crystalline medium

2007-04-10

2007-04-10

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299630, C252S299660, C252S299670

Reexamination Certificate

active

10885731

ABSTRACT:
Described are media for liquid-crystal applications where the media include a mixture of polar compounds of positive dielectric anisotropy. The mixtures include one or more compounds of the formula Iin which: R1is a halogenated or unsubstituted alkyl or alkoxy radical having from 1 to 15 carbon atoms, where one or more CH2groups in these radicals are optionally, independently of one another, replaced by —C≡C—, —CH═CH—, —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another; X is F, Cl, CN, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having 1 to 6 carbon atoms; and L1and L2are each, independently of one another, H or F. It being provided that the media exhibit a TN threshold of below 1.3V.

REFERENCES:
patent: 6007740 (1999-12-01), Andou et al.
patent: 6187223 (2001-02-01), Andou et al.
patent: 6231785 (2001-05-01), Kondo et al.
patent: 6335064 (2002-01-01), Tomi et al.
patent: 6811834 (2004-11-01), Tomi et al.
patent: 6827990 (2004-12-01), Heckmeier et al.

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