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Liquid-crystal medium, and electro-optical display containing the medium

  • US 20020084443A1
  • Filed: 03/26/2001
  • Published: 07/04/2002
  • Est. Priority Date: 03/24/2000
  • Status: Active Grant
First Claim
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1. A nematic liquid-crystal medium comprising:

  • a) one or more dielectrically negative compound(s) of formula I in which R11 is alkoxy having 1 to 7 carbon atoms or alkenyloxy having 2 to 7 carbon atoms, and, in the case where R11 can also be alkyl having 1 to 7 carbon atoms; and

    R12 is alkyl having 1 to 7 carbon atoms, alkoxy having 1 to 7 carbon atoms, alkenyloxy having 2 to 7 carbon atoms, b) one or more dielectrically negative compound(s) of formula II in which R21 is alkyl having 1 to 7 carbon atoms, alkoxy having 1 to 7 carbon atoms, or alkenyloxy having 2 to 7 carbon atoms, R22 is alkyl having 1 to 7 carbon atoms, alkoxy having 1 to 7 carbon atoms, or alkenyloxy having 2 to 7 carbon atoms, Z21 and Z22 are, in each case, independently, —

    CH2

    CH2-, —

    CH═

    CH—

    , —

    C—

    C—

    , —

    COO—

    or a single bond, are, in each case, independently, L21 and L22 are both C—

    F or one of the two is N and the other is C—

    F, and I is 0 or 1, the compounds of the formulae I and III being excluded, c) optionally one or more dielectrically negative compound(s) of the formula III in which R31 and R32 are each, independently, alkyl having 1 to 7 carbon atoms, alkoxy having 1 to 7 carbon atoms or alkenyloxy having 2 to 7 carbon atoms, Z31 is —

    CH2

    CH2

    , —

    CH═

    CH—

    , —

    C═

    C—

    , —

    COO—

    or a single bond, L31 and L32 are both C—

    F or one of the two is N and the other is C—

    F, and L33 and L34 are both C—

    F or one of the two is N and the other is C—

    F.

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