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Liquid crystal device and liquid crystal apparatus

  • US 6,177,152 B1
  • Filed: 10/18/1996
  • Issued: 01/23/2001
  • Est. Priority Date: 10/20/1995
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal device, comprising:

  • a pair of substrates each having thereon at least an electrode, and a liquid crystal composition disposed between the substrates, wherein at least one of the substrates is provided with an alignment control layer having a thickness of at most 200 Å and

    having been subjected to a rubbing uniaxial aligning treatment, and the liquid crystal composition comprises;

    (i) at least one species of a fluorine-containing mesomorphic compound (B) represented by a formula (II) comprising at least one catenary oxygen atom, a fluorocarbon terminal portion and a hydrocarbon terminal portion, the terminal portions being connected with a central core, said compound (B) having smectic C phase and providing a tilt angle below 30 degrees at a temperature 15°

    C. below an upper limit temperature of said smectic C phase; and

    (ii) at least one species of compound (C) in an amount at least 5 wt. % represented by the formula (II) comprising at least one catenary oxygen atom, a fluorocarbon terminal portion and a hydrocarbon terminal portion, the terminal portions being connected with a central core and having a smectic C phase and which provides a tilt angle of at least 30 degrees at a temperature 15°

    C. below an upper limit temperature of said smectic C phase;

    the liquid crystal composition containing said compounds (B) and (C) in a total amount of at least 30 wt. %;

    where A4, A5 and A6 are each independently denote gb, hb and ib are each independently an integer of 0-3 with the proviso that the sum of gb+hb+ib be at least 2;

    each L3 and L4 are independently a single bond, —

    CO—

    O—

    , —

    O—

    CO—

    , —

    CO—

    S—

    , —

    S—

    CO—

    , —

    CO—

    Se—

    , Se—

    CO—



    CO—

    Te—

    , —

    Te—

    CO—

    , —

    (CH2CH2)ka

    (ka is 1-4), —

    CH═

    CH—

    , —

    C≡

    C, —

    CH═

    N—

    , —

    N═

    CH—

    , —

    CH2

    O—

    , —

    O—

    CH2

    , —

    CO—

    or —

    O—

    ;

    X2, Y2 and Z2 are each a substituent of A4, A5 and A6, respectively, and each X2, Y2 and Z2 are independently —

    H, —

    Cl, —

    F, —

    Br, —

    I, —

    OH, —

    OCH3, —

    CH3, —

    CF3, —

    O—

    CF3, —

    CN or —

    NO2;

    each jb, mb and nb are independently an integer of 0-4;

    J2 is —

    CO—

    O—

    CrcH2rc

    , —

    O—

    CrcH2rc

    , —

    CrcH2rc

    , —

    O—

    (CsaH2sa

    O)ta

    CrdH2rd

    , —

    O—

    SO2

    , —

    SO2

    , —

    SO2

    CrcH2rc

    , —

    CrcH2rc

    N(CpbH2pb+1)—

    SO2

    or —

    CrcH2rc

    N(CpbH2pb+1)—

    CO—

    where rc and rd are independently 1-0;

    sa is independently 1-10 for each (CsaH2sa

    O), ta is 1-6;

    pb is 0-4;



    R4 is —

    O—

    (CqcH2qc

    O)wa

    CqdH2qd+1, —

    (CqcH2qc

    O)wa

    CqdH2qd+1, —

    CqcH2qc

    R6, —

    O—

    CqcH2qc

    R6, —

    CO—

    O—

    CqcH2qc

    R6, or O—

    CO—

    CqcH2qc

    R6 which may either be straight chain or branched where R6 is —

    O—

    CO—

    CqdH2qd+1;



    CO—

    O—

    CqdH2qd+1, —

    Cl, —

    F, —

    CF3, —

    NO2, —

    CN or —

    H, qc and qd are independently 1-20;

    wa is 1-10; and

    R5 is (CxbF2xb

    O)za

    CyaF2ya+1, where xb is independently 1-10 for each (CxbF2xb

    O);

    ya is 1-10; and

    za is 1-10.

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