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    • 6. 发明授权
    • Smectic liquid crystal composition and liquid crystal display
    • 水晶液晶组成和液晶显示
    • US5972242A
    • 1999-10-26
    • US867665
    • 1997-06-03
    • Kenji TakigawaToshio YamamotoYuichiro YamadaYoshihiko AiharaShigeharu HashimotoYoshiichi Suzuki
    • Kenji TakigawaToshio YamamotoYuichiro YamadaYoshihiko AiharaShigeharu HashimotoYoshiichi Suzuki
    • G02F1/13C07C69/90C09K19/02C09K19/20C09K19/46C09K19/12
    • C09K19/0266C09K19/02C09K19/2021
    • A liquid crystal cell which minimizes disordered orientation occurring with temperature changes even across a wide range, to exhibit good contrast and high reliability, as well as a smectic liquid crystal composition for use the liquid crystal cell are provided. In smectic liquid crystal compositions having a layer construction in the liquid crystal molecular arrangement, it was found that antiferroelectric liquid crystal compositions resistant to variation in the layer spacing of the smectic phase due to temperature changes are resistant to disordered orientation. Specifically, if the antiferroelectric liquid crystal composition contains at lest 45 wt % of an antiferroelectric liquid crystal compound with roughly constant layer spacing in a temperature range from the temperature t.sub.1 which gives the minimum value for the layer spacing of the smectic C.sub.A * phase to -20.degree. C., no disordered liquid crystal orientation results even after cold/hot temperature cycles. An even greater effect is achieved if the spontaneous polarization at of the composition at temperature t.sub.1 is at least 160 nC/cm.sup.2.
    • 提供一种液晶单元,其使得即使在宽范围内随温度变化发生的无序取向最小化,显示出良好的对比度和高可靠性,以及用于液晶单元的近晶液晶组合物。 在具有液晶分子结构的层结构的近晶液晶组合物中,发现由于温度变化而抵抗近晶相的层间距的变化的反铁电液晶组合物抵抗无序取向。 具体地说,如果反铁电液晶组合物在距离给出层状CA *相的层间距的最小值的温度t1的温度范围内至少含有45重量%的具有大致恒定层间距的反铁电液晶化合物, 20℃,即使在冷/热温循环后也不产生无序的液晶取向。 如果组合物在t1温度下的自发极化至少为160nC / cm2,则可获得更大的效果。
    • 9. 发明授权
    • Antiferroelectric liquid crystal composition
    • 反铁电液晶组合物
    • US06267910B1
    • 2001-07-31
    • US08589577
    • 1996-01-22
    • Hitoshi HayashiAkira TakeuchiKatsuhide KikuchiKenji Takigawa
    • Hitoshi HayashiAkira TakeuchiKatsuhide KikuchiKenji Takigawa
    • C09K1952
    • C09K19/0266C09K19/2021
    • An antiferroelectric liquid crystal composition having a chiral smectic CA* phase composed by blending liquid crystal composition-constituting compounds having the same direction of inclination of optic axis produced by application of an electric field and/or comprised of a mixture of two enantiomers of a liquid crystal material; one having the stereosense (+) and the other having the stereosense (−). The stereosense is defined so that, when the molecule is viewed so that the bond between the core group and the asymmetric carbon is behind the asymmetric carbon atom, the stereosense is (+) if the remaining three groups (or atoms) are arranged clockwise in order of length of the groups (or, if the groups are the same length, in order of their volume), and the stereosense is (−) if the groups are arranged counter clockwise.
    • 具有手性近晶CA *相的反铁电液晶组合物,其通过混合通过施加电场产生的具有相同的光轴倾斜方向的液晶组合物构成化合物和/或由液体的两种对映异构体的混合物组成 水晶材料; 一个具有立体声(+),另一个具有立体声( - )。 立体定义被定义为使得当观察到分子使得核心基团和不对称碳之间的键在不对称碳原子之后时,如果剩余的三个基团(或原子)顺时针方向排列,立体声是(+) 组的长度顺序(或者如果组的长度相同,按卷的顺序),并且立体声是( - ),如果组被逆时针排列。