Liquid crystal apparatus and chiral smectic liquid crystal composition
for use therein
    8.
    发明授权
    Liquid crystal apparatus and chiral smectic liquid crystal composition for use therein 失效
    液晶装置及其使用的CHIRAL SMECTIC LIQUID STYSTAL COMPOSITION

    公开(公告)号:US5119219A

    公开(公告)日:1992-06-02

    申请号:US543415

    申请日:1990-06-26

    摘要: A liquid crystal apparatus includes a chiral smectic liquid crystal showing a first and a second orientation state disposed between first and second electrodes of a liquid cell. A drive circuit applies voltages between the first and second electrodes including voltages .vertline.V.sub.S .vertline. and .vertline.V.sub.I .vertline. which provide voltages V.sub.A and V.sub.B (V.sub.B V.sub.A) satisfying the relationship of: .vertline.(V.sub.A -V.sub.B)/(V.sub.A +V.sub.B).vertline.>0.1 at 40.degree. C. V.sub.A is a minimum peak value of a voltage .vertline.V.sub.S .vertline.+.vertline.V.sub.I .vertline. (at a constant pulse width) capable of inverting the first orientation state of the chiral smectic liquid crystal into the second orientation state when a voltage pulse is applied between the first and second electrodes to cause the first orientation state of the chiral smectic liquid crystal and then the voltage .vertline.V.sub.S .vertline.+.vertline.V.sub.I .vertline. is applied between the first and second electrodes as a combination of a voltage .vertline.V.sub.S .vertline. applied to the first electrode and a voltage - V.sub.I .vertline. applied to the second electrode V.sub.B is a value of .vertline.V.sub.S .vertline.+.vertline.V.sub.I .vertline. calculated based on a maximum peak value of a voltage .vertline.V.sub.S .vertline.-.vertline.V.sub.I .vertline. capable of maintaining the first orientation state of the chiral smectic liquid crystal when a voltage pulse is applied between the first and second electrodes to cause the first orientation state and then the voltage .vertline.V.sub.S .vertline.-.vertline.V.sub.I .vertline. is applied between the first and second electrodes as a combination of a voltage .vertline.V.sub.S .vertline. applied to the first electrode and a voltage .vertline.V.sub.I .vertline. applied to the second electrode.

    Optically active compound, process for producing same and liquid crystal
composition containing same
    10.
    发明授权
    Optically active compound, process for producing same and liquid crystal composition containing same 失效
    光学活性化合物,其制备方法和含有该组合物的液晶组合物

    公开(公告)号:US4798680A

    公开(公告)日:1989-01-17

    申请号:US919376

    申请日:1986-10-16

    IPC分类号: C09K19/06 C09K19/52 C07C31/34

    CPC分类号: C09K19/06

    摘要: An optically active 2-fluoro-1-alkanol compound represented by the formula (Ia): ##STR1## wherein R is an alkyl group having 1-16 carbon atoms, and C* is an asymmetric carbon atom; and an optically active compound derived from the fluoroalkanol and represented by the formula (Ib): ##STR2## wherein R and C* are the same as above, m is 1 or 2, n is 0 or 1, and A is a releasable substituent. Because of the fluorine atom directly attached to an asymmetric carbon atom, these compounds are particularly effective in increasing a spontaneous polarization, improving a electric field responsive characteristic of a liquid crystal composition, and controlling the liquid crystal state.

    摘要翻译: 由式(Ia)表示的光学活性2-氟-1-链烷醇化合物:其中R是具有1-16个碳原子的烷基,C *是不对称碳原子; 和由式(Ib)表示的光学活性化合物:其中R和C *与上述相同,m为1或2,n为0或1,A为 可释放的取代基。 由于氟原子直接连接到不对称碳原子上,这些化合物在增加自发极化,改善液晶组合物的电场响应特性和控制液晶状态方面特别有效。