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    • 1. 发明授权
    • Chiral smectic liquid crystal device and display apparatus
    • 手性近晶体液晶装置及显示装置
    • US5453861A
    • 1995-09-26
    • US252535
    • 1994-06-01
    • Kenji ShinjoHiroyuki KitayamaMasanobu AsaokaMasahiro TeradaSyuji YamadaHiroshi Mizuno
    • Kenji ShinjoHiroyuki KitayamaMasanobu AsaokaMasahiro TeradaSyuji YamadaHiroshi Mizuno
    • G02F1/1337G02F1/141G02F1/13G02F1/1343
    • G02F1/1416G02F2001/133746
    • A liquid crystal device showing improved uniform alignment characteristic and switching characteristic is constituted by a pair of an upper substrate and a lower substrate, and a chiral smectic liquid crystal disposed between the upper and lower substrates. Each of the upper and lower substrates has thereon an electrode for applying a voltage to the liquid crystal and a uniaxial alignment film. The alignment films on the upper and lower substrates are provided with uniaxial alignment axes which cross each other so that the direction of crossing of the uniaxial alignment axes from the lower substrate to the upper substrate is identical to the direction of helical twist in cholesteric phase of the chiral smectic liquid crystal, and the chiral smectic liquid crystal is disposed in such an alignment state that the liquid crystal shows a pretilt angle .alpha., a cone angle H, an inclination angle .delta. of SmC.sup.* layer, and an apparent tilt angle .theta.a satisfying relationships of: H .theta.a>H/2. The crossing direction may preferably have a polarity (taken as "positive" in clockwise direction and "negative" in anticlockwise direction) which is the same as the polarity of the spontaneous polarization of the liquid crystal.
    • 显示出改善的均匀取向特性和切换特性的液晶装置由一对上基板和下基板以及设置在上基板和下基板之间的手性近晶液晶构成。 上基板和下基板都具有用于向液晶施加电压的电极和单轴取向膜。 上基板和下基板上的取向膜具有彼此交叉的单轴对准轴,使得单轴对准轴从下基板到上基板的交叉方向与胆甾醇相的螺旋扭转方向相同 手性近晶液晶和手性近晶液晶以这样的取向状态设置,使得液晶显示预倾角α,锥角+ E,crc / H /,SmC *层的倾斜角度δ,以及 满足以下关系的明显倾斜角θa:+ E,crc / H /α+δ和+ E,crc / H />θa> + E,crc / H / / 2。 交叉方向可以优选地具有与液晶的自发极化的极性相同的极性(顺时针方向为“正”,逆时针方向为“负”)。
    • 3. 发明授权
    • Liquid crystal device for gradational display
    • 液晶显示器
    • US5583682A
    • 1996-12-10
    • US253160
    • 1994-06-02
    • Hiroyuki KitayamaKenji ShinjoSyuji Yamada
    • Hiroyuki KitayamaKenji ShinjoSyuji Yamada
    • G02F1/1337C09K19/02C09K19/34G02F1/141
    • C09K19/34C09K19/0225G02F1/1416G02F2203/30
    • A liquid crystal device for gradational display, comprising: a pair of substrates each provided with an electrode, and a liquid crystal layer comprising a chiral smectic liquid crystal disposed between the substrates; the pair of substrates each having thereon alignment control layer provided with a uniaxial alignment axis, wherein aid liquid crystal layer comprises a striped region and a non-striped region where (1) the striped region and the non-striped region each assume a homogeneous alignment state, (2) the striped region extends in a direction perpendicular to the direction of the uniaxial alignment axis, and (3) each of liquid crystal molecules within the striped region and the non-striped region show bistability; and the liquid crystal molecules within the striped region have a threshold voltage, for switching between two stable states, different from that given by the liquid crystal molecules within the on-striped region. The above two regions (striped and non-striped region) having different threshold voltages each other are suitable as a display region for a liquid crystal device providing good gradation characteristic.
    • 一种用于梯度显示的液晶显示装置,包括:一对基板,每个基板均设置有电极;以及液晶层,其包括设置在所述基板之间的手性近晶液晶; 所述一对基板各自具有设置有单轴取向轴的取向控制层,其中辅助液晶层包括条纹区域和非条带区域,其中(1)所述条纹区域和所述非条纹区域各自呈均匀对准 状态,(2)条纹区域沿垂直于单轴取向轴线方向的方向延伸,(3)条纹区域和非条纹区域中的每个液晶分子显示双稳态; 并且条纹区域内的液晶分子具有阈值电压,用于在两个稳定状态之间切换,不同于在条纹区域内的液晶分子给出的稳定状态。 具有不同阈值电压的上述两个区域(条纹和非条纹区域)适合作为提供良好灰度特性的液晶装置的显示区域。