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    • 6. 发明申请
    • Smectic A Compositions For Use in Optical Devices
    • 用于光学器件的平面组件
    • US20130342773A1
    • 2013-12-26
    • US13978805
    • 2012-01-09
    • Daping ChuHuan XuWilliam Alden CrosslandAnthony Bernard Davey
    • Daping ChuHuan XuWilliam Alden CrosslandAnthony Bernard Davey
    • C09K19/58G02F1/1333
    • G02F1/1333C09K19/02C09K19/408C09K19/52C09K19/582
    • A liquid crystal smectic A composition that can be switched by the application of different electric fields across it between a first stable state (left hand block in FIG. 4) and at least one second stable state (right hand block in FIG. 4) in which the composition is less ordered than in the first state. The radiation transmission properties of the first and second states are different. The composition comprises: (A) a liquid crystal material that has a positive dielectric anisotropy and that is a uniformly aligned smectic A structure when in the first state; (B) an ionic dopant giving a negative conductivity anisotropy in the liquid crystal material so that it is capable of disrupting the smectic A structure of the first state when subject to an electric field that causes the dopant to migrate through the composition, thereby causing the composition to switch into said at least one second state, and (C) optically anisotropic pigment particles having positive dielectric anisotropy dispersed in the composition, the largest dimension of the pigment particles being in the range of 10 nm to 1 μm. The composition, when in the first relatively stable state, is capable of undergoing smectic dynamic scattering due to electro-hydrodynamic instability under the influence of a sufficiently low frequency AC field, thereby disordering the liquid crystals and the pigment particles and thereby discouraging the pigment particles from aggregating together. The composition is suitable for use in displays and is especially resistant to degradation by ambient light and so can be used in outside applications.
    • 液晶近晶A组合物,其可以通过在第一稳定状态(图4中的左侧块)和至少一个第二稳定状态(图4中的右侧块)之间施加不同的电场来切换 其组成不如第一状态那么有序。 第一和第二状态的辐射传播特性不同。 该组合物包含:(A)具有正介电各向异性且当处于第一状态时为均匀取向的近晶A结构的液晶材料; (B)在液晶材料中具有负电导率各向异性的离子掺杂剂,使得当受到使掺杂剂迁移通过组合物的电场时能够破坏第一状态的近晶A结构,从而导致 组成切换到所述至少一个第二状态,和(C)具有分散在组合物中的正介电各向异性的光学各向异性颜料颗粒,颜料颗粒的最大尺寸在10nm至1μm的范围内。 当处于第一相对稳定状态时,由于在足够低频率的AC场的影响下由于电流动力学不稳定性,组合物能够发生近晶的动态散射,从而使液晶和颜料颗粒失调,从而阻止颜料颗粒 从聚合在一起。 该组合物适用于显示器,并且特别耐环境光降解,因此可用于外部应用。