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    FAST ELECTROOPTIC SWITCHING DEVICES EMPLOYING POLYMER TEMPLATE SHAPED BY BLUE PHASE LIQUID CRYSTAL
    3.
    发明申请
    FAST ELECTROOPTIC SWITCHING DEVICES EMPLOYING POLYMER TEMPLATE SHAPED BY BLUE PHASE LIQUID CRYSTAL 审中-公开
    使用蓝相液晶形成的聚合物模板的快速电光切换装置

    公开(公告)号：US20160103351A1

    公开(公告)日：2016-04-14

    申请号：US14894688

    申请日：2014-05-30

    Applicant: KENT STATE UNIVERSITY

    Inventor： Oleg D. Lavrentovich ,  Jie Xiang

    IPC: G02F1/133 ,  G02F1/1341 ,  G02F1/1335

    CPC classification number: G02F1/13306 ,  G02F1/133528 ,  G02F1/1341 ,  G02F2001/13775 ,  G02F2001/13793 ,  G02F2203/50

    Abstract: A phase retarder includes a liquid crystal cell and electrical switching circuitry. The liquid crystal cell contains electrodes and an active layer comprising liquid crystal material stabilized by a polymer network that is shaped by a blue phase using a washout/refill procedure. The electrical switching circuitry is configured to operate the phase retarder at a switching speed of less than 500 microseconds for both rise time and decay time, and in some embodiments is configured to operate the phase retarder at a switching speed of 200 microseconds or less for both rise time and decay time. The polymer network typically has pores of less than or about 200 nm. The liquid crystal material may be a nonchiral nematic liquid crystal material, a chiral nematic liquid crystal material, or a chiral smectic liquid crystal material. In some embodiments the liquid crystal cell does not include an alignment layer.

    Abstract translation: 相位延迟器包括液晶单元和电开关电路。 液晶单元包含电极和包含由聚合物网络稳定的液晶材料的活性层，该聚合物网络使用冲洗/再填充程序由蓝相成形。 电开关电路被配置为在上升时间和衰减时间上以小于500微秒的切换速度操作相位延迟器，并且在一些实施例中被配置为以对于两者的200微秒或更小的切换速度操作相位延迟器 上升时间和衰减时间。 聚合物网络通常具有小于或约200nm的孔。 液晶材料可以是非手性向列型液晶材料，手性向列液晶材料或手性近晶液晶材料。 在一些实施例中，液晶单元不包括取向层。

    FIELD INDUCED AND CONTROLLED HELICONICAL STRUCTURE OF CHOLESTERIC LIQUID CRYSTAL
    7.
    发明申请
    FIELD INDUCED AND CONTROLLED HELICONICAL STRUCTURE OF CHOLESTERIC LIQUID CRYSTAL 有权
    液体液晶的现场诱发和控制的HELICONICAL结构

    公开(公告)号：US20160252755A1

    公开(公告)日：2016-09-01

    申请号：US15053643

    申请日：2016-02-25

    Applicant: Kent State University

    Inventor： Oleg D. Lavrentovich ,  Jie V. Xiang ,  Sergij V. Shiyanovskii ,  Corrie T. Imrie ,  Daniel A. Paterson

    IPC: G02F1/137 ,  C09K19/58 ,  C09K19/22 ,  G02F1/1343

    CPC classification number: C09K19/586 ,  C09K19/14 ,  C09K2019/0444 ,  G02F1/134363 ,  G02F1/13718

    Abstract: A liquid crystal cell includes substrates defining a gap and electrodes having one of (i) an in-plane geometry generating an electric field parallel with the substrates and (ii) a top-down geometry generating an electric field across the gap between the two spaced apart substrates. A liquid crystal material disposed in the gap between the substrates comprises a chiral nematic material formed by a mixture of: 1-(4-cyanobiphenyl-4′-yl)-6-(4-cyanobiphenyl-4′-yloxy)hexane (CB6OCB) or α,ω-bis(4,4-cyanobiphenyl)nonane (CB9CB) dimeric liquid crystal material; at least one additional dimeric liquid crystal material; and a chiral dopant. The liquid crystal material within an operational range of electric field applied by the electrodes exhibits a heliconical state with an oblique angle helicoid director whose helicoid axis is oriented parallel with the electric field and whose helicoid pitch is sized to provide diffraction or Bragg reflection of light in a spectral range of interest impinging on one of the substrates of the liquid crystal cell.

    Abstract translation: 液晶单元包括限定间隙的基板和电极，其具有以下之一：（i）产生与基板平行的电场的平面内几何形状，以及（ii）自上而下的几何形状，跨越两个间隔开的间隙产生电场 分开的基板。 设置在基板之间的间隙中的液晶材料包括由以下混合物形成的手征向列相材料：1-（4-氰基联苯-4'-基）-6-（4-氰基联苯-4'-基氧基）己烷（CB6OCB ）或α，ω-双（4,4-氰基联苯）壬烷（CB9CB）二聚液晶材料; 至少一种另外的二聚液晶材料; 和手性掺杂剂。 在由电极施加的电场的操作范围内的液晶材料呈现出具有斜角螺旋导向器的螺旋状态，其螺旋轴线与电场平行取向，并且其螺旋螺距的尺寸设置为提供光的衍射或布拉格反射 感兴趣的光谱范围在液晶单元的一个基板上。

    FIELD INDUCED HELICONICAL STRUCTURE OF CHOLESTERIC LIQUID CRYSTAL
    8.
    发明申请
    FIELD INDUCED HELICONICAL STRUCTURE OF CHOLESTERIC LIQUID CRYSTAL 有权
    球形液晶的场诱导自旋结构

    公开(公告)号：US20160033806A1

    公开(公告)日：2016-02-04

    申请号：US14812397

    申请日：2015-07-29

    Applicant: Kent State University

    Inventor： Oleg D. Lavrentovich ,  Sergij V. Shiyanovsii ,  Jie Xiang ,  Young-Ki Kim

    IPC: G02F1/137 ,  C09K19/36 ,  C09K19/58 ,  G02F1/1343

    CPC classification number: G02F1/13718 ,  C09K19/0208 ,  C09K19/586 ,  C09K2019/0444 ,  C09K2019/122 ,  C09K2019/123 ,  G02F2001/134381

    Abstract: A diffraction grating comprises a liquid crystal (LC) cell configured to apply an electric field through a cholesteric LC material that induces the cholesteric LC material into a heliconical state with an oblique helicoid director. The applied electric field produces diffracted light from the cholesteric LC material within the visible, infrared or ultraviolet. The axis of the heliconical state is in the plane of the liquid crystal cell or perpendicular to the plane, depending on the application. A color tuning device operates with a similar heliconical state liquid crystal material but with the heliconical director axis oriented perpendicular to the plane of the cell. A power generator varies the strength of the applied electric field to adjust the wavelength of light reflected from the cholesteric liquid crystal material within the visible, infrared or ultraviolet.

    Abstract translation: 衍射光栅包括液晶（LC）单元，其被配置为通过胆甾醇型LC材料施加电场，所述胆甾型液晶材料通过倾斜螺旋导向器将胆甾型液晶材料诱导成螺旋状态。 所施加的电场在可见光，红外或紫外线内产生胆甾醇型LC材料的衍射光。 根据应用，螺旋状态的轴在液晶单元的平面内或垂直于平面。 颜色调整装置用类似的螺旋状液晶材料操作，但是与垂直于电池平面的螺旋导向器轴定向。 发电机改变施加电场的强度，以调节在可见光，红外线或紫外线内从胆甾型液晶材料反射的光的波长。

    Photopatterning of molecular orientations
    9.
    发明授权
    Photopatterning of molecular orientations 有权

    公开(公告)号：US11586075B2

    公开(公告)日：2023-02-21

    申请号：US16484218

    申请日：2018-02-07

    Applicant: Kent State University

    Inventor： Qi-Huo Wei ,  Hao Yu ,  Yubing Guo ,  Miao Jiang ,  Oleg D. Lavrentovich

    IPC: G02F1/1337 ,  B82Y20/00 ,  B82Y40/00 ,  C09K19/56 ,  G02F1/1523

    Abstract: A method for aligning molecular orientations of liquid crystals and/or polymeric materials into spatially variant patterns uses metamasks. When non-polarized or circularly polarized light is transmitted through or reflected by the metamasks, spatially varied polarization direction and intensity patterns of light can be generated. By projecting the optical patterns of the metamasks onto substrates coated with photoalignment materials, spatially variant molecular orientations encoded in the polarization and intensity patterns are induced in the photoalignment materials, and transfer into the liquid crystals. Possible designs for the metamask use nanostructures of metallic materials (e.g., rectangular nanocuboids of metallic materials arrayed on a transparent substrate).

    Liquid crystals with patterned molecular orientation as an electrolytic active medium
    10.
    发明授权
    Liquid crystals with patterned molecular orientation as an electrolytic active medium 有权

    公开(公告)号：US10350597B2

    公开(公告)日：2019-07-16

    申请号：US15358532

    申请日：2016-11-22

    Applicant: Kent State University

    Inventor： Oleg D. Lavrentovich ,  Qi-Huo Wei ,  Sergij V. Shiyanovskii ,  Chenhui Peng ,  Yubing Guo

    IPC: G01N27/447 ,  G01N27/453 ,  B01L3/00 ,  B01F13/00

    Abstract: A transport device comprises: a fluid cell comprising parallel substrates; an anisotropic electrolyte disposed in the fluid cell; and electrodes configured to apply an AC electric field to the anisotropic electrolyte disposed in the fluid cell. A substrate of the fluid cell includes a pattern that induces a director distortion pattern in the anisotropic electrolyte disposed in the fluid cell. The director distortion pattern has a gradient configured to induce electrokinetic flow of the anisotropic electrolyte in the fluid cell in response to the AC electric field applied by the electrodes. Cargo, such as particles, gas bubbles, or fluid, is dispersed in the anisotropic electrolyte and transported in the fluid cell by the induced electrokinetic flow of the anisotropic electrolyte. The induced electrokinetic flow may be linear, curvilinear, circular so as to induce mixing, depending on the predesigned director pattern. The director pattern might be nonsingular (defect free) or may contain defects such as disclinations that produce pumping effects and can trap cargo at a core of the disclination.

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