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    SWITCHABLE LIQUID CRYSTAL FRESNEL LENS
    7.
    发明申请
    SWITCHABLE LIQUID CRYSTAL FRESNEL LENS 有权
    可切换液晶玻璃镜片

    公开(公告)号：US20150036084A1

    公开(公告)日：2015-02-05

    申请号：US14452190

    申请日：2014-08-05

    Applicant: The Hong Kong University of Science and Technology

    Inventor： Abhishek Kumar Srivastava ,  Xiaoqian Wang ,  Vladimir Grigorievich Chigrinov ,  Hoi-Sing Kwok

    IPC: G02F1/1335 ,  G02F1/1337

    CPC classification number: G02F1/29 ,  G02F1/133528 ,  G02F1/1337 ,  G02F1/133753 ,  G02F1/133788 ,  G02F1/141 ,  G02F2001/1414 ,  G02F2001/294

    Abstract: A liquid crystal Fresnel lens is provided. The liquid crystal Fresnel lens includes a liquid crystal cell and two polarizers. The liquid crystal cell includes: two transparent substrates having conducting layers disposed thereon with alignment layers, wherein an alignment pattern formed by the alignment layers are configured to provide multiple alignment domains in a Fresnel zones pattern, and wherein an easy axis of adjacent alignment domains are oriented at an angle relative to one another; and a ferroelectric liquid crystal layer disposed between the two transparent substrates, wherein the ferroelectric liquid crystal layer has a planar surface orientation and smectic layers perpendicular to the two transparent substrates. The liquid crystal cell is disposed between the two polarizers.

    Abstract translation: 提供了一种液晶菲涅尔透镜。 液晶菲涅尔透镜包括液晶单元和两个偏振器。 液晶单元包括：两个透明基板，其上设置有配向层的导电层，其中由对准层形成的取向图案被配置成以菲涅尔区域图案提供多个取向区域，并且其中相邻对准域的容易轴为 相对于彼此成一角度定向; 以及设置在两个透明基板之间的铁电液晶层，其中铁电液晶层具有平面表面取向和垂直于两个透明基板的近晶层。 液晶单元配置在两个偏振器之间。

    Electrically switchable liquid crystal grating cell based on photoalignment with an amplitude mask
    8.
    发明授权
    Electrically switchable liquid crystal grating cell based on photoalignment with an amplitude mask 有权

    公开(公告)号：US12276884B1

    公开(公告)日：2025-04-15

    申请号：US18498148

    申请日：2023-10-31

    Applicant: The Hong Kong University of Science and Technology

    Inventor： Yuechu Cheng ,  Abhishek Kumar Srivastava

    IPC: G02F1/1347 ,  G02F1/1337 ,  G02F1/135

    Abstract: A switchable liquid crystal grating cell, and methods for manufacturing the above. The switchable liquid crystal grating cell comprises a pair of switchable liquid crystal grating parts, each switchable liquid crystal grating part comprises a substrate; a conductive layer on the substrate; and a photoalignment layer with an alignment pattern above the conductive layer on the substrate, the alignment pattern having first and second types of domains, the first type of domain having a first uniform alignment direction, the second type of domain having a second uniform alignment direction that is reoriented at a predetermined angle to the first uniform alignment direction, the predetermined angle is 85°-95°, and a liquid crystal layer sandwiched between the pair of switchable liquid crystal grating parts, wherein an alignment pattern on a top surface is arranged to be shifted relative to the other alignment pattern on a bottom surface.

    High-contrast ferroelectric liquid crystal cell
    9.
    发明授权
    High-contrast ferroelectric liquid crystal cell 有权

    公开(公告)号：US12019345B2

    公开(公告)日：2024-06-25

    申请号：US18004571

    申请日：2021-09-10

    Applicant: The Hong Kong University of Science and Technology

    Inventor： Zhibo Sun ,  Zhengnan Yuan ,  Abhishek Kumar Srivastava ,  Hoi-Sing Kwok

    IPC: G02F1/1335 ,  G02F1/13363 ,  G02F1/141

    CPC classification number: G02F1/141 ,  G02F1/133541 ,  G02F1/133638

    Abstract: One or more devices, systems, methods and/or apparatus to facilitate suppression of fringe field effect, such as for diffraction grating and/or display purposes. In one embodiment, a ferroelectric liquid crystal (FLC) element can comprise a pair of conductive substrates, a FLC layer having a helical pitch and positioned between the conductive substrates, one or more spacers fixedly positioned between the conductive substrates, and an alignment layer positioned between the FLC layer and one of the conductive substrates. The alignment layer can be disposed at least partially contiguous with the FLC layer. The FLC layer can comprise a chiral smectic C* liquid crystal layer having at least one of a helical pitch smaller than an average cell gap of the FLC layer, or an average helical pitch of the FLC layer being smaller than an average thickness of the FLC layer between the conductive substrates.

    HIGH-CONTRAST FERROELECTRIC LIQUID CRYSTAL CELL
    10.
    发明公开
    HIGH-CONTRAST FERROELECTRIC LIQUID CRYSTAL CELL 审中-公开

    公开(公告)号：US20230244102A1

    公开(公告)日：2023-08-03

    申请号：US18004571

    申请日：2021-09-10

    Applicant: The Hong Kong University of Science and Technology

    Inventor： Zhibo Sun ,  Zhengnan Yuan ,  Abhishek Kumar Srivastava ,  Hoi-Sing Kwok

    IPC: G02F1/1335 ,  G02F1/141 ,  G02F1/13363

    CPC classification number: G02F1/133541 ,  G02F1/141 ,  G02F1/133638

    Abstract: One or more devices, systems, methods and/or apparatus to facilitate suppression of fringe field effect, such as for diffraction grating and/or display purposes. In one embodiment, a ferroelectric liquid crystal (FLC) element can comprise a pair of conductive substrates, a FLC layer having a helical pitch and positioned between the conductive substrates, one or more spacers fixedly positioned between the conductive substrates, and an alignment layer positioned between the FLC layer and one of the conductive substrates. The alignment layer can be disposed at least partially contiguous with the FLC layer. The FLC layer can comprise a chiral smectic C* liquid crystal layer having at least one of a helical pitch smaller than an average cell gap of the FLC layer, or an average helical pitch of the FLC layer being smaller than an average thickness of the FLC layer between the conductive substrates.

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