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    High-contrast ferroelectric liquid crystal cell
    2.
    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
    3.
    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.

    Projection device and fabrication method of a polarization grating
    4.
    发明授权
    Projection device and fabrication method of a polarization grating 有权

    公开(公告)号：US09743054B2

    公开(公告)日：2017-08-22

    申请号：US14205382

    申请日：2014-03-12

    Applicant: The Hong Kong University of Science and Technology ,  Himax Display, Inc.

    Inventor： Hoi-Sing Kwok ,  Li Tan ,  Yuet-Wing Li

    IPC: G02F1/1335 ,  H04N9/31

    CPC classification number: H04N9/3167 ,  G02F1/13378 ,  G02F1/133788 ,  H04N9/3164

    Abstract: A projection device including a light source, a reflective spatial polarization modulator, a polarization grating, and a projection lens is provided. The light source is configured to provide a light beam. The reflective spatial polarization modulator is disposed on a path of the light beam and configured to reflect the light beam and modulate a polarization state of the light beam. The polarization grating is disposed on the path of the light beam between the light source and the reflective spatial polarization modulator, wherein the reflective spatial polarization modulator reflects the light beam from the reflective spatial polarization modulator back to the polarization grating. The projection lens is disposed on the path of the light beam from the reflective spatial polarization modulator, wherein the polarization grating is disposed on the path of the light beam between the reflective spatial polarization modulator and the projection lens.

    2D/3D switchable liquid crystal lens unit
    6.
    发明授权
    2D/3D switchable liquid crystal lens unit 有权

    公开(公告)号：US10281731B2

    公开(公告)日：2019-05-07

    申请号：US14713238

    申请日：2015-05-15

    Applicant: The Hong Kong University of Science and Technology

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

    IPC: G02F1/141 ,  G02F1/1335 ,  G02F1/1333 ,  G02B27/22 ,  G02B27/26 ,  G02F1/133 ,  G02F1/13363 ,  G02F1/29 ,  H04N13/04 ,  G02F1/1334

    Abstract: A 2D/3D switchable liquid crystal lens device includes: a polarization-dependent lens array, configured to provide a focusing effect for impinging light having a first plane of polarization of the impinging light and to provide no focusing effect for impinging light have a second plane of polarization orthogonal to the first plane of polarization; a switchable polarization rotating stage, comprising bi-stable liquid crystals, wherein the switchable polarization rotating stage is configured to output light having the first plane of polarization to the polarization-dependent lens array while the bi-stable liquid crystals are in a first state, and to output light having the second plane of polarization to the polarization-dependent lens array while the bi-stable liquid crystals are in a second state; and a driving system, configured to switch the bi-stable liquid crystals of the switchable polarization rotating stage between the first state and the second state.

    2D/3D Switchable Liquid Crystal Lens Unit
    8.
    发明申请
    2D/3D Switchable Liquid Crystal Lens Unit 审中-公开
    2D / 3D可切换液晶镜头单元

    公开(公告)号：US20150331247A1

    公开(公告)日：2015-11-19

    申请号：US14713238

    申请日：2015-05-15

    Applicant: The Hong Kong University of Science and Technology

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

    IPC: G02B27/22 ,  G02F1/1347 ,  G02F1/13363 ,  G02F1/133 ,  G02F1/1333 ,  G02F1/1334 ,  G02B27/26 ,  G02F1/135

    CPC classification number: G02B27/2214 ,  G02B27/26 ,  G02F1/13306 ,  G02F1/133365 ,  G02F1/1334 ,  G02F1/13363 ,  G02F1/29 ,  G02F2001/13345 ,  G02F2001/294 ,  H04N13/305 ,  H04N13/356

    Abstract: A 2D/3D switchable liquid crystal lens device includes: a polarization-dependent lens array, configured to provide a focusing effect for impinging light having a first plane of polarization of the impinging light and to provide no focusing effect for impinging light have a second plane of polarization orthogonal to the first plane of polarization; a switchable polarization rotating stage, comprising bi-stable liquid crystals, wherein the switchable polarization rotating stage is configured to output light having the first plane of polarization to the polarization-dependent lens array while the bi-stable liquid crystals are in a first state, and to output light having the second plane of polarization to the polarization-dependent lens array while the bi-stable liquid crystals are in a second state; and a driving system, configured to switch the bi-stable liquid crystals of the switchable polarization rotating stage between the first state and the second state.

    Abstract translation: 2D / 3D可切换液晶透镜装置包括：偏振相关透镜阵列，被配置为提供聚焦效果，用于入射具有入射光的第一偏振面的光并且不提供用于入射光的聚焦效果具有第二平面 与第一偏振平面正交的偏振光; 包括双稳态液晶的可切换偏振旋转台，其中所述可切换偏振旋转台被配置为在所述双稳态液晶处于第一状态时将具有所述第一偏振平面的光输出到所述偏振相关透镜阵列， 并且当双稳态液晶处于第二状态时，将具有第二偏振面的光输出到偏振相关透镜阵列; 以及驱动系统，被配置为在所述第一状态和所述第二状态之间切换所述可切换偏振旋转台的双稳态液晶。

    PROJECTION DEVICE AND FABRICATION METHOD OF A POLARIZATION GRATING
    10.
    发明申请
    PROJECTION DEVICE AND FABRICATION METHOD OF A POLARIZATION GRATING 有权
    投影设备和偏振光栅的制造方法

    公开(公告)号：US20150264327A1

    公开(公告)日：2015-09-17

    申请号：US14205382

    申请日：2014-03-12

    Applicant: Himax Display, Inc. ,  The Hong Kong University of Science and Technology

    Inventor： Hoi-Sing Kwok ,  Li Tan ,  Yuet-Wing Li

    IPC: H04N9/31 ,  H04N5/74

    CPC classification number: H04N9/3167 ,  G02F1/13378 ,  G02F1/133788 ,  H04N9/3164

    Abstract: A projection device including a light source, a reflective spatial polarization modulator, a polarization grating, and a projection lens is provided. The light source is configured to provide a light beam. The reflective spatial polarization modulator is disposed on a path of the light beam and configured to reflect the light beam and modulate a polarization state of the light beam. The polarization grating is disposed on the path of the light beam between the light source and the reflective spatial polarization modulator, wherein the reflective spatial polarization modulator reflects the light beam from the reflective spatial polarization modulator back to the polarization grating. The projection lens is disposed on the path of the light beam from the reflective spatial polarization modulator, wherein the polarization grating is disposed on the path of the light beam between the reflective spatial polarization modulator and the projection lens.

    Abstract translation: 提供了包括光源，反射空间偏振调制器，偏振光栅和投影透镜的投影装置。 光源被配置成提供光束。 反射空间偏振调制器设置在光束的路径上并且被配置为反射光束并且调制光束的偏振状态。 偏振光栅设置在光源和反射空间偏振调制器之间的光束路径上，其中反射空间偏振调制器将来自反射空间极化调制器的光束反射回偏振光栅。 投影透镜设置在来自反射空间偏振调制器的光束的路径上，其中偏振光栅设置在反射空间偏振调制器和投影透镜之间的光束的路径上。

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