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    Optical element and display device
    4.
    发明授权
    Optical element and display device 有权

    公开(公告)号：US11988918B1

    公开(公告)日：2024-05-21

    申请号：US18382267

    申请日：2023-10-20

    Applicant: Sharp Display Technology Corporation

    Inventor： Yuichi Kawahira ,  Masahiro Hasegawa ,  Ryosuke Saigusa ,  Jianeng Xu ,  Akira Sakai

    IPC: G02F1/1335 ,  G02F1/13357

    CPC classification number: G02F1/133531 ,  G02F1/133605 ,  G02F1/133607 ,  G02F2202/40

    Abstract: Provided is an optical element including a phase difference layer. The phase difference layer is a laminate of n first phase difference layers and m second phase difference layers. The n first phase difference layers each contain first anisotropic molecules with tilt angles different between a viewing surface side and a back surface side. The m second phase difference layers each contain second anisotropic molecules with tilt angles different between a viewing surface side and a back surface side. Slow axes of the n first phase difference layers are in a same orientation. Slow axes of the m second phase difference layers are in a same orientation. The slow axes of the n first phase difference layers and the slow axes of the m second phase difference layers are anti-parallel to each other and are parallel to or perpendicular to the transmission axis of the first polarizer.

    Optical element and display device
    6.
    发明授权
    Optical element and display device 有权

    公开(公告)号：US12174483B2

    公开(公告)日：2024-12-24

    申请号：US18380870

    申请日：2023-10-17

    Applicant: Sharp Display Technology Corporation

    Inventor： Yuichi Kawahira ,  Masahiro Hasegawa ,  Ryosuke Saigusa ,  Jianeng Xu ,  Akira Sakai

    IPC: G02F1/1335 ,  G02B5/30 ,  G02F1/13363 ,  G02F1/1337

    Abstract: Provided is an optical element including, sequentially from a viewing surface side toward a back surface side: a first polarizer; a negative C plate; a phase difference layer; and a second polarizer. A transmission axis of the first polarizer is parallel to a transmission axis of the second polarizer. The phase difference layer contains anisotropic molecules. In the phase difference layer, a tilt angle of the anisotropic molecules on a viewing surface side in the phase difference layer and a tilt angle of the anisotropic molecules on a back surface side in the phase difference layer are the same as each other and greater than 0°. A slow axis of the phase difference layer, in a case of lying in a tilt direction of the anisotropic molecules, is parallel to or perpendicular to the transmission axis of the first polarizer.

    Optical element and liquid crystal display device
    7.
    发明授权
    Optical element and liquid crystal display device 有权

    公开(公告)号：US11874549B2

    公开(公告)日：2024-01-16

    申请号：US18199882

    申请日：2023-05-19

    Applicant: Sharp Display Technology Corporation

    Inventor： Ryosuke Saigusa ,  Akira Sakai ,  Yuichi Kawahira ,  Masahiro Hasegawa

    IPC: G02F1/1335 ,  G02F1/13363

    CPC classification number: G02F1/133528 ,  G02F1/13363 ,  G02F1/133562 ,  G02F1/133567 ,  G02F2413/02 ,  G02F2413/06

    Abstract: Provided are an optical element that can achieve both color difference control and luminance reduction at an oblique viewing angle, and a liquid crystal display device including the optical element and having excellent display quality. The optical element includes: a first polarizer; a first phase difference layer; a second phase difference layer; and a second polarizer, the first polarizer, the first phase difference layer, the second phase difference layer, and the second polarizer being arranged in the stated order, the first phase difference layer satisfying the formula nx>ny≈nz, the second phase difference layer satisfying the formula nz>nx≈ny, the first polarizer and the second polarizer being linear polarizers, transmission axes of the first polarizer and the second polarizer being parallel to each other, a slow axis of the first phase difference layer being orthogonal to a polarization axis of the first polarizer.

    Optical element and liquid crystal display device including the same
    8.
    发明授权
    Optical element and liquid crystal display device including the same 有权

    公开(公告)号：US11934069B2

    公开(公告)日：2024-03-19

    申请号：US17893313

    申请日：2022-08-23

    Applicant: Sharp Display Technology Corporation

    Inventor： Akira Sakai ,  Yuichi Kawahira ,  Masahiro Hasegawa ,  Ryosuke Saigusa

    IPC: G02F1/13363 ,  G02F1/1335

    CPC classification number: G02F1/13363 ,  G02F1/133531 ,  G02F1/133536

    Abstract: An optical element includes, sequentially from a viewing surface side toward a back surface side: a viewing-surface-side polarizer; a retarder; and a back-surface-side polarizer, a transmission axis of the viewing-surface-side polarizer and a transmission axis of the back-surface-side polarizer being parallel to each other, the optical element having an average angle θ between an angle θ1 and an angle θ2 of greater than 0° and smaller than 90°, wherein the angle θ1 represents an angle formed by an optical axis of the retarder on a surface close to the back surface with the surface close to the back surface; and the angle θ2 represents an angle formed by an optical axis of the retarder on a surface close to the viewing surface with the surface close to the viewing surface.

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