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83 条记录 (耗时 0.021 秒)

    OPTICAL SHEET, BACKLIGHT UNIT, LIQUID CRYSTAL DISPLAY APPARATUS, AND INFORMATION DEVICE
    1.
    发明申请
    OPTICAL SHEET, BACKLIGHT UNIT, LIQUID CRYSTAL DISPLAY APPARATUS, AND INFORMATION DEVICE 有权

    公开(公告)号：US20230052606A1

    公开(公告)日：2023-02-16

    申请号：US17978632

    申请日：2022-11-01

    申请人： KEIWA Inc.

    发明人： Kenta SASA

    IPC分类号： G02F1/13357 ,  G02F1/1335

    摘要： An optical sheet 5 is an optical sheet, at least a first surface of the optical sheet has unevenness. A sparkle contrast of the first surface measured in conformity with JIS C 1006: 2019 is 4% or less. An arithmetic average roughness Ra of the first surface measured in conformity with JIS B 0601: 2001 (with an assessment length set to 290 µm) may be 0.6 µm or less. A peak count RPc of the first surface measured in conformity with JIS B 0601: 2001 (with an assessment length set to 290 µm) may be 16 or more.

    BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE
    2.
    发明申请
    BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE 有权

    公开(公告)号：US20210003767A1

    公开(公告)日：2021-01-07

    申请号：US16957277

    申请日：2018-11-08

    申请人： KEIWA Inc.

    发明人： Yoshitada NAMIKAWA ,  Yuki MATSUNO

    IPC分类号： F21V8/00 ,  G02F1/1335

    摘要： A backlight unit (5) includes a light guide sheet (21) and a light diffusion sheet (23) provided on the surface of the light guide sheet (21). Assuming that the coefficient of static friction between the light guide sheet (21) and the light diffusion sheet (23) measured at a temperature of 23° C. and a humidity of 50% in accordance with JIS K 7125 is Y1, and the difference in coefficient of linear expansion between the light guide sheet (21) and the light diffusion sheet (23) measured in accordance with JIS K 7197 is X, the following relational expression (1) is satisfied. [Math. 1] Y1≤1.00×10−4X2−3.43×10−2X+2.35  (1).

    OPTICAL SHEET FOR LIQUID CRYSTAL DISPLAY DEVICE, AND BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY
    6.
    发明申请
    OPTICAL SHEET FOR LIQUID CRYSTAL DISPLAY DEVICE, AND BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY 审中-公开

    公开(公告)号：US20180180794A1

    公开(公告)日：2018-06-28

    申请号：US15856224

    申请日：2017-12-28

    申请人： KEIWA INC.

    发明人： Kenichi Harada ,  Yoshitada Namikawa ,  Tadayoshi Fukuda ,  Yuki Matsuno

    IPC分类号： F21V8/00

    摘要： An optical sheet for a liquid crystal display device has functions of condensing rays of light with respect to a specific direction in a plane of the optical sheet, and diffusing rays of light with respect to a direction perpendicular to the specific direction. A backlight unit for a liquid crystal display device includes: a light guide film for guiding rays of light incident on an end face of the light guide film toward a front face side; at least one LED light source disposed along the end face of the light guide film; the optical sheet disposed on the front face side; and a prism sheet disposed on a front face of the optical sheet, with the specific direction being parallel to a direction of rays of light emitted by the at least one LED light source and perpendicular to a direction of prism rows of the prism sheet.

    Optical waveguide sheet, backlight unit, and portable terminal
    7.
    发明授权
    Optical waveguide sheet, backlight unit, and portable terminal 有权

    公开(公告)号：US09977171B2

    公开(公告)日：2018-05-22

    申请号：US14626239

    申请日：2015-02-19

    申请人： KEIWA INC.

    发明人： Hironori Nakashima ,  Kenichi Harada

    IPC分类号： F21V7/04 ,  F21V8/00

    CPC分类号： G02B6/0036 ,  G02B6/0043 ,  G02B6/0055 ,  G02B6/0058 ,  G02B6/0088

    摘要： An optical waveguide sheet for use in an edge-lit backlight unit is provided, that allows rays of light to enter the end face and emits the rays of light from the front face substantially uniformly. The optical waveguide sheet includes, on the back side thereof: a plurality of recessed portions falling toward the front face side; and a plurality of raised portions each provided around each of the plurality of recessed portions and projecting toward the back face side. The optical waveguide sheet preferably has an average thickness of no less than 100 μm and no greater than 600 μm, and is preferably used as a light guide film. The optical waveguide sheet preferably has an average thickness of no less than 100 μm and no greater than 600 μm, and is preferably used as a light guide film.

    PRISM SHEET FOR BACKLIGHT UNIT AND BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY DEVICE
    8.
    发明申请
    PRISM SHEET FOR BACKLIGHT UNIT AND BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY DEVICE 审中-公开

    公开(公告)号：US20170357047A1

    公开(公告)日：2017-12-14

    申请号：US15622550

    申请日：2017-06-14

    申请人： KEIWA INC.

    发明人： Kenichi HARADA ,  Yoshitada NAMIKAWA ,  Tadayoshi FUKUDA ,  Yuki MATSUNO

    IPC分类号： F21V8/00

    CPC分类号： G02B6/0053 ,  G02B6/0051

    摘要： Provided is a prism sheet for a backlight unit capable of attaining desired luminance in the front direction, and securing a sufficient viewing angle in the direction perpendicular to the orientation direction of the prism array. The prism sheet comprises one or more resin layers, an outermost resin layer of the one or more resin layers comprising a prism array, wherein on a surface of at least one of the one or more resin layers, micro linear grooves are formed to be parallel to, or to intersect at an acute angle with, an orientation direction of the prism array. An average number of existing micro linear grooves per unit length in a direction perpendicular to an average orientation direction of the micro linear grooves is preferably no less than 30/mm and no greater than 10,000/mm. The micro linear grooves are preferably irregular in length, width or pitch.

    SUBSTRATE FILM FOR OPTICLA SHEET, OPTICAL SHEET AND BACKLIGHT UNIT
    10.
    发明申请
    SUBSTRATE FILM FOR OPTICLA SHEET, OPTICAL SHEET AND BACKLIGHT UNIT 审中-公开
    OPTICLA板，光学片和背光单元的基片

    公开(公告)号：US20170052308A1

    公开(公告)日：2017-02-23

    申请号：US15296833

    申请日：2016-10-18

    申请人： KEIWA INC.

    发明人： Kenichi HARADA

    IPC分类号： F21V8/00 ,  G02F1/1335 ,  G02B5/02

    CPC分类号： G02B6/0056 ,  G02B5/0226 ,  G02B5/0257 ,  G02B5/0268 ,  G02B6/0051 ,  G02B6/0053 ,  G02B6/0065 ,  G02F1/133536 ,  G02F1/13362 ,  G02F1/13363 ,  G02F2001/133607 ,  G02F2202/40

    摘要： An object of the present invention is to provide a substrate film for an optical sheet, an optical sheet and a backlight unit capable of markedly enhancing utilization efficiency of rays of light and improving luminance. The present invention is characterized by being a substrate film for an optical sheet which is a made of a transparent resin and which is formed into a rectangular shape, which substrate film for the optical sheet having an optical anisotropy, and having an absolute value of the angle of the crystal orientation with respect to the short side orientation being π/16 or greater and 3π/16 or less. The crystal orientation preferably follows the phase advancing axial orientation. The substrate film for the optical sheet has a retardation value such that average intensity of transmitted beam IA becomes equal to or greater than 0.75 so as to be capable of converting polarization orientation of outgoing rays of light of the optical waveguide plate or the like to the transmission axial orientation of the polarizing plate or the like. The retardation value is preferably 140 nm or greater and 390 nm or less. The transparent resin is preferably polyethylene terephthalate or polycarbonate. The optical sheet of the present invention has the substrate film for the optical sheet, and an optical layer.

    摘要翻译： 本发明的目的是提供一种能够显着提高光线的利用效率和提高亮度的用于光学片，光学片和背光单元的基片。 本发明的特征在于，作为由透明树脂制成并形成为矩形形状的光学片用基片，该光学片的基片膜具有光学各向异性，绝对值为 相对于短边方向的晶体取向的角度为π/ 16以上且3π/ 16以下。 晶体取向优选地沿相位推进轴向取向。 用于光学片的衬底膜具有延迟值，使得透射光束1A的平均强度变为等于或大于0.75，以便能够将光波导板等的出射光的偏振取向转换为 偏振板等的透射轴向取向。 延迟值优选为140nm以上且390nm以下。 透明树脂优选为聚对苯二甲酸乙二醇酯或聚碳酸酯。 本发明的光学片具有用于光学片的基片膜和光学层。