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    Optical film, polarizing plate, image display device, and optical film selection method
    1.
    发明授权
    Optical film, polarizing plate, image display device, and optical film selection method 有权

    公开(公告)号：US12216302B2

    公开(公告)日：2025-02-04

    申请号：US17764456

    申请日：2020-09-30

    Applicant: DAI NIPPON PRINTING CO., LTD.

    Inventor： Shosei Kubota ,  Yoshiko Tanaka ,  Norio Ishii ,  Takashi Kuroda ,  Hiroaki Segawa ,  Akinobu Ushiyama

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

    Abstract: Provided is an optical film that can suppress rainbow unevenness when viewed with the naked eyes without increasing the in-plane phase difference. The optical film has a low-refractive index layer on a plastic film, the plastic film is a biaxially stretched plastic film with an in-plane phase difference of 2500 nm or less, the low-refractive index layer is located on the outermost surface, and the optical film has a region in which ΔEab satisfies specific conditions, wherein the ΔEab is calculated from the differences between the L* value, the a* value, and the b* value obtained by measuring a laminate 1 including the optical film, the polarizer, and the surface light source under specific conditions and the L* value, the a* value, and the b* value obtained by measuring a laminate 2 including the polarizer and the surface light source under specific conditions, respectively.

    Electromagnetic wave reflecting member
    3.
    发明授权
    Electromagnetic wave reflecting member 有权

    公开(公告)号：US10890777B2

    公开(公告)日：2021-01-12

    申请号：US16108554

    申请日：2018-08-22

    Applicant: Dai Nippon Printing Co., Ltd.

    Inventor： Takashi Kuroda ,  Satoru Hamada ,  Keiji Kashima

    IPC: G02B5/30 ,  G02B27/28 ,  G02B5/26 ,  G02B5/28

    Abstract: Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ, provided in that order, the phase difference layer having a retardation satisfying the following equation: Re={(2n+1)/2±0.2}×λ wherein Re represents average retardation; λ represents wavelength; and n is an integer of 1 or more.

    BACKLIGHT UNIT, LIQUID-CRYSTAL DISPLAY APPARATUS, AND STACKED STRUCTURE
    7.
    发明申请
    BACKLIGHT UNIT, LIQUID-CRYSTAL DISPLAY APPARATUS, AND STACKED STRUCTURE 有权
    背光单元，液晶显示装置和堆叠结构

    公开(公告)号：US20150260903A1

    公开(公告)日：2015-09-17

    申请号：US14643271

    申请日：2015-03-10

    Applicant: Dai Nippon Printing Co., Ltd.

    Inventor： Keiji Kashima ,  Yasuki Suzuura ,  Hiroshi Yamamoto ,  Takashi Kuroda

    IPC: F21V8/00 ,  G02B5/04 ,  G02F1/1335 ,  G02B5/30 ,  G02F1/13363 ,  G02F1/1337

    CPC classification number: G02B6/0056 ,  G02B6/0053 ,  G02B6/0055

    Abstract: Sufficiently sharp directivity can be secured with a simple configuration in a configuration that improves the efficiency of utilizing the light exiting from a primary light source using a reflective polarizing plate. A backlight unit (2) supplies light exiting from an exit surface of a light guide plate (12) to a liquid-crystal display panel (3) via a reflective polarizing plate (16) after correcting directivity of the exiting light using a prism sheet (14) having a downwardly convex shape. A ¼-wavelength plate (15) is provided between the prism sheet (14) and the reflective polarizing plate (16), between the prism sheet (14) and the light guide plate, or between the light guide plate and a reflective sheet disposed on a surface of the light guide plate opposite to the prism sheet (14).

    Abstract translation: 可以以简单的结构确保足够尖锐的方向性，从而提高使用反射偏振片从初级光源出射的光的效率。 背光单元（2）在使用棱镜片校正出射光的方向性之后，经由反射偏振板（16）将从导光板（12）的出射表面射出的光提供给液晶显示面板（3） （14）具有向下凸的形状。 在棱镜片（14）和反射偏光板（16）之间，在棱镜片（14）和导光板之间，或者在导光板和设置的反射片之间设置有1/4波片（15） 在所述导光板的与所述棱镜片（14）相反的表面上。

    Image display device
    9.
    发明授权
    Image display device 有权

    公开(公告)号：US11204524B2

    公开(公告)日：2021-12-21

    申请号：US16068044

    申请日：2017-01-05

    Applicant: Dai Nippon Printing Co., Ltd.

    Inventor： Yasuhiro Koike ,  Takashi Kuroda ,  Kana Yamamoto

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

    Abstract: The present invention aims to provide an image display device including an optical film having a thickness suitable for practical use without including any special inorganic material, wherein the image display device has high color rendering properties and is capable of minimizing the occurrence of blackout and interference colors (rainbow unevenness) even when the image display device includes light sources that emit light having a narrow emission spectrum. The present invention provides an image display device including an optical film having an in-plane birefringence and a polarizer in this order, wherein the optical film and the polarizer are disposed to form an angle of about 45° between a slow axis of the optical film and an absorption axis of the polarizer, the optical film has a retardation of 3000 nm or more, and light incident on the optical film provides at least 50% coverage of ITU-R BT.2020.

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