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公开(公告)号：US09823390B2
公开(公告)日：2017-11-21
申请号：US14794075
申请日：2015-07-08
申请人： KEIWA INC.
发明人： Yoshitada Namikawa
CPC分类号： G02B1/16 , G02B5/0226 , G02B6/0031 , G02B6/0036 , G02B6/0051 , G02B6/0073 , G02B6/0088
摘要： An optical sheet includes: a transparent substrate sheet; and a sticking preventive portion provided on the back face of the transparent substrate sheet. The sticking preventive portion includes a plurality of printed dots. The average diameter of the printed dots is preferably no less than 1 μm and no greater than 200 μm. The ratio of the average height to the average diameter of the printed dots is preferably no less than 1/100 and no greater than 1. The printed dot preferably has a hemisphere-like shape having a height less than a diameter. The arrangement density of the printed dots on the back face of the substrate sheet is preferably no less than 10 dots/mm2 and no greater than 2,500 dots/mm2. A principal component of the printed dots is preferably is preferably an acrylic resin, a urethane resin or an acrylic urethane resin.
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公开(公告)号：US10718892B2
公开(公告)日：2020-07-21
申请号：US16657679
申请日：2019-10-18
申请人： KEIWA Inc.
IPC分类号： F21V8/00
摘要： A backlight unit satisfies the relationship given by the following expression: S
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3.发明申请公开(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.
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.
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公开(公告)号：US11131799B2
公开(公告)日：2021-09-28
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).
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公开(公告)号：US10386567B2
公开(公告)日：2019-08-20
申请号：US15595445
申请日：2017-05-15
申请人： KEIWA INC.
摘要： An optical sheet for a liquid crystal display device includes a plurality of protruding portions provided scatteredly on a back face, in which the protruding portions each have a flattened semi-spherical shape or a flattened conical shape with a rounded apex. The protruding portions may each have a half spheroidal shape. An occupancy area ratio of the plurality of protruding portions may be no less than 2% and no greater than 80%. An average diameter of the protruding portions may be no less than 5 μm and no greater than 60 μm, and an average height of the protruding portions may be no less than 0.5 μm. A diffraction grating shape with multiple rows that are oriented in a single direction on the back face in a region where the plurality of protruding portions are absent.
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公开(公告)号：US10754083B2
公开(公告)日：2020-08-25
申请号：US16061706
申请日：2016-12-13
申请人： KEIWA INC.
摘要： An optical sheet for a backlight unit for guiding toward a front face side rays of light emitted by an LED light source. The optical sheet includes one or more resin layers. Ultrafine grooves oriented in specific directions are provided on a front face side or a back face side of at least one resin layer of the one or more resin layers. An average number of the ultrafine grooves per unit length in a direction perpendicular to an average orientation of the ultrafine grooves is preferably no less than 10/mm and no greater than 10,000/mm. A face of the at least one resin layer provided with the ultrafine grooves preferably has an arithmetic average roughness (Ra) in a direction perpendicular to an orientation of the ultrafine grooves being no less than 0.01 μm and no greater than 5 μm. Ultrafine grooves preferably constitute a diffraction grating.
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公开(公告)号：US10466405B2
公开(公告)日：2019-11-05
申请号：US15622550
申请日：2017-06-14
申请人： KEIWA INC.
IPC分类号： F21V8/00
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.
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公开(公告)号：US10459151B2
公开(公告)日：2019-10-29
申请号：US15856224
申请日：2017-12-28
申请人： KEIWA INC.
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.
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