公开(公告)号：US20190086604A1

公开(公告)日：2019-03-21

申请号：US16088461

申请日：2017-03-22

Applicant: Sharp Kabushiki Kaisha

Inventor： Hirotoshi YASUNAGA ,  Hisashi WATANABE ,  Youzou KYOUKANE

IPC: F21V8/00

CPC classification number: G02B6/0061 ,  G02B6/00 ,  G02B6/0038 ,  G02B6/0055 ,  G02B6/0088 ,  G02F1/133524 ,  G02F1/133615

Abstract: A backlight unit includes an LED, a light guide plate, a light collecting portion, an opposite end portion, and a total reflection regulator. The light guide plate includes a light entering end surface opposed to the LED and a light exiting surface that is one of plate surfaces. The light collecting portion includes light collecting pieces extending on the light exiting surface in a normal direction to the light entering end surface and arrayed in an orthogonal direction perpendicular to the normal direction. The opposite end portion is on an opposite side from the light entering end surface. A section of the opposite end portion includes a curved end surface. The total reflection regulator is disposed on at least a portion of the curved end surface and configured to regulate the amount of light in the opposite end portion to be totally reflected by the curved end surface.

公开(公告)号：US20200326470A1

公开(公告)日：2020-10-15

申请号：US16305418

申请日：2017-08-07

Applicant: Sharp Kabushiki Kaisha

Inventor： Youzou KYOUKANE ,  Hisashi WATANABE ,  Hirotoshi YASUNAGA ,  Ryuzo YUKI

IPC: F21V8/00 ,  H05K1/02

Abstract: The light input efficiency of a light-emitting device into a circular disc-shaped or elliptical disc-shaped light guide plate is increased. A light-emitting device includes a first light-emitting unit (12a) that includes a plurality of light-emitting elements (L1 to L5) arranged curvilinearly, a second light-emitting unit (12b) that includes a plurality of light-emitting elements (L6 to L10) arranged curvilinearly, and a coupling portion (12c) that is disposed so as to coincide with a region (SA) sandwiched by the first and second light-emitting units and couples the first and second light-emitting units.

公开(公告)号：US20190094448A1

公开(公告)日：2019-03-28

申请号：US16082587

申请日：2017-03-10

Applicant: Sharp Kabushiki Kaisha

Inventor： Hisashi WATANABE ,  Hirotoshi YASUNAGA ,  Youzou KYOUKANE ,  Takeshi ISHIDA

IPC: F21V8/00

Abstract: A backlight device 12 includes LEDs 15, a light guide plate 17 having a light entering edge surface 17a opposite the LEDs 15 and having plate surfaces one of which is alight exit plate surface 17b, and a light collecting portion 22 including unit light collecting portions 22a that extend in a normal direction of the light entering edge surface 17a on the light exit plate surface 17b and are arranged in a perpendicular direction perpendicular to the normal direction. The light guide plate 17 includes an opposite edge portion 23 that is opposite from an end portion thereof having the light entering edge surface 17a, the opposite edge portion 23 has an edge surface a part of which is a curved edge surface 24 having a curved planar shape and the opposite edge portion 23 has the light exit plate surface 17b a part of which is a light collecting portion non-forming section 25 on which no light collecting portion 22 is formed.