公开(公告)号：US20240418925A1

公开(公告)日：2024-12-19

申请号：US18679541

申请日：2024-05-31

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Nobuyuki SUZUKI ,  Shinichi KOMURA ,  Hiroaki KIJIMA ,  Koichi OKUDA

IPC: F21V8/00 ,  G02F1/13357

Abstract: A backlight includes: a light guide plate including a front surface and a back surface, the light guide plate including an end face that connects one edge of the front surface and one edge of the back surface, at least part of the end face being inclined at an angle other than a right angle relative to the front surface; and a light source that emits light, the light source being set in an arrangement enabling emission of the light parallel to the front surface towards the at least part of the end face of the light guide plate, wherein the light is incident on and refracted at the at least part of the end face, propagates inside a material of the light guide plate, is reflected off the back surface, and is surface-emitted from the front surface.

公开(公告)号：US20230417392A1

公开(公告)日：2023-12-28

申请号：US18244545

申请日：2023-09-11

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Makoto HASEGAWA ,  Nobuyuki SUZUKI

IPC: F21V5/02 ,  F21V7/00

CPC classification number: F21V5/02 ,  F21V7/005 ,  F21V2200/20 ,  F21Y2115/10

Abstract: Disclosed is a lighting device including a light guide plate, a plurality of LEDs, a prism sheet disposed on a side toward the upper surface of the light guide plate, and a reflective sheet disposed on a side toward the lower surface of the light guide plate. The plurality of LEDs are arrayed on a side surface corresponding to a first side of the light guide plate in a first direction along the first side. The prism sheet includes a first prism array that is formed on a surface facing the light guide plate. The first prism array includes prisms that are extended in the first direction and arrayed in a second direction perpendicular to the first direction. The upper surface of the light guide plate and the prism sheet sandwich a diffusion sheet therebetween. The diffusion sheet has a haze value between 30% and 65% when measured in compliance with JIS K7361. The prisms on the first prism array have an apex angle between 55 degrees and 66 degrees.

公开(公告)号：US20230314869A1

公开(公告)日：2023-10-05

申请号：US18331963

申请日：2023-06-09

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: G02F1/13357 ,  F21S2/00 ,  G02F1/1337 ,  G02F1/1343

CPC classification number: G02F1/1336 ,  F21S2/00 ,  G02F1/1337 ,  G02F1/134309 ,  F21Y2115/10

Abstract: The purpose of the present invention is to realize a lighting device of thin, low power consumption and high emitting efficiency. A concrete structure of the inventions is as follows. A lighting device including a first light guide and a second light guide stacked on the first light guide, a reflecting sheet disposed under the first light guide, and a prism sheet disposed on the first light guide, in which a concentric first prism array is formed on the prism sheet, a plurality of first LEDs are disposed along a circumferential direction of a side wall of a first hole of the first light guide, a plurality of second LEDs are disposed along a circumferential direction of a side wall of a second hole of the second light guide, and the plurality of the first LEDs and the plurality of the second LEDs are displaced in azimuth direction.

公开(公告)号：US20230027661A1

公开(公告)日：2023-01-26

申请号：US17863456

申请日：2022-07-13

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: F21V7/04 ,  G03B21/20

Abstract: The purpose is to realize a lighting device which can project a light spot of rectangle with a simple structure. The invention is: A lighting device having a light source unit 1, the light source unit 1 including a funnel shaped reflector 10 and an LED 20, in which the funnel shaped reflector 10 includes a neck and an opening, the LED 20 is disposed at the neck of the funnel shaped reflector 10, a plan view of the opening is a rectangle, and provided a distance from the neck to the opening along axis is d, and one side of the rectangle is x, either one of the first light source unit and the second light source unit satisfies, d / x is 2 or larger.

公开(公告)号：US20230015472A1

公开(公告)日：2023-01-19

申请号：US17954371

申请日：2022-09-28

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI

IPC: F21V8/00 ,  G02F1/29

Abstract: A lighting device including: a light guide, a reflecting sheet and a first prism sheet, in which a first white LED, a second white LED and a third white LED are disposed in a same interval on a first side surface and on a second side surface, which opposes to the first side surface, a first prism array extending in a first direction and arranged in a second direction is formed on the major surface, a second prism array extending in a second direction and arranged in a first direction is formed on the back surface, the reflecting sheet is disposed under the back surface of the light guide, the first prism sheet is disposed on the major surface of the light guide, and a third prism array, extending in the second direction and arranged in the first direction is formed on the back surface of the first prism sheet.

公开(公告)号：US20210325024A1

公开(公告)日：2021-10-21

申请号：US17226144

申请日：2021-04-09

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Ken KAGABU

IPC: F21V14/00 ,  F21V7/06 ,  G02F1/1337 ,  G02F1/1343 ,  F21V29/76 ,  F21V31/04 ,  G02F1/137 ,  F21V7/00

Abstract: The purpose of the present invention is to realize a lighting device of thin, low power consumption and small light distribution angle. The present invention takes the following structure to realize the above task: A lighting device having an emitting surface and a bottom opposing to the emitting surface including: a resin, set between the emitting surface and the bottom, having a hole at a center, a reflection block set in the hole at a side of the emitting surface, an LED, which is a light source, set in the hole at a side of the bottom, a space between the LED and the reflection block, in which the resin is contained in a container whose inner surface is a reflecting surface.

公开(公告)号：US20210311245A1

公开(公告)日：2021-10-07

申请号：US17219881

申请日：2021-04-01

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Michihide SHIBATA

IPC: F21V8/00 ,  G02F1/1335

Abstract: According to one embodiment, an electronic equipment includes a liquid crystal panel, an illumination device, and a light receiving element. The illumination device includes a first light guide which includes a first opening, a first light source, a second light guide including a first area, a second area, a first main surface, a second main surface, a first side surface, a second side surface, and a continuous surface, a second light source opposed to each of the continuous surface and the second side surface, and a light reflective layer covering each of the continuous surface and the first side surface.

公开(公告)号：US20180364407A1

公开(公告)日：2018-12-20

申请号：US16053041

申请日：2018-08-02

Applicant: Japan Display Inc.

Inventor： Munenori MOTOOKA ,  Nobuyuki SUZUKI

IPC: F21V8/00 ,  G02F1/1335

CPC classification number: G02B6/0023 ,  G02B6/0013 ,  G02B6/0051 ,  G02B6/0053 ,  G02B6/0055 ,  G02B6/0083 ,  G02B6/0088 ,  G02F1/133615 ,  G02F2001/133612

Abstract: A backlight unit includes a light source having an emission region, a wiring board having the light source mounted thereon, a light guide plate having a side surface into which light from the light source enters, and a front surface from which the light exits, a light shielding adhesive tape adhering to the wiring board, and an optical sheet which overlaps with the front surface of the light guide plate. The front surface of the light guide plate includes an effective region serving as a planar light source and a light entering region ranging from the side surface to the effective region. The wiring board and the light-shielding adhesive tape each have a part positioned in the light entering region, and the optical sheet is arranged from the effective region to the light entering region. An end portion of the optical sheet overlaps with the light-shielding tape.

公开(公告)号：US20250068011A1

公开(公告)日：2025-02-27

申请号：US18796391

申请日：2024-08-07

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Michihide SHIBATA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: G02F1/1335 ,  G02F1/13357

Abstract: A backlight includes: a light source capable of emitting light spreading in first and second directions perpendicular to each other, from an optical axis; a first cylindrical lens that refracts and brings the light closer along the first direction to the optical axis, the first cylindrical lens overlapping with the light source in a third direction perpendicular to the first and second directions; a second cylindrical lens that refracts and brings the light even closer along the first direction to the optical axis, the second cylindrical lens overlapping with the light source and the first cylindrical lens in the third direction; and a reflector that reflects and brings the light closer along the second direction to the optical axis, the reflector being positioned between the first cylindrical lens and the second cylindrical lens in the third direction, the reflector avoiding overlap with the light source.

公开(公告)号：US20240255691A1

公开(公告)日：2024-08-01

申请号：US18631044

申请日：2024-04-10

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21V8/00

CPC classification number: G02B6/0076 ,  G02B6/0025 ,  G02B6/0053 ,  G02B6/0068

Abstract: According to one embodiment, in an illumination device, a second light guide includes a plurality of fourth projecting portions provided in a first area of a fifth main surface opposing a prism sheet, a plurality of fifth projecting portions provided in a second area of a fifth main surface, and a plurality of sixth projecting portions on a sixth main surface opposing the fifth main surface, cross-sectional shapes of the fourth projecting portions and the fifth projecting portions are scalene triangles, and the fourth projecting portions and the fifth projecting portions are arranged in respective positions line-symmetrical position with respect to each other in plan view.