公开(公告)号：US20240219622A1

公开(公告)日：2024-07-04

申请号：US18604918

申请日：2024-03-14

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21V8/00

CPC classification number: G02B6/0053 ,  G02B6/0076

Abstract: According to one embodiment, an illumination device includes a first projecting portion on a first main surface and a second projecting portion on a second main surface on an opposite side to the first main surface in a first area of a first guide, a third projecting portion on a third main surface opposing the second main surface and a fourth projecting portion on a fourth main surface on an opposite side to the third main surface, in a third area of a second guide, and the first projecting portion and the third projecting portion have a cross sectional shape of a scalene triangle and the second projecting portion and the fourth projecting portion have a cross sectional shape of an isosceles triangle.

公开(公告)号：US20230266619A1

公开(公告)日：2023-08-24

申请号：US18307059

申请日：2023-04-26

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: G02F1/13357 ,  G02F1/1335

CPC classification number: G02F1/133603 ,  G02F1/133526 ,  G02F1/133607

Abstract: According to one embodiment, a light emitting device includes a light guide plate with a plurality of first protrusion parts arranged along a first direction and extending along a second direction which crosses the first direction, and a prism sheet, wherein a cross-sectional shape of each of the first protrusion parts along the first direction has an apex angle between 55 degrees and 65 degrees, inclusive, the light guide plate includes a plurality of second protrusion parts which extend along the first direction and are arranged along the second direction, and a cross-sectional shape of each of the second protrusion parts along the second direction has a base angle between 1 degree and 3 degrees, inclusive.

公开(公告)号：US20220291546A1

公开(公告)日：2022-09-15

申请号：US17829425

申请日：2022-06-01

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: According to one embodiment, a light emitting device includes a light guide plate with a plurality of first protrusion parts arranged along a first direction and extending along a second direction which crosses the first direction, and a prism sheet, wherein a cross-sectional shape of each of the first protrusion parts along the first direction has an apex angle between 55 degrees and 65 degrees, inclusive, the light guide plate includes a plurality of second protrusion parts which extend along the first direction and are arranged along the second direction, and a cross-sectional shape of each of the second protrusion parts along the second direction has a base angle between 1 degree and 3 degrees, inclusive.

公开(公告)号：US20220252934A1

公开(公告)日：2022-08-11

申请号：US17683619

申请日：2022-03-01

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: G02F1/1335 ,  G02F1/03 ,  G02F1/137

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 comprising: a disc shaped light guide, having a main surface and a rear surface, including a first hole at a center, a disc shaped reflection sheet, disposed at the rear surface side of the light guide, including a second hole at a center, a prism sheet, disposed at the main surface side of the light guide, including a concentric first prism array, wherein a reflection mirror is set in the first hole of the light guide at the side near to the prism sheet, an LED is set opposing to the reflection mirror.

公开(公告)号：US20220066266A1

公开(公告)日：2022-03-03

申请号：US17454642

申请日：2021-11-12

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Masafumi OKADA ,  Toshihiro YAJIMA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: According to one embodiment, an illuminating device includes a wiring substrate, light emitting elements, a wavelength conversion element, and a protrusion. A main surface of the wiring substrate is divided into segment areas. N light emitting elements are disposed in each of the segment areas. N is greater than 1. The light emitting elements are driven independently in units of the segment areas. The protrusion protrudes from the wiring substrate toward the wavelength conversion element between two segment areas adjacent to each other.

公开(公告)号：US20210318483A1

公开(公告)日：2021-10-14

申请号：US17357145

申请日：2021-06-24

Applicant: Japan Display Inc.

Inventor： Koji HIRAMOTO ,  Masafumi OKADA ,  Hiroshi NAKAMOTO ,  Ken KAGABU ,  Ken SUGIYAMA

IPC: F21V8/00

Abstract: According to an aspect, a display device includes: a display panel configured to transmit light; and an illumination device provided on a rear surface side of the display panel. The illumination device includes a plurality of light sources configured to emit light, and a light guiding member that has translucency and is arranged between the light sources on the rear surface side of the display panel. The light guiding member has a plurality of holes each of which opens in a first direction intersecting with a rear surface of the display panel and in each of which a corresponding one of the light sources is disposed, and a light guiding portion surrounding the holes. A rear surface of the light guiding portion is provided with a first inclined surface inclined with respect to the first direction and a plane orthogonal to the first direction.

公开(公告)号：US20210311359A1

公开(公告)日：2021-10-07

申请号：US17220503

申请日：2021-04-01

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: According to one embodiment, a light emitting device includes a light guide plate with a plurality of first protrusion parts arranged along a first direction and extending along a second direction which crosses the first direction, and a prism sheet, wherein a cross-sectional shape of each of the first protrusion parts along the first direction has an apex angle between 55 degrees and 65 degrees, inclusive, the light guide plate includes a plurality of second protrusion parts which extend along the first direction and are arranged along the second direction, and a cross-sectional shape of each of the second protrusion parts along the second direction has a base angle between 1 degree and 3 degrees, inclusive.

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.