公开(公告)号：US12196410B2

公开(公告)日：2025-01-14

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 ,  F21V8/00 ,  F21Y115/10

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：US11885478B2

公开(公告)日：2024-01-30

申请号：US17939408

申请日：2022-09-07

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Ken Kagabu

IPC: F21V14/00 ,  F21V7/06 ,  G02F1/1337 ,  G02F1/1343 ,  F21V31/04 ,  G02F1/137 ,  F21V7/00 ,  F21V29/76 ,  F21Y115/10

CPC classification number: F21V14/003 ,  F21V7/0033 ,  F21V7/06 ,  F21V29/763 ,  F21V31/04 ,  G02F1/137 ,  G02F1/133738 ,  G02F1/133742 ,  G02F1/134309 ,  F21Y2115/10 ,  G02F2201/122

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：US11668976B2

公开(公告)日：2023-06-06

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

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：US11378841B2

公开(公告)日：2022-07-05

申请号：US17220503

申请日：2021-04-01

Applicant: Japan Display Inc.

Inventor： Masafumi Okada ,  Nobuyuki Suzuki ,  Makoto Hasegawa

IPC: G09F13/04 ,  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：US12292593B2

公开(公告)日：2025-05-06

申请号：US18366773

申请日：2023-08-08

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Masafumi Okada

IPC: F21V8/00

Abstract: A lighting device capable of changing light direction includes: a light guide plate having a first side surface extending in a first direction; and LEDs at the first side surface, in which the light guide plate has a first area extending in a second direction which is a direction perpendicular to the first direction and a second area extending in the second direction and adjacent to the first area, corresponding to the first area, at least one LED is arranged at the first side surface, corresponding to the second area, at least one LED is arranged at the first side surface, a first prism array is formed under a bottom surface of the first area, and a second prism array is formed under a bottom surface of the second area, and a prism height of the second prism array is taller than a prism height of the first prism array.

公开(公告)号：US12248167B2

公开(公告)日：2025-03-11

申请号：US18631044

申请日：2024-04-10

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Masafumi Okada

IPC: F21V8/00

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.

公开(公告)号：US12013610B2

公开(公告)日：2024-06-18

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：US11899309B2

公开(公告)日：2024-02-13

申请号：US17553068

申请日：2021-12-16

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa

IPC: G02F1/13357 ,  G02F1/1333 ,  G02F1/1335

CPC classification number: G02F1/133606 ,  G02F1/13332 ,  G02F1/133524 ,  G02F1/133603

Abstract: According to one embodiment, an electronic apparatus comprises a liquid crystal panel, and an illumination device that illuminates the liquid crystal panel, wherein the illumination device includes a light guide having a recess portion recessed from a first side surface toward a second side surface on the first side surface, and a third side surface exposed by the recess portion and opposed to the second side surface, a plurality of first light sources opposed to the first side surface, and a plurality of second light sources located in the recess portion and opposed to the third side surface, and each of the second light sources has a light-emitting surface smaller than that of each of the first light sources.

公开(公告)号：US11789193B2

公开(公告)日：2023-10-17

申请号：US17979788

申请日：2022-11-03

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Masafumi Okada

IPC: F21V8/00

CPC classification number: G02B6/0053 ,  G02B6/0073

Abstract: A lighting device including: a light guide having a first side surface extending in a first direction and a second side surface opposing to the first side surface and extending in the first direction, a first LED being disposed at the first side surface, a second LED being disposed at the second side surface; in which a first area extends in the first direction and a second area extends in the second direction in the light guide; a prism sheet is disposed on the light guide; a prism extending in the first direction and arranged in the second direction is formed on the prism sheet; a first surface of the prism has a first angle with normal direction of the second prism sheet; a second surface of the prism has a second angle with normal direction of the second prism sheet; the first angle is larger than the second angle.

公开(公告)号：US11747670B2

公开(公告)日：2023-09-05

申请号：US18070820

申请日：2022-11-29

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Masafumi Okada

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

CPC classification number: G02F1/133526 ,  G02F1/0316 ,  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.