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：US12038648B2

公开(公告)日：2024-07-16

申请号：US18342841

申请日：2023-06-28

Applicant: Japan Display Inc.

Inventor： Masafumi Okada ,  Shinichi Komura ,  Ken Onoda

IPC: G02F1/13357 ,  G02F1/1335

CPC classification number: G02F1/133621 ,  G02F1/133609 ,  G02F1/133613 ,  G02F1/133603

Abstract: According to one embodiment, an illumination device includes red light emitting elements, green light emitting elements and blue light emitting elements opposing a first side surface of a first light guide, and the red light emitting elements, the green light emitting elements and the blue light emitting elements are disposed along the first side surface in a third direction that intersects the first direction and the second direction, and, arranged to be symmetrical with respect to a central axis of the third direction of the first side 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：US11898709B2

公开(公告)日：2024-02-13

申请号：US18099354

申请日：2023-01-20

Applicant: Japan Display Inc.

Inventor： Takashi Ota ,  Nobuyuki Suzuki ,  Makoto Hasegawa ,  Masafumi Okada

IPC: F21K9/68 ,  F21K9/69 ,  F21V7/00 ,  F21V5/04 ,  G02F1/1335 ,  F21Y115/10

CPC classification number: F21K9/68 ,  F21K9/69 ,  F21V5/04 ,  F21V7/0066 ,  F21Y2115/10 ,  G02F1/133526

Abstract: A lighting device including a first unit and a second unit, the first unit including: a first funnel shaped reflector having a first neck, a first opening, a first reflecting surface and a first light axis, a first LED emitting a first color disposed on the first neck, a first liquid crystal lens disposed at the first opening, a second unit including: a second funnel shaped reflector having a second neck, a second opening, a second reflecting surface and a second light axis, a second LED emitting a second color disposed on the second neck, a second liquid crystal lens disposed at the second opening; a length h1 of the first funnel shaped reflector is same as a length of the second funnel shaped reflector, and a diameter d1 of the first opening is same as a diameter of the second opening, and h1/d1 is two or more.

公开(公告)号：US11768325B2

公开(公告)日：2023-09-26

申请号：US17742653

申请日：2022-05-12

Applicant: Japan Display Inc.

Inventor： Koji Hiramoto ,  Masafumi Okada ,  Hiroshi Nakamoto ,  Ken Kagabu ,  Ken Sugiyama

IPC: F21V8/00 ,  G02F1/13357

CPC classification number: G02B6/0045 ,  G02B6/0021 ,  G02B6/0066 ,  G02B6/0073 ,  G02F1/133603

Abstract: Display device is provided and includes display panel; and illumination device provided on rear surface side of display panel, wherein illumination device includes light sources, and light guiding member arranged at rear surface side of display panel, light guiding member has holes which penetrates the light guiding member, light sources are housed in corresponding hole, rear surface of light guiding member has first inclined surface inclined upwardly from light source housed in one of holes, front surface side of light guiding member has second inclined surface inclined upwardly from light source housed in one of the holes, and angle of first inclined surface to center line of one of holes is greater than angle of second inclined surface to center line.

公开(公告)号：US11739909B2

公开(公告)日：2023-08-29

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 ,  F21Y115/10

CPC classification number: F21V7/041 ,  G03B21/2066 ,  F21Y2115/10

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：US11655944B2

公开(公告)日：2023-05-23

申请号：US17569525

申请日：2022-01-06

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Takeo Koito ,  Nobuyuki Suzuki ,  Masafumi Okada

IPC: F21V11/06 ,  F21Y115/10 ,  F21K9/233 ,  F21K9/61 ,  F21V8/00 ,  F21V14/00 ,  F21V5/00

CPC classification number: F21K9/233 ,  F21K9/61 ,  F21V5/005 ,  F21V11/06 ,  F21V14/003 ,  G02B6/003 ,  G02B6/0053 ,  F21Y2115/10

Abstract: The purpose of the present invention is to realize a lighting device of small light distribution angle and less leakage light and further to realize a lighting device in which the light beam is easy to control. The following is an example of the structure to meet the above purpose. A lighting device including: a light guide; LEDs set at a side surface of the light guide; a prism sheet set on a major surface of the light guide, in which a first louver which extends in a first direction and, a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet.

公开(公告)号：US11537001B2

公开(公告)日：2022-12-27

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：US11333818B2

公开(公告)日：2022-05-17

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 ,  G02F1/13357

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.