公开(公告)号：US11852303B2

公开(公告)日：2023-12-26

申请号：US18136881

申请日：2023-04-20

Applicant: Japan Display Inc.

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

IPC: F21K9/233 ,  F21K9/61 ,  F21Y115/10 ,  F21V8/00 ,  F21V11/06 ,  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：US11828454B2

公开(公告)日：2023-11-28

申请号：US17943368

申请日：2022-09-13

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Masafumi Okada

IPC: F21V7/00 ,  F21S8/04 ,  F21Y115/10

CPC classification number: F21V7/0091 ,  F21S8/04 ,  F21Y2115/10

Abstract: The purpose of the present invention is to realize a lighting device which can be switched between an overall lighting and a local lighting with a single lighting device. The concrete structure is a lighting device including: a first light guide having a first major surface and a first back surface, and a first hole; a second light guide, disposed on the first light guide, and having a second major surface, a second back surface, and a second hole; a reflection sheet disposed under the first back surface of the first light guide; a liquid crystal lens disposed above the second major surface of the second light guide, in which first LEDs and second LEDs are disposed circumferentially along a side wall of the first hole and a side wall of the second hole, respectively, and the first LEDs and the second LEDs are displaced each other in azimuth direction.

公开(公告)号：US11543585B2

公开(公告)日：2023-01-03

申请号：US17491667

申请日：2021-10-01

Applicant: Japan Display Inc.

Inventor： Hiroyuki Shimokawa ,  Nobuyuki Suzuki

IPC: F21V8/00 ,  G02F1/13357

Abstract: According to one embodiment, an electronic device includes a liquid crystal panel, an illumination device, and a light reflecting material. The illumination device includes a first light guide having an opening, a first light source configured to irradiate the first light guide with light, a second light guide formed in the opening, and a second light source configured to irradiate the second light guide with light. The light reflecting material is located between the first light guide and the second light guide in the opening.

公开(公告)号：US09810827B2

公开(公告)日：2017-11-07

申请号：US15392019

申请日：2016-12-28

Applicant: Japan Display Inc.

Inventor： Munenori Motooka ,  Nobuyuki Suzuki

IPC: F21V7/04 ,  F21V8/00

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：US20170108634A1

公开(公告)日：2017-04-20

申请号：US15392019

申请日：2016-12-28

Applicant: Japan Display Inc.

Inventor： Munenori Motooka ,  Nobuyuki Suzuki

IPC: F21V8/00

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：US12007097B2

公开(公告)日：2024-06-11

申请号：US18378807

申请日：2023-10-11

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Takeo Koito

IPC: G02F1/29 ,  F21V7/00 ,  F21V7/06 ,  F21V14/00 ,  G02F1/1335 ,  G02F1/1343 ,  G02F1/1347

CPC classification number: F21V14/003 ,  F21V7/0016 ,  F21V7/06 ,  G02F1/133528 ,  G02F1/134309 ,  G02F1/1347 ,  G02F1/294

Abstract: A lighting device, comprises: a first reflector that includes a first hole where a light source is disposed, a second hole that emits light, and a reflection curved surface that connects the first hole and the second hole to each other, and the first reflector emits light to a first direction; a liquid crystal lens disposed to cover the second hole of the first reflector; and a polygonal pyramid including a bottom surface and a plurality of inclined surfaces, and being disposed so that the plurality of inclined surfaces oppose the liquid crystal lens. The plurality of inclined surfaces are reflection surfaces, and on the reflection surfaces, a traveling path of the light traveling to the first direction changes to a second direction. The liquid crystal lens can configure lenses corresponding to the plurality of inclined surfaces.

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：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.