公开(公告)号：US11703710B2

公开(公告)日：2023-07-18

申请号：US17954331

申请日：2022-09-28

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Nobuyuki Suzuki ,  Masafumi Okada

IPC: G02F1/13357 ,  G02F1/1337 ,  G02F1/1343 ,  F21S2/00 ,  F21Y115/10

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：US12197075B2

公开(公告)日：2025-01-14

申请号：US18415697

申请日：2024-01-18

Applicant: Japan Display Inc.

Inventor： Koji Fujisawa ,  Michihide Shibata ,  Masafumi Okada

IPC: G02F1/1335 ,  F21V8/00 ,  G02F1/13357

Abstract: In a backlight that includes a plurality of LEDs and a prism sheet disposed opposite to the LEDs, the prism sheet has a first surface opposite to the LEDs and a second surface on the opposite side of the first surface, a first prism having a first base and a first pitch L1 is formed on the first surface, a second prism having a cross section that is scalene triangular in shape having a second base having a length L2, a first base angle θ1, and a second base angle θ2 smaller than the first base angle is formed on the second surface, and L2

公开(公告)号：US12099273B2

公开(公告)日：2024-09-24

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 ,  F21Y115/10

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：US12018831B2

公开(公告)日：2024-06-25

申请号：US18116878

申请日：2023-03-03

Applicant: Japan Display Inc.

Inventor： Masafumi Okada ,  Nobuyuki Suzuki ,  Makoto Hasegawa

IPC: F21V5/00 ,  F21V7/06 ,  F21V9/08 ,  G02F1/29

CPC classification number: F21V5/008 ,  F21V7/06 ,  F21V9/08 ,  G02F1/29

Abstract: The purpose is to realize a lighting device of thin, small light distribution angle, and less leak light. Further, the purpose is to realize a lighting device which can control light beam accurately with liquid crystal lenses. The structure of the invention is as follows. A lighting device including: a reflector cylinder including a mirror thereinside; and a liquid crystal lens assembly that is disposed at a light emitting surface of the reflector cylinder and includes a plurality of liquid crystal lenses being stacked, in which the liquid crystal lens assembly includes a light shading film which defines a light emitting area of the liquid crystal lens assembly and which is formed in parallel with the light emitting surface of the reflector cylinder.

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：US11513279B2

公开(公告)日：2022-11-29

申请号：US17696965

申请日：2022-03-17

Applicant: Japan Display Inc.

Inventor： Makoto Hasegawa ,  Masafumi Okada

IPC: F21V8/00

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.