公开(公告)号：US20230018610A1

公开(公告)日：2023-01-19

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

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：US20220260217A1

公开(公告)日：2022-08-18

申请号：US17569525

申请日：2022-01-06

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Takeo KOITO ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21K9/233 ,  F21K9/61 ,  F21V8/00

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.