公开(公告)号：US20230280013A1

公开(公告)日：2023-09-07

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：US20230235863A1

公开(公告)日：2023-07-27

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 ,  F21V5/04 ,  F21V7/00

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

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：US20230086503A1

公开(公告)日：2023-03-23

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

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：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：US20230003363A1

公开(公告)日：2023-01-05

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

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：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.

公开(公告)号：US20220026625A1

公开(公告)日：2022-01-27

申请号：US17493035

申请日：2021-10-04

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 and an illumination device. The illumination device includes a first light guide having a first opening and facing the liquid crystal panel, a first light source facing the first light guide, a second light guide provided in the first opening and having a first main surface facing the liquid crystal panel, a second main surface, and a side surface, a second light source having a light emitting surface facing the side surface, and a wavelength conversion element located between the side surface and the light emitting surface, and configured to convert a wavelength of light from the second light source.

公开(公告)号：US20220019016A1

公开(公告)日：2022-01-20

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：US20210181401A1

公开(公告)日：2021-06-17

申请号：US17183959

申请日：2021-02-24

Applicant: Japan Display Inc.

Inventor： Munenori MOTOOKA ,  Nobuyuki SUZUKI

IPC: F21V8/00 ,  G02F1/13357

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 hoard 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：US20200301060A1

公开(公告)日：2020-09-24

申请号：US16892392

申请日：2020-06-04

Applicant: Japan Display Inc.

Inventor： Munenori MOTOOKA ,  Nobuyuki SUZUKI

IPC: F21V8/00 ,  G02F1/13357

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.