公开(公告)号：US20250146648A1

公开(公告)日：2025-05-08

申请号：US18888242

申请日：2024-09-18

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: F21V13/04 ,  F21Y115/10 ,  G02B17/08

Abstract: The incident surface is the inner surface of a recess including a bottom surface and an inwardly convex inner side. A tangent line on the free-form curve forms a smaller angle with the optical axis at a point closer to the bottom surface and a larger angle with the optical axis at a point farther from the bottom surface. The free-form curve has a curvature that is not constant. The curvature is maximized at a depth of one-third or less of a depth of the recess. The light enters the bottom surface only at a light distribution angle of three degrees. The light enters the inner side at a light distribution angle of more than three degrees. Light incident on the bottom surface exits through the emitting surface. Light incident on the inner side reflects off the outer side and exits through the emitting surface.

公开(公告)号：US20230417396A1

公开(公告)日：2023-12-28

申请号：US18338431

申请日：2023-06-21

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21V13/04 ,  F21V14/00 ,  F21V7/05 ,  F21V7/09

CPC classification number: F21V13/04 ,  F21V14/003 ,  F21V7/05 ,  F21V7/09 ,  F21Y2115/10

Abstract: A lighting device according to the invention includes: a funnel shaped reflector including a first hole in which a light source is disposed, a second hole which emits light, and a reflecting curved surface connecting the first hole with the second hole, a first direction being defined as a direction of a line connecting a center of the first hole with a center of the second hole; a reflection plate, being opposed to the second hole of the funnel shaped reflector, major surface being tilted with a first angle; and a liquid crystal lens including an incident surface and opposing to the reflection plate, a major surface of the incident surface being tilted to the major surface of the reflection plate with a second angle, in which light emitted from the funnel shaped reflector is reflected at the reflection plate, and is emitted from the liquid crystal lens.

公开(公告)号：US20220003916A1

公开(公告)日：2022-01-06

申请号：US17305345

申请日：2021-07-06

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21V8/00

Abstract: According to one embodiment, a light emitting device includes a light guide plate, a prism sheet, and a lenticular lens, wherein, a plurality of first protrusions of the light guide plate are arranged along a first direction and extend along a second direction intersecting the first direction, a plurality of second protrusions of the light guide plate extend along the first direction and are arranged along the second direction, the prism sheet includes a plurality of third protrusions extending along the first direction and arranged in the second direction, and the lenticular lens includes a plurality of fourth protrusions arranged along the first direction and extending along the second direction.

公开(公告)号：US20210318575A1

公开(公告)日：2021-10-14

申请号：US17218613

申请日：2021-03-31

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: G02F1/1335 ,  G02F1/137 ,  G02F1/03

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：US20240219622A1

公开(公告)日：2024-07-04

申请号：US18604918

申请日：2024-03-14

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI ,  Masafumi OKADA

IPC: F21V8/00

CPC classification number: G02B6/0053 ,  G02B6/0076

Abstract: According to one embodiment, an illumination device includes a first projecting portion on a first main surface and a second projecting portion on a second main surface on an opposite side to the first main surface in a first area of a first guide, a third projecting portion on a third main surface opposing the second main surface and a fourth projecting portion on a fourth main surface on an opposite side to the third main surface, in a third area of a second guide, and the first projecting portion and the third projecting portion have a cross sectional shape of a scalene triangle and the second projecting portion and the fourth projecting portion have a cross sectional shape of an isosceles triangle.

公开(公告)号：US20230266619A1

公开(公告)日：2023-08-24

申请号：US18307059

申请日：2023-04-26

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：US20230039243A1

公开(公告)日：2023-02-09

申请号：US17963223

申请日：2022-10-11

Applicant: Japan Display Inc.

Inventor： Makoto HASEGAWA ,  Nobuyuki SUZUKI

IPC: F21V8/00

Abstract: A purpose of the present invention is to realize a prism sheet in which an outer shape is circular and has a concentric prism array. The present invention includes the structure: A prism sheet has a circular outer shape and a concentric prism array on one surface, in which groove is formed in radial direction from a center of the concentric prism array so as to cross the concentric prism array. The air entrained in the prism array during manufacturing is exhausted through the groove.

公开(公告)号：US20220291546A1

公开(公告)日：2022-09-15

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

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：US20220252934A1

公开(公告)日：2022-08-11

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：US20210311359A1

公开(公告)日：2021-10-07

申请号：US17220503

申请日：2021-04-01

Applicant: Japan Display Inc.

Inventor： Masafumi OKADA ,  Nobuyuki SUZUKI ,  Makoto HASEGAWA

IPC: 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.