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公开(公告)号：US20220299697A1
公开(公告)日：2022-09-22
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.
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公开(公告)号：US20220268986A1
公开(公告)日：2022-08-25
申请号：US17742653
申请日：2022-05-12
Applicant: Japan Display Inc.
Inventor： Koji HIRAMOTO , Masafumi OKADA , Hiroshi NAKAMOTO , Ken KAGABU , Ken SUGIYAMA
IPC: F21V8/00 , G02F1/13357
Abstract: Display device is provided and includes display panel; and illumination device provided on rear surface side of display panel, wherein illumination device includes light sources, and light guiding member arranged at rear surface side of display panel, light guiding member has holes which penetrates the light guiding member, light sources are housed in corresponding hole, rear surface of light guiding member has first inclined surface inclined upwardly from light source housed in one of holes, front surface side of light guiding member has second inclined surface inclined upwardly from light source housed in one of the holes, and angle of first inclined surface to center line of one of holes is greater than angle of second inclined surface to center line.
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公开(公告)号：US20250068011A1
公开(公告)日：2025-02-27
申请号：US18796391
申请日：2024-08-07
Applicant: Japan Display Inc.
Inventor： Takashi OTA , Michihide SHIBATA , Nobuyuki SUZUKI , Masafumi OKADA
IPC: G02F1/1335 , G02F1/13357
Abstract: A backlight includes: a light source capable of emitting light spreading in first and second directions perpendicular to each other, from an optical axis; a first cylindrical lens that refracts and brings the light closer along the first direction to the optical axis, the first cylindrical lens overlapping with the light source in a third direction perpendicular to the first and second directions; a second cylindrical lens that refracts and brings the light even closer along the first direction to the optical axis, the second cylindrical lens overlapping with the light source and the first cylindrical lens in the third direction; and a reflector that reflects and brings the light closer along the second direction to the optical axis, the reflector being positioned between the first cylindrical lens and the second cylindrical lens in the third direction, the reflector avoiding overlap with the light source.
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公开(公告)号：US20240255801A1
公开(公告)日：2024-08-01
申请号：US18415697
申请日：2024-01-18
Applicant: Japan Display Inc.
Inventor： Koji FUJISAWA , Michihide SHIBATA , Masafumi OKADA
IPC: G02F1/1335 , G02F1/13357
CPC classification number: G02F1/133607 , G02F1/133603
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
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公开(公告)号：US20240255691A1
公开(公告)日：2024-08-01
申请号：US18631044
申请日：2024-04-10
Applicant: Japan Display Inc.
Inventor： Makoto HASEGAWA , Nobuyuki SUZUKI , Masafumi OKADA
IPC: F21V8/00
CPC classification number: G02B6/0076 , G02B6/0025 , G02B6/0053 , G02B6/0068
Abstract: According to one embodiment, in an illumination device, a second light guide includes a plurality of fourth projecting portions provided in a first area of a fifth main surface opposing a prism sheet, a plurality of fifth projecting portions provided in a second area of a fifth main surface, and a plurality of sixth projecting portions on a sixth main surface opposing the fifth main surface, cross-sectional shapes of the fourth projecting portions and the fifth projecting portions are scalene triangles, and the fourth projecting portions and the fifth projecting portions are arranged in respective positions line-symmetrical position with respect to each other in plan view.
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Patent Agency Ranking
公开(公告)号：US20230375775A1
公开(公告)日：2023-11-23
申请号：US18366773
申请日：2023-08-08
Applicant: Japan Display Inc.
Inventor： Makoto HASEGAWA , Masafumi OKADA
IPC: F21V8/00
CPC classification number: G02B6/0073 , G02B6/0053 , G02B6/0036 , G02B6/0075
Abstract: A lighting device capable of changing light direction includes: a light guide plate having a first side surface extending in a first direction; and LEDs at the first side surface, in which the light guide plate has a first area extending in a second direction which is a direction perpendicular to the first direction and a second area extending in the second direction and adjacent to the first area, corresponding to the first area, at least one LED is arranged at the first side surface, corresponding to the second area, at least one LED is arranged at the first side surface, a first prism array is formed under a bottom surface of the first area, and a second prism array is formed under a bottom surface of the second area, and a prism height of the second prism array is taller than a prism height of the first prism array.
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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
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.
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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
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.
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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
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.
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公开(公告)号：US20230056516A1
公开(公告)日：2023-02-23
申请号：US17979788
申请日：2022-11-03
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.
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