公开(公告)号：US12135457B2

公开(公告)日：2024-11-05

申请号：US18430928

申请日：2024-02-02

Applicant: Japan Display Inc. ,  OSAKA UNIVERSITY

Inventor： Koichi Igeta ,  Shinichiro Oka ,  Yasushi Tomioka ,  Junji Kobashi ,  Hiroyuki Yoshida

IPC: G02B6/27 ,  G02F1/13

Abstract: According to one embodiment, a liquid crystal optical element includes an optical waveguide including a first main surface and a second main surface opposed to the first main surface, an alignment film disposed on the second main surface, a liquid crystal layer which overlaps the alignment film, which includes cholesteric liquid crystals, and which reflects at least part of light incident through the optical waveguide toward the optical waveguide, and a transparent first protective layer which overlaps the liquid crystal layer, and which is formed of a water-soluble polymer or a fluorine-based resin.

公开(公告)号：US11982825B2

公开(公告)日：2024-05-14

申请号：US18319000

申请日：2023-05-17

Applicant: Japan Display Inc. ,  OSAKA UNIVERSITY

Inventor： Koichi Igeta ,  Shinichiro Oka ,  Yasushi Tomioka ,  Hiroyuki Yoshida

IPC: G02B5/30 ,  C09K19/36 ,  C09K19/54 ,  G02B5/18

CPC classification number: G02B5/3016 ,  C09K19/36 ,  C09K19/54 ,  G02B5/1833 ,  G02B5/1857

Abstract: According to one embodiment, a liquid crystal optical element includes a transparent substrate including a main surface, an alignment film disposed on the main surface, and a liquid crystal layer overlapping the alignment film and including a cholesteric liquid crystal including liquid crystal molecules stacked helically and an additive exhibiting a liquid crystalline property. In the liquid crystal layer, a reflective surface along which alignment directions of the liquid crystal molecules are identical is inclined with respect to the main surface.

公开(公告)号：US11249224B2

公开(公告)日：2022-02-15

申请号：US16938883

申请日：2020-07-24

Applicant: OSAKA UNIVERSITY

Inventor： Giichi Shibuya ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02B3/08 ,  G02F1/1343 ,  G02B3/10 ,  G02F1/13 ,  G02C7/00 ,  G02F1/1333 ,  G02F1/1347 ,  G02F1/29 ,  G02F1/133 ,  G02C7/04 ,  G02F1/137

Abstract: A liquid crystal element (100) refracts and outputs light. The liquid crystal element (100) includes a first electrode (1), a second electrode (2), an insulating layer (21) that is an electric insulator, a resistance layer (22), a liquid crystal layer (23) including liquid crystal, and a third electrode (3). The insulating layer (21) is disposed between each location of the first and second electrodes (1) and (2) and the resistance layer (22) to insulate the first and second electrodes (1) and (2) from the resistance layer (22). The resistance layer (22) has an electrical resistivity higher than that of the first electrode (1) and lower than that of the insulating layer (21). The resistance layer (22) and the liquid crystal layer (23) are disposed between the insulating layer (21) and the third electrode (3). The resistance layer (22) is disposed between the insulating layer (21) and the liquid crystal layer (23). The insulating layer (21) has a thickness (ts) smaller than a thickness (th) of the resistance layer (22).

公开(公告)号：US11150392B2

公开(公告)日：2021-10-19

申请号：US16463676

申请日：2017-11-15

Applicant: OSAKA UNIVERSITY

Inventor： Hiroyuki Yoshida

IPC: G02B5/30 ,  G02B5/18 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/29

Abstract: An optical element 1 includes a first layer (A1) and a second layer (A2) that faces the first layer (A1). The first layer (A1) includes a plurality of first structural bodies (B1) that each have optical anisotropy. In reflection of light entering from the first layer (A1), the second layer (A2) reflects the light while maintaining a polarization state of the light at incidence and at the reflection. The first layer (A1) changes, according to directions of orientation of the first structural bodies (B1), a phase of the light from a phase at incidence to the first layer (A1) from outside of the first layer (A1) to a phase at output from the first layer (A1) toward the second layer (A2). The first layer (A1) changes the phase of the light from a phase at incidence to the first layer (A1) from the second layer (A2) to a phase at output from the first layer (A1) toward the outside of the first layer (A1) according to the directions of orientation of the first structural bodies (B1).

公开(公告)号：US12204227B2

公开(公告)日：2025-01-21

申请号：US18396569

申请日：2023-12-26

Applicant: OSAKA UNIVERSITY

Inventor： Giichi Shibuya ,  Sunri Lee ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02F1/29 ,  G02B3/14

Abstract: A liquid crystal element is provided that can inhibit occurrence of voltage drop between one end and the other end of each electrode. A liquid crystal element (100) includes a liquid crystal layer LQ, a plurality of first arcuate electrodes (1), and a plurality of second arcuate electrodes (2). The first arcuate electrodes (1) are disposed concentrically about an optical axis (AX) of the liquid crystal element (100) and applies first voltage (V1) to the liquid crystal layer (LQ). The second arcuate electrodes (2) are disposed concentrically about the optical axis (AX) and applies second voltage (V2) to the liquid crystal layer (LQ).

公开(公告)号：US11860484B2

公开(公告)日：2024-01-02

申请号：US17620349

申请日：2019-06-18

Applicant: OSAKA UNIVERSITY

Inventor： Sunri Lee ,  Giichi Shibuya ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02F1/1339 ,  G02F1/1337 ,  G02F1/1343 ,  G02F1/29

CPC classification number: G02F1/13394 ,  G02F1/1337 ,  G02F1/13398 ,  G02F1/134381 ,  G02F1/294

Abstract: A liquid crystal element (100) includes a plurality of unit electrodes (10), a liquid crystal layer (LQ), and a plurality of wall members (WL). Each of the unit electrodes (10) includes a first electrode (1) and a second electrode (2). A voltage is applied to the liquid crystal layer (LQ) from each of the unit electrodes (10). The wall members (WL) are arranged in the liquid crystal layer (LQ). The liquid crystal layer (LQ) has a waveform retardation (RT). Two or more of a plurality of peaks (P1) in the retardation (RT) correspond to positions of respective wall members (WL).

公开(公告)号：US11762129B2

公开(公告)日：2023-09-19

申请号：US17646582

申请日：2021-12-30

Applicant: OSAKA UNIVERSITY

Inventor： Giichi Shibuya ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02B3/08 ,  G02F1/1343 ,  G02B3/10 ,  G02F1/13 ,  G02C7/00 ,  G02F1/1333 ,  G02F1/1347 ,  G02F1/29 ,  G02F1/133 ,  G02C7/04 ,  G02F1/137

CPC classification number: G02B3/08 ,  G02B3/10 ,  G02C7/00 ,  G02C7/041 ,  G02F1/13 ,  G02F1/133 ,  G02F1/137 ,  G02F1/1343 ,  G02F1/1347 ,  G02F1/133345 ,  G02F1/29 ,  G02F1/294 ,  G02F2201/122

Abstract: A liquid crystal element (100) refracts and outputs light. The liquid crystal element (100) includes a first electrode (1), a second electrode (2), an insulating layer (21) that is an electric insulator, a resistance layer (22), a liquid crystal layer (23) including liquid crystal, and a third electrode (3). The insulating layer (21) is disposed between each location of the first and second electrodes (1) and (2) and the resistance layer (22) to insulate the first and second electrodes (1) and (2) from the resistance layer (22). The resistance layer (22) has an electrical resistivity higher than that of the first electrode (1) and lower than that of the insulating layer (21). The resistance layer (22) and the liquid crystal layer (23) are disposed between the insulating layer (21) and the third electrode (3). The resistance layer (22) is disposed between the insulating layer (21) and the liquid crystal layer (23). The insulating layer (21) has a thickness (ts) smaller than a thickness (th) of the resistance layer (22).

公开(公告)号：US11899336B2

公开(公告)日：2024-02-13

申请号：US17604986

申请日：2020-04-17

Applicant: OSAKA UNIVERSITY

Inventor： Giichi Shibuya ,  Sunri Lee ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02F1/29 ,  G02B3/14

CPC classification number: G02F1/294 ,  G02B3/14

Abstract: A liquid crystal element is provided that can inhibit occurrence of voltage drop between one end and the other end of each electrode. A liquid crystal element (100) includes a liquid crystal layer LQ, a plurality of first arcuate electrodes (1), and a plurality of second arcuate electrodes (2). The first arcuate electrodes (1) are disposed concentrically about an optical axis (AX) of the liquid crystal element (100) and applies first voltage (V1) to the liquid crystal layer (LQ). The second arcuate electrodes (2) are disposed concentrically about the optical axis (AX) and applies second voltage (V2) to the liquid crystal layer (LQ).

公开(公告)号：US10761245B2

公开(公告)日：2020-09-01

申请号：US16318803

申请日：2017-07-11

Applicant: OSAKA UNIVERSITY

Inventor： Giichi Shibuya ,  Hiroyuki Yoshida ,  Masanori Ozaki

IPC: G02B3/08 ,  G02F1/1343 ,  G02B3/10 ,  G02F1/13 ,  G02C7/00 ,  G02F1/1333 ,  G02F1/1347 ,  G02F1/29 ,  G02F1/133 ,  G02C7/04 ,  G02F1/137

Abstract: A liquid crystal element (100) refracts and outputs light. The liquid crystal element (100) includes a first electrode (1), a second electrode (2), an insulating layer (21) that is an electric insulator, a resistance layer (22), a liquid crystal layer (23) including liquid crystal, and a third electrode (3). The insulating layer (21) is disposed between each location of the first and second electrodes (1) and (2) and the resistance layer (22) to insulate the first and second electrodes (1) and (2) from the resistance layer (22). The resistance layer (22) has an electrical resistivity higher than that of the first electrode (1) and lower than that of the insulating layer (21). The resistance layer (22) and the liquid crystal layer (23) are disposed between the insulating layer (21) and the third electrode (3). The resistance layer (22) is disposed between the insulating layer (21) and the liquid crystal layer (23). The insulating layer (21) has a thickness (ts) smaller than a thickness (th) of the resistance layer (22).

公开(公告)号：US10564336B2

公开(公告)日：2020-02-18

申请号：US15579158

申请日：2016-06-01

Applicant: OSAKA UNIVERSITY

Inventor： Hiroyuki Yoshida

IPC: G02B5/30 ,  G02F1/137 ,  G02B5/08 ,  G02B5/02 ,  G02B5/10 ,  F21V8/00 ,  G02F1/139 ,  G02F1/1335

Abstract: A liquid crystal element (1) includes helical structures (7). The liquid crystal element (1) has a light incidence surface (13) on which light is incident and a reflective surface (17) which reflects the light coming through the light incidence surface (13). Each helical structure (7) includes structure units (9). Each structure unit (9) includes liquid crystal molecules (11) stacked in a twisted manner to form a helix. A second end (E2) of one structure unit (9) of structure units (9) adjacent to one another in a first direction (A1) serves as a first end (E1) of the other structure unit (9). Directions of orientation of the liquid crystal molecules (11) at the first ends (E1) included in the helical structures (7) are identical. The reflective surface (17) includes at least one of the first ends (E1) included in each helical structure (7). The reflective surface (17) is non-parallel to the light incidence surface (13).