公开(公告)号：US20200225542A1

公开(公告)日：2020-07-16

申请号：US16831374

申请日：2020-03-26

Applicant: The Hong Kong University of Science and Technology

Inventor： Chenxiang ZHAO ,  Man Chun TSENG ,  Cuiling MENG ,  Shu Tuen TANG ,  Hoi Sing KWOK

IPC: G02F1/1337 ,  C09K19/56 ,  C09K19/38 ,  C09D179/08 ,  C09K19/60

Abstract: Devices and methods relating to a vertical alignment layer with a preferred azimuthal angle for a liquid crystal device are provided. A method of preparation comprises preparing an alignment layer mixture of a polymeric vertical alignment material, an azo compound photo-aligned material, a reactive mesogen or liquid crystal monomer, a polyamic acid, a photo- or thermal-initiator, and an organic solvent, coating the alignment layer mixture onto a substrate, and irradiating the coated substrate with UV or blue light at an oblique angle.

公开(公告)号：US20210011343A1

公开(公告)日：2021-01-14

申请号：US17028464

申请日：2020-09-22

Applicant: The Hong Kong University of Science and Technology

Inventor： Man Chun TSENG ,  Abhishek Kumar SRIVASTAVA ,  Cuiling MENG ,  Vladimir Grigorievich CHIGRINOV ,  Hoi Sing KWOK ,  Yue SHI ,  Yeuk Lung Jacob HO ,  Chenxiang ZHAO

IPC: G02F1/1337

Abstract: A composite photoalignment layer for aligning liquid crystal molecules includes: a monomeric material; a photoinitiator or a thermal initiator; and an azo dye material. A method for preparing a composite photoalignment layer for aligning liquid crystal molecules includes: mixing, in solution form, a monomeric material, a photoinitiator or a thermal initiator, and an azo dye material; coating the mixed solution onto a substrate to form a thin film; exposing the thin film to polarized light; and, with a thermal initiator, heating the thin film to polymerize the monomeric material and form a solid thin film.

公开(公告)号：US20230295438A1

公开(公告)日：2023-09-21

申请号：US17694707

申请日：2022-03-15

Applicant: The Hong Kong University of Science and Technology

Inventor： Valerii Vladimirovich VASHCHENKO ,  Olena VASHCHENKO ,  Hoi Sing KWOK ,  Cuiling MENG ,  Yeuk Lung HO

IPC: C09B39/00 ,  G02B1/08 ,  G02B5/30

CPC classification number: C09B39/00 ,  G02B1/08 ,  G02B5/305

Abstract: A dichroic bis-azo biphenyl dye of the following formula:




The substituents R1, R2, R3, R4 are alkyl (CnH2n+1) or alkenyl (CnH2n−1) groups with n=1-18. At least one substituent among R1R2R3R4 is different from the other substituents. A benzidine-free method of making a dichroic bis-azo biphenyl dye is provided in which the biphenyl portion of the dye is formed from different first and second mono-azo dyes by a cross-coupling reaction, which may be a Suzuki reaction. A polarizer is formed from a photoaligned layer of the bis-azo biphenyl dye on a substrate and exhibits a dichroic ratio of at least 40. Chemical modification of the photoaligned bis-azo biphenyl dye layer creates a broad-band thin film polarizer with low light scattering and high thermal and photo tolerances.

公开(公告)号：US20180039141A1

公开(公告)日：2018-02-08

申请号：US15785723

申请日：2017-10-17

Applicant: The Hong Kong University of Science and Technology

Inventor： Man Chun TSENG ,  Abhishek Kumar SRIVASTAVA ,  Cuiling MENG ,  Vladimir Grigorievich CHIGRINOV ,  Hoi Sing KWOK ,  Yue SHI ,  Yeuk Lung Jacob HO ,  Chenxiang ZHAO

IPC: G02F1/1337

Abstract: A composite photoalignment layer for aligning liquid crystal molecules includes: a monomeric material; a photoinitiator or a thermal initiator; and an azo dye material. A method for preparing a composite photoalignment layer for aligning liquid crystal molecules includes: mixing, in solution form, a monomeric material, a photoinitiator or a thermal initiator, and an azo dye material; coating the mixed solution onto a substrate to form a thin film; exposing the thin film to polarized light; and, with a thermal initiator, heating the thin film to polymerize the monomeric material and form a solid thin film.