Patents by Inventor Keumhee Jang

Keumhee Jang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11360342
    Abstract: The present invention relates to light-scattering liquid crystal devices suited for use in light control glass such as optical shutters and use in segment displays in, for example, clocks. A light-scattering liquid crystal device according to the present invention includes two substrates 1, of which at least one includes an electrode layer 2 and at least one is transparent, and a light control layer 4 held between the substrates, the light control layer 4 containing a liquid crystal material and a polymer substance, wherein the light-scattering liquid crystal device includes, between the substrates and the light control layer, a thin film layer 3 formed by subjecting a thermally curable compound containing a reactive group to thermal curing. According to the present invention, a light-scattering liquid crystal device having dramatically improved adhesion can be provided.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: June 14, 2022
    Assignee: DIC CORPORATION
    Inventors: Hidetoshi Nakata, Keumhee Jang, Kazunori Maruyama
  • Publication number: 20210223586
    Abstract: The present invention relates to light-scattering liquid crystal devices suited for use in light control glass such as optical shutters and use in segment displays in, for example, clocks. A light-scattering liquid crystal device according to the present invention includes two substrates 1, of which at least one includes an electrode layer 2 and at least one is transparent, and a light control layer 4 held between the substrates, the light control layer 4 containing a liquid crystal material and a polymer substance, wherein the light-scattering liquid crystal device includes, between the substrates and the light control layer, a thin film layer 3 formed by subjecting a thermally curable compound containing a reactive group to thermal curing. According to the present invention, a light-scattering liquid crystal device having dramatically improved adhesion can be provided.
    Type: Application
    Filed: July 23, 2019
    Publication date: July 22, 2021
    Applicant: DIC Corporation
    Inventors: Hidetoshi Nakata, Keumhee Jang, Kazunori Maruyama
  • Publication number: 20200071617
    Abstract: “Object” To provide a tilt-imparted liquid crystal display element that is obtained through UV irradiation of a polymerizable liquid crystal composition, whose drive voltage can be reduced with a fast decay time maintained, and that is well balanced between characteristics, such as decay time, drive voltage, and transmittance. A polymerizable liquid crystal composition for use in it is also provided. “Solution” A liquid crystal display element has polymer networks formed in the liquid crystal phase 5 in FIG. 3. The polymer networks are formed by polymerizing a polymerizable liquid crystal composition that contains, as essential ingredients, a radically polymerizable monomer component (A), a liquid crystal material (B), and a polymerization initiator (C) that has a molecular structure resulting from substituting any two or more hydrogen atoms in the aromatic nucleus in the molecular structure of an alkylphenone-based photopolymerization initiator, for example with a C1-10 alkyl group (i).
    Type: Application
    Filed: September 26, 2017
    Publication date: March 5, 2020
    Applicant: DIC Corporation
    Inventors: Toru Fujisawa, Masayuki Iwakubo, Hiroshi Hasebe, Fumiaki Kodera, Keumhee Jang
  • Patent number: 10133109
    Abstract: Provided is an LCD device having excellent high speed responsiveness. This LCD device contains a polymer or a copolymer in a liquid crystal composition sandwiched between two transparent substrates, at least one of which has an electrode, and the content of the polymer or the copolymer is 1% by mass or greater and less than 40% by mass of the total mass of the liquid crystal composition and the polymer or the copolymer. This LCD device can be applied to various operation modes such as TN, STN, ECB, VA, VA-TN, IPS, FFS, a ? cell, OCB, and cholesteric liquid crystals.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: November 20, 2018
    Assignee: DIC CORPORATION (TOKYO)
    Inventors: Toru Fujisawa, Go Sudo, Shuuhei Yamamoto, Kazunori Maruyama, Haruyoshi Takatsu, Marina Goto, Fumiaki Kodera, Keumhee Jang
  • Publication number: 20180307069
    Abstract: The liquid crystal display element includes: two transparent substrates; a liquid crystal composition sandwiched between the two transparent substrates and containing one or two or more liquid crystal compounds; and a polymer or copolymer that is included in the liquid crystal composition, the polymer or copolymer being a cured product of a polymerizable composition that contains one or two or more polymerizable compounds and a photopolymerization initiator having a maximum absorption wavelength peak at 310 nm to 380 nm. The content of the polymerizable composition is 1% by mass or more and less than 40% by mass based on the total weight of the polymerizable composition and the liquid crystal composition.
    Type: Application
    Filed: August 9, 2016
    Publication date: October 25, 2018
    Applicant: DIC Corporation
    Inventors: Fumiaki Kodera, Keumhee Jang, Toru Fujisawa, Hiroshi Hasebe, Haruyoshi Takatsu, Marina Goto, Go Sudo, Syuhei Yamamoto
  • Publication number: 20170045765
    Abstract: Provided is an LCD device having excellent high speed responsiveness. This LCD device contains a polymer or a copolymer in a liquid crystal composition sandwiched between two transparent substrates, at least one of which has an electrode, and the content of the polymer or the copolymer is 1% by mass or greater and less than 40% by mass of the total mass of the liquid crystal composition and the polymer or the copolymer. This LCD device can be applied to various operation modes such as TN, STN, ECB, VA, VA-TN, TPS, FFS, a ? cell, OCB, and cholesteric liquid crystals.
    Type: Application
    Filed: February 12, 2015
    Publication date: February 16, 2017
    Applicant: DIC Corporation
    Inventors: Toru Fujisawa, Go Sudo, Shuuhei Yamamoto, Kazunori Maruyama, Haruyoshi Takatsu, Marina Goto, Fumiaki Kodera, Keumhee Jang