Patents by Inventor Keisuke Izawa

Keisuke Izawa 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).

  • Publication number: 20220019102
    Abstract: A liquid crystal display panel to be used in a vertical orientation includes: a first substrate; a second substrate located opposite to the first substrate; and a liquid crystal layer disposed between the first substrate and the second substrate. When a position of a top end of the liquid crystal layer is defined as a first position and a position of a bottom end of the liquid crystal layer is defined as a second position when the liquid crystal display panel is placed in the vertical orientation, a distance between the first substrate and the second substrate when the liquid crystal panel is in a horizontal orientation gradually decreases from the first position to the second position.
    Type: Application
    Filed: July 13, 2021
    Publication date: January 20, 2022
    Inventors: Keisuke IZAWA, Makoto ARITA, Toshitaka UCHIKOBA
  • Publication number: 20220019100
    Abstract: A method of setting a common electrode voltage of a liquid crystal display panel in a liquid crystal module is provided. The liquid crystal module includes the liquid crystal display panel including an alignment film, and a backlight disposed behind the liquid crystal display panel. The method of setting a common electrode voltage of a liquid crystal display panel includes: eliminating an electric charge of the alignment film by turning on the backlight without driving the liquid crystal display panel to emit light of the backlight onto the liquid crystal display panel; and setting the common electrode voltage of the liquid crystal display panel by adjusting the common electrode voltage, after the eliminating of the electric charge.
    Type: Application
    Filed: July 13, 2021
    Publication date: January 20, 2022
    Inventors: Keisuke IZAWA, Makoto ARITA, Toshitaka UCHIKOBA
  • Publication number: 20180127655
    Abstract: A photo-aligning liquid crystal aligning agent for forming a liquid crystal alignment layer capable of materializing a liquid crystal display device, which has a high transmittance while maintaining a liquid crystal aligning property, a voltage holding ratio and the like, and in which flickering is inhibited from being caused after operating for a long time. The photo-aligning liquid crystal aligning agent contains [A] polyamic acid or a derivative thereof which is synthesized by reacting tetracarboxylic acid dianhydride and diamine, and [B] polyamic acid or a derivative thereof obtained by reacting tetracarboxylic acid dianhydride having no photoreactive structure and diamine having no photoreactive structure.
    Type: Application
    Filed: January 9, 2018
    Publication date: May 10, 2018
    Applicants: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Youichiro Ooki, Yuko Katano, Tomoyuki Matsuda, Keisuke Izawa, Rika Hisada
  • Patent number: 9909065
    Abstract: A photo-aligning liquid crystal aligning agent for forming a liquid crystal alignment layer capable of materializing a liquid crystal display device, which has a high transmittance while maintaining a liquid crystal aligning property, a voltage holding ratio and the like, and in which flickering is inhibited from being caused after operating for a long time. The photo-aligning liquid crystal aligning agent contains [A] polyamic acid or a derivative thereof which is synthesized by reacting tetracarboxylic acid dianhydride and diamine, and [B] polyamic acid or a derivative thereof obtained by reacting tetracarboxylic acid dianhydride having no photoreactive structure and diamine having no photoreactive structure.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: March 6, 2018
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Youichiro Ooki, Yuko Katano, Tomoyuki Matsuda, Keisuke Izawa, Rika Hisada
  • Publication number: 20170327744
    Abstract: A photo-aligning liquid crystal alignment layer formed by using a photo-aligning liquid crystal aligning agent containing polyamic acid or a derivative thereof which is synthesized by using tetracarboxylic acid dianhydride having no photoreactive structure having a specific structure and diamine having no photoreactive structure having a specific structure together with at least one of tetracarboxylic acid dianhydride having a photoreactive structure and diamine having a photoreactive structure can reduce storage of residual DC in a liquid crystal display device. Further, the above alignment layer can shorten the relaxation time and can prevent afterimages from being generated.
    Type: Application
    Filed: July 31, 2017
    Publication date: November 16, 2017
    Inventors: Youichiro OOKI, Yuko KATANO, Tomoyuki MATSUDA, Keisuke IZAWA, Rika HISADA
  • Publication number: 20170327743
    Abstract: The present invention relates to a liquid crystal display element including a pair of a substrate arranged opposite to each other, an electrode group disposed on one side or both sides of the pair of substrates facing each other, a plurality of active elements connected to the electrode group, a liquid crystal alignment film disposed on each facing side of the pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain or a film being subject to heat-baking so as to provide alignment-controlling capability, and the liquid crystal layer is a liquid crystal composition having negative (?) dielectric anisotropy. By the present invention, a liquid crystal display element having improved image sticking characteristics and good alignment stability is provided.
    Type: Application
    Filed: August 2, 2017
    Publication date: November 16, 2017
    Inventors: Yuko KATANO, Yukio HIRANO, Keisuke IZAWA, Fumitaka KONDO
  • Patent number: 9796927
    Abstract: A photo-aligning liquid crystal alignment layer formed by using a photo-aligning liquid crystal aligning agent containing polyamic acid or a derivative thereof which is synthesized by using tetracarboxylic acid dianhydride having no photoreactive structure having a specific structure and diamine having no photoreactive structure having a specific structure together with at least one of tetracarboxylic acid dianhydride having a photoreactive structure and diamine having a photoreactive structure can reduce storage of residual DC in a liquid crystal display device. Further, the above alignment layer can shorten the relaxation time and can prevent afterimages from being generated.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: October 24, 2017
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Youichiro Ooki, Yuko Katano, Tomoyuki Matsuda, Keisuke Izawa, Rika Hisada
  • Patent number: 9771519
    Abstract: The present invention relates to a liquid crystal display device including a pair of a substrate arranged opposite to each other, an electrode group disposed on one side or both sides of the pair of substrates facing each other, a plurality of active devices connected to the electrode group, a liquid crystal alignment film disposed on each facing side of the pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain or a film being subject to heat-baking so as to provide alignment-controlling capability, and the liquid crystal layer is a liquid crystal composition having negative (?) dielectric anisotropy. By the present invention, a liquid crystal display device having improved image sticking characteristics and good alignment stability is provided.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: September 26, 2017
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yuko Katano, Yukio Hirano, Keisuke Izawa, Fumitaka Kondo
  • Publication number: 20150275089
    Abstract: The present invention relates to a liquid crystal display device including a pair of a substrate arranged opposite to each other, an electrode group disposed on one side or both sides of the pair of substrates facing each other, a plurality of active devices connected to the electrode group, a liquid crystal alignment film disposed on each facing side of the pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain or a film being subject to heat-baking so as to provide alignment-controlling capability, and the liquid crystal layer is a liquid crystal composition having negative (?) dielectric anisotropy. By the present invention, a liquid crystal display device having improved image sticking characteristics and good alignment stability is provided.
    Type: Application
    Filed: October 31, 2013
    Publication date: October 1, 2015
    Inventors: Yuko Katano, Yukio Hirano, Keisuke Izawa, Fumitaka Kondo
  • Publication number: 20150119522
    Abstract: An object of the present invention is to provide a photo-aligning liquid crystal aligning agent for forming a liquid crystal alignment layer capable of materializing a liquid crystal display device which has a high transmittance while maintaining a liquid crystal aligning property, a voltage holding ratio and the like and in which flickering is inhibited from being caused after operated for a long time.
    Type: Application
    Filed: April 10, 2013
    Publication date: April 30, 2015
    Inventors: Youichiro Ooki, Yuko Katano, Tomoyuki Matsuda, Keisuke Izawa, Rika Hisada
  • Publication number: 20150105503
    Abstract: A photo-aligning liquid crystal alignment layer formed by using a photo-aligning liquid crystal aligning agent containing polyamic acid or a derivative thereof which is synthesized by using tetracarboxylic acid dianhydride having no photoreactive structure having a specific structure and diamine having no photoreactive structure having a specific structure together with at least one of tetracarboxylic acid dianhydride having a photoreactive structure and diamine having a photoreactive structure can reduce storage of residual DC in a liquid crystal display device. Further, the above alignment layer can shorten the relaxation time and can prevent afterimages from being generated.
    Type: Application
    Filed: April 10, 2013
    Publication date: April 16, 2015
    Inventors: Youichiro Ooki, Yuko Katano, Tomoyuki Matsuda, Keisuke Izawa, Rika Hisada