Patents by Inventor Isao Oshiumi

Isao Oshiumi 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: 9593280
    Abstract: There is provided a liquid crystal display device that may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby address issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display device according to the present invention, which may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby reduce the risk of faulty display such as burn-in, can be suitably used, in particular, as an IPS-mode or FFS-mode liquid crystal display device for active-matrix driving and may also be used as a liquid crystal display device for liquid crystal display televisions, monitors, mobile phones, smart phones, or the like.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: March 14, 2017
    Assignee: DIC CORPORATION
    Inventors: Takeshi Kuriyama, Jouji Kawamura, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Patent number: 9487700
    Abstract: The present invention relates to a liquid crystal display device that uses a particular liquid crystal composition and a color filter that uses a particular pigment. The present invention provides a liquid crystal display device that prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) of a liquid crystal layer and resolves the problems of display defects, such as missing dots, alignment variation, and ghosting. Since the liquid crystal display device of the present invention prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) of a liquid crystal layer and resolves the problems of display defects, such as ghosting, it is particularly useful for active matrix drive VA-mode and PSVA-mode liquid crystal display devices and can be applied to liquid crystal display devices such as liquid crystal televisions, monitors, cellular phones, and smart phones.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: November 8, 2016
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Patent number: 9441158
    Abstract: The present invention provides a liquid crystal display device which prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and which overcomes problems of defective display such as dropouts, uneven alignment, and screen burn-in. The liquid crystal display device of the present invention prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and reduces defective display such as screen burn-in; hence, such a liquid crystal display device is properly used as liquid crystal display devices of a VA mode and PSVA mode which involve active matrix driving and can be applied to liquid crystal display devices of liquid crystal TV sets, monitors, mobile phones, and smartphones.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: September 13, 2016
    Assignee: DIC CORPORATION
    Inventors: Shinji Ogawa, Yoshinori Iwashita, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Patent number: 9442321
    Abstract: There is provided a liquid crystal display apparatus that may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and limit an increase in the ion density (ID) in the liquid crystal layer and address issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display apparatus includes a first substrate, a second substrate, a liquid crystal composition layer held between the first substrate and the second substrate, a color filter including a black matrix and at least RGB three-color pixel portions, a pixel electrode, and a common electrode. The liquid crystal composition layer is composed of a liquid crystal composition including one or more compounds represented by General Formula (LC1).
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: September 13, 2016
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Publication number: 20160152893
    Abstract: The present invention provides a liquid crystal display device which prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and which overcomes problems of defective display such as dropouts, uneven alignment, and screen burn-in. The liquid crystal display device of the present invention prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and reduces defective display such as screen burn-in; hence, such a liquid crystal display device is properly used as liquid crystal display devices of a VA mode and PSVA mode which involve active matrix driving and can be applied to liquid crystal display devices of liquid crystal TV sets, monitors, mobile phones, and smartphones.
    Type: Application
    Filed: May 23, 2013
    Publication date: June 2, 2016
    Applicant: DIC CORPORATION
    Inventors: Shinji Ogawa, Yoshinori Iwashita, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Publication number: 20150344778
    Abstract: There is provided a liquid crystal display device that may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby address issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display device according to the present invention, which may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby reduce the risk of faulty display such as burn-in, can be suitably used, in particular, as an IPS-mode or FFS-mode liquid crystal display device for active-matrix driving and may also be used as a liquid crystal display device for liquid crystal display televisions, monitors, mobile phones, smart phones, or the like.
    Type: Application
    Filed: June 18, 2013
    Publication date: December 3, 2015
    Applicant: DIC Corporation
    Inventors: Takeshi Kuriyama, Jouji Kawamura, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Publication number: 20150309361
    Abstract: There is provided a liquid crystal display apparatus that may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and limit an increase in the ion density (ID) in the liquid crystal layer and address issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. Having a feature of limiting a reduction in the VHR of a liquid crystal layer and limiting an increase in an ion density (ID) in the liquid crystal layer and thereby reducing occurrence of faulty display such as burn-in, the liquid crystal display apparatus according to the present invention may be particularly suitably used as a VA-mode or PSVA-mode liquid crystal display apparatus for active-matrix driving and may be used as a liquid crystal display apparatus included in a liquid crystal TV, a monitor, a mobile phone, a smart phone, or the like.
    Type: Application
    Filed: November 26, 2013
    Publication date: October 29, 2015
    Applicant: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Publication number: 20150232757
    Abstract: The present invention relates to a liquid crystal display device that uses a particular liquid crystal composition and a color filter that uses a particular pigment. The present invention provides a liquid crystal display device that prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) of a liquid crystal layer and resolves the problems of display defects, such as missing dots, alignment variation, and ghosting. Since the liquid crystal display device of the present invention prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) of a liquid crystal layer and resolves the problems of display defects, such as ghosting, it is particularly useful for active matrix drive VA-mode and PSVA-mode liquid crystal display devices and can be applied to liquid crystal display devices such as liquid crystal televisions, monitors, cellular phones, and smart phones.
    Type: Application
    Filed: August 22, 2013
    Publication date: August 20, 2015
    Applicant: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Seiji Funakura, Isao Oshiumi, Katsunori Shimada
  • Patent number: 5788759
    Abstract: A .delta.-indanthrone blue pigment having an average primary particle diameter in the range of 0.5 .mu.m or less and having a chroma C* value of 20 or greater; a hue angle in the range of 274-283 when colorimetry is performed on a paint film made from a melamine alkyd paint in which the proportion of pigment in the solid portion is 9.6%; and containing .delta.-indanthrone blue pigment and titanium dioxide pigment in a ratio of 1 to 20 by weight.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: August 4, 1998
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Nagayuki Takao, Isao Oshiumi, Kiyomi Kitami