Patents by Inventor Masakazu Kaneoya

Masakazu Kaneoya 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: 10544365
    Abstract: A liquid crystal composition that has a positive dielectric anisotropy and a sufficiently low viscosity and that causes no display defects when used in liquid crystal display devices is provided without decreasing or increasing the refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature. This liquid crystal composition contains at least one compound selected from compounds represented by general formula (LC0) and at least one compound selected from the group consisting of compounds represented by general formulas (LC1) to (LC5). This liquid crystal composition can be used to provide a reliable liquid crystal display device capable of maintaining a high voltage-holding ratio at high temperatures. This liquid crystal display device is highly practical as a liquid crystal display and is effective in achieving quick response without significantly decreasing the cell gap.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: January 28, 2020
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Publication number: 20180079959
    Abstract: An object of the present invention is to provide a liquid crystal element which sufficiently optimizes mainly the electrooptical properties of a VA display, has a wide operating temperature range, a high-speed responsiveness at a low temperature, a halftone response speed, a high contrast, a wide viewing angle, a low threshold voltage, and a high resistance value, and includes a small amount of residual monomers and shows a high voltage holding ratio, even after polymerization of a polymerizable liquid crystal compound is performed. As a result of intensive studies to achieve the object described above, the inventors found the optimal configuration of a liquid crystal element and completed the present invention.
    Type: Application
    Filed: March 1, 2016
    Publication date: March 22, 2018
    Applicant: DIC Corporation
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Hidetoshi Nakata
  • Patent number: 9605208
    Abstract: A liquid crystal composition exhibits a positive dielectric anisotropy and sufficiently low viscosity without decreasing or increasing refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature, and does not cause display failures. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5), in which the liquid crystal composition contains one or more compounds in which at least one of A01, A02, and A11 to A42 in general formulae (LC0) to (LC4) represents a tetrahydropyran-2,5-diyl group.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 28, 2017
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Patent number: 9587175
    Abstract: The present invention relates to a nematic liquid crystal composition useful as an electro-optic liquid crystal display material and having a positive dielectric anisotropy (??). The liquid crystal composition has refractive index anisotropy (?n) adjusted to a desired level, a sufficiently low viscosity (?), and a positive dielectric anisotropy (??) while degradation of the temperature range of the nematic phase is avoided by suppressing the decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and the increase in lower limit temperature of the nematic phase. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5).
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 7, 2017
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Patent number: 9575363
    Abstract: In a liquid crystal display device 1 including a liquid crystal cell 2 having a liquid crystal layer, a first polarization plate 3 and a second polarization plate 4, and an optical compensation plate 5, when a differential coefficient of the amount of transmitted light I1 with respect to a time t when the driving voltage is turned off from on in a case in which the optical compensation plate 5 is not disposed is represented by ?I1/?t, and a differential coefficient of the amount of transmitted light I2 with respect to the time t when the driving voltage is turned off from on in a case in which the optical compensation plate 5 is disposed is represented by ?I2/?t, a phase difference in the liquid crystal layer and a phase difference in the optical compensation plate 5 are optically designed to satisfy a relationship of |?I2/?t|>|?I1/?t|.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: February 21, 2017
    Assignees: TOKYO UNIVERSITY OF SCIENCE FOUNDATION, DIC CORPORATION
    Inventors: Shunsuke Kobayashi, Kiyofumi Takeuchi, Masakazu Kaneoya
  • 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: 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
  • Patent number: 9404037
    Abstract: Provided is a liquid crystal display device of the VAIPS mode which uses a liquid crystal material having positive dielectric anisotropy and which has a fast response speed and excellent viewing angle characteristics without having a special cell structure such as pixel partitioning.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: August 2, 2016
    Assignee: DIC CORPORATION
    Inventors: Kiyofumi Takeuchi, Masakazu Kaneoya
  • Patent number: 9389462
    Abstract: Provided is a liquid crystal display device of VAIPS mode, which uses a liquid crystal material having negative dielectric anisotropy (??<0), and has a high response speed, a wide viewing angle, a high transmittance at the time of light transmission, a high black level at the time of light blockage, and an excellent contrast ratio.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 12, 2016
    Assignee: DIC CORPORATION
    Inventors: Kiyofumi Takeuchi, Masakazu Kaneoya
  • Publication number: 20160186059
    Abstract: A liquid crystal composition that has a positive dielectric anisotropy and a sufficiently low viscosity and that causes no display defects when used in liquid crystal display devices is provided without decreasing or increasing the refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature. This liquid crystal composition contains at least one compound selected from compounds represented by general formula (LC0) and at least one compound selected from the group consisting of compounds represented by general formulas (LC1) to (LC5). This liquid crystal composition can be used to provide a reliable liquid crystal display device capable of maintaining a high voltage-holding ratio at high temperatures. This liquid crystal display device is highly practical as a liquid crystal display and is effective in achieving quick response without significantly decreasing the cell gap.
    Type: Application
    Filed: August 21, 2014
    Publication date: June 30, 2016
    Applicant: DIC Corporation
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Publication number: 20160187698
    Abstract: In a liquid crystal display device 1 including a liquid crystal cell 2 having a liquid crystal layer, a first polarization plate 3 and a second polarization plate 4, and an optical compensation plate 5, when a differential coefficient of the amount of transmitted light I1 with respect to a time t when the driving voltage is turned off from on in a case in which the optical compensation plate 5 is not disposed is represented by ?I1/?t, and a differential coefficient of the amount of transmitted light I2 with respect to the time t when the driving voltage is turned off from on in a case in which the optical compensation plate 5 is disposed is represented by ?I2/?t, a phase difference in the liquid crystal layer and a phase difference in the optical compensation plate 5 are optically designed to satisfy a relationship of |?I2/?t|>|?I1/?t.
    Type: Application
    Filed: August 4, 2014
    Publication date: June 30, 2016
    Applicants: TOKYO UNIVERSITY OF SCIENCE FOUNDATION, DIC CORPORATION
    Inventors: Shunsuke Kobayashi, Kiyofumi Takeuchi, Masakazu Kaneoya
  • Patent number: 9321961
    Abstract: Provided is a liquid crystal composition having a positive dielectric anisotropy, the liquid crystal composition containing two or more compounds selected from compounds represented by general formula (LC0-1) to general formula (LC0-3), and one or more compounds selected from groups of compounds represented by general formula (LC1) to general formula (LC5). The liquid crystal composition has features of a large ?? and a low viscosity, and provides a practical, highly reliable liquid crystal display element that can realize low-voltage driving and high-speed response. The liquid crystal composition is useful for an active matrix driving liquid crystal display element. The liquid crystal composition can be applied to a liquid crystal display element of an IPS mode or the like.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: April 26, 2016
    Assignee: DIC CORPORATION (TOKYO)
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Publication number: 20150322343
    Abstract: Provided is a liquid crystal composition that has a positive dielectric anisotropy (??) and a refractive index anisotropy (?n) adjusted to a desired level, and sufficiently low viscosity (?) without degrading the nematic phase temperature range. The liquid crystal composition having positive dielectric anisotropy comprises one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from the group of compounds represented by general formula (LC1) to general formula (LC5), wherein the liquid crystal composition comprises a compound in which at least one of Y01 to Y41 in general formula (LC0) to general formula (LC4) represents a fluorinated C2-C5 alkyl, alkoxy, alkenyl, or alkenyloxy group.
    Type: Application
    Filed: September 5, 2013
    Publication date: November 12, 2015
    Applicant: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Patent number: 9181484
    Abstract: There is provided a compound having a good miscibility with another liquid crystal compound and having a combination of a low viscosity (?), high storage stability, and high T?i even after being used to produce a liquid crystal composition. In particular, it is a compound having a 2-fluorophenyloxymethane structure is provided. Since the compound having a 2-fluorophenyloxymethane structure is highly miscible with another liquid crystal compound, using the compound having a 2-fluorophenyloxymethane structure as a component of a liquid crystal composition enables a production of a liquid crystal composition which exhibits a liquid crystal phase at low viscosity and in a wide temperature range and which has a high storage stability and enables production of a liquid crystal display device which responds fast and which has excellent display characteristics.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: November 10, 2015
    Assignee: DIC CORPORATION
    Inventors: Kenta Tojo, Tetsuo Kusumoto, Masashi Osawa, Masakazu Kaneoya, Kiyofumi Takeuchi
  • 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: 20150284634
    Abstract: A liquid crystal composition having positive dielectric anisotropy and sufficiently low viscosity without decreasing refractive index anisotropy or increasing nematic phase-isotropic liquid phase transition temperature, and prevents display failures is provided. The liquid crystal composition comprises one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from the group of compounds represented by general formula (LC1) to general formula (LC5), wherein the liquid crystal composition comprises one or more compounds in which at least one of A21 to A42 in general formula (LC2) to general formula (LC4) represents a tetrahydropyran-2,5-diyl group.
    Type: Application
    Filed: September 5, 2013
    Publication date: October 8, 2015
    Applicant: DIC Corporation
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Patent number: 9120968
    Abstract: The present invention provides a liquid crystal display device that allows a reduction in a voltage holding ratio (VHR) of a liquid crystal layer and an increase in an ion density (ID) in the liquid crystal layer to be suppressed and thereby addresses issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display device according to the present invention, having a feature of suppressing the reduction in a voltage holding ratio (VHR) and the increase in an ion density (ID) in a liquid crystal layer and thereby suppressing occurrence of faulty display such as burn-in, is particularly useful as VA-mode and PSVA-mode liquid crystal display devices for active-matrix driving and may be used for liquid crystal display devices such as a liquid crystal TV, a monitor, a mobile phone, and a smart phone.
    Type: Grant
    Filed: July 18, 2013
    Date of Patent: September 1, 2015
    Assignee: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Kateuchi, Seiji Funakura, 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
  • Publication number: 20150218451
    Abstract: Provided is a liquid crystal composition having a positive dielectric anisotropy, the liquid crystal composition containing two or more compounds selected from compounds represented by general formula (LC0-1) to general formula (LC0-3), and one or more compounds selected from groups of compounds represented by general formula (LC1) to general formula (LC5). The liquid crystal composition has features of a large ?? and a low viscosity, and provides a practical, highly reliable liquid crystal display element that can realize low-voltage driving and high-speed response. The liquid crystal composition is useful for an active matrix driving liquid crystal display element. The liquid crystal composition can be applied to a liquid crystal display element of an IPS mode or the like.
    Type: Application
    Filed: August 29, 2013
    Publication date: August 6, 2015
    Applicant: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
  • Publication number: 20150203757
    Abstract: The present invention relates to a nematic liquid crystal composition useful as an electro-optic liquid crystal display material and having a positive dielectric anisotropy (??). The liquid crystal composition has refractive index anisotropy (?n) adjusted to a desired level, a sufficiently low viscosity (?), and a positive dielectric anisotropy (??) while degradation of the temperature range of the nematic phase is avoided by suppressing the decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and the increase in lower limit temperature of the nematic phase. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5).
    Type: Application
    Filed: July 24, 2013
    Publication date: July 23, 2015
    Applicant: DIC CORPORATION
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto