Patents by Inventor Yasuo Umezu

Yasuo Umezu 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: 20190393273
    Abstract: It is an object of the present invention to provide an image display apparatus capable of inhibiting or preventing the deterioration of a light conversion layer while high luminous efficiency and high color reproducibility are achieved. The present invention provides a light-emitting device including a pair of electrodes, an electroluminescent layer disposed between a first electrode and a second electrode, a light conversion layer including multiple pixels and converting light that is emitted from the electroluminescent layer and that has a blue emission spectrum into light having a different wavelength. The light conversion layer includes pixels of three primary colors of red (R), green (G), and blue (B) and contains a light-emitting nanocrystal having an emission spectrum in any of red (R), green (G), and blue (B) when light from the electroluminescent layer is incident on at least one of the three primary colors.
    Type: Application
    Filed: December 21, 2017
    Publication date: December 26, 2019
    Applicant: DIC Corporation
    Inventors: Yasuo Umezu, Hidehiko Yamaguchi, Yoshio Aoki, Shinji Ogawa
  • Publication number: 20190390076
    Abstract: A dispersion contains, as essential ingredients, light-emitting nanocrystals, a polymeric dispersant having an amine value of 5 mg/KOH g or more, and a stimulation-responsive curable material that cures in response to an external stimulus.
    Type: Application
    Filed: December 21, 2017
    Publication date: December 26, 2019
    Applicant: DIC Corporation
    Inventors: Takeshi Isonaka, Yasuo Umezu, Hidehiko Yamaguchi, Yoshio Aoki, Hirotomo Sasaki, Sunao Yoshihara, Takayuki Miki, Aya Ishizuka, Takeo Kizaki
  • Patent number: 10370734
    Abstract: A heating step, in which a stainless member is heated to a temperature within or above a heating phase-transformation temperature range (Ar) in which the stainless member is phase-transformed, is executed. A cooling step in which the stainless member heated in the heating step is cooled to a temperature below a cooling phase-transformation temperature range (Mr) in which the stainless member is phase-transformed, is executed. In the cooling step, cooling of the stainless member is suppressed in a control temperature range including the cooling phase-transformation temperature range (Mr).
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: August 6, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Kohei Hatano, Hiroharu Oyama, Yasuo Matsunami, Naoyuki Umezu, Shuhei Kuroki, Hidetaka Haraguchi, Takumi Matsumura, Motonari Machida
  • Patent number: 10301546
    Abstract: The liquid crystal display element uses a liquid crystal composition which has a negative value of dielectric anisotropy (??) and is designed to improve light transmittance adjusting an elastic constant, and a liquid crystal display including the liquid crystal display element. The liquid crystal display element uses a liquid crystal composition having a dielectric anisotropy (??) of less than ?1.5, in which a value of ? of the liquid crystal composition is 0.3 or less, and the value of ? is obtained from Equation (2) using measured values of a splay elastic constant (K11) and a bend elastic constant (K33) of the liquid crystal composition and a twist elastic constant (K22) value obtained from Equation (1) using measured values of a threshold voltage (Vth), a bend elastic constant (K33), vacuum permittivity (?0), a cell gap (d), and a helical pitch (P0).
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: May 28, 2019
    Assignee: DIC CORPORATION
    Inventors: Tsuyoshi Sasaki, Hidenari Akiyama, Yasuo Umezu, Kazunori Maruyama, Haruki Ohishi, Shinji Ogawa, Yoshinori Iwashita
  • Patent number: 10174254
    Abstract: The present invention relates to a liquid crystal composition, which is a liquid crystal composition containing a compound represented by General Formula (II-1) as an anti-oxidizing agent for a liquid crystal composition containing the compound represented by General Formula (II-1) and also as a first component, and a compound represented by General Formula (K) as a second component. The compound represented by General Formula (II-1) enables obtainment of a working effect of the anti-oxidizing agent, and therefore it allows provision of a liquid crystal composition containing the anti-oxidizing agent which has improved reliability like low temperature stability, while the high dielectric anisotropy is maintained.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: January 8, 2019
    Assignee: DIC CORPORATION
    Inventors: Go Sudo, Yasuo Umezu
  • Patent number: 10093857
    Abstract: There is provided a liquid crystal composition having the following properties without reductions in refractive index anisotropy (?n) and nematic phase-isotropic liquid phase transition temperature (Tni): sufficiently small viscosity (?), sufficiently small rotational viscosity (?1), a large elastic constant (K33), and negative dielectric anisotropy (??) with a large absolute value. There is also provided a liquid crystal display device of, for example, a VA type in which such a liquid crystal composition is used and which has a high response speed and excellent display quality with defective display being eliminated or reduced. The liquid crystal display device using the liquid crystal composition of the present invention is useful as an active-matrix liquid crystal display device and can be used in liquid crystal display devices of, for instance, a VA mode and PSVA mode.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: October 9, 2018
    Assignee: DIC CORPORATION
    Inventors: Shinichi Hirata, Hyobok Cha, Naomi Hatano, Tomoaki Hara, Yasuo Umezu
  • Publication number: 20180282623
    Abstract: The liquid crystal composition is designed to improve light transmittance using an elastic constant and has a negative value of dielectric anisotropy (??), a liquid crystal display element using the liquid crystal composition, and the liquid crystal display. The liquid crystal composition has a negative value of dielectric anisotropy (??) and a value of ? of 0.28 or less. The value of ? is obtained from Equation (2) using a twist elastic constant (K22) value obtained from Equation (1) using measured values of dielectric anisotropy (??), a threshold voltage (Vth), a bend elastic constant (K33), vacuum permittivity (?0), a cell gap (d), and a helical pitch (P0) and measured values of a splay elastic constant (K11) and the bend elastic constant (K33).
    Type: Application
    Filed: November 1, 2016
    Publication date: October 4, 2018
    Applicant: DIC Corporation
    Inventors: Tsuyoshi Sasaki, Hidenari Akiyama, Yasuo Umezu, Kazunori Maruyama, Haruki Ohishi, Shinji Ogawa, Yoshinori Iwashita
  • Publication number: 20180282626
    Abstract: The liquid crystal display element uses a liquid crystal composition which has a negative value of dielectric anisotropy (??) and is designed to improve light transmittance adjusting an elastic constant, and a liquid crystal display including the liquid crystal display element. The liquid crystal display element uses a liquid crystal composition having a dielectric anistropy (??) of less than ?1.5, in which a value of ? of the liquid crystal composition is 0.3 or less, and the value of ? is obtained from Equation (2) using measured values of a splay elastic constant (K11) and a bend elastic constant (K33) of the liquid crystal composition and a twist elastic constant (K22) value obtained from Equation (1) using measured values of a threshold voltage (Vth), a bend elastic constant (K33), vacuum permittivity (?0), a cell gap (d), and a helical pitch (P0).
    Type: Application
    Filed: October 20, 2016
    Publication date: October 4, 2018
    Applicant: DIC Corporation
    Inventors: Tsuyoshi Sasaki, Hidenari Akiyama, Yasuo Umezu, Kazunori Maruyama, Haruki Ohishi, Shinji Ogawa, Yoshinori Iwashita
  • Publication number: 20170029698
    Abstract: The present invention is to provide an antioxidant for liquid crystal composition which contains one or more kinds of liquid crystal compounds having a positive dielectric anisotropy of 4 or more as an absolute value at 3% or more and is represented by Formula (II-1) (in the Formula (II-1), My represents a hydrocarbon having from 1 to 25 carbon atoms, a 1,4-phenylene group, or a trans-1,4-cyclohexylene group, Xy represent an alkylene group having from 1 to 15 carbon atoms, —OCH2—, —CH2O—, —COO—, —OCO—, —CF2O—, —OCF2—, —CF2CF2—, —CH?CH—COO—, —CH?CH—OCO—, —COO—CH?CH—, —OCO—CH?CH—, —CH?CH—, —C?C—, a singlebond, a 1,4-phenylene group, or a trans-1,4-cyclohexylene group, and l represents an integer from 2 to 6), a liquid crystal composition containing the antioxidant, and a liquid crystal display device using the liquid crystal composition.
    Type: Application
    Filed: December 17, 2014
    Publication date: February 2, 2017
    Applicant: DIC Corporation
    Inventors: Go Sudo, Yasuo Umezu
  • Publication number: 20160319195
    Abstract: The present invention relates to a liquid crystal composition, which is a liquid crystal composition containing a compound represented by General Formula (II-1) as an anti-oxidizing agent for a liquid crystal composition containing the compound represented by General Formula (II-1) and also as a first component, and a compound represented by General Formula (K) as a second component. The compound represented by General Formula (II-1) enables obtainment of a working effect of the anti-oxidizing agent, and therefore it allows provision of a liquid crystal composition containing the anti-oxidizing agent which has improved reliability like low temperature stability, while the high dielectric anisotropy is maintained.
    Type: Application
    Filed: December 19, 2014
    Publication date: November 3, 2016
    Applicant: DIC Corporation
    Inventors: Go Sudo, Yasuo Umezu
  • Publication number: 20160319192
    Abstract: There is provided a liquid crystal composition whose refractive index anisotropy (?n) and nematic phase-isotropic liquid phase transition temperature (Tni) are sufficiently high, whose viscosity (?) is sufficiently low, whose rotational viscosity (?1) is sufficiently low, whose elastic constant (K33) is high, whose dielectric anisotropy (??) is high or whose ?? is negative with a large absolute value, and whose decrease in reliability after UV irradiation is small, and also provide a liquid crystal display element including the same, which has the excellent display quality and the high response speed.
    Type: Application
    Filed: December 17, 2014
    Publication date: November 3, 2016
    Applicant: DIC Corporation
    Inventors: Shinichi Hirata, Tomoaki Hara, Naomi Hatano, Yasuo Umezu
  • Publication number: 20160237349
    Abstract: There is provided a liquid crystal composition having the following properties without reductions in refractive index anisotropy (?n) and nematic phase-isotropic liquid phase transition temperature (Tni): sufficiently small viscosity (?), sufficiently small rotational viscosity (?1), a large elastic constant (K33), and negative dielectric anisotropy (??) with a large absolute value. There is also provided a liquid crystal display device of, for example, a VA type in which such a liquid crystal composition is used and which has a high response speed and excellent display quality with defective display being eliminated or reduced. The liquid crystal display device using the liquid crystal composition of the present invention is useful as an active-matrix liquid crystal display device and can be used in liquid crystal display devices of, for instance, a VA mode and PSVA mode.
    Type: Application
    Filed: March 27, 2014
    Publication date: August 18, 2016
    Applicant: DIC Corporation
    Inventors: Shinichi Hirata, Hyobok Cha, Naomi Hatano, Tomoaki Hara, Yasuo Umezu
  • Patent number: 7232592
    Abstract: The present invention provides a nematic liquid crystal composition using a 4,6-difluoroindane-based compound that has a low lower limit temperature (T?N) of the liquid crystal phase, high upper limit temperature (TN-I) of the liquid crystal phase, and wide liquid crystal phase temperature range without impairing response speed, threshold voltage and other liquid crystal characteristics within a the range of the optimal ?n as a nematic liquid crystal, and a 4,6-difluoroindane-based compound that is used in said liquid crystal composition. The nematic liquid crystal composition contains at least one type of compound having a 4,6-difluoroindan-2,5-diyl group, and the refractive index anisotropy is within the range of 0.08 to 0.15, the liquid crystal phase upper limit temperature is 70° C. or higher, the liquid crystal phase lower limit temperature is ?20° C. or lower, and the difference between the liquid crystal phase upper limit temperature and liquid crystal phase lower limit temperature is 90° C. or more.
    Type: Grant
    Filed: November 27, 2003
    Date of Patent: June 19, 2007
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Yasuo Umezu, Shotaro Kawakami, Kiyofumi Takeuchi, Tetsuo Kusumoto, Shinji Ogawa
  • Publication number: 20060102878
    Abstract: The present invention provides a nematic liquid crystal composition using a 4,6-difluoroindane-based compound that has a low lower limit temperature (T?N) of the liquid crystal phase, high upper limit temperature (TN-I) of the liquid crystal phase, and wide liquid crystal phase temperature range without impairing response speed, threshold voltage and other liquid crystal characteristics within a the range of the optimal ?n as a nematic liquid crystal, and a 4,6-difluoroindane-based compound that is used in said liquid crystal composition. The nematic liquid crystal composition contains at least one type of compound having a 4,6-difluoroindan-2,5-diyl group, and the refractive index anisotropy is within the range of 0.08 to 0.15, the liquid crystal phase upper limit temperature is 70° C. or higher, the liquid crystal phase lower limit temperature is ?20° C. or lower, and the difference between the liquid crystal phase upper limit temperature and liquid crystal phase lower limit temperature is 90° C. or more.
    Type: Application
    Filed: November 27, 2003
    Publication date: May 18, 2006
    Inventors: Yasuo Umezu, Shotaro Kawakami, Kiyofumi Takeuchi, Tetsuo Kusumoto, Shinji Ogawa
  • Patent number: 5327271
    Abstract: A liquid crystal device comprising a pair of substrates each having an electrode layer at least one of which is transparent, one or both of said substrates having formed thereon a network layer having a three-dimensional network structure which comprises a transparent solid substance, or one of said substrates having formed thereon said network layer with the other substrate having formed thereon an alignment layer, said pair of substrates being assembled in such a manner that said network layer of one substrate faces to the other network layer or the other substrate with or without an alignment layer in contact or with a small gap therebetween, and a liquid crystal material filled between said pair of substrates.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: July 5, 1994
    Assignee: Dainippon Ink and Chemical, Inc.
    Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Yasuo Umezu
  • Patent number: 5296952
    Abstract: A light scattering liquid crystal device having a double structure composed of (1) a first display panel of light scattering type which comprises a pair of transparent substrates each having a transparent electrode layer and a light controlling layer formed therebetween, said light controlling layer containing a liquid crystal material and a transparent solid substance and (2) a second display panel comprising a pair of transparent substrates each having an electrode layer and a liquid crystal material filled therebetween, selected from a guest-host type liquid crystal display panel containing a dichroic dye and a twisted or super-twisted nematic liquid crystal display panel having a pair of polarizers. The device achieves brightness and high contrast.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: March 22, 1994
    Assignee: Dainippon Ink & Chemicals Inc.
    Inventors: Haruyoshi Takatsu, Kiyofumi Takeuchi, Yasuo Umezu