Patents by Inventor Shotaro Kawakami

Shotaro Kawakami 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: 20150152331
    Abstract: The present invention provides a nematic liquid crystal composition having a negative dielectric anisotropy with an absolute value from 2 to 8 at 25° C., the composition containing at least one liquid crystal compound having a negative dielectric anisotropy with an absolute value of 4 or more and at least one antioxidant, wherein the amount of the liquid crystal compound is not less than 3%; the present invention also provides a liquid crystal display device using such a liquid crystal composition.
    Type: Application
    Filed: June 10, 2013
    Publication date: June 4, 2015
    Applicant: DIC CORPORATION
    Inventors: Shotaro Kawakami, Go Sudo
  • Publication number: 20150123032
    Abstract: The present invention provides a liquid crystal composition having a sufficiently low viscosity (?), a sufficiently low rotational viscosity (?1), a high elastic constant (K33), and a negative dielectric anisotropy (??) with a high absolute value without decreasing the refractive index anisotropy (?n) and the nematic phase-isotropic liquid phase transition temperature (TNi); and a liquid crystal display device with a VA mode or the like that uses the liquid crystal composition and has high display quality and high response speed. The liquid crystal display device that uses the liquid crystal composition of the present invention has a distinguished feature of high-speed response and is particularly useful as an active matrix driving liquid crystal display device. The liquid crystal display device is applicable to a VA mode, PSVA mode, PSA mode, IPS mode, or ECB mode liquid crystal display device.
    Type: Application
    Filed: June 26, 2013
    Publication date: May 7, 2015
    Applicant: DIC CORPORATION
    Inventors: Go Sudo, Shotaro Kawakami
  • Patent number: 9023439
    Abstract: A nematic liquid crystal composition according to the invention is used for a liquid crystal display element for an active matrix drive for TV applications or the like for which a quick switching and a wide viewing angle are required. The liquid crystal composition has a negative dielectric anisotropy having a large absolute value and also has a sufficiently low viscosity. Therefore, the liquid crystal composition has excellent characteristic properties, that is, a quick switching, good display quality and a suppressed display defect, and is therefore suitable as a practical liquid crystal composition. Further, a liquid crystal display element produced using the liquid crystal composition can be used favorably as a liquid crystal display element of a VA type or the like.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: May 5, 2015
    Assignee: DIC Corporation
    Inventors: Gou Sudou, Shotaro Kawakami
  • Publication number: 20150069296
    Abstract: A liquid crystal composition of the present invention is used for a liquid crystal display device of an active matrix driving method, which requires fast response. The liquid crystal composition has negative dielectric anisotropy and a large absolute value thereof, and low viscosity. The liquid crystal composition is chemically stable to heat, light, water, and the like, and is suitable as a liquid crystal composition capable of low-voltage driving and practicable and having high reliability. A liquid crystal display device using the liquid crystal composition can be preferably used for a liquid crystal display device of a VA mode, a PASV mode, a PSA mode, or the like.
    Type: Application
    Filed: December 18, 2012
    Publication date: March 12, 2015
    Applicant: DIC Corporation
    Inventors: Takeshi Kuriyama, Go Sudo, Shinichi Hirata, Shotaro Kawakami
  • Publication number: 20150034873
    Abstract: A nematic liquid crystal composition according to the invention is used for a liquid crystal display element for an active matrix drive for TV applications or the like for which a high speed and a wide viewing angle are required. The liquid crystal composition has a negative dielectric anisotropy having a large absolute value and also has a sufficiently low viscosity. Therefore, the liquid crystal composition has excellent characteristic properties, that is, a high speed response, good display quality and a suppressed display defect, and is therefore suitable as a practical liquid crystal composition. Further, a liquid crystal display element produced using the liquid crystal composition can be used favorably as a liquid crystal display element of a VA type or the like.
    Type: Application
    Filed: October 17, 2014
    Publication date: February 5, 2015
    Applicant: DIC CORPORATION
    Inventors: Go Sudo, Shotaro Kawakami
  • Publication number: 20140293213
    Abstract: A liquid crystal composition containing a polymerizable compound of the present invention has excellent characteristics of being able to prepare a PSA type liquid crystal display element with no problem of depositing in a wide temperature range, having high polymerization speed, high liquid crystal alignment regulation force after polymerization, excellent display qualities with no display unevenness or the like, and excellent display characteristics with no defects in display characteristics such as image sticking and is appropriate as a liquid crystal composition in a practical use. Further, the liquid crystal display element with the above-described liquid crystal composition can be appropriately used for a PSA type liquid crystal display element.
    Type: Application
    Filed: August 10, 2012
    Publication date: October 2, 2014
    Applicant: DIC CORPORATION
    Inventors: Kazuki Kurisawa, Takeshi Kuriyama, Shotaro Kawakami
  • Publication number: 20140239226
    Abstract: A liquid crystal composition of the present invention is used for a liquid crystal display device of an active matrix driving mode which is required to have fast response. The liquid crystal composition has negative dielectric anisotropy, a large absolute value thereof, and low viscosity. Also, the liquid crystal composition has excellent liquid crystallinity that does not decrease ?n and Tni, and the like, and exhibits a stable liquid crystal phase within a wide temperature range. Further, the liquid crystal composition is chemically stable to heat, light, water, and the like and is thus suitable for use in a liquid crystal display device in which display defects are suppressed in large-size application requiring high reliability. A liquid crystal display device using the liquid crystal composition can be suitably used as a liquid crystal display device of a VA mode or the like.
    Type: Application
    Filed: September 21, 2012
    Publication date: August 28, 2014
    Applicant: DIC CORPORATION
    Inventors: Go Sudo, Shotaro Kawakami
  • Patent number: 8765013
    Abstract: A polymerizable compound-containing liquid crystal composition includes at least one of compounds represented by general formulae (I) to (IV). A liquid crystal display device uses the liquid crystal composition.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: July 1, 2014
    Assignee: DIC Corporation
    Inventors: Kazuki Kurisawa, Takeshi Kuriyama, Shotaro Kawakami
  • Publication number: 20140070142
    Abstract: A nematic liquid crystal composition according to the invention is used for a liquid crystal display element for an active matrix drive for TV applications or the like for which a quick switching and a wide viewing angle are required. The liquid crystal composition has a negative dielectric anisotropy having a large absolute value and also has a sufficiently low viscosity. Therefore, the liquid crystal composition has excellent characteristic properties, that is, a quick switching, good display quality and a suppressed display defect, and is therefore suitable as a practical liquid crystal composition. Further, a liquid crystal display element produced using the liquid crystal composition can be used favorably as a liquid crystal display element of a VA type or the like.
    Type: Application
    Filed: April 4, 2012
    Publication date: March 13, 2014
    Applicant: DIC CORPORATION
    Inventors: Gou Sudo, Shotaro Kawakami
  • Patent number: 8647530
    Abstract: A liquid crystal composition containing a polymerizable compound contains one or two or more polymerizable compounds having the general formula (I) as a first component and one or two or more non-polymerizable liquid crystal compounds having an alkenyl group as a second component. A liquid crystal display element is manufactured using the liquid crystal composition.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: February 11, 2014
    Assignee: DIC Corporation
    Inventors: Takeshi Kuriyama, Kazuki Kurisawa, Shotaro Kawakami
  • Publication number: 20130334462
    Abstract: A polymerizable compound-containing liquid crystal composition of the present invention relates to a liquid crystal composition containing a polymerizable compound represented by general formula (I) and a compound represented by general formula (II) and can be used for a liquid crystal display device imparted with liquid crystal aligning ability by polymerization. The polymerizable liquid crystal composition is required to cause no precipitation in a wide temperature range and have a low viscosity corresponding to fast switching, and a liquid crystal display device using the composition is required to have more stable alignment after polymerization and to cause no defect in display characteristics. In the present invention, the problems can be solved using a specified compound.
    Type: Application
    Filed: November 15, 2011
    Publication date: December 19, 2013
    Applicant: DIC CORPORATION
    Inventors: Go Sudo, Shotaro Kawakami
  • Patent number: 8603358
    Abstract: A liquid crystal composition containing a polymerizable compound according to the present invention is used in a liquid crystal display element to which a liquid crystal alignment capability is provided by polymerization. The composition contains a polymerizable compound that polymerizes without a photopolymerization initiator or with only an extremely small amount of photopolymerization initiator. Therefore, the alignment after the polymerization becomes more stable and the display characteristics do not degrade. Thus, the polymerizable compound is suitable as a practical component of the liquid crystal composition. A liquid crystal display element that uses the liquid crystal composition containing a polymerizable compound according to the present invention can be suitably used for VA and IPS liquid crystal display elements.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: December 10, 2013
    Assignee: DIC Corporation
    Inventors: Takeshi Kuriyama, Shinichi Hirata, Shotaro Kawakami
  • Patent number: 8460576
    Abstract: Provided are a liquid crystal composition containing, as a first component, a polymerizable compound represented by general formula (I): and a liquid crystal display element using the liquid crystal composition.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: June 11, 2013
    Assignee: DIC Corporation
    Inventors: Kazuki Kurisawa, Takeshi Kuriyama, Shotaro Kawakami
  • Patent number: 8440101
    Abstract: Provided are a liquid crystal composition containing, as a first component, a polymerizable compound represented by general formula (I): R11—S11-L11-(M11-L12)m-M12-L13-(M13-L14)n-Z11??(I) and a liquid crystal display element using the liquid crystal composition.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: May 14, 2013
    Assignee: DIC Corporation
    Inventors: Takeshi Kuriyama, Shinichi Hirata, Shotaro Kawakami
  • Patent number: 8425800
    Abstract: Provided are a liquid crystal composition containing, as a first component, a polymerizable compound represented by general formula (I): (Z11)m11-M11-(L11-M12)n11-COO-(M13-L12)n12-M14-(Z12)m12??(I) and a liquid crystal display element using the liquid crystal composition.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: April 23, 2013
    Assignee: DIC Corporation
    Inventors: Shinichi Hirata, Takeshi Kuriyama, Shotaro Kawakami
  • Publication number: 20120292568
    Abstract: A liquid crystal composition containing a polymerizable compound contains one or two or more polymerizable compounds having the general formula (I) as a first component and one or two or more non-polymerizable liquid crystal compounds having an alkenyl group as a second component. A liquid crystal display element is manufactured using the liquid crystal composition.
    Type: Application
    Filed: May 18, 2012
    Publication date: November 22, 2012
    Applicant: DIC CORPORATION
    Inventors: Takeshi Kuriyama, Kazuki Kurisawa, Shotaro Kawakami
  • Publication number: 20120292569
    Abstract: A polymerizable compound-containing liquid crystal composition includes at least one of compounds represented by general formulae (I) to (IV). A liquid crystal display device uses the liquid crystal composition.
    Type: Application
    Filed: May 18, 2012
    Publication date: November 22, 2012
    Applicant: DIC CORPORATION
    Inventors: Kazuki Kurisawa, Takeshi Kuriyama, Shotaro Kawakami
  • Publication number: 20120097895
    Abstract: A liquid crystal composition containing a polymerizable compound according to the present invention is used in a liquid crystal display element to which a liquid crystal alignment capability is provided by polymerization. The composition contains a polymerizable compound that polymerizes without a photopolymerization initiator or with only an extremely small amount of photopolymerization initiator. Therefore, the alignment after the polymerization becomes more stable and the display characteristics do not degrade. Thus, the polymerizable compound is suitable as a practical component of the liquid crystal composition. A liquid crystal display element that uses the liquid crystal composition containing a polymerizable compound according to the present invention can be suitably used for VA and IPS liquid crystal display elements.
    Type: Application
    Filed: April 1, 2010
    Publication date: April 26, 2012
    Applicant: DIC Corporation
    Inventors: Takeshi Kuriyama, Shinichi Hirata, Shotaro Kawakami
  • Publication number: 20110253936
    Abstract: Provided are a liquid crystal composition containing, as a first component, a polymerizable compound represented by general formula (I): and a liquid crystal display element using the liquid crystal composition.
    Type: Application
    Filed: April 15, 2011
    Publication date: October 20, 2011
    Applicant: DIC Corporation
    Inventors: Kazuki KURISAWA, Takeshi KURIYAMA, Shotaro KAWAKAMI
  • Publication number: 20110253933
    Abstract: Provided are a liquid crystal composition containing, as a first component, a polymerizable compound represented by general formula (I): (Z11)m11-M11-(L11-M12)n11-COO-(M13-L12)n12-M14-(Z12)m12 ??(I) and a liquid crystal display element using the liquid crystal composition.
    Type: Application
    Filed: April 15, 2011
    Publication date: October 20, 2011
    Applicant: DIC Corporation
    Inventors: Shinichi Hirata, Takeshi Kuriyama, Shotaro Kawakami