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).
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Patent number: 8003006Abstract: A nematic liquid crystal composition of the present invention includes one or at least two compounds represented by general formula (I) as a first component; and one or at least two compounds represented by general formula (II) as a second component, wherein a dielectric anisotropy is negative. The use of this nematic liquid crystal composition can provide a highly reliable liquid crystal display element capable of maintaining a high voltage-holding ratio even in a high temperature region, and achieving quick responsiveness without reducing the cell gap.Type: GrantFiled: March 15, 2006Date of Patent: August 23, 2011Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto
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Publication number: 20110186776Abstract: 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: ApplicationFiled: January 31, 2011Publication date: August 4, 2011Applicant: DIC CorporationInventors: Takeshi Kuriyama, Shinichi Hirata, Shotaro Kawakami
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Patent number: 7670504Abstract: The present invention provides a liquid crystal composition having a negative dielectric anisotropy whose absolute value is large, and a low viscosity, and also provides a VA type liquid crystal element using the same. Disclosed is a liquid crystal composition containing a compound represented by the general formula (I) and an alkenyl compound represented by the general formula (II): By combining the liquid compounds according to the present invention, a liquid crystal composition having a low viscosity and a negative dielectric anisotropy could be obtained while nearly maintaining physical properties such as refractive anisotropy. By using the composition, a liquid crystal element having excellent reliability, capable of maintaining a high voltage retention until a high temperature region, is provided, and the display is very applicable as a VA type, ECB type, or IPS type liquid crystal display, and is particularly effective for speeding up response without thinning cell gaps.Type: GrantFiled: December 14, 2005Date of Patent: March 2, 2010Assignee: Dainippon Ink & Chemicals, Inc.Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto, Yoshitaka Saito, Yutaka Nagashima, Makoto Negishi, Masayuki Iwakubo
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Patent number: 7651630Abstract: A nematic liquid crystal composition of the present invention includes 10 to 80% by mass of either one or at least two compounds represented by general formula (I) as a first component; and 20 to 70% by mass of either one or at least two compounds represented by general formula (II) as a second component, wherein a dielectric constant anisotropy is negative. The use of this nematic liquid crystal composition can provide a highly reliable liquid crystal display element capable of maintaining a high voltage-holding ratio even in a high temperature region, and achieving quick responsiveness without reducing the cell gap.Type: GrantFiled: February 27, 2006Date of Patent: January 26, 2010Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto, Yoshitaka Saito, Yutaka Nagashima, Makoto Negishi, Masayuki Iwakubo
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Publication number: 20090200514Abstract: A nematic liquid crystal composition of the present invention includes one or at least two compounds represented by general formula (I) as a first component; and one or at least two compounds represented by general formula (II) as a second component, wherein a dielectric anisotropy is negative. The use of this nematic liquid crystal composition can provide a highly reliable liquid crystal display element capable of maintaining a high voltage-holding ratio even in a high temperature region, and achieving quick responsiveness without reducing the cell gap.Type: ApplicationFiled: March 15, 2006Publication date: August 13, 2009Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto
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Publication number: 20090050843Abstract: A nematic liquid crystal composition of the present invention includes 10 to 80% by mass of either one or at least two compounds represented by general formula (I) as a first component; and 20 to 70% by mass of either one or at least two compounds represented by general formula (II) as a second component, wherein a dielectric constant anisotropy is negative. The use of this nematic liquid crystal composition can provide a highly reliable liquid crystal display element capable of maintaining a high voltage-holding ratio even in a high temperature region, and achieving quick responsiveness without reducing the cell gap.Type: ApplicationFiled: February 27, 2006Publication date: February 26, 2009Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto, Yoshitaka Saito, Yutaka Nagashima, Makoto Negishi, Masayuki Iwakubo
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Patent number: 7405026Abstract: A nematic liquid crystal composition includes at least one of liquid crystal compounds containing a trans-4-trifluoromethoxycyclohexyl group in a backbone, in which the number of an intramolecular cyclohexane ring is 2 to 4; at least one of compounds in which ?? is less than 1 in absolute value; and at least one selected from liquid crystal compounds containing a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,2,3,4-tetrahydronaphthalene-2, 6-diyl group in a backbone, in which ?? is 1 or more in absolute value, and a liquid crystal compound in which the number of a six-membered ring is 2 to 4, and ?? is 1 or more in absolute value.Type: GrantFiled: March 17, 2004Date of Patent: July 29, 2008Assignee: Dainippon Ink and Chemicals, Inc.Inventor: Shotaro Kawakami
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Publication number: 20080111107Abstract: The present invention provides a liquid crystal composition having a negative dielectric anisotropy whose absolute value is large, and a low viscosity, and also provides a VA type liquid crystal element using the same. Disclosed is a liquid crystal composition containing a compound represented by the general formula (I) and an alkenyl compound represented by the general formula (II): By combining the liquid compounds according to the present invention, a liquid crystal composition having a low viscosity and a negative dielectric anisotropy could be obtained while nearly maintaining physical properties such as refractive anisotropy. By using the composition, a liquid crystal element having excellent reliability, capable of maintaining a high voltage retention until a high temperature region, is provided, and the display is very applicable as a VA type, ECB type, or IPS type liquid crystal display, and is particularly effective for speeding up response without thinning cell gaps.Type: ApplicationFiled: December 14, 2005Publication date: May 15, 2008Inventors: Shotaro Kawakami, Takashi Matsumoto, Tetsuo Kusumoto, Yoshitaka Saito, Yutaka Nagashima, Makoto Negishi, Masayuki Iwakubo
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Patent number: 7232592Abstract: 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: GrantFiled: November 27, 2003Date of Patent: June 19, 2007Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuo Umezu, Shotaro Kawakami, Kiyofumi Takeuchi, Tetsuo Kusumoto, Shinji Ogawa
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Patent number: 7226644Abstract: The present invention relates to a liquid crystal compound which has negative dielectric anisotropy and a large absolute value thereof; and a liquid crystal display element which contains the compound as a constituent element and has a negative value of dielectric anisotropy in the vertical alignment mode, IPS, or the like. The liquid-crystal display element has a structure including a pair of substrates and a liquid crystal sandwiched therebetween, and includes at least an alignment control layer, a transparent electrode, and a polarizing plate, in which the liquid crystal includes at least one compound having a partial structure represented by general formula (A): (wherein W1 and W2 each independently represents fluorine, chlorine, —CF3, —CF2H, —OCF3, or —OCF2H) and has negative dielectric anistropy.Type: GrantFiled: June 25, 2004Date of Patent: June 5, 2007Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Takashi Matsumoto, Tetsuo Kusumoto, Shotaro Kawakami
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Publication number: 20060172089Abstract: A nematic liquid crystal composition includes at least one of liquid crystal compounds containing a trans-4-trifluoromethoxycyclohexyl group in a backbone, in which the number of an intramolecular cyclohexane ring is 2 to 4; at least one of compounds in which ?? is less than 1 in absolute value; and at least one selected from liquid crystal compounds containing a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,2,3,4-tetrahydronaphthalene-2, 6-diyl group in a backbone, in which ?? is 1 or more in absolute value, and a liquid crystal compound in which the number of a six-membered ring is 2 to 4, and ?? is 1 or more in absolute value.Type: ApplicationFiled: March 17, 2004Publication date: August 3, 2006Applicant: DAINIPPON INK AND CHEMICALS, INC.,Inventor: Shotaro Kawakami
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Publication number: 20060163536Abstract: The present invention relates to a liquid crystal compound which has negative dielectric anisotropy and a large absolute value thereof; and a liquid crystal display element which contains the compound as a constituent element and has a negative value of dielectric anisotropy in the vertical alignment mode, IPS, or the like. The liquid-crystal display element has a structure including a pair of substrates and a liquid crystal sandwiched therebetween, and includes at least an alignment control layer, a transparent electrode, and a polarizing plate, in which the liquid crystal includes at least one compound having a partial structure represented by general formula (A): (wherein W1 and W2 each independently represents fluorine, chlorine, —CF3, —CF2H, —OCF3, or —OCF2H) and has negative dielectric anistropy.Type: ApplicationFiled: June 25, 2004Publication date: July 27, 2006Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Takashi Matsumoto, Tetsuo Kusumoto, Shotaro Kawakami
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Publication number: 20060102878Abstract: 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: ApplicationFiled: November 27, 2003Publication date: May 18, 2006Inventors: Yasuo Umezu, Shotaro Kawakami, Kiyofumi Takeuchi, Tetsuo Kusumoto, Shinji Ogawa
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Patent number: 6620467Abstract: A supertwisted nematic liquid crystal display having twist angle of 180 to 270° C. and comprising: a pair of substrates each having an orientation-controlling layer and a transparent electrodel; a liquid crystal layer comprising a liquid crystal composition, which is sandwiched by the substrates; and at least one polarizing sheet provided on at least one of the substrates, wherein the liquid crystal composition comprises: at least one compound represented by formula (I): and at least one compound represented by formula (II): and wherein said liquid crystal composition has a nematic-isotropic phase transition temperature of 75 to 150° C. and a refractive index anisotropy (&Dgr;n) of 0.07 to 0.25. The symbols in formulae (I) and (II) are defined in the specification.Type: GrantFiled: July 25, 2001Date of Patent: September 16, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Shotaro Kawakami, Haruyoshi Takatsu, Hiroyuki Ohnishi, Naoe Katoh
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Patent number: 6607791Abstract: A liquid crystal composition comprises as a first liquid crystal component a compound represented by the following general formula (I): and as a second liquid crystal component a compound selected from the group consisting of compounds represented by the following general formulae (II) and (III): and has a nematic phase upper temperature limit of 75° C. or higher and &Dgr;n of from 0.07 to 0.18.Type: GrantFiled: October 27, 2000Date of Patent: August 19, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Ogawa, Masashi Osawa, Hiroyuki Ohnishi, Haruyoshi Takatsu, Kiyofumi Takeuchi, Shotaro Kawakami, Takeshi Kuriyama
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Patent number: 6562421Abstract: A supertwisted nematic liquid crystal display comprising: a pair of substrates each having a liquid crystal orientation-controlling layer and a transparent electrode; a liquid crystal material held between said substrates; and at least one polarizing sheet provided on at least one of said substrates, wherein said liquid crystal material comprises: (a) a compound represented by formula (I): and (b) at least one compound selected from the group consisting of: compounds represented by formula (II): and compounds represented by formula (III):Type: GrantFiled: August 29, 2001Date of Patent: May 13, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Takeshi Kuriyama, Shotaro Kawakami, Hiroyuki Ohnishi, Haruyoshi Takatsu
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Publication number: 20020163487Abstract: A supertwisted nematic liquid crystal display comprising: a pair of substrates each having a liquid crystal orientation-controlling layer and a transparent electrode; a liquid crystal material held between said substrates; and at least one polarizing sheet provided on at least one of said substrates, wherein said liquid crystal material comprises: (a) a compound represented by formula (I): 1Type: ApplicationFiled: August 29, 2001Publication date: November 7, 2002Applicant: DAINIPPON INK AND CHEMICALS, INCInventors: Go Sudo, Takeshi Kuriyama, Shotaro Kawakami, Hiroyuki Ohnishi, Haruyoshi Takatsu
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Publication number: 20020033929Abstract: A supertwisted nematic liquid crystal display having twist angle of 180 to 270° C.Type: ApplicationFiled: July 25, 2001Publication date: March 21, 2002Applicant: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Shotaro Kawakami, Haruyoshi Takatsu, Hiroyuki Ohnishi, Naoe Katoh