Patents by Inventor Joji Kawamura
Joji Kawamura 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: 10558084Abstract: A method of fabricating a liquid crystal display device includes forming a first alignment layer on a first substrate, forming a second alignment layer on a second substrate, disposing the first substrate and the second substrate such that the first alignment layer and the second alignment layer are spaced apart, forming a liquid crystal layer including liquid crystal molecules between the first alignment layer and the second alignment layer and forming an electrode layer on one of the first substrate and the second substrate, the electrode layer applying an electric field to the liquid crystal molecules along a direction parallel to the first and second substrates, the forming the first alignment layer including applying a copolymer solution including first moieties and second moieties, and the first moieties have affinity with the first substrate, and the second moieties have compatibility with the liquid crystal molecules and heating the first alignment layer.Type: GrantFiled: March 14, 2019Date of Patent: February 11, 2020Assignees: LG DISPLAY CO., LTD., TOKYO INSTITUTE OF TECHNOLOGYInventors: Osamu Sato, Joji Kawamura, Masatoshi Tokita, Junji Watanabe
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Publication number: 20190212591Abstract: A method of fabricating a liquid crystal display device includes forming a first alignment layer on a first substrate, forming a second alignment layer on a second substrate, disposing the first substrate and the second substrate such that the first alignment layer and the second alignment layer are spaced apart, forming a liquid crystal layer including liquid crystal molecules between the first alignment layer and the second alignment layer and forming an electrode layer on one of the first substrate and the second substrate, the electrode layer applying an electric field to the liquid crystal molecules along a direction parallel to the first and second substrates, the forming the first alignment layer including applying a copolymer solution including first moieties and second moieties, and the first moieties have affinity with the first substrate, and the second moieties have compatibility with the liquid crystal molecules and heating the first alignment layer.Type: ApplicationFiled: March 14, 2019Publication date: July 11, 2019Applicants: LG DISPLAY CO., LTD., TOKYO INSTITUTE OF TECHNOLOGYInventors: Osamu SATO, Joji KAWAMURA, Masatoshi TOKITA, Junji WATANABE
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Patent number: 10344211Abstract: There is provided a liquid crystal composition including at least one compound represented by General Formula (i) and at least one compound represented by General Formula (N). The total amount of the compound represented by General Formula (i) is 10% by mass or greater. In the liquid crystal composition and the liquid crystal display element using the composition, the liquid crystal composition has a positive ?? and a flat transmission characteristic curve. Therefore, gradation characteristics are easily controlled. Furthermore, display defects due to burn-in, dropping marks, and the like can be suppressed, and therefore excellent display quality is exhibited. The liquid crystal display element using this liquid crystal composition can be also provided.Type: GrantFiled: December 8, 2015Date of Patent: July 9, 2019Assignee: DIC CORPORATIONInventors: Shiro Taniguchi, Joji Kawamura
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Patent number: 10316251Abstract: A liquid crystal composition having negative dielectric anisotropy, large refractive index anisotropy, and low viscosity and containing as a first component, one or two or more compounds represented by general formula (I) and, as a second component, one or two or more compounds represented by general formula (II), wherein dielectric anisotropy (??) at 25° C. is ?2.0 or less. Also, a liquid crystal display device having high contrast, fast response, and excellent display quality without causing image sticking and display defects.Type: GrantFiled: August 22, 2017Date of Patent: June 11, 2019Assignee: DIC CORPORATIONInventors: Takeshi Kuriyama, Joji Kawamura
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Patent number: 10281770Abstract: A liquid crystal display device according to an embodiment includes a light source; a first substrate on which a first alignment layer is formed; a second substrate on which a second alignment layer is formed; a liquid crystal layer between the first and second alignment layers; and an electrode layer on one of the first and second substrates, the electrode layer applying an electric field to liquid crystal molecules of the liquid crystal layer along a direction parallel to the first and second substrates, wherein when the electric field is applied, the liquid crystal molecules are twistedly arranged from the second alignment layer to the first alignment layer.Type: GrantFiled: March 10, 2017Date of Patent: May 7, 2019Assignees: LG DISPLAY CO., LTD., TOKYO INSTITUTE OF TECHNOLOGYInventors: Osamu Sato, Joji Kawamura, Masatoshi Tokita, Junji Watanabe
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Patent number: 10253258Abstract: The present invention provides a liquid crystal composition including at least one compound represented by General Formula (1), at least one compound represented by General Formula (2), and at least one compound represented by General Formula (LC1). The liquid crystal composition of the present invention has high refractive index anisotropy (?n) and sufficiently low viscosity (?), achieves a wide nematic phase temperature range by suppressing a decrease in nematic phase-isotropic liquid phase transition temperature (Tni), and exhibits high compatibility. By using the liquid crystal composition of the present invention in a liquid crystal display element, a liquid crystal display element having a high response speed and high practical reliability can be obtained.Type: GrantFiled: July 28, 2015Date of Patent: April 9, 2019Assignee: DIC CORPORATIONInventors: Shirou Taniguchi, Joji Kawamura
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Patent number: 10208250Abstract: Provided are a liquid crystal composition including at least one or more compounds represented by General Formula (i) and at least one or more compounds represented by General Formula (M-1), in which the dielectric constant anisotropy at 25° C. is larger than 0 and 5 or less; and a liquid crystal display element using this composition. The liquid crystal composition has a positive ??, can have the electrical capacity of the liquid crystal layer (CLC) reduced to a low level, can be driven at a voltage that is practically sufficiently low, and satisfies at least any one of the requirements of maintaining a liquid crystal phase over a wider temperature range, low viscosity, satisfactory solubility at low temperature, high specific resistance or voltage retention rate, and stability to heat or light; and provide an excellent liquid crystal display element.Type: GrantFiled: December 17, 2014Date of Patent: February 19, 2019Assignee: DIC CORPORATIONInventors: Shirou Taniguchi, Joji Kawamura
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Patent number: 10000700Abstract: The present invention provides a liquid crystal composition having positive dielectric anisotropy and containing at least one compound represented by general formula (LC0): and at least one compound represented by general formula (LC1): R11A11-Z11m11A12-Z12-A13-R12??(LC1) The liquid crystal composition according to the present invention has refractive index anisotropy (?n) adjusted to the desired level and a decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and an increase in the nematic phase lower limit temperature are suppressed so as to achieve a sufficiently low viscosity (?) without degrading the nematic phase temperature range. When the liquid crystal composition of the present invention is used to produce a liquid crystal display device, a highly practical and highly reliable liquid crystal display device with high response speed and capacity for low-voltage drive is obtained.Type: GrantFiled: July 28, 2015Date of Patent: June 19, 2018Assignee: DIC CORPORATIONInventors: Shirou Taniguchi, Joji Kawamura
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Patent number: 9963636Abstract: The present invention relates to a liquid crystal composition used in a liquid crystal display device. A problem to be solved by the invention is to provide a liquid crystal composition and a liquid crystal display device using the liquid crystal composition, the liquid crystal composition being suitable for a liquid crystal display device, causing little dropping marks during manufacture and realizing stable discharge of a liquid crystal material in an ODF process without degrading characteristics as a liquid crystal display device, such as dielectric anisotropy, bulk viscosity, nematic phase upper limit temperature, rotational viscosity ?1, voltage holding ratio, etc. and image sticking characteristic of a display device. The present invention relates to a liquid crystal composition having negative dielectric anisotropy and containing compounds represented by formula (i) and formula (XIII-1-2) or formula (XIII-1-4) and also relates to a liquid crystal display device using the liquid crystal composition.Type: GrantFiled: February 12, 2013Date of Patent: May 8, 2018Assignee: DIC CORPORATIONInventors: Yoshinori Iwashita, Joji Kawamura, Makoto Negishi, Shinji Ogawa
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Patent number: 9938463Abstract: There is provided a liquid crystal display device that uses such a liquid crystal composition is also provided. Provided is a liquid crystal composition that includes a first component which is at least one selected from the group consisting of compounds represented by general formula (1) and a second component which is at least one component selected from the group consisting of compounds represented by general formula (2). Also provided is a liquid crystal display device that uses a liquid crystal composition that contains the first component and the second component.Type: GrantFiled: March 26, 2013Date of Patent: April 10, 2018Assignee: DIC CORPORATIONInventors: Shinji Ogawa, Yoshinori Iwashita, Joji Kawamura, Makoto Negishi
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Publication number: 20170355906Abstract: There is provided a liquid crystal composition including at least one compound represented by General Formula (i) and at least one compound represented by General Formula (N). The total amount of the compound represented by General Formula (i) is 10% by mass or greater. In the liquid crystal composition and the liquid crystal display element using the composition, the liquid crystal composition has a positive ?? and a flat transmission characteristic curve. Therefore, gradation characteristics are easily controlled. Furthermore, display defects due to burn-in, dropping marks, and the like can be suppressed, and therefore excellent display quality is exhibited. The liquid crystal display element using this liquid crystal composition can be also provided.Type: ApplicationFiled: December 8, 2015Publication date: December 14, 2017Applicant: DIC CorporationInventors: Shiro Taniguchi, Joji Kawamura
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Publication number: 20170349829Abstract: A liquid crystal composition having negative dielectric anisotropy, large refractive index anisotropy, and low viscosity and containing as a first component, one or two or more compounds represented by general formula (I) and, as a second component, one or two or more compounds represented by general formula (II), wherein dielectric anisotropy (??) at 25° C. is ?2.0 or less. Also, a liquid crystal display device having high contrast, fast response, and excellent display quality without causing image sticking and display defects.Type: ApplicationFiled: August 22, 2017Publication date: December 7, 2017Applicant: DIC CORPORATIONInventors: Takeshi Kuriyama, Joji Kawamura
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Patent number: 9828549Abstract: There is provided a liquid crystal composition containing any one or two or more of compounds represented by general formula (i) below and any one or two or more of compounds represented by general formula (ii) below.Type: GrantFiled: February 20, 2013Date of Patent: November 28, 2017Assignee: DIC CORPORATIONInventors: Joji Kawamura, Makoto Negishi, Yoshinori Iwashita
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Patent number: 9822304Abstract: It is an object of the present invention to provide a liquid crystal composition having positive ??, having a liquid crystal phase in a wide temperature range, having high solubility at low temperatures, having high ODF process compatibility, having a high specific resistance and voltage holding ratio, and being insensitive to heat and light. In order to achieve this object, there is provided a liquid crystal composition containing at least one compound represented by the following general formula (i) and at least one compound represented by the following general formula (ii).Type: GrantFiled: March 25, 2013Date of Patent: November 21, 2017Assignee: DIC CORPORATIONInventors: Joji Kawamura, Makoto Negishi, Yoshinori Iwashita
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Publication number: 20170261783Abstract: A liquid crystal display device according to an embodiment includes a light source; a first substrate on which a first alignment layer is formed; a second substrate on which a second alignment layer is formed; a liquid crystal layer between the first and second alignment layers; and an electrode layer on one of the first and second substrates, the electrode layer applying an electric field to liquid crystal molecules of the liquid crystal layer along a direction parallel to the first and second substrates, wherein when the electric field is applied, the liquid crystal molecules are twistedly arranged from the second alignment layer to the first alignment layer.Type: ApplicationFiled: March 10, 2017Publication date: September 14, 2017Applicants: LG DISPLAY CO., LTD., TOKYO INSTITUTE OF TECHNOLOGYInventors: Osamu SATO, Joji KAWAMURA, Masatoshi TOKITA, Junji WATANABE
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Publication number: 20170260451Abstract: The liquid crystal composition of the present invention can be used in a liquid crystal display element of an IPS type or a TN type in which display defects such as burn-in and dropping marks in high speed response are unlikely to be generated. Since the liquid crystal composition contains a component which is a dielectrically positive component including a dielectrically positive compound and a dielectrically neutral component of which dielectric anisotropy is greater than ?2 and less than +2, the liquid crystal composition has excellent characteristics that the liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, excellent solubility at a low temperature, high specific resistance and a high voltage holding ratio, and is stable with respect to heat and light.Type: ApplicationFiled: May 30, 2017Publication date: September 14, 2017Applicant: DIC CORPORATIONInventor: Joji Kawamura
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Patent number: 9745513Abstract: The present invention provides a liquid crystal composition having negative dielectric anisotropy, large refractive index anisotropy, and low viscosity and containing as a first component, one or two or more compounds represented by general formula (I) and, as a second component, one or two or more compounds represented by general formula (II), wherein dielectric anisotropy (??) at 25° C. is ?2.0 or less. Also, provided is a liquid crystal display device having high contrast, fast response, and excellent display quality without causing image sticking and display defects.Type: GrantFiled: October 31, 2013Date of Patent: August 29, 2017Assignee: DIC CORPORATIONInventors: Takeshi Kuriyama, Joji Kawamura
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Publication number: 20170218269Abstract: The present invention provides a liquid crystal composition including at least one compound represented by General Formula (1), at least one compound represented by General Formula (2), and at least one compound represented by General Formula (LC1). The liquid crystal composition of the present invention has high refractive index anisotropy (?n) and sufficiently low viscosity (?), achieves a wide nematic phase temperature range by suppressing a decrease in nematic phase-isotropic liquid phase transition temperature (Tni), and exhibits high compatibility. By using the liquid crystal composition of the present invention in a liquid crystal display element, a liquid crystal display element having a high response speed and high practical reliability can be obtained.Type: ApplicationFiled: July 28, 2015Publication date: August 3, 2017Applicant: DIC CORPORATIONInventors: Shirou Taniguchi, Joji Kawamura
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Publication number: 20170198219Abstract: The present invention provides a liquid crystal composition having positive dielectric anisotropy and containing at least one compound represented by general formula (LC0): and at least one compound represented by general formula (LC1): R11?A11-Z11?m11A12-Z12-A13-R12??(LC1) The liquid crystal composition according to the present invention has refractive index anisotropy (?n) adjusted to the desired level and a decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and an increase in the nematic phase lower limit temperature are suppressed so as to achieve a sufficiently low viscosity (?) without degrading the nematic phase temperature range. When the liquid crystal composition of the present invention is used to produce a liquid crystal display device, a highly practical and highly reliable liquid crystal display device with high response speed and capacity for low-voltage drive is obtained.Type: ApplicationFiled: July 28, 2015Publication date: July 13, 2017Applicant: DIC CorporationInventors: Shirou TANIGUCHI, Joji KAWAMURA
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Patent number: 9695361Abstract: The liquid crystal composition of the present invention can be used in a liquid crystal display element of an IPS type or a TN type in which display defects such as burn-in and dropping marks in high speed response are unlikely to be generated. Since the liquid crystal composition contains a component which is a dielectrically positive component including a dielectrically positive compound and a dielectrically neutral component of which dielectric anisotropy is greater than ?2 and less than +2, the liquid crystal composition has excellent characteristics that the liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, excellent solubility at a low temperature, high specific resistance and a high voltage holding ratio, and is stable with respect to heat and light.Type: GrantFiled: October 5, 2012Date of Patent: July 4, 2017Assignee: DIC CORPORATIONInventor: Joji Kawamura