Patents by Inventor Yasushi Iwakabe
Yasushi Iwakabe 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: 7738069Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: GrantFiled: April 15, 2008Date of Patent: June 15, 2010Assignee: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20090207361Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: ApplicationFiled: April 20, 2009Publication date: August 20, 2009Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 7551169Abstract: A liquid crystal display device can suppress the local temperature elevation of a liquid crystal in the vicinity of drivers. On a liquid-crystal-side surface of one substrate out of substrates which are arranged to face each other in an opposed manner while sandwiching a liquid crystal therebetween, a switching element which is operated in response to scanning signals from a gate signal line, a pixel electrode to which video signals from a drain signal line are supplied via the switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode are mounted on each pixel region of the liquid-crystal-side surface. The video signals from the drain signal line are generated by a driver chip mounted on one substrate. A light transmittivity of the liquid crystal layer is set to take a minimum value when a voltage is not applied between the pixel electrode and the reference electrode.Type: GrantFiled: December 5, 2006Date of Patent: June 23, 2009Assignee: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
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Patent number: 7542121Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: GrantFiled: November 7, 2007Date of Patent: June 2, 2009Assignee: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Patent number: 7538829Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: GrantFiled: October 24, 2006Date of Patent: May 26, 2009Assignee: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Publication number: 20080225223Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: April 15, 2008Publication date: September 18, 2008Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Patent number: 7382432Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: GrantFiled: May 22, 2006Date of Patent: June 3, 2008Assignee: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20080084527Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: November 19, 2007Publication date: April 10, 2008Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20080074604Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: November 7, 2007Publication date: March 27, 2008Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Patent number: 7256843Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: GrantFiled: August 11, 2003Date of Patent: August 14, 2007Assignee: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Publication number: 20070075947Abstract: A liquid crystal display device can suppress the local temperature elevation of a liquid crystal in the vicinity of drivers. On a liquid-crystal-side surface of one substrate out of substrates which are arranged to face each other in an opposed manner while sandwiching a liquid crystal therebetween, a switching element which is operated in response to scanning signals from a gate signal line, a pixel electrode to which video signals from a drain signal line are supplied via the switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode are mounted on each pixel region of the liquid-crystal-side surface. The video signals from the drain signal line are generated by a driver chip mounted on one substrate. A light transmittivity of the liquid crystal layer is set to take a minimum value when a voltage is not applied between the pixel electrode and the reference electrode.Type: ApplicationFiled: December 5, 2006Publication date: April 5, 2007Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
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Publication number: 20070035686Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: ApplicationFiled: October 24, 2006Publication date: February 15, 2007Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 7164402Abstract: A liquid crystal display device can suppress the local temperature elevation of a liquid crystal in the vicinity of drivers. On a liquid-crystal-side surface of one substrate out of substrates which are arranged to face each other in an opposed manner while sandwiching a liquid crystal therebetween, a switching element which is operated in response to scanning signals from a gate signal line, a pixel electrode to which video signals from a drain signal line are supplied via the switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode are mounted on each pixel region of the liquid-crystal-side surface. The video signals from the drain signal line are generated by a driver chip mounted on one substrate. A light transmittivity of the liquid crystal layer is set to take a minimum value when a voltage is not applied between the pixel electrode and the reference electrode.Type: GrantFiled: September 10, 2001Date of Patent: January 16, 2007Assignee: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
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Publication number: 20060209244Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: May 22, 2006Publication date: September 21, 2006Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20040085506Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: October 28, 2003Publication date: May 6, 2004Applicant: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20040027507Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: ApplicationFiled: August 11, 2003Publication date: February 12, 2004Applicant: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 6678030Abstract: There is provided a liquid crystal display device in which the gap between its transparent substrates can be kept uniform irrespective of whether the temperature of the device is normal temperature or high temperature. The liquid crystal display device includes transparent substrates disposed in opposition to each other with a liquid crystal being interposed therebetween, and plural spacers secured to one of the transparent substrates so as to support the other transparent substrate. The plural spacers include first spacers and second spacers, and the first spacers are formed of a material whose elasticity is higher than that of the second spacers, and are larger in height than the second spacers.Type: GrantFiled: July 13, 2001Date of Patent: January 13, 2004Assignee: Hitachi, Ltd.Inventors: Makiko Imabayashi, Shinji Hasegawa, Yasushi Iwakabe
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Patent number: 6645576Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.Type: GrantFiled: May 30, 2001Date of Patent: November 11, 2003Assignee: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 6535264Abstract: A liquid crystal display device is capable of providing high-quality picture display by preventing luminance irregularity in a display screen due to the nonuniformity of a cell gap. The liquid crystal display device includes at least two or more kinds of color filters FIL formed over one of substrates, the color filters having different colors for displaying a color display, a black matrix interposed between each of the color filters, pixel-forming electrodes ITO2, an alignment control layer, a spacer SOC fixedly formed over at least one of the substrates with a height approximately equal to a desired gap between the substrates, and a bead interposed between the substrates and made of a resin material whose average grain size is slightly greater than the height of the spacer SOC.Type: GrantFiled: November 8, 2000Date of Patent: March 18, 2003Assignee: Hitachi, Ltd.Inventors: Makiko Imabayashi, Shinji Hasegawa, Yasushi Iwakabe
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Publication number: 20020075442Abstract: There is provided a liquid crystal display device in which light leaks near spacers are prevented. The liquid crystal display device controls the optical transmissivity of a liquid crystal layer interposed between substrates disposed in opposition to each other, by means of an electric field generated in the layer-thickness direction of the liquid crystal layer, includes spacers formed on a liquid-crystal-side surface of one of the substrates, signal lines formed on a liquid-crystal-side surface of the other substrate, an insulating film formed to cover the signal lines, and electrodes formed on the upper surface of the insulating film, each of which serves as one electrode contributing to control of the optical transmissivity of the liquid crystal layer.Type: ApplicationFiled: September 10, 2001Publication date: June 20, 2002Applicant: Hitachi, Ltd.Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi