Patents by Inventor Shigeru Matsuyama
Shigeru Matsuyama 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: 9285636Abstract: An image retention phenomenon and black unevenness generated after long-time operation in the liquid crystal device are prevented. By using a material having a polyamide acid ester as a precursor less likely to adsorb impurities on a boundary for an alignment film and a material having a dielectric constant anisotropy ?? of 5 or less for liquid crystals, adsorption of an antioxidant dispersed in the liquid crystals is suppressed to prevent oxidation of the liquid crystals. The extent that impurities are intruded into the liquid crystals is reduced by restricting the dielectric constant anisotropy ?? of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness.Type: GrantFiled: May 27, 2009Date of Patent: March 15, 2016Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Noboru Kunimatsu, Chikae Matsui, Shigeru Matsuyama, Masaki Matsumori, Yasushi Tomioka, Katsumi Kondo
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Patent number: 8259262Abstract: Provided is a liquid crystal display apparatus including: a liquid crystal panel including a pair of substrates; a liquid crystal layer sandwiched by the pair of substrates; plural electrodes formed on at least one of the pair of substrates; and a pair of polarizers provided in respective outsides of the pair of substrates; and a back light unit provided in a rear of the liquid crystal panel, in which one of the pair of polarizers, which is provided at a side of the back light unit, includes at least two types of layers which cause polarization, and in which the two types of layers include a first layer provided on a side of the liquid crystal layer and a second layer provided on a side of the back light unit, the first layer being a negative uniaxial polarizer layer, the second layer being a positive uniaxial polarizer layer.Type: GrantFiled: August 12, 2009Date of Patent: September 4, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Yuka Utsumi, Ikuo Hiyama, Katsumi Kondo, Shigeru Matsuyama
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Patent number: 8059245Abstract: 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: September 28, 2010Date of Patent: November 15, 2011Assignee: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 7948600Abstract: A liquid crystal display device having high quality and high reliability is manufactured by preventing the occurrence of damages on a terminal portion due to the radiation of laser beams in cutting a substrate of the display device which is formed using a plastic substrate by the radiation of laser beams. A first substrate has a cutting line at a position which faces a terminal portion of a second substrate. In cutting the first substrate along the cutting line, laser beams are radiated to the first substrate along the cutting line so as to form a groove having a predetermined depth in the first substrate. Then, a load is applied to the first substrate along the groove so as to cut the first substrate.Type: GrantFiled: April 30, 2009Date of Patent: May 24, 2011Assignee: Hitachi Displays, Ltd.Inventors: Masataka Okamoto, Shigeru Matsuyama
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Patent number: 7916254Abstract: A liquid crystal display includes a pair of substrates including at least one transparent substrate, a liquid crystal layer arranged between the substrates, a plurality of electrodes formed on at least one of the substrates to apply an electric field to the liquid crystal layer, a plurality of active elements connected to the electrodes, an alignment layer formed on the surface of each of the substrates in contact with the liquid crystal layer, and an optical means formed on at least one of the substrates to change the optical characteristics in accordance with the alignment condition of the particles of the liquid crystal layer. The taper angle at the ends of the electrodes is larger than 45 degrees but less than 90 degrees.Type: GrantFiled: October 27, 2004Date of Patent: March 29, 2011Assignee: Hitachi Displays, Ltd.Inventors: Masaki Matsumori, Yasushi Tomioka, Shigeru Matsuyama
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Patent number: 7894029Abstract: Work is irradiated with polarized light generated by configuring in such a manner as to have a polarizer using a grating that separates polarized light from non-polarized light, a lamp and a condenser mirror that allow light to fall on the polarizer, a collimator lens that converts the incoming light into parallel beams, an integrator lens that uniformizes intensity distribution of light radiated from the polarizer, and a diffusion lens with functions to enlarge or contract the irradiated range to the work size, and by forming protrusions and recesses of the shape, material, and size that fit to the desired wavelength on a substrate such as quartz, etc. that transmit ultraviolet light, and by providing the light-polarizing performance by appropriately providing an incident angle. By carrying out this processing, the alignment film in the liquid crystal display element can be photo-aligned at high accuracy and uniformly.Type: GrantFiled: April 12, 2005Date of Patent: February 22, 2011Assignee: Hitachi Displays, Ltd.Inventors: Takeshi Arai, Yasuhiro Yoshitake, Shigeru Matsuyama
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Publication number: 20110019116Abstract: 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: September 28, 2010Publication date: January 27, 2011Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 7826022Abstract: 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: April 20, 2009Date of Patent: November 2, 2010Assignee: Hitachi, Ltd.Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
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Patent number: 7742138Abstract: It is an object to provide a liquid crystal display which reduces unsatisfactory display caused by distorted initial alignment direction in a liquid crystal alignment layer for IPS type displays, realizes stable liquid crystal alignment, is high in mass-productivity, and produces high-quality images of increased contrast ratio. The liquid crystal display contains alignment layers 109 placed between a pair of substrates 101 and 102, at least one of which is transparent, liquid crystal layer 110? sealed between the alignment layers, common electrode 103 and source electrode 105 for applying an electrical field to the liquid crystal layer, thin-film transistors connected to each of these electrodes, polarizer plate 114 provided on at least one of the substrates, wherein at least one of the alignment layers 109 is composed of a photo-reactive polyimide and/or polyamic acid which can be provided with a liquid crystal alignment capacity by being irradiated with essentially linearly polarized light.Type: GrantFiled: June 7, 2005Date of Patent: June 22, 2010Assignee: Hitachi Displays, Ltd.Inventors: Masaki Matsumori, Yasushi Tomioka, Shigeru Matsuyama
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Publication number: 20100066949Abstract: Provided is a liquid crystal display apparatus including: a liquid crystal panel including a pair of substrates; a liquid crystal layer sandwiched by the pair of substrates; plural electrodes formed on at least one of the pair of substrates; and a pair of polarizers provided in respective outsides of the pair of substrates; and a back light unit provided in a rear of the liquid crystal panel, in which one of the pair of polarizers, which is provided at a side of the back light unit, includes at least two types of layers which cause polarization, and in which the two types of layers include a first layer provided on a side of the liquid crystal layer and a second layer provided on a side of the back light unit, the first layer being a negative uniaxial polarizer layer, the second layer being a positive uniaxial polarizer layer.Type: ApplicationFiled: August 12, 2009Publication date: March 18, 2010Inventors: Yuka UTSUMI, Ikuo Hiyama, Katsumi Kondo, Shigeru Matsuyama
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Publication number: 20100060836Abstract: An image retention phenomenon and black unevenness generated after long-time operation in the liquid crystal device are prevented. By using a material having a polyamide acid ester as a precursor less likely to adsorb impurities on a boundary for an alignment film and a material having a dielectric constant anisotropy ?? of 5 or less for liquid crystals, adsorption of an antioxidant dispersed in the liquid crystals is suppressed to prevent oxidation of the liquid crystals. The extent that impurities are intruded into the liquid crystals is reduced by restricting the dielectric constant anisotropy ?? of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness.Type: ApplicationFiled: May 27, 2009Publication date: March 11, 2010Inventors: Noboru KUNIMATSU, Chikae MATSUI, Shigeru MATSUYAMA, Masaki MATSUMORI, Yasushi TOMIOKA, Katsumi KONDO
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Publication number: 20090275158Abstract: A liquid crystal display device having high quality and high reliability is manufactured by preventing the occurrence of damages on a terminal portion due to the radiation of laser beams in cutting a substrate of the display device which is formed using a plastic substrate by the radiation of laser beams. A first substrate has a cutting line at a position which faces a terminal portion of a second substrate. In cutting the first substrate along the cutting line, laser beams are radiated to the first substrate along the cutting line so as to form a groove having a predetermined depth in the first substrate. Then, a load is applied to the first substrate along the groove so as to cut the first substrate.Type: ApplicationFiled: April 30, 2009Publication date: November 5, 2009Inventors: Masataka OKAMOTO, Shigeru MATSUYAMA
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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: 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: 20090103010Abstract: To provide a liquid crystal display device and a manufacturing method thereof having high quality and high reliability by reducing damages to a connection terminal portion due to laser light when performing cutting of a substrate of a liquid crystal display panel using a plastic substrate at the connection terminal portion by irradiating laser light.Type: ApplicationFiled: October 17, 2008Publication date: April 23, 2009Inventors: Masataka Okamoto, Shigeru Matsuyama
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Patent number: 7489378Abstract: In a liquid crystal display device using a photodecomposition type light orientation film, the deterioration of display performance due to an impurity resulting from a light orientation treatment of the orientation film is suppressed to enable high-quality image display. In the orientation film to which a liquid crystal orientation function is provided, the amount of decomposition product due to the orientation film is 3957.5 ng or less per 100 cm2.Type: GrantFiled: December 26, 2006Date of Patent: February 10, 2009Assignee: Hitachi Displays, Ltd.Inventors: Aki Sakai, Noboru Kunimatsu, Hidehiro Sonoda, Shigeru Matsuyama
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Publication number: 20080191991Abstract: A driver for a liquid crystal device includes a plurality of common drivers having a first common driver and a last common driver for comb-like driving that is coupled in cascade connection and a frequency divider that produces a second clock for interlaced driving by halving a period of a first clock that is provided from outside for serving as a basis of driving the drivers regarding each of the common drivers for comb-like driving aside from the first common driver and the last common driver. A converter circuit converts two periods of output data that are output in response to input data corresponding to one period of the first clock into one period of output data by using the second clock regarding input and output data of each of the common drivers for comb-like driving.Type: ApplicationFiled: March 3, 2008Publication date: August 14, 2008Applicant: Seiko Epson CorporationInventor: Shigeru Matsuyama
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Patent number: 7405718Abstract: A driver for a liquid crystal device includes a plurality of common drivers having a first common driver and a last common driver for comb-like driving that is coupled in cascade connection and a frequency divider that produces a second clock for interlaced driving by halving a period of a first clock that is provided from outside for serving as a basis of driving the drivers regarding each of the common drivers for comb-like driving aside from the first common driver and the last common driver. A converter circuit converts two periods of output data that are output in response to input data corresponding to one period of the first clock into one period of output data by using the second clock regarding input and output data of each of the common drivers for comb-like driving.Type: GrantFiled: December 15, 2003Date of Patent: July 29, 2008Assignee: Seiko Epson CorporationInventor: Shigeru Matsuyama
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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: 20070148369Abstract: In a liquid crystal display device using a photodecomposition type light orientation film, the deterioration of display performance due to an impurity resulting from a light orientation treatment of the orientation film is suppressed to enable high-quality image display. In the orientation film to which a liquid crystal orientation function is provided, the amount of decomposition product due to the orientation film is 3957.5 ng or less per 100 cm2.Type: ApplicationFiled: December 26, 2006Publication date: June 28, 2007Inventors: Aki Sakai, Noboru Kunimatsu, Hidehiro Sonoda, Shigeru Matsuyama