Patents by Inventor Kazuhito Masuda
Kazuhito Masuda 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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Publication number: 20130313537Abstract: An organic light-emitting display device is provided that has prolonged service life, lowered wiring resistance that can lower power consumption, and that is easy to manufacture. In a first embodiment, a moisture capturing layer is provided between an upper electrode and a lower electrode. A second embodiment includes a metal substrate, an organic light-emitting element on the substrate and an upper transparent electrode connected to the substrate through a contact hole. In a third embodiment, a method is provided for forming a first organic compound including a light-emitting layer, heating the first organic compound in vacuo, and forming a second organic compound.Type: ApplicationFiled: July 25, 2013Publication date: November 28, 2013Applicant: HITACHI, Ltd.Inventors: Sukekazu ARATANI, Kazuhito MASUDA, Kotaro ARAYA, Hiroyuki KAGAWA, Shintaro TAKEDA, Shingo ISHIHARA
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Patent number: 8536611Abstract: An organic light-emitting display device is provided that has prolonged service life, lowered wiring resistance that can lower power consumption, and that is easy to manufacture. In a first embodiment, a moisture capturing layer is provided between an upper electrode and a lower electrode. A second embodiment includes a metal substrate, an organic light-emitting element on the substrate and an upper transparent electrode connected to the substrate through a contact hole. In a third embodiment, a method is provided for forming a first organic compound including a light-emitting layer, heating the first organic compound in vacuo, and forming a second organic compound.Type: GrantFiled: June 15, 2009Date of Patent: September 17, 2013Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Kazuhito Masuda, Kotaro Araya, Hiroyuki Kagawa, Shintaro Takeda, Shingo Ishihara
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Patent number: 8476618Abstract: To provide an organic electroluminescent display device including an organic electroluminescent layer that can be easily fabricated under an atmosphere containing oxygen and which can achieve high efficiency. An organic electroluminescent display device includes a substrate, an organic electroluminescent layer, an upper electrode and a lower electrode sandwiching therein the organic electroluminescent layer, either one of the upper and lower electrodes being a transparent electrode, and the other being a reflecting electrode, and a charge transport layer disposed between the organic electroluminescent layer and the substrate. The charge transport layer is photo-cured by light with a wavelength longer than that of a near-ultraviolet light.Type: GrantFiled: December 19, 2008Date of Patent: July 2, 2013Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Hiroshi Sasaki, Kazuhito Masuda
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Patent number: 8237895Abstract: In a transflective liquid crystal display device including a transmission display portion and a reflection display portion, a dichroic ratio of a polarizing layer contained in a reflection region is increased to enhance display performance. The liquid crystal display device includes: the transmission display portion and the reflection display portion which are formed for each pixel; a reflective layer formed in the reflection display portion; a first substrate having a principal surface opposed to a liquid crystal layer; a second substrate opposed to the first substrate via the liquid crystal layer; and a polarizing layer formed above the reflective layer via an underlying layer thereof on the principal surface of the first substrate. The polarizing layer is made of chromonic liquid crystalline molecules, and an interface between the polarizing layer and the underlying layer has one of a siloxane structure and a silazane structure.Type: GrantFiled: December 17, 2008Date of Patent: August 7, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Miharu Otani, Jun Tanaka, Kazuhito Masuda, Masaya Adachi, Takato Hiratsuka
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Patent number: 8158969Abstract: The present invention is intended to provide a top emission type organic light emitting display device which prevents the organic film from being oxidized during the formation of the upper transparent electrode and can emit light at a low voltage. The top emission type organic light emitting display device includes: a substrate; an organic light emitting layer; and upper and lower electrodes sandwiching the organic light emitting layer, where the lower electrode is arranged between the substrate and the organic light emitting layer, the upper electrode is arranged on the opposite side of the substrate with respect to the lower electrode, light emitted from the organic light emitting layer is taken out from the upper electrode side, and an organic layer which is mainly composed of an organic material having a heterocyclic group containing one or more nitrogen atoms, is included between the organic light emitting layer and the upper electrode.Type: GrantFiled: May 18, 2006Date of Patent: April 17, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Sukekazu Aratani, Hajime Murakami, Masao Shimizu, Kazuhito Masuda
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Patent number: 8154693Abstract: An object of the present invention is to increase the dichroic ratio of the built-in polarizing layer in reflective regions so that the display performance improves in a semi-transmission type liquid crystal display device having a transmissive display portion and a reflective display portion.Type: GrantFiled: July 2, 2009Date of Patent: April 10, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Miharu Otani, Jun Tanaka, Kazuhito Masuda, Masaya Adachi, Takato Hiratsuka
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Publication number: 20110101401Abstract: Disclosed is an organic light-emitting display device that comprises a light-emitting layer formable simply by a wet process and has a prolonged service life. Also disclosed is an organic light-emitting device that comprises an upper transparent electrode having a lowered wiring resistance that can lower wiring resistance-derived power consumption. Further disclosed are a method and an apparatus for manufacturing an organic light-emitting element having a prolonged service life. In a first embodiment, an organic light-emitting display device is provided that comprises a moisture capturing layer provided between an upper electrode and a lower electrode. In a second embodiment, an organic light-emitting apparatus is provided that comprises a metal substrate, an organic light-emitting element provided on the metal substrate, and an upper transparent electrode connected electrically to the metal substrate through a contact hole.Type: ApplicationFiled: June 15, 2009Publication date: May 5, 2011Inventors: Sukekazu Aratani, Kazuhito Masuda, Kotaro Araya, Hiroyuki Kagawa, Shintaro Takeda, Shingo Ishihara
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Patent number: 7909672Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.Type: GrantFiled: August 1, 2008Date of Patent: March 22, 2011Assignee: Hitachi, Ltd.Inventors: Shingo Ishihara, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
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Publication number: 20100276687Abstract: To provide an organic electroluminescent display device including an organic electroluminescent layer that can be easily fabricated under an atmosphere containing oxygen and which can achieve high efficiency. An organic electroluminescent display device includes a substrate, an organic electroluminescent layer, an upper electrode and a lower electrode sandwiching therein the organic electroluminescent layer, either one of the upper and lower electrodes being a transparent electrode, and the other being a reflecting electrode, and a charge transport layer disposed between the organic electroluminescent layer and the substrate. The charge transport layer is photo-cured by light with a wavelength longer than that of a near-ultraviolet light.Type: ApplicationFiled: December 19, 2008Publication date: November 4, 2010Inventors: Sukekazu Aratani, Hiroshi Sasaki, Kazuhito Masuda
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Publication number: 20100002173Abstract: An object of the present invention is to increase the dichroic ratio of the built-in polarizing layer in reflective regions so that the display performance improves in a semi-transmission type liquid crystal display device having a transmissive display portion and a reflective display portion.Type: ApplicationFiled: July 2, 2009Publication date: January 7, 2010Inventors: Miharu OTANI, Jun TANAKA, Kazuhito MASUDA, Masaya ADACHI, Takato HIRATSUKA
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Publication number: 20090153781Abstract: In a transflective liquid crystal display device including a transmission display portion and a reflection display portion, a dichroic ratio of a polarizing layer contained in a reflection region is increased to enhance display performance. The liquid crystal display device includes: the transmission display portion and the reflection display portion which are formed for each pixel; a reflective layer formed in the reflection display portion; a first substrate having a principal surface opposed to a liquid crystal layer; a second substrate opposed to the first substrate via the liquid crystal layer; and a polarizing layer formed above the reflective layer via an underlying layer thereof on the principal surface of the first substrate. The polarizing layer is made of chromonic liquid crystalline molecules, and an interface between the polarizing layer and the underlying layer has one of a siloxane structure and a silazane structure.Type: ApplicationFiled: December 17, 2008Publication date: June 18, 2009Inventors: Miharu Otani, Jun Tanaka, Kazuhito Masuda, Masaya Adachi, Takato Hiratsuka
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Patent number: 7525129Abstract: It is an object of the present invention to provide an organic light-emitting display of high light-emitting efficiency. The organic light-emitting element comprising a board, upper electrode, lower electrode, a plurality of light-emitting units placed between the upper and lower electrodes, and a charge-generating layer placed between a plurality of the light-emitting units, wherein one of the light-emitting units has a layer for emitting monochromatic light and one of the light-emitting units has a layer for emitting polychromatic light, the former unit having an equivalent or lower light-emitting efficiency than the latter unit.Type: GrantFiled: March 14, 2005Date of Patent: April 28, 2009Assignee: Hitachi Displays, Ltd.Inventors: Kazuhito Masuda, Shingo Ishihara, Sukekazu Aratani, Masaya Adachi
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Publication number: 20080299861Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.Type: ApplicationFiled: August 1, 2008Publication date: December 4, 2008Inventors: Shingo ISHIHARA, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
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Patent number: 7408197Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.Type: GrantFiled: February 1, 2005Date of Patent: August 5, 2008Assignee: Hitachi, Ltd.Inventors: Shingo Ishihara, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
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Publication number: 20060260679Abstract: The present invention is intended to provide a top emission type organic light emitting display device which prevents the organic film from being oxidized during the formation of the upper transparent electrode and can emit light at a low voltage. The top emission type organic light emitting display device includes: a substrate; an organic light emitting layer; and upper and lower electrodes sandwiching the organic light emitting layer, where the lower electrode is arranged between the substrate and the organic light emitting layer, the upper electrode is arranged on the opposite side of the substrate with respect to the lower electrode, light emitted from the organic light emitting layer is taken out from the upper electrode side, and an organic layer which is mainly composed of an organic material having a heterocyclic group containing one or more nitrogen atoms, is included between the organic light emitting layer and the upper electrode.Type: ApplicationFiled: May 18, 2006Publication date: November 23, 2006Inventors: Sukekazu Aratani, Hajime Murakami, Masao Shimizu, Kazuhito Masuda
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Patent number: 7002212Abstract: To prevent an n-channel thin-film transistor from being deteriorated by hot holes generated in a gate-negative pulse mode. A thin polysilicon film 10 is provided with a p-type semiconductor region 13 in contact with a channel region 14. The p-type semiconductor region 13 is electrically connected to nowhere except the channel region 14. Holes induced on the surface due to a gate-negative pulse are further supplied from the p-type semiconductor region 13. An electric field established by the gate-negative pulse is relaxed by the holes, fewer hot holes are injected into the gate oxide film, and the TFT characteristics are less deteriorated.Type: GrantFiled: July 22, 2003Date of Patent: February 21, 2006Assignee: Hitachi, Ltd.Inventors: Tatsuya Ohkubo, Genshiro Kawachi, Yoshiro Mikami, Kazuhito Masuda, Hiroshi Kageyama
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Publication number: 20050206305Abstract: It is an object of the present invention to provide an organic light-emitting display of high light-emitting efficiency. The organic light-emitting element comprising a board, upper electrode, lower electrode, a plurality of light-emitting units placed between the upper and lower electrodes, and a charge-generating layer placed between a plurality of the light-emitting units, wherein one of the light-emitting units has a layer for emitting monochromatic light and one of the light-emitting units has a layer for emitting polychromatic light, the former unit having an equivalent or lower light-emitting efficiency than the latter unit.Type: ApplicationFiled: March 14, 2005Publication date: September 22, 2005Inventors: Kazuhito Masuda, Shingo Ishihara, Sukekazu Aratani, Masaya Adachi
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Publication number: 20050127372Abstract: A scanning line, a signal line, a first current supply line, and a second current supply line are formed on a glass substrate, a first electrode is formed on the wiring layer comprising the above members, an organic layer comprising a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer is formed on the first electrode, a second electrode is formed as cathode on the electron injection layer, the first electrode as anode is connected to a plus terminal of a power source through the driving devices and the first current supply line, whereas the second electrode as cathode is connected to a minus terminal of the power source, and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby wiring resistance due to the second electrode is reduced, and variations in the brightness of a panel is reduced.Type: ApplicationFiled: February 1, 2005Publication date: June 16, 2005Inventors: Shingo Ishihara, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani
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Publication number: 20050078073Abstract: A liquid crystal display apparatus having a pair of substrates of which at least one substrate is transparent and a liquid crystal layer sandwiched between the substrates including a plurality of first scanning electrodes formed on one of the substrates, a plurality of signal electrodes intersecting in a matrix form with the plurality of first scanning electrodes, a plurality of second scanning electrodes provided along the first scanning electrodes or the signal electrodes. The display apparatus including within each of the regions surrounded by the plurality of first scanning electrodes and the plurality of signal electrodes: (a) a data holding circuit, signal electrode, and second scanning electrode, (b) a capacitor, (c) a switching device and (d) a display electrode. A drive voltage of the liquid crystal display apparatus is an alternating current voltage having a period which is shorter than a period of fetching by the display data holding circuit.Type: ApplicationFiled: December 3, 2004Publication date: April 14, 2005Inventors: Yoshiro Mikami, Tetsuro Minemura, Makoto Tsumura, Kazuhiro Kuwabara, Shinichi Komura, Tatsuya Ohkubo, Hideo Sato, Shoichi Hirota, Masaya Adachi, Kazuhito Masuda
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Patent number: 6864638Abstract: A scanning line, signal line, first current supply line, and second current supply line are formed on a glass substrate. A first electrode is formed thereon; and, an organic layer, including a hole transport layer, light-emitting layer, electron transport layer, and electron injection layer is formed on the first electrode. A second electrode is formed as a cathode on the electron injection layer. The first electrode, serving as an anode, is connected to a plus terminal of a power source through driving devices and first current supply line, whereas the second electrode is connected to a minus terminal of the power source and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby the wiring resistance of the second electrode is reduced, and variations in the brightness of the panel is reduced.Type: GrantFiled: December 31, 2002Date of Patent: March 8, 2005Assignee: Hitachi, Ltd.Inventors: Shingo Ishihara, Takayuki Ouchi, Toshiro Mikami, Kazuhito Masuda, Sukekazu Aratani