Patents by Inventor Masatoshi Wakagi
Masatoshi Wakagi 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: 20100214524Abstract: 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 29, 2010Publication date: August 26, 2010Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
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Publication number: 20100200858Abstract: A display device includes a plurality of thin-film transistors formed on a substrate on which a display area is formed. At least one of the plurality of thin-film transistors includes a gate electrode, agate insulating film formed to cover the gate electrode, an interlayer insulating film formed on an upper surface of the gate insulating film and having an opening formed in an area where the gate electrode is formed in plan view, a pair of heavily-doped semiconductor films arranged on an upper surface of the interlayer insulating film with the opening interposed therebetween, a polycrystalline semiconductor film formed across the opening and formed in the area, the polycrystalline semiconductor film being electrically connected to the pair of heavily-doped semiconductor films, and a pair of electrodes formed to overlap the pair of heavily-doped semiconductor films, respectively, without overlapping the polycrystalline semiconductor film.Type: ApplicationFiled: February 9, 2010Publication date: August 12, 2010Inventors: Yoshiaki Toyota, Mieko Matsumura, Masatoshi Wakagi
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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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Patent number: 7655947Abstract: The present invention provides a thin film transistor comprising a drain electrode and a source electrode separated by a channel region formed over a contact portion with an amorphous silicon layer and wherein an impurity from the channel region is removed and a remaining impurity is diffused into the contact portion to form a contact layer wherein the contact layer has a second resistance at least lower than the first resistance.Type: GrantFiled: August 14, 2006Date of Patent: February 2, 2010Assignee: Hitachi, Ltd.Inventors: Masahiko Ando, Masahiro Kawasaki, Masatoshi Wakagi
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Patent number: 7595784Abstract: The liquid crystal display apparatus includes a liquid crystal display, a backlight unit for emitting rays of light of three or more colors, the ray of each color being controlled, and applying these rays of light onto the liquid crystal display. A controller is further provided for controlling a change of display data of each color of the liquid crystal display and an emitted light quantity of each color of the backlight unit at a time, based on a video signal being inputted for displaying the corresponding image and an output signal sent from an ambient light sensor for sensing ambient light.Type: GrantFiled: February 9, 2005Date of Patent: September 29, 2009Assignee: Hitachi Displays, Ltd.Inventors: Tsunenori Yamamoto, Daisuke Kajita, Ikuo Hiyama, Akitoyo Konno, Tatsuki Inuzuka, Masatoshi Wakagi
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Publication number: 20090146930Abstract: Each TFT for driving each of a plurality of pixels arranged in a matrix-like configuration is configured using a stagger-type polycrystalline-Si TFT. A gate electrode, which is composed of a high-heat-resistant material capable of resisting high temperature at the time of polycrystalline-Si film formation, is disposed at a lower layer as compared with the polycrystalline-Si layer that forms a channel of each TFT. A gate line, which is composed of a low-resistance material, is disposed at an upper layer as compared with the polycrystalline-Si layer. The gate electrode and the gate line are connected to each other via a through-hole bored in a gate insulation film. Respective configuration components of each organic electro-luminescent element are partially co-used at the time of the line formation, thereby suppressing an increase in the steps, processes, and configuration components.Type: ApplicationFiled: November 21, 2008Publication date: June 11, 2009Inventors: Etsuko NISHIMURA, Masatoshi Wakagi, Kenichi Onisawa, Mieko Matsumura
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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: 7521716Abstract: Using a lower electrode as a photomask, a lyophobic region having generally the same pattern as that of the lower electrode and a lyophilic region having a pattern which is generally the inversion of the lower electrode pattern are formed on an insulating film. A conductive ink is applied to the lyophobic region and baked. Thus, an upper electrode having a pattern which is generally the inversion of the lower electrode pattern is formed in a self-alignment manner. Therefore no misalignment occurs even if a printing method is used. Thus, a semiconductor device such as an active-matrix thin-film transistor substrate can be fabricated by using a printing method.Type: GrantFiled: August 18, 2004Date of Patent: April 21, 2009Assignee: Hitachi, Ltd.Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, Masatoshi Wakagi
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Publication number: 20080258148Abstract: In a thin film transistor, a semiconductor layer containing Si and Ge is applied, a Ge concentration of this semiconductor layer is high at the side of the insulating substrate, and crystalline orientation of the semiconductor layer indicates a random orientation in a region of 20 nm from the side of the insulating substrate, and indicates a (111), (110) or (100) preferential orientation at the film surface side of the semiconductor layer.Type: ApplicationFiled: January 24, 2008Publication date: October 23, 2008Inventors: Masatoshi WAKAGI, Junichi Hanna
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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: 7407846Abstract: The present method prevents malfunctions in switching caused by a light leakage current in an active matrix type thin film transistor substrate for a liquid crystal display and prevents display failures, by selectively disposing a self assembled monolayer film in a gate electrode-projected region of the surface of an insulator film with high definition, and by selectively improving the orientation order of an organic semiconductor film only in the gate electrode-projected region without improving the order at an irradiated portion with light outside the gate electrode-projected region.Type: GrantFiled: February 8, 2007Date of Patent: August 5, 2008Assignee: Hitachi, Ltd.Inventors: Masahiko Ando, Masatoshi Wakagi, Hiroshi Sasaki
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Patent number: 7394095Abstract: In the present invention, a lower electrode is utilized as a photomask to form a liquid-repellent region having a generally same pattern shape as that of the lower electrode and a liquid-attracting region having a generally reversed pattern shape on an insulating film. A conductive ink is coated and calcined in the liquid-attracting region to form an upper electrode having a generally reversed pattern shape to the lower electrode in a self-aligned manner, eliminating the occurrence of misregistration even when a printing method is used. Consequently, semiconductor devices such as an active matrix thin film transistor substrate can be formed using a printing method.Type: GrantFiled: August 8, 2006Date of Patent: July 1, 2008Assignee: Hitachi, Ltd.Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, 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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Publication number: 20070126003Abstract: The present method prevents malfunctions in switching caused by a light leakage current in an active matrix type thin film transistor substrate for a liquid crystal display and prevents display failures, by selectively disposing a self assembled monolayer film in a gate electrode-projected region of the surface of an insulator film with high definition, and by selectively improving the orientation order of an organic semiconductor film only in the gate electrode-projected region without improving the order at an irradiated portion with light outside the gate electrode-projected region.Type: ApplicationFiled: February 8, 2007Publication date: June 7, 2007Applicant: HITACHI, LTD.Inventors: Masahiko ANDO, Masatoshi WAKAGI, Hiroshi SASAKI
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Patent number: 7202496Abstract: The present method prevents malfunctions in switching caused by a light leakage current in an active matrix type thin film transistor substrate for a liquid crystal display and prevents display failures, by selectively disposing a self assembled monolayer film in a gate electrode-projected region of the surface of an insulator film with high definition, and by selectively improving the orientation order of an organic semiconductor film only in the gate electrode-projected region without improving the order at an irradiated portion with light outside the gate electrode-projected region.Type: GrantFiled: October 21, 2004Date of Patent: April 10, 2007Assignee: Hitachi, Ltd.Inventors: Masahiko Ando, Masatoshi Wakagi, Hiroshi Sasaki
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Publication number: 20070070020Abstract: A shift register circuit which stably operates with low electric power consumption and can realize a long life. In the shift register circuit constructed by connecting a plurality of fundamental circuits in each of which fundamental clocks of three phases are inputted to input terminals and is constructed by a gate line driving circuit, a timing control circuit, and a holding device control circuit, each of the gate line driving circuit and the timing control circuit has charging devices and holding devices. A node is stabilized by the timing control circuit.Type: ApplicationFiled: September 26, 2006Publication date: March 29, 2007Inventors: Susumu Edo, Shinichi Komura, Masatoshi Wakagi
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Publication number: 20060275994Abstract: The present invention provides a thin film transistor comprising a drain electrode and a source electrode separated by a channel region formed over a contact portion with an amorphous silicon layer and wherein an impurity from the channel region is removed and a remaining impurity is diffused into the contact portion to form a contact layer wherein the contact layer has a second resistance at least lower than the first resistance.Type: ApplicationFiled: August 14, 2006Publication date: December 7, 2006Applicant: Hitachi, Ltd.Inventors: Masahiko Ando, Masahiro Kawasaki, Masatoshi Wakagi
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Patent number: 7145176Abstract: An active matrix display device using a thin film transistor as a switching element in the displaying portion or driving portion is characterized in that said thin film transistor includes an insulating substrate on which a gate electrode, a gate insulating film, a semiconductor layer, a drain electrode, a source electrode and a passivation film are successively laminated. The thin film transistor is further characterized such that the surface portion of the semiconductor layer on the side of the passivation film is porous, which enables the device to be stably driven with a low off-current even in the case of disposing an organic passivation film and a picture element electrode on the thin film transistor.Type: GrantFiled: August 29, 2001Date of Patent: December 5, 2006Assignee: Hitachi, Ltd.Inventors: Masahiro Kawasaki, Masahiko Ando, Masatoshi Wakagi