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).

  • Publication number: 20060267006
    Abstract: 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: Application
    Filed: August 8, 2006
    Publication date: November 30, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, Masatoshi Wakagi
  • Publication number: 20060261334
    Abstract: Using a lower electrode as a photomask, a yophobic region having generally the same pattern as that of the lower electrode and a yophibic 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 yophobic 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: Application
    Filed: August 18, 2004
    Publication date: November 23, 2006
    Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, Masatoshi Wakagi
  • Patent number: 7112500
    Abstract: 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: Grant
    Filed: July 11, 2001
    Date of Patent: September 26, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Ando, Masahiro Kawasaki, Masatoshi Wakagi
  • Publication number: 20060209244
    Abstract: 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: Application
    Filed: May 22, 2006
    Publication date: September 21, 2006
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Patent number: 7102155
    Abstract: 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: Grant
    Filed: February 25, 2004
    Date of Patent: September 5, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, Masatoshi Wakagi
  • Patent number: 7045816
    Abstract: The present invention provides a thin film transistor, wherein the semiconductor channel region is patterned. Gate electrodes 102, gate insulating film 103, source electrodes 104, and drain electrodes 105 are formed on a glass substrate 101. A patterned insulating film is formed thereon, and a part of the film in the region 110 on the gate electrode is removed. An organic semiconductor film is formed thereon by vapor deposition. The organic semiconductor film 107 in the region 110, where the patterned insulating film is removed, becomes a channel region, and is separated from the organic semiconductor film 108 on the patterned insulating film 106. Therefore, the organic semiconductor channel region is patterned to have the same size as the gate electrode. In accordance with the present invention, a thin film transistor, wherein the semiconductor region is patterned precisely, becomes available.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: May 16, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Shingo Ishihara, Masatoshi Wakagi, Masahiko Ando
  • Publication number: 20050231457
    Abstract: 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: Application
    Filed: February 9, 2005
    Publication date: October 20, 2005
    Inventors: Tsunenori Yamamoto, Daisuke Kajita, Ikuo Hiyama, Akitoyo Konno, Tatsuki Inuzuka, Masatoshi Wakagi
  • Publication number: 20050051780
    Abstract: 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: Application
    Filed: October 21, 2004
    Publication date: March 10, 2005
    Inventors: Masahiko Ando, Masatoshi Wakagi, Hiroshi Sasaki
  • Publication number: 20050051770
    Abstract: 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: Application
    Filed: February 25, 2004
    Publication date: March 10, 2005
    Inventors: Masahiko Ando, Masaya Adachi, Hiroshi Sasaki, Masatoshi Wakagi
  • Patent number: 6828582
    Abstract: 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: Grant
    Filed: February 25, 2004
    Date of Patent: December 7, 2004
    Assignee: Hitachi Ltd.
    Inventors: Masahiko Ando, Masatoshi Wakagi, Hiroshi Sasaki
  • Publication number: 20040233377
    Abstract: A liquid crystal display device having a pair of substrates, a liquid crystal layer, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate surface, and a plurality of active elements connected to the electrodes, the group of electrodes and active elements being formed on one of the pair of substrates. An alignment control film is formed between the liquid crystal layer and at least one of the pair of substrates and is made from polyamic acid obtained by reacting a diamine with an acid anhydride.
    Type: Application
    Filed: June 24, 2004
    Publication date: November 25, 2004
    Inventors: Yuka Utsumi, Yasushi Tomioka, Masatoshi Wakagi, Yasunari Maekawa, Sukekazu Aratani, Katsumi Kondo, Shigeru Matsuyama
  • Publication number: 20040135763
    Abstract: An electrophoretic display comprising a first and second substrates each being disposed with a predetermined gap therebetween; a layer comprising an insulating solvent and charged particles dispersed in the insulating solvent, the layer being sandwiched between the substrates; a first electrode disposed on one of the substrates; and a second electrode disposed on the second substrate, wherein the second electrode has a reflector with uneven surface.
    Type: Application
    Filed: July 24, 2003
    Publication date: July 15, 2004
    Inventors: Hiroki Kaneko, Shoichi Hirota, Tetsuya Ooshima, Masatoshi Wakagi, Shinichi Komura
  • Patent number: 6757044
    Abstract: A normally closed liquid crystal display device using an in-plane switching mode prevented from light leakage caused by spacer beads and having a high contrast ratio can be produced by making a pretilt angle between an alignment control film and liquid crystals 4° or less and controlling a light leakage centering the spacer in 4-divided shapes; or by placing a film provided with a liquid crystal alignment controlling function by irradiation with polarized light between the spacer and a liquid crystal layer, the spacer being present in a pair of substrates.
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: June 29, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Yasushi Tomioka, Masatoshi Wakagi, Yasunari Maekawa, Sukekazu Aratani, Katsumi Kondo, Shigeru Matsuama
  • Publication number: 20040104461
    Abstract: The present invention provides a thin film transistor, wherein the semiconductor channel region is patterned. Gate electrodes 102, gate insulating film 103, source electrodes 104, and drain electrodes 105 are formed on a glass substrate 101. A patterned insulating film is formed thereon, and a part of the film in the region 110 on the gate electrode is removed. An organic semiconductor film is formed thereon by vapor deposition. The organic semiconductor film 107 in the region 110, where the patterned insulating film is removed, becomes a channel region, and is separated from the organic semiconductor film 108 on the patterned insulating film 106. Therefore, the organic semiconductor channel region is patterned to have the same size as the gate electrode. In accordance with the present invention, a thin film transistor, wherein the semiconductor region is patterned precisely, becomes available.
    Type: Application
    Filed: July 1, 2003
    Publication date: June 3, 2004
    Inventors: Shingo Ishihara, Masatoshi Wakagi, Masahiko Ando
  • Publication number: 20040085506
    Abstract: 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: Application
    Filed: October 28, 2003
    Publication date: May 6, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Patent number: 6704085
    Abstract: A liquid crystal display apparatus which has a large pixel aperture ratio, a high luminance and good yield without causing any signal delay on wiring or increasing any driving voltage. In a structure in which a capacity is formed on a superimposed part of a common signal electrode CE and at least one of a data signal wiring DL and a scanning signal wiring GL via an interlayer insulating film PAS, of insulating films included in the interlayer insulating film PAS, at least a layer OIL1 is selectively formed at least on a part of a region on a pixel electrode PX.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: March 9, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Etsuko Nishimura, Makoto Abe, Masatoshi Wakagi, Ken-ichi Onisawa, Kenji Okishiro, Yoshiaki Nakayoshi, Masahiro Ishii, Junji Tanno
  • Patent number: 6600524
    Abstract: An improved liquid crystal display apparatus for low power consumption has a thin film transistor as a switching device. The thin film transistor has a gate insulating layer of laminated film of silicon nitride and silicon oxide, a semiconductor layer, a drain electrode and a source electrode, and supplementary insulating layer, laminated in order on the gate electrode. The supplementary insulating layer includes a portion of silicon oxide formed by oxidizing a surface of the semiconductor layer.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: July 29, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Ando, Masatoshi Wakagi
  • Patent number: 6593977
    Abstract: The present invention provides a thin film transistor, wherein the semiconductor channel region is patterned. Gate electrodes 102, gate insulating film 103, source electrodes 104, and drain electrodes 105 are formed on a glass substrate 101. A patterned insulating film is formed thereon, and a part of the film in the region 110 on the gate electrode is removed. An organic semiconductor film is formed thereon by vapor deposition. The organic semiconductor film 107 in the region 110, where the patterned insulating film is removed, becomes a channel region, and is separated from the organic semiconductor film 108 on the patterned insulating film 106. Therefore, the organic semiconductor channel region is patterned to have the same size as the gate electrode. In accordance with the present invention, a thin film transistor, wherein the semiconductor region is patterned precisely, becomes available.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: July 15, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Shingo Ishihara, Masatoshi Wakagi, Masahiko Ando
  • Patent number: 6507383
    Abstract: A liquid crystal display unit in which a voltage is applied to a pixel electrode and a common signal electrode constituted by two upper and lower transparent conductive layers having insulation layers disposed therebetween so that a liquid crystal is driven to control display can improve any one or both of reduction of a writing time of the liquid crystal (reduction of a capacitance between the pixel electrode and the common signal electrode) and reduction of a driving voltage of the liquid crystal. An inter-layer insulation layer between the transparent electrodes formed of different layers is constituted by at least one or a laminated structure of a part of a gate insulation layer, a part of a surface protection layer of a thin film transistor and an applied-type insulation layer and insulation layers in an area which is positioned above the lower transparent electrode.
    Type: Grant
    Filed: June 29, 2000
    Date of Patent: January 14, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Abe, Etsuko Nishimura, Kikuo Ono, Yoshiaki Nakayoshi, Masatoshi Wakagi
  • Publication number: 20030002005
    Abstract: A normally closed liquid crystal display device using an in-plane switching mode prevented from light leakage caused by spacer beads and having a high contrast ratio can be produced by making a pretilt angle between an alignment control film and liquid crystals 4° or less and controlling a light leakage centering the spacer in 4-divided shapes; or by placing a film provided with a liquid crystal alignment controlling function by irradiation with polarized light between the spacer and a liquid crystal layer, the spacer being present in a pair of substrates.
    Type: Application
    Filed: July 8, 2002
    Publication date: January 2, 2003
    Inventors: Yuka Utsumi, Yasushi Tomioka, Masatoshi Wakagi, Yasunari Maekawa, Sukekazu Aratani, Katsumi Kondo, Shigeru Matsuama