Patents by Inventor Genshiro Kawachi

Genshiro Kawachi 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).

  • Patent number: 7492361
    Abstract: There are provided a display apparatus and a display method, with which compressed image data that is to be decompressed can be transmitted to the display apparatus in an environment in which a transmission capacity is not always secured, and good image display is realized. An example of the display apparatus is an active matrix display apparatus formed by using thin-film transistors formed on an insulating substrate. In the active matrix display apparatus, a circuit that receives an image data signal from an external system via a non-contact transmission path and amplifies the image data signal, a circuit that processes the image data signal, and a memory circuit that stores the processed image data are integrated on the insulating substrate.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: February 17, 2009
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventors: Genshiro Kawachi, Hiroyuki Abe, Kunihiro Asada, Makoto Ikeda
  • Publication number: 20090044161
    Abstract: A thin-film transistor circuit includes a crystallized semiconductor thin film two-dimensionally partitioned into crystal-grain-defining areas each of which accommodates a crystal grain larger than a predetermined size, thin-film transistors each of which has a channel region placed at the center position of a corresponding one of the crystal-grain-defining areas, and wirings which interconnect the thin-film transistors.
    Type: Application
    Filed: October 7, 2008
    Publication date: February 12, 2009
    Inventor: Genshiro KAWACHI
  • Publication number: 20090040414
    Abstract: A liquid crystal display includes a pair of support substrates, a liquid crystal layer held between the substrates, and pixel circuits that are arrayed in a matrix on one of the substrates and control the alignment state of liquid crystal molecules. Each pixel circuit includes first and second power terminals, first and second pixel electrodes that apply a liquid crystal drive voltage to the liquid crystal layer to create a substantially lateral electric field, and first and second drive transistors that have gate electrodes for receiving a video signal, that are connected between the first power terminal and the first pixel electrode and between the second power terminal and the second pixel electrode, respectively, and that cause the liquid crystal drive voltage determined by conductances that vary in accordance with the video signal, to be retained in a liquid crystal capacitance between the first and second pixel electrodes.
    Type: Application
    Filed: October 14, 2008
    Publication date: February 12, 2009
    Inventor: Genshiro KAWACHI
  • Patent number: 7485505
    Abstract: The present invention provides a thin-film transistor offering a higher electron (or hole) mobility, a method for manufacturing the thin-film transistor, and a display using the thin-film transistor. The present invention provides a thin-film transistor having a source region, a channel region, and a drain region in a semiconductor thin film with a crystal grown in a horizontal direction, the thin-film transistor having a gate insulating film and a gate electrode over the channel region, wherein a drain edge of the drain region which is adjacent to the channel region is formed in the vicinity of a crystal growth end position.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: February 3, 2009
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventors: Yoshiaki Nakazaki, Genshiro Kawachi, Terunori Warabisako, Masakiyo Matsumura
  • Publication number: 20090009440
    Abstract: A self-luminescence display device, in which dispersion in display among a plurality of pixels, caused by dispersion in characteristics among drive thin-film transistors, is decreased and uniform display free of unevenness can be obtained. The device includes a plurality of pixels having current drive type luminescent elements, and parallel-connected n (n?2) thin-film transistors to feed a drive current to the respective current drive type luminescent elements. The transistors are arranged in different pixels, respectively, for example, in a first region of pixels adjacent to one another along a first direction. A second region of dummy pixels can be provided on at least one side of said first region along said first direction.
    Type: Application
    Filed: April 18, 2008
    Publication date: January 8, 2009
    Inventors: Genshiro KAWACHI, Toshihiro Sato, Shigeyuki Nishitani, Naoki Tokuda
  • Patent number: 7468719
    Abstract: A liquid crystal display includes a pair of support substrates, a liquid crystal layer held between the substrates, and pixel circuits that are arrayed in a matrix on one of the substrates and control the alignment state of liquid crystal molecules. Each pixel circuit includes first and second power terminals, first and second pixel electrodes that apply a liquid crystal drive voltage to the liquid crystal layer to create a substantially lateral electric field, and first and second drive transistors that have gate electrodes for receiving a video signal, that are connected between the first power terminal and the first pixel electrode and between the second power terminal and the second pixel electrode, respectively, and that cause the liquid crystal drive voltage determined by conductances that vary in accordance with the video signal, to be retained in a liquid crystal capacitance between the first and second pixel electrodes.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: December 23, 2008
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventor: Genshiro Kawachi
  • Patent number: 7464364
    Abstract: A thin-film transistor circuit includes a crystallized semiconductor thin film two-dimensionally partitioned into crystal-grain-defining areas each of which accommodates a crystal grain larger than a predetermined size, thin-film transistors each of which has a channel region placed at the center position of a corresponding one of the crystal-grain-defining areas, and wirings which interconnect the thin-film transistors.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: December 9, 2008
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventor: Genshiro Kawachi
  • Publication number: 20080283843
    Abstract: A method of receiving video data, a control signal, etc. via a non-contact transmission path is adopted, and a receiving circuit for receiving and amplifying a signal is formed on the same insulating substrate as a display device. Thus, there are provided a thin-film transistor which is formed in a semiconductor thin film that is formed on the insulating substrate and crystallized in a predetermined direction, and an inductor for forming an inductive-coupling circuit, which is formed by using an electrically conductive thin film provided on the insulating substrate. The direction of movement of carriers flowing in the thin-film transistor is parallel to the direction of crystallization of the semiconductor thin film, and the inductor and the thin-film transistor are integrated so as to be electrically coupled directly or indirectly.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 20, 2008
    Inventor: Genshiro KAWACHI
  • Patent number: 7425940
    Abstract: A liquid crystal display includes a pair of support substrates, a liquid crystal layer, and pixel circuits that are arrayed in a matrix and control the alignment state of liquid crystal molecules. Each pixel circuit includes two power terminals set at potentials of opposite polarities, each potential having a predetermined level difference relative to a reference potential, two pixel electrodes that retain charges supplied from the power terminals and apply a potential difference obtained by the retained charges to the liquid crystal layer as a liquid crystal drive voltage, an input transistor that includes a gate electrode, which receives a video signal, and redistributes the charges retained in the pixel electrodes in accordance with the video signal, and a switch circuit that connects the pixel electrodes to the power terminals and connects the pixel electrodes to one and the other of the source and drain electrodes of the input transistor.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: September 16, 2008
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventor: Genshiro Kawachi
  • Patent number: 7419860
    Abstract: A crystalline semiconductor having an even surface and a large crystal grain size is formed on an economical glass substrate using a laser crystallizing technology. A series of processes, including forming an insulation film on a glass substrate; forming a semiconductor film in the first layer; crystallizing the semiconductor film in the first layer by irradiating laser light stepwise from weak energy laser light to strong energy laser light; forming a semiconductor film in a second layer having a film thickness thinner than that of the semiconductor film in the first layer; performing laser crystallization of the semiconductor thin film in the second layer by irradiating laser light stepwise from weak energy laser light to strong energy laser light, are continuously performed without exposing the workpiece to the atmosphere.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: September 2, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Youmei Shinagawa, Akio Mimura, Genshiro Kawachi, Takeshi Satoh
  • Publication number: 20080044975
    Abstract: The present invention provides a thin-film transistor offering a higher electron (or hole) mobility, a method for manufacturing the thin-film transistor, and a display using the thin-film transistor. The present invention provides a thin-film transistor having a source region, a channel region, and a drain region in a semiconductor thin film with a crystal grown in a horizontal direction, the thin-film transistor having a gate insulating film and a gate electrode over the channel region, wherein a drain edge of the drain region which is adjacent to the channel region is formed in the vicinity of a crystal growth end position.
    Type: Application
    Filed: September 14, 2007
    Publication date: February 21, 2008
    Inventors: Yoshiaki NAKAZAKI, Genshiro Kawachi, Terunori Warabisako, Masakiyo Matsumura
  • Publication number: 20080042152
    Abstract: An integrated circuit, which is configured such that a MOS transistor and a bipolar transistor are integrated at the same time, is formed on an insulating substrate which includes a display device. An electronic device or a display includes a plurality of semiconductor devices which are formed by using a semiconductor thin film and are formed in the semiconductor thin film that is provided on an insulating substrate and is crystallized in a predetermined direction. The plurality of semiconductor devices include a MOS transistor and at least either one of a lateral bipolar thin-film transistor and a MOS-bipolar hybrid thin film transistor.
    Type: Application
    Filed: August 6, 2007
    Publication date: February 21, 2008
    Inventor: Genshiro KAWACHI
  • Publication number: 20080006826
    Abstract: In a lateral bipolar transistor including an emitter, a base and a collector which are formed in a semiconductor thin film formed on an insulating substrate, the semiconductor thin film is a semiconductor thin film which is crystallized in a predetermined direction. In addition, in a MOS-bipolar hybrid transistor formed in a semiconductor thin film formed on an insulating substrate, the semiconductor thin film is a semiconductor thin film which is crystallized in a predetermined direction.
    Type: Application
    Filed: June 11, 2007
    Publication date: January 10, 2008
    Inventor: Genshiro KAWACHI
  • Patent number: 7309900
    Abstract: There is provided a thin-film transistor that is formed on an insulating substrate, is capable of a high-speed operation, has small non-uniformity among devices, is hardly susceptible to device destruction due to high voltage, and is free from the effect of a parasitic transistor that forms at an edge part of an Si island. The thin-film semiconductor device is formed using a thin-film semiconductor provided on the insulating substrate and includes a gate region for formation of a channel region through which a drain current flows. The gate region has a ring shape in plan on the insulating substrate. High concentration impurity-doped regions are dividedly provided on an inside and an outside of the ring-shaped gate region, and the channel region is formed of a plurality of fan-shaped semiconductor single-crystal portions.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: December 18, 2007
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventors: Fumiki Nakano, Genshiro Kawachi, Yoshiaki Nakazaki, Shinzo Tsuboi, Takahiko Endo, Tomoya Kato
  • Patent number: 7288787
    Abstract: The present invention provides a thin-film transistor offering a higher electron (or hole) mobility, a method for manufacturing the thin-film transistor, and a display using the thin-film transistor. The present invention provides a thin-film transistor having a source region, a channel region, and a drain region in a semiconductor thin film with a crystal grown in a horizontal direction, the thin-film transistor having a gate insulating film and a gate electrode over the channel region, wherein a drain edge of the drain region which is adjacent to the channel region is formed in the vicinity of a crystal growth end position.
    Type: Grant
    Filed: July 3, 2006
    Date of Patent: October 30, 2007
    Assignee: Advanced LCD Technologies Development Center Co., Ltd.
    Inventors: Yoshiaki Nakazaki, Genshiro Kawachi, Terunori Warabisako, Masakiyo Matsumura
  • Publication number: 20070228469
    Abstract: There is provided a thin-film transistor that is formed on an insulating substrate, is capable of a high-speed operation, has small non-uniformity among devices, is hardly susceptible to device destruction due to high voltage, and is free from the effect of a parasitic transistor that forms at an edge part of an Si island. The thin-film semiconductor device is formed using a thin-film semiconductor provided on the insulating substrate and includes a gate region for formation of a channel region through which a drain current flows. The gate region has a ring shape in plan on the insulating substrate. High concentration impurity-doped regions are dividedly provided on an inside and an outside of the ring-shaped gate region, and the channel region is formed of a plurality of fan-shaped semiconductor single-crystal portions.
    Type: Application
    Filed: June 5, 2007
    Publication date: October 4, 2007
    Inventors: Fumiki Nakano, Genshiro Kawachi, Yoshiaki Nakazaki, Shinzo Tsuboi, Takahiko Endo, Tomoya Kato
  • Publication number: 20070216290
    Abstract: An organic EL light emitting display device is provided which includes a matrix array having a plurality of pixel circuits, each including an organic light emitting element. A scan driving circuit and a current supply circuit are coupled to the pixel circuits. In addition, a plurality of pads are provided which are adapted to connect the scan driving circuit and the current supply circuit to external circuits. In accordance with one embodiment, the pads are located to be closer to the current supply circuit than to the scan driving circuit.
    Type: Application
    Filed: May 15, 2007
    Publication date: September 20, 2007
    Inventors: Genshiro Kawachi, Toshihiro Sato, Masaaki Okunaka, Noaki Tokuda
  • Publication number: 20070200805
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Application
    Filed: May 1, 2007
    Publication date: August 30, 2007
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Patent number: 7230592
    Abstract: In an organic electroluminescent light emitting display device comprising a plurality of pixels each of which includes an organic electroluminescent element emitting light by a current supplied thereto, a plurality of active elements including a first active element which acquires a data signal and a second active element which regulates the current supplied to the organic electroluminescent element in accordance with the data signal, and a capacitive element storing the data signal, the present invention utilizes a part of the capacitive element arranged in one of the pixels for a light shielding member which shields the plurality of active elements arranged the one of the pixels from light emitted by the organic electroluminescent element arranged therein or another pixel adjacent thereto so as to suppress image quality deterioration and smear appearing in an image display area of the organic electroluminescent light emitting display device.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: June 12, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Toshihiro Sato, Genshiro Kawachi, Yoshiro Mikami, Masaya Adachi
  • Patent number: RE39798
    Abstract: A liquid crystal display device and a manufacturing method therefor are provided where the number of processes for manufacturing TFT substrates can be decreased and a high production yield can be attained. To attain these objects, an image signal bus-line includes at least a transparent conductive film and a semiconductor layer. A pattern of the transparent conductive film extends up to a thin film transistor to form its drain electrode, and a pattern of a semiconductor layer extends up to the transistor to form its source electrode. By virtue of these arrangements, the thin film transistor substrate can be manufactured using as little as three or four photolithography processes.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: August 28, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Kikuo Ono, Kazuhiro Ogawa, Takashi Suzuki, Kouichi Anno, Hiroki Sakuta, Makoto Tsumura, Masaaki Kitajima, Genshiro Kawachi