Patents by Inventor Yozo Nakayasu

Yozo Nakayasu 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).

  • Liquid crystal display device
    Patent number: 7683874
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: March 23, 2010
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Liquid crystal display device
    Publication number: 20080036723
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Application
    Filed: September 28, 2007
    Publication date: February 14, 2008
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Liquid crystal display device
    Patent number: 7292215
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: November 6, 2007
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Liquid crystal display device
    Patent number: 6862015
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: March 1, 2005
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Liquid crystal display device
    Publication number: 20040046727
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Application
    Filed: September 2, 2003
    Publication date: March 11, 2004
    Applicant: Hitachi, Ltd and Hitachi Device Engineering Co., Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito
  • Liquid crystal display device having an improved video line driver circuit
    Patent number: 6556182
    Abstract: A liquid crystal display element having pixels, video signal lines applying a video signal voltage to the pixels and a video signal line driver supplying the video signal voltages to the video signal lines. The video signal line driver circuit includes a gray-scale voltage generating circuit provided with a resistor circuit dividing voltages between plural gray-scale reference voltages to generate plural gray-scale voltages, and selector circuits selecting one gray-scale voltage in accordance with the display data. The resistor circuit includes a resistive element provided with plural Intermediate taps for dividing voltages to generate the gray-scale voltages, gray-scale voltage lines corresponding to the gray-scale voltages, an interlayer insulating film insulating the gray-scale lines from the resistive element, and connections connecting the gray-scale voltage lines to corresponding ones of the intermediate taps through a hole in the interlayer insulating film.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: April 29, 2003
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd., Hitachi ULSI Systems Co., Ltd.
    Inventors: Mitsuru Goto, Yozo Nakayasu, Shinji Yasukawa, Kentaro Agata, Yuji Yamashita, Koichi Kotera
  • Liquid crystal display device having a wide dynamic range driver
    Patent number: 6417827
    Abstract: A MOS transistor (M1) which is arranged in the highest order of a low Vth MOS transistor grayscale group of a decoder circuit of a drain driver is formed of a CMOS transistor, to prevent a current from flowing from an output side into the low Vth MOS transistor portion owing to a grayscale voltage applied to another portion.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: July 9, 2002
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Shoji Nagao, Takahiro Fujioka, Mitsuru Goto, Kazunari Saito, Shinji Yasukawa, Yozo Nakayasu, Kentaro Agata
  • Liquid crystal display device
    Publication number: 20010054997
    Abstract: A liquid crystal display device capable of improving display quality by enabling proper execution of receipt and acceptance of image signals through compensation for variation in duty ratios of clock signals as input to liquid crystal driver circuitry, is provided.
    Type: Application
    Filed: April 18, 2001
    Publication date: December 27, 2001
    Applicant: Hitachi, Ltd.
    Inventors: Takahiro Fujioka, Shigeru Ito, Mitsuru Goto, Yozo Nakayasu, Yoshiyuki Saito