Patents by Inventor Takayuki Yanagawa

Takayuki Yanagawa 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).

  • Display driving circuit, display device, and display driving method
    Patent number: 8531443
    Abstract: Provided is a display driving circuit eliminating occurrence of lateral stripes in the first frame from which display corresponding to a video signal is started in CC driving premised on line inversion driving. A source bus line drive circuit outputs a source signal whose polarity is reversed in sync with horizontal scanning period for each row and whose polarity is opposite in an adjacent horizontal scanning period on the same row. A CS bus line drive circuit outputs, after the horizontal scanning period for each row, a CS signal with potential switched along a direction according to polarity of the source signal in the horizontal scanning period concerned. The CS bus line drive circuit outputs the CS signal in a first frame so that potential of the CS signal when the switching element on one row is switched is different from potential of a CS signal on an adjacent row.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: September 10, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takayuki Yanagawa, Atsushi Okada, Yasushi Sasaki
  • DISPLAY DRIVING CIRCUIT, DISPLAY DEVICE, AND DISPLAY DRIVING METHOD
    Publication number: 20110169790
    Abstract: The present invention eliminates, for CC driving based on line inversion driving, the appearance of lateral stripes in a first frame in which an image corresponding to a video signal starts to be displayed. The present invention includes: a gate line driving circuit (30) which outputs a gate signal for turning on switching element on a corresponding row for a corresponding one of horizontal scanning periods which are sequentially allocated to the respective rows; a source bus line driving circuit which outputs a source signal for switching between line inversion driving and frame inversion driving; and a CS bus line driving circuit (40) which outputs a CS signal having a potential which is, after the horizontal scanning period for the row, switched in a direction (that is, either (from the low level to the high level or from the high level to the low level) determined in accordance with the polarity of the source signal during the horizontal scanning period.
    Type: Application
    Filed: June 22, 2009
    Publication date: July 14, 2011
    Inventors: Takayuki Yanagawa, Atsushi Okada, Yasushi Sasaki
  • Process for preparing a mask for use in manufacturing a semiconductor device
    Patent number: 4068018
    Abstract: A process is disclosed for preparing a mask, such as a photo-mask, used in a selective etching process in the manufacture of a semiconductor device or a protective mask for use in a process for selectively providing a porous layer of silicon or for anodic oxidation of a metal layer, in which ions accelerated at a predetermined voltage are implanted into a photo-resist film to a predetermined dose level.
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: January 10, 1978
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Tadahiro Hashimoto, Yasushi Okuyama, Toshio Koguchi, Koji Wada, Mitsuru Sakamoto, Takayuki Yanagawa, Kyoji Yamamoto