Patents by Inventor Hiroaki Ikejiri

Hiroaki Ikejiri 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: 4743096
    Abstract: The present invention provides, in an active matrix liquid crystal display device of the type including non-linear elements, for the application of an ON pulse-width modulation signal by the data line driving circuit at the rearward end of each selected period, during which the voltage corresponding to the duty-cycle of the selected signal is applied to the liquid crystal layer. The result is accurate reproduction of gray-scale images in the display under conditions of high duty-cycle driving. Further, cross-talk between columns caused by the data signal is controlled by supplying a signal voltage which eliminates the residual charges in the liquid crystal layer at the end of each selected period.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: May 10, 1988
    Assignee: Seiko Epson Kabushiki Kaisha
    Inventors: Yoichi Wakai, Satoru Yazawa, Hiroaki Ikejiri, Yoshiro Uchikawa, Masahide Isuda
  • Patent number: 4556905
    Abstract: After an external vertical sync signal is inputted, a divider circuit counts a predetermined number of clock pulses and delivers a vertical sync signal and a control signal allowing the external signal to pass through a gate circuit. The external vertical sync signal passing through the gate circuit resets the counter and a control signal from a detector circuit blocks the gate circuit until the counter delivers the next control signal. The divider circuit delivers a vertical sync pulse with proper timing and resets itself if the external signal is weak or absent.
    Type: Grant
    Filed: November 10, 1983
    Date of Patent: December 3, 1985
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventor: Hiroaki Ikejiri