Patents by Inventor Kouiti Yamada

Kouiti Yamada 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: 20050212787
    Abstract: In an active matrix display apparatus, the drive transistor to drive an OLED self-corrects the operation timing of the drive transistor. A correction transistor controls on and off of the self-correction. The drive circuit self-corrects the operation of the drive transistor by generating a luminance signal which is corrected based on a predetermined signal delivered temporarily and an operation threshold value. The current flowing to the OLED is controlled by gradually changing the voltage of luminance signal from a ramp signal line. After the luminance signal for one frame is inputted to each pixel, the same luminance signal for one frame is inputted to the each pixel in a reversed scanning direction. One frame period is divided into a plurality of subframe periods and the data control circuit inputs respectively the same luminance signal to each pixel in the plurality of subframe periods.
    Type: Application
    Filed: March 21, 2005
    Publication date: September 29, 2005
    Inventors: Yukihiro Noguchi, Satoru Sekine, Kouiti Yamada, Shoichiro Matsumoto