Patents by Inventor Johannes K. Zelisse

Johannes K. Zelisse 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).

  • Addressing liquid crystal cells using bipolar data strobe pulses
    Patent number: 4728947
    Abstract: A method of addressing a matrix addressed ferroelectric liquid crystal cell is described that uses parallel entry of balanced bipolar data pulses on one set of electrodes to co-operate with serial entry of unipolar strobe pulses on the other set of electrodes. Data entry is preceded with blanking (erasing) pulses applied to the strobe lines. The polarity of the strobing and blanking pulses is periodically reversed to maintain charge balance in the long term.
    Type: Grant
    Filed: April 2, 1986
    Date of Patent: March 1, 1988
    Assignee: STC plc
    Inventors: Peter J. Ayliffe, Anthony B. Davey, Johannes K. Zelisse