Patents by Inventor Ewen R. M. Huffman

Ewen R. M. Huffman 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 driving systems
    Patent number: 4893117
    Abstract: A drive circuit for a liquid crystal display uses a sampling technique to derive drive signals from a pair of input waveforms. The waveforms comprise positive going and negative going trapezoidal pulses. By sampling the waveforms at appropriate points, single cycle AC signals and zero voltage signals can be provided. The technique subjects the drive circuit to a voltage stress that is lower than that provided by conventional techniques.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: January 9, 1990
    Assignee: STC PLC
    Inventors: Peter F. Blomley, Peter J. Ayliffe, Ewen R. M. Huffman, Gregory W. M. Yuen