Patents by Inventor William Keith Bertram

William Keith Bertram 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).

  • Illumination intensity control in electroluminescent display
    Patent number: 6541921
    Abstract: A controller for controlling the intensity of an electroluminescent display is disclosed. The controller controls a number of skipped cycles in a cycle set of an applied waveform to the electroluminescent display to vary the average duty cycle, and thereby adjust the intensity of the electroluminescent display. The controller is further configured to adjust the intensity of individual channels within the electroluminescent display to provide compensation for display aging, color variation, as well as for varying intensity for various operating modes.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: April 1, 2003
    Assignee: Sierra Design Group
    Inventors: Robert Anthony Luciano, Jr., William Keith Bertram, Alexander Prokop, Richard Louis Hicksted