Patents Examined by Michael Razaus
  • Power supply for electroluminescent panel
    Patent number: 4859911
    Abstract: A very efficient and compact circuit is provided to power an electroluminescent panel as may be used for back lighting liquid crystal displays in portable computers. The capacitance of the electroluminescent panel is incorporated in a series resonant, self-commutating power oscillator. The power oscillator is powered by a DC-to-DC converter and inherently provides the desired sinusoidal output waveform to the reactive load comprising the capacitance of the electroluminescent panel.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: August 22, 1989
    Assignee: International Business Machines Corporation
    Inventors: J. R. Kinnard, Dennis N. Oliver