Patents Represented by Attorney, Agent or Law Firm Dave V. Carlson
  • EL driver circuit
    Patent number: 6421034
    Abstract: A serial resonant circuit, formed by EL panel (CEL) and coil (L1), is connected to a push-pull driver through a positive feedback path to form an oscillator circuit. The EL panel is driven by a sinusoidal driving signal to emit light. The voltage level of the EL panel driving signal is adjusted corresponding to the change in the capacitance of the EL panel so that the luminous brightness of the EL panel can be maintained on a constant level.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 16, 2002
    Assignee: STMicroelectronics K.K.
    Inventor: Masaaki Mihara