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Power supply circuit for driving liquid crystal display

  • US 7,138,971 B2
  • Filed: 03/05/2002
  • Issued: 11/21/2006
  • Est. Priority Date: 03/09/2001
  • Status: Expired due to Fees
First Claim
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1. A power supply circuit that generates a plurality of drive voltages having intermediate voltage levels with respect to a peak voltage level, the intermediate voltage levels being grouped into a first group of voltage levels comprising intermediate voltage levels that are low level with respect to the peak voltage level and a second group of voltage levels comprising intermediate voltage levels that are high level with respect to the peak voltage level, said power supply circuit comprising:

  • an amplifier having a voltage follower configuration;

    at least one capacitor connected to the amplifier, said at least one capacitor and said amplifier generating a first voltage level included in the first group of voltage levels; and

    a switch circuit controlled at a predetermined timing to switch said at least one capacitor to generate a second voltage level included in the second group of voltage levels with a discharge voltage of said at least one capacitor and the peak voltage level.

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