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DA converter circuit, liquid crystal driver circuit, liquid crystal display apparatus, and method for designing DA converter circuit

  • US 20090295838A1
  • Filed: 05/28/2009
  • Published: 12/03/2009
  • Est. Priority Date: 05/29/2008
  • Status: Abandoned Application
First Claim
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1. A DA converter circuit for outputting a gray scale voltage to a liquid crystal display panel in accordance with a gray scale value externally inputted to the DA converter circuit, where the gray scale voltage and the gray scale value are of n gray scales and n is a natural number of 2 or more, the DA converter circuit comprising:

  • a generating section for generating m reference voltages, which are different from each other, where m is a natural number less than n;

    a selecting section for selecting one or two reference voltages from the m reference voltages in according to the inputted gray scale value; and

    an output section for outputting the gray scale voltage that is the one reference voltage thus selected or a mean value of the two reference voltages thus selected,the generating section generating the reference voltages in such a manner that, respectively for each end portion of a voltage range of the gray scale voltages of n gray scales, the generating section generates i reference voltages, where i is a natural number less than m and is as many as a variety of gray scale voltages that the output section is capable of outputting for each end portion respectively, and for a center portion of the voltage range, the generating section generates m−

    i reference voltages.

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