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Method and apparatus for driving liquid crystal display

  • US 7,522,135 B2
  • Filed: 06/28/2004
  • Issued: 04/21/2009
  • Est. Priority Date: 11/13/2003
  • Status: Active Grant
First Claim
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1. A driving apparatus for a liquid crystal display, comprising:

  • image signal modulating means for partially expanding or reducing contrast of input data to generate output data; and

    a timing controller for re-arranging the output data to apply the output data to a data driver;

    wherein the image signal modulating means includes;

    a brightness/color separator for converting the input data into brightness components and chrominance components;

    an entire area statistics part for dividing the brightness components for one frame into gray levels of the frame to generate an entire histogram;

    a partial area statistics part for dividing the brightness components one of the frame into i areas (wherein i is an integer) and for generating i partial histograms using brightness components in each divided area;

    an effective selector for comparing partial average values of the partial histograms with an entire average value of the entire histogram to select at least two effective areas of the i areas;

    a brightness distribution calculator for summing partial histograms in the effective area to generate a new histogram; and

    a data processor for generating modulated brightness components having a partially expanded and reduced contrast using the new histogram.

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