Patent ID: 7522135

Claim:
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.