Patent ID: 7576711
Filing Date: 2009-08-18
Classification: G09G

Abstract:
1. A contrast compensating apparatus for a PDP module, comprising: an APL (Average Picture Level) calculating unit for calculating an APL of a video signal; a sustain pulse generating unit for generating and providing sustain pulses the number of which corresponds to an output of the APL calculating unit to the PDP module; a histogram analyzing unit for calculating a maximum value M of brightness repeating numbers of the video signal, a minimum brightness value W a comparing unit for comparing the output of the APL calculating unit with at least one brightness section threshold value and outputting a result of comparison; a contrast compensating unit for comparing an output of the comparing unit with a first setting value, comparing the maximum value of the brightness repeating numbers from the histogram analyzing unit with a second setting value, and calculating a contrast compensation value using the minimum brightness value W a mixer for feeding an output of the contrast compensating unit back to an input terminal of the video signal, wherein the contrast compensating unit calculates the contrast compensation value in a manner that the contrast compensating unit calculates a brightness difference between the minimum brightness value W