Patent ID: 7535450
Filing Date: 2009-05-19
Classification: G09G

Abstract:
1. A circuit for reducing adjacent pixel interdependence in a liquid crystal display, comprising: a decomposer for dividing an input video signal into a plurality of signals having at least a high brightness signal and a low brightness signal; a split low pass filter arrangement for independently low pass filtering rising transients and lengthening a fall time of falling transients in said low brightness signal to reduce adjacent pixel interdependence, wherein the split low pass filter arrangement comprises at least two low pass filters at least one of which is comprised of asymmetrically weighted taps thereby anticipating a bright-going signal and starting the bright-going signal going brighter earlier, at least one associated delay circuit, and a maximum selector circuit; and, a delay matching circuit for the high brightness signal; and means for combining the delayed high brightness signal with the filtered low brightness signal to provide an output with reduced sparkle artifacts.