Method and apparatus for sparkle reduction using a split lowpass filter arrangement
AssigneeThomson Licensing
InventorDonald Henry Willis
Life of this patent
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Abstract
A circuit (10) for reducing errors due to adjacent pixel interdependence in a liquid crystal display includes a decomposer (12) for dividing an input signal into a plurality of signals having at least a high brightness signal and a low brightness signal, a delay match circuit (14) for the high brightness signal a split low pass filter arrangement (25) for the low brightness signal, and a combiner (24) for combining the delay matched high brightness signal and the filtered low brightness signal to provide an output, wherein the output signal has reduced sparkle.
Claims12
A circuit for reducing adjacent pixel interdependence in a liquid crystal display, comprising:
- a decomposer for dividing an input 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 falling transients in said low brightness signal to reduce adjacent pixel interdependence;
- 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.
A method for reducing adjacent pixel interdependence in a liquid crystal display, comprises the steps of:
- dividing an input signal into at least a high brightness signal and a low brightness signal;
- independently low pass filtering rising transients and falling transients in said low brightness signal to reduce adjacent pixel interdependence;
- delay matching the high brightness signal with said filtered low brightness signal;
- and,
- combining the delay matched high brightness signal and the filtered low brightness signal to provide an output signal with reduced sparkle artifacts.
Dependencies are inferred from the claim text.