Method and apparatus for sparkle reduction by reactive and anticipatory slew rate limiting
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 at least one low brightness signal, a delay match circuit (14) for the high brightness signal to provide a delay high brightness signal, one or more transient conditioner circuits (16 and/or 18) for processing the at least one low brightness signal to provide at least one transient conditioned low brightness signal, and a combiner (20) for combining the delay matched high brightness signal with the at least one transient conditioned low brightness signal to provide an output signal having reduced sparkle artifacts.
Claims17
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 at least one low brightness signal;
- at least one transient conditioner circuit for reducing adjacent pixel interdependence by limiting signal transients between brightness levels in said at least one low brightness signal;
- a delay match circuit for said high brightness signal;
- and,
- means for combining the delayed high brightness signal with said at least one signal transient processed low brightness signal to provide an output signal, wherein said output signal has reduced sparkle artifacts.
A method for reducing adjacent pixel interdependence in a liquid crystal display, comprising the steps of:
- dividing an input signal into at least a high brightness signal and at least one low brightness signal;
- slew rate limiting and finite response filtering the at least one low brightness signal to reduce adjacent pixel interdependence by limiting signal transients between brightness levels;
- delay matching the high brightness signal;
- and,
- combining said at least one slew rate limited and finite response filtered low brightness signal and said delayed high brightness signal to form an output signal having reduced sparkle artifacts.
Dependencies are inferred from the claim text.