Patent ID: 7414795
Filing Date: 2008-08-19
Classification: G09G

Abstract:
1. A method of driving a display having a plurality of light-emitting elements that change with time or use, comprising the steps of: a) displaying a first image signal having spatially distributed pixels divided into a plurality of groups, each pixel group comprising more than one spatially neighboring pixel, and forming and storing one or more first image signal group attributes for each of the plurality of pixel groups; b) displaying a subsequent second image signal having spatially distributed pixels divided into the plurality of groups and forming one or more subsequent second image signal group attributes for each of the plurality of pixel groups; and c) comparing the subsequent second group attributes and the stored first group attributes to form at least one group difference value for each pixel group, comparing the group difference values to at least one predetermined metric to form at least one pixel group dynamic value, combining the group dynamic values, and if the combined group dynamic values are found to be less than a first limit, displaying a display-preserving image signal over the entire display that is different from the first and second image signals, and if the combined group dynamic values are not found to be less than a first limit, storing the subsequent second image signal group attributes.