Low-flash electrophoretic display updates using noise masks for waveform initiation

Abstract

Methods to decrease the “flashiness” of updates in electrophoretic displays, especially color electrophoretic displays by incorporating spatial-temporal masks and / or phase shifts in the waveforms. The methods allow for a per pixel start time to begin a color update at each pixel with little cost in the way of processing power or energy consumption. In alternate embodiments selected images, e.g., logos, may be embedded into the transition appearance. The methods are generalizable to any electrophoretic display using waveforms and are particularly well-suited for newer multi-particle electrophoretic displays capable of producing four or more colors at each pixel.