A apparatus provides grey scale capability for an electrophoretic information display. The electrophoretic information display is an XY addressable display with each XY coordinate indicative of a given column and row and defining a pixel. There are described various circuit configurations coupled to...http://www.google.se/patents/US5254981?utm_source=gb-gplus-sharePatent US5254981 - Electrophoretic display employing gray scale capability utilizing area modulation
