The image stability of electrophoretic media, comprising a plurality of particles disposed in a fluid and capable of moving through the fluid upon application of an electric field to the medium, can be improved by including in the fluid either a polystyrene or an aggregating diblock copolymer which forms...http://www.google.fr/patents/US7679814?utm_source=gb-gplus-shareBrevet US7679814 - Materials for use in electrophoretic displays
