An electrophoretic display comprises a pair of facing substrates, at least one of which is transparent, a plurality of particles and a gas between the substrates, and means for applying an electric field to cause the particles to move and thus change the electro-optic state of the display. The electric...http://www.google.com/patents/US20080024429?utm_source=gb-gplus-sharePatent US20080024429 - ELECTROPHORETIC DISPLAYS USING GASEOUS FLUIDS
