Patent ID: 7259744

Claim:
A dielectrophoretic display comprising: a substrate having walls defining at least one cavity, the cavity having a viewing surface and a side wall inclined to the viewing surface; a suspending fluid contained within the cavity; a plurality of a first type of particle suspended within the suspending fluid, the first type of particle having a first optical characteristic and a first electrophoretic mobility; a plurality of a second type of particle suspended within the suspending fluid, the second type of particle having a second optical characteristic different from the first optical characteristic and a second electrophoretic mobility different from the first electrophoretic mobility; a backing member disposed on the opposed side of the cavity from the viewing surface, at least part of the backing member having a third optical characteristic different from the first and second optical characteristics; and means for applying to the substrate an electric field effective to cause dielectrophoretic movement of the first and second types of particles to the side wall of the cavity.