An electrophoretic display medium includes one or more set of colored particles in a dielectric fluid, wherein the display medium has an electrical conductivity of about 10.sup.-11 to about 10.sup.-15 S/m, and wherein at least one of the one or more set of particles include crosslinked emulsion aggregation polymer particles. The display medium is included in an electrophoretic display device by including the medium in a multiplicity of individual reservoirs of a display layer or layers that is located between conductive substrates.