An electrophoretic display medium includes one or more set of colored
particles in a dielectric fluid, wherein at least one of the one or more
set of particles comprise poly(meth)acrylate/hydrophilic monomer)
emulsion aggregation polymer particles such as poly(methyl
methacrylate/butyl acrylate/.beta.-carboxyethylacrylate) 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.