A method of displaying an image in an electrophoretic display device
having at least one display layer including a multiplicity of individual
reservoirs containing a display fluid between conductive substrates,
wherein the display fluid comprises at least two sets of particles in a
liquid medium, the at two sets of particles each exhibiting a different
color, wherein a first set of particles and a second set of particles
have a same charge polarity and the first set of particles has a higher
average charge than the second set of particles, includes applying an
electric field to selected ones of the multiplicity of reservoirs to
effect movement of one or more of the differently colored sets of
particles in the display fluid therein to display a desired color derived
from among the sets of differently colored particles, wherein the
applying to display a color of the second set of particles involves
pulsing an electric field through the conductive substrates for a time
sufficient to attract the first set of particles away from a front
viewing conductive substrate and past the second set of particles.