A method of displaying an image in an electrophoretic display device
includes charging each of the sets of differently colored particles to
have a different charge through application of an electric field to the
display fluid or the device, and then 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. The colors are shown by way of the
particle set or sets moved to be closet to the viewing side conductive
substrate of the device. The device may include at least one display
layer, including a multiplicity of individual reservoirs containing a
display fluid, between conductive substrates, at least one of which is
transparent and thus may be a viewing side substrate, wherein the display
fluid includes at least two sets of particles in a liquid medium, the at
least two sets of particles exhibiting a different color.