Patent ID: 8064126

Claim:
A color electrophoresis display medium panel, comprising: a transparent substrate; a color filter layer; a transparent electrode layer; a microcapsule layer; an adhesive layer; and a rear electrode plate, wherein the transparent substrate, the color filter layer, the transparent electrode layer, the microcapsule layer, the adhesive layer and the rear electrode plate are arranged in that order, the microcapsule layer is directly formed on the transparent electrode layer, the microcapsule layer is comprised of a binder resin and a microcapsule, the microcapsule being dispersed in the binder resin, a dispersion liquid in which electrophoresis particles are dispersed in a transparent dispersion medium is enclosed in the microcapsule, and an optical reflection property of the microcapsule changes by a change of an electric field by an applied voltage, the rear electrode plate is an electrode plate in which a pixel electrode is arranged on a substrate, and the microcapsule has the following distribution wherein an average particle diameter of the microcapsule in a direction observed from a viewer is defined as X, and an average particle diameter of the microcapsule in another direction perpendicular to the direction observed from a viewer is defined as Y, X=35-45 μm, a proportion of the microcapsules when a particle diameter of the microcapsule is equal to or more than X1 (=X−20 μm) and a particle diameter of the microcapsule is equal to or less than X2 (=X+20 μm), is equal to or more than 80%, a proportion of the microcapsules when a particle diameter of the microcapsule is less than X1, is less than 20%, a proportion of the microcapsules when a particle diameter of the microcapsule is more than X2, is less than 5%, and, Y=35-45 μm, a proportion of the microcapsules when a particle diameter of the microcapsule is equal to or more than Y1 (=Y−20 μm) and a particle diameter of the microcapsule is equal to or less than Y2 (=Y+20 μm), is equal to or more than 80%, a proportion of the microcapsules when a particle diameter of the microcapsule is less than Y1, is less than 20%, a proportion of the microcapsules when a particle diameter of the microcapsule is more than Y2, is less than 5%.