Patent ID: 6987502

Claim:
An electrophoretic display device of a cell structure, comprising: at least two electrodes; fixing surfaces each associated with one of said at least two electrodes; an electrophoretic layer disposed in the cell and comprising an insulating liquid and colored charged particles disposed in said electrophoretic layer; and voltage application means for applying a voltage between said electrodes thereby causing migration of said colored charged particles toward and collective attachment onto one of said fixing surfaces, wherein said colored charged particles have a surface adhesive layer which attaches the colored charged particles on the fixing surface so as to retain the display state under no external voltages and allows the colored charged particles to separate from the fixing surface under an external voltage exceeding a threshold value so as to rewrite the display state, said surface adhesive layer comprises a polymer having a glass transition temperature (Tg) of −35° C. to +35° C.