Patent ID: 7227525

Claim:
An electrophoretic display device comprising a substrate and unit cells provided thereon, each of which comprising: one display electrode, two collection electrodes, a first type of charged particle, and a second type of charged particle, wherein the first type of charged particle is different from the second type of charged particle in charge polarity and coloration; and a driving means capable of forming a state in which the first type of charged particle and the second type of charged particle have been collected at each of the collection electrodes, a state in which the first type of charged particle has been disposed on the display electrode and the second type of charged particle has been collected at one of the collection electrodes, a state in which the first type of charged particle has been collected at one of the collection electrodes and the second type of charged particle has been disposed on the display electrode, and a state intermediate between these states, wherein said two collection electrodes are disposed at a position where they lie substantially one upon another as viewed from the observer side.