Patent ID: 6909532

Claim:
A matrix driven electrophoretic display comprising: a top electrode layer; a multi-layer back plane; and an electrophoretic cell layer positioned between the top electrode layer and the multi-layer back plane; wherein the multi-layer back plane comprises: a first conductive layer formed on a first substrate having a top surface and a bottom surface, the first conductive layer comprising an electrode formed on the top surface of the first substrate, the electrode comprising a metal thin film structure having a thickness of no greater than 5 microns; a second conductive layer comprising a circuit routing trace associated with the electrode; a third conductive layer comprising a circuit element associated with the electrode; and a first via structure communicating from the first conductive layer to the second conductive layer through the first substrate; and wherein the first via structure forms at least part of a conductive path by which said electrode formed on the top surface of the first substrate is connected electrically to said circuit routine trace associated with the electrode.