Patent ID: 8373243
Filing Date: 2013-02-12
Classification: H01L

Abstract:
1. A backside illuminated imaging sensor, comprising: an epitaxial layer having an imaging array formed in a front side of the epitaxial layer, wherein the imaging array is adapted to receive light from a back side of the epitaxial layer; a metal stack coupled to the front side of the epitaxial layer, wherein the metal stack includes a seal ring formed in an edge region of the imaging sensor; an opening extending from the back side of the epitaxial layer to a metal pad of the seal ring to expose the metal pad; and a seal ring support disposed on the metal pad and within the opening to structurally support the seal ring, wherein the seal ring support has a first width in a corner region of the backside illuminated imaging sensor and wherein the seal ring support has a second width different from the first width in a side region of the backside illuminated imaging sensor.