Patent ID: 8692378

Claim:
A device comprising: a semiconductor die; a first under bump metal structure having a first enclosure on a first region of the semiconductor die, wherein the first under bump metal structure is configured to connect a first redistribution layer with a first bump, and wherein an edge of the first redistribution layer extends beyond an edge of the first under bump metal structure, and wherein the first enclosure is a gap between the edge of the first redistribution layer and the edge of the first under bump metal structure; and a second under bump metal structure having a second enclosure on a second region of the semiconductor die, wherein the second under bump metal structure is configured to connect a second redistribution layer with a second bump, and wherein an edge of the second redistribution layer extends beyond an edge of the second under bump metal structure, and wherein the second enclosure is a gap between the edge of the second redistribution layer and the edge of the second under bump metal structure, and wherein the first region is away from an edge of the semiconductor die and the second region is adjacent to the edge of the semiconductor die, and wherein the second enclosure is greater than the first enclosure.