Patent ID: 8437142

Claim:
A bump structure disposed on a substrate, the substrate having a plurality of bond pads and a protecting layer, wherein the protecting layer having a plurality of openings that reveal the bond pads, the bump structure electrically connected with each of the bond pads comprising: a first polymer block disposed on the bond pad and the protecting layer and comprising a first top surface and a first connection slot recessed from the first top surface, wherein the first polymer block is an individual block, and the first top surface defines a first coverage area and a first exposure area; a second polymer block disposed on the bond pad and the protecting layer and comprising a second top surface and a second connection slot recessed from the second top surface, wherein the second polymer block is an individual block, and the second top surface defines a second coverage area and a second exposure area; a first groove located between the first polymer block and the second polymer block, the bond pad is revealed by the first groove communicated with the first connection slot of the first polymer block and the second connection slot of the second polymer block; an under bump metallurgy layer covering the bond pad, the first coverage area, the first connection slot, the second coverage area and the second connection slot, wherein the first exposure area of the first polymer block and the second exposure area of the second polymer block are revealed by the under bump metallurgy layer, wherein a second groove, a third connection slot and a fourth connection slot are formed on the under bump metallurgy layer, the second groove in communication with the third connection slot and the fourth connection slot is located on top of the first groove, the third connection slot is located on top of the first connection slot, and the fourth connection slot is located on top of the second connection slot; and a connection metal layer covering the under bump metallurgy layer, wherein a third groove, a fifth connection slot and a sixth connection slot are formed on the connection metal layer, the third groove is in communication with the fifth connection slot and the sixth connection slot and located on top of the second groove, the fifth connection slot is located on top of the third connection slot, and the sixth connection slot is located on top of the fourth connection slot.