Patent ID: 8268717
Filing Date: 2012-09-18
Classification: H01L,H05K

Abstract:
1. A manufacturing method of a bump structure with an annular support, comprising: providing a substrate having a plurality of pads and a passivation layer having a plurality of first openings, each of the first openings exposing a portion of the pad; forming an under ball metal (UBM) material layer on the passivation layer so as to cover the passivation layer and the pads exposed by the passivation layer; forming a patterned photoresist layer on the UBM material layer, wherein the patterned photoresist layer has a plurality of second openings respectively exposing the UBM material layer over the pads, and a diameter of each of the second openings located on a bottom surface of the patterned photoresist layer is less than the diameter of each of the second openings located on a top surface of the patterned photoresist layer; forming a plurality of bumps in the second openings; removing a portion of the patterned photoresist layer so as to form an annular support at a periphery of each of the bumps, wherein a diameter of each of the annular supports is less than or equal to a diameter of a top surface of each of the bumps, such that each of the annular supports is arranged merely within a vertical projection of each of the bumps on a horizontal plane, and wherein an entire bottom surface of each of the bumps surrounded by the corresponding annular support is disposed within the first openings, and a portion of a bottom surface of each of the annular supports is disposed within the first openings; and patterning the UBM material layer with use of the annular supports and the bumps as masks, such that a plurality of UBM layers is formed, wherein an outer peripheral edge of each of the annular supports is aligned with an edge of each of the UBM layers, and an outer peripheral edge of the top surface of each of the bumps is aligned with the outer peripheral edge of each of the annular supports.