Patent ID: 8030767

Claim:
A bump structure with an annular support suitable for being disposed on a substrate comprising at least a pad and a passivation layer, wherein the passivation layer comprises at least an opening exposing a portion of the pad, the bump structure comprising: an under ball metal (UBM) layer which is disposed on the passivation layer and covers the portion of the pad exposed by the passivation layer; a bump disposed on the UBM layer over the pad, a diameter of a bottom surface of the bump being less than the diameter of a top surface of the bump; and an annular support surrounding and contacting the bump, a material of the annular support being photoresist, wherein a diameter of the annular support is less than or equal to the diameter of the upper surface of the bump, and an outer peripheral edge of the annular support is aligned with an edge of the UBM layer, such that the annular support is arranged merely within a vertical projection of the bump on a horizontal plane, wherein the entire bottom surface of the bump surrounded by the annular support is disposed within the opening, wherein a portion of a bottom surface of the annular support is disposed within the opening, and wherein an outer peripheral edge of the top surface of the bump is aligned with the outer peripheral edge of the annular support.