Patent ID: 7259468

Claim:
A structure of package, comprising: a device having a fixed area and a buffer area, wherein metal pads are formed over said fixed area and a zigzag cushion is formed over said buffer area; a patterned first isolation layer covering a partial region of a passivation layer of said device, wherein said zigzag cushion is formed on said patterned first isolation layer to have a zigzag pattern due to the topography of said patterned first isolation layer, wherein said zigzag pattern is partially attached on said passivation layer and partially attached on said patterned first isolation layer; a second isolation layer covering said zigzag cushion, said second isolation layer having a plurality of openings, each of said openings having a contact conductive ball electrically coupling with an external part; and a patterned third isolation layer formed between said patterned first isolation layer and said zigzag cushion; wherein the material for said third isolation layer is a material selected from the group consisting of BCB, SINR (Siloxane polymer), epoxy, polyimide and resin, wherein said zigzag cushion at said fixed area of said structure of package will not directly stretch said metal pads when said contact conductive ball is placed on a printed circuit board, said zigzag cushion acting as a buffer of said package to absorb the stress.