Patent ID: 8161638

Claim:
A method for forming a circuit structure, comprising: providing a composite dielectric layer, an insulating layer and a circuit board, wherein the insulating layer is located between the circuit board and the composite dielectric layer, the composite dielectric layer comprises a non-platable dielectric layer and a platable dielectric layer, the platable dielectric layer is located between the non-platable dielectric layer and the insulating layer, a material of the non-platable dielectric layer includes a chemical non-platable material, and a material of the platable dielectric layer includes a chemical platable material; compressing the composite dielectric layer, the insulating layer and the circuit board; forming a through hole penetrating through the composite dielectric layer and the insulating layer, wherein the through hole exposes a portion of a circuit layer of the circuit board; forming a conductive via in the through hole, wherein the conductive via is connected the circuit layer; forming a trench pattern on the composite dielectric layer, wherein the trench pattern penetrates through the non-platable dielectric layer; and performing a first chemical plating process so as to form a conductive pattern in the trench pattern, wherein the conductive pattern is connected to the conductive via.