Patent ID: 11943877
Assignee: UNIMICRON TECHNOLOGY CORP.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A circuit board structure, comprising:
a circuit substrate, having a first side and a second side opposite to each other, and comprising a first circuit layer disposed at the first side and a second circuit layer disposed at the second side;
a redistribution structure, disposed at the first side of the circuit substrate and electrically coupled to the circuit substrate, the redistribution structure comprising:
a first leveling dielectric layer, covering the first circuit layer of the circuit substrate;
a first thin-film dielectric layer, disposed on the first leveling dielectric layer, a material of the first thin-film dielectric layer being different from a material of the first leveling dielectric layer; and
a first redistributive layer, disposed on the first thin-film dielectric layer, wherein the first redistributive layer comprises:
a pad portion disposed on and in direct contact with an upper surface of the first thin-film dielectric layer; and
a via portion disposed between and in direct contact with the pad portion and the first circuit layer, wherein the via portion penetrates through the first thin-film dielectric layer and the first leveling dielectric layer such that the via portion is laterally and directly covered by the first thin-film dielectric layer and the first leveling dielectric layer;
a second redistributive layer, disposed on the pad portion of the first redistributive layer and electrically coupled to the first redistributive layer, a via portion of the second redistributive layer being finer than the via portion of the first redistributive layer; and

a dielectric structure, disposed at the second side of the circuit substrate and comprising a second leveling dielectric layer disposed below the second circuit layer of the circuit substrate.