Patent ID: 11923353
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method comprising:
forming a Light To Heat Conversion (LTHC) coating material over a carrier;
forming a first through-via and a second through-via over the LTHC coating material;
attaching a first die to the carrier, the first die being disposed adjacent to the first through-via and the second through-via;
surrounding each of the first die, the first through-via, and the second through-via with an encapsulating material;
exposing the LTHC coating material to a laser beam to remove the carrier, wherein during exposing the LTHC coating material to the laser beam, first portions of the LTHC coating material are recessed by a first amount, and second portions of the LTHC coating material are recessed by a second amount, the second amount being different from the first amount, wherein after exposing the LTHC coating material to the laser beam, a difference in height between a thickness of the first portions and a thickness of the second portions is in a range from 0.1 μm to 0.5 μm; and
performing a laser drilling process to form first openings through the LTHC coating material, wherein the first openings expose the first through-via and the second through-via.