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

Claim 0:
1. A method comprising:
forming a Light To Heat Conversion (LTHC) coating material over a transparent carrier, wherein the LTHC coating material comprises carbon black particles;
forming a polymer buffer layer over the LTHC coating material;
attaching a first die to the polymer buffer layer;
forming a molding compound over the polymer buffer layer, wherein the molding compound surrounds the first die;
forming a redistribution structure over the molding compound and the first die;
removing the transparent carrier, wherein removing the transparent carrier comprises projecting a light beam through the transparent carrier to enlarge first carbon black particles in a first portion of the LTHC coating material without enlarging second carbon black particles in a second portion of the LTHC coating material, wherein the first portion of the LTHC coating material is within a working range of the light beam, and wherein the second portion of the LTHC coating material is outside the working range of the light beam; and
planarizing the second portion of the LTHC coating material after removing the transparent carrier.