Patent ID: 7605018

Claim:
A method for forming a die-attach layer during semiconductor packaging processes, primarily comprising the steps of: providing a chip carrier, including a substrate core and a stiffener, the substrate core having a top surface including a plurality of die-attaching units and a peripheral area, wherein the stiffener is attached to the peripheral area of the top surface without covering the die-attaching units; providing a non-planar printing stencil, having a non-planar contact surface, wherein the thickness at the peripheries of the non-planar contact surface is reduced to compensate the thickness of the stiffener, wherein the non-planar printing stencil further has a plurality of printing openings; pressing the non-planar printing stencil against the chip carrier in a manner that the die-attaching units of the substrate core are exposed from the printing openings, and the non-planar printing stencil is compliantly in contact with the substrate core and the stiffener; and printing die-attach material through the printing openings of the non-planar printing stencil to apply to the die-attaching units on the substrate core.