The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2003
Filed:
May. 01, 2001
Applicant:
Inventors:
Assignee:
Industrial Technologies Research Institute, Hsin Chu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/144 ;
U.S. Cl.
CPC ...
H01L 2/144 ;
Abstract
A method for forming a wafer level package incorporating a multiplicity of elastomeric blocks as stress buffering layer and package formed are described. The method incorporates the step of forming metal lines in-between the plurality of IC dies on a wafer during the same process used for forming the metal vias. The metal lines are subsequently removed by either a mechanical method such as dicing with a diamond saw or by a chemical method such as wet etching. The method allows the fabrications of a wafer level package that has a multiplicity of elastomeric blocks formed on top as stress buffering layer without the CTE mismatch problem with other layers on the wafer.