Advanced Module Packaging Method

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Advanced Module Packaging Method
An intermediate solution between conventional printed circuit board technology and wafer level packaging, WLP, is to fabricate interconnection circuits and flip chip assembly structures on large glass substrates using LCD manufacturing equipment. Trace widths of 5 microns and a trace pitch of 10 microns are achievable on flexible substrates as large as 1800 x 1500 mm. Back planes for displays and keyboards can also utilize thin film transistors, TFTs, as developed for LCDs and enhanced for flexible assemblies (200ºC processing). A flexible circuit is built on a glass carrier with an intermediate release layer. The carrier is discarded after all processing is complete, including interconnection circuits, IC chip assembly, test and rework. The assembly method uses gold stud bumps on IC chips, and corresponding wells filled with solder on the motherboard. 100-micron pad pitch is achievable for IC chips, module cables, and test connections. Avoidance of epoxy under layers contributes to ...
Peter C. Salmon
Added 04 Jul 2010
Updated 04 Jul 2010
Type Conference
Year 2003
Authors Peter C. Salmon
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