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Copper pillar bumping is a promising solution to cope with the challenges which flip chip packages face when bump pitch size keep shrinking. A large FCBGA (flip chip ball grid array) package for 45 nm Cu/Low-K device with Cu pillar bumps is chosen to investigate the package reliability. Finite element models have been built with multi-level sub-modeling technique to consider the detailed Cu/Low-K...
The objective of the present study is to develop a robust high-throughput assembly process of light emitting diode arrays for wide area general lighting. Topics to be covered in this paper include the conceptual design, the flexible printed circuit substrate, flip chip assembly, yellow phosphor coating, and encapsulation. All these are integrated into one reel-to-reel assembly process. A prototype...
Flip chip packaging of ultra fine pitch integrated circuits (ICs) on organic substrates aggravates the stress-strain concerns, requiring a fundamentally different system approach to interconnections, underfill, interfaces, and the substrate. This work demonstrates a novel interconnection solution with excellent reliability for ultra-fine pitch (~30 mum) silicon (Si) on organic first level interconnections...
The objective of the present study is to develop a robust high-throughput assembly process of light emitting diode arrays for wide area general lighting. Topics to be covered in this paper include the conceptual design, the flexible printed circuit substrate, flip chip assembly, yellow phosphor coating, and encapsulation. All these are integrated into one reel-to-reel assembly process. A prototype...
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