It is home to the world's No. 2 and No. 3 chip-packaging and chip-testing companies, Advanced Semiconductor Engineering (ASE) and Siliconware Precision (SPIL) .

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Microchip packaging and testing is the obscure but vital business of wrapping and wiring integrated circuits.

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AICL, does a large part of Amkor's chip packaging and testing.

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The packaging and testing phase account for close to 60 percent of the cost of an LED today so unified semiconductors would further help drive down unit costs, while increasing throughput.

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