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TSMC patent application US20170117315 "Back-side illuminated (BSI) image sensor with global shutter scheme" by Chun-yuan Chen, Ching-chun Wang, Dun-nian Yaung, Shyh-fann Ting, Wei Chuang Wu, Yen-ting Chiang, and Kuan-tsun Chen proposes a light reflector to protect storage node from light, a tough challenge in BSI GS pixels. The reflecting element is shown as 108 on the figure 3 below:
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