Metal Scaling in BSI Array
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Once the small pixel world switched to BSI, one might think that metal shifts across the pixel array is a thing of the FSI past. However, Omnivision's patent application US20110266421 "Image sensor having metal reflectors with scaled widths" brings it to BSI realm. The company proposes to scale metal reflectors 122-140 across the pixel array to reduce the optical crosstalk on the array edges and in the corners:
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