Report: Apple uses two microscopic QR codes on iPhone displays to track defects, which has helped cut its suppliers' faulty screen report rates from 30% to 10% (William Gallagher/AppleInsider)

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William Gallagher / AppleInsider:

Report: Apple makes use of two microscopic QR codes on iPhone shows to trace defects, which has helped lower its suppliers’ defective display report charges from 30% to 10%  —  Apple spent thousands and thousands so as to add a barcode to iPhone shows to be able to save being charged a whole lot of thousands and thousands by producers claiming defective screens that will not have been.