Apple was granted a patent for this invention in the last month both in the U.S. and Europe. It should be noted that Apple has a few patents with an OLED display that could read a fingerprint. One such patent report included the patent figures noted below. The actual patent filing revealed it related to OLED displays as well. Did the iPhone X team never ever consider a fingerprint technology for OLED displays? Hmm, Perhaps, but reality shows us that they were simultaneously working on an alternative methodology for some iDevices, if not the iPhone X.

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Source: patentlyapple