A direct fingerprint reader (DFR), also called a fingerprint scanner or fingerprint reader, is a biometrics device that uses automated methods of recognizing a person based on unique physical characteristics of a person's fingerprint. It works by capturing the reflected light of the fingerprint through the OLED pixels. So, when you touch the screen, the display lights up to illuminate the fingerprint. The sensor then captures a high-res scan of your fingerprint through the light reflected from the gaps between the pixels.
A fingerprint scanner performs a very basic function: it takes an image of your fingertip and compares it against the data of a previously scanned fingerprint. If the two match, then security is granted.
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