In-display fingerprint sensors technologies are starting to find their way into smartphones and are currently using optical scanners with a more advanced ultrasonic technology expected to be released next year. Ultrasonic fingerprint scanners can allow an entire device’s screen display, or a large portion of it (even a dirty one), to work as a fingerprint reader. This allows a user to unlock a phone, open a secure app, or authenticate a payment just by placing their finger on the display.
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