Computer Parts

How does a capacitance fingerprint scanner work?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. Capacitance fingerprint scanners sense fingerprints using electrical current. Their sensors contain many tiny cells within semiconductor chips. In order to scan the finger, the scanner must sense the difference between the voltage outputs for a fingerprint ridge or valley. Then it reads every cell in the sensor and is able to piece together a complete picture of the fingerprint.

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