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Self-capacitive fingerprint sensor with active amplified pixels

  • US 9,990,533 B2
  • Filed: 10/18/2016
  • Issued: 06/05/2018
  • Est. Priority Date: 10/06/2014
  • Status: Active Grant
First Claim
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1. A fingerprint sensor device, comprising:

  • a substrate;

    a fingerprint sensor disposed over the substrate, wherein the fingerprint sensor includes an array of sensor pixels configured to generate fingerprint data by sensing ridges and valleys of a surface of a finger contacting the fingerprint sensor device; and

    a pressure sensor disposed over the substrate at a plane of the fingerprint sensor, wherein the pressure sensor is configured to detect a pressure from the finger to communicate an unlock signal to initiate fingerprint detection;

    wherein the fingerprint sensor is configured to send the unlock signal, responsive to the detected touch from the finger, to a main processor to indicate a request to initiate fingerprint detection;

    receive a response signal, responsive to the send unlock signal, from the main processor acknowledging that a mobile device is waking up; and

    initiate a fingerprint detection responsive to the received response signal.

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