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HIGH RESOLUTION FINGERPRINT IMAGING DEVICE

  • US 20140266262A1
  • Filed: 03/14/2013
  • Published: 09/18/2014
  • Est. Priority Date: 03/14/2013
  • Status: Abandoned Application
First Claim
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1. A fingerprint sensor pixel comprising:

  • a capacitive sensor, wherein a capacitance of the capacitive sensor changes in response to contact with the valley or the ridge a fingerprint; and

    a readout circuit comprising;

    a first thin film transistor (TFT) having a gate terminal, a drain terminal, and a source terminal, wherein the gate terminal of the first TFT is coupled to the capacitive sensor; and

    a coupling capacitor having a first terminal and a second terminal, wherein the first terminal of the coupling capacitor is coupled to the gate terminal of the first TFT,wherein the readout circuit is configured to generate, in response to a voltage applied to the second terminal of the coupling capacitor, a current flow between the drain terminal of the first TFT and the source terminal of the first TFT representative of the capacitance of the capacitive sensor.

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