Fingerprint identification device, touch panel, input device and fingerprint identification method

  • US 10,121,047 B2
  • Filed: 12/07/2015
  • Issued: 11/06/2018
  • Est. Priority Date: 06/26/2015
  • Status: Active Grant
First Claim
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1. A fingerprint identification device, comprising:

  • a fingerprint identification module, a plurality of gate lines and a plurality of signal lines;

    wherein the gate lines and the signal lines cross so as to define a plurality of sensing regions, and each of the sensing regions comprises a thin film transistor and a sensing electrode connected to the thin film transistor;

    a gate electrode of the thin film transistor is connected to the corresponding gate line, a source electrode thereof is connected to the corresponding signal line, and a drain electrode thereof is connected to the sensing electrode;

    the signal lines comprise signal-transmitting lines and signal-receiving lines, and each sensing electrode comprises a transmitting electrode connected to the signal-transmitting line and a receiving electrode connected to the signal-receiving line;

    an electric field is generated between the transmitting electrode and the receiving electrode adjacent to the transmitting electrode, and a direction of the electric field is from the transmitting electrode to the receiving electrode adjacent to the transmitting electrode;

    the fingerprint identification module is connected to each of the signal-receiving lines, and determines, by detecting an intensity of the electric field when a finger is in the electric field, a fingerprint of the finger; and

    the sensing electrodes in an identical row comprise the transmitting electrodes and the receiving electrodes, and are connected to an identical gate line;

    wherein the fingerprint identification device further comprises;

    first amplifiers, arranged at the sensing regions corresponding to the transmitting electrodes, wherein an output terminal of each of the first amplifiers is connected to the transmitting electrode of the corresponding sensing region, and an inverting input terminal of each of the first amplifiers is connected to the drain electrode of the thin film transistor of the corresponding sensing region; and

    second amplifiers, arranged at the sensing regions corresponding to the receiving electrodes, wherein an output terminal of each of the second amplifiers is connected to the drain electrode of the thin film transistor of the corresponding sensing region, and an inverting input terminal of each of the second amplifiers is connected to the receiving electrode of the corresponding sensing region.

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