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Pixel circuit, its driving method, light-emitting diode display panel, and display device

  • US 9,984,272 B2
  • Filed: 01/06/2015
  • Issued: 05/29/2018
  • Est. Priority Date: 09/26/2014
  • Status: Active Grant
First Claim
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1. A pixel circuit, comprising a light-emitting diode (LED), a cathode of which is connected to a first signal source, wherein the pixel circuit further comprises:

  • a display driving circuit directly connected to a first scanning line, a second scanning line, a control line, a data line, a second signal source, a third signal source, and an anode of the LED, and configured to, under the control of a first scanning signal from the first scanning line, a second scanning signal from the second scanning line, and a control signal from the control line, compensate for a threshold voltage of a driving transistor using a data signal from the data line and a second signal from the second signal source, so that a light-emitting driving signal for the LED is irrelevant to the threshold voltage of the driving transistor; and

    a fingerprint identification circuit directly connected to the first scanning line, the second scanning line, a fourth signal source, and a signal read line, and configured to, under the control of the first scanning signal from the first scanning line and the second scanning signal from the second scanning line, identify a fingerprint and detect a touch;

    wherein the fingerprint identification circuit comprises a resetting transistor, an amplifying transistor, a switching transistor, a third storage capacitor, and a detection electrode;

    a first electrode of the resetting transistor is directly connected to the fourth signal source, a gate electrode thereof is directly connected to the first scanning line, and a second electrode thereof is directly connected to a second end of the third storage capacitor;

    a first electrode of the amplifying transistor is directly connected to the fourth signal source, a gate electrode thereof is directly connected to the second end of the third storage capacitor, and a second electrode thereof is directly connected to a first electrode of the switching transistor;

    a gate electrode of the switching electrode is directly connected to the second scanning line, and a second electrode thereof is directly connected to the signal read line;

    a first end of the third storage capacitor is directly connected to the second scanning line; and

    the detection electrode is directly connected to the second end of the third storage capacitor.

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