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Driving and scanning circuit, display screen and mobile terminal

  • US 10,217,804 B2
  • Filed: 08/17/2016
  • Issued: 02/26/2019
  • Est. Priority Date: 12/15/2015
  • Status: Active Grant
First Claim
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1. A driving and scanning circuit, comprising:

  • a plurality of driving and scanning units which are distributed in an array, wherein each driving and scanning unit comprises an AMOLED driving unit for driving an OLED to emit light and a fingerprint scanning unit for forming pixel capacitances, whereinthe AMOLED driving unit comprises a first thin film transistor, a second thin film transistor, a third thin film transistor and an OLED, the first thin film transistor is connected with a first driving voltage and a first switching voltage, the second thin film transistor and the third thin film transistor are respectively connected with an anode terminal and a cathode terminal, and the OLED is positioned between the cathode terminal and the second thin film transistor;

    the cathode terminal comprises a fourth thin film transistor, and the fourth thin film transistor is connected with a second driving voltage and a second switching voltage;

    one and only one of the AMOLED driving unit and the fingerprint scanning unit is in a conducting state;

    in the fingerprint scanning unit;

    a gate of the fourth thin film transistor is connected with the second switching voltage, and a source and a drain are respectively connected with the OLED and the second driving voltage;

    the first switching voltage and the first driving voltage are respectively connected with a first scanning line and a first signal line, and the second switching voltage and the second driving voltage are respectively connected with a second scanning line and a second signal line.

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