Driving circuit of AMOLED and method for driving the AMOLED

  • US 9,343,012 B2
  • Filed: 01/23/2014
  • Issued: 05/17/2016
  • Est. Priority Date: 12/31/2013
  • Status: Active Grant
First Claim
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1. A driving circuit of an active matrix/organic light emitting diode (AMOLED) display, comprising:

  • a first semiconductor controllable switch;

    a second semiconductor controllable switch;

    an energy-storage capacitor;

    an organic light emitting diode;

    a sequential control unit that divides a driving time of one frame of the organic light emitting diode into driving times of N subframes; and

    an over-voltage driving unit that increases current of the organic light emitting diode when the organic light emitting diode displays;

    the over-voltage driving unit comprises a data driving unit that provides the data driving signal and a gamma correction unit coupled to the data driving unit;

    wherein an output end of the second semiconductor controllable switch is coupled to an anode of the organic light emitting diode, a source electrode of the first semiconductor controllable switch receives a data driving signal of the AMOLED, a gate electrode of the first semiconductor controllable switch receives a scan driving signal of the organic light emitting diode, a drain electrode of the first semiconductor controllable switch is connected with a gate electrode of the second semiconductor controllable switch, and the energy-storage capacitor is connected in series between a source electrode and the gate electrode of the second semiconductor controllable switch;

    wherein the data driving signal is divided into an active signal that chives display of the organic light emitting diode, and a blanking signal that turns off display of the organic light emitting diode in tire driving time of each of the subframes;

    wherein N is a natural number and is greater than or equal to 2;

    in a time of outputting any one or more blanking signals, the over-voltage driving unit increases current of the organic light emitting diode through increasing a voltage of an output end of the second semiconductor controllable switch, reducing a voltage of the cathode of the organic light emitting diode, and increasing an output voltage of the gamma correction unit.

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