OLED-based display device including a pixel circuit, and driving methods thereof

  • US 9,202,415 B2
  • Filed: 01/29/2013
  • Issued: 12/01/2015
  • Est. Priority Date: 03/21/2012
  • Status: Active Grant
First Claim
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1. An organic light emitting diode (OLED) based display device comprising a pixel circuit that includes:

  • an organic light emitting diode (OLED) having an anode and a cathode to be connected electrically to a first power terminal;

    a transistor having a first terminal, a second terminal that is connected electrically to said anode of said OLED, and a control terminal;

    a first capacitor having a first terminal and a second terminal that is connected electrically to said control terminal of said transistor;

    a second capacitor having a first terminal that is connected electrically to said first terminal of said first capacitor, and a second terminal that is connected electrically to said second terminal of said transistor;

    a first switch having a first terminal that is disposed to receive a data signal, a second terminal that is connected electrically to said first terminal of said first capacitor and said first terminal of said second capacitor, and a control terminal that is disposed to receive a scanning signal, said first switch being operable to switch between a conductive state and a non-conductive state according to the scanning signal received by said first switch;

    a second switch having a first terminal that is to be connected electrically to a second power terminal, a second terminal that is connected electrically to said first terminal of said transistor, and a control terminal that is disposed to receive an enable signal, said second switch being operable to switch between a conductive state and a non-conductive state according to the enable signal received by said second switch;

    a third switch having a first terminal that is connected electrically to said first terminal of said transistor, a second terminal that is connected electrically to said control terminal of said transistor, and a control terminal that is disposed to receive a compensation signal, said third switch being operable to switch between a conductive state and a non-conductive state according to the compensation signal received by said third switch; and

    a switching unit connected electrically to said second terminal of said transistor, disposed to receive the compensation signal, and operable to switch between a conductive state and a non-conductive state according to the compensation signal received by said switching unit;

    wherein said switching unit is configured to transmit one of the enable signal, voltage at said first terminal of said first capacitor, and a reference signal when said switching unit is operated in the conductive state.

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