Patent ID: 8692743

Claim:
A pixel driving circuit, comprising: a first switch, comprising a first end for receiving a data signal, a second end and a control end for receiving a scan signal; a first capacitor, comprising a first end electrically connected to the second end of the first switch, and a second end; a transistor, comprising a first end, a control end electrically connected to the first end of the first capacitor, and a second end electrically connected to the second end of the first capacitor; a second switch, comprising a first end electrically connected to a first voltage source, a second end electrically connected to the first end of the transistor, and a control end for receiving a first control signal; a second capacitor, comprising a first end electrically connected to the second end of the transistor, and a second end electrically connected to a second voltage source; an organic light emitting diode, comprising a first end electrically connected to the second end of the transistor, and a second end electrically connected to the second voltage source; and a third switch, comprising a first end electrically connected to a third voltage source, a second end electrically connected to the first end of the transistor, and a control end for receiving a second control signal; wherein the first voltage source is configured to supply a voltage of a first fixed voltage level, the third voltage source is configured to supply a voltage of a second fixed voltage level, and the first fixed voltage level is higher than the second fixed voltage level; wherein when the first switch and the third switch are turned on and the second switch is turned off, the data signal transmits a reference voltage to the control end of the transistor via the first switch, and the second end of the transistor receives the voltage of the second fixed voltage level; and wherein when the first switch and the second switch are turned on and the third switch is turned off, the second end of the transistor receives the voltage of the first fixed voltage level, and a voltage of the second end of the transistor is generated according to the reference voltage and a threshold voltage of the transistor.