Display driving circuit

A display driving circuit comprising:

• a first electrode from which a data signal is output;
• a second electrode from which a scan signal is output;
• a light emitting diode having an anode and cathode coupled to a first power supply providing a first voltage(Vss);
• a first transistor having a drain, a source coupled to the first end of the capacitor and a gate coupled to the second electrode to receive the scan signal;
• a second transistor having a drain coupled to a second power supply providing a second voltage(VDD), a source coupled to the anode of the light emitting diode, and a gate coupled to the source of the first transistor;
• a capacitor having a first and second end with a voltage difference therebetween, wherein the first end is coupled to the gate of the second transistor and the second end is coupled to the source of the second transistor;
• a third switch having a drain coupled to a third power supply providing a third voltage(Vref) and a source coupled to the source of the second transistor, and a gate coupled to the gate of the first transistor.