Patent ID: 7616177

Claim:
A pixel driving circuit, comprising: a storage capacitor having a first and second node; a transferring circuit coupled to the first node of the storage capacitor, the transferring circuit transferring a data signal or a variable reference signal to the first node of the storage capacitor, wherein the variable reference signal is a pulsed reference signal; a driving element having a first terminal coupled to a first fixed potential, a second terminal coupled to the second node of the storage capacitor, and a third terminal for outputting a driving current; a switching circuit, coupled to the third terminal of the driving element and the second node of the storage capacitor, capable of making the driving element diode-connected in one time period and allowing the driving current to be output to a display element in another time period; and a reference signal generator coupled to the transferring circuit, wherein the reference signal generator comprises: a first AND gate, with two inputs receiving signals from vertical shift registers, the first AND gate generating an output signal; a first NAND gate, with a first input receiving the output signal from the first AND gate and a second input receiving a first enabling signal, the first NAND gate generating a first scan signal for a second scan line; a second NAND gate, with three inputs receiving the output signal from the first AND gate, the first enabling signal, and a second enabling signal respectively, the second NAND gate generating a second scan signal for a first scan line; and a second AND gate, with a first input receiving the output signal from the first AND gate and a second input receiving the second enabling signal, the second AND gate generating a reference signal.