Display panel, pixel driving circuit, and drying method thereof

1. A pixel driving method, comprising:

providing a pixel driving circuit comprising a driving transistor, a first capacitor and a second capacitor, wherein the driving transistor comprises a gate terminal, a source terminal and a drain terminal, the first capacitor being connected between the gate terminal and a ground terminal, the second capacitor being connected between the gate terminal and the source terminal, and wherein the pixel driving circuit further comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a light-emitting diode, a first control-signal terminal, a second control-signal terminal, a third control-signal terminal, an initial-voltage-signal terminal, a data-voltage-signal terminal and a driving-voltage-signal terminal, wherein the first switch is connected between the gate terminal and the drain terminal; the second switch connects the gate terminal with the initial-voltage-signal terminal; the third switch connects the source terminal with the driving-voltage-signal terminal and the fourth switch connects the source terminal with the data-voltage-signal terminal; the fifth switch is connected between the drain terminal and the light emitting terminal diode; the first control-signal terminal is connected with a control terminal of the first switch, a control terminal of the third switch, and a control terminal of the fourth switch; the second control-signal terminal is connected with a control terminal of the second switch; the third control-signal terminal is connected with a control terminal of the fifth switch, wherein the third switch and the fourth switch that connect the source terminal with the driving-voltage-signal terminal and the data-voltage-signal terminal, respectively, are controlled by a common control signal to operate opposite to each other so as to alternately switch on to connect the source terminal to the driving-voltage-signal terminal and the data-voltage-signal terminal in an alternate manner;

a reset phase, applying an initial voltage to the gate terminal and applying a driving voltage to the source terminal, so as to reset a potential of the gate terminal and a potential of the source terminal;

a storage phase, loading a data voltage to the source terminal and conducting the gate terminal and the drain terminal, so that the data voltage charges the gate terminal until a potential difference between the source terminal and the gate terminal is a Vth, the Vth is a threshold voltage of the driving transistor, and storing the potential of the gate terminal in the first capacitor and the Vth in the second capacitor;

a lighting phase, loading the driving voltage to the source terminal, and changing the potential of the gate terminal, so as to stabilize a driving current of the driving transistor;

wherein in the reset phase, the first control-signal terminal and the third control-signal terminal are loaded with a high-level signal, and the second control-signal terminal is loaded with a low-level signal, so that the second switch and the third switch are turned on, the first switch, the fourth switch and the fifth switch are turned off, the gate terminal is loaded with the initial voltage via the second switch, the source terminal are loaded with the driving voltage via the third switch;

wherein in the storing stage, the first control-signal terminal is loaded with the low-level signal, and the second control-signal terminal and the third control-signal terminal are loaded with the high-level signal, so that the first switch and the fourth switch are turned on, the second switch, the third switch, and the fifth switch are turned off, the source terminal is loaded with the data voltage via the fourth switch, the data voltage is Vdata, the data voltage charges the gate terminal via the fourth switch, the driving transistor, and the first switch, and makes the potential of the gate terminal be Vdata−Vth; and

wherein the pixel driving circuit further comprises a negative voltage-signal terminal, the light-emitting diode comprises a positive terminal and a negative terminal, the fifth switch is connected between the drain terminal and the positive terminal, and the negative terminal is connected with the negative voltage-signal terminal;

in the lighting stage, the first control-signal terminal and the second control-signal terminal are loaded with the high-level signal, and the third control-signal terminal is loaded with the low-level signal, so that the third switch and the fifth switch are turned on, the second switch, the first switch, and the fourth switch are turned off; the source terminal is loaded with the driving voltage via the third switch, so as to make the driving voltage be Vdd, the gate terminal potential is Vdata−Vth+δV, and the potential difference between the source terminal and the gate terminal is Vdd−Vdata+Vth−δV, and δV=(Vdd−Vdata)*C 2 /(C 1 +C 2 ), wherein C 1 is a capacitance value of the first capacitor, C 2 is a capacitance value of the second capacitor, so that the driving current is independent of the threshold voltage; the third switch, the driving transistor and the fifth switch are turned on, so that the driving-voltage-signal terminal and the negative voltage-signal terminal are conducted, the driving current drives the light-emitting diode to light.