Pixel driving circuit, method thereof and display panel

A method for pixel driving, applied to a pixel driving circuit comprising:

• a first charging unit, wherein an input terminal of the first charging unit is configured for inputting a pre-charge voltage, and an output terminal of the first charging unit is connected to an energy storage capacitor, so as to charge the energy storage capacitor when the first charging unit is turned on;
• a discharging unit, wherein a first terminal of the discharging unit is connected to the energy storage capacitor, and a second terminal of the discharging unit is connected to a ground, so as to discharge a voltage of the energy storage capacitor to a preset voltage when the discharging unit is turned on;
• a second charging unit, wherein an input terminal of the second charging unit is configured for inputting a data voltage, and an output terminal of the second charging unit is connected to the energy storage capacitor, so as to charge the energy storage capacitor when the second charging unit is turned on;
• and
• a driving transistor, wherein a first electrode of the driving transistor is configured for inputting a power supply voltage, a second electrode of the driving transistor is configured for connecting with the sub-pixels, and a gate electrode of the driving transistor is connected to the energy storage capacitor, so as to emit light through the sub-pixels when the energy storage capacitor discharges the gate electrode of the driving transistor;
• and
• the method comprises:
• controlling, during a first period of time, the first charging unit to be turned on to charge the energy storage capacitor;
• controlling, during a second period of time, the first charging unit to be turned off and the discharging unit to be turned on, to discharge a voltage of the energy storage capacitor to a preset voltage;
• controlling, during a third period of time, the discharging unit to be turned off and the second charging unit to be turned on, to charge the energy storage capacitor, wherein the voltage of the energy storage capacitor is a sum of the preset voltage and the data voltage after the third period of time;
• and
• controlling, during a fourth period of time, the second charging unit to be turned off, such that the energy storage capacitor is discharged to the gate electrode of driving transistor, so that the sub-pixels emit light.

A display panel, comprising:

• sub-pixels and a pixel drive circuit comprising:
• a first charging unit, wherein an input terminal of the first charging unit is configured for inputting a pre-charge voltage, and an output terminal of the first charging unit is connected to an energy storage capacitor, so as to charge the energy storage capacitor when the first charging unit is turned on;
• a discharging unit, wherein a first terminal of the discharging unit is connected to the energy storage capacitor, and a second terminal of the discharging unit is connected to a ground, so as to discharge a voltage of the energy storage capacitor to a preset voltage when the discharging unit is turned on;
• a second charging unit, wherein an input terminal of the second charging unit is configured for inputting a data voltage, and an output terminal of the second charging unit is connected to the energy storage capacitor, so as to charge the energy storage capacitor when the second charging unit is turned on;
• and
• a driving transistor, wherein a first electrode of the driving transistor is configured for inputting a power supply voltage, a second electrode of the driving transistor is configured for connecting with the sub-pixels, and a gate electrode of the driving transistor is connected to the energy storage capacitor, so as to emit light through the sub-pixels when the energy storage capacitor discharges the gate electrode of the driving transistor;
• wherein the second electrode of the driving transistor is connected to the sub-pixels, such that when the energy storage capacitor discharges to the gate electrode of the driving transistor, the driving transistor drives the sub-pixels to emit light.