Display unit, display unit driving method and display system

A display system for display images comprising a gate driver, a source driver and a display device, wherein the display device comprises a plurality of display units, and each display unit comprises:

• a capacitor comprising two terminals for respectively receiving a drain control signal (VDn) from the source driver and a common voltage signal (Vcom), and being charged or discharged according to a voltage difference between the drain control signal and the common voltage signal;
• a pixel comprising two terminals for respectively receiving the drain control signal and the common voltage signal, and displaying in response to the voltage difference between the drain control signal and the common voltage signal;
• and
• a switch comprising a first terminal receiving a source control signal (VSn), a second terminal receiving a switch control signal (VGn) from the gate driver and a third terminal coupled to the pixel and the capacitor, wherein the switch is turned on according to the switch control signal and transmits the source control signal through the third terminal to the pixel and the capacitor,
• wherein the switch is turned on twice within every one frame according to the switch control signal, and when the switch is turned on for the first time, the pixel displays, and when the switch is turned on for the second time, the capacitor is discharged.