Abstract: A display system and an operating method thereof are provided. The display system includes a display panel, a source driver, and a timing controller. The source driver is coupled to the display panel for providing a plurality of pixel voltages to the display panel. The timing controller has a transmission interface circuit and is coupled to the source driver. The timing controller detects whether an operation timing of the display system enters a vertical blanking (VBK) period. When the operation timing of the display system enters the VBK period, the timing controller turns off the transmission interface circuit and causes the source driver to enter an idle mode. When the operation timing of the display system is at a preset time before an end of the VBK period, the timing controller turns on the transmission interface circuit and wakes up the source driver.