Abstract: In a display apparatus and a power control circuit thereof, the power control circuit includes an image signal input terminal, a resistor-capacitor (RC) filter and a switch. The image signal input terminal is configured for receiving an image signal and providing a waiting-for-processing signal corresponding to the image signal. The RC filter is configured for receiving the waiting-for-processing signal and filtering out an alternating-current (AC) component of the waiting-for-processing signal to generate a switch control signal. The switch is electrically connected between a power supply and an electronic element, and configured for receiving the switch control signal and making the switch control signal control on-off state of the switch.