Patent ID: 8345035

Claim:
A liquid crystal display, comprising: a liquid crystal panel adapted to be switchable between a normal mode for displaying images and a standby mode; a control circuit electrically coupled to the liquid crystal panel configured for switching the liquid crystal panel between the normal mode and the standby mode according to video signals transmitted thereto, and switching the liquid crystal panel to the standby mode when no video signal has been output to the control circuit from an external video source within a predetermined time period; a power board configured for providing a power voltage to the control circuit; and a first switch circuit configured to receive an auxiliary power voltage from the video source, and output the auxiliary power voltage to the control circuit when receiving a control signal indicating that the liquid crystal panel is in the standby mode from the control circuit; wherein when the liquid crystal panel is in the standby mode, the control circuit outputs a corresponding feedback signal to stop the power board from providing the power voltage to the control circuit.