A video processing device comprises a display interface coupleable to a display device and a display controller configured to transmit a video signal via an output node of the display interface. The video signal comprises an active segment comprising video information and an inactive segment comprising synchronization information. The video processing device further comprises a display detector configured to determine whether the display device is coupled to the display interface based on a comparison of a first voltage at the output node during transmission of the inactive segment to a second voltage.