Patent ID: 8411073

Claim:
A method comprising: providing a video signal for transmission via an output node of a display interface of a video processing device, the display interface coupleable to a display device and the video signal comprising an active segment comprising image information and an inactive segment comprising synchronization information, wherein providing the video signal comprises: providing a predetermined first current to the output node during transmission of both the active segment and the inactive segment, the display device being configured to latch the first current as a reference black level during the inactive segment; and providing a second current representative of the active segment to the output node during transmission of the active segment, wherein a total current provided to the output node during transmission of the active segment is equal to a sum of the first current and the second current; and determining 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 an inactive component of the inactive segment via the output node to a reference voltage, the first voltage generated at the output node in response to providing the first current to the output node.