Patent ID: 8451378

Claim:
A video device to generate analog video signals to a plurality of display devices, the video device comprising: a video processing chip converting input video data into the analog video signals; a plurality of video output interface circuits receiving the analog video signals, and transmitting the analog video signals to a corresponding plurality of display devices, wherein the video output interface circuit comprises a filter circuit filtering noise in the analog video signals, an amplifier circuit amplifying the filtered analog video signals, a match circuit configured for impedance matching between the video output interface circuit and the display device, and a blocking circuit blocking direct current (DC) interference; the blocking circuit comprising a first end connected to the match circuit and a second end configured as an output of the video output interface circuit; and a plurality of detection circuits individually detect voltage of horizontal sync signals within the analog video signals output from the plurality of video output interface circuits, and correspondingly generating a plurality of feedback signals to the video processing chip to indicate connection of the plurality of video output interface circuits to the corresponding plurality of display devices.