Patent ID: 8266335

Claim:
A video display device comprising: connectors to which cables transmitting video signals are connected; a display panel displaying video by the video signal inputted to the connector from an external device through the cable; a display control unit displaying connector indications indicating the connectors on the display panel; a cable detection unit outputting a step waveform signal having a rising time of approximately 2 nanoseconds to the connector and detecting connection/disconnection of the cable to the connector based on a reflected signal of the step waveform signal, and wherein the display control unit changes the appearance of the connector indications displayed on the display panel according to a detection output of the cable detection unit, the step waveform signal being coupled to a multiple of waveform shaping circuits, at least one of the waveform shaping circuits comprising a dummy output resistance and a reference load, the values of the dummy output resistance and the reference load being selected to set a maximum margin for cable detection.