DISPLAY SYSTEM, DISPLAY DEVICE, AND RELAY DEVICE

摘要

A playback signal outputted from a playback device is outputted via a relay device to two or more display devices, including a display device that is excellent for use when mounted on a user's head. A connection monitoring circuit inside a front-end box (40) monitors both a +5V signal of a source device connected via an HDMI to an HDMI input part (501), and an HPD signal of a sync device connected via an HDMI to a second output part (503). In addition, the connection monitoring circuit inside the front-end box (40) enables a repeater function for the HDMI sync device only when the +5V signal generated by the HDMI source device and the HPD signal generated by the HDMI sync device have been detected.