Display apparatus, video signal transmission method for display apparatus, transmitting apparatus, and transmission method of video signal

A signal transmitting method for a display apparatus including:

• signal receiving unit that receives a first signal from an external device via a bidirectional transmission path through a plurality of channels by means of a differential signal;
• a communication unit that performs communication with the external device via two pairs of differential transmission paths contained in the transmission path and receives a notification of a connection state from the external device by means of at least one DC bias potential of the two pairs of differential transmission paths;
• and
• an image display unit that displays images by
• processing a video signal received by the signal receiving unit, the method comprising the steps of:
• receiving a second signal of a same video source as the first signal via the transmission path, the second signal being received via the transmission path based on whether recording is instructed by a user;
• transmitting a signal corresponding to the second signal received by the receiving step to another external device different from the external device;
• and
• wherein the two pairs of differential transmission paths are a reserved line and a Hot Plug Detect (HPD) line constituting a High Definition Multimedia Interface (HDMI) cable.

A transmitting apparatus, comprising:

• a first signal transmitting unit that transmits a first signal to an external device via a bidirectional transmission path through a plurality of channels by means of a differential signal;
• and
• a second signal transmitting unit that transmits a second signal of a same video source as the first signal to the external device via two pairs of differential transmission paths contained in the transmission path, the second signal being transmitted via the two pairs of differential transmission paths contained in the transmission path based on whether data indicating recording is instructed by a user is received via the transmission path, and notifies the external device of a connection state of the second signal transmitting unit by means of at least one DC bias potential of the two pairs of differential transmission paths;
• wherein the two pairs of differential transmission paths are a reserved line and a Hot Plug Detect (HPD) line constituting a High Definition Multimedia Interface (HDMI) cable.