Patent ID: 7667706

Claim:
A data relay device, provided between a sink unit, which stores EDID (Extended Display Identification Data) data representing display attributes and presents input data based on the EDID data, and a source device, the data relay device comprising: an EDID memory configured to store the EDID data; a control unit configured to: deactivate a hot plug line until a completion of storing the EDID data in the EDID memory, and activate the hot plug line after the EDID data is stored in the EDID memory, whereby the source device can read the EDID data from the EDID memory via an I 2 C bus; a first data bus which transfers the EDID data from the display unit to the EDID memory; and a second data bus which transfers the read EDID data stored in the EDID memory to the source device.