Patent ID: 8681094

Claim:
A display apparatus comprising: an interface which is connectable to a cable and is operable to transmit and receive signals; a first switch which is operable to output a cable connection sensing signal; a memory which stores extended display identification data (EDID); a second switch which is operable to output the EDID stored in the memory; and a control unit which determines whether the display apparatus is in a power on state or a power off state, and controls the first switch and the second switch based on a result of the determination, wherein the first switch blocks the cable connection sensing signal when the control unit determines that the display apparatus is in the power off state and the interface is connected to the cable, and releases the blocking state and outputs the cable connection sensing signal when the control unit determines that the display apparatus is in the power on state, wherein the second switch blocks the output when the control unit determines that the display apparatus is in the power off state and the interface is connected to the cable, and releases the blocking state when the control unit determines that the display apparatus is in the power on state, and wherein the power off state includes a hard power off state and a soft power off state.