Patent ID: 8356196

Claim:
A display apparatus, comprising: a command receiver configured to receive power on or off command; a power supply unit configured to receive AC power, and to supply power to the display apparatus by using the received AC power; and a control unit coupled to the command receiver and the power supply unit, configured to determine whether auxiliary power exists when the power off command is received, configured to, based on a determination that the auxiliary power exists when the power off command is received, enter a first power saving mode that powers the control unit using the auxiliary power instead of power that is available from the power supply unit by using the received AC power, and configured to, based on a determination that the auxiliary power does not exist when the power off command is received, enter a second power saving mode that powers the control unit using power from the power supply unit generated by using the received AC power, wherein the control unit is configured for two modes, in a first mode, based on a determination that the auxiliary power exists when the power off command is received, the control unit is configured to cause the apparatus to enter the first power saving mode in which the auxiliary power is withheld from the display apparatus excluding the control unit and the power supplied from the power supply unit is withheld from the display apparatus including the control unit and, in a second mode, based on a determination that the auxiliary power does not exist when the power off command is received, the control unit is configured to cause the apparatus to enter the second power saving mode in which the power from the power supply unit is supplied to the control unit and the power from the power supply unit is withheld from the display apparatus excluding the control unit.