Electronic device having path of power supplied to display part switched according to whether external power is supplied

An electronic device operative from one of an external power supply and a battery outputting first power, the electronic device comprising:

• a display part;
• a system part to display an image through the display part;
• a plurality of system power converters to convert one of the external power supplied from the external power supply and the first power into a second power at different voltage levels for driving the system part;
• a display power converter to convert one of the second power output from one of the plurality of system power converters and the first power into a power for driving the display part, and supply the converted power to the display part;
• and
• a power controller to supply the second power from one of the plurality of system power converters as an input power of the display power converter if detected that the external power is supplied from the external power supply, and supply the first power from the battery as the input power of the display power converter if the external power is cut off from the external power supply.

An electronic device, comprising:

• a display part;
• a power converter;
• an inverter generating an operating voltage for the display part;
• a system part generating information to be displayed on the display part and operable from an output of the power converter;
• a battery;
• an input power detector which detects an availability of external power;
• and
• a switching controller controlling power to the inverter and the power converter, wherein:
• where, in a first mode, the input power detector detects the availability of the external power, the switching system supplies the external power to the power converter and to the inverter via the power converter;
• and
• where, in a second mode, the input power detector detects that the external power is not available, the switching system supplies battery power to the power converter and to the inverter independently of the power converter.