Patent ID: 7446432

Claim:
An electronic device operable from an external power supplied from an adapter or a first power supplied from a battery, the electronic device comprising: a display part; a power converter arranged to convert the external power from the adapter into a second power having a preset voltage level; a display power converter arranged to convert the first power from the battery or the second power from the power converter into a power for driving the display part, and supply the power for driving the display part to the display part; a first power switch coupled to the adapter, the battery, and the power converter, and operable to selectively supply the external power from the adapter to the power converter, or the first power from the battery to the power converter; a second power switch coupled to the power converter, the battery, and the display power converter, and operable to selectively supply the first power from the battery to the display power converter, or the second power from the power converter to the display power converter; and a switch controller arranged to; control the first power switch to supply the external power from the adapter to the power converter when the external power is being supplied from the adapter, and supply the first power from the battery to the power converter when the external power is not being supplied from the adapter, and control the second power switch to supply the second power from the power converter to the display power converter when the external power is being supplied from the adapter, and supply the first power from the battery to the display power converter when the external power is not being supplied from the adapter.