Patent ID: 8149231
Filing Date: 2012-04-03
Classification: G09G,H02M

Abstract:
1. An apparatus for supplying power source comprising: a boosting circuit configured to boost a battery voltage; a voltage adjusting circuit configured to control the boosting circuit so that the boosting circuit boosts the battery voltage up to a first voltage or a second voltage; and an outputting circuit configured to provide the first voltage to a first display device, down the second voltage and provide the downed second voltage to a second display device, wherein the outputting circuit includes a switching circuit configured to switch couple between the boosting circuit and the first display device, and a voltage down circuit configured to down the second voltage outputted from the boosting circuit and provide the down second voltage to the second display device, wherein in case of the switching circuit is turned on, the voltage down circuit is not activated, the first display is turned on, and the second display is turned off, wherein in case of the switching circuit is turned off, the voltage down circuit is activated, the first display is turned off, and the second display is turned on, wherein the second voltage has different magnitude from the first voltage, wherein the voltage down circuit includes: a regulator coupled between the boosting circuit and the second display device; resistors coupled in parallel to a ground terminal of the regulator; and a resistor coupled to an output terminal of the regulator.