Patent ID: 8519985
Filing Date: 2013-08-27
Classification: G06F,H02J

Abstract:
1. A touch screen device, comprising: a circuit board including a power control unit; a power input port located on the circuit board; a main battery electronically connected to the power input port; and a stylus including a backup battery electronically connected to the power input port, the stylus further comprising a body portion and an extension portion extending from one end of the body portion, the extension portion defining a receiving groove for receiving the backup battery, the receiving groove comprising a bottom surface, a through hole being defined on the bottom surface; an opening being defined on a side surface of the extension portion; wherein the power control unit detects the voltage value of the main battery, and compares the voltage value of the main battery with a predetermined voltage of the touch screen device; according to the comparative result, the power control unit switches between the main battery and the backup battery to provide power supply to the touch screen device; if the voltage value of the main battery is below the predetermined voltage needed to operate the touch screen device, the backup battery powers the touch screen device, and the main battery is disconnected from the power input port under the control of the power control unit; if the voltage value of the main battery is not below the predetermined voltage needed to operate the touch screen device, the main battery powers the touch screen device, and the backup battery is disconnected from the power input port under the control of the power control unit.