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TOUCH SCREEN DEVICE

  • US 20120019458A1
  • Filed: 01/21/2011
  • Published: 01/26/2012
  • Est. Priority Date: 07/23/2010
  • Status: Active Grant
First Claim
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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;

    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.

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