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Portable electronic device and unlocking method using stylus

  • US 8,537,130 B2
  • Filed: 06/30/2011
  • Issued: 09/17/2013
  • Est. Priority Date: 11/18/2010
  • Status: Active Grant
First Claim
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1. A portable electronic device, comprising:

  • a touch screen;

    a memory;

    at least one processor;

    a detection circuit operable to detect a voltage indicating whether a stylus is received in a receiving space of the portable electronic device, wherein the detection circuit comprises a switch that is activated when the stylus is received in a receiving space of the portable electronic device, and is inactive when the stylus is not received in the receiving space; and

    a General Purpose Input/Output (GPIO) pin that is grounded in response to the switch being active, and the GPIO pin is set at a high voltage in response to the switch being inactive;

    an analog/digital converter operable to transform the voltage into a corresponding logic value;

    one or more programs that are stored in the memory and are executed by the at least one processor, the one or more programs comprising;

    a receiving module operable to receive the logic value;

    a detection module operable to detect whether the voltage is changed from a low voltage to a high voltage according to the logic value; and

    an unlocking module operable to control the at least one processor to unlock or wake up the portable electronic device if the voltage is changed from a low voltage to a high voltage.

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