TOUCH STYLUS AND OPERATING METHOD THEREOF
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Jul 2, 2014
filing date -
Jul 9, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A touch stylus and operating method thereof are disclosed. The touch stylus includes a power supply, a pressure sensing unit, a signal processing unit, and an output unit. The power supply is used to generate a constant current. The pressure sensing unit is coupled to the power supply and includes a changeable resistor. When the touch stylus touches a panel, the pressure sensing unit senses a pressure the panel provides to the touch stylus. A resistance of the changeable resistor is changed by the pressure, and an output voltage is generated in a voltage-dividing way. The signal processing unit is coupled to the pressure sensing unit and used to process the output voltage to generate an output signal. The output unit is coupled to the signal processing unit and used to output the output signal.
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