Untethered active pen and a method for communicating with a capacitive sensing device using the untethered active pen

摘要

A method for communicating with a capacitive sensing device using an untethered active pen. The method includes capacitively receiving a capacitive sensing signal at a capacitive receiving unit of the untethered active pen. The capacitive sensing signal is output from the capacitive sensing device. In addition, the method includes determining a first frequency and a first phase associated with the capacitive sensing signal. Moreover, the method includes transmitting at a second frequency and a second phase an amplified active pen signal at the capacitive sensing device from the untethered active pen. The amplified active pen signal has a second frequency and a second phase that correspond to the first frequency and the first phase.

主权项

1. A method for communicating with a capacitive sensing device using an untethered active pen comprising:
capacitively receiving a capacitive sensing signal at a capacitive receiving unit of said untethered active pen, said capacitive sensing signal output from said capacitive sensing device; determining a first frequency and a first phase associated with said capacitive sensing signal; and transmitting at a second frequency and a second phase an amplified active pen signal at said capacitive sensing device from said untethered active pen, said amplified active pen signal having said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal.