Patent ID: 8823669
Filing Date: 2014-09-02
Classification: G06F

Abstract:
1. An anti-noise unit adapted for a touch panel, the touch panel including a display module and a touch sensor, the display module generating a noise, the touch sensor outputting an abnormal signal, the abnormal signal including the noise and a sensing signal, the anti-noise unit comprising: a first filtering circuit adapted to receive the abnormal signal and permit the abnormal signal that is greater than a reference voltage to pass so as to form a first filtering signal; a second filtering circuit adapted to receive the noise and permit the noise that is greater than the reference voltage to pass so as to form a second filtering signal; and a comparison circuit adapted to receive the first filtering signal and the second filtering signal, and compares the first filtering signal with the second filtering signal so as to output a compared signal, wherein the compared signal is the sensing signal; wherein the first filtering circuit comprises: a first operational amplifier whose a positive phase input end adapted to receive the reference voltage, and a negative phase input end adapted to receive the abnormal signal wherein the first operational amplifier compares the abnormal signal with the reference voltage, and an output end of the first operational amplifier outputs a compared result; a first switch comprising: a second switch comprising: a third switch comprising: