Patent ID: 8823669

Claim:
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 first end adapted to receive the abnormal signal; a second end adapted to output a first filtering signal; and a control end electrically connected to the output end of the first operational amplifier, thereby controlling whether the first end of the first switch electrically contacts the second end of the first switch or not; a second switch comprising: a first end electrically connected to the second end of the first switch; a second end electrically connected to the reference voltage; and a control end electrically connected to the output end of the first operational amplifier, thereby controlling whether the first end of the second switch electrically contacts the second end of the second switch or not; and a third switch comprising: a first end electrically connected to the second end of the first switch; a second end electrically connected to the reference voltage; and a control end adapted to receive the abnormal signal, thereby controlling whether the first end of the third switch electrically contacts the second end of the third switch or not.