Patent ID: 9207793
Filing Date: 2015-12-08
Classification: G06F

Abstract:
1. A touch panel comprising a plurality of signal input ends and a plurality of signal output ends, wherein the touch panel further comprises at least one signal detecting unit which comprises: a signal inputting unit, a preamplifier, and a signal separating unit; wherein the signal inputting unit, which is connected to a signal input end of the touch panel, is configured to input driving signals respectively having n frequencies, wherein n is an integer not less than 2; the preamplifier, which is connected to a signal output end of the touch panel, is configured to acquire the output signals outputted from the touch panel, and amplify and output the output signals to the signal separating unit; the signal separating unit, which is connected to the preamplifier and comprises n band-pass filters, is configured to separate the signals respectively having n frequencies, wherein, the preamplifier further comprises a feedback network, wherein the feedback network comprises at least two feedback branches connected in parallel, wherein one of the feedback branches comprises a resistor, and each remaining feedback branch comprises a resistor and a switch connected in series, and the resistance of the feedback network is changed by controlling the switches.