A touch sensing apparatus includes: a differential signal source for generating two alternating current signals with same frequency and reverse phase; two conductors connected to a cathode output end and an anode output end of the differential signal source; a sensor for receiving a noise generated by a contact of an object; wherein the sensor and the two conductors form two simulated capacitors that result in offsetting environmental noise; a detector having a first input end and a second input end, the detector upon receiving the noise transferred from the sensor resulting in voltage differences between the first and second input ends thereof, and outputting a signal; and a rectifying circuit for rectifying the alternating current signals generated by the differential signal source and simultaneously generating a noise.
申请公布号
US7714848(B2)
申请公布日期
2010.05.11
申请号
US20060309158
申请日期
2006.07.03
申请人
HONG FU JIN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD.;HON HAI PRECISION INDUSTRY CO., LTD.