CAPACITIVE TOUCH DEVICE WITH HIGH SENSITIVITY AND OPERATING METHOD THEREOF

摘要

There is provided a capacitive touch device including a touch panel and a control chip. The touch panel includes a detection electrode configured to form a self-capacitor. The control chip includes an emulation circuit and a subtraction circuit. The emulation circuit is configured to output a reference signal. The subtraction circuit is coupled to the emulation circuit and the detection electrode, subtracts the reference signal outputted by the emulation circuit from a detected signal outputted by the detection electrode to output a differential detected signal, and identifies a touch event according to an amplified differential detected signal so as to improve the touch sensitivity.

主权项

1. A capacitive touch device comprising:
a touch panel comprising a detection electrode configured to form a self-capacitor; and a control chip comprising a detection capacitor, an input resistor, an amplifying circuit and an emulation circuit, wherein the detection capacitor, the self-capacitor, the input resistor and the amplifying circuit are configured to form a first filter circuit, the emulation circuit is configured to form a second filter circuit, and a frequency response of the second filter circuit is determined according to a frequency response of the first filter circuit.