CAPACITIVE TOUCH DEVICE WITH HIGH SENSITIVITY AND OPERATING METHOD THEREOF
First Claim
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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, whereinthe 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, anda frequency response of the second filter circuit is determined according to a frequency response of the first filter circuit.
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Abstract
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.
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Citations
20 Claims
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1. A capacitive touch device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A capacitive touch device comprising:
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a touch panel comprising a plurality of detection electrodes configured to respectively form a self-capacitor; and a control chip comprising; an emulation circuit configured to output a reference signal; a plurality of programmable filters respectively coupled to the detection electrodes; and a subtraction circuit, coupled to the emulation circuit, configured to be sequentially coupled to the programmable filters in a self-capacitive mode, and perform a differential operation on the reference signal outputted by the emulation circuit and a detection signal outputted by the coupled programmable filter to output a differential detected signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An operating method of a capacitive touch device, the capacitive touch device comprising a touch panel and a control chip, the touch panel comprising a plurality of drive electrodes and a plurality of receiving electrodes extending along different directions, and the control chip comprising a plurality of drive circuits, a plurality of detection capacitors, a subtraction circuit and an anti-aliasing filter, the operating method comprising:
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respectively coupling, in a self-capacitive mode, the drive circuits to first ends of the drive electrodes via the detection capacitors, and respectively coupling the subtraction circuit to second ends of the drive electrodes; and respectively coupling, in a mutual capacitive mode, the drive circuits to the first ends of the drive electrodes without passing the detection capacitors, and respectively coupling the anti-aliasing filter to second ends of the receiving electrodes without passing the subtraction circuit. - View Dependent Claims (18, 19, 20)
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Specification