Ene Technology Inc.

Chao-Ming Lee

King-Lien Lee

A method for detecting presence of an interference source is to be performed by a touch sensing system that stores a threshold capacitance difference. The method includes the steps of sampling capacitances periodically within a time period for obtaining a base capacitance value; sensing a comparison capacitance after the time period; computing an absolute difference between the comparison capacitance and the base capacitance value; and determining that the interference source is present when the comparison capacitance is smaller than the base capacitance value and the absolute difference is greater than the threshold capacitance difference.

Method of detecting presence of interference source, and touch sensing system

A touch and proximity sensing device includes a circuit board and a sensed signal processing unit including only one sensed signal conversion engine. The circuit board includes a capacitor sensing electrode and a grounding conductor foil disposed on opposite surfaces of the circuit board, and has a proximity sensing electrode formed thereon. The grounding conductor foil is spaced apart from the proximity sensing electrode in a planar direction parallel to the surfaces of the circuit board. The sensed signal conversion engine is spaced apart from the capacitor sensing electrode and the proximity sensing electrode in the planar direction and detects electric sensed signals from the capacitor sensing electrode and the proximity sensing electrode.

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Hsin-Chu, Taiwan

Chao-Ming Lee