Noise handling in capacitive touch sensors

Details Noise handling in capacitive touch sensors Noise handling in capacitive touch sensors

2008-10-22

2011-11-08

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S678000

Reexamination Certificate

active

08054090

ABSTRACT:
In a capacitive sensor of the type having X electrodes which are driven and Y electrodes that are used as sense channels connected to charge measurement capacitors, signal measurements are made conventionally by driving the X electrodes to transfer successive packets of charge to the charge measurement capacitors. However, an additional noise measurement is made by emulating or mimicking the signal measurement, but without driving the X electrodes. The packets of charge transferred to the charge accumulation capacitor are then indicative of noise induced on the XY sensing nodes. These noise measurements can be used to configure post-processing of the signal measurements.

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patent: 2002/0186210 (2002-12-01), Itoh
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“International Application Serial No. PCT/US2009/061543, Search Report mailed Jan. 7, 2010”, 3 pgs.
“International Application Serial No. PCT/US2009/061543, Written Opinion mailed Jan. 7, 2010”, 4 pgs.

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