Touch detection techniques for capacitive touch sense systems
US9494627B1 · kind B1 · utility
2Cited by
276References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 21, 2012 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Nov 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960705
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique for recognizing and rejecting false activation events related to a capacitance sense interface includes measuring a capacitance value of a capacitance sense element. The measured capacitance value is analyzed to determine a baseline capacitance value for the capacitance sensor. The capacitance sense interface monitors a rate of change of the measured capacitance values and rejects an activation of the capacitance sense element as a non-touch event when the rate of change of the measured capacitance values have a magnitude greater than a threshold level, indicative of a maximum rate of change of a touch event.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.