Touch detection techniques for capacitive touch sense systems
US8248084B2 · kind B2 · utility
20Cited by
250References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2011 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Mar 14, 2031 |
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.