Self and mutual capacitance measurement in a touch screen
US9684418B1 · kind B1 · utility
9Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2014 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Nov 3, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0488
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A water-resistant capacitance sensing apparatus comprising a plurality of capacitive sense elements and a capacitance sensing circuit configured to measure both the mutual capacitance and self-capacitance on the plurality of capacitive sense elements.A method for water-resistant capacitance sensing, the method comprising performing a self-capacitance scan and a mutual capacitance scan, and detecting, by a processing device, a presence of an object with the plurality of sense elements. The method further determines whether the detected presence of the object is legitimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.