Touch sensing
US9760192B2 · kind B2 · utility
2Cited by
378References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2012 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Nov 7, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960775
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus varying, by interval, a frequency of a drive signal applied to one electrode of each of a plurality of electrode pairs, select a frequency corresponding to the frequency of the drive signal, monitor changes in capacitance of each of the electrode pairs through receive signals at the selected frequency, from the other electrode of each of the plurality of electrode pairs; and determine a position of at least two objects, which are simultaneously on a touch device, according to the monitored capacitance changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.