Parasitic capacitance filter for single-layer capacitive imaging sensors
US9495046B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2013 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Mar 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An approach is provided for estimating and correcting parasitic responses of a touch sensor device. The input device measures a first capacitance signal generated by a first pixel that is covered at least partially by an input object. The input device measures a second capacitance signal generated by a second pixel that is covered at least partially by the input object. The input device measures a third capacitance signal generated by a third pixel. Based on at least the first capacitance signal and the second capacitance signal, the input device identifies a position of the input object within the sensing region. Based on the position of the input object, the input device identifies a trace covered by the input object and associated with the third pixel. The input device calculates an updated third capacitance signal by subtracting a correction amount from the third capacitance signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.