Method and apparatus for capacitive sensing
US10126893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2014 |
| Grant date | Nov 13, 2018 |
| Priority date | — |
| Expiry date | May 20, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960715
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention provide a capacitive sensing apparatus, a manufacturing and operation method thereof and an electronic device including the capacitive sensing apparatus. An apparatus includes first capacitive sensing unit(s) and second capacitive sensing unit, and a control unit. The control unit is configured to control periodic charging of the capacitive sensing units, determine first voltage change(s) for the first capacitive sensing unit(s) and second voltage change(s) for the second capacitive sensing unit(s), and calculate, for the first capacitive sensing unit(s), a signal-to-noise ratio value based on the first voltage change(s) and the second voltage change(s). Sensing results of first capacitive sensing unit(s) may be calibrated based on the sensing results of second capacitive sensing unit(s), thereby reducing influence of environmental changes on stability and sensitivity of a capacitive sensing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.