Active matrix capacitive sensor for common-mode cancellation
US9880688B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2015 |
| Grant date | Jan 30, 2018 |
| Priority date | — |
| Expiry date | Jan 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/047
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This disclosure generally provides an input device that includes a plurality of sensor modules coupled to sensor electrodes arranged in a matrix that measure capacitive sensing signals corresponding to the electrodes. To mitigate the effect of capacitive coupling between a sensor electrode being sensed and its neighbors in the matrix, the input device drives the neighboring electrodes in a same manner as the selected sensor electrode so that there is little or no voltage difference between the sensor electrode being sensed and its neighbors. For example, during a drive phase, the electrode being sensed and the neighboring electrodes are coupled to the same charge voltage. During a read phase, the neighboring electrodes and the selected electrode may be coupled to the same reference voltage—e.g., ground—so there is again no voltage difference between the electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.