Absolute capacitive sensing using sensor electrode pre-emphasis
US9823787B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2014 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | Apr 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A processing system comprises a sensor module and a determination module. The sensor module is configured to drive a modulated signal on to a sensor electrode to achieve a target voltage on the sensor electrode during a first portion of a sensing cycle, wherein the modulated signal comprises a first voltage that is beyond a level of the target voltage and which is driven for a first period of time and a second voltage that is at the target voltage and which is driven for a second period of time that follows the first period of time. The determination module is configured to determine an absolute capacitance of the sensor electrode during the first portion of the sensing cycle after driving the second voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.