Noise handling in capacitive touch sensors
US8054090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2008 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Jan 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0443
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a capacitive sensor of the type having X electrodes which are driven and Y electrodes that are used as sense channels connected to charge measurement capacitors, signal measurements are made conventionally by driving the X electrodes to transfer successive packets of charge to the charge measurement capacitors. However, an additional noise measurement is made by emulating or mimicking the signal measurement, but without driving the X electrodes. The packets of charge transferred to the charge accumulation capacitor are then indicative of noise induced on the XY sensing nodes. These noise measurements can be used to configure post-processing of the signal measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.