Background noise measurement and frequency selection in touch panel sensor systems
US8860432B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2012 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | Dec 16, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch panel sensor system that can dynamically measure noise and automatically switch to a frequency with minimal noise is described. The touch panel sensor system includes a sensor configured to detect a change in capacitance associated with a touch upon a touch panel. The system also includes a drive module configured to generate a drive signal having a first waveform characteristic (e.g., signal having a periodic waveform characteristic) during a first phase (e.g., sensor phase) and a second drive signal having a second waveform characteristic (e.g., constant voltage signal) during a second phase (e.g., noise detection phase). The first and second drive signals are configured to drive the sensor. The system also includes a measuring module coupled to the sensor that is configured to measure noise having the first waveform characteristic (e.g., periodic waveform characteristic) during the second phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.