Compensation method for touch sensor system
US8170822B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2009 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Jan 20, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A compensation method devoid of operating voltage calibration, establishing fundamental linearity calibration table and inputting, and detecting the actual operating voltage is disclosed. The compensation method comprises the steps of: a) turning off a switch in a touch sensor system; b) initializing the touch sensor system and measuring a reference frequency outputted from a oscillator in the touch sensor system; c) turning on the switch and measuring a first frequency outputted from the oscillator; and d) deducting the first frequency from the reference frequency so as to obtain a frequency difference; and e) comparing the difference with a predetermined value, and judging based upon the difference if the touch sensor system is touched by a foreign object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.