Self-capacitance measurement
US9372582B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2012 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Sep 30, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a method includes modifying an amount of charge of a capacitance of a touch sensor. The modified amount of charge resulting in a voltage at the capacitance being a first pre-determined voltage level. The method also includes applying a first pre-determined amount of charge to the capacitance. The application of the first pre-determined amount of charge to the capacitance modifying the voltage at the capacitance from the first pre-determined voltage level to a first charging voltage level. The method also includes determining a first difference between the first charging voltage level and a reference voltage level; and determining whether a touch input to the touch sensor has occurred based on the first difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.