Frequency hopping for a capacitive touch screen controller
US11586322B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2020 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Apr 18, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04105
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device includes a force driver applying a force signal to a force node associated with a mutual capacitance between the force node and a sense node. A sensing circuit receives a sense signal from the sense node associated with the mutual capacitance between the force node and the sense node, and generates an output indicative of the sensed mutual capacitance. A control circuit controls the generation of the force signal to alternate between at least two different frequencies by generating consecutive pulses, with a given pulse of the consecutive pulses at a first of the at least two different frequencies. In a first operating state, a next pulse immediately succeeding the given pulse is at a second of the at least two different frequencies, and in a second operating state the next pulse immediately succeeding the given pulse is at the first of the at least two different frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.