Integrated touch sensing and force sensing in a touch detection device
US10613695B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2018 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Oct 15, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04107
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This application is directed to a touch detection device that has a plurality of sense electrodes, at least one force electrode, and a processing device electrically coupled to the sense electrodes and the force electrode. The sense electrodes are disposed substantially in parallel with the force electrode and separated therefrom by at least an air gap. While operating in a touch sensing state, the processing device leaves the force electrode electrically afloat, measures self-capacitance of each of a subset of sense electrodes, and detects a touch location of an object. While operating in a force sensing state, the processing device drives the force electrode by a transmit signal, measures mutual capacitance of each of a subset of sense electrodes with respect to the force electrode, and detects a touch force on a touch location when an object touches a top surface of the touch detection device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.