Differential sensing in touch screen controller with improved noise rejection
US10078395B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2016 |
| Grant date | Sep 18, 2018 |
| Priority date | — |
| Expiry date | Mar 20, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/85
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is an electronic device including a display layer generating display noise based on scanning thereof and a sensing layer including a plurality of sense lines. The display noise is capacitively coupled from the display layer to each of the plurality of sense lines of the sensing layer. A differential charge converter circuit has first and second differential inputs respectively coupled to corresponding ones of the plurality of sense lines, and first and second reference inputs. The first and second reference inputs of the differential charge converter circuit are coupled to voltage references during a reset period, and are decoupled from the voltage references during a scan period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.