Capacitive touch sensor
US11855623B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2022 |
| Grant date | Dec 26, 2023 |
| Priority date | — |
| Expiry date | Jul 22, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960705
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitive touch sensor includes a touch interface, a switch, and a sensing circuit. The switch circuit switches based on sensing conditions of self-capacitance and mutual capacitance. The sensing circuit is used for both the self-capacitance mode and the self-capacitance mode to simplify circuit structure and save circuit area and power consumption. The output sensing voltage from the sensing circuit is stable. A differential mode is designed to improve noise interference and enhance accuracy of judging the touch effect. Then, the self-capacitance mode is utilized for the areas of possible touches to save operation time for the capacitance mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.