Mutual capacitive touch-sensitive apparatus and method applying inverse signals to electrodes
US11899876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2020 |
| Grant date | Feb 13, 2024 |
| Priority date | — |
| Expiry date | Aug 10, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch-sensitive apparatus includes drive electrodes, comprising at least first and second electrodes; a receiver electrode; drive circuitry configured to generate first and second time-varying voltage signals, wherein the time-varying voltage signals are the inverse of one another; and control circuitry that performs a first measurement on the receiver electrode during a first time period, wherein the control circuitry supplies at least one of the time-varying voltage signals to the drive electrodes during the first time period; and perform a second measurement on the at least one receiver electrode during a second time period, wherein the control circuitry is configured to supply at least one of the time-varying voltage signals to the drive electrodes during the second time period; and determine a resultant signal corresponding to the mutual capacitance between the first electrode and the receiver electrode based on both the first measurement and the second measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.