Capacitive sensing device and detection method for an irregular conductive matter in a touch event
US10444921B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 17, 2017 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Dec 7, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04112
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A detection method for an irregular conductive matter in a touch event includes scanning a plurality of detection points to obtain a plurality of sensing signals of the detection points; computing a first signal summation of all positive signals among the sensing signals; obtaining a first change between the first signal summation and a previous first signal summation; computing a second signal summation of all negative signals among the sensing signals; obtaining a second change between the second signal summation and a previous second signal summation; setting a flag according to the first change and the second change when the first change and the second change are positive; clearing the flag according to the first change and the second change when the first change and the second change are negative; and disabling a reporting of at least one touch point when the flag exists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.