Capacitive touch system
US9933904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2014 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Aug 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns a capacitive touch system comprising: an active stylus (800) configured so as to continuously emit a signal a capacitive touch device (200) configured to be in a reset phase (1000), followed by a finger touch sensing phase (2000), the finger touches being sensed exclusively during the finger touch sensing phase (2000). The capacitive touch device (200) is configured to sense the signal from the active stylus (800) during the reset phase (1000). The capacitive touch device (200) comprises at least one charge sensor (208, 213) comprising a charge sensor amplifier (305) comprising an input (CSi) and an output (csaout), and a switch (Sw1) between this input (CSi) and this output (csaout). The charge sensor amplifier (305) is arranged for conveying the signal of the active stylus (800) through a non-zero resistance value (Ron) of the switch (Sw1) during the reset phase (1000).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.