Touch detection device including a set of capacitors and used to detect a touch event
US10048798B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2017 |
| Grant date | Aug 14, 2018 |
| Priority date | — |
| Expiry date | Mar 20, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch detection device includes a processing unit, a first capacitor and a second capacitor. The processing unit has an output terminal for outputting a first analog signal, and an input terminal for receiving a second analog signal. The first capacitor has an adjustable first capacitance. The first capacitor includes a first terminal coupled to the output terminal of the processing unit, and a second terminal coupled to the input terminal of the processing unit. The second capacitor has a second capacitance. The second capacitor includes a first terminal coupled to the input terminal of the processing unit, and a second terminal coupled to a ground terminal. The first capacitance is adjusted to be substantially equal to the second capacitance. The processing unit determines whether a touch event is triggered according to variation of voltage level of the second analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.