Capacitive touch detecting device capable of self-calibration
US10996801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2019 |
| Grant date | May 4, 2021 |
| Priority date | — |
| Expiry date | Dec 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0418
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a capacitive touch detecting device including a sampler circuit and a detection-and-calibration circuit. The sampler circuit executes the following steps: charging a capacitor when the level of a clock signal is high, wherein the capacitor's capacitance is a first capacitance provided a touch event occurs and is a second capacitance provided the touch event doesn't occur, the first capacitance is greater than the second capacitance and related to a parasitic capacitance and a touch capacitance, and the second capacitance is unrelated to the touch capacitance; sampling a voltage determined by the capacitor during the level transition of the clock signal to generate a sample value; and discharging the capacitor when the level of the clock signal is low. The detection-and-calibration circuit determines whether the touch event occurs and whether at least one parameter needs to be updated according to the sample value and at least one parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.