Touch analog front end and touch sensor controller having the same
US9870095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2015 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Jan 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04101
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch analog front-end (AFE) and a touch sensor controller (TSC) are provided. The touch AFE includes a transmitter configured to charge a touch panel and a receiver configured to sense the touch panel. The receiver includes a charge-to-voltage (C2V) converter configured to convert an amount of change of capacitance received from the touch panel into a voltage signal, a filter configured to filter a noise from the voltage signal, resulting in a filtered voltage signal, an integrator configured to accumulate the filtered voltage signal, and a polarity detection circuit configured to monitor the filtered voltage signal and to control the integrator to invert a polarity of the filtered voltage signal when it is negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.