Highly efficient charge pump synchronized to the drive signal of a touch screen system
US10248256B2 · kind B2 · utility
0Cited by
2References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2018 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Aug 7, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An alternating current (AC) drive signal having a first frequency and a high logic level at a boosted supply voltage is applied to drive a capacitive sensing line of a capacitive touch panel. The boosted supply voltage is generated by boosting an input voltage. The voltage boosting is effectuate by a charge pump circuit operating synchronous to assertion of the AC drive signal with a charge transfer time that is adaptable to different capacitive load conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.