Touch sensing high-low driving scheme for in-cell touch LCD display
US10452196B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2016 |
| Grant date | Oct 22, 2019 |
| Priority date | — |
| Expiry date | Sep 16, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitive sensing method comprising: driving a first excitation signal onto a sensor electrode, and driving a second excitation signal onto the embedded electrodes. Either the first or the second excitation signal has voltage oscillations of constant first amplitude, while the other has voltage oscillations of varying second amplitude. The second amplitude varies between a high amplitude value that is larger than the first amplitude by an amplitude difference and a low amplitude value that is smaller than the first amplitude by the same amplitude difference. The method further comprises using one or more integrators to integrate an electric current due to combined voltage oscillations of the first and the second excitation signals within an integration cycle, and generate an integrated signal for detecting a capacitive change on the sensor electrode; wherein the integration cycle comprises a plurality of voltage oscillations of the first and the second excitation signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.