Touch drive circuit, touch display device, and method for driving touch display device
US10572709B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2017 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Jan 3, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch display device can sense a fingerprint touch using a pixel electrode and a data line. Before a capacitance variance of the pixel electrode in a fingerprint touch sensing interval is sensed, the voltage of only the data line is fixed to be identical to a voltage applied to a (+) terminal of an operational amplifier of a fingerprint touch sensing unit so that a capacitance variance of the data line is not transferred to the fingerprint touch sensing unit, and a capacitance variance of only the pixel electrode may be transferred. The capacitance variance of only the pixel electrode, not including the capacitance variance of the data line, is transferred to the fingerprint touch sensing unit so that the distinction between a peak and a valley of a fingerprint touching a display panel is enhanced. Therefore, a fingerprint touch sensing performance can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.