Fast data programming TFT pixel threshold voltage compensation circuit with two phase threshold compensation
US11087685B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2020 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Jul 10, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit for a display device provides enhanced performance by performing a first threshold compensation phase that also operates to pre-charge a compensating storage capacitor, and then performing a further second threshold compensation combined with data programming during a shortened programming time. During the first threshold compensation phase, the threshold voltage of the drive transistor is stored in the compensating storage capacitor. During the combined data programming and second threshold compensation phase, the data voltage is stored in a programming capacitor, and the drive transistor threshold voltage is also stored in the programming capacitor. As the threshold voltage already is stored at the storage capacitor, and thus the node where the storage capacitor and the programming capacitor connect has been pre-charged with the threshold voltage, the pre-charging effect shortens the time needed for the programming capacitor to store the threshold voltage, which results in a short programming time while achieving high compensation accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.