TFT pixel threshold voltage compensation circuit with data programming from drain of the drive TFT
US11049454B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2020 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Jul 29, 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 drain-side initialization and data programming with respect to the drive transistor. The pixel circuit is operable in an initialization phase, a combined threshold compensation and data programming phase, and an emission phase, the pixel circuit including a drive transistor configured to control an amount of current to a light-emitting device during the emission phase depending upon a voltage applied to a gate of the drive transistor, and the drive transistor having a first terminal and a second terminal with the first terminal being electrically connected during the emission phase to a first voltage supply line that supplies a driving voltage. The second terminal of the drive transistor is electrically connected to a data voltage supply line that supplies a data voltage during the initialization phase and the combined threshold compensation and data programming phase to compensate a threshold voltage of the drive transistor and to program the data voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.