Fast data programming TFT pixel threshold voltage compensation circuit with improved compensation accuracy
US11114030B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2020 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Jul 10, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit for a display device provides enhanced performance by performing a partial threshold compensation during programming and performing further compensation independent of programming to achieve a short programming time while ensuring threshold compensation accuracy. The pixel circuit is operated in a relatively shortened duration first combined data programming and threshold compensation phase, and in a relatively prolonged duration second threshold compensation phase for improved compensation accuracy. During the combined programming and threshold compensation phase, a drive transistor is diode connected, and a data voltage is applied to a programming a capacitor that also stores a portion of a threshold voltage of the drive transistor. This permits a short programming time. During the prolonged threshold compensation phase, to further compensate the threshold voltage of the drive transistor for compensation accuracy, the drive transistor remains diode connected and a storage capacitor stores the threshold voltage of the drive transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.