TFT pixel threshold voltage compensation circuit
US10714008B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2019 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | Jun 3, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0262
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit for a display device employs a two-capacitor configuration, in which during the emission phase, the first and second plates of the capacitors respectively are electrically connected to each other to provide more stability to the gate voltage of the drive transistor. The pixel circuit also is operable in a combined threshold compensation and data programming phase to compensate for variations in the characteristics of the drive transistor and the light-emitting device. During a portion of the combined threshold compensation and data programming phase the drive transistor becomes diode-connected such that the gate and the second terminal of the drive transistor are electrically connected, wherein a threshold voltage of the drive transistor is compensated while the drive transistor is diode-connected. A first capacitor has a first plate that is connected to the gate of the drive transistor and a second plate that is connected to a node N1 at the light-emitting device, and a second capacitor has a first plate that is connected to the gate of drive transistor and the first plate of the first capacitor, and a second plate that is electrically connected to the node N1 duri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.