Pixel circuit, active matrix organic light emitting diode display panel, display apparatus, and method of compensating threshold voltage of driving transistor
US11127350B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2017 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | May 14, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0861
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit includes a first transistor having a bottom gate and a top gate, a drain supplied with a high-level power-supply voltage, and a source coupled to a light-emitting diode (LED). The bottom gate is provided with a first voltage signal and the source is provided with a second voltage signal in a compensation period during which a present value of a threshold voltage of the first transistor is sensed at the source and a third voltage signal is determined based on the present value of the threshold voltage. The top gate is configured to be provided with the third voltage signal in an emission period to reduce the present value of the threshold voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.