TFT compensation circuit for display device using reference current
US10497310B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2018 |
| Grant date | Dec 3, 2019 |
| Priority date | — |
| Expiry date | Mar 23, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit for a display device includes a drive transistor configured to control an amount of current to a light-emitting device during an emission phase depending upon a voltage applied to a gate of the drive transistor; a second transistor connected to the gate of the drive transistor, wherein the second transistor is in an on state during a combined programming and compensation phase and in an off state during the emission phase, and when the second transistor is in an on state the drive transistor becomes diode-connected such that a gate and a second terminal of the drive transistor are connected through the second transistor; a third transistor connected to the second terminal of the drive transistor, wherein the third transistor is in an on state during the combined programming and compensation phase to permit a reference current to be applied through the drive transistor, and is in an off state during the emission phase to remove the reference current; and a capacitor having a first plate that is connected to the gate of the drive transistor and a second plate that is connectable to a data voltage during the combined programming and compensation phase. A threshold volt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.