Analogue external compensation system for TFT pixel OLED circuit
US10636357B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Dec 10, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0295
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display system includes a pixel circuit and an analogue external compensation system that is operable with the pixel circuit to compensate for differences in a property of the drive transistor and/or light-emitting device. The display system includes a pixel circuit having a drive transistor configured to control an amount of current to a light-emitting, and an analogue external compensation system that is operable with the pixel circuit. The analogue external compensation system includes a current regulator that regulates a current applied to a first terminal of the pixel circuit to approximate a current supplied through the drive transistor to the light-emitting device; a current mirror that receives the current from the regulator and mirrors said current from the regulator to output a mirrored current; a current source that supplies a programming reference current; and an integrator that receives inputs of the mirrored current and the programming reference current. The integrator converts a difference between the mirrored current and the programming reference current to an adjusted data voltage that is applied to a second terminal of the pixel circuit to compensate for a varia…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.