Active matrix electroluminescent display device
US6356029B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Oct 2, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an active matrix electroluminescent display device the drive current through an EL display element (20) in each pixel (10) in a drive period is controlled by a driving device (22) based on a drive signal applied to the pixel in preceding address period and stored as a voltage on an associated storage capacitor (36). In order to counteract the effects of display element ageing through which the light output of an element for a given drive signal level diminishes over time, the pixel includes a feedback circuit (40, 45, 47, 48) which is responsive to the potential difference across the display element in an initial part of the drive period indicative of the extent of ageing and which is arranged to adjust the voltage stored on the storage capacitance accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.