Electroluminescent display devices
US8310413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2005 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Oct 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2102/3026
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active matrix display device comprises an array of display pixels, with each pixel comprising an EL display element, a light-dependent device for detecting the brightness of the display element and a drive transistor circuit for driving a current through the display element. The drive transistor is controlled in response to the light-dependent device output so that ageing compensation can be implemented. The light-dependent device is located laterally of the area of light emitting material of the EL display element. In this way, the light-dependent device does not cause step coverage problems and can be integrated into the pixel layout without affecting the pixel aperture. Furthermore, the light dependent device can extend alongside the full length of the area of light emitting material so that it receives light input from a large part of the display element area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.