Active matrix display devices
US7839367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2005 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Jan 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/148
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active matrix EL display device has pixels comprising an EL display element, a drive transistor and a storage capacitor for storing a voltage to be used for controlling the addressing of the drive transistor. Each pixel also has a light-dependent device for controlling discharge of the storage capacitor, thereby to alter the control of the drive transistor in dependence on the light output of the display element. A circuit is associated with the drive transistor for increasing the rate of discharge of the storage capacitor when the storage capacitor is discharged in response to the light dependent device output. This improvement in the rate of capacitor discharge ensures that good correction for differential aging is obtained at all grey levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.