Electroluminescent display compensated analog transistor drive signal
US8026873B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2007 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Dec 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for providing an analog drive transistor control signal to the gate electrode of a drive transistor in a drive circuit that applies current to an EL device, the drive circuit including a first supply electrode of the drive transistor and the EL device connected to a second supply electrode of the drive transistor, comprising a measuring circuit for measuring the current passing through the supply electrodes at different times to provide an aging signal representing variations in the characteristics of the drive transistor and EL device caused by operation of the drive transistor and EL device over time; a compensator for changing a linear code value in response to the aging signal to compensate for the variations in the characteristics of the drive transistor and EL device; and a linear source driver for producing the analog drive transistor control signal in response to the changed linear code value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.