Digital-drive electroluminescent display with aging compensation
US8130182B2 · kind B2 · utility
9Cited by
7References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 18, 2008 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | Oct 1, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electroluminescent (EL) subpixel driven by a digital-drive scheme has a readout transistor driven by a current source when the drive transistor is non-conducting. This produces an emitter-voltage signal from which an aging signal representing the efficiency of the EL emitter can be computed. The aging signal is used to determine the loss in current of the subpixel when active, and an input signal is adjusted to provide increased on-time to compensate for voltage rise and efficiency loss of the EL emitter. Variations due to temperature can also be compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.