Organic electroluminescent devices and method for improving energy efficiency and optical stability thereof
US6727660B1 · kind B1 · utility
4Cited by
11References
21Claims
0Family size
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Inventor
Key dates
| Filing date | Mar 27, 2003 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Mar 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An organic electroluminescent device (“OELD”) has a controllable brightness, an improved energy efficiency, and stable optical output at low brightness. The OELD is activated with a series of voltage pulses, each of which has a maximum voltage value that corresponds to the maximum power efficiency when the OELD is activated. The frequency of the pulses, or the duty cycle, or both are chosen to provide the desired average brightness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.