Overview
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Read the articleAUTHORS
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Christophe FÉRY: Thomson R&D France
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Philippe LE ROY: Thomson R&D France
INTRODUCTION
The first results in organic electroluminescence (EL) date back to the 1960s, with the study of anthracene molecules by Pope et al.
The reasons for using organic EL for visualization applications are as follows:
good luminous efficiency (∼ 1 lm/W for white display with high potential for improvement);
low control voltage (V threshold < 3 V, operation < 10 V);
very low response time (well suited to video display) ;
emissive technology: power consumption depends on image content;
grand angle de vue (lambertian show) ;
low thickness (determined by the thickness of the substrate and the encapsulation method) and the possibility of using flexible substrates;
potentially low-cost (devices based on simple thin films, low-temperature manufacturing process compatible with large surfaces, elimination of color filters and LCD lightboxes, etc.).
However, there are still a number of technological hurdles that need to be overcome to benefit from these advantages. These include
lifetime (currently < 10,000 hours) and sensitivity to humidity, oxygen and temperature (need to encapsulate with a glass or metal cover and use/storage below 60 ˚C) ;
Differential ageing of red, green and blue pixels depending on their use: strong marking likely and color degradation ;
development of active-matrix addressing (development of suitable, low-cost poly-Si transistor arrays);
development of adapted industrial production tools.
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Display. Visualization
Bibliography
References
Theses
- SHENG-HSIUNG (Y.) - Synthèse et caractérisation des dérivés de poly(2,3-diphényl-1,4-phénylène vinylène) et des composites poly (1, 4-phénylène vinylène)/nanoparticules d'oxyde : propriétés optiques et électriques des diodes utilisant des films composites comme couches actives. - Université de Nantes (2004).
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Manufacturers
Toshiba Matsushita Display Technology
http://www.tmdisplay.com/tm_dsp/index.htm
Kodak
http://www.kodak.com/go/display
Cambridge Display Technology (PLED)
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