Abstract
We define a metric of useful operating lifetime of an
organic light-emitting device (OLED) display and relate it to the commonly
measured half-life of constituent OLED pixels. We enumerate sources of OLED
operational instability and propose an optical feedback solution in a novel
integrated configuration to counter pixel aging and maintain stable light
output across all of the pixels of an OLED display. Such optical feedback
can correct pixel imperfections in both active matrix and passive matrix OLED
displays. As an example, we analyze lifetime data previously published by
Kwong . in 2002, and demonstrate that our optical feedback technique
could maintain 100 cd/m$^{2}$ display
light output within a 2% brightness accuracy for more than 25 000 hours of
continuous use for this specific OLED system. From this example we draw conclusions
generally applicable to extending stable operating lifetime of other OLED
structures.
© 2008 IEEE
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