System and method for total light extraction from flat-panel light-emitting devices
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United States of America Patent
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May 19, 2009
Grant Date -
Feb 21, 2008
app pub date -
Jun 21, 2007
filing date -
Jun 21, 2006
priority date (Note) -
Expired
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Abstract
A system and method for improving light extraction from luminescent devices such as light-emitting flat-panel displays (for example, light-emitting diode (OLED) flat-panel displays) or flat panel lamps. The system includes a material with negative index of refraction, preferably with n=−1. The presence of such material on the exit surface of the electro-optic devices such as flat panel display or lamp with light-generating medium sandwiched between materials with refractive index n>1 fully removes TIR and results in light outcoupling efficiency of about 100%.
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