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A high-sag microlens array film with a full fill factor and its application to organic light emitting diodes

Hyouk Kwon1, Youngjoo Yee1, Chi-Hwan Jeong1, Hyo-Jin Nam1 and Jong-Uk Bu2

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This paper reports a novel high-sag microlens array (MLA) film with a full fill factor and presents its application to organic light emitting diodes (OLEDs) for the purpose of improving their outcoupling efficiency. A gapless hexagonal MLA film having a high sag ratio is proposed and fabricated by a simple micromachining process including trench formation and the conformal vapor phase deposition of a polymer. By applying the MLA films to OLED panels, the outcoupling efficiency was increased by a maximum of 48% without any apparent color shift. A high-sag MLA film with a full fill factor is expected to impart remarkable optical efficiency to various display or lighting applications with flat panel light sources including OLEDs.


PACS

85.60.Jb Light-emitting devices

42.79.Bh Lenses, prisms and mirrors

81.20.Wk Machining, milling

Subjects

Electronics and devices

Optics, quantum optics and lasers

Condensed matter: structural, mechanical & thermal

Dates

Issue 6 (June 2008)

Received 22 January 2008, in final form 20 March 2008

Published 25 April 2008



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