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Mechanical Performance of Thin Films in Flexible Displays

Published online by Cambridge University Press:  17 March 2011

Jay Lewis ,
Sonia Grego ,
Erik Vick ,
Babu Chalamala  and
Dorota Temple
Jay Lewis
Affiliation:
MCNC Research & Development Institute Research Triangle Park, NC 27709, U.S.A.
Sonia Grego
Affiliation:
MCNC Research & Development Institute Research Triangle Park, NC 27709, U.S.A.
Erik Vick
Affiliation:
MCNC Research & Development Institute Research Triangle Park, NC 27709, U.S.A.
Babu Chalamala
Affiliation:
MCNC Research & Development Institute Research Triangle Park, NC 27709, U.S.A.
Dorota Temple
Affiliation:
MCNC Research & Development Institute Research Triangle Park, NC 27709, U.S.A.
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Abstract

The use of brittle materials in flexible displays requires the understanding of the mechanical limitations of the materials and the various display architectures. We discuss various approaches to mechanical bend tests for components of flexible displays and describe a new test method based on a three-axis motion. We discuss the mechanical limitations of indium tin oxide (ITO) as a transparent conductor, and present results for a more mechanically robust multilayer transparent conductor made of an ITO-metal-ITO (IMI) stack. The IMI structures showed dramatically improved mechanical properties when subjected to bending both as a function of radius of curvature as well as number of cycles to a fixed radius. Organic light emitting devices fabricated on IMI anodes showed improved performance compared with those made on ITO anodes at current densities greater than 1 mA/cm2 due to the improved conductivity of the anode. We discuss the difficulties in analysis of the mechanical failure of transparent thin film permeation barriers. We present a novel approach for etching barrier-coated polymer substrates such that film cracking is readily visible. We report on the bend test results for sputter- deposited SiOxNy films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 814: Symposium I – Flexible Electronics 2004-Materials and Device Technology , 2004 , I8.5
Copyright
Copyright © Materials Research Society 2004

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