Factor Effect Study for the High Cyclic Bending Fatigue of Thin Films on PET Substrate for Flexible Displays Applications

Flexible displays is an emerging technology in which devices are mounted on flexible substrates, generally plastic substrates rather than glass ones. Flexible displays have a compliant structure, very-thin profile, low weight, and ultimately low cost. However, although this technology shows a great...

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Bibliographic Details
Published in:Journal of display technology 2011-06, Vol.7 (6), p.348-355
Main Authors: Alzoubi, K, Lu, S, Sammakia, B, Poliks, M
Format: Article
Language:English
Subjects:
Bending
Bending fatigue
Copper
Design of experiments
Design of experiments (DOE)
Devices
Displays
Fatigue
Fatigue failure
flexible displays
flexible substrates
high cyclic bending fatigue
Humidity
Polyethylene terephthalates
Positron emission tomography
Resistance
Stresses
Studies
Substrates
Temperature
Thin films
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Summary:Flexible displays is an emerging technology in which devices are mounted on flexible substrates, generally plastic substrates rather than glass ones. Flexible displays have a compliant structure, very-thin profile, low weight, and ultimately low cost. However, although this technology shows a great promise, it is still nascent and therefore faces many challenges. One of the main challenges that results in performance degradation is sensitivity to ambient conditions. Flexible displays are susceptible to many types of stresses during processing and usage including mechanical, thermal, and chemical stresses. Tension, compression, and bending are examples of mechanical stresses that might cause failures when applied repeatedly during processing. In this work, design of experiments (DOE) methods were used to study the factors affecting the high cyclic bending fatigue of uniform copper thin films forming the back planes of flexible displays on polyethylene terephthalate (PET) substrates. A 2 k-1 fractional factorial design was implemented to investigate the significant parameter effect. The parameters investigated were temperature, humidity, bending radius, film thickness, and frequency. Initial results showed a great effect of temperature and bending radius on the bending fatigue life of such structures.
ISSN:1551-319X
1558-9323
DOI:10.1109/JDT.2010.2076772