Abstract
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<i><sup>k-1</sup></i>
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.
© 2010 IEEE
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