Abstract
Light out-coupling efficiency is a common issue for
light emissive displays and devices, but is rarely
discussed for reflective displays (e-Paper). The latest
generation of reflective displays include light
scattering particles and reflectance that is close to
Lambertian (paper-like). However, this light scattering
inside a reflective pixel can lead to total-internal
reflection and additional light loss. This paper
provides both a simple geometrical and a more detailed
MATLAB simulation for calculating light out-coupling.
Both approaches were found to agree with experimental
results that reveal 5%–20% optical loss due to
inefficient out-coupling. These out-coupling models
improve the accuracy of predicting optical performance
in reflective displays.
© 2011 IEEE
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