Abstract
This paper proposes an approach for optimizing an optical collimation film
with duplex microstructures to access the more collimated light. In the
optimization, the lenticular lens on the upper surface of the optical film
was replaced with an elliptical cylindrical lens that can eliminate
spherical aberration and induce the light emerging from its focus to become
a completely collimated beam. Moreover, the microstructure on the lower
surface of the optical film was replaced by a multisloped asymmetric
microstructure to induce the incident light to concentrate on the region
closer to the focus of the upper elliptical cylindrical lens and to be
reflected by total internal reflection; then the reflected light became a
more collimated beam through the upper elliptical cylindrical lens. All of
the related parameters were optimized and determined by performing
simulations in a series of optimization processes. In addition, the
optimization was implemented for two types of reflector: white and specular
reflectors. Compared with the collimation film without being optimized, the
light emerging from the optimized collimation film is more collimated and
exhibits a higher intensity peak. The full widths at half maximum of the
transverse angular distribution of the emerging light for the both
conditions with the white and specular reflectors are further reduced by 25%
and 38%, respectively, and the intensity peaks increase by 32% and 50.2%,
respectively. Compared with the general inverted-prism film, the intensity
peaks of the optimized collimation film for the both conditions considerably
increase by 99.1% and 139.7%, respectively. Furthermore, the optimized
collimation film has an optimal optical efficiency that is greater than
90%.
© 2015 IEEE
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