The fabrication of microlens array with different focal length and the application in solid state lighting
Date Issued
2012
Date
2012
Author(s)
Feng, Sheng-Yuna
Abstract
Microlens arrays are applied to several areas, such as imaging reconstruction and organic light emitting diode light extraction. Researchers have studied on how to increase the efficiency of luminous current and luminous power of an organic light-emitting device (OLED) [1] by using several spheres with different diameters.
In this thesis, a method to fabricate a micro lens array with different diameters is presented. By using negative PR (photoresist) as a boundary confinement, we can make microlens array with different diameters on a single thermal reflowing process. Unlike traditional method, this method does not suffer tight thermal dose control because the PR reflowing can be confined effectively by pre-patterned negative PR boundaries.
At last, we will try to make concave microlens array transformed from freeform lens. And compare the illumination map measured from the microlens array transformed from freeform lens with the result of demonstration run by simulation
Subjects
microlens array with different focal length
focal length control
boundary confiner
different photoresist
Type
thesis
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