Microlens array diffuser for a light-emitting diode backlight system |
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| Authors: | Chang Sung-Il Yoon Jun-Bo Kim Hongki Kim Jin-Jong Lee Baik-Kyu Shin Dong Ho |
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| Affiliation: | Department of electrical Engineering and computer Science, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon, Korea. sichang@3dmems.kaist.ac.kr |
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| Abstract: | Microlens array (MLA) diffusers for light-emitting diode (LED) backlight systems have been developed. A high fill-factor photoresist mold for the MLA was fabricated using three-dimensional diffuser lithography, and the patterns were transferred to a nickel master mold for UV-curable polymer replication. The fabricated microlens had various paraboloidal profiles, and its aspect ratio was controlled from 1.0 to 2.1. The MLA diffuser showed a batwing radiation pattern with a radiation angle of 150 degrees. The fabricated MLA diffuser may greatly enhance the color-mixing characteristics of LED backlight systems and help reduce the number of LEDs required. |
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