title: Microlens array diffuser for a light-emitting diode backlight system.
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.
authors.affiliation: Department of electrical Engineering and computer Science, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon, Korea. sichang@3dmems.kaist.ac.kr
authors.forename: Sung-Il
authors.initials: SI
authors.lastname: Chang
authors.forename: Jun-Bo
authors.initials: JB
authors.lastname: Yoon
authors.forename: Hongki
authors.initials: H
authors.lastname: Kim
authors.forename: Jin-Jong
authors.initials: JJ
authors.lastname: Kim
authors.forename: Baik-Kyu
authors.initials: BK
authors.lastname: Lee
authors.forename: Dong Ho
authors.initials: DH
authors.lastname: Shin