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°. The fabricated MLA diffuser may greatly enhance the color-mixing characteristics of LED backlight systems and help reduce the number of LEDs required.
© 2006 Optical Society of America
Original Manuscript: May 17, 2006
Revised Manuscript: July 16, 2006
Manuscript Accepted: July 20, 2006
Published: September 25, 2006
Sung-Il Chang, Jun-Bo Yoon, Hongki Kim, Jin-Jong Kim, Baik-Kyu Lee, and Dong Ho Shin, "Microlens array diffuser for a light-emitting diode backlight system," Opt. Lett. 31, 3016-3018 (2006)