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.

Fabrication of Nanopatterned PDMS Elastic Stamp Mold Using Surface Treatment of Nanotemplate

“…이와 같은 미세구조물을 제작하기 위한 공 정기술로는 대표적으로 광 소스를 이용한 포토리소그래피(photo lithography)공정과 유연기판을 이용한 소프트 리소그래피(soft lithography)공정으로 구분되어 소개되고 있다 [8,9] . [10] .…”

Ionic Liquids in Photopolymerizable Holographic Materials

“…The distribution of diffusing beads in the diffuser is nonuniform, which affects the performance of diffusion light. The surface-relief diffusers scatter the light by the microstructures thereon, e. g. microlens diffuser [67,68], random phase diffuser [69], deterministic diffractive diffuser [70] and holographic diffuser [71][72][73][74][75][76][77]. Much research has been focused on holographic diffusers, which were produced via exposure of the film of photopolymerizable holographic material to collimated light through a diffuser [72], dichromated gelatine [73], photopolymer [74][75][76] and azobenzene polymer [77] have been used to fabricate the diffusers.…”

Sol–Gel Derived Nanocomposites for Optical Applications

“…Particle diffusers rely on transparent beads inside the plastic film to scatter light. [109][110][111] The surface-relief diffusers scatter light by their microstructures, e.g., in microlens, [112,113] random phase, [114] deterministically diffractive, [115] and holographic diffusers. [116] Much research has been performed on holographic diffusers owing to their unique properties, such as controllable diffusion angle, directional property, variability of volume refractive index, and high transmittance.…”