LED beam shaping lens based on the near-field illumination

Jae Young Joo; Chang Seog Kang; Soon Sub Park; Sun-Kyu Lee

doi:10.1364/OE.17.023449

LED beam shaping lens based on the near-field illumination

Opt Express. 2009 Dec 21;17(26):23449-58. doi: 10.1364/OE.17.023449.

Authors

Jae Young Joo¹, Chang Seog Kang, Soon Sub Park, Sun-Kyu Lee

Affiliation

¹ Department of Mechatronics, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea.

PMID: 20052052
DOI: 10.1364/OE.17.023449

Abstract

This paper presents a novel method in near-field beam shaping based on the precise optical modeling of a gallium nitride light-emitting diode (GaN LED). A Monte Carlo ray tracing simulation has been utilized to calculate the spatial photon distribution near the LED's top. By analyzing the ray data in near-field, the miniaturized lens profile is created and machined with aspherical surfaces and total internal reflection (TIR) Fresnel facets. The prototype lens reduce the viewing angle of the LED from 150 degrees to 17.5 degrees at full width half maximum (FWHM) while increasing the peak luminous intensity 10 times. The array of proposed lens with CSP LEDs exhibits feasibility of ultra thin uniform illumination in near-field.

Publication types

Evaluation Study
Research Support, Non-U.S. Gov't

MeSH terms

Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Lenses*
Lighting / instrumentation*
Pilot Projects
Refractometry / instrumentation*
Semiconductors*