Next Article in Journal
Threefold Spiral Structure Constructed by 1D Chains of [[M(NCS)2(bpa)2]·biphenyl]n (M = Fe, Co; bpa = 1,2-bis(4-pyridyl)ethane)
Next Article in Special Issue
Application of Dimming Compensation Technology Via Liquid Crystal Lens for Non-Imaging Projection Laser Systems
Previous Article in Journal
Recent Advances on Carrier and Exciton Self-Trapping in Strontium Titanate: Understanding the Luminescence Emissions
Previous Article in Special Issue
Emerging Perovskite Nanocrystals-Enhanced Solid-State Lighting and Liquid-Crystal Displays
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Crystals 2019, 9(2), 96; https://doi.org/10.3390/cryst9020096

Construction and Optimization of Through-Hole LED Models for Use in Designing Traffic Signboards

1
College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
2
Department of Optics and Photonics, National Central University, Taoyuan City 32001, Taiwan
*
Author to whom correspondence should be addressed.
Received: 30 November 2018 / Revised: 2 February 2019 / Accepted: 12 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Advanced LED Solid-state Lighting Optics)
Full-Text   |   PDF [6944 KB, uploaded 14 February 2019]   |  

Abstract

A modeling procedure was proposed for the through-hole LEDs commonly used in traffic signs. The measurements from a sample batch of LEDs were performed at several midfield distances to provide a set of representative angular intensity distributions as the target pattern in the modeling process. The flat outer dimensions of the LED were accurately measured while the curvature and refractive index of the packaging dome were roughly estimated. These physical parameters were used to build a preliminary LED model in the Monte Carlo simulation software. The simulated angular intensity distribution at each distance was generated by tracing 20,000,000 rays. The normalized cross correlation (NCC) between the measured and simulated data was calculated to represent the resemblance of the model to the real LED. The roughly estimated parameters were then varied within their physical limits to optimize the NCC value. The possibilities of two parameters having interactions were also considered. The final model has all NCCs above 98.8% between the target and simulated patterns. View Full-Text
Keywords: LED; modeling; midfield; simulation; optimization; dome packaging LED; modeling; midfield; simulation; optimization; dome packaging
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Lee, T. .-T.; Chen, Y.-C. Construction and Optimization of Through-Hole LED Models for Use in Designing Traffic Signboards. Crystals 2019, 9, 96.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Crystals EISSN 2073-4352 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top