Analysis of the far-field region of LEDs

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28037

Title:	Analysis of the far-field region of LEDs
Authors:	Sun,CC;Chien,WT;Moreno,I;Hsieh,CC;Lo,YC
Contributors:	光電科學研究所
Keywords:	LIGHT-EMITTING-DIODES;UNIFORM ILLUMINATION;WHITE LEDS;EFFICIENCY;ARRAYS;DESIGN;MODEL;LENS
Date:	2009
Issue Date:	2010-06-29 19:40:43 (UTC+8)
Publisher:	中央大學
Abstract:	Versatility in the design of optical systems is one of the key features of light-emitting diodes (LEDs) that has attracted considerable attention. In the analysis of systems using LEDs, it is useful to know if the distance is far enough from the LED to allow the radiation pattern to be simulated by the point source approach. We propose three far-zone conditions for LED light modeling: the far-field distance, and for practical purposes the quasi far-field and minimum far-field distances. Different types of LEDs have different far-field ranges. We analyze these differences by modulating key parameters like geometrical structure of encapsulating lens, chip size, chip shape, chip position, and package errors. We find that far-field region considerably depends more on the shape of both lens and chip than all other parameters. (C) 2009 Optical Society of America
Relation:	OPTICS EXPRESS
Appears in Collections:	[Graduate Institute of Optics and Photonics] journal & Dissertation

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