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Proceedings Paper

Analysis of die-imaging and yellow hue phenomena in LED TIR lens
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Paper Abstract

For a wide application area, LEDs are always with secondary optic elements for a specific characteristic. However, the secondary optic element has two serious phenomena, die-imaging and yellow hue. In this literature, we study the two phenomena in two parts. The first part focuses on the relationship between the die-imaging phenomenon and the imaging power of TIR lens. In this part, we design two TIR lenses, point-to-point and point-to-plane, with difference imaging power and analysis the ray paths. The second part focuses on the simulation of white LED with the two different TIR lenses to study yellow hue phenomenon. Based on the color difference in CIE (u', v') picture, we get the relationship between refractive power and color shift. Finally, we adopt the MacAdam ellipsis system to define the reasonable color gamut.

Paper Details

Date Published: 2 September 2008
PDF: 11 pages
Proc. SPIE 7059, Nonimaging Optics and Efficient Illumination Systems V, 70590O (2 September 2008); doi: 10.1117/12.792530
Show Author Affiliations
Yi-Yung Chen, NTUST (Taiwan)
I-Ju Chen, NTUST (Taiwan)
Allen Jong-Woei Whang, NTUST (Taiwan)
Liang-Tang Chen, NTUST (Taiwan)


Published in SPIE Proceedings Vol. 7059:
Nonimaging Optics and Efficient Illumination Systems V
Roland Winston; R. John Koshel, Editor(s)

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