Recently, the color separation issue of wide-spreading white LEDs has attracted attention due to their wide applicability as light sources in direct-lit LCD backlights. These wide-spreading LED packages usually consist of LED chips, a color-conversion phosphor layer, and a light-shaping lens. The technical aspect of this color issue was related to a method for balancing the yellow spectral component emitting from phosphors with respect to the blue one from the LED chip as a function of viewing angle. In this study, we suggested an approach for carrying out quantitative analysis for the color separation problem occurring in wide-spreading LED packages by optical simulation. In addition, the effect of an internal scattering layer on the color uniformity was investigated, which may be considered as a potential solution for this problem.
© 2013 Optical Society of Korea
Original Manuscript: August 19, 2013
Revised Manuscript: October 14, 2013
Manuscript Accepted: October 14, 2013
Published: December 25, 2013
Byung-Yun Joo and Jae-Hyeon Ko, "Analysis of Color Uniformity of White LED Lens Packages for Direct-lit LCD Backlight Applications," J. Opt. Soc. Korea 17, 506-512 (2013)
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