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http://dx.doi.org/10.3807/JOSK.2013.17.6.506

Analysis of Color Uniformity of White LED Lens Packages for Direct-lit LCD Backlight Applications  

Joo, Byung-Yun (Department of Mechanical Engineering, Korea University of Technology and Education)
Ko, Jae-Hyeon (Department of Physics, Hallym University)
Publication Information
Journal of the Optical Society of Korea / v.17, no.6, 2013 , pp. 506-512 More about this Journal
Abstract
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.
Keywords
LED; Backlight; Color separation; Optical simulation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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