Abstract
This paper utilizes the Taguchi design method to optimize the design
parameters of a light-emitting diode (LED) backlight unit for wide color
gamut liquid crystal displays (LCDs). In optimizing the design, the
parametric analyses consider two particular regions of the backlight unit,
namely, the color-mixing zone and the extractor zone. The Taguchi
experiments are configured in ${\rm L} _{9} (3 ^{4} )$ orthogonal arrays and are designed to evaluate the effects of the
design parameters on the color-difference, optical efficiency and luminance
of the unit. The analysis of variance (ANOVA) results reveal that the
optical efficiency and color-difference properties are determined primarily
by the reflector design and the length of the color mixing zone,
respectively, while the luminance to the LCD panel is affected principally
by the taper angle of the optical microstructures in the extractor zone. The
optimal design parameters of the color-mixing zone and extractor zone are
estimated from the Taguchi ${\rm S}/{\rm N}$ ratio data and the ANOVA results, and are verified via
ray-tracing simulations. For an input flux of 1501 lm, the optimal design
shows 0.01 of the color differences in CIE 1976 color space, 85% of the
optical efficiency, and 10675 nits of luminance. Thus, the optimized
backlight unit provides an ideal solution for the illumination of
large-scale LCD display devices.
© 2009 IEEE
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