Abstract
The Taguchi method is applied to optimize the design
of a micro-prism diffusion film in such a way as to maximize
the luminance uniformity of a slim-type bottom-lit backlight
unit illuminated by cold cathode fluorescent lamp (CCFL) light
sources. The effects on the luminance uniformity of the filling
density, apex angle and aspect ratio of the prism structures and
the placement angle of the diffusion film are systematically examined
using a three-level Taguchi L27(3<sup>13</sup>) orthogonal array.
The signal-to-noise (S/N) ratio and analysis of variance (ANOVA)
results show that the interaction between the filling density, apex
angle and aspect ratio have a significant impact on the luminance
uniformity. It is shown that the optimal design parameter settings
are a filling density of 100%, an apex angle of 100°, an aspect ratio
of 5:1 and a optical film placement angle of 20°. The optimized
micro-prism optical film design not only results in a luminance
uniformity of 97.8%, but also enables a significant reduction in
the thickness of the bottom-lit backlight unit.
© 2011 IEEE
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