Abstract
A new light guide plate (LGP) with highly directional emission properties
based on V-groove cells has been investigated. To achieve high uniformity
at normal luminance distributions for LCD backlight units (BLUs), we present
a cell composed of multiple V-groove
microstructures, and demonstrate its performance in a 10.1-inch BLU. We have
found the density of the V-grooves to affect luminance distribution, and the
directionality of emissions increases with number of V-groove microstructures
in a cell. A cell composed of five V-groove microstructures delivered a 1.9-fold
increase in optical efficiency when compared with a conventional BLU: the
central luminance was 2.3 times greater, the main viewing angle was at
$-{{1}}^{\circ}$
,
and distribution of viewing luminance was almost symmetrical. In conclusion,
our V-groove cell LGP for BLUs is thin and simple, providing high efficiency
and high uniformity at normal luminance distributions.
© 2014 IEEE
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