Abstract
An integrated light guide plate (LGP) with a functional structure
for a longer diffusion length to decrease the thickness was proposed
and designed for the large area direct-type LED backlight unit (BLU).
The integrated LGP is composed of a concave cone structure on the top surface and a rugged bottom
surface. The light emitted from the LED sources can be reflected on
the top surface and diffuse effectively inside the LGP and in the
bottom air-gap, which is placed below the LGP to realize sufficient
diffusion length even in the ultra-slim structure. After comparing
the optical simulation results with the measured data from the fabricated
hexagonal unit cell of an LGP, we verified our design concept and
realized the integrated LGP. The final LGP for a 55-inch LED display
shows a brightness uniformity of 90.5% with a reduced number of 81
LEDs and a thickness of 6 mm, a remarkably reduced value compared
with previous direct-type large area LED backlight units.
© 2014 IEEE
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