Abstract
This study examines the luminance and uniformity characteristics of a newly
invented secondary optical lens, called the “lightguide-diffusive component,” which has
a wide emission angle and is designed for thin direct LED backlighting applications. The
LED backlight module is composed of, at the very least, a light source, a secondary
lightguide-diffusive component with a newly designed micro-structure having a reflective
bottom surface, and a flexible printed circuit (FPC) for LED lighting. This
lightguide-diffusive component modifies the emission profile of a single LED to provide
better illumination and greater uniformity. The newly designed secondary optical lens
module is shaped to cover the LED array, resulting in a more uniform spatial light
energy distribution on the emission plane of the LED backlight. The uniformity ratio for
the new design shows an increase of 24%, from 60% to 84%, and the luminance a 23.29%
improvement, from 10 000 nits to 12 329 nits.
© 2012 IEEE
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