Abstract
In our previous work, IEEE/OSA Journal of Display Technology, February 2012, we
examined the luminance and uniformity characteristics of a newly invented secondary
optical lens with a wide emission angle called a “lightguide–diffusive component”. The
lightguide-diffusive component is designed for thin direct LED backlighting
applications. The LED backlight module is composed of at least an LED light source, a
secondary lightguide–diffusive component with a micro-structure reflective bottom
surface, and a flexible printed circuit (FPC) for LED lighting without a
brightness-enhanced film (BEF). Through this lightguide–diffusive component, the
emission profile of a single LED is modified to provide better illumination and more
uniformity. In this work, the micro-structure reflective bottom is redesigned to be
shaped like a Tetrahedron Reflector Structure Array instead of a triangle cylinder
structured array, resulting in a more uniform spatial light energy distribution on the
emission plane of the LED backlight. The simulation results show an increase in the
uniformity ratio with the new design from 72% to 76%, a 4% improvement, the angle of the
luminous intensity is increased from 98 deg to 112 deg, a 14 deg improvement, a decrease
in the luminance is from 9024 nits to 8551 nits, an impairment of 5%, and a decrease in
the volume of the micro-structure reflector from 1.154 mm<sup>3</sup> to 0.767 mm<sup>3</sup>, a
33.5% volume reduction (cost saving).
© 2012 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription