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 mm³ to 0.767 mm³, a 33.5% volume reduction (cost saving).

© 2012 IEEE

Design of a brightness-enhancement-film-adaptive freeform lens to enhance overall performance in direct-lit light-emitting diode backlighting

Bin Xie, Run Hu, Qi Chen, Xingjian Yu, Dan Wu, Kai Wang, and Xiaobing Luo
Appl. Opt. 54(17) 5542-5548 (2015)

High luminance hybrid light guide plate for backlight module application

Jui-Wen Pan and Chen-Wei Fan
Opt. Express 19(21) 20079-20087 (2011)

Dual-view angle backlight module design

Bo-Tsuen Chen and Jui-Wen Pan
Appl. Opt. 54(28) E80-E87 (2015)

Zero-optical-distance mini-LED backlight with light-guiding microstructure lens for extra-thin, large-area notebook LCDs

Zhi Ting Ye, Yen Lung Chen, Chang Che Chiu, and Chia Chun Hu
Opt. Express 31(26) 43600-43614 (2023)

Switchable viewing angle display with a compact directional backlight and striped diffuser

Yi-Jun Wang, Jian-Gang Lu, Wei-Chung Chao, and Han-Ping D. Shieh
Opt. Express 23(16) 21443-21454 (2015)