LED Backlight Module by a Lightguide-Diffusive Component With Tetrahedron Reflector Array
| Autor: | Rong-Seng Chang, Thomas C. Chuang, Jang-Zern Tsai, Tung-Yen Li |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Brightness
Materials science business.industry Luminous intensity Backlight Condensed Matter Physics Luminance Flexible electronics Electronic Optical and Magnetic Materials law.invention LED lamp Printed circuit board Optics law Flexible display Optoelectronics Electrical and Electronic Engineering business |
| Zdroj: | Journal of Display Technology. 8:321-328 |
| ISSN: | 1558-9323 1551-319X |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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