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http://dx.doi.org/10.7317/pk.2012.36.6.761

Improvement of Optical and Thermo-mechanical Properties of Polycarbonate-based Diffusers for LED Backlight Unit by Incorporation of Porous Silica Particles  

Kim, Hyo Jin (Department of Advanced Materials Engineering, Kyonggi University)
Kim, Dong Won (Department of Advanced Materials Engineering, Kyonggi University)
Kim, Seong Woo (Department of Chemical Engineering, Kyonggi university)
Publication Information
Polymer(Korea) / v.36, no.6, 2012 , pp. 761-767 More about this Journal
Abstract
The polycarbonate (PC)-based optical diffusers for direct-lit LED backlight unit were prepared by using extrusion compounding followed by compression molding process. The application of inorganic porous silica particles as a diffusing agent in addition to conventional poly(methyl methacrylate) (PMMA) beads was attempted, and the optical, thermal, and mechanical properties of the prepared diffusers were investigated. The morphological observations revealed that the diffusing agents could be uniformly dispersed in the PC matrix without agglomeration by high shear stress generated during extrusion process. The incorporation of the porous silica particles mixed with PMMA beads remarkably enhanced the luminance uniformity with respect to both location and view angle for the diffuser, while minimizing the reduction in the absolute luminance, as compared with the diffuser containing only PMMA beads. In addition, thermal and mechanical properties of the diffusers were shown to be improved upon addition of the porous silica particles.
Keywords
LED backlight unit; extrusion compounding; porous silica; luminance uniformity;
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