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http://dx.doi.org/10.3807/KJOP.2005.16.2.113

Micro-patterning of light guide panel in a LCD-BLU by using on silicon crystals  

lChoi Kau (Micro Optics Research Laboratory, Department of Physics, Hanyang University)
Lee, Joon-Seob (Micro Optics Research Laboratory, Department of Physics, Hanyang University)
Song, Seok-Ho (Micro Optics Research Laboratory, Department of Physics, Hanyang University)
Oh Cha-Hwan (Micro Optics Research Laboratory, Department of Physics, Hanyang University)
Kim, Pill-Soo (Micro Optics Research Laboratory, Department of Physics, Hanyang University)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.2, 2005 , pp. 113-120 More about this Journal
Abstract
Luminous efficiency and uniformity in a LCD-BLU are mainly determined by fine scattering patterns formed on the light guide panel. We propose a novel fabrication method of 3-dimensional scattered patterns based on anisotropic etching of silicon wafers. Micro-pyramid patterns with 70.5 degree apex-angle and micro-prism patterns with 109.4 degree apex-angle can be self-constructed by the wet, anisotropic etching of (100) and (110) silicon wafers, respectively, and those patterns are easily duplicated by the PDMS replica process. Experimental results on spatial and angular distributions of irradiation from the light guide panel with the micro-pyramid patterns were very consistent with the calculation results. Surface roughness of the silicon-based micro-patterns is free from any artificial defects since the micro-patterns are inherently formed with silicon crystal surfaces. Therefore, we expect that the silicon based micro-patterning process makes it possible to fabricate perfect 3-dimensional micro-structures with crystal surface and apex angles, which may guarantee mass-reproduction of the light guide panels in LCD-BLU.
Keywords
liquid crystal display; backlight unit; light guide plate;
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