A PMMA composite as an optical diffuser in a liquid crystal display backlighting unit (BLU) |
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Authors: | GeunHyung Kim |
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Institution: | a R&D Center of LCD Business, Optical and Mechanical development team, Samsung Electronics Co., Ltd., San 24 Nongseo-Ri, Giheung-Eup, Yongin-City, Gyeonggi-Do 449-900, Korea b Department of Future Technology, Korea Institute of Machinery & Materials, 171 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea |
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Abstract: | The effect of thermo-physical properties, relative humidity and stiffness on the warpage of a poly(methyl methacrylate) (PMMA) diffusing plate modified with glass fibers in a direct-lit backlight unit (BLU) of a liquid crystal display (LCD) was investigated. The warpage of the PMMA diffusing composites modified with a glass fiber were significantly reduced relative to that of a conventional PMMA diffusing plate. Luminance and scattering characteristics of the PMMA diffusing composites having 5, 10, 20 vol% of glass fibers were measured. Although the luminance of the composite was lowered as increasing the volume fractions of glass fibers in the PMMA composites, good brightness uniformity of the composites on a light source was obtained. |
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Keywords: | Poly(methyl methacrylate) Polymeric composites Warpage Optical diffuser Thermo-physical properties |
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