2 September 2008 Efficient and cost-effective polarized-light backlights for LCDs
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To improve the optical efficiency and to reduce the number of optical components of LCD backlighting systems, two types of polarized-light backlights have been made from micro-structured birefringent polymeric layers. One type uses uniaxially oriented PEN and PET foils that have been structured by diamond-tool machining or by hot-embossing, and subsequently laminated onto a flat PMMA light guide. The second type uses a liquid crystalline polymeric layer laminated onto a micro-structured light guide. S-polarized light is preferentially extracted from the light guides. The efficiency has been measured to be 1.6-1.7 times higher than for a conventional backlight. Costs, thickness and complexity are decreased since no micro-prismatic brightness enhancement foils or reflective polarizer foils are needed.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hugo J. Cornelissen, Hugo J. Cornelissen, Henri J. B. Jagt, Henri J. B. Jagt, Dirk J. Broer, Dirk J. Broer, Cees W. M. Bastiaansen, Cees W. M. Bastiaansen, "Efficient and cost-effective polarized-light backlights for LCDs", Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580X (2 September 2008); doi: 10.1117/12.801323; https://doi.org/10.1117/12.801323

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