Efficient and cost-effective polarized-light backlights for LCDs

Hugo J. Cornelissen; Henri J. B. Jagt; Dirk J. Broer; Cees W. M. Bastiaansen

doi:10.1117/12.801323

2 September 2008 Efficient and cost-effective polarized-light backlights for LCDs

Hugo J. Cornelissen, Henri J. B. Jagt, Dirk J. Broer, Cees W. M. Bastiaansen

Proceedings Volume 7058, Eighth International Conference on Solid State Lighting; 70580X (2008) https://doi.org/10.1117/12.801323
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

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.

Citation Download Citation

Hugo J. Cornelissen, Henri J. B. Jagt, Dirk J. Broer, and 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); https://doi.org/10.1117/12.801323

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