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Proceedings Paper

Efficient and cost-effective polarized-light backlights for LCDs
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Paper 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.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580X (2 September 2008); doi: 10.1117/12.801323
Show Author Affiliations
Hugo J. Cornelissen, Philips Research (Netherlands)
Henri J. B. Jagt, Philips Research (Netherlands)
Dirk J. Broer, Philips Research (Netherlands)
Univ. of Technology Eindhoven (Netherlands)
Cees W. M. Bastiaansen, Univ. of Technology Eindhoven (Netherlands)


Published in SPIE Proceedings Vol. 7058:
Eighth International Conference on Solid State Lighting
Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park, Editor(s)

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