Efficient and cost-effective polarized-light backlights for LCDs

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationEighth International Conference on Solid State Lighting
Place of PublicationBellingham
PublisherSPIE
Number of pages10
ISBN (Print)9780819472786
DOIs
Publication statusPublished - 12 Nov 2008
EventThe International Society for Optical Engineering (SPIE) - San Diego, CA, United States
Duration: 11 Aug 200813 Aug 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7058
ISSN (Print)0277-786X

Conference

ConferenceThe International Society for Optical Engineering (SPIE)
CountryUnited States
CitySan Diego, CA
Period11/08/0813/08/08

Keywords

  • Anisotropic
  • Backlight
  • Birefringent
  • LCD
  • Liquid crystalline polymer
  • Micro-structure
  • PEN
  • PET
  • Uniaxial

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