An efficient illumination system for liquid crystal displays incorporating an anisotropic hologram

C. Sánchez, M. J. Escuti, C. Van Heesch, C.W.M. Bastiaansen, D. J. Broer

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

An anisotropic hologram is combined with an edge-lit planar waveguide to produce an improved liquid crystal display (LCD) backlight. A holographic-polymer dispersed liquid crystal material is exposed to a slanted one-dimensional interference pattern to produce an anisotropic Bragg transmission grating with strong diffraction for P-polarized light and very low diffraction for S-polarized light. While the hologram is recorded at a UV wavelength (351 nm), light at visible wavelengths propagating from the waveguide edge is redirected toward the normal direction. The emission is collimated, polarized, and unidirectional, effectively integrating several functions that are typically embodied in separate optical films in a conventional LCD.

Original languageEnglish
Article number094101
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number9
DOIs
Publication statusPublished - 29 Aug 2005

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