Linearly polarized light‐emitting backlight
Authors:
- H. J. B. JagtHJH. J. B. Jagt
- H. J. CornelissenHCH. J. Cornelissen
- D. J. BroerDBD. J. Broer
- C. W. M. BastiaansenCBC. W. M. Bastiaansen
- 1 March 2002
- journal article
- Published by Wiley in Journal of the Society for Information Display
- Vol. 10 (1) , 107-112
Abstract
—: A new polarized backlight system for liquid‐crystal displays (LCDs) is presented in which one linear polarization is preferentially coupled out by anisotropic scattering. The lightguide consists of a polymeric polarization‐dependent scattering film adhered to a transparent polymeric substrate. By changing the scattering power of the film, the polarized light outcoupling angles can be influenced and optimized to achieve a maximum outcoupling centered along the normal direction. The other linear polarization is mainly trapped in the lightguide and is shown to be recycled to enhance the overall light and/or energy efficiency. With a proper substrate choice, the achieved local contrast exceeds 14 over a 50‐mm range. A collimated light input further enhances the polarized contrast to well over 17.Keywords
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