Title

Polarization-Preserving Light Guide Plate For A Linearly Polarized Backlight

Keywords

Light guide plate; liquid crystal display (LCD)

Abstract

We analyze the polarization-preserving property of two conventional edge-lit light guide plates (LGPs) based on scattering dots and refractive microgrooves and find that these two structures almost completely depolarize the incident linearly polarized light. We then propose a new edge-lit LGP based on total internal reflection (TIR). Simulation results show that such a TIR-based LGP can largely preserve the polarization state of the incident linearly polarized light. The polarization efficiency is 77.2%. By incorporating a linearly polarized LED to our proposed LGP, the overall optical gain is 1.54 compared with the backlight system with an unpolarized LED. At on-axis, the luminance is 2.4 × higher. Because the output light is concentrated near the surface normal direction, no additional brightness enhancement film is needed. This polarization-preserving LGP enables a polarized or partially polarized LED backlight to be used, which in turn greatly enhances the optical efficiency of a LCD. © 2005-2012 IEEE.

Publication Date

3-1-2014

Publication Title

IEEE/OSA Journal of Display Technology

Volume

10

Issue

3

Number of Pages

208-214

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/JDT.2013.2294645

Socpus ID

84896876778 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84896876778

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