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Polarized backlight with constrained angular divergence for enhancement of light extraction efficiency from wire grid polarizer.

Authors
  • Yao, Po-Hung
  • Chung, Chi-Jui
  • Wu, Chien-Li
  • Chen, Cheng-Huan
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Feb 27, 2012
Volume
20
Issue
5
Pages
4819–4829
Identifiers
DOI: 10.1364/OE.20.004819
PMID: 22418288
Source
Medline
License
Unknown

Abstract

Efficiency of liquid crystal displays highly depends on the amount of polarized light emerging from the backlight module. In this paper, a backlight architecture using a nanoimprint wire grid polarizer for polarization recycling is proposed and studied, in which the extraction efficiency of polarized light is the major concern. The backlight module is composed of the stack of a wire grid polarizer, a lenticular array and a light guide plate. The light guide plate features interleaving v-groove and trapezoidal ridge coated with aluminum on the top surface, and scattering dot array on the bottom. The angular divergence of emerging light from the light guide plate can be well constrained so as to exploit the angular range with the best transmission of polarized light for the wire grid polarizer. The prototype of a 2.5-inch module has demonstrated an angular divergence of 48°. The overall extraction efficiency of polarized light enhanced by 21% and uniformity of 76% have been achieved.

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