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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 4,
  • Issue 2,
  • pp. 129-138
  • (2008)

Wide-View and Broadband Circular Polarizers for Transflective Liquid Crystal Displays

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Abstract

A simple wide-view and broadband circular polarizer comprising of a linear polarizer and two uniaxial films is proposed to enhance the viewing angle of transflective liquid crystal displays (LCDs). For the transmissive mode, over the entire 90$^{\circ}$ viewing cone, the normalized light leakage from two stacked circular polarizers is suppressed to below 1.5$\times {\hbox{10}} ^{-2}$, and contrast ratio over 10:1 is obtained using a normally black vertically aligned transflective LCD. At the same time, this configuration warrants a broadband operation and reasonably good viewing angle (10:1 contrast ratio is over 40$^{\circ}$ at all directions) for the reflective mode. The physical mechanisms for achieving broadband operation and wide viewing angle are discussed.

© 2008 IEEE

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