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Wideband antireflective circular polarizer exhibiting a perfect dark state in organic light-emitting-diode display

Bong Choon Kim, Young Jin Lim, Je Hoon Song, Jun Hee Lee, Kwang-Un Jeong, Joong Hee Lee, Gi-Dong Lee, and Seung Hee Lee

Open Access Open Access

Abstract

We proposed wideband antireflective circular polarizer for realizing a true black state in all viewing directions in organic light-emitting-diode displays (OLEDs). Present commercialized wideband circular polarizer consisted of a half wave and a quarter wave plates having the refractive index parameter (Nz) of 1.5 in both films exhibits light leakage in the oblique viewing directions, deteriorating image quality of a black state. We evaluated Nzs of both films and proposed a new wideband antireflective circular polarizer with a perfect dark state in all viewing directions with Nz = 0.5 in both plates, which will greatly improve image quality of OLEDs.

© 2014 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a) Device configuration and (b) iso-luminance contour in dark state of the wide view circular polarizers.

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Fig. 2
Fig. 2 States of polarization inside a wideband antireflective film with Nz = 1.5 according to red, green, blue wavelengths on Poincaré sphere under (a) normal direction and (b) oblique direction (azimuthal angle = 60° and polar angle = 70°).

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Fig. 3
Fig. 3 Calculated iso-luminance contour in a dark state according to Nz of the wideband antireflective film.

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Fig. 4
Fig. 4 (a) States of polarization inside a wideband antireflective film with Nz = 0.5 according to red, green, blue wavelengths on Poincaré sphere under oblique direction (azimuthal angle = 60° and polar angle = 70°) and (b) calculated leakage of light along horizontal direction up to ± 80° of a polar angle according to Nz.

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