Author： Kim Taehyung Kim Sunhwan Choi Suk-Won
Publisher： Taylor & Francis Ltd
ISSN： 0267-8292
Source： Liquid Crystals, Vol.40, Iss.9, 2013-09, pp. : 1223-1226
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Abstract
The twisted nematic (TN) mode is often employed when using three-dimensional active retarder (3DAR) technology, owing to its many merits such as low operating voltage, high aperture ratio and large cell-gap tolerance. However, an unexpected problem with the TN mode is that it leads to an asymmetric contrast ratio (CR) between the normally white TN (NW-TN) mode and normally black TN (NB-TN) mode due to the dispersion characteristics caused by the 90° twist angle. To overcome this problem, we designed a film compensation method using numerical calculations and validated it through experiments. Using our optical configuration, asymmetric CRs can be drastically improved.
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