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Optical structure to improve the γ-curve distortion of a four-domain (4-D) twisted nematic liquid crystal cell

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Abstract

The γ-curve represents the viewing angle characteristics of a liquid crystal (LC) cell in all gray levels, including the dark state. In this paper, we propose a optical configuration of a four-domain (4-D) twisted nematic (TN) LC cell for improving the γ-curve distortion in the oblique direction, without any deterioration in the optical property of a conventional 4-D TN cell. A positive A-plate and a negative A-plate are applied at the top and the bottom of the 4-D TN LC layer, respectively. The two A-films applied can be optimized at all viewing angles by calculating the polarization difference (Δ p ) as functions of the retardation and the optical axis of the films, so that the transmittance distortion in the middle gray scale can be compensated for in all viewing directions. As a result of a calculation of the gamma distortion index (GDI), the γ-curve can be improved by more than 70% in the off-axis at 0° and 180°, and by more than 50% in the off-axis at 90° and 270°.

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Authors and Affiliations

  1. Department of Electronics Engineering, Dong-A University, Pusan, 604-714, Korea

    Byung-June Mun, Tae Young Jin & Gi-Dong Lee

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  1. Byung-June Mun
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  2. Tae Young Jin
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  3. Gi-Dong Lee
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Correspondence to Gi-Dong Lee.

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Mun, BJ., Jin, T.Y. & Lee, GD. Optical structure to improve the γ-curve distortion of a four-domain (4-D) twisted nematic liquid crystal cell. Journal of the Korean Physical Society 63, 1932–1936 (2013). https://doi.org/10.3938/jkps.63.1932

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  • DOI: https://doi.org/10.3938/jkps.63.1932

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