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Proceedings Paper

Polarization analysis of a twisted nematic liquid crystal display using a Poincare sphere
Author(s): Hidefumi Yoshida; Jack R. Kelly
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Paper Abstract

Twisted nematic liquid crystal displays (TN-LCD) are being widely adopted for personal computers. Figure 1 shows the transmittance -voltage (T-V) characteristics for the normally - white mode of a first minimum TN display. Here the polarizer transmission axis is parallel to the liquid crystal (LC) alignment direction on the adjacent substrates (e-mode TN-LCD). Figure 2 shows the viewing angles. In the lower azimuth view, the T-V curve oscillates, causing gray scale image inversion. In the upper azimuth view, the transmittance at an intermediate voltage is high and the gray scale image washes out. In the right and left azimuth view, the T-V curve is almost the same as a normal view, giving a clear gray scale image. The symmetry of viewing characteristics has been investigated 1), and light propagation in the normal direction has been calculated using a Poincaré sphere2. Light propagation for oblique viewing had not yet been examined. We investigated this using a Poincaré sphere.

Paper Details

Date Published: 16 August 1996
PDF: 4 pages
Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); doi: 10.1117/12.246258
Show Author Affiliations
Hidefumi Yoshida, Fujitsu Ltd. and Kent State Univ. (Japan)
Jack R. Kelly, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 2873:
International Symposium on Polarization Analysis and Applications to Device Technology
Toru Yoshizawa; Hideshi Yokota, Editor(s)

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