Dependence of viewing angle characteristics on pretilt angle in the in-plane switching mode
作者:
MASAHITO OH-E,
MAKOTO YONEYA,
MASUYUKI OHTA,
KATSUMI KONDO,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 4
页码: 391-400
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209108
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Viewing angle characteristics were systematically obtained when using in-plane switching (IPS) of liquid crystals. Although the IPS mode originally shows stable electro-optical performance regardless of viewing directions, the viewing angle characteristics are found to be strongly dependent on pretilt angle (slant angle of the liquid crystals from the substrate). Experimentally, the smaller the pretilt angle of the liquid crystal, the much wider the viewing angle characteristics, while larger pretilt angles of liquid crystals cause the characteristics to deteriorate. This deterioration occurs in a particular viewing direction, i.e. at right angles to the initial orientation direction of the liquid crystal when there is no in-plane electric field. The experimentally observed behaviour of the viewing angle dependence on the pretilt angle was also confirmed by computer simulations. Calculated iso-contrast contour lines, as a function of the pretilt angles, nearly coincide with the experimentally obtained viewing angle characteristics of the contrast ratio.
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