TY - JOUR
T1 - Surface-Induced Parallel Alignment of Liquid Crystals by Linearly Polymerized Photopolymers
AU - Schadt, Martin
AU - Schmitt, Klaus
AU - Kozinkov, Vladimir
AU - Chigrinov, Vladimir
PY - 1992/7
Y1 - 1992/7
N2 - Photopolymerization of polymer-coated solid substrates with linearly polarized light is shown to induce an anisotropic, uniaxial orientation of polymer molecules. The linearly photopolymerized (LPP) layers exhibit UV dichroism and optical anisotropy. The resulting anisotropic dispersive surface interaction forces are shown to align adjacent liquid crystals parallel. A qualitative microscopic model is presented. The new LPP-alignment technique allows to generate homogeneous LC-director pattern with different azimuthal director angles on the same substrate requiring no mechanical treatment. The use of LPP substrates in liquid crystal displays (LCDs) is shown to enable to combine different electrooptical effects-such as twisted nematic (TN) and parallel configurations-in the same hybrid LCD. Besides from high-contrast LPP-aligned TN-LCDs, LPP-aligned supertwisted nematic (STN)-LCDs exhibiting steep transmission-voltage characteristics are presented.
AB - Photopolymerization of polymer-coated solid substrates with linearly polarized light is shown to induce an anisotropic, uniaxial orientation of polymer molecules. The linearly photopolymerized (LPP) layers exhibit UV dichroism and optical anisotropy. The resulting anisotropic dispersive surface interaction forces are shown to align adjacent liquid crystals parallel. A qualitative microscopic model is presented. The new LPP-alignment technique allows to generate homogeneous LC-director pattern with different azimuthal director angles on the same substrate requiring no mechanical treatment. The use of LPP substrates in liquid crystal displays (LCDs) is shown to enable to combine different electrooptical effects-such as twisted nematic (TN) and parallel configurations-in the same hybrid LCD. Besides from high-contrast LPP-aligned TN-LCDs, LPP-aligned supertwisted nematic (STN)-LCDs exhibiting steep transmission-voltage characteristics are presented.
KW - Liquid crystal alignment
KW - Liquid crystal displays
KW - Liquid crystals
KW - Liquid-crystal-surface interaction
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:A1992JU82200023
UR - https://openalex.org/W2127353965
UR - https://www.scopus.com/pages/publications/0026896169
U2 - 10.1143/JJAP.31.2155
DO - 10.1143/JJAP.31.2155
M3 - Journal Article
SN - 0021-4922
VL - 31
SP - 2155
EP - 2164
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
IS - 7 R
ER -