Preparation of anisotropic films for liquid crystal display applications

Chain-Shu Hsu; Hwai-Len Chen

doi:10.1117/12.311071

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17 June 1998 Preparation of anisotropic films for liquid crystal display applications

Chain-Shu Hsu, Hwai-Len Chen

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Proceedings Volume 3421, Display Technologies II; (1998) https://doi.org/10.1117/12.311071
Event: Asia Pacific Symposium on Optoelectronics '98, 1998, Taipei, Taiwan

Abstract

The photoinitated polymerization of 2-chloro-1, 4-phenylene bis[4-(6-(acryloyloxy)hexyloxy)benzoate] (1M) and trans-1, 4-bis(4-(2-(2,3-epoxypropyloxy)-ethoxy)-phenyl)- cyclohexyldicarboxylate (3M) were studied. Both monomers exhibit a wide temperature range of nematic phase. The monomers were oriented in their nematic phase at a substrate having been coated with polyimide and unidirectionally rubbed with a nylon cloth. During polymerization, the ordering of the LC molecules was fixed, yielding a uniaxially crosslinked network. The clear LC networks exhibit a birefringence between 0.14 and 0.19, depending on the polymerization temperature. Finally, the nonmesogenic diluents. Tetra(ethylene glycol) diacrylate and 1,2-bis(2,3- bis(2,3-epoxypropyloxy)ethane were mixed with monomers 1M and 3M, subsequently decreasing the birefringences of the obtained LC networks. The LC networks containing non- mesogenic diluent exhibit not only a smaller birefringence but also a weaker birefringence dispersion in the visible region.

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Chain-Shu Hsu and Hwai-Len Chen "Preparation of anisotropic films for liquid crystal display applications", Proc. SPIE 3421, Display Technologies II, (17 June 1998); https://doi.org/10.1117/12.311071

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