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Category International Presentation
Paper Title Wide-Range Control of Liquid Crystal Anchoring Energy Based on Siloxane Oligomer Transfer
Conference name ACLC 2015
Author Jeng-Hun Suh, Bo-Yeon Lee, Jiyoon Kim, Se-Um Kim, Sin-Doo Lee
Paper code Place
page Year/date 2015/01/19
Abstract The surface alignment of liquid crystals (LCs) on various solid substrates has been extensively studied for understanding the interfacial interactions of the LC molecules and designing a variety of electro-optic (EO) devices. The alignment state of the LC molecules is characterized by several parameters such as the anchoring energy and the pretilt angles (polar and azimuthal) on the surface. Among the alignment parameters, the surface anchoring energy is the most important one since it predominantly affects the electrical response properties of the LC, for instance, the threshold voltage and the response time. Previously, a number of the approaches to the control of the anchoring energy, for example, mixed alignment layers, stacked dual alignment layers, degradation of alignment layer by ultra violet light and adsorption of the photo-reactive monomer have been suggested. However, the adjustable range of the anchoring energy is quite limited and the resultant EO properties of the LCs cannot be easily tailored.
In this work, we demonstrate a novel technique for controlling the anchoring energy of the LC in a relatively wide range through simple contact printing of polydimethylsiloxane (PDMS) oligomers onto the substrate. The amount of transferred PDMS oligomers was found to play a key role in manipulating the anchoring energy. This approach would be very useful for studying the relationship between the operation parameters of an LC device and the anchoring energy. Moreover, it provides a viable method of constructing wide-viewing LC cells with multi-domains.
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