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Crystals 2019, 9(2), 63; https://doi.org/10.3390/cryst9020063

Parameter Space Design of a Guest-Host Liquid Crystal Device for Transmittance Control

1
Department of Electronics Engineering, Pusan National University, Busan 46241, Korea
2
LG Chem R&D Campus Daejeon, Daejeon 34122, Korea
*
Author to whom correspondence should be addressed.
Received: 4 December 2018 / Revised: 31 December 2018 / Accepted: 22 January 2019 / Published: 26 January 2019
(This article belongs to the Special Issue Liquid Crystal Optics and Physics: Recent Advances and Prospects)
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Abstract

A transmittance-control device requires a high transmittance difference between its transparent and opaque states. In this paper, we propose a systematic approach to find the condition for the maximum transmittance difference in a guest-host liquid crystal (GHLC) cell. To this end, we calculated the transmittance difference as we varied the cell gap and dye concentration. The transmittance of a GHLC cell is dependent on the alignment of dye molecules, cell gap, and dye concentration. We used a constant-transmittance contour map to find the condition for the desired transmittance of LC cells in each state and the transmittance difference of each LC mode. We experimentally confirmed that the design of a GHLC cell with the desired performance could be achieved through the proposed design process. View Full-Text
Keywords: transmittance-control device; liquid crystal; guest-host liquid crystal; dichroic dye transmittance-control device; liquid crystal; guest-host liquid crystal; dichroic dye
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nam, S.-M.; Oh, S.-W.; Kim, S.-H.; Huh, J.-W.; Lim, E.; Kim, J.; Yoon, T.-H. Parameter Space Design of a Guest-Host Liquid Crystal Device for Transmittance Control. Crystals 2019, 9, 63.

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