Electrooptical threshold behavior of electroconvection in twisted nematic liquid crystal cells
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- 作者：Jae Min Song ; Gyu-Jin Choi ; Jin Seog Gwag…
- 关键词：Electroconvection ; Twisted liquid crystals ; Hydrodynamic instability
- 刊名：Journal of the Korean Physical Society
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：70
- 期：3
- 页码：276-280
- 全文大小：
- 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
- 出版者：The Korean Physical Society
- ISSN：1976-8524
- 卷排序：70
文摘
In this paper, the electrooptical threshold behavior of electroconvection caused by the electrohydrodynamic instability in twisted nematic liquid crystal cells is presented. We observed the electroconvection optically and analyzed the change in the electrical threshold behavior according to the twisted angles in twisted liquid crystal cells in the conduction region that shows the Williams domain, which is one of the most basic patterns for electroconvection in an anisotropic fluid like liquid crystals (LCs). As a result, we confirmed that in the low frequency conduction regio where the Williams domain appears, the threshold voltage decreased as the twist angle increased even though the twist structure enhanced the effective viscosity in liquid flow. The increase in the twist angle may shorten the charge relaxation time because a twisted LC is a structure that more easily accumulates electrical charges on local curvatures.