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Study of the vertically aligned in-plane switching liquid crystal mode in microscale periodic electric fields

机译:微尺度周期电场中垂直取向的面内切换液晶模式的研究

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摘要

The ongoing interest in fast liquid crystal (LC) modes stimulated by display technology and new applications has motivated us to study in detail the in-plane switching (IPS) vertically aligned (VA) mode. We have studied how the decrease of the period of the interdigitated electrodes (down to sub-micrometer scale) influences the switching speed, especially the LC relaxation to the initial homeotropic state. We have found that there are two types of the relaxation: a fast relaxation caused by the surface LC sub-layer deformed in the vicinity of the electrodes and the slower relaxation of the bulk LC. The speed of the fast (surface) mode is defined by half of a period of the electrode grating, while the relaxation time of the bulk depends on the LC layer thickness and the length of the driving electric pulses. Thus, the use of the surface mode and the reduction of the electrode grating period can result in significant increase of switching speed compared to the traditional LC modes, where the bulk relaxation dominates in electrooptical response. We have studied thoroughly the conditions defining the surface mode applicability. The numerical simulations are in good agreement with experimental measurements.
机译:显示技术和新应用激发了人们对快速液晶(LC)模式的持续关注,这促使我们详细研究平面内切换(IPS)垂直排列(VA)模式。我们已经研究了交叉指状电极周期的减小(减小到亚微米级)如何影响开关速度,尤其是LC松弛到初始垂直状态。我们发现弛豫有两种类型:由在电极附近变形的表面LC子层引起的快速弛豫和整体LC的较慢弛豫。快速(表面)模式的速度由电极光栅周期的一半定义,而块体的弛豫时间取决于LC层厚度和驱动电脉冲的长度。因此,与传统的LC模式相比,表面模式的使用和电极光栅周期的减少可导致开关速度的显着提高,在传统的LC模式中,体弛豫在电光响应中占主导地位。我们已经彻底研究了定义表面模式适用性的条件。数值模拟与实验测量非常吻合。

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