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首页> 外文期刊>Nature >Voltage-dependent anchoring of a nematic liquid crystal on a grating surface
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Voltage-dependent anchoring of a nematic liquid crystal on a grating surface

机译：向列型液晶在光栅表面上的电压依赖性锚固

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The switching properties of most liquid-crystal electro-optic devices rely mainly on the reorientation of the average molecular direction (director) within the bulk of the liquid-crystal layer. Reorientation of the director at or near the surfaces of the layer usually has an insignificant effect on device performance. Here we describe a different configuration in which a nematic liquid crystal is placed between a flat surface treated to induce a parallel anchoring of the director and a grating surface treated to give a perpendicular anchoring. We show that this configuration leads to an effective azimuthal anchoring at the grating surface that depends on the applied voltage when the nematic phase has negative dielectric anisotropy (that is, the director has a tendency to align perpendicular to the applied field). This leads to a voltage-controlled twist effect in the liquid-crystal cell that is highly sensitive to the grating profile. Furthermore, this twist effect possesses an electro-optic response which is far less dependent on viewing angle compared to many other liquid-crystal display configurations. We therefore suggest that this technology might find application in the next generation of liquid-crystal displays.
机译：大多数液晶电光器件的开关特性主要取决于液晶层整体内平均分子方向（方向）的重新定向。在该层的表面处或附近，指向矢的重新定向通常对器件性能的影响不大。在这里，我们描述了一种不同的配置，其中向列液晶放置在经过处理以诱导指向矢的平行锚固的平面与经过处理以提供垂直锚固的光栅表面之间。我们表明，当向列相具有负介电各向异性时（即指向矢具有垂直于外加电场取向的趋势），这种配置会导致有效的方位锚定在光栅表面，取决于所施加的电压。这导致液晶单元中的电压控制扭曲效应，该扭曲效应对光栅轮廓高度敏感。此外，与许多其他液晶显示器配置相比，这种扭曲效应具有电光响应，该电光响应对视角的依赖性小得多。因此，我们建议该技术可能会在下一代液晶显示器中找到应用。

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