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Stabilizing blue phase liquid crystals with linearly polarized UV light

机译：用线偏振紫外线稳定蓝相液晶

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Polymer-stabilized blue-phase liquid crystal (PS-BPLC) has become an increasingly important technology trend for information display and photonic applications. BPLC exhibits several attractive features, such as reasonably wide temperature range, submillisecond gray-to-gray response time, no need for alignment layer, optically isotropic voltage-off state, and large cell gap tolerance when an in-plane switching (IPS) cell is employed. However, some bottlenecks such as high operation voltage, relatively low transmittance, and noticeable hysteresis and prolonged response time at high field region for IPS mode, still remain to be overcome before widespread application of BPLC can be realized. To reduce operation voltage, both new BPLC materials and new device structures have been investigated. In this paper, we demonstrate the stabilization a photopolymer-embedded blue phase liquid crystal precursor using a linearly polarized UV light for first time. When the UV polarization axis is perpendicular to the stripe electrodes of an IPS cell, anisotropic polymer networks are formed through the linear photo-polymerization process and the electrostriction effect is suppressed. As a result, the measured hysteresis is dramatically reduced from 6.95% to 0.36% and the response time shortened by ～2X compared to unpolarized UV exposure. To induce larger anisotropy in polymer networks for mitigating the electrostriction effect, high-intensity linearly polarized UV exposure is preferred. It is foreseeable this method will guide future BPLC device and material development as well as manufacturing process. The dawn of BPLCD is near.
机译：聚合物稳定的蓝相液晶（PS-BPLC）已成为信息显示和光子应用中越来越重要的技术趋势。 BPLC具有一些吸引人的功能，例如，合理的温度范围，亚毫秒级的灰至灰色响应时间，不需要取向层，光学各向同性的电压关闭状态以及面内切换（IPS）电池时的较大电池间隙容限被雇用。但是，在实现BPLC的广泛应用之前，仍然需要克服一些瓶颈，例如高工作电压，相对较低的透射率，明显的磁滞现象以及在高场区域对于IPS模式的响应时间延长。为了降低工作电压，已经研究了新的BPLC材料和新的器件结构。在本文中，我们首次展示了使用线偏振紫外光稳定化嵌入光敏聚合物的蓝相液晶前体的方法。当UV偏振轴垂直于IPS电池的条状电极时，通过线性光聚合过程形成各向异性的聚合物网络，从而抑制了电致伸缩效应。结果，与未偏振的UV曝光相比，测得的磁滞从6.95％大大降低至0.36％，响应时间缩短了约2倍。为了在聚合物网络中引起较大的各向异性以减轻电致伸缩效应，优选高强度线性偏振UV曝光。可以预见，这种方法将指导未来的BPLC装置和材料开发以及制造过程。 BPLCD的曙光已近。

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