基于液晶图案化组装的宾主型显示器制备

Fabrication of guest-host display based on patterned assembly of liquid crystal

宾主液晶器件能够在保持视野清晰的前提下实现对光透过率的调节,已被广泛应用于透明显示领域。但由于其系统复杂,在一定程度上限制了实际应用。本文通过采用区域化聚合物模板技术,制备了一种分子平行组装和螺旋组装共存的图案化宾主液晶器件。基于两区域对外界刺激响应的差异性,调节电场和偏振方向可实现图案多灰度动态显示。结果表明:在电场控制模式下,染料液晶平行组装区域的光透过率从3.28%上升到63.22%,两区域的透过率对比度从0.41提高到5.12。在偏振方向控制模式下,平行组装区域的光透过率从3.28%升至65.45%,两区域的对比度从0.41升至4.54。所制备的宾主液晶器件具备结构简单、易于调谐等特点,可适应于不同场景下的图案显示,进一步推动了液晶器件在透明显示领域及光学防伪领域的应用和发展。

Guest-host liquid crystal devices have attracted significant attention in see-through display due to their ability to control the transmittance of light without sacrificing the resolution of image.However,such complicated systems limite their contributions in practical applications.Herein,we propose a novel guest-host liquid crystal device for transparent display,with the coexistence of parallel and helical assembled microstructure fabricated by patterned polymer template.By applying an electrical field or rotating the linear polarization of incident light,the dynamic multi-grayscale patterns have been achieved owing to the distinct responses of different regions.The experimental results indicate that,under the driving voltage,the transmittance of parallel microstructure regions increases from 3.28%to 63.22%,and meanwhile the contrast ratio between the two regions increases from 0.41 to 5.12.By changing the linear polarization of incidence,the transmittance of parallel region increases from 3.28%to 65.45%,and the contrast ratio also increases from 0.41 to 4.54.The proposed guest-host liquid crystal device is capable for patterned display in various scenarios due to its simple configuration and convenient tunability,thus making further advances offer more brilliant liquid crystal devices in diversified fields.