CN108761945A - 一种电响应的液晶调光器件 - Google Patents

一种电响应的液晶调光器件 Download PDF

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CN108761945A
CN108761945A CN201810350644.1A CN201810350644A CN108761945A CN 108761945 A CN108761945 A CN 108761945A CN 201810350644 A CN201810350644 A CN 201810350644A CN 108761945 A CN108761945 A CN 108761945A
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liquid crystal
crystal layer
polymer network
light modulation
modulation device
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CN108761945B (zh
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胡小文
孙海涛
杨文敏
赵威
周国富
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South China Normal University
Shenzhen Guohua Optoelectronics Co Ltd
Academy of Shenzhen Guohua Optoelectronics
Shenzhen Guohua Optoelectronics Research Institute
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South China Normal University
Shenzhen Guohua Optoelectronics Co Ltd
Shenzhen Guohua Optoelectronics Research Institute
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Priority to PCT/CN2018/109633 priority patent/WO2019200851A1/zh
Priority to US16/498,740 priority patent/US10901278B2/en
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Abstract

本发明公开了一种电响应的液晶调光器件，包括依次设置的透光导电基板一、聚合物网络稳定液晶层一、正性液晶层、聚合物网络稳定液晶层二和透光导电基板二，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二由液晶混合物经紫外光固化制得，所述液晶混合物包括正性液晶、手性掺杂剂、光引发剂和可光聚合的液晶单体，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二反射偏振方向相同的圆偏振光。本发明的液晶调光器件通过改变接入电压的大小来驱动各层内的正性液晶在不同状态之间转换，从而实现液晶调光器件模糊与透明、有色与无色的调节，在车窗玻璃，家居玻璃窗等方有着良好的应用前景。

Description

一种电响应的液晶调光器件
技术领域
本发明涉及建筑家居生活领域，尤其是涉及一种电响应的液晶调光器件。
背景技术
为了实现保护隐私与采光的平衡，一般会采用窗帘、百叶窗或镀膜等较传统的方式，其中镀膜玻璃可以很好的阻断可见光，但镀膜玻璃在光强较低的情况下无法很好的保护隐私，一旦镀膜成型就无法根据需要改变光学性能，且色彩较为单一。
基于液晶的智能玻璃可以根据需要调节光的透过与反射、散射等光学性能，且可以通过掺杂染料等物质获得较丰富的色彩，以染料掺杂彩色智能窗为例，通过外接电压控制液晶分子的转动来带动染料分子排列方式的改变，实现对阳光的透过或吸收，以满足人们的需求。但染料分子在紫外光的作用下会产生褪色等变化，影响染料掺杂智能窗的稳定性；由于染料分子无法达到理想的取向状态，因此在染料掺杂智能窗在透明状态时染料分子仍然存在吸收行为，使智能窗无法达到无色透明的状态。
发明内容
针对现有技术的不足，本发明所要解决的技术问题是提供一种电响应的液晶调光器件，能够在一定程度上可代替窗帘的作用，解决镀膜玻璃局限性且未使用染料，解决了染料的局限性。
本发明所采取的技术方案是：
本发明提供一种电响应的液晶调光器件，包括依次设置的透光导电基板一、聚合物网络稳定液晶层一、正性液晶层、聚合物网络稳定液晶层二和透光导电基板二，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二由液晶混合物经紫外光固化后制得，所述液晶混合物包括正性液晶、手性掺杂剂、光引发剂和可光聚合的液晶单体，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二反射偏振方向相同的圆偏振光。在紫外光下，可聚合的液晶单体在手性掺杂剂和光引发剂的作用下，形成聚合物网络，正性液晶分散在所述聚合物网络中。
优选地，所述液晶混合物包括50～88.9质量份的正性液晶、8～25质量份的手性掺杂剂、0.1～5质量份的光引发剂和3～20质量份的液晶单体。
优选地，所述手性掺杂剂为左旋手性掺杂剂或右旋手性掺杂剂，所述左旋手性掺杂剂为S1011、S811中的至少一种，所述右旋手性掺杂剂为R1011、R811中的至少一种。
优选地，所述液晶单体为HCM008、HCM009中的至少一种。
优选地，还包括电源组件，所述电源组件与所述透光导电基板一、透光导电基板二电性连接。
进一步地，所述电源组件包括交流电源和串联在所述交流电源上的电压控制器。
优选地，所述聚合物网络稳定液晶层一和聚合物网络稳定液晶层二的厚度为5～100μm。
优选地，所述正性液晶层的厚度为5～50μm。
本发明的有益效果是：
相较于液晶分散于聚合物网络的单一设置方式，本发明的电响应的液晶调光器件采用聚合物网络稳定液晶层一、正性液晶层和聚合物网络稳定液晶层二相结合的方式，在未施加电压时能够达到对某一波段的圆偏振光全反射的目的，此时液晶调光器件呈现深色透明状态，施加电压后，能够改变聚合物网络稳定液晶层和正性液晶层中的正性液晶的排向，通过改变接入电压的大小来驱动各层内的正性液晶在不同状态之间转换，从而调节对光的反射、散射或透过，致使所述液晶调光器件的状态按照深色透明、浅色透明、无色不透明、无色透明的顺序依次变化，进而实现液晶调光器件模糊与透明的调节，避免了单一设置方式无法改变器件颜色深浅的问题，在车窗玻璃，家居玻璃窗等方有着良好的应用前景。
附图说明
图1为本发明电响应的液晶调光器件的结构示意图；
图2为在未接电压状态下电响应的液晶调光器件的示意图；
图3为电响应的液晶调光器件为浅色透明状态时的示意图；
图4为电响应的液晶调光器件为无色不透明状态时的示意图；
图5为电响应的液晶调光器件为无色透明状态时的示意图。
具体实施方式
以下将结合实施例对本发明的构思及产生的技术效果进行清楚、完整地描述，以充分地理解本发明的目的、特征和效果。显然，所描述的实施例只是本发明的一部分实施例，而不是全部实施例，基于本发明的实施例，本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例，均属于本发明保护的范围。
实施例1
参见图1，本实施例提供一种电响应的液晶调光器件，包括依次设置的透光导电基板一10、聚合物网络稳定液晶层一20、正性液晶层3、聚合物网络稳定液晶层二21和透光导电基板二11，所述聚合物网络稳定液晶层一20和所述聚合物网络稳定液晶层二21由液晶混合物经紫外光固化制得，所述液晶混合物包括正性液晶HTW138200-100、手性掺杂剂S1011、光引发剂Irgacure651和可光聚合的液晶单体HCM009，所述聚合物网络稳定液晶层一20和所述聚合物网络稳定液晶层二21反射偏振方向相同的圆偏振光。
本实施例还提供一种上述电响应的液晶调光器件的制备方法，包括以下步骤：在黄光环境下，取15质量份的可聚合单体HCM009，9质量份的左旋手性掺杂剂S1011，0.5质量份的光引发剂Irgacure651，75.5质量份的正性液晶HTW138200-100置于棕色瓶中，在60℃下搅拌2小时，制成液晶混合物。在黄光条件下，将液晶混合物，刮涂棒和干净的透光导电玻璃基板加热到50℃，利用刮涂棒在基板上刮涂液晶混合物，刮涂的液晶混合物的厚度为15μm，利用200W功率的紫外光光源固化15min使液晶混合物中的可聚合液晶单体发生聚合反应形成聚合物网络稳定液晶层。待涂覆有聚合物网络稳定液晶层的导电玻璃基板降温至室温后，将相同的两个上述导电玻璃基板置于正己烷或环己烷中浸泡48小时，去除未反应的液晶分子和手性掺杂剂，然后置于真空干燥箱中60摄氏度干燥2小时，去除正己烷。将相同的两个附着有聚合物网络稳定液晶层的导电玻璃基板以有聚合物网络稳定液晶层的一面作为内表面，制成液晶盒，两块基板之间的间距为40μm，在70℃下将正性液晶HTW138200-100填充到上述液晶盒中后，将液晶盒自然降温至室温，制备得到电响应的液晶调光器件。
上述可聚合液晶单体HCM009(购于江苏和成显示科技股份有限公司)的化学结构式为
左旋手性掺杂剂S1011(购于北京八亿时空液晶科技股份有限公司)的结构式
光引发剂Irgacure-651(购于希恩思)的结构式为：
参见图2(图中设置虚框线的目的仅为清晰地区分聚合物网络稳定液晶层一、聚合物网络稳定液晶层网络稳定液晶二和正性液晶层)，在紫外光下，液晶混合物中的可聚合的液晶单体在手性掺杂剂和光引发剂的作用下形成聚合物网络4，正性液晶5分散在所述聚合物网络4中，在未施加电压时，分布在聚合物网络稳定液晶层一(图中A区域)和聚合物网络稳定液晶层二(图中C区域)中的正性液晶5在聚合物网络4的作用下呈分子长轴平行于基板的螺旋结构排列，能够反射偏振方向相同的圆偏振光(可以反射左旋偏振光或均可反射右旋偏振光)，在未通电状态下分布在聚合物网络稳定液晶层一和聚合物网络稳定液晶层二中的正性液晶的反射峰位于可见光波段，所述反射峰的位置由液晶混合物中手性掺杂剂的浓度决定，通过改变手性掺杂剂的浓度能够改变液晶调光器件的反射波段。本实施例中使用的是左旋手性掺杂剂，因此聚合物网络稳定液晶层一和聚合物网络稳定液晶层二均反射左旋偏振光，处于聚合物网络稳定液晶层一和聚合物网络稳定液晶层二中间的正性液晶层(图中B区域)能够将右旋偏振光转换成左旋偏振光，将左旋偏振光转换为右螺旋偏振光，当阳光射入时，对于特定波段的圆偏振光，聚合物网络稳定液晶层一能够将其中的左旋偏振光反射，透过右旋偏振光，正性液晶层将透过聚合物网络稳定液晶层一的右旋偏振光转换成左旋偏振光，后被聚合物网络稳定液晶层二反射，从而达到对某一波段的圆偏振光全反射的目的，此时液晶调光器件呈现深色透明状态。
施加电压后，通过改变接入电压的大小，所述分布在聚合物网络稳定液晶层一和聚合物网络稳定液晶层二内的正性液晶可以在分子长轴平行于基板的螺旋结构排列、焦锥相排列和分子长轴垂直于基板的排列这三种排列之间相互转换；所述分布在正性液晶层的正性液晶可以在分子长轴平行于基板的排列和分子长轴垂直于基板的排列之间相互转换。
参见图3，当外接电压较小时，由于正性液晶层(图中B区域)的正性液晶分子转为垂直于基板的排列方式，无法将左旋偏振光转换为右旋偏振光，将右旋偏振光转换为左旋偏振光，因此智能窗只能反射某一波段的左旋偏振光，此时液晶调光器件为浅色透明状态。
参见图4，当外接电压继续增大，分布在聚合物网络稳定液晶层一(图中A区域)和聚合物网络稳定液晶层二(图中C区域)内的正性液晶分子的排列方式转换为焦锥相排列，此时聚合物网络稳定液晶层一和聚合物网络稳定液晶层二对可见光具有强烈的散射作用，此时液晶调光器件为无色不透明状态。
参见图5，当外接电压足够大时，液晶调光器件内所有小分子液晶均转换为垂直于玻璃基板的排列方式，对光的透过没有影响，此时液晶调光器件为无色透明状态。
实施例2
本实施例提供一种电响应的液晶调光器件，包括依次设置的透光导电基板一、聚合物网络稳定液晶层一、正性液晶层、聚合物网络稳定液晶层二和透光导电基板二，所述聚合物网络稳定液晶层一和聚合物网络稳定液晶层二的厚度为100μm，正性液晶层的厚度为5μm，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二由液晶混合物经紫外光固化制得，所述液晶混合物包括88.9质量份的正性液晶E7、25质量份的右旋手性掺杂剂R811、0.1质量份的光引发剂Irgacure819和3质量份的可光聚合的液晶单体HCM008，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二反射右旋偏振光。
上述可聚合液晶单体HCM008(购于江苏和成显示科技股份有限公司)的化学结构式为
左旋手性掺杂剂R811(购于北京八亿时空液晶科技股份有限公司)，其结构式为：
光引发剂Irgacure-819(购于希恩思)的结构式为：
实施例3
本实施例提供一种电响应的液晶调光器件，包括依次设置的透光导电基板一、聚合物网络稳定液晶层一、正性液晶层、聚合物网络稳定液晶层二和透光导电基板二，所述聚合物网络稳定液晶层一和聚合物网络稳定液晶层二的厚度为5μm，正性液晶层的厚度为50μm，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二由液晶混合物经紫外光固化制得，所述液晶混合物包括80质量份的正性液晶E7、12质量份的左旋手性掺杂剂S811、3质量份的光引发剂Irgacure819和10质量份的可光聚合的液晶单体HCM008，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二反射左旋偏振光。

Claims (8)

1.一种电响应的液晶调光器件，其特征在于，包括依次设置的透光导电基板一、聚合物网络稳定液晶层一、正性液晶层、聚合物网络稳定液晶层二和透光导电基板二，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二由液晶混合物经紫外光固化制得，所述液晶混合物包括正性液晶、手性掺杂剂、光引发剂和可光聚合的液晶单体，所述聚合物网络稳定液晶层一和所述聚合物网络稳定液晶层二反射偏振方向相同的圆偏振光。
2.根据权利要求1所述的电响应的液晶调光器件，其特征在于，所述液晶混合物包括50～88.9质量份的正性液晶、8～25质量份的手性掺杂剂、0.1～5质量份的光引发剂和3～20质量份的液晶单体。
3.根据权利要求1或2所述的电响应的液晶调光器件，其特征在于，所述手性掺杂剂为左旋手性掺杂剂或右旋手性掺杂剂，所述左旋手性掺杂剂为S1011、S811中的至少一种，所述右旋手性掺杂剂为R1011、R811中的至少一种。
4.根据权利要求1或2所述的电响应的液晶调光器件，其特征在于，所述液晶单体为HCM008、HCM009中的至少一种。
5.根据权利要求1所述的电响应的液晶调光器件，其特征在于，还包括电源组件，所述电源组件与所述透光导电基板一、透光导电基板二电性连接。
6.根据权利要求5所述的电响应的液晶调光器件，其特征在于，所述电源组件包括交流电源和串联在所述交流电源上的电压控制器。
7.根据权利要求1所述的电响应的液晶调光器件，其特征在于，所述聚合物网络稳定液晶层一和聚合物网络稳定液晶层二的厚度为5～100μm。
8.根据权利要求1所述的电响应的液晶调光器件，其特征在于，所述正性液晶层的厚度为5～50μm。
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