基于双层液晶功能膜的多维防伪技术  

Multidimensional anti-counterfeit technology enabled by a double-layered functional liquid crystal film

作　　者：王芳 袁丛龙 王翼飞 沈冬[2] 王骁乾 郑致刚 WANG Fang;YUAN Cong-long;WANG Yi-fei;SHEN Dong;WANG Xiao-qian;ZHENG Zhi-gang(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;Department of Physics,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]华东理工大学物理学院,上海200237

出　　处：《液晶与显示》2023年第8期1022-1030,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：国家重点研发计划(No.2022YFA1203700);国家自然科学基金(No.61822504,No.62275081,No.51873060,No.62035008);上海市教育委员会,上海市科技创新计划重大项目(No.2021-01-07-00-02-E00107);上海市教委,上海教育发展基金会曙光计划(No.21SG29)。

摘　　要：防伪与伪造之间的矛盾日益加深,研发保密性强、安全性高、不可复制的防伪技术已成为社会与经济发展的迫切需求。在此背景下,液晶防伪技术因其性能优异、实用性高、广受市场好评而成为备受关注的领域。然而,现有的防伪技术层次结构不够丰富,隐藏图文颜色单一,因此,本研究提出了一种双信息防伪层的器件结构,由宾主液晶防伪膜层和胆甾相液晶防伪膜层组成,每层包含不同的信息内容。通过不同的光照模式,可以获得不同的显示内容,从而达到了多维防伪的效果。相较于传统单层宾主液晶防伪膜层,该设计具有与偏振相关的透反射差异和在透射方向上不对称的光响应特点。使用这种易制备的防伪膜层叠加设计不仅提高了防伪码的安全水平,还降低了应用成本。The contradiction between counterfeiting and forgery is deepening,and the development of counterfeiting technology with strong confidentiality,high security,and non-reproducibility has become an urgent need for social and economic development.In this context,liquid crystal anti-counterfeiting technology has become an area of great interest due to its excellent performance,high practicality,and wide market appreciation.However,the existing anti-counterfeiting technology is not rich enough in hierarchy,and the hidden graphic is only one color.Therefore,this study proposes a device structure with a dual information security layer consisting of a guest-host liquid crystal anti-counterfeiting film layer and a cholesteric liquid crystal anti-counterfeiting film layer,each layer containing different information content.Through different light patterns,different display contents can be obtained,thus achieving a multidimensional anti-counterfeiting effect.The design features polarization-related transmission-reflection differences and an asymmetric light response in the transmission direction compared to conventional singlelayer guest-host liquid crystal anti-counterfeit film layers.The use of this easily prepared anti-counterfeit film layer overlay design not only improves the security level of the security code but also reduces the cost of application.

关 键 词：宾主液晶 二色性染料 胆甾相液晶 防伪 光配向 

分 类 号：O753.2[理学—晶体学]