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

WANG Fang; YUAN Cong-long; WANG Yi-fei; SHEN Dong; WANG Xiao-qian; ZHENG Zhi-gang

doi:10.37188/CJLCD.2023-0128

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

Device Physics and Device Preparation | 更新时间：2023-08-10

- Multidimensional anti-counterfeit technology enabled by a double-layered functional liquid crystal film
- Chinese Journal of Liquid Crystals and Displays Vol. 38, Issue 8, Pages: 1022-1030(2023)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  National Key Research and Development Program of China(2022YFA1203700);National Science Foundation of China(61822504;62275081;51873060;62035008);Innovation Program of Shanghai Municipal Education Commission(2021-01-07-00-02-E00107);“Shuguang Program” of Shanghai Education Development Foundation and Shanghai Municipal Education Commission(21SG29)
- DOI：10.37188/CJLCD.2023-0128
  CLC： O753⁺.2
- Received：06 April 2023，
  
  Revised：23 April 2023，
  
  Published：05 August 2023
- 稿件说明：
移动端阅览
WANG Fang, YUAN Cong-long, WANG Yi-fei, et al. Multidimensional anti-counterfeit technology enabled by a double-layered functional liquid crystal film[J]. Chinese journal of liquid crystals and displays, 2023, 38(8): 1022-1030.
DOI：

WANG Fang, YUAN Cong-long, WANG Yi-fei, et al. Multidimensional anti-counterfeit technology enabled by a double-layered functional liquid crystal film[J]. Chinese journal of liquid crystals and displays, 2023, 38(8): 1022-1030. DOI： 10.37188/CJLCD.2023-0128.

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。

Abstract

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 multi-dimensional anti-counterfeiting effect. The design features polarization-related transmission-reflection differences and an asymmetric light response in the transmission direction compared to conventional single-layer 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.

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