Chinese Journal of Liquid Crystals and Displays, Volume. 38, Issue 8, 1022(2023)
Multidimensional anti-counterfeit technology enabled by a double-layered functional liquid crystal film
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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Fang WANG, Cong-long YUAN, Yi-fei WANG, Dong SHEN, Xiao-qian WANG, Zhi-gang ZHENG. 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
Category: Research Articles
Received: Apr. 6, 2023
Accepted: --
Published Online: Oct. 9, 2023
The Author Email: Xiao-qian WANG (xqwang@ecust.edu.cn), Zhi-gang ZHENG (zgzheng@ecust.edu.cn)