Fig. 1. (a) Pattern of the cholesteric liquid crystal layer orientation; (b) Pattern of the guest-host liquid crystal layer orientation.

Fig. 2. (a) Reflection spectra of cholesteric liquid crystal doped with 2.9% (mass fraction) R5011, the red curve and blue interval represent the corresponding reflection spectra of cholesteric liquid crystal in the SD1 oriented region and non-oriented region respectively; (b) Transmission spectra of guest-host liquid crystal doped with 4.8% (mass fraction)dichroic dye in the case of incident light in different line polarization directions, the angles in the legend represent the angle between the polarization direction of the incident polarized light and the direction of the long axis of the guest-host liquid crystal arrangement; (c) Schematic diagram of the dichroic absorption principle of the guest-host liquid crystal system, the black arrows represent the polarization direction of the incident light.

Fig. 3. Schematic of the liquid crystal based multi-dimensional anti-counterfeiting device. The upper layer is the cholesteric liquid crystal layer, and the lower layer is the guest-host liquid crystal layer. The black colour represents the dichroic dye molecules, the blue colour represents the liquid crystal molecules, and the different grey scale areas in the“small pear”indicate the different orientation of the liquid crystal molecules.

Fig. 4. Differentiation of transmittance and reflection display under different film layer order of the anti-counterfeiting device . (a,b) Transmissive and reflective information display under natural light when the upper film layer is the cholesteric liquid crystal layer and the lower film layer is the guest-host liquid crystal layer; (c,d) Transmissive and reflective information display under natural light when the upper film layer is the guest-host liquid crystal layer and the lower film layer is the cholesteric liquid crystal layer.

Fig. 5. When the line polarized light is incident at the polarization angles of 0°, 45°, 90° and 135°, (a~d) the transmission display effect of the double liquid crystal anti-counterfeiting device when the upper film layer is the cholesteric liquid crystal layer and the lower film layer is the guest-host liquid crystal layer; (e~h) the transmission display effect of the double-layered liquid crystal anti-counterfeiting device when the upper film layer is the guest-host liquid crystal layer and the lower film layer is the cholesteric liquid crystal layer.

Fig. 6. (a) Diagram of the optical path device for testing line polarized light in the non- cholesteric liquid crystal reflective band passing through the cholesteric liquid crystal layer in the double liquid crystal anti-counterfeiting layer; (b) Clear brightness and darkness variation in the results of the outgoing light test.

Fig. 7. (a) Reflective display effect of the double-layered liquid crystal security device when the upper layer is a cholesteric liquid crystal layer and the lower layer is a guest-host liquid crystal layer; (b) Reflective display effect of the dual liquid crystal security device when the upper layer is a guest-host liquid crystal layer and the lower layer is a cholesteric liquid crystal layer.

Fig. 8. Difference in the transmission and reflection display of this double-layer anti-counterfeit layer device in which the upper film layer is the guest-host liquid crystal layer and the lower film layer is the cholesteric liquid crystal layer, corresponding to different modes of light illumination. (a) Information display under different viewing angles of 0°, 30°, and 60° in natural light reflection mode; (b) Information display under different viewing angles of 0°, 30°, and 60° in transmission mode corresponding to line polarized light. Where, θ indicates the observation angle.