Optical component, optical encryption device and encryption method

Abstract

The application provides an optical element, an optical encryption device and an encryption method, and relates to the technical field of optical materials. The optical element is formed by stacking a liquid crystal cell based on a positive nematic liquid crystal layer and a phase retardation plate. By accurately controlling the stacking angle of the stretching direction of the phase retardation plate and the orientation direction of the orientation film, a twisted stacking structure is constructed, so that the optical element has high g lum , a high FOM value, multiple responsiveness and arbitrary patterning capability. In addition, the optical encryption device provided by the application is prepared based on the optical element. Since the optical encryption device includes polymerizable liquid crystal monomers and / or a second fluorescent dye doped in the positive nematic liquid crystal layer, the circularly polarized luminescence generated by the optical element can be adjusted by multiple external stimuli, so that the optical encryption device can be designed by multiple encryption methods, and application requirements in the fields of multi-dimensional data coding, high-level anti-counterfeiting and information encryption can be met.

Description

Technical Field

[0001] This application relates to the field of optical materials technology, and more specifically, to an optical component, an optical encryption device, and an encryption method. Background Technology

[0002] With the rapid development of information technology, the demand for security and efficiency in information storage and encryption is increasing. Circularly polarized light-emitting (CPL) materials, due to their unique chiral optical properties and inherent chiral optical information dimension, show great potential in the field of multidimensional data encoding. While traditional chiral liquid crystal systems can achieve high CPL asymmetry factors (g... lum However, this often comes with a loss of nearly 50% in luminous efficiency, resulting in a low factor of quality (FOM) and limiting its practical applications. Furthermore, existing CPL materials struggle to simultaneously possess high gamma luminescence efficiency. lum While high FOM values, multi-response properties, and arbitrary patterning capabilities are present, they cannot meet the diverse demands of modern information processing and security protection for high-performance materials. Therefore, the development of novel CPL materials is of crucial significance. Summary of the Invention

[0003] In view of this, this application provides an optical component, an optical encryption device, and an encryption method, effectively solving the technical problems existing in the prior art, and not only providing high-g lum With optical components featuring high FOM values, multi-response capabilities, and arbitrary patterning ability, it is also possible to design optical encryption devices based on these optical components using different encryption methods, meeting application needs in fields such as multidimensional data encoding, advanced anti-counterfeiting, and information encryption.

[0004] To achieve the above objectives, the technical solution provided in this application is as follows:

[0005] An optical component, comprising:

[0006] A liquid crystal cell, comprising: a sealed housing; a first electrode and a second electrode, the first electrode and the second electrode being located within the sealed housing and disposed opposite to each other; a first alignment film and a second alignment film, the first alignment film being located on the side of the first electrode facing the second electrode, and the second alignment film being located on the side of the second electrode facing the first electrode, and the first alignment film and the second alignment film having the same orientation direction; and a positive liquid crystal layer, the positive nematic liquid crystal layer being located between the first alignment film and the second alignment film, and the positive nematic liquid crystal layer being doped with a first fluorescent dye and a photoinitiator;

[0007] A phase retardation film covers the surface of the liquid crystal cell on the first electrode side, and the stretching direction of the phase retardation film forms an angle of -90° to +90° with the orientation direction of the first alignment film.

[0008] Optionally, the material of the positive nematic liquid crystal layer includes at least one of E7, 5CB, 6CB, and 8CB;

[0009] And / or, the first fluorescent dye includes at least one of coumarin 6, rubrene, 9,10-dimethylanthracene, and Nile red;

[0010] And / or, the photoinitiator includes at least one of I-651 and I-1173;

[0011] And / or, the material of the phase delay film includes at least one of PVA, PE, PET, and D4.

[0012] Optionally, the doping concentration of the first fluorescent dye is 0.01 to 50.25 wt%.

[0013] Based on the same inventive concept, this application also provides an optical encryption device, comprising:

[0014] At least one of the aforementioned optical components, the optical component further comprising polymerizable liquid crystal monomers and / or a second fluorescent dye doped in the positive nematic liquid crystal layer, wherein the first fluorescent dye and the second fluorescent dye satisfy the fluorescence resonance energy transfer condition.

[0015] Optionally, the polymerizable liquid crystal monomer includes at least one of RM257, RM82, and LC756;

[0016] And / or, the second fluorescent dye comprises spiropyran.

[0017] Based on the same inventive concept, this application also provides an encryption method applied to the aforementioned optical encryption device, wherein the optical component further includes polymerizable liquid crystal monomers doped in the positive nematic liquid crystal layer, and the encryption method includes:

[0018] The optical components are stimulated by the encryption mask, causing the polymerizable liquid crystal monomers of the optical components at the encryption pattern to polymerize into solid liquid crystal polymers, wherein the encryption pattern is a cutout pattern of the encryption mask.

[0019] Alternatively, the encryption method includes:

[0020] A preset voltage is applied to the first electrode and the second electrode;

[0021] Stimulating the optical components based on the encryption mask causes the polymerizable liquid crystal monomers of the optical components at the encryption pattern to polymerize into a solid liquid crystal polymer, wherein the encryption pattern is a cutout pattern of the encryption mask.

[0022] Based on the same inventive concept, this application also provides an encryption method applied to the aforementioned optical encryption device, wherein the optical component further includes a second fluorescent dye doped in the positive nematic liquid crystal layer, and the encryption method includes:

[0023] The optical component is stimulated based on the first encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the first encryption pattern, wherein the first encryption pattern is a hollow pattern of the first encryption mask.

[0024] Optionally, the encryption method further includes:

[0025] The second fluorescent dye at the first encryption pattern is deactivated by controlling the optical component.

[0026] The optical component is stimulated by the second encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the second encryption pattern, wherein the second encryption pattern is a hollow pattern of the second encryption mask.

[0027] Based on the same inventive concept, this application also provides an encryption method applied to the aforementioned optical encryption device, wherein the optical component further includes polymerizable liquid crystal monomers and a second fluorescent dye doped in the positive nematic liquid crystal layer, wherein the encryption method includes:

[0028] Stimulating the optical component based on the third encryption mask causes the polymerizable liquid crystal monomers of the optical component at the third encryption pattern to polymerize into a solid liquid crystal polymer. At the same time, the optical component achieves fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the third encryption pattern. The third encryption pattern includes a polymerization region and a first encryption part. The third encryption pattern is a cutout pattern of the third encryption mask.

[0029] A preset voltage is applied to the first electrode and the second electrode;

[0030] The optical component is stimulated by the fourth encryption mask, causing the polymerizable liquid crystal monomers of the optical component at the second encryption part of the polymerization region to polymerize into a solid liquid crystal polymer, while controlling the second fluorescent dye of the optical component at the second encryption part to become ineffective.

[0031] Optionally, after stimulating the optical component based on the fourth encryption mask, the encryption method further includes: controlling the second fluorescent dye of the optical component to become ineffective;

[0032] Optionally, after the second fluorescent dye controlling the optical component fails, the encryption method further includes:

[0033] The optical component is stimulated by the fifth encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye in the aggregation region outside the second encryption part and the first encryption part. The fifth encryption mask has a hollow pattern corresponding to the aggregation region outside the second encryption part and the first encryption part.

[0034] Compared with existing technologies, the technical solution provided in this application has at least the following advantages:

[0035] This application provides an optical component, an optical encryption device, and an encryption method. The optical component includes: a liquid crystal cell, the liquid crystal cell comprising: a sealed housing; a first electrode and a second electrode, the first electrode and the second electrode being located within the sealed housing and disposed opposite to each other; a first alignment film and a second alignment film, the first alignment film being located on the side of the first electrode facing the second electrode, and the second alignment film being located on the side of the second electrode facing the first electrode, and the first alignment film and the second alignment film having the same orientation direction; a positive liquid crystal layer, the positive nematic liquid crystal layer being located between the first alignment film and the second alignment film, and the positive nematic liquid crystal layer being doped with a first fluorescent dye and a photoinitiator; and a phase retardation sheet, the phase retardation sheet covering the surface of the liquid crystal cell on the side of the first electrode, the stretching direction of the phase retardation sheet forming an angle of -90° to +90° with the orientation direction of the first alignment film.

[0036] As can be seen from the above, the technical solution provided in this application uses a liquid crystal cell based on a positive nematic liquid crystal layer and a phase retardation film stacked together to form optical components. By precisely controlling the stacking angle of the stretching direction of the phase retardation film and the orientation direction of the alignment film, a twisted stacking structure is constructed, thereby building a high-g structure. lum The liquid crystal cell, composed of a positive nematic liquid crystal layer, a doped first fluorescent dye, and a photoinitiator, not only allows for arbitrary shape and pattern design but also provides excellent linearly polarized light emission. Furthermore, the liquid crystal can be modulated by the electric fields of the first and second electrodes to achieve multi-response characteristics, thus enabling the optical components provided in this application to possess high g-value. lumIt features high FOM value, multi-response capability, and arbitrary patterning ability. Furthermore, the optical encryption device provided in this application is fabricated based on optical components. Because the optical encryption device includes polymerizable liquid crystal monomers and / or a second fluorescent dye doped in a positive nematic liquid crystal layer, the circularly polarized light emitted by the optical components can be modulated by various external stimuli. This allows for the design of multiple encryption methods for the optical encryption device, meeting the application needs in fields such as multidimensional data encoding, advanced anti-counterfeiting, and information encryption. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an optical component provided in an embodiment of this application;

[0039] Figure 2 A schematic diagram showing the angle between the orientation direction and the stretching direction provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the structure of an optical encryption device provided in an embodiment of this application;

[0041] Figure 4 A schematic diagram of an encryption principle provided for an embodiment of this application;

[0042] Figure 5 This is a schematic diagram illustrating another encryption principle provided in an embodiment of this application;

[0043] Figure 6 This is another schematic diagram of an encryption principle provided in the embodiments of this application;

[0044] Figure 7 This is a schematic diagram of another encryption principle provided in an embodiment of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] As described in the background section, with the rapid development of information technology, the demand for security and efficiency in information storage and encryption is increasing. Circularly polarized light-emitting materials (CPLs) exhibit great potential in the field of multidimensional data encoding due to their unique chiral optical properties and inherent chiral optical information dimension. While traditional chiral liquid crystal systems can achieve high CPL asymmetry factors, they are often accompanied by a nearly 50% loss in luminous efficiency, resulting in a low quality factor and limiting their practical applications. Furthermore, existing CPL materials struggle to simultaneously possess high gamma spectral density. lum While high FOM values, multi-response properties, and arbitrary patterning capabilities are present, they cannot meet the diverse demands of modern information processing and security protection for high-performance materials. Therefore, the development of novel CPL materials is of crucial significance.

[0047] Based on this, the embodiments of this application provide an optical component, an optical encryption device, and an encryption method, effectively solving the technical problems existing in the prior art, and not only providing high g-bit encryption... lum With optical components featuring high FOM values, multi-response capabilities, and arbitrary patterning ability, it is also possible to design optical encryption devices based on these optical components using different encryption methods, meeting application needs in fields such as multidimensional data encoding, advanced anti-counterfeiting, and information encryption.

[0048] To achieve the above objectives, the technical solutions provided in this application are as follows, in specific combination with... Figures 1 to 7 The technical solutions provided in the embodiments of this application will be described in detail.

[0049] Combination Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the result of an optical component provided in an embodiment of this application. Figure 2This is a schematic diagram illustrating the angle between an orientation direction and a stretching direction provided in an embodiment of this application. The optical component provided in this embodiment includes: a liquid crystal cell 100, comprising: a sealed housing 110; a first electrode 121 and a second electrode 122, the first electrode 121 and the second electrode 122 being located within the sealed housing 110 and disposed opposite to each other; a first alignment film 131 and a second alignment film 132, the first alignment film 131 being located on the side of the first electrode 121 facing the second electrode 122, and the second alignment film 132 being located on the side of the second electrode 122 facing the first electrode 121, and the first alignment film 131 and the second alignment film 132 having the same orientation direction A1; and a positive nematic liquid crystal layer 140, the positive nematic liquid crystal layer 140 being located between the first alignment film 131 and the second alignment film 132, and the positive nematic liquid crystal layer 140 being doped with a first fluorescent dye and a photoinitiator. A phase retardation film 200 covers the surface of the liquid crystal cell 100 on the side of the first electrode 121. The stretching direction A2 of the phase retardation film 200 and the orientation direction A1 of the first alignment film 131 form an angle of -90° to +90°.

[0050] It should be noted that the stretching direction A2 and orientation direction A1 provided in this application embodiment are both directions parallel to the plane where the liquid crystal cell 100 is located. When the angle between the stretching direction A2 and the orientation direction A1 is a positive angle, the circularly polarized light emitted by the optical components is left-handed circularly polarized light; conversely, when the angle between the stretching direction A2 and the orientation direction A1 is a negative angle, the circularly polarized light emitted by the optical components is right-handed circularly polarized light. (Continue to refer to...) Figure 2 As shown, when the angle between the stretching direction A2 and the orientation direction A1 is a positive angle, the positive angle is the angle formed by rotating the stretching direction A2 relative to the orientation direction A1 in a clockwise direction, such as... Figure 2 The angle between the stretching direction A2 and the orientation direction A1 shown in (A) is +45°. Conversely, when the angle between the stretching direction A2 and the orientation direction A1 is negative, the negative angle is the angle formed by rotating the stretching direction A2 counterclockwise relative to the orientation direction A1, as shown in (A). Figure 2 The angle between the stretching direction A2 and the orientation direction A1 shown in (B) is -45°. When the angle between the stretching direction A2 and the orientation direction A1 is 0°, the stretching direction A2 and the orientation direction A1 are parallel. In some embodiments, the angle between the stretching direction A2 and the orientation direction A1 provided in this application can be +45° or -45°. This application does not impose specific limitations on this, and in practical applications, other angles can be designed according to actual needs.

[0051] As can be seen from the above, the technical solution provided in this application uses a liquid crystal cell 100 based on a positive nematic liquid crystal layer 140 and a phase retardation film 200 stacked together. By precisely controlling the stacking angle of the stretching direction A2 of the phase retardation film 200 and the alignment direction A1 of the alignment film, a twisted stacking structure is constructed. Based on the Jones matrix mechanism, a luminous efficiency of 95% is achieved, thus constructing a high-g... lum And high FOM value system, in which g lum The gamma value can reach up to 1.28, and the FOM value can reach up to 1.22. The liquid crystal cell 100 is composed of a positive nematic liquid crystal layer 140, a doped first fluorescent dye, and a photoinitiator. This allows for arbitrary shape and pattern design of the liquid crystal cell 100, and it also provides excellent linearly polarized light emission. Furthermore, by adjusting the liquid crystal through the electric fields of the first electrode 121 and the second electrode 122, multi-response properties are achieved. Therefore, the optical components provided in this embodiment have high gamma values. lum It features high FOM value, multi-responsiveness, and arbitrary patterning capabilities.

[0052] Understandably, the liquid crystal is modulated by the electric field of the first electrode 121 and the second electrode 122, that is, by utilizing the electro-optic effect of positive nematic liquid crystal, the orientation of liquid crystal molecules is changed in the perpendicular electric field (the direction perpendicular to the plane where the liquid crystal cell 100 is located) of the first electrode 121 and the second electrode 122, thereby achieving reversible adjustment of the intensity of the circularly polarized light emission signal. In this embodiment, the voltage applied to the first electrode 121 and the second electrode 122 can be a 40V sinusoidal voltage with a frequency of 1kHz.

[0053] In some embodiments, the material of the positive nematic liquid crystal layer 140 provided in this application may include at least one of E7, 5CB, 6CB, and 8CB. And / or, the first fluorescent dye includes at least one of coumarin 6, rubrene, 9,10-dimethylanthracene, and Nile Red. And / or, the photoinitiator includes at least one of I-651 and I-1173. And / or, the material of the phase retardation sheet 200 includes at least one of PVA (polyvinyl alcohol), PE (polyethylene), PET (dibutyl terephthalate), and D4 (waterborne polyurethane). Furthermore, the first electrode 121 and the second electrode 122 provided in this application may be transparent electrodes, and their materials may include indium tin oxide, etc. It should be noted that the positive nematic liquid crystal layer 140, the first fluorescent dye, the photoinitiator, the phase retardation sheet 200, the first electrode 121, and the second electrode 122 provided in this application are not limited to the materials provided above. Other materials may be selected in some other embodiments of this application, and this application does not impose specific limitations on them.

[0054] In some embodiments, the doping concentration of the first fluorescent dye provided in this application embodiment can be 0.01 to 50.25 wt%. Also, the cell thickness of the liquid crystal cell 100 provided in this application embodiment (i.e., the thickness of the positive nematic liquid crystal layer 140) can be 7-36 micrometers.

[0055] The optical components provided in this application will be described in more detail below, based on the fabrication process of the optical components provided in the embodiments of this application. First, a liquid crystal cell 100 is prepared. A mixture containing a positive nematic liquid crystal material, a first fluorescent dye, and a photoinitiator is heated to a set temperature (the set temperature can be 70 to 150 degrees Celsius) and injected into the liquid crystal cell 100 (i.e., injected between the opposing first alignment film 131 and second alignment film 132) after being in an isotropic state for a certain period of time. The mixture is then cooled to room temperature and polymerized by irradiation with 365nm ultraviolet light for a set period of time (the set period can be 30 minutes). Then, a phase retardation sheet 200 is prepared. A polymer film of a preset material and a preset thickness (the preset thickness can be 80 micrometers) is uniaxially stretched and aligned (i.e., stretched in direction A2) to obtain the phase retardation sheet 200. The phase retardation sheet 200 is then covered on the prepared liquid crystal cell 100. The stacking angle is precisely controlled to construct a twisted stacking structure. The stacking angle (i.e., the alignment direction A1 and the stretching direction A2) can be -90° to +90°.

[0056] In some embodiments, the material of the positive nematic liquid crystal layer 140 of the optical component provided in this application can be E7, the first fluorescent dye can be coumarin 6 (3-(2-benzothiazolyl)-7-(diethylamino)), the photoinitiator can be I-651 (2,2-dimethoxy-2-phenylacetophenone), and the material of the phase retardation film 200 can be polyvinyl alcohol (PVA). The fabrication process of the optical component may include: firstly, preparing a liquid crystal cell 100, heating a mixture containing E7, coumarin 6, and I-651 to 120 degrees Celsius to achieve an isotropic state and then injecting it into the liquid crystal cell 100, maintaining it at 120 degrees Celsius for 10 minutes, cooling it to room temperature at a rate of 2 degrees Celsius / min, and then irradiating it with 365nm ultraviolet light for 30 minutes for polymerization, wherein the doping concentration of coumarin 6 is optimized and determined to be in the range of 0.01-50.25 wt% to balance luminous efficiency and optical activity. Then, a phase retardation film 200 is prepared by uniaxially stretching an 80-micrometer-thick PVA film, with the stretching degree being twice the original value. Optionally, the phase retardation film 200 provided in this embodiment can be obtained by stretching an 80-micrometer-thick PVA film at 85 degrees Celsius with a stretching degree of γ=6.3 using a stretching device. Specifically, the PVA film is balanced at 85 degrees Celsius for 10 minutes before stretching, and then stretched at a rate of 0.1 mm / s. The initial distance between the fixtures before stretching is 20 mm. The stretching degree γ is represented by the ratio of the semi-axis of an ellipse drawn on the stretched PVA film and calculated according to the formula (γ=a / b, where a is the length of the major semi-axis of the ellipse and b is the length of the minor semi-axis of the ellipse). Finally, the obtained phase retardation film 200 is covered on the prepared liquid crystal cell 100, and the stacking angle is precisely controlled to construct a twisted stacking structure to obtain an optical component, wherein the stacking angle can be +45° or -45°.

[0057] Based on the same inventive concept, embodiments of this application also provide an optical encryption device. (Reference) Figure 3 The diagram shown is a structural schematic of an optical encryption device provided in an embodiment of this application. The optical encryption device includes at least one optical component 10 provided in any of the above embodiments. The optical component 10 further includes a polymerizable liquid crystal monomer and / or a second fluorescent dye doped in the positive nematic liquid crystal layer 140, wherein the first fluorescent dye and the second fluorescent dye satisfy the fluorescence resonance energy transfer condition. In some embodiments, the polymerizable liquid crystal monomer provided in this application includes at least one of RM257, RM82, and LC756; and / or, the second fluorescent dye includes spiropyran. Figure 3 This illustrates an optical encryption device in which optical components 10 are arranged in an M*N array, such as... Figure 3The schematic diagram shows an optical encryption device with a 4x4 array arrangement. This application does not impose specific restrictions on the number and arrangement of the optical components 10 included in this optical encryption device, and specific design is required based on actual application.

[0058] Understandably, in the optical component 10 provided in this application embodiment, applying voltage to the first electrode 121 and the second electrode 122 can adjust the intensity of the circularly polarized light emission signal generated by the optical component 10. At this time, a circularly polarized light emission signal intensity not less than a set intensity (e.g., 110000) can be set to "1", and a circularly polarized light emission signal intensity less than the set intensity can be set to "0". Furthermore, the polymerizable liquid crystal monomers provided in this application embodiment undergo a polymerization reaction after being stimulated by external stimuli, such as polymerization after being irradiated by ultraviolet light. This results in different circularly polarized light emission at the polymerization point and the non-polymerized point of the optical component. In this case, stimulating the optical component 10 to polymerize with polymerizable liquid crystal monomers can be set to "1", and not stimulating the optical component 10 to polymerize with polymerizable liquid crystal monomers can be set to "0". The first and second fluorescent dyes provided in this application undergo fluorescence resonance energy transfer when stimulated by external stimuli, such as fluorescence resonance energy transfer after ultraviolet light irradiation. This results in different light colors emitted by the optical component at the location of fluorescence resonance energy transfer compared to the location where no fluorescence resonance energy transfer occurs. In this case, stimulating the optical component 10 with the first and second fluorescent dyes can be set to "1", while stimulating the optical component 10 without the first and second fluorescent dyes can be set to "0". Thus, by adjusting the circularly polarized emission signal intensity, applying aggregation stimulation, and stimulating the optical component 10 with fluorescent dyes, different fluorescence and circularly polarized emission changes can be achieved. Based on these changes and the number and arrangement of the optical components 10, optically controllable switchable logic gates, information encoding, and information encryption can be constructed. This meets the application needs in fields such as multi-dimensional data encoding, advanced anti-counterfeiting, and information encryption. It can not only integrate arrays to construct complex logic circuits to achieve multi-data-bit operation processing for logic computing chip development, but also increase the difficulty of information cracking, meet advanced encryption requirements, and effectively protect information security in visual displays.

[0059] Based on the same inventive concept, this application also provides an encryption method applied to the optical encryption device provided in any of the above embodiments. The optical component 10 further includes polymerizable liquid crystal monomers doped in the positive nematic liquid crystal layer 140. The encryption method includes: stimulating the optical component 10 based on an encryption mask, causing the polymerizable liquid crystal monomers at the encryption pattern of the optical component 10 to polymerize into a solid liquid crystal polymer. The encryption pattern is a cutout pattern of the encryption mask 21. It should be noted that the stimulation method of the optical component 10 provided in this application embodiment is not specifically limited, as long as it satisfies the requirement that the polymerizable liquid crystal monomers undergo a polymerization reaction, such as ultraviolet light irradiation stimulation. (Specific details to be added later.) Figure 4 The diagram shown illustrates an encryption principle according to an embodiment of this application. Using a panda encryption pattern as an example and coumarin 6 as the first fluorescent dye, the encryption is explained. Without applying voltage to the first electrode 121 and the second electrode 122, the optical component 10 is stimulated by ultraviolet light irradiation based on the encryption mask 21 with the panda perforated pattern. This causes the polymerizable liquid crystal monomers at the corresponding locations on the optical component 10 to polymerize, forming a solid liquid crystal polymer, thus completing the encryption process. (Continue referring to...) Figure 4 As shown, since polymerizable liquid crystal monomers polymerize into solid liquid crystal polymers when irradiated with ultraviolet light, when a voltage (Power On) is applied to the first electrode 121 and the second electrode 122 of the optical component 10, the solid liquid crystal polymer at the location corresponding to the panda encryption pattern of the optical component 10 does not twist in the electric field. When the first fluorescent dye is excited and produces green fluorescence, the circularly polarized emission at the location corresponding to the panda encryption pattern of the optical component 10 is different from the circularly polarized emission at other locations, thus displaying the panda encryption pattern. At this time, no encryption pattern is displayed when observed with a right-hand circularly polarized filter (R-CPF), and the panda encryption pattern is more clearly displayed when observed with a left-hand circularly polarized filter (L-CPF). Furthermore, when no voltage is applied to the first electrode 121 and the second electrode 122 of the optical component 10, and the first fluorescent dye is excited to produce green fluorescence, the circularly polarized emission at the location corresponding to the panda encryption pattern of the optical component 10 is the same as the circularly polarized emission at other locations, thus the panda encryption pattern cannot be displayed; at this time, the panda encryption pattern will not be displayed under ideal conditions, whether observed with a right-hand circularly polarized filter (R-CPF) or a left-hand circularly polarized filter (L-CPF).

[0060] Figure 4This illustration demonstrates the principle of ultraviolet light irradiation encryption of the optical component 10 when no voltage is applied to the first electrode 121 and the second electrode 122. In some embodiments, this application embodiment can also perform stimulation encryption on the optical component 10 when a voltage is applied to the first electrode 121 and the second electrode 122; that is, the optical component 10 further includes polymerizable liquid crystal monomers doped in the positive nematic liquid crystal layer 140, wherein the encryption method includes: applying a preset voltage to the first electrode 121 and the second electrode 122; stimulating the optical component 10 based on an encryption mask, causing the polymerizable liquid crystal monomers of the optical component 10 at the encryption pattern to polymerize into a solid liquid crystal polymer, wherein the encryption pattern is a cutout pattern of the encryption mask. (Specifically combined with...) Figure 5 The diagram shown illustrates another encryption principle provided in this application embodiment. Taking a butterfly encryption pattern as an example, and using coumarin 6 as the first fluorescent dye and RM257 as the polymerizable liquid crystal monomer, the encryption process is explained. First, a preset voltage is applied to the first electrode 121 and the second electrode 122 of the optical component 10. Then, after the long axis of the liquid crystal in the optical component 10 is parallel to the vertical electric field, the optical component 10 is stimulated by ultraviolet light irradiation based on the encryption mask 22 with the butterfly hollow pattern. This causes the polymerizable liquid crystal monomers at the butterfly hollow pattern location on the optical component 10 to polymerize and form a solid liquid crystal polymer, thereby completing the encryption process. (Continue referring to...) Figure 5 As shown, since polymerizable liquid crystal monomers polymerize into solid liquid crystal polymers when irradiated with ultraviolet light, when no voltage is applied to the first electrode 121 and the second electrode 122 of the optical component 10 (Power Off), the solid liquid crystal polymer at the location of the butterfly encryption pattern of the optical component 10 cannot be restored. When the first fluorescent dye is excited and produces green fluorescence, the circularly polarized emission at the location of the butterfly encryption pattern of the optical component 10 is different from the circularly polarized emission at other locations, thus displaying the butterfly encryption pattern. At this time, no encryption pattern is displayed when observed with a right-hand circularly polarized filter (R-CPF), and the butterfly encryption pattern is more clearly displayed when observed with a left-hand circularly polarized filter (L-CPF). Furthermore, when a voltage (Power On) is applied to the first electrode 121 and the second electrode 122 of the optical component 10, and the first fluorescent dye is excited to produce green fluorescence, the circularly polarized emission at the location corresponding to the butterfly encryption pattern of the optical component 10 is the same as the circularly polarized emission at other locations, thus the butterfly encryption pattern cannot be displayed; at this time, the butterfly encryption pattern is not displayed under ideal conditions whether observed with a right-hand circularly polarized filter (R-CPF) or a left-hand circularly polarized filter (L-CPF).

[0061] In some embodiments, the encryption pattern provided in this application can be any regular or irregular pattern such as text, numbers, letters, or graphics, and this application does not impose specific limitations on it. For example, in some embodiments, the encryption pattern can be ASCII code and Chinese character information, etc.

[0062] It is understood that the embodiments provided in this application... Figure 4 and Figure 5 This illustration demonstrates the encryption principle of the positive nematic liquid crystal layer 140 of the optical component 10 when it is doped with polymerizable liquid crystal monomers, namely, the patterned encryption principle of electro-response and photopolymerization response. In the field of 3D display, electro-response modulation technology has brought innovative applications to the circularly polarized light emission characteristics. Based on the electro-optic effect of positive nematic liquid crystal materials, by precisely applying voltage to the first electrode 121 and the second electrode 122, the orientation state of the liquid crystal molecules can be effectively changed, thereby achieving reversible modulation of the intensity of the circularly polarized light emission signal, providing a powerful means for optimizing the 3D display effect. For example, when a specific 40V and 1kHz sinusoidal voltage is applied to the first electrode 121 and the second electrode 122, the liquid crystal molecules will quickly align vertically. This orientation change breaks the original twisted stacking structure of the liquid crystal molecules, causing the intensity of the circularly polarized light emission signal to be significantly weakened. Once the voltage applied to the first electrode 121 and the second electrode 122 is removed, the liquid crystal molecules can quickly return to the initial orientation due to their own characteristics, and the circularly polarized light emission performance is perfectly restored. After multiple cyclic tests, this process has been verified to be not only stable and reliable, but also exhibits no energy decay, ensuring continuity and stability in 3D display applications. Of particular note is the ability to fix the orientation of polymerizable liquid crystal monomers using voltage-assisted photopolymerization technology, combined with the unique process of mask lithography, to achieve "negative etching" (…). Figure 4 The schematic diagram illustrates the encryption method of optical component 10 based on a mask and the positive etching method. Figure 5 The illustration demonstrates the encryption effect of a mask-based method for optical components 10, thereby creating highly programmable encryption patterns. Complex encryption patterns, such as lifelike "pandas" and "butterflies," are accurately presented. These encryption patterns exhibit rich and varied visual effects under different electric field intensities and polarized light conditions. In 3D display scenarios, this characteristic greatly enhances the dimension of information encryption, providing viewers with a more immersive and personalized 3D visual experience. It effectively improves the security and interactivity of 3D displays, opening up new paths for the future development of 3D display technology.

[0063] Based on the same inventive concept, this application also provides an encryption method applied to the optical encryption device provided in any of the above embodiments. The optical component 10 further includes a second fluorescent dye doped in the positive nematic liquid crystal layer 140. The encryption method includes: stimulating the optical component 10 based on a first encryption mask, causing the optical component 10 to achieve fluorescence resonance energy transfer between the first fluorescent dye and the second fluorescent dye at a first encryption pattern, wherein the first encryption pattern is a cutout pattern of the first encryption mask. It should be noted that the stimulation method of the optical component 10 provided in this application embodiment is not specifically limited, as long as it satisfies the requirement of achieving fluorescence resonance energy transfer between the first fluorescent dye and the second fluorescent dye, such as ultraviolet light irradiation stimulation. (Specific details to be added later.) Figure 6 The diagram illustrates another encryption principle provided in this application embodiment. Taking the letter A as an example of the first encryption pattern, and using coumarin 6 as the first fluorescent dye and spiropyran as the second fluorescent dye, the encryption is explained. In this embodiment, a photoresponsive system is constructed by introducing a 1,3,3-trimethylindoline-6'-nitrobenzopyran spirocyclic chromophore into the positive nematic liquid crystal layer 140. Based on the fluorescence resonance energy transfer (FRET) principle, under ultraviolet light irradiation, spiropyran transitions from a closed-ring state to an open-ring state (MC form), triggering a redshift in the circularly polarized emission wavelength and a chiral inversion. Therefore, the encryption method provided in this application embodiment is as follows: Optical component 10 is irradiated with ultraviolet light using a first encryption mask with a letter A cutout pattern, causing the optical component 10 to achieve fluorescence resonance energy transfer between the first and second fluorescent dyes at the letter A encryption pattern, completing the encryption writing process of the letter A. When the fluorescent dye is excited and produces fluorescence, the letter A encryption pattern area exhibits red fluorescence, while the area outside the letter A encryption pattern exhibits green fluorescence.

[0064] Furthermore, the first encryption pattern provided in this application embodiment can also be erased, and then a new encryption pattern can be written. That is, the encryption method further includes: controlling the second fluorescent dye at the first encryption pattern of the optical component 10 to become ineffective; stimulating the optical component 10 based on the second encryption mask, causing the optical component 10 to achieve fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the second encryption pattern, wherein the second encryption pattern is a cutout pattern of the second encryption mask. (Continue to refer to...) Figure 6As shown, firstly, the second fluorescent dye at the encrypted letter A pattern is deactivated. In some embodiments, continuous ultraviolet light irradiation, visible light irradiation, or heating can be used to deactivate the second fluorescent dye at the encrypted letter A pattern, thereby completing the erasure operation of the encrypted letter A pattern. Then, the optical component 10 is stimulated by ultraviolet light irradiation based on the second encryption mask with a QR code cutout pattern, so that the optical component 10 realizes fluorescence resonance energy transfer of the first and second fluorescent dyes at the QR code encryption pattern, completing the writing process of the QR code encryption pattern. When the fluorescent dye is excited and produces fluorescence, the QR code encryption pattern area is red fluorescent, while the area outside the QR code encryption pattern is green fluorescent. In addition, the display effect of the QR code encryption pattern under observation with a right-hand circular polarization filter (R-CPF) is different from that under observation with a left-hand circular polarization filter (L-CPF). The QR code encryption pattern is displayed more clearly under observation with a left-hand circular polarization filter (L-CPF), based on which the decryption display of the encryption pattern can be realized.

[0065] It is understood that the embodiments provided in this application... Figure 6 This illustration demonstrates the encryption principle when a second fluorescent dye is doped into the positive nematic liquid crystal layer 140 of the optical component 10, namely, the photoresponsive patterning encryption principle. In 3D display applications, photoresponsive patterning technology shows great potential. By utilizing the photoresponsive characteristics of materials, combined with photomask lithography and thermal and optical processing methods, erasable and reprogrammable circularly polarized luminescent patterns can be achieved. Taking specific patterns as examples, such as encrypted patterns of the letter A and QR codes, these erasable patterns can serve as important elements for information encryption in 3D display scenarios. By reading these patterns with different polarized light, the encryption and decryption processes of information in 3D displays can be realized, greatly improving the information security and encryption level of 3D display content. Figure 6 As described above, the encryption pattern is written using 365nm ultraviolet light, and then erased using continuous ultraviolet light irradiation, heating, or visible light irradiation. A new pattern can then be written again using 365nm ultraviolet light, such as transforming a simple letter A encryption pattern into a QR code encryption pattern. In 3D display applications, this flexibly programmable circularly polarized light emission pattern can be used to present diverse 3D visual effects, such as displaying different 3D scenes or objects using different polarized light, bringing a richer and more secure visual experience to 3D displays.

[0066] Based on the same inventive concept, this application also provides an encryption method applied to the optical encryption device provided in any of the above embodiments. The optical component 10 further includes polymerizable liquid crystal monomers and a second fluorescent dye doped in the positive nematic liquid crystal layer. The encryption method includes: stimulating the optical component 10 based on a third encryption mask 23, causing the polymerizable liquid crystal monomers of the optical component 10 at the third encryption pattern to polymerize into a solid liquid crystal polymer, and simultaneously causing the optical component 10 to achieve fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the third encryption pattern. The third encryption pattern includes a polymerization region 231 and a first encryption portion 232, and the third encryption pattern 23 is a cutout pattern of the third encryption mask. A preset voltage is applied to the first electrode 121 and the second electrode 122. Stimulating the optical component 10 based on the fourth encryption mask 24 causes the polymerizable liquid crystal monomers of the optical component 10 at the second encryption portion 233 of the polymerization region 231 to polymerize into a solid liquid crystal polymer, while simultaneously controlling the second fluorescent dye of the optical component 10 at the second encryption portion 233 to become inactive. Specifically, in conjunction with... Figure 7The diagram shown illustrates another encryption principle provided in this application embodiment. Taking the combination of the first encryption part 232 and the second encryption part 233 into a butterfly encryption pattern as an example, and using coumarin 6 as the first fluorescent dye, spiropyran as the second fluorescent dye, and RM257 as the polymerizable liquid crystal monomer as an example, the encryption is explained. First, without applying voltage to the first electrode 121 and the second electrode 122, the optical component 10 is stimulated with 365nm ultraviolet light based on the third encryption mask 23, which has a corresponding openwork pattern of the polymerization region 231 and the first encryption part 232. This causes the optical component 10 to achieve fluorescence resonance energy transfer between the first and second fluorescent dyes at the polymerization region 231 and the first encryption part 232 (the right half of the butterfly encryption pattern 232 in the diagram). Simultaneously, the polymerizable liquid crystal monomer polymerizes to form a solid liquid crystal polymer. At this time, when the fluorescent dye is excited and produces fluorescence, the polymerization region 231 and the first encryption part 232 exhibit red fluorescence, while the remaining portion exhibits green fluorescence. After applying a preset voltage to the first electrode 121 and the second electrode 122, the optical component 10 is stimulated by 365nm ultraviolet light irradiation based on the fourth encryption mask 24 with a corresponding hollow pattern of the second encryption part 233. This causes the polymerizable liquid crystal monomers at the second encryption part 233 (the left half of the butterfly encryption pattern 233 in the figure) of the polymerization region 231 of the optical component 10 to polymerize into a solid liquid crystal polymer. At the same time, the second fluorescent dye at the second encryption part 233 of the optical component 10 is deactivated. At this time, when the fluorescent dye is excited and produces fluorescence, the area of ​​the polymerization region 231 other than the second encryption part 233 and the first encryption part 232 are red fluorescent, while the rest, including the second encryption part 233, are green fluorescent. Figure 7 The fluorescent display pattern in the middle is used to complete the encrypted writing of the optical component 10.

[0067] Furthermore, in completing such Figure 7 After the encrypted writing of the fluorescent display pattern in section ①, the encrypted pattern can be deformed in more ways. In some embodiments, after stimulating the optical component 10 based on the fourth encryption mask 24, the encryption method further includes: controlling the second fluorescent dye of the optical component 10 to become inactive. Continuing as... Figure 7 As shown, in this embodiment of the application, the second fluorescent dye in the polymerization region 231 (excluding the second encryption part 233) and the first encryption part 232 can be deactivated by continuous ultraviolet light irradiation, visible light irradiation, or heating. In this case, the encryption method is changed from... Figure 7 Transformation of ① into Figure 7②. It is understandable that the polymerizable liquid crystal monomers corresponding to the second encryption section 233 are polymerized when a voltage is applied to the liquid crystal cell 100 (i.e., a preset voltage is applied to the first electrode 121 and the second electrode 122), while the polymerizable liquid crystal monomers corresponding to the area outside the second encryption section 233 in the polymerization region 231 and the first encryption section 232 are polymerized when no voltage is applied to the liquid crystal cell 100. Therefore, when the fluorescent dye is excited and generates fluorescence, and no voltage is applied to the first electrode 121 and the second electrode 122 (Power Off), the encryption pattern of the second encryption section 233 is displayed, such as... Figure 7 The fluorescent display pattern in section ② (left half of the butterfly encryption pattern 233); when the fluorescent dye is excited and produces fluorescence, and a voltage (Power On) is applied to the first electrode 121 and the second electrode 122, the encryption pattern of the first encryption section 232 will be displayed, such as Figure 7 The fluorescent display pattern in ③ (the right half of the butterfly encryption pattern 232).

[0068] Optionally, in the technical solution provided in this application embodiment, after the second fluorescent dye of the controlled optical component 10 is deactivated, the encryption method further includes: stimulating the optical component 10 based on a fifth encryption mask, so that the optical component 10 achieves fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the aggregation region 231 and the first encryption region 232 outside the second encryption region 233, wherein the fifth encryption mask has a hollow pattern corresponding to the aggregation region 231 and the first encryption region 232 outside the second encryption region 233. (Continue to refer to...) Figure 7 As shown, an optical component 10 is stimulated with ultraviolet light based on a fifth encryption mask with a hollowed-out pattern having a polymerization region 231 (excluding the second encryption part 233) and a first encryption part 232. This causes the optical component 10 to achieve fluorescence resonance energy transfer between the first and second fluorescent dyes in the polymerization region 231 (excluding the second encryption part 233) and the first encryption part 232, thereby realizing... Figure 7 The fluorescent display pattern in section ② is shown. Figure 7 The restoration of the fluorescent display pattern in ① enables flexible encryption control and improves the encryption effect.

[0069] In summary, this application provides an optical component, an optical encryption device, and an encryption method. The optical component includes: a liquid crystal cell, which includes: a sealed housing; a first electrode and a second electrode, the first electrode and the second electrode being located within the sealed housing and disposed opposite to each other; a first alignment film and a second alignment film, the first alignment film being located on the side of the first electrode facing the second electrode, and the second alignment film being located on the side of the second electrode facing the first electrode, and the first alignment film and the second alignment film having the same orientation direction; a positive liquid crystal layer, the positive nematic liquid crystal layer being located between the first alignment film and the second alignment film, and the positive nematic liquid crystal layer being doped with a first fluorescent dye and a photoinitiator; and a phase retardation sheet, the phase retardation sheet covering the surface of the liquid crystal cell on the side of the first electrode, the stretching direction of the phase retardation sheet forming an angle of -90° to +90° with the orientation direction of the first alignment film.

[0070] As can be seen from the above, the technical solution provided in this application uses a liquid crystal cell based on a positive nematic liquid crystal layer and a phase retardation film stacked together to form optical components. By precisely controlling the stacking angle of the stretching direction of the phase retardation film and the orientation direction of the alignment film, a twisted stacking structure is constructed, thereby building a high-g structure. lum And a high FOM value system. The liquid crystal cell is composed of a positive nematic liquid crystal layer, a doped first fluorescent dye, and a photoinitiator. This allows for arbitrary shape and pattern design of the liquid crystal cell, and it also provides excellent linearly polarized light emission. Furthermore, multi-response properties are achieved by modulating the liquid crystal through the electric fields of the first and second electrodes. Therefore, the optical components provided in this application embodiment possess high g-value. lum It features high FOM value, multi-response capability, and arbitrary patterning ability. Furthermore, the optical encryption device provided in this application is fabricated based on optical components. Since the optical encryption device includes polymerizable liquid crystal monomers and / or a second fluorescent dye doped in a positive nematic liquid crystal layer, the circularly polarized light emitted by the optical components can be modulated by various external stimuli. This allows for the design of various encryption methods for the optical encryption device, meeting application requirements in fields such as multidimensional data encoding, advanced anti-counterfeiting, and information encryption.

[0071] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In the embodiments of this application, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0074] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In the embodiments of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An optical component, characterized in that, include: A liquid crystal cell, comprising: a sealed housing; a first electrode and a second electrode, the first electrode and the second electrode being located within the sealed housing and disposed opposite to each other; a first alignment film and a second alignment film, the first alignment film being located on the side of the first electrode facing the second electrode, and the second alignment film being located on the side of the second electrode facing the first electrode, and the first alignment film and the second alignment film having the same orientation direction; and a positive nematic liquid crystal layer, the positive nematic liquid crystal layer being located between the first alignment film and the second alignment film, and the positive nematic liquid crystal layer being doped with a first fluorescent dye and a photoinitiator; A phase retardation film covers the surface of the liquid crystal cell on the first electrode side, and the stretching direction of the phase retardation film forms an angle of -90° to +90° with the orientation direction of the first alignment film.

2. The optical component according to claim 1, characterized in that, The material of the positive nematic liquid crystal layer includes at least one of E7, 5CB, 6CB, and 8CB; And / or, the first fluorescent dye includes at least one of coumarin 6, rubrene, 9,10-dimethylanthracene, and Nile red; And / or, the photoinitiator includes at least one of I-651 and I-1173; And / or, the material of the phase delay film includes at least one of PVA, PE, PET, and D4.

3. The optical component according to claim 1, characterized in that, The doping concentration of the first fluorescent dye is 0.01 to 50.25 wt%.

4. An optical encryption device, characterized in that, include: At least one optical component according to any one of claims 1-3, the optical component further comprising polymerizable liquid crystal monomers and / or a second fluorescent dye doped in the positive nematic liquid crystal layer, wherein the first fluorescent dye and the second fluorescent dye satisfy the fluorescence resonance energy transfer condition.

5. The optical encryption device according to claim 4, characterized in that, The polymerizable liquid crystal monomer includes at least one of RM257, RM82, and LC756; And / or, the second fluorescent dye comprises spiropyran.

6. An encryption method, characterized in that, The optical encryption device according to claim 4 or 5 further includes polymerizable liquid crystal monomers doped in the positive nematic liquid crystal layer, wherein the encryption method includes: The optical components are stimulated by the encryption mask, causing the polymerizable liquid crystal monomers of the optical components at the encryption pattern to polymerize into solid liquid crystal polymers, wherein the encryption pattern is a cutout pattern of the encryption mask. Alternatively, the encryption method includes: A preset voltage is applied to the first electrode and the second electrode; Stimulating the optical components based on the encryption mask causes the polymerizable liquid crystal monomers of the optical components at the encryption pattern to polymerize into a solid liquid crystal polymer, wherein the encryption pattern is a cutout pattern of the encryption mask.

7. An encryption method, characterized in that, The optical encryption device according to claim 4 or 5 further includes a second fluorescent dye doped in the positive nematic liquid crystal layer, wherein the encryption method includes: The optical component is stimulated based on the first encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the first encryption pattern, wherein the first encryption pattern is a hollow pattern of the first encryption mask.

8. The encryption method according to claim 7, characterized in that, The encryption method further includes: The second fluorescent dye at the first encryption pattern is deactivated by controlling the optical component. The optical component is stimulated by the second encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the second encryption pattern, wherein the second encryption pattern is a hollow pattern of the second encryption mask.

9. An encryption method, characterized in that, The optical encryption device according to claim 4 or 5 further includes polymerizable liquid crystal monomers and a second fluorescent dye doped in the positive nematic liquid crystal layer, wherein the encryption method includes: Stimulating the optical component based on the third encryption mask causes the polymerizable liquid crystal monomers of the optical component at the third encryption pattern to polymerize into a solid liquid crystal polymer. At the same time, the optical component achieves fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye at the third encryption pattern. The third encryption pattern includes a polymerization region and a first encryption part. The third encryption pattern is a cutout pattern of the third encryption mask. A preset voltage is applied to the first electrode and the second electrode; The optical component is stimulated by the fourth encryption mask, causing the polymerizable liquid crystal monomers of the optical component at the second encryption part of the polymerization region to polymerize into a solid liquid crystal polymer, while controlling the second fluorescent dye of the optical component at the second encryption part to become ineffective.

10. The encryption method according to claim 9, characterized in that, After stimulating the optical component based on the fourth encryption mask, the encryption method further includes: controlling the second fluorescent dye of the optical component to become ineffective; Optionally, after the second fluorescent dye controlling the optical component fails, the encryption method further includes: The optical component is stimulated by the fifth encryption mask, so that the optical component realizes fluorescence resonance energy transfer of the first fluorescent dye and the second fluorescent dye in the aggregation region outside the second encryption part and the first encryption part. The fifth encryption mask has a hollow pattern corresponding to the aggregation region outside the second encryption part and the first encryption part.

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