Flexible 3D display and preparation method thereof

Abstract

The invention discloses a flexible 3D display and a preparation method thereof, and belongs to the technical field of circular polarization luminescent materials. The flexible 3D display comprises a flexible substrate, a first conductive layer, an electroluminescent layer, a second conductive layer and a circularly polarized light conversion layer which are connected in sequence, the circularly polarized light conversion layer is prepared by mixing macroscopic co-assembly capability molecules, an organic chiral dopant, an oil-water amphiphilic substance and a polyacrylamide prepolymer and reacting under heating and ultraviolet irradiation. According to the flexible 3D display, the circularly polarized light conversion layer and the electroluminescent part are combined, the light-emitting asymmetry factor of the circularly polarized light-emitting material is improved, meanwhile, the adopted polyacrylamide prepolymer retains the advantages of high flexibility, high transparency, electrically controllable pattern display and the like on the premise of keeping the chiral liquid crystal macroscopic spiral structure, and the display effect is good. The non-polarized light of the electroluminescent part can be converted into circularly polarized light with a high asymmetric factor, and finally the flexible 3D display is stable in structure and excellent in optical performance.

Description

Technical Field

[0001] The present invention relates to the technical field of circularly polarized luminescence materials, and particularly to a flexible 3D display and a preparation method thereof. Background Art

[0002] With the rapid development of display technology, people's demand for display devices is also increasing continuously. Although traditional flat panel displays can provide high-quality images, they cannot provide a real 3D experience. To solve this problem, researchers and engineers have begun to study flexible 3D displays, which can provide a more natural visual experience and a more flexible display method. In recent years, with the progress of flexible display technology, the research on flexible 3D displays has begun to develop rapidly.

[0003] Chiral luminescence, also known as Circularly Polarized Luminescence (CPL), refers to the phenomenon that after a chiral luminescence system is excited, the emitted light has different left-handed and right-handed circularly polarized lights. Due to the unique properties of circularly polarized light, it can be transmitted through a polarizer with the same polarization direction and blocked by a polarizer with the opposite polarization direction, so that it has a very broad application prospect in the field of 3D display based on binocular parallax.

[0004] Currently, there are mainly two factors restricting the application of circularly polarized light in the field of flexible 3D display. The first is the asymmetry factor g of circularly polarized light in the energized state. lum It is defined as: g lum = 2(I L - I R ) / (I L + I R ), where I L and I R are the emission intensities of left-handed circularly polarized light and right-handed circularly polarized light in the total light intensity of the luminescence system respectively. From the expression, it can be seen that the value range of g lum is from -2 to +2. The magnitude of the g lum value determines the magnitude of the parallax formed in the two eyes, and further determines the possibility of the circularly polarized luminescence material being applied to 3D display. In the current field of circularly polarized luminescence, the systems with high asymmetry factors realized are basically photoluminescence material systems, and the patterns shown are basically static, and real-time electro-controlled pattern changes cannot be achieved. The asymmetry factors of electrochemically induced circularly polarized luminescence material systems are generally lower than 10 -2 , which cannot meet the requirements of practical applications. Therefore, the research and development of a circularly polarized luminescence system that can be electro-controlled in pattern and maintain a high asymmetry factor is extremely urgent.

[0005] The second key parameter is the overall flexibility of the device. Flexibility brings revolutionary changes to displays, providing new display modes such as bending, folding, and unfolding. Such display modes can increase the flexibility and interactivity of the display, creating new user experiences. They can also provide a larger display area in a limited space, such as in wearable devices, smartphones, and tablets. This design can save space and increase portability. However, there are still many problems to be solved in obtaining a display with High display high resolution, high flexible durability, and high 3D display effect.

[0006] Currently, liquid crystals with macroscopic co-assembly ability can exhibit a helical stacking structure, which can significantly increase the value of the luminescence asymmetry factor g lum value. By adjusting the pitch of the chiral liquid crystal and changing the position of the photonic bandgap of the chiral liquid crystal, the chiral liquid crystal has a strong selective reflection for light of a specific wavelength, thereby obtaining a specific circularly polarized light. There are still some deficiencies in the reported chiral liquid crystal materials at present. Most of the reported systems are still in the stage of photoluminescence, unable to achieve real-time changes to the displayed pattern through electrical signals, and usually require a rigid liquid crystal cell as a carrier, unable to achieve flexible functions, which greatly limits the development of flexible 3D displays based on circularly polarized light.

[0007] Therefore, it is of great significance to research and develop a new type of self-positioning flexible circularly polarized luminescent material with a relatively high value of the luminescence asymmetry factor g lum value. Summary of the Invention

[0008] In view of this, the technical problem to be solved by the present invention is to provide a flexible 3D display and a preparation method thereof. The flexible 3D display has a relatively high asymmetry factor, good flexibility, high transparency, and an electrically controllable display pattern.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] The present invention provides a flexible 3D display, including a flexible substrate, a first conductive layer, an electroluminescent layer, a second conductive layer, and a circularly polarized light conversion layer connected in sequence;

[0011] The circularly polarized light conversion layer is prepared by mixing molecules with macroscopic co-assembly ability, an organic chiral dopant, an oil-water amphiphilic substance, and a polyacrylamide prepolymer, and reacting under heating and ultraviolet light irradiation.

[0012] The circularly polarized light conversion layer of the flexible 3D display described in the present invention has a uniform chiral functional part, which can convert the unpolarized light emitted by the electroluminescent part (referring to the first conductive layer, the electroluminescent layer, and the second conductive layer) into circularly polarized light, thereby obtaining a flexible 3D display based on circularly polarized light. By splitting the electroluminescent layer and the chiral functional part, the present invention realizes the acquisition of circularly polarized light with a high dissymmetry factor under the condition of being powered on. Moreover, the chiral functional part has a large surface tension difference on the hydrophilic and hydrophobic surfaces, which enables its self-positioning and greatly reduces the processing difficulty.

[0013] In addition, all materials used in the present invention are flexible materials, so that the prepared 3D display has a certain degree of flexibility and can be bent, curled, etc.

[0014] The emission peak of the electroluminescent layer is preferably 400 - 600 nm; more preferably 510 nm.

[0015] The emission intensity of the electroluminescent layer is preferably 30 - 100 cd / m 2 ; more preferably 50 cd / m 2 .

[0016] The excitation power supply of the electroluminescent material is preferably alternating current.

[0017] Preferably, the electroluminescent layer of the present invention is selected from ZnS:Cu phosphor or ZnS:Mn phosphor;

[0018] The present invention has no special limitation on the doping ratio of copper in the ZnS:Cu phosphor or the doping ratio of manganese in the ZnS:Mn phosphor, and it can be adjusted according to different emission color requirements.

[0019] Preferably, the first conductive layer and the second conductive layer are independently selected from one or more of gold, silver, copper, and PEDOT:PSS.

[0020] Preferably, the flexible substrate is selected from one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyvinyl chloride (PVC), chlorinated polyethylene (CPE), chlorosulfonated polyethylene (CSPE), plasticized polyolefin (ELPO), ethylene-propylene rubber (EPDM), chloroprene rubber (CBR), butene rubber (PBR), thermoplastic synthetic rubber, epichlorohydrin rubber, and polyethylene terephthalate (PET).

[0021] Preferably, the macro co-assembly capable molecules are selected from one or more of 4'-n-pentyl-4-cyanobiphenyl (5CB), 4'-n-pentyloxy-4-cyanobiphenyl (5OCB), 4'-n-heptyl-4-cyanobiphenyl (7CB), 4'-n-octyloxy-4-cyanobiphenyl (8OCB), 4'-n-pentyl-4-cyanoterphenyl (5CT), and liquid crystal E7; more preferably 5CB, 5CT, or liquid crystal E7.

[0022] Preferably, the organic chiral dopants are selected from one or more of S811, R811, S5011, and R5011; more preferably S811 and / or R811, or S5011 and / or R5011; further preferably S811 and R811, or S5011 and R5011. Among them, the structures of chiral dopants S811 or R811 are as follows:

[0023]

[0024] The structures of chiral dopants S5011 or R5011 are as follows:

[0025]

[0026] The mass ratio of the oil-water amphiphilic substance to the polyacrylamide prepolymer is preferably (5 - 10):(80 - 90).

[0027] Preferably, the oil-water amphiphilic substance is selected from polyvinyl alcohol (PVA).

[0028] In the present invention, the PVA wraps the chiral liquid crystal system (CLCs) to form microspheres, and the microspheres are dispersed in the polyacrylamide polymer to form the circularly polarized light conversion layer.

[0029] Preferably, the flexible 3D display includes a PET substrate, a PEDOT:PSS layer, a ZnS:Cu phosphor layer, a PEDOT:PSS layer, and a circularly polarized light conversion layer connected in sequence;

[0030] Preferably, the circularly polarized light conversion layer is prepared by mixing liquid crystal E7, organic chiral dopants S5011 and R5011, polyacrylamide prepolymer, and an aqueous solution of polyvinyl alcohol, and reacting under heating and ultraviolet light irradiation.

[0031] The present invention also provides a preparation method of the above flexible 3D display, including the following steps:

[0032] (1) Coat a conductive layer, an electroluminescent layer, and a conductive layer on the surface of the flexible substrate in sequence to obtain material S1;

[0033] (2) Mix the macro co-assembly capable molecules, organic chiral dopants, oil-water amphiphilic substances and polyacrylamide prepolymer, and then coat the mixture on the surface of the material S1 obtained in step (1). React under heating and ultraviolet light irradiation to prepare the flexible 3D display.

[0034] In the preparation method of the present invention, the flexible chiral part that can convert unpolarized light into high-quality circularly polarized light is prepared by the macro co-assembly capable molecules, organic chiral dopants, oil-water amphiphilic substances and polyacrylamide prepolymer, which is the circularly polarized light conversion layer.

[0035] Preferably, the mass ratio of the macro co-assembly capable molecules to the organic chiral dopants is (5 - 10):(0.1 - 0.2);

[0036] Preferably, the mass ratio of the macro co-assembly capable molecules to the polyacrylamide prepolymer is (5 - 10):(50 - 90).

[0037] Preferably, the heating temperature is 25°C - 40°C;

[0038] Preferably, the wavelength of the ultraviolet light for ultraviolet light irradiation is 300 - 370 nm.

[0039] Preferably, the light transmittance of the polyacrylamide prepolymer of the present invention is 85% - 99%; more preferably 95%.

[0040] The polymerization-induced light source wavelength of the polyacrylamide prepolymer is preferably 300 - 370 nm; more preferably 365 nm.

[0041] The flexible bendable angle of the polyacrylamide prepolymer is preferably 120° - 360°.

[0042] The present invention does not make special limitations on the preparation method of the above polyacrylamide prepolymer, and it can be a method well-known to those skilled in the art such as the solvothermal synthesis method.

[0043] Compared with the prior art, the flexible 3D display provided by the present invention includes a flexible substrate, a first conductive layer, an electroluminescent layer, a second conductive layer, and a circularly polarized light conversion layer connected in sequence; the circularly polarized light conversion layer is prepared by mixing a macroscopically co-assembled ability molecule, an organic chiral dopant, an oil-water amphiphilic substance, and a polyacrylamide prepolymer and reacting under heating and ultraviolet light irradiation. The flexible 3D display combines the circularly polarized light conversion layer with the electroluminescent part, improving the luminescence asymmetry factor of the circularly polarized light-emitting material. At the same time, the polyacrylamide prepolymer used retains the advantages of high flexibility, high transparency, and electrically controllable display patterns while maintaining the macroscopic helical structure of the chiral liquid crystal, enabling the non-polarized light of the electroluminescent part to be converted into circularly polarized light with a high asymmetry factor. Finally, the flexible 3D display has a stable structure and excellent optical performance. Description of the Drawings

[0044] Figure 1 A real-shot picture of the self-positioning flexible 3D display based on circularly polarized light prepared in Example 1;

[0045] Figure 2 Real-shot pictures of the self-positioning flexible 3D displays based on circularly polarized light prepared in Examples 1-5 respectively;

[0046] Figure 3 Schematic internal structure diagrams of the self-positioning flexible 3D displays based on circularly polarized light prepared in Examples 1-5;

[0047] Figure 4 CD spectrum of the self-positioning flexible circularly polarized light conversion film layer prepared in Example 1;

[0048] Figure 5 CPL and g of the self-positioning flexible circularly polarized light conversion film layer prepared in Example 1 lum Spectrum diagram;

[0049] Figure 6 SEM cross-sectional view of the flexible 3D display based on circularly polarized light prepared in Example 1;

[0050] Figure 7 Depth information achieved by the flexible 3D display based on circularly polarized light prepared in Example 1, where a is a photo taken by a depth camera without polarized glasses, b is a photo taken by a depth camera through polarized glasses, c is the data mapping corresponding to a, and d is the data mapping corresponding to b. Detailed Description of the Invention

[0051] To further illustrate the present invention, the flexible 3D display provided by the present invention and its preparation method will be described in detail below in conjunction with examples.

[0052] The following examples select a flexible substrate PET film, a transparent conductive layer PEDOT:PSS, ZnS:Cu phosphor dispersed in TPU, a polyacrylamide prepolymer, a molecule with macroscopic co-assembly ability: E7, chiral dopants R5011 and S5011, and an amphiphilic substance PVA as typical representatives for illustration as examples.

[0053] Example 1

[0054] A template with a spacing of 2 mm was closely bonded to the PET substrate. The PEDOT:PSS solution was sprayed onto the template at a speed of 5 mm / S using a spray gun. After drying with hot air at 40 °C, a 2-mm-wide conductive line 1 was formed. Then, a layer of ZnS:Cu phosphor (20 wt%) dispersed in TPU was printed on this surface using a microelectronic printer, placed in an oven at 70 °C for 5 h to fully form. Subsequently, a conductive line 2 orthogonal to the conductive line 1 was printed on the surface again using the template method, and a 2-mm × 2-mm light-emitting pixel was formed at the intersection to obtain an electroluminescent device.

[0055] In a light-shielded open sample bottle, organic chiral dopant S5011 (about 0.023 g) and liquid crystal E7 with macroscopic co-assembly ability (about 0.977 g) were successively added. After ultrasonic treatment for an appropriate time to completely mix each component to form a uniform and transparent solution, the sample was placed in a vacuum drying oven, and the solvent was slowly evaporated at an appropriate temperature for a certain time to obtain a chiral liquid crystal system (CLCs). Finally, it was cooled to room temperature for later use.

[0056] The preparation process of the above chiral liquid crystal system is the same, except that about 0.023 g of organic chiral dopant R5011 was added to the light-shielded open sample bottle.

[0057] 5.00 g of the prepared polyacrylamide prepolymer and 2.00 g of a PVA aqueous solution (10%) were respectively added to the above two light-shielded open sample bottles. The mixture was stirred at a speed of 10000 rpm for 5 min using a homogenizer. The obtained homogeneous mixtures with different chirality were alternately printed onto the upper surface of the above-prepared electroluminescent device by a microelectronic printer. While heating to 30 °C, it was irradiated with a 365-nm light source for 5 min. Finally, a self-positioning flexible 3D display based on circularly polarized light could be obtained. The actual picture is as Figure 1 shown; Figure 4 is the CD spectrogram of the self-positioning flexible circularly polarized light conversion film layer prepared in Example 1; Figure 5 is the CPL and g lum spectrogram of the self-positioning flexible circularly polarized light conversion film layer prepared in Example 1; Figure 6 is the side-sectional SEM image of the flexible 3D display based on circularly polarized light prepared in Example 1, and the function description of the layer is on the right; Figure 7Depth information achieved by the flexible 3D display based on circularly polarized light prepared in Example 1, where a is a photo taken by the depth camera without polarized glasses, b is a photo taken by the depth camera with polarized glasses, c is the data mapping corresponding to a, d is the data mapping corresponding to b, and there is no stereoscopic display effect in a and c, while a stereoscopic display effect appears in b and d.

[0058] The dissymmetry factor g of circularly polarized luminescence of the flexible 3D display based on circularly polarized light obtained in this example lum has a value of approximately 1.00, and the pixel size is 2 mm × 2 mm.

[0059] Example 2

[0060] A template with a spacing of 3 mm is tightly combined with the PET substrate. The PEDOT:PSS solution is sprayed onto the template at a speed of 5 mm / S using a spray gun. After drying with hot air at 40 °C, a 2-mm-wide conductive line 1 is formed. Then, a layer of ZnS:Cu phosphor (20 wt%) dispersed in TPU is printed on this surface using a microelectronic printer, placed in an oven at 70 °C for 5 h to fully form. After that, a conductive line 2 orthogonal to the conductive line 1 is printed on the surface again using the template method, and a 3 mm × 3 mm light-emitting pixel is formed at the intersection to obtain an electroluminescent device.

[0061] In a light-shielded open sample bottle, add approximately 0.023 g of the organic chiral dopant S5011 and approximately 0.977 g of the liquid crystal E7 with macroscopic co-assembly ability in sequence. Ultrasonic for an appropriate time to fully mix the components to form a uniform and transparent solution. Then, place the sample in a vacuum drying oven and slowly evaporate the solvent for a certain time at an appropriate temperature. Finally, cool it to room temperature for use.

[0062] The preparation process is the same as that of the above chiral liquid crystal system, with the only difference being that approximately 0.023 g of the organic chiral dopant R5011 is added to the light-shielded open sample bottle. Add 5.00 g of the prepared polyacrylamide prepolymer and 2.00 g of a PVA aqueous solution (10%) to the above two light-shielded open sample bottles respectively, stir at a speed of 10000 rpm for 5 min in a homogenizer, and alternately print the obtained homogeneous mixtures with different chiralities onto the upper surface of the above-prepared electroluminescent device using a microelectronic printer. While heating to 30 °C, irradiate with a 365-nm light source for 5 min. Finally, a flexible 3D display based on circularly polarized light can be obtained.

[0063] The dissymmetry factor g of circularly polarized luminescence of the flexible 3D display based on circularly polarized light obtained in this example lum has a value of approximately 1.00, and the pixel size is 3 mm × 3 mm.

[0064] Example 3

[0065] A template with a 4-mm interval is tightly bonded to the PET substrate. The PEDOT:PSS solution is sprayed onto the template at a speed of 5 mm / s using a spray gun. After drying with hot air at 40 °C, a 2-mm-wide conductive line 1 is formed. Then, a layer of ZnS:Cu phosphor (20 wt%) dispersed in TPU is printed on this surface using a microelectronic printer, and it is placed in an oven at 70 °C for 5 h to be fully formed. Subsequently, a conductive line 2 orthogonal to the conductive line 1 is printed on the surface again using the template method, and a 4-mm × 4-mm light-emitting pixel is formed at the intersection, obtaining an electroluminescent device.

[0066] In a light-shielded open sample bottle, about 0.023 g of the organic chiral dopant S5011 and about 0.977 g of the liquid crystal E7 with macroscopic co-assembly ability are sequentially added. After ultrasonic treatment for an appropriate time to completely mix the components to form a homogeneous and transparent solution, the sample is then placed in a vacuum drying oven, and the solvent is slowly evaporated at an appropriate temperature for a certain time, and finally cooled to room temperature for use.

[0067] The preparation process of the chiral liquid crystal system is the same as above, except that about 0.023 g of the organic chiral dopant R5011 is added to the light-shielded open sample bottle.

[0068] To the above two light-shielded open sample bottles, 5.00 g of the prepared polyacrylamide prepolymer and 2.00 g of a PVA aqueous solution (10%) are respectively added. The mixture is stirred at a speed of 10000 rpm for 5 min under a homogenizer, and the obtained homogeneous mixtures with different chiralities are alternately printed onto the upper surface of the above-prepared electroluminescent device by a microelectronic printer. While heating to 30 °C, it is irradiated with a 365-nm light source for 5 min, and finally a flexible 3D display based on circularly polarized light can be obtained.

[0069] The dissymmetry factor g of the circularly polarized luminescence of the flexible 3D display based on circularly polarized light obtained in this example lum has a value of about 1.00, and the pixel size is 5 mm × 5 mm.

[0070] Example 4

[0071] A template with a 5-mm interval is tightly bonded to the PET substrate. The PEDOT:PSS solution is sprayed onto the template at a speed of 5 mm / s using a spray gun. After drying with hot air at 40 °C, a 2-mm-wide conductive line 1 is formed. Then, a layer of ZnS:Cu phosphor (20 wt%) dispersed in TPU is printed on this surface using a microelectronic printer, and it is placed in an oven at 70 °C for 5 h to be fully formed. Subsequently, a conductive line 2 orthogonal to the conductive line 1 is printed on the surface again using the template method, and a 5-mm × 5-mm light-emitting pixel is formed at the intersection, obtaining an electroluminescent device.

[0072] In a light-shielded open sample bottle, successively add about 0.023 g of the organic chiral dopant S5011 and about 0.977 g of the liquid crystal E7 with macroscopic co-assembly ability. Ultrasonic for an appropriate time to completely mix the components to form a uniform and transparent solution. Then place the sample in a vacuum drying oven and slowly evaporate the solvent for a certain time at an appropriate temperature. Finally, cool it to room temperature for later use.

[0073] The preparation process of the chiral liquid crystal system is the same as above, except that about 0.023 g of the organic chiral dopant R5011 is added in the light-shielded open sample bottle.

[0074] Add 5.00 g of the prepared polyacrylamide prepolymer and 2.00 g of 10% PVA aqueous solution to the above two light-shielded open sample bottles respectively. Stir at a speed of 10000 rpm for 5 min under a homogenizer. Print the obtained homogeneous mixtures with different chirality alternately onto the upper surface of the above-prepared electroluminescent device through a microelectronic printer. Heat to 30 °C and irradiate with a 365 nm light source for 5 min. Finally, a flexible 3D display based on circularly polarized light can be obtained.

[0075] The asymmetry factor g of circularly polarized luminescence of the flexible 3D display based on circularly polarized light obtained in this example lum is about 1.00, and the pixel size is 5 mm × 5 mm.

[0076] Example 5

[0077] Closely combine a template with a 2-mm interval with the PET substrate. Spray the PEDOT:PSS solution onto the template at a speed of 6 mm / S using a spray gun. After drying with hot air at 40 °C, form a 2-mm-wide conductive line 1. Then use a microelectronic printer to print a layer of ZnS:Cu phosphor (20 wt%) dispersed in TPU on this surface. Place it in an oven at 70 °C for 5 h to fully form. Then use the template method again to print a conductive line 2 orthogonal to the conductive line 1 on the surface. A 6 mm × 6 mm light-emitting pixel is formed at the intersection to obtain an electroluminescent device.

[0078] In a light-shielded open sample bottle, successively add about 0.023 g of the organic chiral dopant S5011 and about 0.977 g of the liquid crystal E7 with macroscopic co-assembly ability. Ultrasonic for an appropriate time to completely mix the components to form a uniform and transparent solution. Then place the sample in a vacuum drying oven and slowly evaporate the solvent for a certain time at an appropriate temperature. Finally, cool it to room temperature for later use.

[0079] The preparation process of the chiral liquid crystal system is the same as above, except that about 0.023 g of the organic chiral dopant R5011 is added in the light-shielded open sample bottle.

[0080] Add 5.00 g of the prepared polyacrylamide prepolymer and 2.00 g of PVA aqueous solution (10%) to the above two light-shielded open sample bottles respectively, stir at a speed of 10,000 rpm for 5 min under a homogenizer, and alternately print the obtained homogeneous mixtures with different chiralities onto the upper surface of the above-prepared electroluminescent device. While heating to 30 °C, irradiate with a 365 nm light source for 5 min, and finally a flexible 3D display based on circularly polarized light can be obtained.

[0081] The glum value of the circularly polarized luminescence of the flexible 3D display based on circularly polarized light obtained in this example is about 1.00, and the pixel size is 6 mm × 6 mm.

[0082] Figure 2 They are the actual photos of the self-positioning flexible 3D displays based on circularly polarized light prepared in Examples 1-5 above respectively; Figure 3 It is a schematic diagram of the internal structure of the self-positioning flexible 3D display prepared in Examples 1-5 above.

[0083] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A flexible 3D display, characterized in that, It includes a flexible substrate, a first conductive layer, an electroluminescent layer, a second conductive layer, and a circularly polarized light conversion layer connected in sequence; The circularly polarized light conversion layer is prepared by mixing a macro co-assembly capable molecule, an organic chiral dopant, an oil-water amphiphilic substance, and a polyacrylamide prepolymer, and reacting under heating and ultraviolet light irradiation.

2. The flexible 3D display according to claim 1, wherein The electroluminescent layer is selected from ZnS:Cu phosphor or ZnS:Mn phosphor.

3. The flexible 3D display according to claim 1, wherein The first conductive layer and the second conductive layer are independently selected from one or more of gold, silver, copper, and PEDOT:PSS.

4. The flexible 3D display according to claim 1, characterized in that, The flexible substrate is selected from one or more of high-density polyethylene, low-density polyethylene, polyvinyl chloride, chlorinated polyethylene, chlorosulfonated polyethylene (CSPE), plasticized polyolefin, ethylene-propylene rubber, chloroprene rubber, butene rubber, thermoplastic synthetic rubber, epichlorohydrin rubber, and polyethylene terephthalate.

5. The flexible 3D display according to claim 1, wherein The macro co-assembly capable molecule is selected from one or more of 4'-n-pentyl-4-cyanobiphenyl, 4'-n-pentyloxy-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl, 4'-n-octyloxy-4-cyanobiphenyl, 4'-n-pentyl-4-cyanotriphenyl, and liquid crystal E7; The organic chiral dopant is selected from one or more of S811, R811, S5011, and R5011.

6. The flexible 3D display according to claim 1, wherein The oil-water amphiphilic substance is selected from polyvinyl alcohol.

7. The flexible 3D display according to claim 1, characterized in that, The flexible 3D display includes a polyethylene terephthalate substrate, a PEDOT:PSS layer, a ZnS:Cu phosphor layer, a PEDOT:PSS layer, and a circularly polarized light conversion layer connected in sequence; The circularly polarized light conversion layer is prepared by mixing liquid crystal E7, organic chiral dopants S5011 and R5011, a polyacrylamide prepolymer, and an aqueous solution of polyvinyl alcohol, and reacting under heating and ultraviolet light irradiation.

8. The preparation method of the flexible 3D display according to any one of claims 1-7, characterized in that, It includes the following steps: (1) Coat a conductive layer, an electroluminescent layer, and a conductive layer on the surface of the flexible substrate in sequence to obtain material S1; (2) Mix a macro co-assembly capable molecule, an organic chiral dopant, an oil-water amphiphilic substance, and a polyacrylamide prepolymer, and coat the mixture on the surface of material S1 obtained in step (1), and react under heating and ultraviolet light irradiation to prepare the flexible 3D display.

9. The preparation method according to claim 8, characterized in that, The mass ratio of the macro co-assembly capable molecule to the organic chiral dopant is (5-10):(0.1-0.2); The mass ratio of the macro co-assembly capable molecule to the polyacrylamide prepolymer is (5-10):(50-90).

10. The preparation method according to claim 8, characterized in that, The temperature of the heating is 25°C - 40°C; The wavelength of the ultraviolet light for the ultraviolet light irradiation is 300 - 370 nm.

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