Application of fluorosilane in the preparation of blue phase liquid crystal photonic paper materials

Abstract

The present invention discloses the application of fluorosilane in the preparation of blue phase liquid crystal photonic paper materials. In the present invention, the blue phase liquid crystal polymer template film is treated with fluorosilane, which can effectively reduce the surface energy of the blue phase liquid crystal polymer template film, inhibit the lateral spreading of ink droplets after printing, and delay the longitudinal penetration of ink, thereby preventing the occurrence of droplet aggregation during ink printing, thereby preventing the problems of uneven color and blurred boundaries. The blue phase liquid crystal photonic paper material prepared by the present invention can improve printing accuracy, so that the minimum single point of printing can reach 51±14μm, and can achieve clear printing of multi-color patterns by adjusting the volume of printed ink. The raw materials of the present invention are widely available, the hydrophobic treatment process is simple and easy, and it has good applicability.

Description

Technical Field

[0001] The present invention relates to the field of blue phase liquid crystal materials, and more specifically, to the application of fluorosilane in the preparation of blue phase liquid crystal photonic paper materials. Background Art

[0002] Matter is generally classified into three phases: solid, liquid, and gas. The liquid crystal state is a special phase between these two states, exhibiting both the fluidity of a liquid and the anisotropy of a solid crystal. Molecules in this liquid crystal state are called liquid crystal molecules, and materials composed of these molecules are called liquid crystal materials. Common liquid crystal materials can be classified into smectic, nematic, and cholesteric phases based on their structures in the liquid crystal state. The cholesteric phase has garnered significant attention due to its molecular chirality, which allows the structure to interact with light in the ultraviolet, visible, and infrared regions.

[0003] Blue phase liquid crystal (BLLC) is a special type of cholesteric liquid crystal. It possesses three classic phases: Blue Phase III, Blue Phase II, and Blue Phase I. Blue Phase II and Blue Phase I exhibit a double twisted-column structure, which exhibits significant structural color effects on a macroscopic scale. Therefore, blue phase LC materials have potential applications in display and other areas. Despite their significant advantages, their use is limited by their temperature range. Methods for expanding the blue phase temperature range include polymer stabilization, molecular design, and hydrogen bonding. Polymer stabilization is favored due to its ease of operation and ability to escape the constraints of the liquid crystal cell.

[0004] Blue phase liquid crystal polymer films can be obtained by eluting the unpolymerized liquid crystal components to obtain a blue phase liquid crystal polymer template film, which is then refilled with nematic liquid crystals to produce a preset pattern. Printing methods facilitate the design and modification of preset patterns and enable rapid and stable patterning. Therefore, patterning on blue phase liquid crystal polymer template films via printing has practical application value. However, conventional blue phase liquid crystal polymer films can experience droplet coalescence during refilling, resulting in uneven color and blurred boundaries, making it difficult to accurately display the pattern. Therefore, improved printing accuracy is needed. Summary of the Invention

[0005] The present invention aims to provide the use of fluorosilane in the preparation of blue-phase liquid crystal photonic paper materials. Fluorosilane treatment reduces the surface energy of the blue-phase liquid crystal polymer template film, inhibits the lateral spreading of printed ink droplets, and delays the vertical penetration of the ink, thereby improving printing accuracy. The minimum printed single-dot diameter can reach 51±14μm.

[0006] In this application, a film obtained by polymerization under ultraviolet light is defined as a blue phase liquid crystal polymer film, which contains a small amount of unpolymerized liquid crystal molecules and a polymer network. A film obtained by soaking the blue phase liquid crystal polymer film in an organic solvent and removing the unpolymerized liquid crystal molecules is defined as a blue phase liquid crystal polymer template film, which contains only the polymer network. The blue phase liquid crystal photonic paper material is a fluorosilane-treated blue phase liquid crystal polymer template film that can be refilled with nematic liquid crystal ink to achieve the effect of clearly printing multi-color patterns. When printing accuracy is improved, it will help expand the application of blue phase liquid crystal photonic paper materials in the production of display devices, spectroscopic gratings, micro-optical paths, and other aspects.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The invention discloses the application of fluorosilane in preparing a blue phase liquid crystal photonic paper material. The blue phase liquid crystal polymer template film is treated with fluorosilane to obtain the blue phase liquid crystal photonic paper material.

[0009] In the present invention, treating a blue-phase liquid crystal polymer template film with fluorosilane effectively reduces its surface energy, inhibiting the lateral spread of printed ink droplets and delaying vertical ink penetration, thereby preventing droplet coalescence during printing, which can lead to uneven color and blurred boundaries. The blue-phase liquid crystal photonic paper material prepared by the present invention can improve printing precision, achieving a minimum single-point print size of 51±14μm. By adjusting the printed ink volume, it can also achieve clear printing of multicolor patterns.

[0010] Furthermore, the blue phase liquid crystal polymer template film is treated with fluorosilane by placing the blue phase liquid crystal polymer template film in a vacuum desiccator to which fluorosilane is added, vacuumizing the film, and treating the film for a period of time.

[0011] Furthermore, the treatment temperature is 20-80° C.; and the treatment time is 0.5-8 hours.

[0012] Those skilled in the art can select an appropriate heating device as needed to provide the desired temperature for the processing environment, thereby enhancing the bonding of the fluorosilane vapor to the blue phase liquid crystal polymer template film. In one embodiment of the present invention, a drying oven is selected as the heating device, and the vacuum dryer is placed in the drying oven for 0.5 to 8 hours to achieve the purpose of hydrophobic treatment. This effectively reduces the surface energy of the blue phase liquid crystal polymer template film, inhibits the lateral spread of ink droplets after printing, and delays the vertical penetration of the ink, thereby improving printing accuracy.

[0013] In a specific embodiment, the blue phase liquid crystal polymer template film needs to be treated in a vacuum plasma cleaner at an intensity of 200W for 600s, and then transferred to a vacuum dryer with fluorosilane liquid added and vacuumed for 30 minutes for further treatment.

[0014] Furthermore, the fluorosilane includes but is not limited to one or more of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane or hexadecyltriethoxysilane.

[0015] Furthermore, the ratio of the amount of fluorosilane to the surface area of the treated blue phase liquid crystal polymer template film is 0.3 to 4 μL:1 cm 2 .

[0016] Furthermore, the blue phase liquid crystal polymer template film is prepared by the following steps:

[0017] (1) uniformly mixing a non-photopolymerizable nematic liquid crystal, a photopolymerizable nematic liquid crystal, a chiral agent, a stabilizer, and a photoinitiator in a certain ratio to obtain a liquid crystal mixing system;

[0018] (2) The liquid crystal mixing system is then poured into the liquid crystal box by capillary action at 70-90°C, and then the temperature is gradually lowered to allow the liquid crystal mixing system to form a stable blue phase I structure. The system is polymerized by ultraviolet light irradiation, and then the polymerized sample is immersed in an organic solvent and dried to obtain a blue phase liquid crystal polymer template film.

[0019] In the present invention, the blue phase liquid crystal polymer template film comprises photopolymerizable liquid crystal molecules, a chiral agent, and a stabilizer.

[0020] Furthermore, the non-photopolymerizable nematic liquid crystal is one or more of 5CB, 8CB, E7, and HTG135200; preferably, the photopolymerizable nematic liquid crystal is one or more of RM105, RM257, RM82, and C6M; preferably, the chiral agent is a polymerizable chiral agent; preferably, the chiral agent is LC756; preferably, the stabilizer is TMPTA; preferably, the initiator is I-651.

[0021] Furthermore, the raw materials in the liquid crystal mixing system are calculated by weight percentage:

[0022]

[0023] Variations in the chiral agent content can cause changes in the color of the prepared blue-phase liquid crystal polymer film. The higher the chiral agent content, the smaller the central wavelength of the blue-phase liquid crystal polymer film's reflection spectrum within the visible light range. For example, a formulation with 6% chiral agent added produces a green blue-phase liquid crystal polymer film, while a formulation with 5.5% chiral agent adds an orange blue-phase liquid crystal polymer film. After the blue-phase photonic paper material is prepared, the colors it can display during printing are limited by the colors it displays in its original blue-phase liquid crystal polymer film state. For example, a photonic paper material with 6% chiral agent added can produce blue and green by varying the printing ink volume, but cannot produce orange. However, a photonic paper material with 5.5% chiral agent added can produce blue, green, and orange by varying the printing ink volume.

[0024] In one embodiment, in step (2), a precision hot and cold stage device is introduced during the gradient cooling stage to precisely control the temperature of the gradient cooling process.

[0025] Furthermore, the wavelength of the ultraviolet light is 365 nm; the ultraviolet light irradiation time is 1 to 30 min; the ultraviolet light irradiation intensity is 0.5 to 50 mW / cm 2 .

[0026] Furthermore, the organic solvent includes but is not limited to one or more of dichloromethane, tetrahydrofuran or N,N-dimethylformamide (DMF).

[0027] In a specific embodiment, ultraviolet light irradiation is used to polymerize the photopolymerizable monomer molecules in the mixed system to form a polymer network, and then the polymer network is immersed in an organic solvent for 1 to 30 minutes, and the unpolymerized liquid crystal molecules are removed by the organic solvent to obtain a pure polymer network, that is, a blue phase liquid crystal polymer template film.

[0028] In one embodiment, the liquid crystal cell needs to be pre-treated by spin-coating the bottom cell of the liquid crystal cell with 3-(methacryloyloxy)propyltrimethoxysilane (i.e., Z6003) to fix the blue phase liquid crystal polymer film, prevent the blue phase liquid crystal polymer film from cracking when the liquid crystal cell is opened, and keep the blue phase liquid crystal polymer template film flat during the printing process. The structural formula of Z6003 is as follows:

[0029]

[0030] The top cell of the liquid crystal cell is spin-coated with PVA and subjected to parallel rubbing alignment treatment. Only after the above treatment is completed can the liquid crystal mixing system be poured in. The thickness of the liquid crystal cell is 10 to 50 μm.

[0031] The beneficial effects of the present invention are as follows:

[0032] In the present invention, treating a blue-phase liquid crystal polymer template film with fluorosilane effectively reduces its surface energy, inhibiting the lateral spread of printed ink droplets and delaying vertical ink penetration, thereby preventing droplet coalescence during printing, which can lead to uneven color and blurred boundaries. The blue-phase liquid crystal photonic paper material prepared by the present invention can improve printing precision, achieving a minimum single-point print size of 51±14μm. By adjusting the printed ink volume, it can also achieve clear printing of multicolor patterns. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Figure 1 The polarizing microscope (POM) photos and line width detection results of the samples of Example 1, Comparative Example 1 and Comparative Example 2 after printing are compared.

[0035] Figure 2 The comparison of the QR code pattern printing result photos, POM photos, spectra of the pattern printing area and scanning printing results of the samples of Example 2 and Comparative Example 2 is shown.

[0036] Figure 3 A comparison of apple pattern printed photos and POM pictures of the samples of Example 3 and Comparative Example 3 is shown.

[0037] Figure 4 Shown are a printed photograph of the four-leaf pattern of the sample of Example 3 and a graph showing the change in spectrum over time. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and figures. It should be understood by those skilled in the art that the specific description below is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention. Any range described in the present invention includes the end value and any numerical value between the end values, as well as any sub-range formed by the end value or any numerical value between the end values.

[0039] Example 1

[0040] (1) Preparation of 6% chiral agent blue phase liquid crystal mixing system

[0041] A single double bond polymerizable monomer RM105, a two double bond polymerizable monomer RM257, a non-polymerizable nematic commercial mixed liquid crystal monomer HTG135200, a polymerizable chiral agent LC756, a stabilizer TMPTA, and an initiator I-651 were weighed using a balance. The compositions, by mass percentage, were 46%, 15%, 30%, 6%, 2.5%, and 0.5%, respectively. They were dissolved in 3 mL of dichloromethane, and the dichloromethane was completely evaporated before use.

[0042] (2) Preparation of liquid crystal cell

[0043] The top cell was a clean glass slide spin-coated with PVA and subjected to parallel rubbing. A 1 wt% PVA aqueous solution was prepared, spin-coated at 3000 rpm for 30 seconds, and then dried at 80°C for 1 hour. The bottom cell was a clean glass slide spin-coated with Z6003. A 1 wt% Z6003 solution was prepared using a 1:1 volume ratio of isopropyl alcohol to water. The solution was spin-coated at 3000 rpm for 30 seconds and then dried at 100°C for 1 hour. The cell spacers were made of 25 μm thick PET film.

[0044] (3) Using capillary force on a 90°C hot plate, the prepared liquid crystal mixed system is poured into the liquid crystal cell and transferred to a precision hot and cold plate at 70°C;

[0045] (4) Cooling from 70℃ to 56.5℃ slowly forms a stable blue phase I structure. 2 The blue phase liquid crystal polymer film was obtained by irradiating the film under ultraviolet light with a wavelength of 365 nm for 1 min.

[0046] (5) Opening the liquid crystal cell, washing out the unpolymerized liquid crystal monomers and other molecules with DMF solvent, and drying in air to obtain a 2 cm × 2.5 cm blue phase liquid crystal polymer template film;

[0047] (6) The blue phase liquid crystal polymer template film was removed and placed in a vacuum plasma cleaner at 200W intensity for 600s. The film was then placed in a 2.5L vacuum desiccator with 2μL of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane added and vacuumed for 30min. The vacuum desiccator was then placed at 25°C for 8h.

[0048] (7) Take out the sample and obtain the blue phase liquid crystal photonic paper material.

[0049] Example 2

[0050] The preparation steps were similar to those in Example 1, except that the treatment conditions in step (6) were changed to 80° C. for 0.5 h. Other parameters remained the same as those in Example 1.

[0051] Example 3

[0052] (1) Preparation of 5.5% chiral agent blue phase liquid crystal mixing system

[0053] A single double bond polymerizable monomer RM105, a two double bond polymerizable monomer RM257, a non-polymerizable nematic commercial mixed liquid crystal monomer HTG135200, a polymerizable chiral agent LC756, a stabilizer TMPTA, and an initiator I-651 were weighed using a balance. The compositions, by mass percentage, were 46%, 15%, 30%, 5.5%, 2.5%, and 0.5%, respectively. The mixture was dissolved in 3 mL of dichloromethane, and the dichloromethane was completely evaporated before use.

[0054] (2) Preparation of liquid crystal cell

[0055] The top cell was a clean glass slide spin-coated with PVA and subjected to parallel rubbing. A 1 wt% PVA aqueous solution was prepared, spin-coated at 3000 rpm for 30 seconds, and then dried at 80°C for 1 hour. The bottom cell was a clean glass slide spin-coated with Z6003. A 1 wt% Z6003 solution was prepared using a 1:1 volume ratio of isopropyl alcohol to water. The solution was spin-coated at 3000 rpm for 30 seconds and then dried at 100°C for 1 hour. The cell spacers were made of 25 μm thick PET film.

[0056] (3) Using capillary force on a 90°C hot plate, the prepared liquid crystal mixed system is poured into the liquid crystal cell and transferred to a precision hot and cold plate at 70°C;

[0057] (4) Cooling from 70℃ to 58℃ slowly forms a stable blue phase I structure. 2 The blue phase liquid crystal polymer film was obtained by irradiating the film under ultraviolet light with a wavelength of 365 nm for 1 min.

[0058] (5) Opening the liquid crystal cell, washing out the unpolymerized liquid crystal monomers and other molecules with DMF solvent, and drying in air to obtain a 2 cm × 2.5 cm blue phase liquid crystal polymer template film;

[0059] (6) The blue phase liquid crystal polymer template film was removed and placed in a vacuum plasma cleaner at 200W intensity for 600s. The film was then placed in a 2.5L vacuum desiccator with 2μL of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane added and vacuumed for 30min. The vacuum desiccator was then placed at 25°C for 8h.

[0060] (7) Take out the sample and obtain the blue phase liquid crystal photonic paper material.

[0061] Comparative Example 1

[0062] The preparation steps were similar to those in Example 1, with only the fluorosilane treatment in step (6) omitted. Other preparation conditions remained the same as those in Example 1.

[0063] Comparative Example 2

[0064] The preparation steps were similar to those in Example 1, except that step (6) was omitted. Other preparation conditions remained the same as those in Example 1.

[0065] Comparative Example 3

[0066] The preparation steps were similar to those in Example 3, except that step (6) was omitted. Other preparation conditions remained the same as those in Example 3.

[0067] Test Example 1

[0068] Contact angle tests were conducted on Comparative Example 1, Comparative Example 2, and Example 1, using a 2 μL droplet of deionized water at room temperature as the test liquid. The contact angles of the Comparative Example 1 sample were 2°, 72°, and 100°, respectively. The Comparative Example 1 sample treated with a vacuum plasma cleaner exhibited a contact angle of less than 10°, indicating significant wettability. The untreated Comparative Example 2 sample exhibited a contact angle greater than 65°, indicating moderate hydrophobicity. The fluorosilane-treated Example 1 sample exhibited a contact angle greater than 65° but less than 150°, demonstrating the good hydrophobicity of the blue phase liquid crystal photonic paper material.

[0069] Then, a printing test was conducted: a parallel line pattern with a line width of 50 μm and a spacing of 250 μm was designed, and liquid crystal molecules 5CB were selected as ink to print the line pattern on the above three samples. The results are shown in Fig. Figure 1 . Figure 1The POM photograph and laser scanning microscope scanning curve of the printing results are shown. In the POM photograph, the color change of the lines in Comparative Example 1 is uneven, the lines show obvious lateral diffusion, and regular lines cannot be obtained; Comparative Example 2 shows uneven color change, and the lateral diffusion of the lines is weaker than that of Comparative Example 1, and relatively regular lines can be obtained, and the average width is measured to be 131±19μm; while in Example 1, the color change of the printing result is uniform, the lateral diffusion effect is weak, and very regular lines are obtained, and the average width is measured to be 51±14μm. The result of Example 1 is closest to the preset value of the printed pattern. In the laser scanning microscope detection, a cross section is selected as the lateral width detection position, and the scanning curves of Comparative Example 1, Comparative Example 2 and Example 1 are obtained. The widths of the central line cross section of the scanning curve are 305μm, 136μm and 62μm, respectively, which are consistent with the results of the polarizing microscope photograph. It shows that the blue phase liquid crystal polymer template film treated with fluorosilane can inhibit the lateral diffusion of droplets on the film surface, obtain uniform color change and narrow line width, and improve the printing result.

[0070] Test Example 2

[0071] The samples prepared in Example 2 and Comparative Example 2 were used for printing test: a 1cm×1cm QR code pattern containing the letter "BPLC" was designed, and liquid crystal molecules 5CB were selected as ink to print the pattern on the sample. The results are shown in FIG. Figure 2 . Figure 2 Photos of the QR code patterns printed in Comparative Example 2 and Example 2, POM photos, reflection spectra and mobile phone scanning results are shown. As can be seen from the photos, the printing result of Comparative Example 2 is uneven in color, cannot fully present the QR code pattern, and the printed lines are of different widths and appear in dot form, so the QR code information cannot be obtained by scanning; while the printing result in Example 2 is uniform in color, with clear edges and a regular pattern, so it can be used for scanning and the "BPLC" information of the QR code can be obtained. The POM photos further show the sample structure in a microscopic state. The short side length of the printed square structure in Comparative Example 2 reaches 592±16μm, while the short side length in Example 2 is maintained at 478±7μm, and the pattern quality is significantly improved. It can be seen from the curve of the reflection spectrum that both samples can show green, and there is no obvious difference in reflection intensity. The reflection intensity of Comparative Example 2 is 37%, and the reflection intensity of Example 2 is 32%.

[0072] Test Example 3

[0073] The samples prepared in Example 3 and Comparative Example 3 were used for printing tests: an apple pattern consisting of three parts was designed: Component 1: the apple stem pattern was printed in situ twice; Component 2: the apple leaf pattern was printed in situ three times; Component 3: the apple flesh pattern was printed in situ four times, and liquid crystal molecule 5CB was selected as the ink to print the apple pattern on the sample. The results are shown in FIG. Figure 3 ,in Figure 3 The group of images above the dotted line shows the apple pattern printed in Comparative Example 3, while the group of images below the dotted line shows the apple pattern printed in Example 3. After the pattern was printed, as the ink penetrated, the areas of Composition 1, Composition 2, and Composition 3 in Comparative Example 3 and Example 3 displayed different colors. However, the color change in the same composition areas in Comparative Example 3 was uneven. At 0 seconds after printing, the areas of Composition 1, Composition 2, and Composition 3 in Comparative Example 3 all displayed orange. After 2 hours, Composition 1 displayed blue, green, and orange-red, Composition 2 displayed blue and orange-red, and Composition 3 displayed green and orange-red. From 2 to 14 days, Composition 1 turned green, Composition 2 displayed green and yellow, and Composition 3 displayed green and orange-red with an extension of orange. In Example 3, no color was displayed at 0 seconds. At 2 hours, all compositions began to display red. The 2-day photograph shows that the sample turned uniformly red. At 3 days, Composition 1 and Composition 2 turned uniformly green, while Composition 3 remained red. From 3 to 14 days, Composition 1 and Composition 2 remained uniformly green, while Composition 3 remained red. Furthermore, in terms of shape comparison, at 0 s, the shape of component 1 in Comparative Example 3 failed to maintain its stem pattern, becoming a curved rectangle, and at 14 d, it became nearly elliptical. In contrast, the shape of component 1 in Example 3 was well maintained for 14 d. It is clear that the fluorosilane treatment plays a significant role in maintaining the uniformity of the pattern's shape and color after the printing process.

[0074] Test Example 4

[0075] The sample of Example 3 was used to print the four-leaf pattern. The leaf pattern No. 1 was printed in situ once, the leaf pattern No. 2 was printed in situ twice, the leaf pattern No. 3 was printed in situ three times, and the leaf pattern No. 4 was printed in situ four times. The results are shown in FIG. Figure 4 After printing, leaf No. 1 appears green, and leaves No. 2, 3, and 4 appear yellow. As time changes, from 1 to 65 hours, leaf No. 1 turns dark blue, and the corresponding reflection spectrum moves from 570nm to 480nm; leaf No. 2 changes from yellow to green and finally to light blue, and the corresponding reflection spectrum also moves from 590nm to 480nm; leaf No. 3 changes from yellow to green, and the reflection spectrum moves from 590nm to 575nm; leaf No. 4 changes from yellow to orange, and the reflection spectrum moves from 590nm to 610nm. Figure 4 It can be seen that the blue phase liquid crystal polymer template film treated with fluorosilane can prepare regular multi-color patterns.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. Application of fluorosilane in the preparation of blue phase liquid crystal photonic paper material, characterized in that: A blue phase liquid crystal polymer template film is treated with fluorosilane to obtain a blue phase liquid crystal photonic paper material; The blue phase liquid crystal polymer template film is treated with fluorosilane by placing the blue phase liquid crystal polymer template film in a vacuum desiccator with fluorosilane added thereto, evacuating the film, and treating the film for a period of time. The treatment temperature is 20-80°C; the treatment time is 0.5-8 hours; The fluorosilane is 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane; The ratio of the amount of fluorosilane to the surface area of the treated blue phase liquid crystal polymer template film is 0.3~4 μL:1cm 2 .

2. The use according to claim 1, characterized in that The blue phase liquid crystal polymer template film is prepared by the following steps: (1) uniformly mixing non-photopolymerizable nematic liquid crystal, photopolymerizable nematic liquid crystal, chiral agent, stabilizer, and photoinitiator in a certain proportion to obtain a liquid crystal mixing system; (2) The liquid crystal mixing system is then poured into the liquid crystal box by capillary action at 70-90 °C, and then the temperature is gradually lowered to allow the liquid crystal mixing system to form a stable blue phase I structure. It is polymerized by ultraviolet light irradiation, and then the polymerized sample is immersed in an organic solvent and dried to obtain a blue phase liquid crystal polymer template film.

3. The use according to claim 2, characterized in that The non-photopolymerizable nematic liquid crystal is HTG135200.

4. The use according to claim 2, characterized in that The photopolymerizable nematic liquid crystals are RM105 and RM257.

5. The use according to claim 2, characterized in that The chiral agent is a polymerizable chiral agent.

6. The use according to claim 2, characterized in that The chiral agent is LC756.

7. The use according to claim 2, characterized in that The stabilizer is TMPTA.

8. The use according to claim 2, characterized in that The initiator is I-651.

9. The use according to claim 2, characterized in that The raw materials in the liquid crystal mixing system are calculated by weight percentage: Non-photopolymerizable nematic liquid crystal 20~40%; Photopolymerizable nematic liquid crystal 50~70%; Chiral agent 4.5~7%; Stabilizer 1~5%; Photoinitiator 1~4%.

10. The use according to claim 2, characterized in that The wavelength of the ultraviolet light is 365 nm; the ultraviolet light irradiation time is 1 to 30 min; the ultraviolet light irradiation intensity is 0.5 to 50 mW / cm 2 .

11. The use according to claim 2, characterized in that The organic solvent includes one or more of dichloromethane, tetrahydrofuran or N, N-dimethylformamide.

12. The use according to claim 2, characterized in that The bottom cell of the liquid crystal cell is subjected to Z6003 spin coating, the top cell of the liquid crystal cell is subjected to PVA spin coating and parallel rubbing alignment treatment, and the thickness of the liquid crystal cell is 10-50 μm.

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