A method for fabricating an optical liquid crystal array for a three-primary-color naked-eye 3D display

Abstract

This invention provides a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display. The silicon pillar template has a hydrophilic top and hydrophobic sidewalls. A uniform circular hole structure is designed on one side of the substrate according to the periodic dimensions of the silicon pillar to facilitate subsequent solution injection. The substrate is placed over the silicon pillar, and then red, green, and blue three-primary-color liquid crystal precursor solutions are injected into six adjacent circular holes using a single inkjet printing method. Each color contains two solutions with different chirality (left-handed L and right-handed R). Due to capillary force guidance, the precursor solution forms a single capillary bridge between the top of the silicon pillar and the substrate. The assembled structure is placed in a vacuum oven at an appropriate temperature. Under the action of unidirectional capillary force, the capillary bridge shrinks, and the solvent completely evaporates onto the substrate to obtain a red, green, and blue three-primary-color liquid crystal array, where each color includes two arrays with different chirality. Finally, a columnar lens film is attached to the substrate to refract light of different chirality into the left and right eyes, achieving the naked-eye 3D display effect.

Description

Technical Field

[0001] This invention relates to the field of basic electrical components technology, and specifically to a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display. Background Technology

[0002] 3D display technology has attracted widespread attention due to its ability to display richer information such as the shape and depth of objects. Among these technologies, glasses-free 3D display utilizes the principle of binocular parallax, allowing the left and right eyes to receive different images, which are then superimposed to create a stereoscopic effect. The key technological foundation for realizing glasses-free 3D display lies in the fabrication of neatly arranged and oriented microarrays of three-primary-color liquid crystal molecules.

[0003] In recent years, various processing methods have been used to fabricate three-primary-color arrays, such as inkjet printing, dip pen printing, and vacuum evaporation. These methods can produce large-area three-primary-color arrays, but due to the limitations of the processing techniques, the resolution of the arrays produced by these methods is not high enough. Moreover, these methods are not very universal and have high requirements for materials, which poses a great challenge to the realization of naked-eye 3D display technology.

[0004] Therefore, a new, universal, and efficient method for fabricating liquid crystal microarrays is needed to achieve the fabrication of high-resolution three-color microarrays. Summary of the Invention

[0005] This invention addresses the problem of fabricating high-resolution three-primary-color microarrays by providing a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display. The method involves designing a silicon pillar template with a specially shaped periodic structure, enabling unidirectional liquid transport within the assembly system. Injection holes with the same period as the silicon pillars are etched onto the substrate. After alignment with alignment marks, the solution is injected, and self-assembly occurs under the induction of capillary liquid bridges. This results in a three-primary-color liquid crystal microarray with controllable dimensions on the substrate. Furthermore, a columnar lens array is added to induce visual aberration between the left and right eyes, achieving naked-eye 3D display technology.

[0006] This invention provides a method for fabricating an optical liquid crystal array for a three-primary-color naked-eye 3D display, comprising the following steps:

[0007] S1. Prepare a silicon pillar template. The silicon pillar template includes a silicon pillar template body, an array of silicon pillars arranged on the upper part of the silicon pillar template body, and a first alignment mark arranged on the silicon pillar template body. The silicon pillar array includes at least two silicon pillars arranged in an array. The silicon pillars have the same height. The top of the silicon pillar is hydrophilic and the sidewalls are hydrophobic.

[0008] Prepare a substrate, which includes a substrate body and injection holes and a second alignment mark disposed on the substrate body. The injection holes are through holes and have the same number of rows as the silicon pillars.

[0009] S2. Under a microscope with a three-dimensional moving platform, cover the silicon pillar array with the substrate and make the first alignment mark and the second alignment mark in the same position, and set the injection hole above the starting end of each column of silicon pillars.

[0010] S3. Simultaneously inject liquid crystal precursor solution into each injection hole. The liquid crystal precursor solution includes a left-handed or right-handed chiral additive. The liquid crystal precursor solution flows into the top of the substrate and the silicon pillar to form a capillary bridge. The substrate, the capillary bridge and the silicon pillar form a sandwich structure.

[0011] S4. The sandwich structure is placed in a vacuum oven and heated. The capillary bridge shrinks under the action of unidirectional capillary force. After the solvent of the capillary bridge evaporates completely, a liquid crystal array is obtained on the upper surface of the substrate. The chirality of two adjacent liquid crystal arrays is opposite.

[0012] S5. Under the control of the micro-operation platform, the columnar lens film is pasted onto the liquid crystal array to obtain an optical liquid crystal array for naked-eye 3D display. The optical liquid crystal array for naked-eye 3D display is now prepared.

[0013] The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, as a preferred embodiment, in step S1, the number of columns of the silicon pillar array is an integer multiple of 6, each column of the silicon pillar array includes at least two silicon pillars, the silicon pillar array is a linear array, and the substrate is plasma-modified.

[0014] In step S3, six liquid crystal precursor solutions are injected simultaneously into six adjacent injection holes in sequence. The liquid crystal precursor solutions are: red left-handed liquid crystal precursor solution, red right-handed liquid crystal precursor solution, green left-handed liquid crystal precursor solution, green right-handed liquid crystal precursor solution, blue left-handed liquid crystal precursor solution, and blue right-handed liquid crystal precursor solution.

[0015] In step S4, the liquid crystal array consists of red left-handed liquid crystal pixels, red right-handed liquid crystal pixels, green left-handed liquid crystal pixels, green right-handed liquid crystal pixels, blue left-handed liquid crystal pixels, and blue right-handed liquid crystal pixels in sequence.

[0016] In step S5, the optical liquid crystal array is a three-primary-color optical array.

[0017] The present invention describes a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display. In a preferred embodiment, in step S1, the silicon pillar template is prepared by photolithography. Photoresist is coated on a wafer, and the structure of the silicon pillar is etched under a mask using ultraviolet light. Then, deep reactive ion etching is used to further etch the photolithographic structure to obtain the silicon pillar template.

[0018] The injection holes are fabricated using photolithography and reactive ion etching. The injection holes are circular, and the spacing and period of the injection holes are the same as the spacing and period of the silicon pillars.

[0019] The first alignment mark and the second alignment mark are both prepared by photolithography. The first alignment mark is set at the corner of the silicon pillar template body, and the second alignment mark is set at the corner of the substrate body. Both the first alignment mark and the second alignment mark are cross-shaped.

[0020] The substrate can be any of the following: glass sheet, indium tin oxide conductive glass, quartz sheet, silicon dioxide sheet, silicon wafer, polyethylene terephthalate, and polyimide.

[0021] In a preferred embodiment of the method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, in step S1, after the substrate is prepared, it is modified in ozone plasma for 5 to 15 minutes.

[0022] In the preferred embodiment of the method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, in step S1, each silicon pillar has a length of 5-20 μm, a width of 1-5 μm, and a height of 20-30 μm, the spacing between each silicon pillar in each row is 10-100 μm, and the spacing between each silicon pillar in each column is 1-3 μm.

[0023] In a preferred embodiment of the method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, in step S3, a liquid crystal precursor solution is simultaneously injected into the injection hole using an inkjet printing method, and the liquid crystal precursor solution is transferred only between each column of silicon pillars.

[0024] The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, as a preferred embodiment, in step S3, the liquid crystal precursor solution includes liquid crystal molecules, chiral molecules, organic fluorescent dye molecules and solvent, and the concentration of the liquid crystal precursor solution is the same and is 1 to 100 mg / mL.

[0025] The liquid crystal molecule can be any of the following: nematic liquid crystal molecule, smectic liquid crystal molecule, cholesteric liquid crystal molecule, and disk-type liquid crystal molecule;

[0026] The structure of the liquid crystal molecule is any one of the following: biphenyl nitrile liquid crystal molecule structure, ester liquid crystal molecule structure, cyclohexylbiphenyl liquid crystal molecule structure, pyrimidine ring liquid crystal molecule structure, ethyl bridging liquid crystal molecule structure, olefin-terminated liquid crystal molecule structure, and fluorinated benzene ring liquid crystal molecule structure.

[0027] Chiral molecules are introduced into the liquid crystal precursor solution via chiral additives;

[0028] Solvents include nonpolar solvents and polar solvents. Nonpolar solvents are made of esters, aromatic hydrocarbons, or hydrocarbons.

[0029] The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, as a preferred embodiment, uses any one of the following biphenyl nitrile liquid crystal molecular structures: 2-cyanobiphenyl liquid crystal molecular structure, 4-cyanobiphenyl liquid crystal molecular structure, 4-propyl-4'-cyanobiphenyl liquid crystal molecular structure, pentylbiphenyl nitrile liquid crystal molecular structure, hexylbiphenyl nitrile liquid crystal molecular structure, heptylbiphenyl nitrile liquid crystal molecular structure, and octylbiphenyl nitrile liquid crystal molecular structure.

[0030] The ester liquid crystal molecule structure is any one of the following: cholesterol benzoate liquid crystal molecule structure and benzoate liquid crystal molecule structure;

[0031] The cyclohexylbiphenyl liquid crystal molecule structure is a 4,4'-dialkyl-substituted cyclohexylbiphenyl liquid crystal molecule structure;

[0032] The molecular structure of oxygen-containing heterocyclic benzene liquid crystals is a dibenzofuran-containing oxygen-containing heterocyclic liquid crystal molecular structure;

[0033] The liquid crystal structure of the pyrimidine ring molecule is 4,4'-bis(5-propylpyrimidine)biphenyl liquid crystal molecule structure;

[0034] The liquid crystal structure of diphenylacetylene molecules is a cyclohexyldiphenylacetylene liquid crystal molecule structure.

[0035] The ethyl-bridged liquid crystal structure is 1-(4-n-alkylcyclohexyl)-2-[4-(4-n-alkylcycloethyl)phenyl]) liquid crystal molecule structure;

[0036] The chiral additive is any one of the following: R / S1011, R / S2011, R / S5011, R / S811, CB15 and ZLI4572;

[0037] The organic fluorescent dye molecule is any one of the following: coumarin, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylamino)-4H-pyran (DCM), methylene pyrrole, oligostyrene dyes (o-MSB), and quinoxaline derivatives;

[0038] The nonpolar solvent is any one of the following: toluene, chlorobenzene, o-dichlorobenzene, m-xylene, carbon tetrachloride, carbon disulfide, n-hexane, and n-octane;

[0039] The polar solvent is any one of the following: DMF, DMSO, dichloromethane, alcohols, aldehydes, and water.

[0040] In a preferred embodiment of the method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, in step S3, the height of the capillary liquid bridge is controlled by adjusting the external stress applied to the substrate, thereby controlling the thickness of the liquid crystal molecule array.

[0041] In the method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to the present invention, as a preferred embodiment, in step S4, the maximum temperature of the vacuum oven heating does not exceed the boiling point of the solvent in the liquid crystal precursor solution.

[0042] In step S5, the columnar lens film is prepared by nanoimprinting and ultraviolet curing, and then the columnar lens film is attached to the liquid crystal array under a microscope.

[0043] A method for fabricating a three-primary-color naked-eye 3D display optical liquid crystal array includes the following steps:

[0044] A substrate with periodically injected circular holes was placed over a silicon pillar template. Under a microscope, the substrate and silicon pillars were aligned using alignment marks. Red, green, and blue tri-color liquid crystal precursor solutions were injected using inkjet printing, with each color containing two chiral precursor solutions. Due to the confinement effect of the silicon pillars, the solution could only move from regions with large capillary radii to regions with small capillary radii. Therefore, the solution would not enter the grooves (i.e., the region between two rows of silicon pillars), but would only form capillary liquid bridges between the silicon pillars and the substrate. Different solutions would not come into contact with each other, thus avoiding interference with the growth of different liquid crystal material arrays. The assembled structure was placed in a vacuum oven at a suitable temperature. As the solvent evaporated, the liquid bridges contracted under the action of unidirectional capillary force, and the solute moved towards the position of the three-phase line contraction, undergoing self-assembly. After the solvent completely evaporated, tri-color liquid crystal microarrays with different chiralities were obtained on the substrate. The prepared columnar lens film was then adhered to the tri-color liquid crystal microarray substrate, completing the fabrication of the entire naked-eye 3D liquid crystal optical array substrate.

[0045] Traditional methods for fabricating three-primary-color microarrays generally involve inkjet printing, dip pen printing, and vacuum evaporation. However, these methods have significant drawbacks, such as insufficient resolution of the fabricated three-primary-color arrays, limited applicability of processable materials, a limited variety of substrates to choose from, and low printing efficiency. The fabrication method provided in this invention utilizes a substrate with liquid-filled circular holes bearing alignment marks, enabling simultaneous fabrication of multiple colors and arrays in a single inkjet printing operation. This not only improves the regularity of the arrays but also significantly increases the fabrication efficiency of the three-primary-color arrays. Furthermore, the method employs capillary liquid bridge-induced assembly to grow the liquid crystal microarrays. This approach offers the advantage of substantially improved resolution of the three-primary-color arrays, producing arrays with regular morphology and ordered crystal orientation. The fabrication method provided in this invention forms the basis for applications in naked-eye 3D display technology.

[0046] Preferably, the width of a single column in the silicon column template is 1 to 3 μm, and the spacing between adjacent columns is 10 to 100 μm, ensuring that the liquid is transported longitudinally without causing crosstalk between different colored liquids due to lateral transport.

[0047] Preferably, the substrate is selected from one of glass sheet, indium tin oxide conductive glass, quartz sheet, silicon dioxide sheet, silicon wafer, polyethylene terephthalate and polyimide.

[0048] Preferably, the period of the circular holes on the substrate is consistent with the period of the silicon pillars, and the substrate is prepared using a one-step photolithography method.

[0049] Preferably, both sides of the silicon pillar template and both sides of the substrate have photolithographically etched cross alignment marks.

[0050] Preferably, the tri-color liquid crystal precursor solutions with different chiralities are mixed precursor solutions of liquid crystal molecules, chiral molecules, and organic fluorescent dye molecules. The liquid crystal molecules include nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, and disk-type liquid crystals. Specific liquid crystal molecule structures include biphenyl nitrile compounds (such as 2-cyanobiphenyl, 4-cyanobiphenyl, 4-propyl-4'-cyanobiphenyl, pentylbiphenylnitrile, hexylbiphenylnitrile, heptylbiphenylnitrile, octylbiphenylnitrile, etc.) and esters (such as cholesterol benzoate). Liquid crystal molecules include esters, benzoates, etc., cyclohexyl biphenyls (4,4'-dialkyl-substituted cyclohexyl biphenyls), oxygen-containing heterocyclic benzenes (such as dibenzofuran and oxygen-containing heterocyclic benzenes), pyrimidine rings (such as 4,4'-di(5-propylpyrimidine)biphenyl), diphenylacetylenes (such as cyclohexyldiphenylacetylene), ethyl bridging groups (such as 1-(4-n-alkylcyclohexyl)-2-[4-(4-n-alkylcycloethyl)phenyl]), olefin-terminated groups, and various fluorinated benzene ring liquid crystal molecules.

[0051] Preferably, the chiral additives in the liquid crystal material include R / S1011, i.e., (1R / S)-2-{[4-(trans-4-heptyl)benzoyl]oxy}-1-phenylethyl 4-(trans-4-heptyl)benzoate, R / S2011, i.e., (R / S)-4-(3,5-difluoro-4-(octane-2-yloxy)phenyl)-4'-propyl-1,1'-di(cyclohexane), and R / S5011, i.e., (13BR / S)-5,6-dihydro-5-(trans-4-yloxy)phenyl. -4-propylcyclohexyl)-4H-dinaphtho[2,1-F:1',2'-H][1,5]dioxane-nonatetraene, R / S811 is 4-(4'-hexyloxy)benzoyloxybenzoic acid-(R / S)-(-)-2-octanol ester, CB15 is ((+)-4'-(2-methylbutyl)-4-biphenylcyanide), ZLI4572 is (benzoic acid, 4-(p-4-pentylcyclohexyl), (1R)-1-phenyl-1,2-ethylenedimethyl ester), etc.

[0052] Preferably, the organic laser dye molecules of the liquid crystal material include coumarin, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylamino)-4H-pyran (DCM), methylene pyrrole, oligostyrene dyes (o-MSB), quinoxaline derivatives, etc.

[0053] Preferably, the concentration of the liquid crystal material precursor solution is between 1 and 100 mg / ml.

[0054] Preferably, the columnar lens film is prepared by nanoimprinting and ultraviolet curing.

[0055] This invention provides a method for fabricating an optical liquid crystal array for a three-primary-color naked-eye 3D display. A silicon pillar template is modified into an asymmetric wettable structure with a hydrophilic top and hydrophobic sidewalls. A uniform circular hole structure is designed on one side of the substrate according to the periodic dimensions of the silicon pillar to facilitate subsequent solution injection. The substrate is placed over the silicon pillar, and then red, green, and blue liquid crystal precursor solutions are injected into six adjacent circular holes using a single inkjet printing method. Each color contains two solutions with different chirality, for a total of six different solutions. Due to capillary guidance, the precursor solutions do not enter the grooves but instead form individual capillary bridges between the top of the silicon pillar and the substrate. The assembled structure is placed in a vacuum oven at an appropriate temperature. The capillary bridges shrink under the action of unidirectional capillary force. After the solvent completely evaporates, a red, green, and blue liquid crystal array is obtained on the substrate, where each color includes arrays with two different chirality. Finally, a columnar lens film is attached to the substrate to refract light of different chirality into the left and right eyes to achieve the naked-eye 3D display effect.

[0056] The present invention has the following advantages:

[0057] This invention designs and manufactures injection holes and alignment marks on a substrate, enabling simultaneous injection of multiple material solutions and simultaneous growth of microarrays using a single inkjet printing process. This significantly improves the fabrication efficiency of the microarrays, and the alignment marks ensure the regularity of the fabricated array. After solution injection, due to the confinement effect of the silicon pillars, different solutions do not enter the grooves and interfere with each other. Driven by capillary forces, the solutions form capillary liquid bridges between the substrate and the silicon pillars, and the microarrays are assembled under the induction of these liquid bridges. The advantage of this method for fabricating liquid crystal microarrays is that the array size can be controlled by the silicon pillar template size controlled by photolithography, and high resolution can be obtained. Moreover, this liquid bridge-induced crystallization method has strong universality and is suitable for the integration of three-primary-color liquid crystal microarrays in naked-eye 3D display technology. The processing precision of the three-primary-color optical micro-single-crystal array of this invention can be controlled by the size of the silicon pillars, reaching a precision of 1µm. It also has the advantages of high efficiency and large-area processing, providing a new approach for fabricating three-primary-color optical patterned arrays and applying them to the field of 3D displays. Attached Figure Description

[0058] Figure 1 This is a flowchart of a method for fabricating an optical liquid crystal array for a three-primary-color naked-eye 3D display;

[0059] Figure 2 This is a schematic diagram of a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display, which utilizes inkjet printing to inject solution through a circular hole and finally obtain a red, green, and blue three-primary-color microarray on a substrate.

[0060] Figure 3 This is a schematic diagram of a method for fabricating an optical liquid crystal array for a three-color naked-eye 3D display, showing a three-color liquid crystal microarray with different chiralities obtained on a substrate.

[0061] Figure 4 This is a schematic diagram showing a method for fabricating an optical liquid crystal array for a three-color naked-eye 3D display, in which a cylindrical lens is covered on a three-color liquid crystal microarray substrate.

[0062] Figure 5 This is a schematic diagram of the effect of a naked-eye 3D display device prepared by a method for preparing an optical liquid crystal array for a three-primary-color naked-eye 3D display.

[0063] Figure label:

[0064] 1. Silicon pillar template; 11. Silicon pillar template body; 12. Silicon pillar array; 121. Silicon pillar; 13. First alignment mark; 2. Substrate; 21. Substrate body; 22. Injection hole; 23. Second alignment mark. Detailed Implementation

[0065] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0066] Example 1

[0067] like Figures 1-2 As shown, a method for fabricating a three-primary-color naked-eye 3D display optical liquid crystal array includes the following steps:

[0068] S1. Prepare a silicon pillar template 1. The silicon pillar template 1 includes a silicon pillar template body 11, a silicon pillar array 12 arranged on the upper part of the silicon pillar template body 11, and a first alignment mark 13 arranged on the silicon pillar template body 11. The silicon pillar array 12 includes at least two silicon pillars 121 arranged in an array. The silicon pillars 121 have the same height. The top of the silicon pillars 121 is hydrophilic and the sidewalls are hydrophobic.

[0069] A substrate 2 is prepared, which includes a substrate body 21 and a liquid injection hole 22 and a second alignment mark 23 disposed on the substrate body 21. The liquid injection hole 22 is a through hole and has the same number of rows as the silicon pillar 121.

[0070] The number of columns of the silicon pillar array 12 is an integer multiple of 6, each column of the silicon pillar array 12 includes at least two silicon pillars 121, the silicon pillar array 12 is a linear array, and the substrate 2 is plasma-modified;

[0071] The silicon pillar template 1 is prepared by photolithography. Photoresist is coated on the wafer, and the structure of silicon pillar 121 is etched under a mask using ultraviolet light. Then, deep reactive ion etching is used to further etch the photolithographic structure to obtain the silicon pillar template 1.

[0072] The injection holes 22 are fabricated using photolithography and reactive ion etching. The injection holes 22 are circular holes, and the spacing and period of the injection holes 22 are the same as those of the silicon pillars 121.

[0073] The first alignment mark 13 and the second alignment mark 23 are both prepared by photolithography. The first alignment mark 13 is set at the corner of the silicon pillar template body 11, and the second alignment mark 23 is set at the corner of the substrate body 21. Both the first alignment mark 13 and the second alignment mark 23 are cross-shaped.

[0074] The substrate 21 can be any of the following: glass sheet, indium tin oxide conductive glass, quartz sheet, silicon dioxide sheet, silicon wafer, polyethylene terephthalate, and polyimide;

[0075] After substrate 2 is prepared, it is modified in ozone plasma for 5–15 min;

[0076] Each silicon pillar 121 has a length of 5–20 μm, a width of 1–5 μm, and a height of 20–30 μm. The spacing between each silicon pillar 121 in each row is 10–100 μm, and the spacing between each silicon pillar 121 in each column is 1–3 μm.

[0077] S2. Under a microscope with a three-dimensional moving platform, the substrate 2 is placed over the silicon pillar array 12 and the first alignment mark 13 and the second alignment mark 23 are in the same position. The injection hole 22 is set above the starting end of each column of silicon pillars 121.

[0078] S3. Simultaneously inject liquid crystal precursor solution into each injection hole 22. The liquid crystal precursor solution includes a left-handed or right-handed chiral additive. The liquid crystal precursor solution flows into the top of the substrate 2 and the silicon pillar 121 to form a capillary bridge. The substrate 2, the capillary bridge and the silicon pillar 121 form a sandwich structure.

[0079] Six liquid crystal precursor solutions were injected simultaneously into six adjacent injection holes 22 in sequence. The liquid crystal precursor solutions were: red left-handed liquid crystal precursor solution, red right-handed liquid crystal precursor solution, green left-handed liquid crystal precursor solution, green right-handed liquid crystal precursor solution, blue left-handed liquid crystal precursor solution and blue right-handed liquid crystal precursor solution.

[0080] The liquid crystal precursor solution is simultaneously injected into the injection hole 22 using inkjet printing, and the liquid crystal precursor solution is transferred only between each column of silicon pillars 121.

[0081] The liquid crystal precursor solution includes liquid crystal molecules, chiral molecules, organic fluorescent dye molecules and solvents, and the concentrations of the liquid crystal precursor solutions are all the same and range from 1 to 100 mg / mL.

[0082] The liquid crystal molecule can be any of the following: nematic liquid crystal molecule, smectic liquid crystal molecule, cholesteric liquid crystal molecule, and disk-type liquid crystal molecule;

[0083] The structure of the liquid crystal molecule is any one of the following: biphenyl nitrile liquid crystal molecule structure, ester liquid crystal molecule structure, cyclohexylbiphenyl liquid crystal molecule structure, pyrimidine ring liquid crystal molecule structure, ethyl bridging liquid crystal molecule structure, olefin-terminated liquid crystal molecule structure, and fluorinated benzene ring liquid crystal molecule structure.

[0084] Chiral molecules are introduced into the liquid crystal precursor solution via chiral additives;

[0085] Solvents include nonpolar solvents and polar solvents. Nonpolar solvents are made of esters, aromatic hydrocarbons, or hydrocarbons.

[0086] The molecular structure of biphenyl nitrile liquid crystals is any one of the following: 2-cyanobiphenyl liquid crystal molecular structure, 4-cyanobiphenyl liquid crystal molecular structure, 4-propyl-4'-cyanobiphenyl liquid crystal molecular structure, pentylbiphenyl nitrile liquid crystal molecular structure, hexylbiphenyl nitrile liquid crystal molecular structure, heptylbiphenyl nitrile liquid crystal molecular structure, and octylbiphenyl nitrile liquid crystal molecular structure.

[0087] The ester liquid crystal molecule structure is any one of the following: cholesterol benzoate liquid crystal molecule structure and benzoate liquid crystal molecule structure;

[0088] The cyclohexylbiphenyl liquid crystal molecule structure is a 4,4'-dialkyl-substituted cyclohexylbiphenyl liquid crystal molecule structure;

[0089] The molecular structure of oxygen-containing heterocyclic benzene liquid crystals is a dibenzofuran-containing oxygen-containing heterocyclic liquid crystal molecular structure;

[0090] The liquid crystal structure of the pyrimidine ring molecule is 4,4'-bis(5-propylpyrimidine)biphenyl liquid crystal molecule structure;

[0091] The liquid crystal structure of diphenylacetylene molecules is a cyclohexyldiphenylacetylene liquid crystal molecule structure.

[0092] The ethyl-bridged liquid crystal structure is 1-(4-n-alkylcyclohexyl)-2-[4-(4-n-alkylcycloethyl)phenyl]) liquid crystal molecule structure;

[0093] The chiral additive is any one of the following: R / S1011, R / S2011, R / S5011, R / S811, CB15 and ZLI4572;

[0094] The organic fluorescent dye molecule is any one of the following: coumarin, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylamino)-4H-pyran (DCM), methylene pyrrole, oligostyrene dyes (o-MSB), and quinoxaline derivatives;

[0095] The nonpolar solvent is any one of the following: toluene, chlorobenzene, o-dichlorobenzene, m-xylene, carbon tetrachloride, carbon disulfide, n-hexane, and n-octane;

[0096] The polar solvent is any one of the following: DMF, DMSO, dichloromethane, alcohols, aldehydes, and water;

[0097] The height of the capillary bridge is controlled by adjusting the external stress applied to the substrate 2, thereby controlling the thickness of the liquid crystal molecule array.

[0098] S4. The sandwich structure is placed in a vacuum oven and heated. The capillary bridge shrinks under the action of unidirectional capillary force. After the solvent of the capillary bridge evaporates completely, a liquid crystal array is obtained on the upper surface of the substrate 2. The chirality of two adjacent liquid crystal arrays is opposite.

[0099] like Figure 3 As shown, the liquid crystal array consists of red left-handed liquid crystal pixels, red right-handed liquid crystal pixels, green left-handed liquid crystal pixels, green right-handed liquid crystal pixels, blue left-handed liquid crystal pixels, and blue right-handed liquid crystal pixels in sequence.

[0100] The maximum temperature of the vacuum oven heating shall not exceed the boiling point of the solvent in the liquid crystal precursor solution;

[0101] S5, such as Figure 4 As shown, under the control of the micro-operation platform, the cylindrical lens film 3 is pasted onto the liquid crystal array to obtain an optical liquid crystal array for naked-eye 3D display. The optical liquid crystal array is a three-primary-color optical array.

[0102] The columnar lens film 3 was prepared by nanoimprinting and ultraviolet curing. The columnar lens film 3 was then attached to the liquid crystal array under a microscope.

[0103] The optical liquid crystal array for the naked-eye 3D display has been successfully fabricated.

[0104] Example 2

[0105] like Figure 1 As shown, a method for fabricating a three-primary-color naked-eye 3D display optical liquid crystal array includes the following steps:

[0106] A liquid injection hole 22 and alignment mark 23 were designed and fabricated on substrate 2. Liquid was injected into the space between substrate 2 and silicon pillar 121 to form a capillary liquid bridge. Under the induction of the capillary liquid bridge, a three-primary-color optical liquid crystal microarray was prepared and crystallized, and then combined with a columnar lens film 3 for naked-eye 3D display. The advantage of this invention is that it can improve the fabrication efficiency of the three-primary-color array and significantly improve the resolution of existing three-primary-color microarrays used for display, exhibiting strong versatility. Specific operating steps will be further explained with reference to the accompanying drawings:

[0107] S1. Cover the prepared quartz substrate with periodic injection holes on top of the silicon pillar template;

[0108] S2. Under a three-dimensional alignment platform microscope, align the positions of the substrate and silicon pillar using alignment marks to ensure that the injection holes on the quartz substrate are aligned with the positions of the silicon pillars.

[0109] S3. A precursor liquid crystal solution was prepared by mixing achiral nematic liquid crystal HTG135200-100 and chiral molecules R5011 / S5011 in dichloromethane (CH2Cl2) solvent. The mass fraction ratio of liquid crystal molecules to chiral molecules was 10:1. Then, organic fluorescent dyes DCM, C6, and C500 were added to the prepared chiral liquid crystal solution. The mass fraction ratio of liquid crystal molecules, chiral molecules, and organic fluorescent dyes was 10:1:0.15. The concentration of the six precursor solutions was 10 mg / ml.

[0110] S4. Using a single inkjet printing method, inject six prepared liquid crystal precursor solutions with a concentration of 10 mg / ml into the circular hole, namely red, green, and blue primary color liquid crystal precursor solutions, wherein each color has two different chiralities (levorotatory L, dextrorotatory R) (e.g. Figure 2 (as shown);

[0111] S5. After the solution is injected through the circular hole 23, since the liquid can only move from the position with a large capillary radius to the position with a small capillary radius, the solution will not enter the groove under the action of capillary force. The solution will only form a capillary liquid bridge between the silicon pillar and the substrate, thus forming a sandwich assembly structure of silicon pillar-liquid bridge-substrate.

[0112] S6. Place the assembled sandwich structure in a vacuum oven at a suitable temperature. The capillary bridge will shrink under the action of unidirectional capillary force. After the solvent has completely evaporated, a three-color liquid crystal array will be obtained on the substrate, in which each color will have two arrays with different chiralities (e.g., Figure 3 (as shown);

[0113] S7. Using a three-dimensional moving micro-platform, align and attach a prepared columnar lens film 3 onto the three-color liquid crystal microarray substrate (e.g., ...). Figure 4 As shown), a three-primary-color microarray substrate capable of realizing naked-eye 3D display was obtained. The fabricated three-primary-color optical liquid crystal array device can be applied to naked-eye 3D display technology (such as...). Figure 5 (As shown).

[0114] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for fabricating an optical liquid crystal array for a three-primary-color naked-eye 3D display, characterized in that: Includes the following steps: S1. Prepare a silicon pillar template (1). The silicon pillar template (1) includes a silicon pillar template body (11), a silicon pillar array (12) arranged on the upper part of the silicon pillar template body (11), and a first alignment mark (13) arranged on the silicon pillar template body (11). The silicon pillar array (12) includes at least two silicon pillars (121) arranged in an array. The silicon pillars (121) have the same height. The top of the silicon pillars (121) is hydrophilic and the sidewalls are hydrophobic. Prepare a substrate (2), the substrate (2) includes a substrate body (21) and a liquid injection hole (22) and a second alignment mark (23) disposed on the substrate body (21). The liquid injection hole (22) is a through hole and has the same number of columns as the silicon pillar (121). The number of columns of the silicon pillar array (12) is an integer multiple of 6, each column of the silicon pillar array (12) includes at least two silicon pillars (121), the silicon pillar array (12) is a linear array, and the substrate (2) is plasma-modified; S2. Under a microscope with a three-dimensional moving platform, the substrate (2) is placed over the silicon pillar array (12) and the first alignment mark (13) and the second alignment mark (23) are in the same position. The injection hole (22) is set above the starting end of each column of silicon pillars (121). S3. Simultaneously inject a liquid crystal precursor solution into each of the injection holes (22). The liquid crystal precursor solution includes a left-handed chiral additive or a right-handed chiral additive. The liquid crystal precursor solution flows into the top of the substrate (2) and the silicon pillar (121) to form a capillary bridge. The substrate (2), the capillary bridge and the silicon pillar (121) form a sandwich structure. The liquid crystal precursor solutions are of six types and are injected simultaneously into six adjacent injection holes (22) in sequence. The liquid crystal precursor solutions are: red left-handed liquid crystal precursor solution, red right-handed liquid crystal precursor solution, green left-handed liquid crystal precursor solution, green right-handed liquid crystal precursor solution, blue left-handed liquid crystal precursor solution and blue right-handed liquid crystal precursor solution. S4. The sandwich structure is placed in a vacuum oven and heated. The capillary bridge shrinks under the action of unidirectional capillary force. After the solvent of the capillary bridge evaporates completely, a liquid crystal array is obtained on the upper surface of the substrate (2). The chirality of two adjacent liquid crystal arrays is opposite. The liquid crystal array consists of red left-handed liquid crystal pixels, red right-handed liquid crystal pixels, green left-handed liquid crystal pixels, green right-handed liquid crystal pixels, blue left-handed liquid crystal pixels, and blue right-handed liquid crystal pixels in sequence. S5. Under the control of the micro-operation platform, the columnar lens film (3) is pasted onto the liquid crystal array to obtain an optical liquid crystal array for naked-eye 3D display. The optical liquid crystal array is a three-primary-color optical array. The optical liquid crystal array for naked-eye 3D display is now prepared.

2. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S1, the silicon pillar template (1) is prepared by photolithography. Photoresist is coated on the wafer, and the structure of the silicon pillar (121) is etched under a mask using ultraviolet light. Then, the photolithographic structure is further etched using deep reactive ion etching to obtain the silicon pillar template (1). The injection holes (22) are processed using photolithography and reactive ion etching. The injection holes (22) are circular holes. The spacing and period of the injection holes (22) are the same as those of the silicon pillars (121). The first alignment mark (13) and the second alignment mark (23) are both prepared by photolithography. The first alignment mark (13) is located at the corner of the silicon pillar template body (11), and the second alignment mark (23) is located at the corner of the substrate body (21). Both the first alignment mark (13) and the second alignment mark (23) are cross-shaped. The substrate body (21) is any one of the following: glass sheet, indium tin oxide conductive glass, quartz sheet, silicon dioxide sheet, silicon wafer, polyethylene terephthalate and polyimide.

3. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S1, after the substrate (2) is prepared, it is modified in ozone plasma for 5 to 15 minutes.

4. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S1, each silicon pillar (121) has a length of 5~20μm, a width of 1~5μm, and a height of 20~30μm. The spacing between each silicon pillar (121) in each row is 10~100μm, and the spacing between each silicon pillar (121) in each column is 1~3μm.

5. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S3, the liquid crystal precursor solution is simultaneously injected into the injection hole (22) using inkjet printing, and the liquid crystal precursor solution is transferred only between each column of silicon pillars (121).

6. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S3, the liquid crystal precursor solution includes liquid crystal molecules, chiral molecules, organic fluorescent dye molecules and solvent, and the concentrations of the liquid crystal precursor solutions are all the same and are all 1~100 mg / mL. The liquid crystal molecule is any one of the following: nematic liquid crystal molecule, smectic liquid crystal molecule, cholesteric liquid crystal molecule, and disk-shaped liquid crystal molecule; The structure of the liquid crystal molecule is any one of the following: biphenyl nitrile liquid crystal molecule structure, ester liquid crystal molecule structure, cyclohexylbiphenyl liquid crystal molecule structure, oxygen-containing heterocyclic benzene liquid crystal molecule structure, pyrimidine ring liquid crystal molecule structure, diphenylacetylene liquid crystal molecule structure, ethyl bridging liquid crystal molecule structure, olefin-terminated liquid crystal molecule structure, and fluorinated benzene ring liquid crystal molecule structure. Chiral molecules are introduced into the liquid crystal precursor solution via chiral additives; The solvents include non-polar solvents and polar solvents, and the non-polar solvents are ester solvents, aromatic hydrocarbon solvents, or hydrocarbon solvents.

7. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 6, characterized in that: The biphenyl nitrile liquid crystal molecule structure is any one of the following: 2-cyanobiphenyl liquid crystal molecule structure, 4-cyanobiphenyl liquid crystal molecule structure, 4-propyl-4'-cyanobiphenyl liquid crystal molecule structure, pentylbiphenyl nitrile liquid crystal molecule structure, hexylbiphenyl nitrile liquid crystal molecule structure, heptylbiphenyl nitrile liquid crystal molecule structure, and octylbiphenyl nitrile liquid crystal molecule structure. The ester-based liquid crystal molecule structure is any one of the following: cholesterol benzoate liquid crystal molecule structure and benzoate liquid crystal molecule structure; The cyclohexylbiphenyl liquid crystal molecule structure is a 4,4'-dialkyl-substituted cyclohexylbiphenyl liquid crystal molecule structure; The oxygen-containing heterocyclic benzene liquid crystal molecule structure is a dibenzofuran-containing oxygen-containing heterocyclic liquid crystal molecule structure; The pyrimidine ring liquid crystal molecule structure is a 4,4'-bis(5-propylpyrimidine)biphenyl liquid crystal molecule structure; The diphenylacetylene-based molecular liquid crystal structure is a cyclohexyldiphenylacetylene liquid crystal molecular structure. The ethyl-bridged liquid crystal structure is a 1-(4-n-alkylcyclohexyl)-2-[4-(4-n-alkylcycloethyl)phenyl]) liquid crystal molecule structure; The chiral additive is any one of the following: R / S1011, R / S2011, R / S5011, R / S811, CB15 and ZLI4572; The organic fluorescent dye molecule is any one of the following: coumarin, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylamino)-4H-pyran (DCM), methylene pyrrole, oligostyrene dyes (o-MSB), and quinoxaline derivatives. The nonpolar solvent is any one of the following: toluene, chlorobenzene, o-dichlorobenzene, m-xylene, carbon tetrachloride, carbon disulfide, n-hexane, and n-octane; The polar solvent is any one of the following: DMF, DMSO, dichloromethane, alcohols, aldehydes, and water.

8. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S3, the height of the capillary bridge is controlled by adjusting the external stress applied to the substrate (2), thereby controlling the thickness of the liquid crystal molecule array.

9. The method for preparing a three-primary-color naked-eye 3D display optical liquid crystal array according to claim 1, characterized in that: In step S4, the maximum temperature of the vacuum oven heating does not exceed the boiling point of the solvent in the liquid crystal precursor solution; In step S5, the columnar lens film (3) is prepared by nanoimprinting and ultraviolet curing, and the columnar lens film (3) is pasted onto the liquid crystal array under a microscope.

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