Single-layer liquid crystal reflective liquid crystal color display module

Abstract

The utility model discloses a single layer liquid crystal reflection type liquid crystal color display module, including the light absorption layer, lower base plate, red green blue three primary colors reflection type cholesteric phase liquid crystal layer that set gradually, upper base plate, be equipped with TFT electrode on the lower base plate, be equipped with the conductive indium tin oxide layer on the upper base plate, the side of containing TFT electrode on the lower base plate is set up to the up, and the red green blue three primary colors reflection type cholesteric phase liquid crystal layer includes a plurality of polyimide isolation walls, and a micrometer level thin wall container is formed between two adjacent polyimide isolation walls, and three adjacent micrometer level thin wall containers form a group of pixel strips. The utility model discloses the display module's reflectivity is enhanced significantly, and the color reflection is more bright and beautiful, improves the viewing angle characteristic of display device, reduces the sensitivity to observation angle, improves display brightness and light utilization, realizes the systematic optimization of reflection efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a single-layer liquid crystal reflective liquid crystal color display module. Background Technology

[0002] Bistable liquid crystal display (CLC) technology, a type of reflective liquid crystal display, boasts significant advantages such as full-color flexible display, high reflective brightness, high contrast, and low power consumption. However, its high cost limits its application in the color display field. Therefore, the challenge lies in developing single-layer, low-cost color display technologies, focusing on overcoming the industry's technological shortcomings in liquid crystal materials and manufacturing processes. Display products made with cholesteric liquid crystal materials possess excellent bistable characteristics and a wide operating temperature range. Therefore, they consume no energy in display mode and can be controlled to display or not display via electric fields or pressure. Currently, full-color displays on the market are achieved by stacking three layers of cholesteric liquid crystals—reflective red (R), green (G), and blue (B). This strategy results in complex and costly color CLC displays. Therefore, it is necessary to investigate how to reduce the production cost of CLC reflective displays, overcome various production technology obstacles, and develop novel liquid crystal color display structures. Utility Model Content

[0003] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a single-layer liquid crystal reflective liquid crystal color display module, which includes, from bottom to top, a light-absorbing layer, a lower substrate with TFT electrodes on the upper surface, a red, green and blue three-primary-color reflective cholesteric liquid crystal layer, and an upper substrate with a conductive indium tin oxide layer on the lower surface.

[0004] The light-absorbing layer is made of any one of black ink, black film, or black film with double-sided adhesive.

[0005] The lower substrate is glass with TFT electrodes, a polyethylene terephthalate film with TFT electrodes, or flexible PMMA acrylic glass with TFT electrodes. The upper substrate is glass with a conductive indium tin oxide layer, a polyethylene terephthalate film with a conductive indium tin oxide layer, or flexible PMMA acrylic glass with a conductive indium tin oxide layer.

[0006] The red, green, and blue tri-color reflective cholesteric liquid crystal layer includes several uniformly distributed polyimide isolation walls. A micrometer-level container is formed between two adjacent polyimide isolation walls. Every three adjacent micrometer-level containers form a pixel strip. In each pixel strip, one micrometer-level container contains a chiral compound and reflective red cholesteric liquid crystal, another micrometer-level container contains a chiral compound and reflective green cholesteric liquid crystal, and the last micrometer-level container contains a chiral compound and reflective blue cholesteric liquid crystal.

[0007] An encapsulation film is provided between the red, green and blue three-primary-color reflective cholesteric liquid crystal layer and the upper substrate.

[0008] The polyimide isolation wall has a height of 0.3-20 micrometers, a width of 0.3-20 micrometers, and a spacing of 2-120 micrometers between adjacent polyimide isolation walls. The polyimide isolation walls are bonded to the upper substrate and the lower substrate.

[0009] The fabrication process of a single-layer liquid crystal reflective liquid crystal color display module includes the following steps:

[0010] Step 1: Coat the polyimide photosensitive adhesive evenly on the side of the lower substrate with the TFT electrode, then dry it to remove the solvent, and use mask I to polymerize it under ultraviolet light to form several uniformly distributed polyimide isolation walls on the lower substrate.

[0011] Step 2: Transfer the lower substrate to the developer and develop it for a period of time to remove the unpolymerized polyimide photosensitive emulsion. After taking it out, rinse the lower substrate to remove the developer and impurities. Then rinse it with the rinsing solution to remove the solvent, and obtain a lower substrate with a uniform and highly regular polyimide isolation wall.

[0012] The area formed by four adjacent polyimide isolation walls on the lower substrate is defined as an RGB pixel. The area between the first and second polyimide isolation walls is called the red pixel R, the area between the second and third polyimide isolation walls is called the green pixel G, and the area between the third and fourth polyimide isolation walls is called the blue pixel B.

[0013] Step 3: Mix 1-30 parts by weight of chiral compound, 70-98 parts by weight of organic solvent, 3-50 parts by weight of polymer or acrylate monomer, and 0-2 parts by weight of photoinitiator, and stir until homogeneous to obtain mixture 1;

[0014] A certain amount of mixture 1 is uniformly printed in the area of ​​green pixel G and in the area of ​​blue pixel B. The amount of mixture 1 printed in the area of ​​blue pixel B is greater than the amount of mixture 1 printed in the area of ​​green pixel G. The solvent is then air-dried or dried at a certain temperature. The lower substrate is then transferred to ultraviolet light for irradiation and polymerization reaction for a period of time. Thin film A is formed in the area of ​​green pixel G and thin film B is formed in the area of ​​blue pixel B. The total content of chiral compounds in thin film B is greater than the total content of chiral compounds in thin film A.

[0015] Alternatively, a certain amount of mixture 1 is uniformly coated onto the side of the lower substrate with the polyimide isolation wall, dried, and then a mask II is placed on the side of the lower substrate containing mixture 1. Mask II has several light-passing ports, each corresponding to a red pixel R, a green pixel G, and a blue pixel B. The light-passing port corresponding to red pixel R is designated as light-passing port A, the light-passing port corresponding to green pixel G is designated as light-passing port B, and the light-passing port corresponding to blue pixel B is designated as light-passing port C. The light-passing area of ​​light-passing port B is larger than that of light-passing port A, and the light-passing area of ​​light-passing port C is larger than that of light-passing port B. The lower substrate covered with mask II is polymerized under ultraviolet light for a period of time. Mask II is removed, and the lower substrate is cleaned with a developing solvent to remove unpolymerized mixture 1. Thin film I is formed in the area of ​​red pixel R, thin film II is formed in the area of ​​green pixel G, and thin film III is formed in the area of ​​blue pixel B. The unpolymerized areas of the dried mixture 1 are completely removed after development. The light-transmitting area of ​​aperture A is the smallest, and after development, the unpolymerized areas will be completely removed, thus leaving film I with the smallest area. The light-transmitting area of ​​aperture B is larger than that of aperture A, and after development, the unpolymerized areas will be completely removed, thus leaving film II with a larger area than film I. The light-transmitting area of ​​aperture C is larger than that of aperture B, and after development, the unpolymerized areas will be completely removed, thus leaving film III with the largest area. Therefore, film III has the largest total amount of polymerizable chiral compounds remaining, while film II has a larger total amount of polymerizable chiral compounds remaining than film I, which is less than the total amount of polymerizable chiral compounds remaining in film III.

[0016] Alternatively, a certain amount of mixture 1 is uniformly coated onto the side of the lower substrate with the polyimide isolation wall, dried, and then a mask II is placed on the side of the lower substrate containing mixture 1. Mask II has several light-passing ports, each corresponding to a red pixel R, a green pixel G, and a blue pixel B. The light-passing port corresponding to red pixel R is designated as light-passing port A, the light-passing port corresponding to green pixel G is designated as light-passing port B, and the light-passing port corresponding to blue pixel B is designated as light-passing port C. The light-passing area of ​​light-passing port B is smaller than that of light-passing port A, and the light-passing area of ​​light-passing port C is smaller than that of light-passing port B. The lower substrate covered with mask II is polymerized under ultraviolet light for a period of time. Mask II is then removed. Thin film I is formed in the region of red pixel R, thin film II is formed in the region of green pixel G, and thin film III is formed in the region of blue pixel B. Light-passing port A has the largest light-passing area, and polymerizable chiral compounds in the unpolymerized regions will be fixed in thin film I. The area through which light passes through aperture B is smaller than that through aperture A. After mask polymerization, the polymerizable chiral compounds in the unpolymerized areas will continue to be anchored within film II. Similarly, the area through which light passes through aperture C is smaller than that through aperture B. After mask polymerization, the polymerizable chiral compounds in the unpolymerized areas will continue to be anchored within film III. The polymerizable chiral compounds in the areas where light passes through polymerize due to ultraviolet light irradiation, forming a polymer network and losing their chiral properties. Therefore, the total amount of polymerizable chiral compounds remaining in film III is the largest, while the total amount of polymerizable chiral compounds remaining in film II is greater than that in film I but less than that in film III.

[0017] Alternatively, a certain amount of mixture 1 is uniformly coated onto the side of the lower substrate with the polyimide isolation wall, dried, and polymerized under ultraviolet light for a period of time to form film 1 on the lower substrate; film 1 in the red pixel R region and the green pixel G region is etched away using an etching machine, while film 1 is retained in the blue pixel B region; again, a certain amount of mixture 1 is uniformly coated onto the side of the lower substrate with the micron-sized thin-walled container, dried, and polymerized under ultraviolet light for a period of time to form film 2 in the red pixel R and the green pixel G respectively; film 2 in the red pixel R is etched away using an etching machine, while film 2 is retained in the green pixel G, and both film 1 and film 2 are retained in the blue pixel B region. In this way, the concentration of chiral molecular compounds in film 1 is greater than that in film 2.

[0018] Step 4: Mix 1-60 parts by weight of UV-polymerizable monomer I, 70-98 parts by weight of organic solvent, and 0-2 parts by weight of initiator to obtain mixture 2. Coat mixture 2 evenly on one side of the conductive indium tin oxide layer on the upper substrate and dry to remove the solvent. Roll the upper substrate onto the lower substrate containing the thin film and TFT electrodes, and then perform a photopolymerization reaction for a period of time to obtain an unfilled liquid crystal encapsulated liquid crystal cell, wherein the side of the lower substrate with the polyimide isolation wall faces upward and the side of the upper substrate with mixture 2 faces downward.

[0019] Step 5: Mix 2-30 parts by weight of chiral compound, 5-15 parts by weight of UV-polymerizable monomer II, 0.5-2 parts by weight of photoinitiator, and 70-95 parts by weight of phase-phase liquid crystal to obtain a parent liquid crystal mixture; drop the parent liquid crystal mixture onto one side of the unfilled encapsulation box to draw the parent liquid crystal mixture into the encapsulation box and fill the entire encapsulation box; diffuse for 1-30 minutes to reach diffusion equilibrium, and then irradiate with UV light for 1-30 minutes.

[0020] Step 6: Apply black ink, black adhesive film, or black film to the side of the lower substrate without TFT electrodes to form a light-absorbing layer, and finally obtain a single-layer liquid crystal reflective liquid crystal color display module.

[0021] The chiral compound is composed of

[0022] , , , , , , , , , , , , Any one or more of the following components;

[0023] The organic solvent is one or more of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, methanol, ethanol, isopropanol, dichloromethane, chloroform, tetrachloromethane, acetone, diethyl ether, petroleum ether, n-hexane, benzene, tetrahydrofuran, ethyl acetate, acetonitrile, toluene, phenol, and anisole.

[0024] The photoinitiator is one or more of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, bis(1-(2,4-difluorophenyl)-3-pyrrolithium)dicenzolide, 2-isopropylthioxanthone, methyl o-benzoylbenzoate, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

[0025] The polymer is one or more of the following: polyvinylpyrrolidone, polyvinyl alcohol, riboglycol, polylactic acid, polycaprolactone, polymethyl methacrylate, and dipentaerythritol hexaacrylate.

[0026] The ultraviolet-polymerizable monomer I is one or more of the following: JT-1000, RFJ-220-60, dipentaerythritol-hexaacrylate, ethyl 2-(4-benzoylphenoxy)-2-methylprop-2-enoate, methyl isocyanate, phenyl isocyanate, diisocyanate, polytetrahydrofuranol, polyethylene glycol (100-1000), triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, ethylene glycol acetoacetate methacrylate, bisphenol A methacrylate diester, 2-phenoxyethyl acrylate, trimethylolpropane trimethacrylate, octadecyl methacrylate, tetraethylene glycol diacrylate, 1,4-bis-[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, and 2-methyl-1,4-phenylenebis(4-(((4-(acryloyloxy)butoxy)carbonyl)oxy)benzoic acid;

[0027] The ultraviolet-polymerizable monomer II is one or more of the following: isobornyl methacrylate, butyl acrylate, 1,6-hexanediol acrylate, 1,4-butanediol acrylate, phenyl acrylate, pentaerythritol tetrakis(3-mercaptopropionic acid) ester, cyclohexyl acrylate, and hydroxypropyl methacrylate.

[0028] The polyimide photosensitive adhesive is one or more of FRJ-220-60, JZ-2005, AZ4330, SU-8 2025, AZ4620, AZ9260, AZ1500, and AZ5214;

[0029] The light-absorbing layer has a transmittance of <0.1% and a specular reflectance of <1.5% in the 380-780nm wavelength range, and a light absorption efficiency of >99.9%.

[0030] The photoresist used in step two has a flash point of 10-40℃, a boiling point of 110-160℃, a density of 0.38-1.3g / cm3, and a polymerization temperature of -25-45℃.

[0031] The beneficial effects of this utility model are:

[0032] 1. Significantly enhanced reflectivity and moderately broadened half-width at half-maximum. This not only makes color reflection more vivid and bright but also improves the viewing angle characteristics of the display device, reduces sensitivity to viewing angle, and enhances display brightness and light utilization, achieving systematic optimization of reflection efficiency. Good planar texture lays the foundation for high reflectivity, reduces light scattering loss, and efficiently concentrates photon energy in the reflection band;

[0033] 2. The ratio of transmittance in the planar state to that in the isotropic state of the reflectance spectrum increases, and the continuously improving reflectance makes the displayed colors more vivid and the visual effect more outstanding, bringing users a better display experience. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the single-layer liquid crystal reflective liquid crystal color display module of this utility model;

[0035] Figure 2 This is a flowchart illustrating the fabrication process of the single-layer liquid crystal reflective liquid crystal color display module of this utility model;

[0036] Figure 3 These are polarized microscope images of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display modules prepared according to embodiments 1-7 of this utility model;

[0037] Figure 4 This is a transmittance diagram of the red, green, and blue pixels of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared in Embodiments 1-7 of this utility model;

[0038] Figure 5 These are the reflection spectra of the red, green, and blue pixels of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared in Embodiments 1-7 of this utility model;

[0039] Figure 6 This is a diagram showing the driving voltage of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared according to embodiments 1-7 of this utility model;

[0040] Figure 7 This is a contrast diagram of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared according to embodiments 1-7 of this utility model. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] Example 1

[0043] At -25 to 45°C, 4 mL of JF-2005 photosensitive emulsion was transferred onto the side of the TFT glass containing the TFT electrodes using a dropper. The TFT substrate was then placed on a constant-temperature hot plate and dried at 65°C for 1 min, followed by a further drying at 95°C for 1 min. Mask I was placed on the TFT glass containing the photolithographic layer and polymerized under UV light at an intensity of 200 mW / cm² for 30 s. The UV-polymerized TFT glass was then immersed in the matching developer (JFX-PMA type) for 5 min, removed, and rinsed in the JF-2005 matching rinsing solution (isopropanol) to remove excess developer and unpolymerized photosensitive emulsion. The TFT glass, after development, rinsing, and post-baking, was then baked at 120°C for 5 min to obtain a TFT substrate with a polyimide isolation wall height of approximately 5.5 μm.

[0044] At -25 to 45°C, 1 part by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane (supported chiral compound (9)), 18 parts by weight of polyRFJ-220-60 adhesive, and 81 parts by weight of dimethyl sulfoxide were prepared into a homogeneous solution 1. 2 parts by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 31 parts by weight of RFJ-220-60 adhesive, and 78 parts by weight of dimethyl sulfoxide were prepared into a homogeneous solution 2. Then, solution 1 was printed into a micron-sized thin-walled container for containing reflective green cholesteric liquid crystal, and solution 2 was printed into a micron-sized thin-walled container for containing reflective blue cholesteric liquid crystal. The DMSO solvent was evaporated at 45°C to remove the solvent, resulting in a TFT thin-walled substrate containing RFJ-220-60 and the chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, respectively, in both the green and blue cholesteric liquid crystal containers. The content of the chiral compound in the green cholesteric liquid crystal container was less than that in the blue cholesteric liquid crystal container.

[0045] At -25 to 45 °C, 18 parts by weight of photopolymer JT-1000, 80 parts by weight of dichloromethane, and 2 parts by weight of initiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide were stirred to obtain a homogeneous solution. The mixture containing the photopolymer monomers was coated onto a PET film containing an ITO layer. The PET film containing JT-1000 and a TFT film substrate containing RFJ-220-60-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane were rolled to prepare a liquid crystal encapsulation cell. Then, the solvent was removed by drying at 60 °C. After drying, the encapsulation cell was obtained by polymerization at a light intensity of 0.3-200 mW / cm² for 600 s.

[0046] At -25 to 45°C, 2.3 parts by weight of the chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 2 parts by weight of the UV-polymerizable monomer ethyl 2-(4-benzoylphenoxy)2-methylprop-2-enoate, 2 parts by weight of 2-phenoxyethyl acrylate, 2 parts by weight of 1,4-bis-[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts by weight of isobornyl methacrylate, 0.5 parts by weight of the photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 91.2 parts by weight of the phase-array liquid crystal SLC-1717 were uniformly mixed to obtain a red-reflective parent liquid crystal mixture. A vacuum pump was turned on, and the parent liquid crystal mixture was dropped onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture was drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation cell, diffuses at 35°C for 10 minutes, and is irradiated with ultraviolet light for 5-30 minutes. A black adhesive film of polyimide or polyester is attached to the side of the lower substrate without a conductive indium tin oxide layer to form a light-absorbing layer. The final product is a single-layer liquid crystal reflective color display module.

[0047] Example 2

[0048] Step 1: At -25 to 45 ℃, use a dropper to transfer 3.5 mL of photoresist RFJ-220-60 onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then transferred to a constant-temperature stage at 165 ℃ and baked for 2 min. Next, a mask with a pixel pitch of 10 μm is placed on the TFT glass containing the photoresist layer and polymerized under ultraviolet light at an intensity of 400 mW / cm² for 4 s. The mask is then removed, and the TFT glass is placed in a developer solution (negative photoresist developer RFX-2272) containing RFJ-220-60 for development. It is then immersed in a rinsing solution (RFP-2202) for 5 min to remove excess developer (RFX-2272) and unpolymerized photoresist (RFJ-220-60). The TFT glass, after development, rinsing, and post-baking, was baked at 120 °C for 5 min to obtain TFT glass with a photolithographic wall height of approximately 3 μm (e.g., Figure 1 (As shown).

[0049] Step 2: At -25 to 45 °C, prepare a homogeneous solution 1 by weight of 1 part of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 2 parts of polymethacrylate, and 97 parts of methanol / dichloromethane = 1 / 1. Prepare a homogeneous solution 2 by weight of 2 parts of chiral compound (9), 4 parts of polymethacrylate, and 94 parts of methanol / dichloromethane = 1 / 1. Then, print solution 1 in the green pixel and solution 2 in the blue pixel, and evaporate the solvent at 45 °C to obtain a TFT thin film substrate containing polymethacrylate-loaded chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in the green and blue pixels.

[0050] Step 3: At -25-45 ℃, mix 30 parts by weight of dipentaerythritol hexaacrylate (DPHA), 68 parts by weight of a mixed organic solvent of methanol / dichloromethane (1 / 1), and 2 parts by weight of an initiator. After stirring evenly, a mixture solution is obtained. The mixture containing the photopolymerizable monomer DPHA is coated onto a PET film containing an ITO layer. The PET film containing dipentaerythritol hexaacrylate and a TFT film substrate containing polymethyl methacrylate-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane are rolled to prepare a packaging box. Then, the solvent is removed by drying at 60 ℃. After drying, the package is polymerized for 480 s under light intensity of 0.3-600 mw / cm2 to obtain the packaged packaging box.

[0051] Step 4: At -25-45℃, uniformly mix 2.3 parts by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 2 parts of JT-1000, 2 parts of dipentaerythritol-hexaacrylate, 2 parts of phenyl isocyanate, 2 parts of neopentyl glycol dimethacrylate, 0.5 parts of photoinitiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 91.2 parts of phase-phase liquid crystal to obtain a red-reflective parent liquid crystal mixture. Turn on the vacuum pump and drop the parent liquid crystal mixture onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture filled the entire encapsulation box, diffused at 35 ℃ for 10 min, and then irradiated with ultraviolet light for 10 min to obtain a single-layer liquid crystal reflective color display module.

[0052] Example 3

[0053] Step 1: At -25 to 45 °C, use a dropper to transfer 5.5 mL of photosensitive adhesive JZ-305 onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then placed on a constant-temperature hot stage and baked at 100 °C for 2.5 min. Next, a mask with a pixel pitch of 12 μm is placed on the TFT glass containing the photoresist layer and polymerized under ultraviolet light with an intensity of 450 mW / cm² for 1.5 min. The polymerized TFT glass is then developed in dichloromethane for 3.5 min, removed, and rinsed in an ethanol solution of JZ-305 rinsing solution to remove excess developer and impurities. The TFT glass, after development, rinsing, and post-baking, is then baked at 120 °C for 5 min to obtain TFT glass with a photoresist wall height of approximately 2.8 μm.

[0054] Step 2: At -25-45 ℃, prepare a homogeneous solution 1 by weight of 1 part of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 2 parts of polyvinylpyrrolidone / dipentaerythritol hexaacrylate mixed adhesive, and 60 parts of tetrahydrofuran / DMSO=1 / 4. Prepare a homogeneous solution 2 by weight of 1 part of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 2 parts of polyvinylpyrrolidone / dipentaerythritol hexaacrylate mixed adhesive, and 30 parts of tetrahydrofuran / DMSO=1 / 4. Then, solution 1 was printed in the green pixel and solution 2 was printed in the blue pixel. The tetrahydrofuran / DMSO=1 / 4 solvent was evaporated at 60 °C to obtain a TFT thin film substrate containing RFJ-220-60 loaded chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in the green and blue pixels.

[0055] Step 3: At -25-45 ℃, mix 25 parts by weight of photopolymerizable sealing adhesive JZ-2005, 73 parts by weight of organic solvent, and 2 parts by weight of initiator. After stirring evenly, a mixture solution is obtained. The mixture containing the photopolymerizable monomers is coated onto a PET film containing an ITO layer. The PET film containing JZ-2005 and the TFT film substrate containing polyvinylpyrrolidone / dipentaerythritol hexaacrylate film loaded with the chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane are rolled to prepare a packaging box. Then, the solvent is removed by drying at 60 ℃. After drying, the package is polymerized for 600 s under a light intensity of 0.3-200 mW / cm2 to obtain the packaged packaging box.

[0056] Step 4: At -25-45 ℃, 2.3 parts by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 6 parts by weight of UV-polymerizable monomer, 0.5 parts by weight of photoinitiator, and 94 parts by weight of phase-phase liquid crystal are uniformly mixed to obtain a parent liquid crystal mixture with a reflective red color. A vacuum pump is turned on, and the parent liquid crystal mixture is dropped onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box. After diffusion at 35 ℃ for 10 min, it is irradiated with UV light of wavelength 254-395 nm and intensity 0.3-100 mW / cm² for 8.5 min to obtain a single-layer liquid crystal reflective color display module.

[0057] Example 4

[0058] Step 1: At -25-45 ℃, use a dropper to transfer 5 mL of RFJ-210 photosensitive adhesive onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then placed on a constant-temperature hot stage and baked at 105 ℃ for 2 min. Next, a mask with a pixel pitch of 10 μm is placed on the TFT glass containing the photolithographic layer and polymerized for 15 s under ultraviolet light with a wavelength of 254-395 nm and an irradiance of 200 mW / cm². The polymerized TFT glass is then immersed in a developing solution for 3.5 min, removed, and rinsed in the RFJ-210-compatible rinsing solution to remove excess developing solution and unpolymerized photosensitive adhesive. Finally, the TFT glass, after development, rinsing, and post-baking, is baked at 135 ℃ for 10 min to obtain a TFT glass with a photolithographic wall.

[0059] Step 2: At -25-45℃, prepare a homogeneous solution 1 by weight of 1 part of chiral compound (S)-4-(4-octylphenoxy)-2-fluorobenzoate, 1 part of polymethacrylate, 2 parts of RFJ-220-60, and 30 parts of dichloromethane / ethanol / anisole in a mass ratio of 1 / 1 / 1. Prepare a homogeneous solution 2 by weight of 2 parts of chiral compound (13BR)-5,6-dihydro-5-(trans-4-propylcyclohexyl)-4H-dinaphtho[2,1-F:1',2'-H][1,5]dioxane-nonatetraene, 4 parts of RFJ-220-60, and 94 parts of dichloromethane / ethanol / anisole in a mass ratio of 1 / 1 / 1. Then, solution 1 was printed in the green pixel and solution 2 was printed in the blue pixel. The dichloromethane / ethanol / anisole = 1 / 1 / 1 solvent was evaporated at 45 °C to obtain a TFT thin film substrate containing RFJ-220-60 / polymethyl methacrylate-loaded chiral compound (S)-4-(4-octylphenoxy)-2-fluorobenzoate in the green and blue pixels.

[0060] Step 3: At -25-45 ℃, mix 10 parts by weight of the photopolymerizable monomer dipentaerythritol hexaacrylate, 10 parts of PEGD-1000 polymerizable monomer, 20 parts of isobornyl methacrylate, 2 parts of initiator, and 48 parts of dichloromethane. After stirring evenly, a mixture solution is obtained. The mixture containing the above photopolymerizable monomers is coated onto a PET film containing an ITO layer. The PET film and a TFT film substrate containing RFJ-220-60 / polymethacrylate-supported chiral compound (S)-4-(4-octylphenoxy)-2-fluorobenzoate are rolled to prepare a packaging box. Then, the solvent is removed by drying at 55 ℃. After drying, the package is polymerized for 600 s under a light intensity of 200 mW / cm2 to obtain the packaged packaging box.

[0061] Step 4: At -25-45℃, 2.3 parts by weight of chiral compound (9), 1 part of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts of isobornyl methacrylate, 2 parts of 1,4-butanediol acrylate, 1 part of pentaerythritol tetrakis(3-mercaptopropionic acid), 0.5 parts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 88 parts of phase-phase liquid crystal are uniformly mixed to obtain a parent liquid crystal mixture with a reflective red color. The vacuum pump is turned on, and the parent liquid crystal mixture is dropped onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after sufficient diffusion at 25-40℃ for 10 min, it is irradiated with ultraviolet light for 5-30 min to obtain a single-layer liquid crystal reflective color display module.

[0062] Example 5

[0063] Step 1: At -25-45 ℃, use a dropper to transfer 5 mL of photosensitive AZ4620 onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then placed on a constant-temperature hot plate and baked at 120 ℃ for 1.5 min. Next, a mask with a pixel pitch of 20 μm is placed on the TFT glass containing the photolithographic layer and polymerized for 120 s under ultraviolet light with a wavelength of 254-395 nm and an irradiance of 200 mW / cm². The polymerized TFT glass is then immersed in the matching developer solution CD-26 for 4.5 min, removed, and placed in the AZ4620 matching rinsing solution NMP4L to wash away excess developer and unpolymerized photosensitive adhesive. The TFT glass, after development, rinsing, and post-baking, is then baked at 110 ℃ for 10 min to obtain a TFT glass with a photolithographic wall (e.g., ...). Figure 1 (As shown).

[0064] Step 2: At -25-45 ℃, prepare a homogeneous solution 1 by weight of 2 parts of chiral compound (S)-2-(4-octylphenyl)-4-(4-hydroxyphenyl)-2-fluoro-1,3-dioxane, 4 parts of polymethacrylate, 2 parts of polyvinylpyrrolidone, and 92 parts of toluene / anisole / dimethyl sulfoxide in a mass ratio of 1 / 1 / 1. Also prepare a homogeneous solution 1 by weight of 4 parts of chiral compound (S)-2-(4-octylphenyl)-4-(4-hydroxyphenyl)-2-fluoro-1,3-dioxane, 8 parts of polymethacrylate, and 3.5 parts of polyvinylpyrrolidone. 40 parts by mass of toluene / anisole / dimethyl sulfoxide (DMSO) were mixed to form a homogeneous solution 2. Solution 1 was then printed into the green pixel, and solution 2 into the blue pixel. The toluene / anisole / DMSO solvent was evaporated at 45°C to remove the solvent, resulting in a TFT thin film substrate containing RFJ-220-60 / polymethyl methacrylate-supported chiral compound (S)-2-(4-octylphenyl)-4-(4-hydroxyphenyl)-2-fluoro-1,3-dioxane (e.g., ) within the green and blue pixels. Figure 1 (As shown).

[0065] Step 3: At -25-45℃, mix 10 parts by weight of the photopolymerizable monomer dipentaerythritol hexaacrylate, 10 parts of 2-phenoxyethyl acrylate monomer, 20 parts of octadecyl methacrylate, 2 parts of the initiator (2,4,6-trimethylbenzoyl) diphenylphosphine oxide, and 48 parts of dichloromethane. After stirring until homogeneous, obtain a mixture solution. Coat the mixture containing the above photopolymerizable monomers onto a PET film containing an ITO layer. Roll-press the PET film and a TFT film substrate containing RFJ-220-60 / polymethacrylate-supported chiral compound (S)-2-(4-octylphenyl)-4-(4-hydroxyphenyl)-2-fluoro-1,3-dioxane to prepare a packaging box. Then, dry at 40℃ to remove the solvent. After drying, polymerize under light intensity of 0.3-200 mW / cm2 for 600 s to obtain the packaged packaging box.

[0066] Step 4: At -25-45 ℃, 2.3 parts by weight of chiral compound (10), 2 parts by weight of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 1 part by weight of phenyl acrylate, 2 parts by weight of 1,6-hexanediol acrylate, 1 part by weight of pentaerythritol tetrakis(3-mercaptopropionic acid), 0.5 parts by weight of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 90 parts by weight of phase-array liquid crystal SLC-1717 are uniformly mixed to obtain a parent liquid crystal mixture with a reflective red color. The vacuum pump is turned on, and the parent liquid crystal mixture is dropped onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after sufficient diffusion at 25-40 ℃ for 10 min, it is irradiated with ultraviolet light for 5-30 min to obtain a single-layer liquid crystal reflective color display module.

[0067] Example 6

[0068] Step 1: At -25-45℃, use a dropper to transfer 3 mL of photosensitive AZ9260 onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then placed on a constant-temperature hot stage and baked at 135℃ for 2.5 min. Next, a mask with a pixel pitch of 18 μm is placed on the TFT glass containing the photolithographic layer and polymerized for 15 s under ultraviolet light with a wavelength of 254-395 nm and an irradiance of 200 mW / cm². The polymerized TFT glass is then immersed in the matching developer solution for development. After soaking in the developer solution for 5 min, it is removed and placed in the AZ9260 matching rinsing solution to wash away excess developer and unpolymerized photosensitive adhesive. The TFT glass, after development, rinsing, and post-baking, is then baked at 150℃ for 6.5 min to obtain a TFT glass with a photolithographic wall.

[0069] Step 2: At -25-45 ℃, prepare a homogeneous solution 1 by mixing 15 parts by weight of chiral compound (S)-2-(4-octylphenoxy)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 30 parts by weight of polymethacrylate, and 100 parts by weight of dichloromethane / ethanol = 1 / 1. Prepare a homogeneous solution 2 by mixing 30 parts by weight of chiral compound (S)-2-(4-octylphenoxy)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 60 parts by weight of polymethacrylate, and 100 parts by weight of dichloromethane / ethanol = 1 / 1. Then, solution 1 was printed in the green pixel and solution 2 was printed in the blue pixel. The methane / ethanol = 1 / 1 solvent was evaporated at 65 °C to remove the solvent, resulting in a TFT thin film substrate containing a polymethacrylate-supported chiral compound (S)-2-(4-octylphenoxy)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester in both the green and blue pixels (e.g., ...). Figure 1 (As shown).

[0070] Step 3: At -25-45 ℃, mix 30 parts by weight of the photopolymerizable monomer ethylene glycol acetoacetate methacrylate or bisphenol A methacrylate diester, 10 parts by weight of 1,4-bis-[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene monomer, 20 parts by weight of pentaerythritol tetrakis(3-mercaptopropionic acid) ester, 2 parts by weight of initiator (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 30 parts by weight of dichloromethane. After stirring evenly, a mixture solution is obtained. Coat the mixture containing the above photopolymerizable monomers onto a PET film containing an ITO layer. A PET film and a TFT film substrate containing a loaded chiral compound (S)-2-(4-octylphenoxy)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester were rolled together to prepare a packaging box. Then, the solvent was removed by drying at 40 °C. After drying, the packaged box was polymerized for 600 s under light intensity of 0.3-200 mW / cm2.

[0071] Step 4: At -25-45 ℃, 2.3 parts by weight of chiral compound (9), 1 part of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts of isobornyl methacrylate, 2 parts of 1,4-butanediol acrylate, 1 part of pentaerythritol tetrakis(3-mercaptopropionic acid), 0.5 parts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 90 parts of phase-phase liquid crystal are uniformly mixed to obtain a parent liquid crystal mixture with a reflective red color. The vacuum pump is turned on, and the parent liquid crystal mixture is dropped onto one side of the encapsulation box. Under the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after sufficient diffusion at 25-40 ℃ for 10 min, it is irradiated with ultraviolet light for 5-30 min to obtain a single-layer liquid crystal reflective color display module.

[0072] Example 7

[0073] Step 1: At -25 to 45 ℃, use a dropper to transfer 5 mL of photoresist AZ5214 onto the TFT glass to obtain a TFT substrate containing a photoresist film. The TFT substrate is then placed on a constant-temperature hot plate and dried at 120 ℃ for 2 min. Next, a mask with a pixel size and pixel pitch of 10 μm is placed on the TFT glass containing the photoresist layer and polymerized under ultraviolet light with an intensity of 300 mW / cm² for 2 min. The polymerized TFT glass is then immersed in the matching developer solution for development. After immersion in the developer solution for 3.5 min, it is removed and placed in the AZ5214 matching rinsing solution to wash away excess developer and unpolymerized photoresist. The TFT glass, after development, rinsing, and post-baking, is then baked at 115 ℃ for 3 min to obtain a TFT glass substrate with photoresist walls (e.g., ...). Figure 1 (As shown).

[0074] Step 2: At -25-45 ℃, prepare a homogeneous solution 1 by mixing 3 parts by weight of chiral compound (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 1 part of 1,6-hexanediol diacrylate, 0.5 parts of dipentaerythritol-hexaacrylate, 0.5 parts of ethylene glycol acetoacetate methacrylate, and 80 parts of a solvent of N,N-dimethylformamide / dimethyl sulfoxide / dichloromethane = 1 / 1 / 1. Then, mix 2 parts by weight of the chiral compound (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 1 part of 1,6-hexanediol diacrylate, 0.5 parts of dipentaerythritol-hexaacrylate, 0.5 parts of acetoacetate methacrylate, and 80 parts of N,N-dimethylformamide / dimethyl sulfoxide / dichloromethane = 1 / 1 / 1. A homogeneous solution 1 was prepared by mixing (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 6 parts of 1,6-hexanediol diacrylate, 0.5 parts of dipentaerythritol-hexaacrylate, 0.5 parts of ethylene glycol acetoacetate methacrylate, and 80 parts of N,N-dimethylformamide / dimethyl sulfoxide / dichloromethane = 1 / 1 / 1 solvent. Solution 1 was then printed in the green pixel, and solution 2 was printed in the blue pixel. The N,N-dimethylformamide / dimethyl sulfoxide / dichloromethane = 1 / 1 / 1 solvent was evaporated at 45 °C to obtain a TFT thin film substrate containing a polymer film-loaded chiral compound (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester in the green and blue pixels.

[0075] Step 3: At -25-45 ℃, 10 parts of 1,6-hexanediol diacrylate, 15 parts of dipentaerythritol-hexaacrylate, 10 parts of ethylene glycol acetoacetate methacrylate, and 50 parts of dichloromethane solvent, along with 2 parts of initiator (2,4,6-trimethylbenzoyl) diphenylphosphine oxide, are mixed and stirred until homogeneous to obtain a solution. The mixture containing the photopolymerizable monomers is coated onto a PET film containing an ITO layer. A PET film containing JT-1000 and a TFT film substrate containing the polymer film-supported chiral compound (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester are rolled to prepare a packaging box. Then, the solvent is removed by drying at 60 ℃. After drying, polymerization is carried out for 120 s under light intensity of 0.3-300 mW / cm2 to obtain the packaged packaging box.

[0076] Step 4: At -25-45℃, mix 6 parts by weight of chiral compound (S)-2-(4-propoxyphenyl)-4-(4-hydroxyphenyl)-1,3-dioxane-2-ester, 1 part of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts of 1,6-hexanediol diacrylate, 2 parts of 1,4-butanediol diacrylate, 1 part of pentaerythritol tetrakis(3-mercaptopropionic acid) ester, 0.5 parts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 85 parts of phase-phase liquid crystal to obtain a red-reflective parent liquid crystal mixture. Turn on the vacuum pump and drop the parent liquid crystal mixture onto one side of the encapsulation box. In the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after being fully diffused at a temperature of 25-40 ℃ for 10 minutes, it is irradiated with ultraviolet light for 5-30 minutes to obtain a single-layer liquid crystal reflective color display module.

[0077] Example 8

[0078] Step 1: At -25 to 45 ℃, use a dropper to transfer 5 mL of photosensitive emulsion FRJ-220-60 onto the TFT glass to obtain a TFT substrate containing a photosensitive emulsion film. The TFT substrate is then placed on a constant-temperature hot plate and dried at 115 ℃ for 3 min. Next, a mask with a pixel size of 15 micrometers and a pixel pitch of 2 μm is placed on the TFT glass containing the photolithography layer and polymerized under ultraviolet light with an intensity of 200 mW / cm² for 10 s. The polymerized TFT glass is then immersed in the matching developer solution for development. After immersion in the developer solution for 5 min, it is removed and placed in the rinsing solution provided with FRJ-220-60 to wash away excess developer and unpolymerized photosensitive emulsion. Finally, the TFT glass, after development, rinsing, and post-baking, is baked at 115 ℃ for 5 min to obtain a TFT glass substrate with photolithography walls.

[0079] Step 2: At -25 to 45 °C, a uniform mixed solution of 4 parts by weight of chiral molecule 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 8 parts by weight of polyvinylpyrrolidone, and 110 parts by weight of dichloromethane is dropped onto the TFT glass containing the photolithography wall. A 4-micrometer thick layer of the mixed solution is coated using a coating machine, and then dried at 60 °C for 10 min to obtain a TFT glass containing a polymer-loaded chiral molecule film and a photolithography wall.

[0080] Step 3: At -25-45 ℃, place the TFT glass containing the polymer-loaded chiral molecular film and photolithography wall in the etching area of ​​the etching machine, and etch away the polyvinylpyrrolidone-loaded R5011 film in the red and green pixel areas under the conditions of etching energy of 50% and frequency of 300Hz.

[0081] Step 4: At 20-35℃, add a mixture of polyvinylpyrrolidone (PVP) with a volume ratio of 1:6 (ethanol / dichloromethane) and a mass ratio of 100:3:1 (PVP / R5011) to the TFT glass from Step 3. Then, coat a 4-micrometer-thick layer of the mixture using a coating machine to obtain TFT glass containing PPVP-loaded R5011 in the red and green pixels. The blue pixel film has the highest content of the chiral molecule 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane.

[0082] Step 5: At 20-35℃, place the TFT glass from step 4 in the etching area of ​​the etching machine. Under the conditions of etching energy of 50% and frequency of 300Hz, the thin film of polyvinylpyrrolidone loaded with chiral molecules in the red pixel area is etched away to obtain the TFT glass for diffusion of red, green and blue pixels.

[0083] Step 6: At 20-35℃, mix 90.3 parts by weight of liquid crystal SLC1717, 2.2 parts by weight of chiral molecule S5011, 2 parts by weight of acryloyloxypropionic acid, 2 parts by weight of isobornyl methacrylate, 2.2 parts by weight of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 0.9 parts by weight of phenyl acrylate, and 0.4 parts by weight of benzoyl dimethyl ether in an ultrasonic bath for 4 hours, and then stir for 6 hours under a magnetic stirrer to obtain a uniformly mixed red parent liquid crystal.

[0084] Step 7: At -25-45 ℃, 10 parts of 1,6-hexanediol diacrylate, 15 parts of dipentaerythritol-hexaacrylate, 10 parts of ethylene glycol acetoacetate methacrylate, 50 parts of dichloromethane solvent, and 2 parts of initiator are mixed and stirred evenly to obtain a mixture solution. The mixture containing the photopolymerizable monomers is coated onto a PET film containing an ITO layer. The PET film containing JT-1000 and the TFT film substrate containing the polymer film-loaded chiral compound (3) are rolled to prepare a packaged liquid crystal cell. Then, the solvent is removed by drying at a temperature of 60 ℃. After drying, the packaged cell is polymerized for 120 s under a light intensity of 0.3-300 mW / cm2.

[0085] Step 8: At -25 - 45 °C, by weight, 2.0 parts of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphtho[2,1-F:1',2'-H][1,5]dioxetane, 1 part of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts of 1,6-hexanediol diacrylate, 1 part of 1,4-butanediol diacrylate, 2 parts of pentaerythritol tetrakis(3-mercaptopropionate), 2 parts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 83 parts of a nematic liquid crystal are uniformly mixed to obtain a parent liquid crystal mixture that reflects red color. Open the vacuum pump, and drop the parent liquid crystal mixture on one side of the encapsulation box. In the presence of the vacuum pump, the parent liquid crystal mixture is sucked into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after diffusing sufficiently for 10 min at a temperature of 25 - 40 °C, it is irradiated with ultraviolet light for 5 - 30 min to obtain a single-layer liquid crystal reflective color display module.

[0086] Example 9

[0087] Step 1: At -25 - 45 °C, use a dropper to transfer 3 mL of polyimide photosensitive resin AZ9260 onto the TFT glass, and after coating, a TFT substrate with a photoresist film is obtained. Then the TFT substrate is placed on a constant-temperature hot stage and baked at 135 °C for 2.5 min. Then, a mask with an adjacent pixel bar pitch of 2 μm and a pixel bar width of 18 μm is placed on the TFT glass with a photolithography layer, and polymerized under ultraviolet light with a wavelength of 254 - 395 nm and a light intensity of 200 mW / cm2 for 15 s. Then the TFT glass after mask polymerization is put into a supporting developer for developing operation, taken out after soaking in the developer for 5 min, placed in a rinsing solution supporting the polyimide photosensitive resin AZ9260 to wash away the excess developer and unpolymerized photosensitive resin, and then the TFT glass after development, rinsing and post-baking operations is baked at 150 °C for 6.5 min to obtain a TFT glass with polyimide isolation walls.

[0088] Step 2: At -25-45 ℃, mix 4 parts by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 8 parts by weight of polyurethane acrylate, and 92 parts by weight of toluene / anisole / dimethyl sulfoxide in a mass ratio of 1 / 1 / 1 to form a homogeneous solution 1. Then, uniformly coat a 6-micron thick layer of solution 1 onto a TFT glass containing an isolation wall, and evaporate the toluene / anisole / dimethyl sulfoxide 1 / 1 / 1 solvent at 45 ℃ to obtain a TFT thin film substrate containing polyurethane acrylate-loaded chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in red, green, and blue pixels. A mask with a 2-micrometer spacing between adjacent pixel strips and a pixel strip width of 18 micrometers was placed on a TFT film substrate after solvent coating and drying. Three consecutive, adjacent, 2-micrometer-spaced light-blocking strips on the mask were designated as regions Z, X, and V. Region Z was completely opaque, preventing ultraviolet light transmission and thus preventing the polymerization of polymerizable monomers in this region. Region X contained uniformly distributed black apertures, allowing ultraviolet light to pass through in 50% of its area. Region V was completely transparent, allowing the majority of ultraviolet light to pass through. Then, the red, green, and blue pixel strips in the TFT glass were aligned with regions Z, X, and V and polymerized under ultraviolet light at a wavelength of 254-395 nm and an intensity of 20 mW / cm² for 120 s. The polymerized TFT glass was then immersed in ethanol for 3 minutes at -25 to 60 °C to remove the polymerized polyurethane acrylate monomers. Then, the films were dried at 25-200 °C to remove ethanol, yielding films with the least amount of polyurethane acrylate-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in the red pixel strips, films with more polyurethane acrylate-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in the green pixel strips than in the red pixel strips, and films with the most polyurethane acrylate-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane in the blue pixel strips. Finally, a TFT substrate with pixel bar isolation walls of uniform and highly regular morphology and polymer-loaded chiral compound thin films A1, B1 and C1 is obtained.

[0089] Step 3: At -25-45 ℃, 10 parts of 1,6-hexanediol diacrylate, 15 parts of dipentaerythritol-hexaacrylate, 10 parts of ethylene glycol acetoacetate methacrylate, 50 parts of dichloromethane solvent, and 2 parts of initiator are mixed and stirred until homogeneous to obtain a mixture solution. The mixture containing the photopolymerizable monomers is coated onto a PET film containing an ITO layer. A PET film containing JT-1000 and a TFT film substrate containing the polymer film-supported chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane are rolled to prepare a packaging box. Then, the solvent is removed by drying at 60 ℃. After drying, the package is polymerized for 120 s under a light intensity of 0.3-300 mW / cm2 to obtain the packaged packaging box.

[0090] Step 4: At -25-45℃, mix 2 parts by weight of chiral compound 9-(4-propylcyclohexyl)-9,10-dihydro-8H-dinaphthalene[2,1-F:1',2'-H][1,5]dioxane, 1 part by weight of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 2 parts by weight of 1,6-hexanediol diacrylate, 1 part by weight of 1,4-butanediol diacrylate, 2 parts by weight of pentaerythritol tetrakis(3-mercaptopropionic acid), 2 parts by weight of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, and 85 parts by weight of phase-phase liquid crystal to obtain a parent liquid crystal mixture with a reflective red color. Turn on the vacuum pump and drop the parent liquid crystal mixture onto one side of the encapsulation box. In the presence of the vacuum pump, the parent liquid crystal mixture is drawn into the encapsulation box due to atmospheric pressure. Then, the parent liquid crystal mixture fills the entire encapsulation box, and after being fully diffused at a temperature of 25-40 ℃ for 10 minutes, it is irradiated with ultraviolet light for 5-30 minutes to obtain a single-layer liquid crystal reflective color display module.

[0091] The performance of the single-layer liquid crystal reflective color display modules prepared in Examples 1-9 was tested. The test method was as follows: the transmission and reflection spectra of Examples 1-9 were obtained using a Perkin Elmer-LAMBDA Model 950 UV-VIS-IR ultraviolet spectrophotometer; the driving voltage was measured using a frequency-switched oscilloscope and a polarizing microscope; the contrast ratio was obtained by calculating the ratio of planar states to isotropic states based on the data measured using the Perkin Elmer-LAMBDA Model 950 UV-VIS-IR ultraviolet spectrophotometer; and the texture of the red, green, and blue liquid crystals was observed using an Axio Lab. A1 Pol polarizing microscope.

[0092] The testing process involved measuring the reflectance spectrum of cholesteric liquid crystals using a Perkin Elmer LAMBDA 950 UV-VIS-IR spectrophotometer. First, the instrument needed to be warmed up and calibrated: after powering on, a 15-minute warm-up was performed to ensure the stability of the deuterium / tungsten lamp source. Baseline calibration was then performed using a standard reflector within the target wavelength range (e.g., 300-800 nm) to eliminate environmental interference. The sample thickness was controlled to the height of the photolithographic wall to maintain optical uniformity. For parameter settings, after selecting the reflection mode, the slit width was adjusted by 1 nm to balance the signal-to-noise ratio and scan speed (approximately 240 nm / min in a medium-speed mode). Simultaneously, the Bragg reflection peak position was estimated based on the liquid crystal pitch (λ = n·P, where n is the average refractive index and P is the pitch). During measurement, the sample was fixed to the reflector attachment, and the background signal was subtracted before starting the scan. In the data analysis phase, UV WinLab software was used to extract the reflection peak position, full width at half maximum (FWHM), and intensity. Temperature control data was also correlated to analyze the peak position shift caused by the pitch temperature dependence.

[0093] When measuring the transmission spectrum of cholesteric liquid crystals, the instrument must first be warmed up for 15 minutes to ensure the stability of the deuterium and tungsten lamp sources. A background scan is then performed within the target wavelength range to eliminate substrate absorption and environmental noise. Parameter settings include transmission mode, adjusting the slit width to 1 nm to balance resolution and signal-to-noise ratio, scanning speed (approximately 240 nm / min in medium speed mode), and data acquisition interval (1 nm) based on the liquid crystal optical characteristics. Simultaneously, the characteristic transmission valley position corresponding to the liquid crystal pitch is estimated using the Bragg reflection theory formula (λ = n·P), and a targeted scanning range (300-800 nm in visible light) is set. The sample orientation is fixed during measurement to maintain the consistency of liquid crystal molecule orientation. In the data processing stage, UV WinLab software is used to extract the valley wavelength, full width at half maximum (FWHM), and transmittance gradient of the transmittance curve. This instrument's wide spectral coverage (250-2500 nm) and high optical resolution (0.05 nm) accurately capture the transmission modulation characteristics and dynamic response behavior of cholesteric liquid crystals. The test results are shown in the table below.

[0094]

[0095] The test results above show that after the formulation improvement and process upgrade of Examples 1-7, the driving voltage, contrast and reflectivity all show an enhanced performance trend.

[0096] Figure 3 These are polarized microscope images of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared according to Embodiments 1-7 of this utility model. Figure 3As can be seen from the above embodiments, the single-layer encapsulated full-color reflective cholesteric liquid crystal color display modules all exhibit good planar texture. Good planar texture is a prerequisite for high reflectivity, and the single-layer encapsulated full-color reflective cholesteric liquid crystal color display modules prepared by this method have excellent reflective performance.

[0097] Figure 4 The transmittance of the red, green, and blue pixels of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display material prepared in Examples 1-7 of the present invention is shown. Figure 4 As can be seen from the data, the transmittance of Examples 1-7 gradually decreases, while the half-width at half-maximum (WHM) increases, resulting in a wider reflection band and more vivid and bright color reflection. Furthermore, the depth of the transmission valley is positively correlated with the intensity of the reflection peak, thus improving reflection efficiency. Secondly, the lower background transmittance enhances display contrast while reducing backlight-dependent power consumption. Therefore, the decreasing transmittance trend essentially reflects a systematic optimization of reflective optical performance.

[0098] Figure 5 The images show the reflection spectra of the red, green, and blue pixels of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared in embodiments 1-7 of the present invention. Figure 5 As can be seen from the data, the gradual increase in reflectivity combined with a slight broadening of the half-width at half-maximum (WHM) in Examples 1-7 reflects the directional optimization of the optical performance of cholesteric liquid crystal RGB pixels. The direct cause of the enhanced reflectivity is the improved precision of pitch (P) control. A pitch distribution closer to the Bragg condition allows for more selective reflection of incident light, while the uniformity of the planar texture reduces light scattering loss, concentrating photon energy more efficiently in the reflection band. Through process upgrades and technological optimizations, the reflectivity of Examples 1-7 becomes increasingly higher, with a slight broadening of the WHM. This combination of "high reflectivity + moderately broadened WHM" has dual value in practical applications: the increased reflectivity directly enhances display brightness and light utilization, while the slightly wider reflection band improves the viewing angle characteristics of the display device and reduces sensitivity to viewing angle. The overall data from Examples 1-7 indicate that through molecular arrangement control and structural design optimization, a synergistic improvement in reflection efficiency and optical performance has been achieved.

[0099] Figure 6 This refers to the driving voltage of the single-layer encapsulated full-color reflective cholesteric liquid crystal color display module prepared in embodiments 1-7 of this utility model. From... Figure 6 As can be seen, the driving voltage of implementations 1-7 shows a decreasing trend, demonstrating a more energy-saving display effect.

[0100] Figure 7 This refers to the contrast ratio of the single-layer encapsulated full-color reflective cholesteric phase liquid crystal color display material prepared in Examples 1-7 of this utility model. From... Figure 7As can be seen from the images, the contrast of embodiments 1-7 gradually increases, which is due to the increase in the ratio of transmittance of the reflectance spectra of embodiments 1-7 in the planar state and the isotropic state. From the reflectance spectra of embodiments 1-7, it can be seen that the reflectance is increasing, and the colors are becoming more vibrant.

[0101] The preparation methods and processes of embodiments 8 and 9 differ from those of embodiments 1-7. Embodiments 1-7 use inkjet printing to realize the RGB pixel array. Embodiment 8, on the other hand, uses the concentration difference of chiral molecules within the RGB pixels achieved by etching the substrate thin film to realize the preparation of a single-layer encapsulated full-color reflective cholesteric liquid crystal color display module. There are fundamental differences in preparation processes and technologies compared to embodiments 1-7. It is worth noting that all three aim to prepare a single-layer encapsulated full-color reflective cholesteric liquid crystal color display module, but are achieved through different methods. The methods and materials designed in this utility model should be within the scope of protection.

[0102] Example 9 utilizes photolithography, in addition to inkjet printing and etching, to achieve a single-layer encapsulated full-color reflective cholesteric liquid crystal color display material with varying chiral molecules within the RGB pixels. By photolithographically polymerizing and anchoring the polymerizable chiral molecules within the RGB pixels to different degrees, the areas through which ultraviolet light passes most diffuse to produce blue pixels after chiral molecule diffusion; the areas through which ultraviolet light passes less diffuse to produce green pixels; and the areas through which ultraviolet light passes least have most of the thin film and chiral molecules removed after development, resulting in red pixels. Finally, a single-layer encapsulated full-color reflective cholesteric liquid crystal color display module is obtained.

[0103] It is worth mentioning that the technical features involved in this utility model patent application, such as the mask, etching machine (Delphilaser type), and inkjet printer (DP-400), should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the utility model point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0104] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. A single-layer reflective liquid crystal color display module, characterized in that, From bottom to top, it includes a light-absorbing layer, a lower substrate with TFT electrodes on its upper surface, a red, green and blue three-primary-color reflective cholesteric liquid crystal layer, and an upper substrate with a conductive indium tin oxide layer on its lower surface.

2. The single-layer liquid crystal reflective liquid crystal color display module as described in claim 1, characterized in that, The light-absorbing layer is made of any one of black ink, black film, or black film with double-sided adhesive.

3. The single-layer liquid crystal reflective liquid crystal color display module as described in claim 1, characterized in that, The lower substrate is glass with TFT electrodes.

4. The single-layer liquid crystal reflective liquid crystal color display module as described in claim 1, characterized in that, The red, green, and blue tri-color reflective cholesteric liquid crystal layer includes several uniformly distributed polyimide isolation walls. A micrometer-level container is formed between two adjacent polyimide isolation walls. Every three adjacent micrometer-level containers form a pixel strip. In each pixel strip, one micrometer-level container contains a chiral compound and reflective red cholesteric liquid crystal, another micrometer-level container contains a chiral compound and reflective green cholesteric liquid crystal, and the last micrometer-level container contains a chiral compound and reflective blue cholesteric liquid crystal.

5. The single-layer liquid crystal reflective liquid crystal color display module as described in claim 4, characterized in that, The polyimide isolation wall has a height of 0.3-20 micrometers, a width of 0.3-20 micrometers, and a spacing of 2-120 micrometers between adjacent polyimide isolation walls. The polyimide isolation walls are bonded to the upper substrate and the lower substrate.

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