Surface treatment method for improving performance of MiniLED display module based on nano-composite coating
By using a surface treatment method with a nanocomposite coating, the problem of coating peeling and detachment in MiniLED display modules under extreme environments has been solved, achieving coating uniformity and stability, improving the module's heat dissipation and UV resistance performance, and ensuring long-term stability and display effect under high brightness environments.
Patent Information
- Application Number
- CN202511808682.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-03-06
AI Technical Summary
The coating of existing MiniLED display modules is prone to peeling and detachment under environmental conditions such as high temperature, humidity changes or mechanical impact, resulting in poor long-term stability. In addition, traditional coating technology lacks precise control over nanoparticles, which affects the display effect and the long-term stability of the module.
A surface treatment method based on nanocomposite coatings is adopted, including plasma cleaning, interface modification, electrostatic spraying and medium-temperature thermal curing, using functional nanoparticles such as nickel-doped ZnO nanosheets, hollow graphene quantum dots and fluorinated titanate nanowires to form a uniform and stable coating structure.
The coating improves mechanical strength, adhesion, and long-term stability, enhances the heat dissipation performance and UV resistance of the MiniLED display module, and ensures long-term stable operation in high-brightness and high-stability environments.
Smart Images
Figure CN121607306A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of surface treatment technology, specifically to a surface treatment method for improving the performance of MiniLED display modules based on nanocomposite coatings. Background Technology
[0002] With the rapid development of MiniLED display technology, MiniLED display modules have been widely used in high-end display devices, such as traffic indicator screens, outdoor advertising screens, and smart city displays, due to their advantages such as high brightness, high contrast, and wide color gamut. However, MiniLED display modules face many challenges in practical use, especially in terms of long-term stable operation in high-brightness environments, heat dissipation performance, and coating adhesion. Traditional MiniLED display modules often rely on simple coating methods. These methods have limitations in improving coating performance, cannot effectively solve the heat dissipation problem in high-brightness and high-temperature environments, and have weak adhesion between the coating and the substrate, leading to easy coating peeling or detachment, thus affecting the display effect and the long-term stability of the module.
[0003] In existing technologies, coating curing and adhesion enhancement are typically achieved through physical or chemical methods, such as heat treatment or the use of certain adhesives. However, these methods often fail to improve the mechanical strength and long-term stability of the coating while ensuring its functionality. More importantly, traditional coating technologies often lack precise control over nanoparticles, resulting in poor coating uniformity and poor performance under harsh environments such as high temperatures, strong light exposure, and humidity variations, thus limiting their application in outdoor displays and high-brightness environments. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a surface treatment method for improving the performance of MiniLED display modules based on nanocomposite coatings. This method solves the problem that coatings in existing technologies are prone to peeling or detachment under environmental conditions such as high temperature, humidity changes, or mechanical impact, resulting in poor long-term stability of MiniLED display modules.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a surface treatment method for improving the performance of MiniLED display modules based on a nanocomposite coating, comprising the following steps: First, the surface of the MiniLED display module is plasma cleaned to remove impurities and introduce active groups; Then, the functional nanoparticles undergo interface modification treatment; After the interface modification treatment, a nanocomposite coating liquid containing modified nanoparticles is prepared. After preparation, the nanocomposite coating liquid is applied to the surface of the MiniLED display module by electrostatic spraying. After the coating is completed, the coated module is subjected to thermal phase separation induction treatment at a temperature of 60–80℃. After the initial treatment, the coating is cured at a medium temperature of 80–100℃ to fix its microstructure. Finally, it is cooled and the surface treatment is completed.
[0006] Preferably, the plasma cleaning uses a mixture of oxygen and argon gas with a volume ratio of 1:1, the plasma cleaning power is 100–150W, and the processing time is 3–7 minutes.
[0007] Preferably, the functional nanoparticles include nickel-doped ZnO nanosheets and hollow graphene quantum dots, and the interface modification is performed through hydroxylation and amination treatments.
[0008] Preferably, the content of nickel-doped ZnO nanosheets in the nanocomposite coating liquid is 20–30 wt%, the content of hollow graphene quantum dots is 15–25 wt%, the content of organically modified fluorinated titanate nanowires is 10–20 wt%, and the content of low molecular weight alkanolamine additive is 8–12 wt%.
[0009] Preferably, the voltage of the electrostatic spraying is 15–20kV, the distance between the nozzle and the surface of the MiniLED module is 10–20cm, and the thickness of the resulting coating is 5–8μm.
[0010] Preferably, during the thermally induced phase separation process, nickel-doped ZnO nanosheets are enriched on the coating surface, hollow graphene quantum dots are aligned along the heat flow direction, and fluorinated titanate nanowires form the outermost hydrophobic protective layer.
[0011] Preferably, in the medium-temperature heat curing process, the curing temperature is 80–100℃, the curing time is 8–15 minutes, and the heating rate is 2–5℃ / min.
[0012] Preferably, the total solids content in the nanocomposite coating liquid is 20–40 wt%, and the solvent used is a mixture of cyclohexanone and butyl acetate in a volume ratio of 1:1.
[0013] Preferably, the surface-treated MiniLED display module is used in traffic sign screens, outdoor advertising screens, or smart city display screens. The surface treatment of the MiniLED display module is used for heat dissipation and stability of the display module in high-brightness environments.
[0014] Preferably, the plasma cleaning step introduces hydroxyl and carbonyl functional groups into the surface of the MiniLED display module during the process to enhance the adhesion between the coating and the substrate, and to provide ultraviolet shielding, thereby reducing the long-term impact of ultraviolet rays on the display module.
[0015] This invention provides a surface treatment method for improving the performance of MiniLED display modules based on a nanocomposite coating. It has the following beneficial effects: 1. This invention achieves uniform cross-linking of nanoparticles in the coating through medium-temperature thermosetting treatment, resulting in a coating with excellent mechanical strength, adhesion and long-term stability, thereby improving the durability and operational stability of the MiniLED display module.
[0016] 2. This invention introduces hydroxyl and carbonyl functional groups through a plasma cleaning step, achieving a strong bond between the coating and the substrate, resulting in a coating with higher adhesion and better UV shielding capability, significantly extending the service life of MiniLED display modules in high UV environments.
[0017] 3. By precisely controlling the total solid content and solvent ratio of the coating liquid, this invention achieves excellent rheological properties and stability of the coating liquid, resulting in a uniform and stable nanocomposite coating, which further improves the heat dissipation performance and display stability of the MiniLED display module under high brightness.
[0018] 4. The present invention enhances the heat dissipation and UV resistance of the MiniLED display module through surface treatment, enabling it to operate stably for a long time in environments with high brightness and high stability requirements, such as traffic signs, outdoor advertising screens, and smart city displays, and achieving high-efficiency display effects even under extreme environmental conditions. Attached Figure Description
[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation
[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Please see the appendix Figure 1 This invention provides a surface treatment method for improving the performance of MiniLED display modules based on a nanocomposite coating, comprising the following steps: First, the surface of the MiniLED display module is plasma cleaned to remove impurities and introduce active groups; Then, the functional nanoparticles undergo interface modification treatment; After the interface modification treatment, a nanocomposite coating liquid containing modified nanoparticles is prepared. After preparation, the nanocomposite coating liquid is applied to the surface of the MiniLED display module by electrostatic spraying. After the coating is completed, the coated module is subjected to thermal phase separation induction treatment at a temperature of 60–80℃. After the initial treatment, the coating is cured at a medium temperature of 80–100℃ to fix its microstructure. Finally, it is cooled and the surface treatment is completed.
[0022] Plasma cleaning uses a mixture of oxygen and argon gas with a volume ratio of 1:1. The plasma cleaning power is 100–150W, and the processing time is 3–7 minutes.
[0023] Specifically, the surface of the MiniLED display module is first subjected to plasma cleaning to provide an ideal interface foundation for subsequent nanocomposite coating deposition. By controlling specific atmosphere and energy conditions, surface impurities can be effectively removed, and active functional groups can be introduced into the module surface, thereby controlling and enhancing the interface energy. This lays the foundation for the firm adhesion of the nanocomposite coating and subsequent structural construction. This invention uses a mixture of oxygen and argon as the working atmosphere for plasma cleaning, with a volume ratio of 1:1. The oxygen component is mainly responsible for surface activation, initiating oxidation reactions on the MiniLED display module surface and introducing polar functional groups such as hydroxyl and carbonyl groups, thus significantly increasing the polarity and surface free energy of the substrate surface. These active groups not only enhance the chemical bonding force between the subsequent nanocoating and the substrate but also provide more reaction sites, contributing to the formation of a stable and dense interface structure. The introduction of argon mainly plays a physical bombardment role, promoting the stripping of the surface impurity layer through high-energy ion bombardment, further improving surface cleanliness, and fine-tuning the surface roughness through moderate physical etching. Appropriate roughness facilitates mechanical interlocking of subsequent coatings, thereby synergizing with chemical bonding and further enhancing the adhesion strength between the coating and the substrate. The 1:1 volume ratio of the oxygen-argon mixture has been optimized to balance the activation effect with the control of bombardment intensity, preventing excessive etching that could damage the substrate. Plasma can fully excite gas molecules to form a high-density plasma environment, ensuring sufficient energy is transported to the module surface to drive the generation of active groups, while avoiding excessive energy that could cause thermal damage to the substrate or over-etching of the surface. This power setting, through precise control of energy input, achieves a balance between surface functionalization and surface morphology optimization, ensuring the consistency and controllability of surface modification effects. It ensures that oxygen and argon form a stable and dense active group layer on the surface, while effectively removing trace impurities and maximizing the integrity of the substrate, avoiding surface performance degradation due to prolonged cleaning. In addition, the appropriate processing time can reduce energy consumption in the manufacturing process and improve overall process efficiency, meeting the requirements of industrial production for efficient and low-energy processes. Compared with traditional cleaning methods that simply use oxygen or single-parameter control, this invention significantly improves the adhesion, uniformity, and interface stability of the subsequent nanocomposite coating by adjusting the volume ratio of oxygen and argon and coordinating power and time control.
[0024] Functional nanoparticles include nickel-doped ZnO nanosheets and hollow graphene quantum dots, with interface modification achieved through hydroxylation and amination treatments.
[0025] Specifically, to further optimize the performance of the nanocomposite coating and its interfacial compatibility with the MiniLED display module surface, specific types of functional nanoparticles were employed and subjected to interfacial modification treatment. By rationally selecting the nanoparticle system and employing precise surface modification methods, not only were the physicochemical properties of the nanoparticles improved, but their dispersion stability and functional synergy in the coating liquid system were also enhanced, thus laying the foundation for the final formation of a high-performance, multifunctional coating. This invention selected nickel-doped ZnO nanosheets and hollow graphene quantum dots as functional nanoparticles. Nickel-doped ZnO nanosheets, as a high-performance oxide semiconductor material, allow the doped nickel element to effectively regulate the band structure and carrier concentration of ZnO, thereby improving its surface activity and thermal conductivity. In this invention, the introduction of nickel-doped ZnO nanosheets is mainly used to enhance the heat dissipation performance of the coating and improve the interfacial optical performance by regulating the surface charge distribution of the coating. Simultaneously, the microscopic defects and energy level modulation brought about by nickel doping help the particles form a tighter physical and chemical bond at the interface, providing strong support for the subsequent compactness and functionality of the coating. Hollow graphene quantum dots are introduced into the coating system as another key component. Compared to traditional solid graphene quantum dots, hollow structures not only have a larger specific surface area but also superior optical absorption and electron transport properties. In this invention, hollow graphene quantum dots are mainly used to enhance the light absorption efficiency and ultraviolet shielding performance of the coating, and through their excellent electron mobility, they synergistically improve the overall photoelectric response characteristics of the coating. Interfacial modification treatments of hydroxylation and amination were performed on the functional nanoparticles. Hydroxylation introduces abundant hydroxyl functional groups onto the particle surface. These polar groups effectively improve the stable dispersion of particles in polar solvent systems and, during film formation, undergo hydrogen bonding or condensation reactions with active groups (such as hydroxyl and carbonyl groups) on the substrate surface, enhancing interfacial adhesion. Amination further introduces amino functional groups onto the particle surface. These functional groups not only provide additional polar forces, enhancing the chemical bonding between particles and between particles and the substrate, but also participate in cross-linking reactions during subsequent coating curing, forming a more stable three-dimensional network structure.
[0026] The nanocomposite coating solution contains 20–30 wt% nickel-doped ZnO nanosheets, 15–25 wt% hollow graphene quantum dots, 10–20 wt% organically modified fluorinated titanate nanowires, and 8–12 wt% low-molecular-weight alkanolamine additives.
[0027] Specifically, the content of nickel-doped ZnO nanosheets is set at 20–30 wt%. This component is mainly used to enhance the heat dissipation performance and interfacial stability of the coating. As a semiconductor material, nickel-doped ZnO nanosheets maintain excellent thermal conductivity under high-temperature conditions, enabling the coating to effectively conduct heat and prevent performance degradation caused by heat accumulation. Within the mass range of 20–30 wt%, the thermal conductivity, mechanical strength, and stability of nickel-doped ZnO nanosheets can provide the required heat dissipation effect while ensuring the density and uniformity of the coating. The content of hollow graphene quantum dots is 15–25 wt%. Hollow graphene quantum dots not only have a large specific surface area but also possess excellent optical and electronic conductivity. In this invention, they are primarily responsible for enhancing the light absorption capacity of the coating, particularly in terms of ultraviolet shielding. The hollow structure of the graphene quantum dots allows them to better absorb external radiation, reducing the long-term impact of ultraviolet radiation on the MiniLED display module. The content of organically modified fluorinated titanate nanowires was set at 10–20 wt%. Fluorinated titanate nanowires, through their unique structure, provide excellent UV resistance, significantly improving the environmental tolerance of the coating, especially effectively delaying material aging under prolonged exposure to UV radiation or high temperatures. The addition of fluorinated titanate nanowires not only enhances the coating's UV resistance but also provides excellent hydrophobicity through the introduction of fluorine, thereby strengthening the coating's water and stain resistance. The content of low-molecular-weight alkanolamine additives was controlled at 8–12 wt%. As surfactants, alkanolamine additives primarily improve the rheological properties of the coating solution and promote the uniform dispersion of nanoparticles in the coating. Low-molecular-weight alkanolamine additives, through hydrogen bonding with the nanoparticle surface, effectively reduce particle aggregation and promote uniform coating. Furthermore, alkanolamine additives can help form a denser network structure during coating curing, improving the coating's mechanical strength and impact resistance. The 8–12 wt% ratio ensures that the additives can fully exert their stability and dispersing functions without affecting other coating properties.
[0028] The electrostatic spraying voltage is 15–20kV, the distance between the nozzle and the surface of the MiniLED module is 10–20cm, and the resulting coating thickness is 5–8μm.
[0029] Specifically, the voltage for electrostatic spraying is set within the range of 15–20kV. Voltage is one of the most critical parameters in the electrostatic spraying process, directly affecting the atomization effect of the sprayed liquid and the adhesion between the particles and the substrate. Excessive voltage may lead to particle aggregation or uneven spraying, while insufficient voltage will affect the adhesion and density of the coating. By controlling the voltage between 15–20kV, this invention ensures that the sprayed liquid can form fine, uniform mist particles that can stably adhere to the surface of the MiniLED display module, while avoiding particle agglomeration or electric shock caused by excessive voltage, thus guaranteeing the uniformity and high quality of the coating. The distance between the nozzle and the surface of the MiniLED module should be controlled within the range of 10–20 cm. The distance between the nozzle and the substrate surface has a direct impact on the coating thickness, uniformity, and adhesion. Too close a distance may result in excessive coating buildup and an uneven coating, while too far a distance may cause the sprayed particles to lose sufficient energy, leading to poor adhesion or an uneven coating. By precisely controlling the coating thickness, which directly affects the coating's functionality and mechanical properties, the invention achieves a uniform, dense, and robust coating application on the surface of MiniLED display modules. A coating that is too thin may fail to provide sufficient protection or functionality, while an excessively thick coating can lead to reduced adhesion or cracking during use. By controlling the coating thickness within the range of 5–8 μm, sufficient durability and protective effect are ensured, while avoiding the unevenness and reduced adhesion problems that can result from thicker coatings. Through the optimization of the aforementioned electrostatic spraying parameters, this invention enables the uniform, dense, and robust application of nanocomposite coatings on the surface of MiniLED display modules. Precise control of these parameters not only improves the physical and mechanical properties of the coating but also optimizes its electrical and thermal properties. Compared to traditional spraying techniques, this invention, by optimizing the combination of spraying voltage, nozzle distance, and coating thickness, enables more precise control over coating quality, thereby enhancing the controllability and application effect of the entire surface treatment process.
[0030] During the thermally induced phase separation process, nickel-doped ZnO nanosheets are enriched on the coating surface, hollow graphene quantum dots are aligned along the heat flow direction, and fluorinated titanate nanowires form the outermost hydrophobic protective layer.
[0031] Specifically, during the thermally induced phase separation process, nickel-doped ZnO nanosheets primarily accumulate on the coating surface. As a material with excellent thermal conductivity, nickel-doped ZnO nanosheets can migrate to the surface layer of the coating during heat treatment via a thermally driven effect. Through this process, the enrichment of nickel-doped ZnO nanosheets not only enhances the surface heat dissipation capacity of the coating but also further strengthens its thermal stability and resistance to thermal stress. This surface enrichment of nanosheets effectively optimizes the heat dissipation performance of the coating, ensuring the stability of the MiniLED display module under high brightness and high temperature operating environments. The enrichment process of nickel-doped ZnO also improves the surface morphology and microstructure of the coating, increases its surface roughness, and further enhances its adhesion to the substrate. Hollow graphene quantum dots align along the heat flow direction during thermally induced phase separation. Due to their excellent electronic conductivity and optical absorption properties, hollow graphene quantum dots spontaneously form an ordered arrangement along the heat flow direction during heat treatment. This directional arrangement not only enhances the coating's light absorption capability, especially in terms of ultraviolet shielding, but also improves the coating's conductivity and electronic stability through electron migration effects. The hollow structure provides an additional reflective layer, effectively reducing stress concentration on the coating surface caused by light or heat, maintaining the coating's flexibility and uniformity. This arrangement structure improves the coating's multifunctionality while also enhancing its mechanical strength and durability. During thermally induced phase separation, fluorinated titanate nanowires form the outermost hydrophobic protective layer of the coating. As a typical hydrophobic material, the migration and directional alignment of fluorinated titanate nanowires during thermally induced phase separation effectively form the outer protective layer of the coating. This layer not only possesses strong hydrophobicity but also effectively prevents the penetration of pollutants and moisture, preventing performance degradation of the coating due to moisture or external contamination. It enables the formation of an ordered structure and distribution of nickel-doped ZnO nanosheets, hollow graphene quantum dots, and fluorinated titanate nanowires on the coating surface. This process significantly improves the coating's heat dissipation, optical, electronic, and environmental adaptability properties. Furthermore, through the synergistic effect between materials, the final coating possesses multifunctional, high-performance, and highly stable characteristics. Compared with traditional coating methods, this invention, through precise control of the thermally induced phase separation process, enables the directional alignment and ordered distribution of particles at the microstructure level, thereby effectively enhancing the overall performance of the coating.
[0032] In the medium-temperature heat curing process, the curing temperature is 80–100℃, the curing time is 8–15 minutes, and the heating rate is 2–5℃ / min.
[0033] Specifically, the curing time directly affects the degree of cross-linking and the curing effect of the coating. Too short a time may lead to incomplete cross-linking, resulting in poor mechanical properties and chemical stability of the coating; while too long a curing time may increase production cycles, cause unnecessary energy consumption, and even lead to excessive cross-linking of the coating, resulting in increased brittleness. Uniform heating is crucial during the curing process. Too rapid a heating rate may cause excessive differences in thermal stress between the coating surface and interior, leading to cracks or peeling; while too slow a heating rate may result in inefficient curing and failure to achieve timely structural optimization of the coating. By setting the heating rate within the range of 2–5℃ / min, this invention ensures uniform and controllable temperature changes during curing, effectively avoiding thermal stress concentration in the coating while ensuring efficient curing. Through precise control of the medium-temperature thermal curing process, this invention successfully achieves physical, chemical, and structural optimization of the nanocomposite coating. This process not only significantly enhances the coating's adhesion and mechanical strength but also improves its corrosion resistance, UV resistance, and oxidation resistance, ensuring the stability and reliability of the MiniLED display module during long-term use. Compared with traditional coating curing methods, this invention avoids the problem of unstable coating performance caused by incomplete curing or excessively high temperature in traditional methods by precisely controlling the curing temperature, time and heating rate.
[0034] The total solids content in the nanocomposite coating solution is 20–40 wt%, and the solvent used is a mixture of cyclohexanone and butyl acetate in a volume ratio of 1:1.
[0035] Specifically, the total solid content of the nanocomposite coating liquid is an important parameter affecting the rheology and coating effect of the coating liquid. Too low a solid content may lead to unstable adhesion or uneven coating, while too high a solid content may lead to excessive viscosity of the coating, affecting the coating performance and even causing spraying difficulties. In the solid content range of 20-40 wt%, the coating liquid has good fluidity and sprayability, while ensuring that sufficient functional nanoparticles and active components are uniformly dispersed in the solvent, effectively avoiding particle precipitation and separation, and ensuring the uniformity and stability of the coating. A 1:1 volume ratio of cyclohexanone and butyl acetate is used as the solvent. Cyclohexanone and butyl acetate, as solvents, each possess different solubility and volatility characteristics. Their mixture achieves ideal rheological properties and an appropriate evaporation rate for the coating solution. Cyclohexanone, with its strong polarity, effectively dissolves highly polar components in the coating solution, enhancing the film-forming properties of the coating. Butyl acetate, as a low-polarity solvent, effectively improves the stability of the solution, reduces the viscosity of the coating solution, and makes it more uniform and easier to control during coating. This solvent ratio maintains the stability and uniformity of the coating in different coating processes, avoiding the impact of excessively fast or slow solvent evaporation on the film quality. The optimized 1:1 volume ratio of cyclohexanone to butyl acetate effectively balances the solubility and rheological properties of the coating solution, ensuring good dispersibility and wettability of the coating. An appropriate solvent combination not only ensures the ideal viscosity of the coating solution but also helps the coating achieve a uniform molecular cross-linking reaction during curing, improving the coating's adhesion, hardness, and durability. This ratio ensures good coating performance while avoiding problems such as poor dispersibility and uneven coating that may occur when using a single solvent.
[0036] Surface-treated MiniLED display modules are used in traffic signs, outdoor advertising screens, or smart city displays. The surface treatment of MiniLED display modules is used for heat dissipation and stability in high-brightness environments.
[0037] Specifically, the application of surface treatment technology not only improves the heat dissipation capacity of the display module but also enhances its resistance to degradation under high-brightness environments. The improved heat dissipation performance is primarily due to the introduction of nickel-doped ZnO nanosheets. The excellent thermal conductivity of these nanosheets allows for rapid heat dissipation from the MiniLED display module, preventing performance degradation caused by heat accumulation. Especially in environments with prolonged high-brightness operation, heat dissipation performance is crucial, effectively extending the lifespan of the display module and maintaining consistent brightness output. Furthermore, the introduction of hollow graphene quantum dots enhances the module's optical performance, resulting in clearer and more stable display effects under high brightness, avoiding image distortion or fading problems caused by excessively high brightness in traditional display modules. The structure of the stability control coating in high-brightness environments gives it strong UV resistance and environmental adaptability. In external environment applications such as traffic signs and outdoor advertising screens, display modules need to be exposed to ultraviolet radiation and strong light for a long time. Traditional modules often suffer from decreased display performance and even accelerated material aging due to excessive light. However, this invention uses fluorinated titanate nanowires with UV shielding function to effectively reduce the damage of ultraviolet rays to the module materials, ensuring the stability of the module under long-term exposure to strong light. In addition, the introduction of a hydrophobic coating enhances the waterproof and stain-resistant properties of the module surface, ensuring that the display module can operate continuously under changing external environmental conditions, especially in environments with high humidity, rain, or pollutant deposition. Through these comprehensive surface treatment technologies, MiniLED display modules exhibit exceptional long-term stability, high brightness adaptability, and environmental resistance in applications such as traffic signs, outdoor advertising screens, and smart city displays. Compared to traditional display modules, the surface treatment of this invention not only improves their operating efficiency and lifespan in extreme environments but also ensures high-quality display effects, meeting the demands of modern high-performance display technologies. Especially in scenarios requiring 24-hour continuous operation, the surface-treated MiniLED display modules provide more stable display performance, reduce failures and maintenance costs, and offer strong technical support for various display applications.
[0038] The plasma cleaning process introduces hydroxyl and carbonyl functional groups into the surface of the MiniLED display module to enhance the adhesion between the coating and the substrate, and to provide UV shielding, thereby reducing the long-term effects of UV radiation on the display module.
[0039] Specifically, during plasma cleaning, the module surface is excited in a plasma atmosphere, and the mixture of oxygen and argon effectively triggers a surface oxidation reaction. The introduction of oxygen generates a large number of hydroxyl and carbonyl functional groups on the module surface. The formation of these polar functional groups not only increases the surface's chemical activity but also significantly improves its surface energy, providing more chemical bonding sites for the coating. This surface functionalization treatment enhances the adhesion between the coating and the substrate through physical adsorption and chemical bonding, preventing the coating from peeling or detaching due to external factors such as thermal expansion and mechanical friction during use. The introduction of hydroxyl and carbonyl functional groups makes the interface between the coating and the substrate more robust, improving the overall performance and durability of the coating. The surface treatment following plasma cleaning also provides crucial support for the UV-shielding function of the subsequent coating. The hydroxyl and carbonyl functional groups introduced onto the surface not only facilitate the bonding between the coating and the substrate but also play an effective role in light absorption within the coating structure. In particular, when combined with other functional nanoparticles (such as hollow graphene quantum dots and fluorinated titanate nanowires), the UV-shielding capability of the coating can be enhanced. This technological innovation significantly reduces the damage of ultraviolet rays to MiniLED display module materials, preventing material degradation, color fading, or other performance decline caused by long-term exposure to strong ultraviolet light. This functionalized surface treatment introduced by the plasma cleaning step not only enhances the adhesion between the coating and the substrate but also gives the MiniLED display module better UV resistance, thus significantly extending its lifespan in high UV environments. Compared with traditional technologies, this surface functionalization treatment significantly improves the coating's versatility, solves the common aging and fading problems of display modules in strong UV environments, and enhances the stability and reliability of the display module. The plasma cleaning step of this invention, by introducing specific functional groups and enhancing the coating's UV shielding capability, provides a solid guarantee for the long-term use of MiniLED display modules, and is particularly suitable for outdoor displays, traffic signs, and other environments with high UV radiation.
[0040] Example 1 Plasma cleaning: A mixture of oxygen and argon gas with a volume ratio of 1:1 is used. The cleaning power is set to 100W, and the processing time is 3 minutes. Nickel-doped ZnO nanosheets and hollow graphene quantum dots are selected for hydroxylation and amination interface modification treatment. The nanocomposite coating liquid ratio is: nickel-doped ZnO nanosheets: 20wt%, hollow graphene quantum dots: 15wt%, fluorinated titanate nanowires: 10wt%, low molecular weight alkanolamine additive: 8wt%. Electrostatic spraying: The voltage is set to 15kV, the distance between the nozzle and the MiniLED module is 10cm, and the coating thickness is 5μm. Thermal phase separation: The thermal phase separation treatment temperature is set to 60℃, the medium-temperature thermal curing temperature is set to 80℃, the curing time is 8 minutes, and the heating rate is 2℃ / min.
[0041] Example 2 Plasma cleaning: A mixture of oxygen and argon gas with a volume ratio of 1:1 is used. The cleaning power is set to 125W, and the processing time is 5 minutes. Nickel-doped ZnO nanosheets and hollow graphene quantum dots are selected for hydroxylation and amination interface modification treatment. The nanocomposite coating liquid ratio is: nickel-doped ZnO nanosheets: 25wt%, hollow graphene quantum dots: 20wt%, fluorinated titanate nanowires: 15wt%, low molecular weight alkanolamine additive: 10wt%. Electrostatic spraying: The voltage is set to 17.5kV, the distance between the nozzle and the MiniLED module is 15cm, and the coating thickness is 6μm. Thermal phase separation: The thermal phase separation treatment temperature is set to 70℃, the medium-temperature thermal curing temperature is set to 90℃, the curing time is 10 minutes, and the heating rate is 3℃ / min.
[0042] Example 3 Plasma cleaning: A mixture of oxygen and argon gas with a volume ratio of 1:1 is used. The cleaning power is set to 150W, and the processing time is 7 minutes. Nickel-doped ZnO nanosheets and hollow graphene quantum dots are selected for hydroxylation and amination interface modification treatment. The nanocomposite coating liquid ratio is: nickel-doped ZnO nanosheets: 30wt%, hollow graphene quantum dots: 25wt%, fluorinated titanate nanowires: 20wt%, low molecular weight alkanolamine additive: 12wt%. Electrostatic spraying: The voltage is set to 20kV, the distance between the nozzle and the MiniLED module is 20cm, and the coating thickness is 8μm. Thermal phase separation: The thermal phase separation treatment temperature is set to 80℃, the medium-temperature thermal curing temperature is set to 100℃, the curing time is 15 minutes, and the heating rate is 5℃ / min.
[0043] Comparative Example 1 The difference from Example 1 is that hollow graphene quantum dots in the nanocomposite coating liquid are removed, while the rest are the same.
[0044] Comparative Example 2 Compared with Example 1, the difference is that the plasma cleaning step is omitted, while the rest are the same.
[0045] Comparative Example 3 The difference from Example 2 is that unhydroxylated and unaminated nickel-doped ZnO nanosheets were used instead of the surface-modified particles; otherwise, they are the same.
[0046] Comparative Example 4 The difference from Example 2 is that the electrostatic spraying voltage is reduced to 10kV, while the rest are the same.
[0047] Comparative Example 5 The difference from Example 3 is that the fluorinated titanate nanowire component is removed, while the rest are the same.
[0048] Comparative Example 6 The difference from Example 3 is that the thermally induced phase separation treatment temperature is reduced to 50°C, while the rest are the same.
[0049] Table 1: Performance Test Data Table According to Table 1, if the content of hollow graphene quantum dots is not within the range of 15±1wt%, the heat dissipation performance and UV resistance will decrease significantly. If plasma cleaning is not performed, the adhesion of the nano-coating will be insufficient, resulting in a decrease in durability. If the functional groups on the surface of the functional nanoparticles are not within the range of modification treatment, the dispersion and uniformity of the coating will deteriorate significantly. If the spraying voltage is not within the range of 15 to 20 kV, the coating uniformity will deteriorate and the density of the coating will decrease. If the content of fluorinated titanate nanowires is not within the range of 20±2wt%, the microstructure formed by the thermally induced phase separation of the coating will be incomplete, resulting in a decrease in thermal conductivity. If the thermally induced phase separation temperature is not within the range of 60 to 80℃, the microporous structure of the coating cannot be effectively formed, and the functionality will be greatly reduced.
[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for improving the performance of a Mini LED display module surface treatment based on a nanocomposite coating, characterized by, The method comprises the following steps: First, the surface of the MiniLED display module is subjected to plasma cleaning to remove impurities and introduce active groups; Then, the functional nanoparticles are subjected to interface modification treatment; After the interface modification treatment, a nanocomposite coating liquid containing modified nanoparticles is prepared; After preparation, the nanocomposite coating liquid is applied to the surface of the MiniLED display module by electrostatic spraying; After spraying, the sprayed module is subjected to thermotropic phase separation induction treatment at a temperature of 60-80℃; After treatment, medium-temperature heat curing at 80-100℃ is performed to fix the coating microstructure, and finally the surface treatment is completed.
2. The method according to claim 1, wherein the method is characterized in that: The plasma cleaning uses a mixed gas of oxygen and argon, the volume ratio of the mixed gas of oxygen and argon is 1:1, the plasma cleaning power is 100-150W, and the treatment time is 3-7 minutes.
3. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. The functional nanoparticles include nickel-doped ZnO nanosheets and hollow graphene quantum dots, and the interface modification is performed by hydroxylation and amination treatment.
4. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. The content of nickel-doped ZnO nanosheets in the nanocomposite coating liquid is 20-30wt%, the content of hollow graphene quantum dots is 15-25wt%, the content of organically modified fluorinated titanate nanowires is 10-20wt%, and the content of low-molecular alcohol amine auxiliary agent is 8-12wt%.
5. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. The voltage of electrostatic spraying is 15-20kV, the distance between the nozzle and the surface of the MiniLED module is 10-20cm, and the thickness of the formed coating is 5-8μm.
6. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. During the thermotropic phase separation process, nickel-doped ZnO nanosheets are enriched on the surface of the coating, hollow graphene quantum dots are arranged along the direction of heat flow, and fluorinated titanate nanowires form the outermost hydrophobic protective layer.
7. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. In the medium-temperature heat curing treatment step, the curing temperature is 80-100℃, the curing time is 8-15 minutes, and the heating rate is 2-5℃ / min. 8.The method for improving the performance of a MiniLED display module surface treatment based on a nanocomposite coating according to claim 1, characterized in that: The total solid content in the nanocomposite coating liquid is 20-40wt%, and the solvent used is a mixed solvent of cyclohexanone and butyl acetate with a volume ratio of 1:
1. 9.The method for improving the performance of a MiniLED display module surface treatment based on a nanocomposite coating according to claim 1, characterized in that: The MiniLED display module after surface treatment is used in traffic indication screens, outdoor advertising screens or smart city display screens, and the surface treatment of the MiniLED display module is used for heat dissipation of the display module and stability in high brightness environment.
10. The method of claim 1, wherein the method is performed on a surface of a Mini LED display module. The plasma cleaning step introduces hydroxyl and carbonyl functional groups on the surface of the MiniLED display module during the treatment process to enhance the adhesion of the coating to the substrate, for ultraviolet shielding and reducing the long-term effect of ultraviolet on the display module.