Light-loss-free colored drawing beautifying process for display module

Abstract

The invention discloses a light-loss-free colored drawing beautifying technology for a display module in the field of display module surface treatment and beautifying. The technology comprises the steps of pretreatment, epoxy resin glue coating and UV curing, surface finishing, UV colored drawing printing and aftertreatment. The light-emitting side of the LED display module is coated with the UV curing type epoxy resin glue in a manner of avoiding lamp beads, a flat coating is formed after curing, then colored drawing patterns are printed on the surface of the coating, and the double effects of light-loss-free display and artistic beautification are achieved according to the principle that the patterns are weakened due to the fact that light is strong when an LED is turned on and are clear and visible when the LED is turned off. Three differentiated embodiments are arranged, the three beautifying effects that the plane pattern is flush with the lamp bead, the plane pattern is lower than the lamp bead and the 3D pattern is achieved respectively, the process controllability is high, the pattern diversity is high, the coating and pattern adhesive force is excellent, the problems that in an existing process, light is lost, the pattern is prone to falling off, and the attractiveness is poor are solved, and the product quality is improved. The method is suitable for large-scale beautifying production of various LED display modules.

Description

Technical Field

[0001] This invention relates to the field of surface treatment and beautification of display modules, specifically a non-light-loss color painting beautification process for display modules. Background Technology

[0002] LED display modules are widely used in various scenarios such as advertising media, stage performances, urban landscapes, and interior decoration. With the upgrading of market demands, users not only require display modules to have excellent display performance, but also place higher demands on their artistic and personalized appearance. Existing LED display module aesthetic processes mainly have the following shortcomings:

[0003] 1. Traditional beautification methods such as spraying and film application will cover the light-emitting surface of LED beads, resulting in light blockage, brightness reduction, and color distortion, making it impossible to achieve a truly light-loss-free display;

[0004] 2. If the painted layer is not avoided in the LED bead area, the connection between the painted layer and the LED bead surface will be uneven, making it easy for dust to accumulate and peel off, and affecting the overall aesthetics; if a simple avoidance is adopted, it will result in an abrupt connection between the LED bead and the painted area, destroying the integrity of the pattern.

[0005] 3. Existing processes cannot simultaneously meet the dual requirements of "clear and beautiful pattern when closed" and "no light loss when open," and the pattern forms are limited, failing to meet the personalized decoration needs of different scenarios.

[0006] 4. Traditional painting techniques use coatings with poor adhesion, insufficient scratch resistance and weather resistance, which can easily lead to fading and peeling of patterns after long-term use.

[0007] Based on this, and taking into account the light-emitting characteristics of LED display modules, developing a color painting and beautification process that can achieve light loss-free display, smooth transitions, diverse patterns, and high durability has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] The purpose of this invention is to provide a non-light-loss color painting and beautification process for display modules. Based on the principle that "the pattern is clearly visible when the LED display module is off, and the pattern is weakened by strong light when it is on", and combined with the UV curing characteristics of epoxy resin and precise avoidance technology, the artistic beautification of the display module can be achieved without affecting the light output performance of the LED beads, while improving the stability, durability and pattern diversity of the process.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A non-light-loss color enhancement process for display modules includes the following steps:

[0011] S1. Pretreatment: The light-emitting side surface of the LED display module is cleaned, dried and roughened to remove surface oil, dust, impurities and oxide layer, thereby improving the adhesion between the epoxy resin adhesive and the module surface.

[0012] S2. Epoxy Resin Adhesive Coating and UV Curing: Epoxy resin adhesive is applied to the light-emitting side surface of the LED display module by dispensing or scraping. During the coating process, all LED beads are precisely avoided. The epoxy resin adhesive is cured by UV curing equipment to form a smooth UV-cured epoxy resin layer.

[0013] S3. Surface finishing: Grinding and polishing the cured UV-cured epoxy resin layer to ensure that its surface is smooth and flat and forms a preset connection with the LED lamp bead surface;

[0014] S4. UV Color Printing: Using UV digital printing technology, a preset artistic color pattern is printed on the surface of the UV-cured epoxy resin layer (avoiding the LED lamp bead area). After printing, it is quickly cured by UV light, so that the pattern is tightly bonded to the UV-cured epoxy resin layer.

[0015] S5. Post-processing: Perform secondary UV curing and surface protection treatment on the painted display module to improve the scratch resistance, weather resistance and fading resistance of the pattern, and complete the entire painting and beautification process.

[0016] As a further aspect of the present invention: in step S1, the cleaning process uses anhydrous ethanol or a special cleaning agent for wiping, and the roughening process uses plasma treatment or sandblasting. After treatment, the surface roughness of the module is controlled at Ra0.1-0.3μm to ensure that the epoxy resin adhesive can be tightly bonded. The drying process uses constant temperature drying, with the temperature controlled at 60-80℃ and the time at 10-20min, to avoid residual moisture on the surface affecting the curing effect.

[0017] As a further aspect of the present invention: in step S2, the epoxy resin adhesive is a transparent or semi-transparent UV-curable epoxy resin adhesive, with a light transmittance ≥90% after curing and a thickness controlled between 0.05mm and 0.3mm; the irradiation wavelength of the UV curing equipment is 365-405nm, the curing time is 30-60s, and the curing temperature is 25-35℃, ensuring that the epoxy resin adhesive is completely cured without damaging the LED beads.

[0018] As a further aspect of the present invention: in step S4, the UV digital printing process uses a piezoelectric printhead with a printing resolution of not less than 1200dpi, which can achieve accurate printing of various patterns such as monochrome, multi-color gradient, and 3D stereoscopic; the UV printing ink is a high-adhesion, weather-resistant UV ink with an adhesion level ≥4B to the UV-cured epoxy resin layer.

[0019] As a further aspect of the present invention: in step S5, the irradiation time for the secondary UV curing is 20-40 seconds to ensure that the pattern is completely fused with the epoxy resin layer; the surface protection treatment is to spray a transparent UV varnish or attach a high-transparency transparent protective film, with the UV varnish thickness being 0.02-0.05 mm, to further improve the durability of the pattern.

[0020] The core principle of this invention is as follows: When the LED display module is off, no strong light is emitted, and the painted patterns on the surface of the UV-cured epoxy resin layer are clearly visible, serving an aesthetic and decorative purpose; when the LED display module is on, the light intensity emitted by the LED beads is much higher than the reflected light of the painted patterns, and the painted patterns are weakened by the strong light when viewed, without blocking the light emitted by the LED beads, achieving a display without light loss; at the same time, the UV curing treatment of the epoxy resin ensures that the coating is smooth and has strong adhesion, avoiding problems such as pattern peeling and dust accumulation.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Truly achieve zero light loss display: By precisely avoiding the LED beads, coating them with epoxy resin and painting them, and combining the principle of "strong light weakening pattern", the LED display module has no light obstruction, no brightness decay, and no color distortion when it is turned on, and the pattern is clear and beautiful when it is turned off, taking into account both display performance and artistic aesthetic needs.

[0023] 2. Smooth and aesthetically pleasing connection: Through precise coating, curing and finishing of epoxy resin adhesive, the UV-cured epoxy resin layer and LED beads are connected in a reasonable manner, avoiding abrupt joints, improving the overall neatness and aesthetics, and reducing dust accumulation.

[0024] 3. High pattern diversity: UV digital printing technology can print various patterns such as flat and 3D shapes, supports personalized customization, and adapts to the decoration needs of different scenarios;

[0025] 4. Excellent durability: The UV-cured epoxy resin layer has strong adhesion to the LED display module, and the UV-printed pattern is tightly bonded to the epoxy resin layer. With the help of post-processing, the pattern is scratch-resistant, weather-resistant, fade-resistant, and has a long service life.

[0026] 5. High process controllability: Parameters of each step (such as epoxy resin thickness, UV curing time, and printing resolution) can be precisely controlled, resulting in high process stability and repeatability, making it suitable for large-scale production. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Planar pattern + epoxy resin glue flush with LED bead surface

[0029] This embodiment provides a non-light-loss color enhancement process for display modules, the specific steps of which are as follows:

[0030] S1. Pre-treatment: Select a conventional outdoor LED display module (LED bead model SMD3535, array density 192×192 pixels / square meter), wipe its light-emitting side surface with anhydrous ethanol to remove oil and dust; use plasma treatment equipment to roughen the surface for 30 seconds to achieve a surface roughness of Ra0.2μm; place the treated module in a 60℃ constant temperature oven to dry for 15 minutes, and then remove and cool to room temperature.

[0031] S2. Epoxy Resin Coating and UV Curing: A transparent UV-curable epoxy resin adhesive (92% light transmittance after curing) is selected and applied to the light-emitting side of the LED display module using a scraping method. During the coating process, a shielding fixture is used to precisely avoid all LED beads, ensuring that the epoxy resin adhesive only covers the area outside the LED beads. The coated module is then placed in a UV curing device (irradiation wavelength 365nm) and cured at 25℃ for 45 seconds to form a 0.1mm thick UV-cured epoxy resin layer. After curing, the surface of the epoxy resin layer is flush with the surface of the LED beads.

[0032] S3. Surface finishing: Use fine sandpaper to lightly sand the surface of the UV-cured epoxy resin layer to remove burrs and imperfections, and then polish it with a polishing cloth to ensure that the surface is smooth and flat, with no steps or protrusions when it is connected to the surface of the LED beads.

[0033] S4. UV Color Printing: Using a UV digital printer (piezoelectric printhead, 1200dpi resolution), multi-color gradient flat patterns (floral patterns) are printed on the surface of the UV-cured epoxy resin layer (avoiding the LED bead area); after printing, the pattern is irradiated with UV light for 30 seconds to quickly cure the pattern and bond it tightly to the epoxy resin layer.

[0034] S5. Post-processing: Place the painted module into a UV curing device for secondary curing, with an irradiation time of 30 seconds; then spray a layer of transparent UV varnish (0.03mm thick) onto the pattern surface, and UV cure again for 20 seconds to complete the painting and beautification.

[0035] The effects of this embodiment are as follows: When the LED display module is off, the floral pattern is clear, the colors are vibrant, the overall surface is smooth and flat, and the aesthetics are high; when it is on, the light from the LED beads is transmitted normally, the pattern is weakened by strong light, there is no light obstruction, and the brightness is consistent with the unpainted module, achieving a light-loss-free display; after 1000 hours of weather resistance testing, the pattern did not fade or peel off, and the epoxy resin layer did not crack.

[0036] Example 2: Flat pattern + epoxy resin adhesive below the height of the LED beads

[0037] This embodiment provides a non-light-loss color enhancement process for display modules, the specific steps of which are as follows:

[0038] S1. Pre-treatment: Select an indoor LED display module (LED bead model SMD2121, array density 256×256 pixels / square meter), wipe the light-side surface with a special cleaning agent to remove impurities; roughen the surface by sandblasting, and control the surface roughness to Ra0.15μm; dry at 70℃ for 10 minutes, and cool to room temperature.

[0039] S2. Epoxy Resin Adhesive Coating and UV Curing: A semi-transparent UV-curable epoxy resin adhesive (90% light transmittance after curing) is selected. The adhesive is applied only in the gaps between the LED beads using a dispensing method. The coating height is controlled to be 0.05mm lower than the surface of the LED beads, and the coating thickness is 0.08mm. The adhesive is then placed in a UV curing device (irradiation wavelength 385nm) and cured at 30℃ for 30 seconds to form a UV-cured epoxy resin layer. This ensures that the epoxy resin layer only fills the gaps between the LED beads and does not cover them.

[0040] S3. Surface finishing: Lightly sand the surface of the epoxy resin layer with fine sandpaper to make it smooth and seamlessly connect with the bottom of the LED bead, without burrs or protrusions.

[0041] S4. UV Color Printing: Using a UV digital printer (1500dpi resolution), a monochrome simple planar pattern (geometric pattern) is printed on the surface of the epoxy resin layer, covering the epoxy resin layer area between all LED beads; after printing, the pattern is cured by UV light for 25 seconds.

[0042] S5. Post-processing: Perform secondary UV curing on the module, with an irradiation time of 25 seconds; attach a high-transmittance transparent protective film to the pattern surface, press it flat, and complete the color painting and beautification.

[0043] The effect of this embodiment: When the LED display module is off, the geometric pattern fills the gaps between the LED beads, the pattern is complete, simple and elegant, and the connection between the LED beads and the epoxy resin layer is natural and without any abruptness; when it is turned on, the light from the LED beads passes through normally, and the pattern in the gap is weakened by the strong light, which does not affect the display effect and there is no light loss; after 800 hours of scratch resistance test, the pattern has no scratches or peeling, and the epoxy resin layer has not peeled off.

[0044] Example 3: 3D pattern + epoxy resin adhesive flush with LED bead surface

[0045] This embodiment provides a non-light-loss color enhancement process for display modules, the specific steps of which are as follows:

[0046] S1. Pre-treatment: Select a stage LED display module (LED bead model SMD1921, array density 384×384 pixels / square meter), wipe the light side surface with anhydrous ethanol to remove oil stains; use plasma treatment for 40s to achieve a surface roughness of Ra0.3μm; dry at 80℃ for 20min, and cool to room temperature.

[0047] S2. Epoxy Resin Coating and UV Curing: Select transparent UV-curable epoxy resin (93% light transmittance after curing), apply it by scraping, avoiding the LED beads, and coat it on the light-emitting side of the module, controlling the coating thickness to 0.15mm; place it in a UV curing device (irradiation wavelength 405nm), and cure it at 35℃ for 60s to form a UV-cured epoxy resin layer. After curing, the surface of the epoxy resin layer is flush with the surface of the LED beads.

[0048] S3. Surface finishing: Polish the surface of the epoxy resin layer with a polishing machine to ensure that the surface is smooth and flat, and that there are no gaps or steps when it is connected to the surface of the LED beads.

[0049] S4. UV Color Printing: Using a UV digital printer (piezoelectric printhead, 1800dpi resolution), 3D stereoscopic patterns (embossed texture patterns) are printed on the surface of the epoxy resin layer (avoiding the LED bead area). By controlling the printing thickness of the UV ink (0.02-0.05mm), a three-dimensional tactile feel is formed. After printing, UV light is irradiated twice, the first irradiation for 30 seconds and the second irradiation for 20 seconds, to ensure that the 3D pattern is completely cured and tightly bonded to the epoxy resin layer.

[0050] S5. Post-processing: Perform secondary UV curing on the module, with an irradiation time of 40 seconds; spray transparent UV varnish (thickness 0.05mm), UV curing for 30 seconds to improve the scratch resistance and three-dimensionality of the 3D pattern, completing the color painting enhancement.

[0051] The effects of this embodiment are as follows: When the LED display module is off, the 3D embossed pattern has a strong three-dimensional effect, clear details, a smooth and flat surface, and outstanding overall aesthetics; when turned on, the light from the LED beads is transmitted normally, the 3D pattern is weakened by strong light, without blocking the light or affecting the display clarity, and there is no light loss; after 1200 hours of weather resistance testing, the 3D pattern has no fading or deformation, and the epoxy resin layer has no cracking or peeling, meeting the long-term use requirements of stage scenes.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A non-light-loss color painting enhancement process for display modules, characterized in that: Includes the following steps: Step S1. Pre-treatment: Clean, dry and roughen the light-emitting side surface of the LED display module; Step S2. Epoxy resin coating and UV curing: Apply UV-curable epoxy resin to the light-emitting side surface of the LED display module, avoiding all LED beads during coating, and use UV curing equipment to cure the epoxy resin to form a UV-cured epoxy resin layer. Step S3. Surface finishing: Grind and polish the UV-cured epoxy resin layer to make its surface smooth and flat; Step S4. UV Color Printing: Using UV digital printing technology, print artistic color patterns on the surface of the UV-cured epoxy resin layer (avoiding the LED bead area), and then cure with UV light after printing; Step S5. Post-processing: Perform secondary UV curing and surface protection treatment on the painted display module.

2. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S1, the roughening treatment is carried out by plasma treatment or sandblasting treatment, and the surface roughness of the module is controlled within Ra0.1-0.3μm after treatment; the drying treatment is carried out by constant temperature drying at 60-80℃ for 10-20min.

3. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S2, the epoxy resin adhesive is a transparent or semi-transparent UV-curable epoxy resin adhesive with a light transmittance of ≥90% after curing and a thickness of 0.05mm-0.3mm; the irradiation wavelength of the UV curing equipment is 365-405nm, the curing time is 30-60s, and the curing temperature is 25-35℃.

4. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S2, the connection state between the UV-cured epoxy resin layer and the LED beads is one of the following two: one is that the surface of the epoxy resin layer is flush with the surface of the LED beads; the other is that the epoxy resin layer only fills the gap between the LED beads and its height is lower than the surface of the LED beads.

5. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S4, the printing resolution of the UV digital printing process is not less than 1200dpi, and a piezoelectric printhead is used; the artistic painting pattern is a planar pattern or a 3D stereoscopic pattern, and the UV printing ink is a weather-resistant, high-adhesion UV ink.

6. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S5, the irradiation time for the secondary UV curing is 20-40 seconds; the surface protection treatment is to spray a transparent UV varnish or attach a high-transmittance transparent protective film, with a UV varnish thickness of 0.02-0.05 mm.

7. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S4, the 3D stereoscopic pattern achieves a three-dimensional tactile feel by controlling the printing thickness of the UV ink (0.02-0.05mm), and is cured by UV light irradiation twice after printing.

8. The non-light-loss color painting enhancement process for display modules according to claim 1, characterized in that: In step S2, the epoxy resin adhesive is applied by dispensing or scraping, and a masking fixture is used to precisely avoid the LED beads during the application process.