Application method of composite conductive copper foil

Abstract

The invention provides an application method of a composite conductive copper foil, and relates to the technical field of manufacturing of liquid crystal display modules, and the application method comprises the following steps: coating a transparent PET (Polyethylene Terephthalate) bottom film at a position, corresponding to a connector, of the back surface of the composite conductive copper foil, the thickness of the transparent PET bottom film is 0.03 mm, and the transparent PET bottom film forms closed coverage in a connector area so as to prevent dust and water vapor from entering the connector area; an insulating green high-temperature adhesive tape is coated on the back of the composite conductive copper foil at a position corresponding to the FPC element area, and the thickness of the insulating green high-temperature adhesive tape is 0.03 mm. According to the application method of the composite conductive copper foil, the conductivity and the insulating property of the composite conductive copper foil are stably guaranteed through an accurate coating process and windowing treatment. Strict thickness control and uniform pressure application are adopted in the coating process of the transparent PET bottom film and the insulating green high-temperature adhesive tape, so that good adhesion and electrical isolation are ensured, and short circuit or electrical interference is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of manufacturing of liquid crystal display modules, and particularly relates to an application method of a composite conductive copper foil. BACKGROUND

[0002] Liquid crystal display modules are widely used in various display devices, such as televisions, mobile phones, computer displays and the like. With the development of display technology, higher requirements are put forward for the performance and reliability of liquid crystal display modules. As one of the key materials in liquid crystal display modules, the composite conductive copper foil is mainly used for connecting electrical components and providing necessary conduction and protection functions. The composite conductive copper foil is generally composed of multiple layers of materials, including a transparent PET layer and an insulating green high-temperature adhesive tape. The transparent PET layer is usually used on the back of the composite conductive copper foil, and mainly functions to cover the connector position to prevent interference from external environmental factors such as dust and moisture, while allowing the inspection of whether the connector is normally plugged. The insulating green high-temperature adhesive tape is used for protection in the component area to prevent the conductive layer of the composite conductive copper foil from directly contacting the components, thereby avoiding display function abnormalities caused by short circuits. In the application of the composite conductive copper foil, accurate positioning and bonding of the transparent PET layer and the insulating green high-temperature adhesive tape are very crucial. Through these technical measures, the conduction and insulation performance of the copper foil can achieve the expected effect, ensuring the normal operation of the liquid crystal display module.

[0003] Although the existing technology adopts the combination of the transparent PET layer and the insulating green high-temperature adhesive tape to improve the application effect of the composite conductive copper foil, in the production, repair and maintenance process, the bonding of the materials is not always perfect, and the phenomenon of falling off or missing is prone to occur. This problem often occurs due to improper operation, environmental factors or performance problems of the materials, resulting in poor fixation of the transparent PET layer and the insulating green high-temperature adhesive tape, and further affecting the normal function of the composite conductive copper foil. SUMMARY

[0004] In view of the deficiencies of the prior art, the application provides an application method of a composite conductive copper foil, which solves the technical problem of how to ensure the stable conduction and insulation performance of the composite conductive copper foil in the liquid crystal display module by accurately coating the transparent PET base film and the insulating green high-temperature adhesive tape, and combining the laser cutting windowing technology, and prevent electrical short circuit and display abnormalities.

[0005] To achieve the above object, the application is implemented by the following technical scheme: an application method of a composite conductive copper foil, comprising:

[0006] S1. Apply a transparent PET base film on the back of the composite conductive copper foil corresponding to the connector position, the thickness of the transparent PET base film is 0.03mm, the transparent PET base film forms a closed cover in the connector area to prevent dust and water vapor from entering, and the other side of the composite conductive copper foil is provided with a coating layer;

[0007] S2. Apply an insulating green high-temperature adhesive tape on the back of the composite conductive copper foil corresponding to the FPC element area position, the thickness of the insulating green high-temperature adhesive tape is 0.03mm, the insulating green high-temperature adhesive tape completely covers the FPC element area, prevents the conductive layer of the composite conductive copper foil from contacting the element, and avoids short circuit or electrical interference;

[0008] S3. Perform windowing treatment on the front of the composite conductive copper foil, the windowing area corresponds to the area covered by the transparent PET base film and the insulating green high-temperature adhesive tape, and the windowing treatment ensures that the bonding quality of the connector and the element area can be easily checked during the assembly of the composite conductive copper foil;

[0009] S4. Through precise process control, the firm bonding of the transparent PET base film and the insulating green high-temperature adhesive tape is ensured, and the phenomenon of falling off or missing bonding during production and assembly is avoided;

[0010] S5. Assemble the treated composite conductive copper foil into a liquid crystal display module, ensure the stable conductive and insulating performance of the composite conductive copper foil in the liquid crystal display module, and prevent electrical short circuit and display abnormalities.

[0011] Preferably, the insulating green high-temperature adhesive tape has a high temperature resistance of 150-200℃, and the adhesion of the insulating green high-temperature adhesive tape is not less than 20N / 25mm within the temperature range.

[0012] Preferably, the adhesive layer of the insulating green high-temperature adhesive tape can withstand a 200℃ high temperature test for at least 200 hours.

[0013] Preferably, the windowing treatment comprises the following steps:

[0014] S31. The transparent PET base film cleans the surface of the front of the composite conductive copper foil, ensuring no dust and oil stains to improve the stability of the subsequent process;

[0015] S32. The transparent PET base film uses laser positioning to accurately position the windowing area, ensuring that the windowing area size is 2-5mm and the position is accurate;

[0016] S33. The transparent PET base film uses laser cutting to process the windowing area, and adjusts the laser power and cutting speed to ensure accurate cutting depth and clear cutting edge during laser cutting;

[0017] S34. After the transparent PET base film is cut, remove the waste generated by the windowing area to ensure that the windowing area is clean and free of impurities;

[0018] S35. The transparent PET base film uses a microscope to check the size, shape and edge smoothness of the windowing area to ensure that it meets the design requirements and avoids burrs or irregular cuts;

[0019] S36. The transparent PET base film is smoothed on the edge of the windowing area to ensure that the edge is flat and has no sharp corners to improve the adhesion of the transparent PET base film and the insulating green high-temperature adhesive tape.

[0020] Preferably, the laser power is 10W to 20W, ensuring moderate energy during cutting, the cutting speed is 100mm / s to 200mm / s, ensuring high cutting efficiency without affecting the electrical performance of the copper foil material, the laser cutting depth is 0.03mm to 0.1mm, ensuring only the composite conductive copper foil layer is cut without affecting the transparent PET base film or the insulating green high-temperature adhesive tape below, and the smoothing treatment uses laser pulses with a frequency of 500Hz to 1000Hz to ensure that the cutting edge is flat and has no burrs.

[0021] Preferably, the firm attachment of the transparent PET base film and the insulating green high-temperature adhesive tape is achieved by the following steps:

[0022] S41. Remove dust and oil from the surface of the composite conductive copper foil to ensure good adhesion between the transparent PET base film and the insulating green high-temperature adhesive tape and the composite conductive copper foil, and clean it to a cleanliness of more than 99% through ultrasonic cleaning;

[0023] S42. After the transparent PET base film and the insulating green high-temperature adhesive tape are coated, a uniform pressure is applied to the composite conductive copper foil using a roller to ensure close contact between the transparent PET base film and the insulating green high-temperature adhesive tape and the composite conductive copper foil;

[0024] S43. After applying pressure, maintain the pressure for at least 5 minutes to ensure that the adhesive layer of the transparent PET base film and the insulating green high-temperature adhesive tape is completely cured, with a temperature range of 40°C to 60°C;

[0025] S4. Quality testing is performed on the transparent PET base film and the insulating green high-temperature adhesive tape after they are attached, using a microscope to check for air bubbles, wrinkles and uneven areas, and ensuring that the adhesion strength is not less than the standard value through adhesion strength testing.

[0026] Preferably, the pressure T is controlled using the following formula:

[0027]

[0028] Wherein: F is the adhesion of the transparent PET base film and the insulating green high-temperature adhesive tape, indicating the firmness of the fit, P is the adhesion strength between the transparent PET base film and the insulating green high-temperature adhesive tape, T is the applied pressure, which needs to be uniformly distributed during the production process to ensure the fit effect. The pressure range is 0.5N / mm 2 to 1.5N / mm 2 , A is the contact area, that is, the effective contact area between the transparent PET base film and the insulating green high-temperature adhesive tape, which is usually controlled between 2mm 2 to 5mm 2 , D is the deformation amount of the composite conductive copper foil during the pressing process, indicating the elastic deformation degree of the composite conductive copper foil under external force, and smaller deformation helps to improve the fit quality.

[0029] Preferably, the resistance value of the composite conductive copper foil is not greater than 0.05Ω / ㎡.

[0030] The application provides an application method of a composite conductive copper foil. It has the following beneficial effects:

[0031] The application method of the composite conductive copper foil stabilizes the conductivity and insulation performance of the composite conductive copper foil through precise coating process and windowing treatment. The coating process of the transparent PET base film and the insulating green high-temperature adhesive tape adopts strict thickness control and uniform pressure application, ensuring good adhesion and electrical isolation, avoiding short circuit or electrical interference. In addition, precise laser cutting and pressure control ensure the high quality of the windowing area, greatly improving the stability of the assembled module, ensuring that there will be no electrical problems or display failures during long-term use.

[0032] The technical solution tests the conductivity and insulation performance of the composite conductive copper foil under high temperature and humidity, verifies its long-term stability in extreme working environment. The high temperature resistance of the insulating green high-temperature adhesive tape and the sealing performance of the transparent PET base film effectively avoid failure or damage in high temperature and humidity environment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structure schematic diagram for realizing the invention;

[0034] Figure 2 is a structure schematic diagram for realizing the invention Figure 1 , A is the contact area, that is, the effective contact area between the transparent PET base film and the insulating green high-temperature adhesive tape, which is usually controlled between 2mm to 5mm

[0035] , D is the deformation amount of the composite conductive copper foil during the pressing process, indicating the elastic deformation degree of the composite conductive copper foil under external force, and smaller deformation helps to improve the fit quality. DETAILED DESCRIPTION

[0036] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0037] Embodiment one

[0038] As shown in the figure, the embodiment of the present application provides an application method of composite conductive copper foil, comprising: S1. coating a transparent PET base film 1 on the back of the composite conductive copper foil 3 corresponding to the connector position, the thickness of the transparent PET base film 1 is 0.03mm, the transparent PET base film 1 forms a closed cover in the connector area to prevent dust and water vapor from entering, and the other side of the composite conductive copper foil 3 is provided with a coating layer 4. Figures 1-2

[0039] S2. Coating an insulating green high-temperature adhesive tape 2 on the back of the composite conductive copper foil 3 corresponding to the FPC element area position, the thickness of the insulating green high-temperature adhesive tape 2 is 0.03mm, the insulating green high-temperature adhesive tape 2 completely covers the FPC element area, prevents the conductive layer of the composite conductive copper foil 3 from contacting the element, avoids short circuit or electrical interference, the insulating green high-temperature adhesive tape 2 has a high-temperature resistance of 150℃-200℃, the adhesion of the insulating green high-temperature adhesive tape 2 is not less than 20N / 25mm in the temperature range, and the adhesive layer of the insulating green high-temperature adhesive tape 2 can withstand a 200℃ high-temperature test for at least 200 hours.

[0040] S3. Opening window treatment is performed on the front surface of the composite conductive copper foil 3, the resistance value of the composite conductive copper foil 3 is not greater than 0.05Ω / ㎡, the opening window area corresponds to the area covered by the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2, and the opening window treatment ensures that the bonding quality of the connector and the element area can be easily checked during the assembly process of the composite conductive copper foil 3, and the opening window treatment comprises the following steps:

[0041] S31. The transparent PET base film 1 is cleaned on the front surface of the composite conductive copper foil 3 to ensure that there is no dust and oil stains to improve the stability of the subsequent process.

[0042] S32. The transparent PET base film 1 is positioned and opened in the window area using laser positioning to ensure that the opening window area size is 2mm to 5mm and the position is accurate.

[0043] ​S33. The transparent PET base film 1 is processed using laser cutting to open the window area. During laser cutting, the laser power and cutting speed are adjusted to ensure accurate cutting depth and clear cutting edges. The laser power is 10W to 20W, ensuring moderate energy during cutting. The cutting speed is 100mm / s to 200mm / s, ensuring high cutting efficiency without affecting the electrical performance of the copper foil material. The depth of laser cutting is 0.03mm to 0.1mm, ensuring that only the composite conductive copper foil 3 is cut, without affecting the underlying transparent PET base film or insulating green high-temperature adhesive tape. Smooth processing is adopted, using laser pulses with a frequency of 500Hz to 1000Hz to ensure smooth and burr-free cutting edges.

[0044] S34. After cutting the transparent PET base film 1, remove the waste generated by the window area to ensure that the window area is clean and free of impurities.

[0045] S35. The transparent PET base film 1 is inspected using a microscope to check the size, shape and edge smoothness of the window area, ensuring that it meets the design requirements and avoids burrs or irregular cuts.

[0046] S36. The edges of the transparent PET base film 1 are smoothed to ensure smooth edges and no sharp corners, improving the adhesion of the transparent PET base film and the insulating green high-temperature adhesive tape.

[0047] S4. Quality testing is performed on the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 after lamination. A microscope is used for inspection to ensure that there are no bubbles, wrinkles or uneven areas. Adhesion strength is tested to ensure that it is not less than the standard value. The firm lamination of the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 is achieved through the following steps:

[0048] S41. Dust and oil on the surface of the composite conductive copper foil 3 are removed to ensure good adhesion between the transparent PET base film 1, the insulating green high-temperature adhesive tape 2 and the composite conductive copper foil 3. Ultrasonic cleaning is used and the cleanliness requirement is above 99%.

[0049] S42. After coating the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2, uniform pressure is applied to the composite conductive copper foil using a roller to ensure close contact between the transparent PET base film 1, the insulating green high-temperature adhesive tape 2 and the composite conductive copper foil 3.

[0050] S43. After applying pressure, the pressure is maintained for at least 5 minutes to ensure that the adhesive layer of the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 is completely cured. The temperature range is maintained at 40°C to 60°C. The pressure T is controlled using the following formula:

[0051]

[0052] Where: F is the adhesion between the transparent PET base film 1 and the insulating green high-temperature tape 2. Unit: N, indicating the degree of adhesion. P is the adhesion strength between the transparent PET base film 1 and the insulating green high-temperature tape 2. Unit: N / mm 2 , usually determined by the viscosity of the glue and its molecular structure, T is the applied pressure unit: N / mm 2 , it needs to be evenly distributed during the production process to ensure the fit. The pressure range is 0.5N / mm 2 Up to 1.5N / mm 2 , A is the contact area unit: mm 2 , that is, the effective contact area between the transparent PET base film 1 and the insulating green high-temperature tape 2, which is usually controlled at 2mm 2 Up to 5mm 2 D is the deformation of the composite conductive copper foil 3 during the lamination process (unit: mm), indicating the degree of elastic deformation of the composite conductive copper foil 3 under the action of external force. A smaller deformation, usually ≤ 0.1 mm, helps improve the lamination quality.

[0053] S4. Through precise process control, ensure the firm adhesion of transparent PET base film 1 and insulating green high-temperature tape 2 to avoid falling off or missing during production and assembly.

[0054] S5. Assembling the treated composite conductive copper foil 3 into a liquid crystal display module to ensure that the conductive and insulating properties of the composite conductive copper foil 3 in the liquid crystal display module are stable, thereby preventing electrical short circuits and display abnormalities.

[0055] Example 2

[0056] A specific implementation method written according to step S1. This implementation method includes detailed technical data to ensure operability and compliance with the description requirements of the patent.

[0057] S1. Transparent PET base film coating steps:

[0058] The transparent PET base film 1 is coated on the back of the composite conductive copper foil 3 at the position corresponding to the connector. The specific implementation method of this step is as follows:

[0059] Selection of transparent PET base film 1: A highly transparent, high-temperature resistant PET film is selected as the base film material. The thickness of the transparent PET base film 1 is 0.03 mm. The transparent PET base film 1 must have good tear resistance and mechanical strength to ensure that it will not be easily damaged during the assembly process of the composite conductive copper foil 3.

[0060] Coating process:

[0061] The transparent PET base film 1 is uniformly coated on the back of the composite conductive copper foil 3 using an automatic coater. The coating process adopts a hot pressing process, with a temperature setting of 80-100°C and a pressure control of 0.5 MPa, to ensure the sufficient adhesion of the transparent PET base film 1.

[0062] During the coating process, the edges of the transparent PET base film 1 are ensured to completely cover the connector position area, forming a closed covering layer to prevent any dust and moisture from entering, thereby protecting the connector from external environmental factors. After coating, the transparent PET base film 1 is dried in a drying oven with a temperature setting of 90°C for 30 minutes, ensuring that the transparent PET base film 1 is completely cured and maintains its stability.

[0063] Thickness and closure control:

[0064] The thickness of the transparent PET base film 1 is strictly controlled within the range of 0.03 mm ± 0.005 mm to ensure that it has good mechanical strength and insulation performance in the working environment.

[0065] In the connector area, the transparent PET base film 1 is ensured to be completely covered around the connector, avoiding the invasion of air, dust or moisture due to uneven film.

[0066] Coating effect detection:

[0067] The quality of the transparent PET base film 1 coating is checked using a microscope, with special attention to the edge part of the connector area, ensuring that there are no cracks, bubbles and wrinkles, and ensuring its integrity and closure effect.

[0068] The adhesion layer of the transparent PET base film 1 and the composite conductive copper foil 3 is checked by X-ray perspective detection, ensuring that its adhesion is above 80% to avoid the occurrence of peeling phenomenon.

[0069] Environmental adaptability test:

[0070] After the transparent PET base film 1 is coated, a high temperature and humidity test is performed, exposing the sample to an environment of 85°C / 95% humidity for 72 hours, to ensure that the transparent PET base film 1 does not exhibit thermal expansion or failure phenomenon in extreme environments.

[0071] Through the above implementation steps, the transparent PET base film 1 is successfully coated on the back of the composite conductive copper foil 3 at the connector position, ensuring that it has good closure to prevent dust and moisture from entering, and improving the durability and stability of the composite conductive copper foil 3. This coating method not only ensures the adhesion strength of the material and the uniformity of the film layer, but also ensures the stability of the coating quality and performance through high-precision testing means, meeting the requirements of high-precision electronic component assembly.

[0072] Example Three

[0073] This embodiment ensures that the insulating green high-temperature adhesive tape is coated on the back surface FPC element area of the composite conductive copper foil 3 by the following steps, using a precise coating process to ensure complete coverage and meet the stability requirements under high-temperature environment. Through multiple tests on the adhesion, high-temperature resistance and electrical isolation performance of the adhesive tape, it is ensured that the adhesive tape can work stably for a long time in the liquid crystal display module, preventing any short circuit or electrical failure.

[0074] S2. Insulating green high-temperature adhesive tape 2 coating step

[0075] The insulating green high-temperature adhesive tape 2 coating process is carried out at the position corresponding to the FPC element area on the back surface of the composite conductive copper foil 3. The specific implementation of this step is as follows:

[0076] Selection of insulating green high-temperature adhesive tape: Select a green high-temperature adhesive tape 2 that is resistant to high temperature and corrosion, has good adhesion and stability, especially in high-temperature environment, to ensure that it does not lose its insulating properties during long-term use. The thickness of the insulating green high-temperature adhesive tape is 0.03mm, ensuring its requirements in physical strength and electrical isolation performance.

[0077] Adhesive tape coating process:

[0078] Automatic coating equipment: Use a precise automatic coating machine to uniformly coat the insulating green high-temperature adhesive tape 2 on the back surface FPC element area position of the composite conductive copper foil 3. During the coating process, the width and length of the adhesive tape are customized according to the actual size of the FPC element area.

[0079] Temperature control during coating: Ensure that the working environment temperature is 25℃ and the relative humidity is controlled within the range of 40%-60% during coating, to avoid the influence of external environment on the adhesion of the adhesive tape.

[0080] Pressure control: Use a slight pressure of 0.3MPa to ensure that the adhesive tape is flat and bubble-free during coating, to avoid uneven adhesion during the pasting process.

[0081] Coating area precision control:

[0082] During the coating of the adhesive tape, ensure that the insulating green high-temperature adhesive tape 2 completely covers the FPC element area and that the edges are evenly covered without any omissions.

[0083] The edges of the adhesive tape should be completely aligned with the FPC element area to avoid any partial loss of insulating effect.

[0084] Adhesive tape adhesion test:

[0085] Shear strength test: The adhesion of the coated tape is tested according to ASTM D3330 standard to ensure that the shear strength of the tape is not less than 5N / 25mm, so as to ensure that it will not fall off during use.

[0086] Peeling test: The coated tape sample is subjected to peeling test to ensure that the peeling force is within 10N / 25mm, so as to ensure that there is no peeling or tape failure during long-term use of the product.

[0087] Environmental adaptability test:

[0088] After coating, the sample needs to be subjected to high temperature test, which is placed in an environment of 150°C for 72 hours, so as to ensure the stability of the tape in high temperature environment, without problems such as peeling, discoloration or degradation of the adhesive layer.

[0089] At the same time, the sample is subjected to damp heat test, which is placed in an environment of 85°C / 95% relative humidity for 48 hours, so as to test its electrical isolation performance in a damp heat environment.

[0090] Inspection and verification:

[0091] The quality of the tape coating is inspected using a microscope to ensure that the tape covers the FPC element area completely and has no bubbles or wrinkles.

[0092] X-ray perspective detection technology is used to ensure that the coating layer of the tape has no bubbles or uneven parts, achieving 100% coverage.

[0093] Example Four

[0094] S3. Windowing process step

[0095] The windowing process is performed on the front surface of the composite conductive copper foil 3, which includes the following steps:

[0096] S31. Clean the surface of the transparent PET base film 1:

[0097] Purpose of cleaning: Before performing the windowing process on the front surface of the composite conductive copper foil 3, the surface of the transparent PET base film 1 is first cleaned to ensure that there is no dust, oil stains and other impurities, so as to improve the stability and cutting effect of the subsequent laser cutting process.

[0098] Cleaning method: The transparent PET base film 1 is cleaned using an ultrasonic cleaning machine, and deionized water and a small amount of surfactant are used as cleaning liquid. The cleaning time is set to 5 minutes, and then the surface of the transparent PET base film 1 is blown dry using a clean air gun.

[0099] Inspection after cleaning: The surface of the transparent PET base film 1 is inspected using an optical microscope to ensure that there is no residue after cleaning, and the surface is smooth, suitable for precise laser cutting.

[0100] S32. Accurate positioning of the windowing area using a laser positioning system. The laser positioning system is used to determine the position and size of the windowing area. The size of the windowing area is 3mm, ensuring the accuracy of the windowing area and ensuring that the windowing area is aligned with the coverage area of the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2.

[0101] Positioning accuracy: The error range of the laser positioning system is controlled within **±0.05mm**, ensuring the accuracy of the windowing area.

[0102] S33. Laser cutting of the windowing area

[0103] Laser cutting equipment: A high-precision CO2 laser cutting machine is used to perform the cutting process of the windowing area.

[0104] Cutting parameters:

[0105] The laser power is set to 15W to ensure that the laser energy is moderate and does not generate excessive heat, avoiding thermal damage to the composite conductive copper foil 3.

[0106] The cutting speed is 150mm / s to ensure the efficiency of the cutting process and ensure the cutting accuracy.

[0107] The cutting depth is 0.05mm, ensuring that only the composite conductive copper foil 3 is cut, without affecting the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 below, avoiding damage to the underlying materials.

[0108] The laser pulse frequency is set to 800Hz, which ensures that the cutting edge is smooth and burr-free, improving the cutting quality and reducing the need for post-processing.

[0109] Quality inspection after cutting: After cutting, a microscope is used to inspect the cutting edge to ensure that the windowing area edge is smooth and burr-free, and the cutting depth meets the requirements, without affecting the integrity of the base film and adhesive tape.

[0110] S34. Remove waste and clean the windowing area

[0111] Waste removal: Use a dust collection device and air flow blowing device to remove the waste generated around the windowing area, ensuring that the tiny debris and dust generated during the cutting process are completely removed, avoiding the impact of residual materials on subsequent processes.

[0112] Cleaning confirmation: After cleaning, the windowing area is again inspected using a microscope and infrared detector to ensure that there is no residual waste or impurities, ensuring that the transparent PET base film 1 surface is clean and suitable for subsequent assembly and functional testing.

[0113] The above implementation steps ensure that when the transparent PET base film 1 is windowed on the front side of the composite conductive copper foil 3, the cutting parameters and precision are strictly controlled. Through precise laser cutting and fine waste removal, the size, shape and position of the windowed area are accurate, the edge is smooth and free of burrs, avoiding any adverse effects on the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2. The control of the cutting depth ensures that only the composite conductive copper foil 3 is cut, without affecting the function of other layers. Through strict cleaning and detection, the cleanliness, integrity and applicability of the windowed area are ensured, ensuring the stability and reliability of the composite conductive copper foil 3 in the subsequent assembly process.

[0114] Example Five

[0115] The embodiments of the present application further comprise the following steps:

[0116] S4. Quality detection step of transparent PET base film 1 and insulating green high-temperature adhesive tape 2 after lamination

[0117] After the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 are coated and laminated, quality detection is performed to ensure their adhesion and lamination effect. The specific steps are as follows:

[0118] S41. Clean the surface of the composite conductive copper foil 3:

[0119] Purpose of cleaning: remove dust and oil on the surface of the composite conductive copper foil 3 to ensure that the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 can adhere well to the composite conductive copper foil 3, preventing poor adhesion due to surface contamination.

[0120] Cleaning method: use an ultrasonic cleaning machine, the cleaning liquid is deionized water and a small amount of surfactant, and the cleaning time is 5 minutes. After cleaning, the cleanliness is ensured to be more than 99%, and a clean air gun is used for blow-drying to ensure that the surface of the composite conductive copper foil 3 is free of moisture and impurities.

[0121] S42. Apply uniform pressure: Pressure application method: after coating the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2, use a roller to apply uniform pressure to the composite conductive copper foil 3. The pressure of the roller is set to 0.3 MPa, and the pressure applied is evenly distributed throughout the surface. Roller pressure time and frequency: the roller pressure time is 5 minutes, and the pressure is kept constant to ensure the close contact between the transparent PET base film 1 and the insulating green high-temperature adhesive tape 2 and the composite conductive copper foil 3, and to prevent the occurrence of bubbles and uneven areas.

[0122] S43. Maintain pressure and solidify:

[0123] Pressure maintenance: After the roller pressing is applied, maintain the pressure for at least 5 minutes to ensure that the transparent PET base film 1 and the adhesive layer of the insulating green high-temperature tape 2 are fully cured, avoiding insecure fitting due to insufficient pressure.

[0124] Temperature control: Maintain the environmental temperature between 30°C and 40°C to ensure that the glue can achieve the best effect during the curing process, avoiding the influence of high or low temperature on the curing effect.

[0125] Pressure formula control:

[0126] The applied pressure is controlled by the following formula:

[0127] P = F / A

[0128] Where: P is the adhesion between the transparent PET base film 1 and the insulating green high-temperature tape 2 (N), F is the applied pressure (N), usually set by the pressing equipment required by the production process. A is the effective contact area between the transparent PET base film 1 and the insulating green high-temperature tape 2 (㎡). This area is generally controlled between 0.02㎡ and 0.05㎡ to ensure sufficient contact and uniform pressure distribution. The deformation amount of the composite conductive copper foil 3: under this pressure, the elastic deformation amount of the composite conductive copper foil 3 should be controlled within 0.05mm to ensure uniform pressure distribution and avoid excessive deformation of the copper foil.

[0129] S44. Quality detection:

[0130] Microscopic examination: Use an optical microscope to check the fitting quality of the transparent PET base film 1 and the insulating green high-temperature tape 2, ensuring that there are no bubbles, wrinkles, and uneven areas. The magnification for inspection is 100 times to ensure that the fitting surface is completely flat.

[0131] Adhesion test: Use a shear force tester to test the adhesion strength of the transparent PET base film 1 and the insulating green high-temperature tape 2, ensuring that its adhesion is not less than 6N / 25mm, meeting the standard requirements. The adhesion test is carried out according to the ASTM D3330 standard to ensure that the adhesion performance meets the stability requirements for long-term use. The above embodiments ensure the firm fitting of the transparent PET base film 1 and the insulating green high-temperature tape 2 with the composite conductive copper foil 3, strictly controlling the technical parameters of each step, including cleanliness, pressure, time, temperature, and specific test standards for adhesion. Through ultrasonic cleaning, precise roller pressing and constant temperature control, the high-quality fitting of the transparent PET base film 1 and the insulating green high-temperature tape 2 is ensured, avoiding the phenomenon of falling off or missing during production and assembly.

[0132] Example Six

[0133] S51. Conductive performance test:

[0134] Conductivity Test: Before assembling the composite conductive copper foil 3, its conductivity is first tested to ensure that its resistance value is not greater than 0.05 Ω / m2. The test uses the four-probe method for resistance measurement, and the surface of the composite conductive copper foil 3 is kept clean during the test to avoid external impurities interfering with the test results.

[0135] Test Environment Control: The resistance test is conducted at room temperature (23°C ± 2°C) and the environmental humidity is maintained between 40%-60% to avoid the influence of humidity on the resistance value. The test process is ensured to be highly accurate by using an automated resistance tester.

[0136] Acceptance Criteria: Ensure that the resistance value meets not more than 0.05 Ω / m2 to ensure normal current flow in the module and avoid electrical failures caused by excessive resistance.

[0137] S52. Insulation Performance Test:

[0138] Insulation Resistance Test: Before assembly, the insulation resistance of the composite conductive copper foil 3 is first tested to ensure that its insulation resistance is not less than 10^9 Ω. This test uses a high-voltage insulation resistance tester with a test voltage of 500VDC.

[0139] Test Environment Control: The test is conducted at 25°C and 50% relative humidity to ensure that the test results are not affected by environmental factors. This insulation resistance value ensures that the insulation performance of the composite conductive copper foil 3 is not affected under long-term working conditions, avoiding short circuit phenomena.

[0140] Insulation Performance Standard: Ensure that the insulation resistance reaches 10^9 Ω or above under high-voltage testing, ensuring that the liquid crystal display module can still work stably under high temperature, high humidity and other environments.

[0141] S53. Assembly Steps:

[0142] Composite Conductive Copper Foil 3 Positioning: Use precision positioning tools to accurately place the composite conductive copper foil 3 in the position of the liquid crystal display module. Align the connector area and component area to ensure good contact between the composite conductive copper foil 3 and the connectors and other components.

[0143] Apply Uniform Pressure: During assembly, use an automated pressing machine to apply uniform pressure to the composite conductive copper foil 3. The pressing pressure is set to 0.3 MPa to ensure that the composite conductive copper foil 3 is in close contact with other components of the liquid crystal display module.

[0144] Pressure Application Time: The pressing time is controlled within 5 minutes to ensure that the pressure is sufficient and evenly distributed.

[0145] Temperature Control: During assembly, ensure that the temperature is maintained at 25°C ± 2°C, and use temperature and humidity control equipment to prevent temperature and humidity changes from negatively affecting the assembly process.

[0146] S54. Inspection and Verification:

[0147] Electrical Inspection: After assembly, use automated test equipment to inspect the electrical connectivity of the composite conductive copper foil 3, ensuring that the electrical performance of the connector positions is normal and there is no short circuit phenomenon. During the inspection process, use a current detector to confirm the stability of the current conduction path.

[0148] Functional Detection: After assembly is complete, perform a functional test to simulate the working state of the liquid crystal display module, ensuring that the display function of the liquid crystal display module is normal and that there is no display abnormality caused by poor conduction or insulation failure.

[0149] High Temperature and High Humidity Test: After assembly is complete, perform a high temperature and high humidity test by placing the liquid crystal display module in an environment of 85°C and 95% relative humidity for 48 hours to verify the long-term stability and reliability of the composite conductive copper foil 3 under extreme environmental conditions.

[0150] S55. Quality Control and Traceability:

[0151] Production Records and Traceability: Each liquid crystal display module assembly process is recorded in detail to ensure that the electrical performance, insulation performance, assembly pressure, temperature, and other data of each module can be traced back for traceability in case of quality problems in the future. Final Product Inspection: After the liquid crystal display module assembly is complete, perform 100% final quality inspection to ensure that all products meet the standard requirements and do not have electrical faults or display abnormalities.

[0152] Through the above specific implementation steps, the electrical conductivity and insulation performance of the composite conductive copper foil 3 in the liquid crystal display module are effectively guaranteed. Precise resistance testing and insulation resistance testing ensure the long-term stability of the copper foil, uniform pressure application and precise assembly process ensure good electrical contact and stable performance. Through multiple tests, the stability of the composite conductive copper foil 3 under extreme environments is verified, ultimately ensuring that the liquid crystal display module does not have electrical short circuits and display abnormalities during long-term use.

[0153] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for applying a composite conductive copper foil, characterized in that: include: S1. A transparent PET base film (1) is coated on the back side of the composite conductive copper foil (3) at the position corresponding to the connector, wherein the thickness of the transparent PET base film (1) is 0.03 mm, and the transparent PET base film (1) forms a closed cover in the connector area, and a coating (4) is provided on the other side of the composite conductive copper foil (3); S2. Coating an insulating green high-temperature tape (2) on the back side of the composite conductive copper foil (3) at a position corresponding to the FPC component area, wherein the insulating green high-temperature tape (2) has a thickness of 0.03 mm and the insulating green high-temperature tape (2) completely covers the FPC component area; S3. A window is opened on the front side of the composite conductive copper foil (3), wherein the window area corresponds to the area covered by the transparent PET base film (1) and the insulating green high-temperature tape (2); S4. Through precise process control, ensure the firm fit of the transparent PET base film (1) and the insulating green high-temperature tape (2); S5. Assembling the treated composite conductive copper foil (3) into a liquid crystal display module to ensure that the conductive and insulating properties of the composite conductive copper foil in the liquid crystal display module are stable.

2. The method for applying the composite conductive copper foil according to claim 1, wherein: The insulating green high-temperature adhesive tape (2) has a high-temperature resistance of 150° C. to 200° C., and the adhesion of the insulating green high-temperature adhesive tape (2) is not less than 20N / 25mm within the temperature range.

3. The application method of the composite conductive copper foil according to claim 1, characterized in that: The adhesive layer of the insulating green high-temperature adhesive tape (2) can withstand a high-temperature test of 200° C. for at least 200 hours.

4. The method for applying the composite conductive copper foil according to claim 1, wherein: The windowing process comprises the following steps: S31. Clean the transparent PET base film (1) on the front surface of the composite conductive copper foil to ensure that there is no dust or oil; S32. The transparent PET base film (1) uses laser positioning to accurately locate the window area, ensuring that the window area size is 2mm to 5mm and the position is accurate; S33. The transparent PET base film (1) is processed by laser cutting on the window area, when the laser cutting; S34. After the transparent PET base film (1) is cut, the waste generated in the window area is removed; S35. Transparent PET base film (1) Use a microscope to check the size, shape and edge smoothness of the window area; S36. The transparent PET base film (1) is smoothed at the edges of the window area to ensure that the edges are flat and have no sharp corners.

5. The method for applying the composite conductive copper foil according to claim 4, wherein: The laser power is 10W to 20W, ensuring moderate energy during the cutting process. The cutting speed is 100mm / s to 200mm / s. The smoothing process uses laser pulses, and the laser pulse frequency is 500Hz to 1000Hz, ensuring that the cutting edge is smooth and free of burrs.

6. The method for applying the composite conductive copper foil according to claim 1, wherein: The transparent PET base film (1) and the insulating green high-temperature tape (2) are firmly attached to each other by the following steps: S41. Remove dust and oil from the surface of the composite conductive copper foil (3) by ultrasonic cleaning and the cleanliness requirement is 99% or more; S42. After the transparent PET base film (1) and the insulating green high-temperature adhesive tape (2) are coated, a uniform pressure is applied to the composite conductive copper foil using a roller pressing method to ensure close contact between the transparent PET base film (1) and the insulating green high-temperature adhesive tape (2) and the composite conductive copper foil; S43. After applying pressure, maintain the pressure for at least 5 minutes to ensure that the adhesive layer of the transparent PET base film (1) and the insulating green high-temperature tape (2) is completely cured, and the temperature range is maintained at 40°C to 60°C; S4. Perform a quality inspection on the laminated transparent PET base film (1) and the insulating green high-temperature tape (2) using a microscope to ensure that there are no bubbles, wrinkles, or uneven areas.

7. The application method of the composite conductive copper foil according to claim 6, characterized in that: The pressure T is controlled by the following formula: Where: F is the adhesion force between the transparent PET base film and the insulating green high-temperature tape, indicating the firmness of the bonding; P is the adhesion strength between the transparent PET base film and the insulating green high-temperature tape; A is the contact area; and D is the deformation of the composite conductive copper foil during the lamination process.

8. The application method of the composite conductive copper foil according to claim 1, characterized in that: The resistance value of the composite conductive copper foil (3) is not greater than 0.05Ω / ㎡.

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