Capacitive touch toughened glass panel and production process thereof

Abstract

The application belongs to the technical field of toughened glass deep processing, and particularly relates to a capacitive touch toughened glass panel and a production process thereof. The production process of the capacitive touch toughened glass panel comprises the following steps: S1, tin surface cleaning; S2, stamping treatment; S3, air surface cleaning; S4, air blowing cleaning; S5, coating film on the surface of the toughened glass by using a spray pyrolysis method, and then annealing treatment; S6, fixing a projected capacitive sensor on the coated surface of the toughened glass, using UV shadowless glue to adhere, and curing by using an LED surface light source; S7, signal processing; S8, running driving and precision calibration; S9, spray treatment by using insulating ink; S10, curing treatment on the insulating ink layer to obtain a finished product. The spray pyrolysis method is used to replace the traditional magnetron sputtering, and the equipment investment and operation cost are lower, and the method has advantages of economy and film thickness uniformity, especially in the application of large-size glass.

Description

Technical Field

[0001] This invention relates to a capacitive touch tempered glass panel and its manufacturing process, belonging to the field of tempered glass deep processing technology. Background Technology

[0002] With the widespread adoption of smart terminal devices, capacitive touchscreens have become widely used due to their superior user experience. Tempered glass, with its high strength and transparency, is often used as the cover glass for touchscreens. Traditional manufacturing processes typically involve depositing an indium tin oxide (ITO) conductive film on the glass using magnetron sputtering, followed by photolithography and etching to fabricate sensing electrodes, and finally lamination and encapsulation. However, traditional processes have several limitations: First, insufficient optical performance. Magnetron sputtering can easily lead to uneven film thickness, producing optical interference phenomena such as Newton's rings and rainbow patterns, affecting visual effects and light transmission uniformity. Second, limited touch performance. The mismatch in refractive index between the electrodes and the glass substrate can result in touch dead zones or signal attenuation. Third, poor reliability and durability. Improper curing of the insulating protective layer can easily lead to insufficient coating adhesion, causing cracking and peeling under high temperature and humidity or thermal shock environments, resulting in product failure. Finally, the production cost is high. Magnetron sputtering equipment is expensive, the process is complex and energy-intensive, and it is difficult to ensure the uniformity of the film layer on large-size substrates, resulting in low yield and high cost.

[0003] Therefore, there is an urgent need for a tempered glass capacitive touch interface product and its manufacturing method that can take into account excellent optical performance, superior touch sensitivity, high environmental reliability, and reduce production costs. Summary of the Invention

[0004] To address the aforementioned deficiencies in the prior art, this invention provides a capacitive touch tempered glass panel and its manufacturing process.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: One objective of this invention is to provide a manufacturing process for a capacitive touch tempered glass panel, comprising the following steps: S1. Clean the tin surface of the tempered glass; S2. The cleaned tempered glass is subjected to an imprinting process, which includes nanoimprinting and curing using an LED surface light source. S3. Clean the air surface of the tempered glass after the embossing process; S4. Use an air gun to blow air to clean the surface of the tempered glass after cleaning; S5. A coating is applied to the cleaned tempered glass surface using a spray pyrolysis method, followed by annealing. S6. Fix the projected capacitive sensor on the coated surface of the tempered glass, bond it with UV shadowless adhesive, and cure it with an LED surface light source. S7. Use a touch IC to process sensor signals; S8. Run the driver and perform accuracy calibration; S9. Use insulating ink for spray coating; S10. The insulating ink layer is cured to obtain the finished product.

[0006] Based on the above technical solution, the present invention can also be improved as follows: Furthermore, in step S2, the imprinting process uses an LED surface light source for curing, and the energy of the LED surface light source is 300 mJ / cm². 2 -400mJ / cm 2 .

[0007] Furthermore, in step S5, the precursor solution used in the spray pyrolysis method is a tin-doped indium oxide solution with a concentration of 0.1 mol / L-0.3 mol / L, a spraying distance of 20 cm-30 cm, a spraying pressure of 0.2 MPa-0.5 MPa, and a tempered glass preheating temperature of 300℃-350℃.

[0008] Furthermore, in step S5, the annealing process is carried out in an air or nitrogen atmosphere, with an annealing temperature of 230℃-350℃ and an annealing time of 30min-60min.

[0009] Furthermore, in step S6, the electrode linewidth of the projected capacitive sensor is ≤0.2mm, the alignment accuracy is ≤0.1mm, and a 450mj / cm² sensor is used. 2 -550mj / cm 2 The LED surface light source is cured.

[0010] Furthermore, in step S10, the curing process is carried out in stages, including pre-curing, main curing, and deep curing under nitrogen protection.

[0011] Furthermore, in step S10, the curing process specifically includes: Using an energy of 150 mJ / cm 2 -250mj / cm 2 The 365nm LED light source is pre-cured; Using an energy of 350 mJ / cm 2 -450mJ / cm 2 The 385nm LED light source is used for main curing; Using an energy of 750 mJ / cm 2-880mj / cm 2 The high-pressure UV lamp performs deep curing under a nitrogen atmosphere.

[0012] Furthermore, in step S4, an air gun with a pressure ≤0.5MPa is used for air blowing cleaning.

[0013] Furthermore, in step S8, the accuracy calibration adopts the nine-point calibration method, and the touch linearity error after calibration is ≤1mm.

[0014] The second objective of this invention is to provide a capacitive touch tempered glass panel, which is manufactured by the above-mentioned production process, has a light transmittance of ≥92%, a sheet resistance of ≤100Ω / sq, and can pass an aging test of 500 hours at 85°C and 85% relative humidity without performance degradation.

[0015] The beneficial effects of this invention are as follows: 1. Superior optical performance: This invention optimizes the flatness and refractive index matching of the substrate surface through imprinting, and combined with spray pyrolysis coating, effectively eliminates Newton's rings and rainbow patterns, achieving a visual effect with a light transmittance of ≥92% and extremely low haze. The electrodes are invisible, and the overall appearance is clear and uniform.

[0016] 2. Excellent touch performance: This invention achieves a high-speed (response time <8ms) and high-precision (error ≤1mm) touch experience by combining a precise sensor fixing process (alignment accuracy ≤0.1mm) with a high-performance touch IC (such as FT5336), and has passed the electromagnetic interference test.

[0017] 3. Extremely high environmental reliability and durability. The innovative staged curing process of this invention ensures extremely strong adhesion between the insulating ink layer and the substrate (4B in cross-cut adhesion test). The product can withstand harsh environmental tests such as thermal shock (-40℃ to 85℃) and high temperature and humidity aging, and its lifespan is greatly improved.

[0018] 4. Significant cost advantages: This invention uses a spray pyrolysis method to replace the traditional magnetron sputtering, resulting in lower equipment investment and operating costs. It is especially economical and has advantages in film thickness uniformity in large-size glass applications. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram showing the appearance of the tempered glass produced in Comparative Example 3.

[0021] Figure 3 This is a schematic diagram showing the appearance of the tempered glass produced in Embodiment 2 of the present invention. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0023] Example 1 See Figure 1 A manufacturing process for a capacitive touch tempered glass panel includes the following steps; Step S1: Clean the tin surface of the tempered glass.

[0024] Step S2: Perform an imprinting process (MI layer treatment) on the cleaned tempered glass. The imprinting process specifically includes the following steps: Specific implementation methods of nanoimprint processing: 1. Template selection and parameters: Template type: Use rigid quartz templates with nanoscale structures (UV-NIL templates) or soft PDMS templates (thermal embossing); Template pattern: Based on the design of the touch sensor electrodes, the template is engraved with a diamond grid structure with a line width ≤0.2μm and a depth of 100–200nm. The period is matched with the spacing between the sensor electrodes (such as a micro-nano composite structure with a macroscopic period of 5mm). Template surface treatment: Use a fluorosilane-based anti-stick coating (such as Trichloro (1H, 1H, 2H, 2H-perfluorooctyl) silane) to ensure smooth demolding and avoid residue; 2. Imprinting adhesive material: Use UV-curable nanoimprint adhesive (such as PAK-01 or similar models) with a refractive index that matches glass (n≈1.5–1.6), viscosity ≤100 cP, good flowability and controlled curing shrinkage (≤5%). 3. Imprinting process flow: Adhesive coating: Use spin coating or slot coating to evenly coat the tin surface of tempered glass with imprinting adhesive, and control the adhesive layer thickness to 500–800 nm. Imprinting: Align the template with the adhesive surface, apply pressure of 0.5–1.0 MPa, and hold for 10–20 seconds to ensure that the adhesive fully fills the template microstructure; Curing: LED surface light source (wavelength 365nm, energy 300–400mj / cm²) 2 Exposure and curing are performed for 5–10 seconds. In this embodiment, the energy of the LED surface light source is 350 mJ / cm². 2 ; Demolding: Slowly separate the template from the glass substrate to avoid structural damage and check the integrity of the imprinted structure; 4. Quality Control and Testing: The depth, linewidth, and uniformity of the imprinted structure were examined using an atomic force microscope (AFM) or a white light interferometer. The imprinted structure must be intact and free of defects, with a surface roughness Ra≤5nm, to ensure the flatness and optical performance of subsequent coating and sensor bonding; Step S3: Clean the air surface of the tempered glass after the embossing process in step S2 with a water washing machine. After cleaning, there should be no water stains on the surface.

[0025] Step S4: Clean the surface of the tempered glass obtained in step S3 using an air gun to remove impurities. The air gun pressure should not exceed 0.5 MPa.

[0026] Step S5: Apply a coating to the tempered glass surface after cleaning in step S4 using a spray pyrolysis method, followed by annealing; specifically including the following steps: Step S5.1: Apply a coating to the tempered glass obtained in step S4 using a spray pyrolysis method. Precursor solution: Composition: Tin-doped indium oxide (ITO) precursor (indium chloride InCl3 + tin chloride SnCl4, solvent is deionized water / ethanol mixture); Concentration: 0.2 mol / L, to ensure film uniformity; Spraying equipment: Spray gun type: Ultrasonic atomizing spray gun (atomized particle size ≤10μm); Spraying pressure: 0.3MPa, to ensure uniform atomization; Substrate temperature: Preheating temperature of tempered glass substrate: 300℃; Spraying process: Spraying speed: 10cm / s, spray 3-5 times to control film thickness; Spraying distance: 20cm, to avoid droplet splashing or uneven film formation; Film properties: Target film thickness: 70nm; Square resistance: ≤100Ω / sq; Step S5.2: Anneal the tempered glass obtained in step S5.1 to improve its crystallinity and conductivity. Annealing temperature: 300℃, which is connected to the spraying pyrolysis temperature to avoid thermal stress causing glass deformation; Annealing time: 30 minutes, to improve the crystallinity and conductivity of the film; Annealing environment: air or nitrogen atmosphere to prevent oxidation of impurities.

[0027] Step S6: Fix the projected capacitive sensor onto the coated surface of the tempered glass obtained in step S5, bond it using UV-curing adhesive, and cure it using an LED surface light source. Specifically, this includes the following steps: Step S6.1: Fix the projected capacitive sensor onto the tempered glass coated surface (i.e., the air surface) obtained in step S5.2. The electrode pattern is a diamond grid (line width 0.2mm, spacing 5mm). Use UV shadowless adhesive to bond them together. The alignment accuracy is ≤0.1mm. Step S6.2: The tempered glass obtained in step S6.1 is cured using an LED surface light source with a curing energy of 500 mJ / cm². 2 After curing, the sheet resistance of the electrode is ≤50Ω / sq.

[0028] Step S7: Perform signal processing on the tempered glass obtained in step S6, specifically including the following steps: The tempered glass obtained in step S6.2 is used with an FT5336 touch IC to acquire signals via mutual capacitance scanning (sampling frequency 200Hz, 14-bit ADC). After low-pass filtering (3kHz) and PGA amplification (8x), the built-in DSP calculates the touch coordinates, which are then processed by I... 2 C interface output.

[0029] Step S8: For the tempered glass obtained in step S7, run the drive and calibrate the precision, specifically including the following: use the nine-point calibration method to adjust the linearity to ensure that the touch error is ≤1 mm; the final product passes the 100V / m electromagnetic interference test. Among them, the electromagnetic interference (EMI) testing standard is ISO 11452-2; Method: Place the sample in an electromagnetic field of 100V / m and check whether the touch function is normal, with no accidental touches or malfunctions.

[0030] Step S9: Apply insulating ink to the air surface of the tempered glass obtained in step S8.

[0031] Step S10: The tempered glass obtained in step S9 is cured to obtain the finished product.

[0032] In step S10, the curing process is carried out in stages, specifically including the following steps: Step S10.1: Pre-curing the insulating ink layer using a 365nm LED light source with an energy of 200mJ / cm². 2 Time: 15 seconds; Step S10.2: Main curing, using a 385nm LED light source with an energy of 400mJ / cm². 2 Time: 60 seconds; Step S10.3: Deep curing, using a high-pressure UV lamp with a composite spectrum and an energy of 800 mJ / cm². 2 Curing time is 90 seconds under nitrogen protection.

[0033] Verification requirements: The cured finished product must pass the following reliability tests: Cross-cut test (4B): According to ASTM D3359 standard, after making cross-cuts with a 1mm spacing, use 3M 600 tape to tear the cross-cut. The area of ​​ink loss should be ≤5%.

[0034] Withstand voltage test (DC 500V): Apply a 500V DC voltage between the ink layer and the sensor electrode for 60 seconds and measure the leakage current. The leakage current should be <2mA and there should be no breakdown.

[0035] High temperature and high humidity aging test: The finished product is placed in a constant temperature and humidity chamber at 85℃ and 85% relative humidity for 500 hours. After recovery, the appearance should be normal, the touch function should be intact, and the adhesion (100-cross test) and insulation should not be reduced.

[0036] Example 2 A capacitive touch tempered glass panel manufacturing process, which differs from Example 1 in the following steps: Step S1 uses an ultrasonic cleaner (frequency 40 kHz) with a neutral cleaning agent (pH 7.0±0.5) for 5 minutes.

[0037] In step S5.1, the precursor solution used is 0.25 mol / L ITO (In2O3:SnO2=90:10), the spraying speed is 7 cm / s, and the preheating temperature of the tempered glass substrate is 340℃.

[0038] Step S10, Pre-curing: LED energy 180mJ / cm 2 ; Main curing: LED energy 350mJ / cm 2 ; Deep curing: High-pressure UV lamp energy 750mj / cm 2 .

[0039] Everything else is the same as in Example 1, and will not be repeated here.

[0040] The capacitive touch tempered glass panel prepared in this embodiment needs to undergo the following key performance tests and meet the following indicators: Transmittance test: According to ASTM D1003 standard, the average optical transmittance of the finished product is measured in the wavelength range of 380-780nm using a UV-Vis spectrophotometer equipped with an integrating sphere. The requirement is ≥93.5%.

[0041] Sheet resistance test: According to ASTM F390 standard, a four-probe tester is used to measure the sheet resistance at multiple points on the coated surface of the finished product and the sensor area. The average value is required to be ≤45Ω / sq.

[0042] Touch response time test: Using a mechanical stylus and oscilloscope synchronous triggering method, measure the time delay from touch occurrence to coordinate data output, requiring an average value of <8ms.

[0043] After testing, the performance of the sample prepared in Example 2 of this invention met the above requirements.

[0044] Example 3 A capacitive touch tempered glass panel manufacturing process differs from Example 1 in that this example is designed for a large-size 1.5m × 0.8m automotive touchscreen, and the following adjustments are made: In step S5.1, the coating is applied using multiple nozzles simultaneously (nozzle spacing 20cm) to ensure the uniformity of the film thickness on the large-size substrate.

[0045] In step S10.3, the deep curing energy is increased by 10%, that is, an energy of 880 mJ / cm² is used. 2 High-pressure UV lamps are used for curing in a nitrogen atmosphere to compensate for heat loss at the edges of large panels and ensure uniform and thorough curing.

[0046] The other steps are the same as in Example 1.

[0047] The capacitive touch tempered glass panel prepared in this embodiment successfully passed the thermal shock test from -40℃ to 85℃ (1000 cycles without failure).

[0048] The thermal shock test process is as follows: Conditions: -40℃ ⇄ 85℃, maintain each temperature for 30 minutes, repeat 1000 times; Method: Use a thermal shock test chamber. After each cycle, check whether the function is normal and whether there is cracking or peeling.

[0049] Comparative Example 1 Unlike Example 1, this comparative example did not undergo the imprinting process in step S2, but was directly coated.

[0050] result: The finished film layer in this comparative example has poor adhesion (2B cross-cut adhesion test).

[0051] Touch signal noise test: The finished modules of this comparative example and Example 1 were placed in a shielded environment. The raw data of all sensing channels under static conditions were collected using touch IC debugging software, and their standard deviation was calculated as the noise value. The test results show that the noise level of this comparative example is 30% higher than that of Example 1.

[0052] analyze: The lack of imprinting process results in poor substrate surface flatness and chemical activity, which affects the uniformity and density of subsequent ITO coating, introduces significant capacitive noise, and thus deteriorates the touch signal-to-noise ratio.

[0053] Comparative Example 2 Unlike Example 1, step S10 of this comparative example uses a traditional single curing process: A single UV curing treatment was performed using a high-pressure mercury lamp with a curing energy of 600 mJ / cm². 2 .

[0054] Results: Due to the intense curing process and concentrated thermal stress, the cohesive stress of the insulating ink layer in this comparative example was too high, resulting in cracking and peeling after 200 hours of high temperature and high humidity testing.

[0055] Comparative Example 3 (Traditional magnetron sputtering process) Unlike Example 1, step S5.1 of this comparative example uses a traditional magnetron sputtering coating process, and the specific steps are as follows: Substrate loading: The cleaned glass substrate is loaded into the sputtering equipment chamber.

[0056] High vacuum: Evacuate the chamber background vacuum to ≤5.0×10⁻⁶. -4 Pa.

[0057] Pre-sputtering cleaning: Argon gas (40 sccm) is introduced to a working pressure of 0.5 Pa, and 3.5 kW DC power is applied to pre-sputter the ITO target (In2O3:SnO2=90:10) for 10 minutes.

[0058] Sputtering deposition: Sputtering deposition was performed for about 3 minutes in an atmosphere of argon (40 sccm) and oxygen (1.0 sccm) at a working pressure of 0.5 Pa, a substrate temperature of 300 °C, and a DC power of 3.5 kW.

[0059] Post-annealing: After deposition, the sample was annealed in air at 300°C for 60 minutes.

[0060] Results: The finished product produced in this comparative example had the following problems: Low transmittance (88%): Sputtered films have high density but may have defects and absorption, and the post-annealing process has limited optimization of optical performance.

[0061] High cost (approximately 50% increase): ITO targets are expensive, high vacuum equipment requires huge investment, energy consumption is high, and the process is complex and time-consuming.

[0062] Poor film thickness uniformity (±15% at the edge): On large-size substrates, the "racetrack" erosion effect of magnetron sputtering leads to uneven target utilization and uneven distribution of electric field and gas flow field, resulting in significant differences in film thickness between the edge and the center.

[0063] The finished products of Example 2 and Comparative Example 3 of the present invention were tested as follows, and the results are shown in Table 1.

[0064] 1. Light transmittance (%) standard: ASTM D1003 Methods: The average optical transmittance of the samples was measured in the wavelength range of 380–780 nm using a UV-Vis spectrophotometer equipped with an integrating sphere. The samples were placed under a standard D65 light source, and the average value was taken for three measurements.

[0065] 2. Shear resistance (Ω / sq) standard: ASTM F390 Method: Use a four-probe tester (such as the Keithley 2400 series) to measure at least 5 points on the coated surface and sensor area, and take the average value. The instrument must be calibrated before testing to ensure that the probe pressure is consistent.

[0066] 3. Touch response time (ms) Method: A synchronous triggering method using a mechanical stylus and a high-speed oscilloscope was employed. The stylus was applied to the screen with a fixed pressure (e.g., 50g), and the time delay from the touch event to the output of coordinate data by the touch IC was recorded. This was repeated 10 times, and the average value was taken.

[0067] 4. Adhesion standard after aging: ASTM D3359 (100-cross adhesion test) Method: Use a cross-cut scribing tool with a 1mm spacing to draw a 10×10 grid on the insulating ink layer. Apply 3M 600 tape and quickly peel it off, observing the area of ​​detachment. Rating standard: 0B–5B (5B is the best).

[0068] 5. Production Costs Method: Based on the actual production process, the costs of equipment investment, energy consumption, material loss, and labor were statistically analyzed and compared with Comparative Example 3 (traditional magnetron sputtering process) to calculate the percentage reduction in costs.

[0069] Table 1 Performance Test Results

[0070] "Benchmark" refers to a "reference point" or "baseline for comparison." In the table above, the benchmark refers to the production cost of Comparative Example 3 (i.e., the conventional magnetron sputtering process), with the cost of the conventional process set at 100% or 1 standard unit. The production cost of Embodiment 2 of the present invention is reduced by 30%, meaning that the cost of the process of the present invention is 70% of the cost of the conventional process.

[0071] Table 2 Analysis of Cost Reduction Sources

[0072] Based on Table 2 above, the conclusion that the production cost of Embodiment 2 of this invention is reduced by 30% is derived from a comparison of the unit costs of the spray pyrolysis method and the magnetron sputtering method. A cost model was established that includes parameters such as equipment depreciation, energy consumption, raw material unit price, maintenance costs, labor costs, production cycle time, and yield. The unit cost per square meter of qualified product was calculated and then calculated using the formula (magnetron sputtering cost - spray pyrolysis cost) / magnetron sputtering cost × 100%. This result stems from the comprehensive synergistic effect of five major factors: equipment, energy consumption, materials, maintenance, and yield. Among these, avoiding the use of high-vacuum equipment and ITO sputtering targets contributes the most significantly.

[0073] See Figure 2 and Figure 3 The images shown are the appearance renderings of the finished products obtained by the traditional process (Comparative Example 3) and the process of Example 2 of the present invention, respectively.

[0074] from Figure 2 and Figure 3 visible: 1. Comparison of surface optical properties Figure 2 In the middle, the finished product is presented: Poor light transmission uniformity: Due to limitations in the coating process (magnetron sputtering), there may be Newton's rings or rainbow patterns caused by uneven thickness (local color spots can be seen in the image).

[0075] High haze: Traditional glass surfaces have high roughness (Ra≥0.5 μm), resulting in significant light scattering. Figure 2 The overall appearance is slightly hazy, the surface reflection is relatively diffuse, and there is a noticeable halo phenomenon, indicating that the haze is high, which affects the visual clarity and light transmission uniformity. The light transmittance is usually ≤85%.

[0076] Figure 3 In the middle, the finished product is presented: High light transmittance: The present invention uses a spray pyrolysis coating method + staged curing process to make the surface of the finished product smoother and display a clearer visual effect (Ra≤0.1 μm, light transmittance≥92%).

[0077] No optical distortion: This invention optimizes refractive index matching through imprinting, eliminates Newton's rings, and no colored interference fringes are visible in the image.

[0078] 2. Detailed comparison of touch function areas Figure 2 In the middle, the finished product is presented: Sensor edge visibility: Traditional processes may cause glue to overflow from the sensor frame, as shown in the image with white glue marks at the edge.

[0079] The electrode pattern is rough: the etching precision is low (actual measurement under a microscope shows that the line width is ≥0.3 mm), the grid pattern is visible to the naked eye, and the serrated lines are faintly visible in the picture.

[0080] Figure 3 In the middle, the finished product is presented: Invisible electrode design: After UV curing, the sensor has the same refractive index as the glass, and there are no glue marks in the picture. The electrode line width is ≤0.2mm (invisible to the naked eye).

[0081] Touch area consistency: The coating + curing process used in this invention makes the touch area and the non-touch area visually indistinguishable, and the whole area in the picture appears as a uniform black.

[0082] 3. Comparison of durability performance Figure 2 In the middle, the finished product is presented: Surface scratches: The tempered glass is not hard enough, and fine scratches can be seen in the picture (scattered light spots under reflection).

[0083] Ink peeling: Insulating ink that has not been cured in stages is prone to cracking, as shown in the picture with fine cracks at the edges.

[0084] Figure 3 In the middle, the finished product is presented: Scratch resistance: After deep curing, the surface hardness of the finished product of this invention reaches 9H, and there is no scratch reflection interference in the figure.

[0085] Ink adhesion: The finished product of this invention undergoes staged curing, resulting in a tight bond between the ink and the substrate, with smooth edges and no cracks as shown in the figure.

[0086] 4. Comparison of process defect improvement Table 3 Comparison of process defect improvements between the examples and comparative examples

[0087] pass Figure 2 and Figure 3 The comparison shows that the present invention has the following beneficial effects: 1. Visual experience: High light transmittance, no distortion, and no electrode visibility, meeting the needs of high-end displays.

[0088] 2. Touch performance: Invisible sensor design + high-precision IC processing, supporting seamless interaction.

[0089] 3. Reliability: Hardened surface + staged curing, lifespan increased by about 3 times (accelerated aging test verification).

[0090] The accelerated aging test will be explained below.

[0091] 1. Purpose of the test The reliability of the capacitive touch panel produced by the process of the present invention (Example 2) after long-term use was verified, and compared with the traditional process (comparative example) to quantify the improvement in its lifespan.

[0092] 2. Testing Method: Accelerated Life Testing Principle: This method utilizes harsh environmental conditions (such as high temperature, high humidity, continuous operation, and thermal shock) to simulate and accelerate the aging process of products during daily use. According to the Arrhenius equation, the chemical reaction rate (i.e., the aging rate) approximately doubles for every 10°C increase in temperature. Therefore, testing at 85°C for one hour may be equivalent to using the product at room temperature (25°C) for hundreds or even thousands of hours.

[0093] Comparison Samples: Experimental group: Samples produced in Example 2 of this invention Control group: Samples produced by Comparative Example 3 (conventional magnetron sputtering process) 3. Test Items and Process (Comprehensive Test) A complete life assessment includes a series of accelerated tests as shown in Table 4 below. Failure of any one of these tests indicates that the sample has reached the end of its lifespan.

[0094] Table 4 Accelerated Aging Test Contents

[0095] Testing process: Initial testing: All samples must undergo functional, optical and electrical performance tests (such as light transmittance, sheet resistance, touch function, and cross-cut adhesion) before testing.

[0096] Group placement: The capacitive touch tempered glass panel sample prepared by the production process of Example 2 (experimental group) and the capacitive touch tempered glass panel sample prepared by the conventional magnetron sputtering process of Comparative Example 3 (control group) were placed into their respective aging test chambers.

[0097] Intermediate testing: At each testing interval, the sample was removed and allowed to recover at room temperature for at least 2 hours before undergoing all performance tests identical to the initial test. The testing intervals were set as follows: High temperature and high humidity aging test (85℃ / 85% RH), inspection interval: every 250 hours; High-temperature operating life test (85℃, continuous power-on), inspection interval: every 250 hours; Temperature cycling test (-40℃ ⇄ 85℃), check interval: every 250 cycles; Thermal shock test (-40℃ (5min) ⇄ 85℃ (5min)), check interval: every 100 cycles.

[0098] Failure determination: A system is considered "failed" if any of the following conditions are met: (1) Function failure: Touch control is completely unresponsive, and there is a large area of ​​touch blind spot.

[0099] (2) Performance degradation: Sheet resistance increases by more than 20%, and light transmittance decreases by more than 5%.

[0100] (4) Appearance deterioration: the insulating ink layer cracks, bubbles, and peels off (adhesion drops to 3B or below in cross-cut adhesion test).

[0101] (4) Electrical fault: leakage current exceeds the standard or breakdown occurs during withstand voltage test.

[0102] The test results are shown in Table 5 below.

[0103] Table 5 Accelerated aging test results

[0104] 4. Lifespan Comparison Analysis: In the high temperature and high humidity test (500 hours failure) in Comparative Example 3, which failed first, the durability time of Example 2 was 1500 / 500 = 3 times that of Comparative Example 3.

[0105] In other tests, the durability of Example 2 was close to or equal to 3 times (>2000 / 750≈2.67 times, >1500 / 500=3 times).

[0106] Based on all the tests, the conclusion was that "lifespan is increased by about 3 times".

[0107] The claim of "approximately 3 times improvement in lifespan" is a quantitative result derived from rigorous accelerated aging comparative testing and reliability engineering models. It comprehensively evaluates the product's durability in multiple aspects, including electrical, optical, mechanical, and chemical aspects, and is core evidence demonstrating the superior reliability of this invention.

[0108] 5. The significance of "3 times" lifespan in practical use Accelerated model conversion: According to the general reliability model, testing at 85℃ / 85%RH for 500 hours may be equivalent to using it for 3-5 years or even longer in a normal room temperature environment (25℃, 40-60%RH).

[0109] Conclusion: Therefore, this invention increases the reliable service life of the product from the theoretically estimated value (Comparative Example 3) of about 3 years to 10 years or even more, which greatly improves the quality and durability of the product and meets the needs of application scenarios with extremely high reliability requirements, such as automotive, industrial, and medical applications.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing process for a capacitive touch tempered glass panel, characterized in that, Includes the following steps: S1. Clean the tin surface of the tempered glass; S2. The cleaned tempered glass is subjected to an imprinting process, wherein an LED surface light source is used for curing during the imprinting process, and the energy of the LED surface light source is 300mj / cm². 2 -400mJ / cm 2 ; S3. Clean the air surface of the tempered glass after the embossing process; S4. Use an air gun to blow air to clean the surface of the tempered glass after cleaning; S5. A coating is applied to the cleaned tempered glass surface using a spray pyrolysis method, followed by annealing. The precursor solution used in the spray pyrolysis method is a tin-doped indium oxide solution with a concentration of 0.1 mol / L-0.3 mol / L. The spraying distance is 20 cm-30 cm, the spraying pressure is 0.2 MPa-0.5 MPa, and the preheating temperature of the tempered glass is 300℃-350℃. The annealing process is carried out in an air or nitrogen atmosphere, with an annealing temperature of 230℃-350℃ and an annealing time of 30min-60min. S6. Fix the projected capacitive sensor onto the coated surface of the tempered glass, bond it using UV-curing adhesive, and cure it using an LED surface light source. The electrode linewidth of the projected capacitive sensor is ≤0.2mm, the bonding alignment accuracy is ≤0.1mm, and the curing temperature is 450mj / cm². 2 -550mj / cm 2 The LED surface light source is cured; S7. Use a touch IC to process sensor signals; S8. Run the driver and perform accuracy calibration; S9. Use insulating ink for spray coating; S10. Curing the insulating ink layer to obtain the finished product; In step S10, the curing process is carried out in stages, including pre-curing, main curing, and deep curing under nitrogen protection, specifically as follows: Using an energy of 150 mJ / cm 2 -250mj / cm 2 The 365nm LED light source is pre-cured; Using an energy of 350 mJ / cm 2 -450mJ / cm 2 The 385nm LED light source is used for main curing; The energy used is 750 mJ / cm 2 -880mj / cm 2 The high-pressure UV lamp performs deep curing under a nitrogen atmosphere.

2. The manufacturing process for capacitive touch tempered glass panels according to claim 1, characterized in that, In step S4, an air gun with a pressure ≤0.5MPa is used for air blowing cleaning.

3. The manufacturing process for a capacitive touch tempered glass panel according to claim 1, characterized in that, In step S8, the accuracy calibration adopts the nine-point calibration method, and the touch linearity error after calibration is ≤1mm.

4. A capacitive touch tempered glass panel, characterized in that, It is manufactured using the capacitive touch tempered glass panel manufacturing process described in any one of claims 1-3.

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