Touch display module and assembling method thereof

Abstract

The application discloses a touch display module and an assembling method thereof. The disclosed touch display module comprises a metal face frame layer, a touch module layer, a first optical adhesive layer, an electromagnetic shielding layer, a second optical adhesive layer, a display module layer and a metal back shell layer arranged in sequence from top to bottom. The area of the touch module layer is the same as that of the display module layer, the area of the electromagnetic shielding layer is larger than that of the touch module layer, and the edge joint area of the electromagnetic shielding layer beyond the touch module layer is connected with the metal face frame layer. The application provides a touch display module and an assembling method thereof, which can prevent electromagnetic radiation leakage of the touch display module, increase the light transmittance of the touch display module, improve the electromagnetic shielding and display effect of the touch display module, and thus improve the safety of the touch display module in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of touch display screen, in particular to a touch display module and an assembling method thereof. BACKGROUND

[0002] The electromagnetic shielding method of the existing touch display module is to add a layer of ITO (Indium-Tin Oxide) transparent conductive glass or film as a shielding layer between the touch screen and the display module. However, since the electromagnetic shielding layer is not in contact with the metal shell of the whole machine in this structure, it cannot form a closed and complete shielding continuum, resulting in electromagnetic radiation leakage from the gap between the shielding layer and the metal shell, thereby affecting the electromagnetic compatibility of the whole machine. An ideal electromagnetic shield must be a complete and continuous conductor, but in reality, there are many gaps (gaps between different parts of the shielding body) in the assembly of the whole machine, and the longer the gap, the worse the shielding effect, and the easier the electromagnetic radiation leakage.

[0003] In addition, the shielding layer is attached to the touch module and the display module using a frame, resulting in an air gap of 1-2 mm between the shielding layer and the display module and the touch module. The refractive index of air medium is 1.0, which is quite different from the refractive index of glass (1.5), causing multiple reflections when light passes through, reducing the light transmittance, and due to the viewing angle, there is a reflection phenomenon, affecting the display effect.

[0004] Therefore, how to prevent electromagnetic radiation leakage of the touch display module and increase the light transmittance of the touch display module to improve the electromagnetic shielding and display effect of the touch display module and thereby improve the safety of the touch display module in use scenarios is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a touch display module and an assembling method thereof to prevent electromagnetic radiation leakage of the touch display module and increase the light transmittance of the touch display module, improve the electromagnetic shielding and display effect of the touch display module, and thereby improve the safety of the touch display module in use scenarios.

[0006] The touch display module provided by the present application comprises a metal face frame layer, a touch module layer, a first optical adhesive layer, an electromagnetic shielding layer, a second optical adhesive layer, a display module layer and a metal back shell layer arranged from top to bottom.

[0007] Preferably, the electromagnetic shielding layer includes a transparent viewing area and an edge overlap area, the area of ​​the transparent viewing area is the same as the area of ​​the touch module layer, and the edge overlap area is arranged around the transparent viewing area;

[0008] A transparent conductive film with electromagnetic shielding function is grown on a substrate with a transparent visible area. The transparent conductive film has an irregularly shaped metal grid, and the edge overlap area is an opaque conductive film.

[0009] Preferably, the edge overlap area can be directly overlapped with the metal frame layer; the edge overlap area can also be indirectly overlapped with the metal frame layer through a conductive material.

[0010] Preferably, the metal face frame layer and the metal back shell layer are secured with fasteners after a conductive rubber strip is placed between them.

[0011] Preferably, a power supply voltage output control device is provided on the metal back shell layer. The power supply voltage output control device includes a voltage control module, which includes a voltage processing module, a PWM module, a voltage conversion module, and a feedback module. An external power supply module provides power to the touch module layer and the display module layer through the voltage control module.

[0012] The external power supply module provides power to the touch module layer and display module layer through the voltage processing module, PWM module, and voltage conversion module. The feedback module detects the voltage value, load loading status, and / or operating frequency at the output of the voltage conversion module in real time and sends the detection information to the voltage processing module. The voltage processing module generates a target voltage value based on the load loading status and / or operating frequency according to preset rules, and generates a parallel voltage identification code based on the target voltage value and the detected voltage value, which is then sent to the PWM module. The PWM module adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. The voltage conversion module adjusts the output voltage amplitude according to the duty cycle of the PWM signal.

[0013] Preferably, the voltage control module further includes a switching module, and the voltage processing module, PWM module, voltage conversion module and switching module are connected in sequence; when the input current of the external power supply module exceeds the current preset range, the voltage processing module sends a control signal to the switching module through the PWM module and voltage conversion module, and the switching module is disconnected.

[0014] Preferably, the power supply voltage output control device further includes a transient pulse anti-interference module, which is connected to the voltage control module and the power supply module respectively; the transient pulse anti-interference module is used to suppress transient pulse interference of the voltage output by the power supply module, and output voltage to the voltage control module after surge protection processing.

[0015] Preferably, the transient pulse anti-interference module includes a first-level voltage limiting module, an isolation module, and a second-level voltage limiting module, wherein:

[0016] When the power module output voltage is normal, the power module outputs voltage through the first-stage voltage limiting module, the isolation module, and the second-stage voltage limiting module.

[0017] When the output voltage of the power module exceeds the predetermined amplitude range, the first-stage voltage limiting module responds in time to discharge the surge energy and limit the output voltage to the predetermined amplitude range, and outputs the voltage through the isolation module and the second-stage voltage limiting module.

[0018] When the output voltage of the power module exceeds the predetermined amplitude range, the first-stage voltage limiting module does not respond in time. The isolation module increases its internal resistance to reduce the voltage and outputs it to the second-stage voltage limiting module. The second-stage voltage limiting module discharges the surge energy and limits the output voltage to the predetermined amplitude range before outputting the voltage.

[0019] Preferably, the power supply voltage output control device further includes an EMI anti-interference module, which is connected to the transient pulse anti-interference module and the voltage control module respectively, and is used to output the voltage processed by the transient pulse anti-interference module to the voltage control module after EMI anti-interference processing.

[0020] The EMI anti-interference module includes a high-frequency noise processing module and a filtering module, wherein:

[0021] When the input voltage to the high-frequency noise processing module is normal, the high-frequency noise processing module outputs voltage through the filtering module;

[0022] When the voltage input to the high-frequency noise processing module is subject to high-frequency electromagnetic interference, the high-frequency noise processing module absorbs the high-frequency signal, and the filtering module performs filtering and decoupling processing on the high-frequency electromagnetic signal before outputting the voltage.

[0023] The present invention also provides a method for assembling a touch display module, the method comprising the following steps:

[0024] S1: A transparent conductive metal film is grown on the substrate of the transparent visible area of ​​the electromagnetic shielding layer;

[0025] S2: Using exposure, development, and etching processes, a transparent visible area with an irregularly shaped metal mesh and an opaque edge overlap area surrounding the transparent visible area are formed on a conductive metal thin film;

[0026] S3: A layer of OCA adhesive film is fully laminated onto the surface of the touch module layer to form the first optical adhesive layer;

[0027] S4: Remove the protective release film from the surface of the first optical adhesive layer and fully bond the upper surface of the electromagnetic shielding layer to the lower surface of the touch module layer;

[0028] S5: A layer of solid OCA adhesive film is fully bonded to the lower surface of the electromagnetic shielding layer to form a second optical adhesive layer;

[0029] S6: Remove the protective release film from the surface of the second optical adhesive layer, and then fully bond the upper surface of the display module layer with the lower surface of the electromagnetic shielding layer and the touch layer;

[0030] S7: Install the bonded touch module layer, first optical adhesive layer, electromagnetic shielding layer, second optical adhesive layer, and display module layer on the lower surface of the metal frame layer, and overlap the edge of the metal frame layer with the edge overlap area of ​​the electromagnetic shielding layer.

[0031] S8: Conductively connect the metal back shell layer and the metal front frame layer, and fasten them with fasteners.

[0032] The present invention provides a touch display module and its assembly method, which prevents electromagnetic radiation leakage of the touch display module and increases the light transmittance of the touch display module, improves the electromagnetic shielding and display effect of the touch display module, thereby improving the safety of the touch display module in the application scenarios. Attached Figure Description

[0033] Figure 1 A cross-sectional view of the front view of a touch display module provided by the present invention;

[0034] Figure 2 This invention provides a structural disassembly diagram of a touch display module;

[0035] Figure 3 A plan view of the electromagnetic shielding layer of a touch display module provided by the present invention;

[0036] Figure 4 An assembly diagram of a touch display module provided by the present invention;

[0037] Figure 5 Structural block diagram of the first power supply voltage output control device for a touch display module provided by the present invention;

[0038] Figure 6 A structural block diagram of the power supply voltage output control device for the second type of touch display module provided by the present invention;

[0039] Figure 7 Structural block diagram of the third type of power supply voltage output control device for touch display module provided by the present invention;

[0040] Figure 8 A flowchart of an assembly method for a touch display module provided by the present invention. Detailed Implementation

[0041] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0042] It should be noted that, for ease of description, "upper" and "lower" in this embodiment are relative to... Figure 1 In this invention, unless otherwise specified, the direction towards the metal back shell layer is downward, and the direction towards the metal front frame layer is upward. "And / or" means that both can be simultaneously present, or one of them can be selected, such as scheme A and / or scheme B, including the three cases of scheme A, scheme B, and scheme A and scheme B.

[0043] See Figure 1 and 2 , Figure 1 This is a cross-sectional view of the front view of a touch display module provided by the present invention. Figure 2 This is a structural disassembly diagram of a touch display module provided by the present invention.

[0044] A touch display module includes, from top to bottom, a metal frame layer 1, a touch module layer 2, a first optical adhesive layer 3, an electromagnetic shielding layer 4, a second optical adhesive layer 5, a display module layer 6, and a metal back shell layer 7; wherein, the area of ​​the touch module layer 2 is the same as the area of ​​the display module layer 6, the area of ​​the electromagnetic shielding layer 4 is larger than the area of ​​the touch module layer 6, and the edge overlap area of ​​the electromagnetic shielding layer 4 extending beyond the touch module layer 6 is connected to the metal frame layer 1.

[0045] This invention provides a touch display module in which the area of ​​the electromagnetic shielding layer is larger than the area of ​​the touch module layer. The edge of the electromagnetic shielding layer that extends beyond the touch module layer is connected to the metal frame layer to form a closed and continuous electromagnetic shield. This prevents electromagnetic radiation leakage from the touch display module and increases the light transmittance of the touch display module, thereby improving the electromagnetic shielding and display effect of the touch display module and enhancing the safety of the touch display module in various usage scenarios.

[0046] See Figure 3 , Figure 3 A plan view of the electromagnetic shielding layer of a touch display module provided by the present invention.

[0047] The electromagnetic shielding layer of the touch display module includes a transparent viewing area 41 and an edge transition area 42. The area of ​​the transparent viewing area 41 is the same as the area of ​​the touch module layer 6, and the edge transition area 42 is arranged around the transparent viewing area 41.

[0048] A transparent conductive film with electromagnetic shielding function is grown on the substrate of the transparent visible area 41. The transparent conductive film has an irregularly shaped metal mesh, and the edge overlap area 42 is an opaque conductive film. The substrate of the transparent visible area 21 is transparent glass, PMMA (polymethyl methacrylate), or PET (polyethylene terephthalate) film.

[0049] Furthermore, the edge overlap area 42 can be directly overlapped with the metal frame layer 1; the edge overlap area 42 can also be indirectly overlapped with the metal frame layer 1 through a conductive material. The conductive material can be conductive cloth, etc. The width of the edge overlap area 42 is 4-6 mm.

[0050] Preferably, the electromagnetic shielding layer of the touch display module has a light transmittance of over 80%, a sheet resistance of <5Ω / □, and an average electromagnetic shielding effectiveness of >50dB at different frequencies, thereby further preventing electromagnetic radiation leakage from the touch display module and increasing the light transmittance of the touch display module.

[0051] Figure 4 , Figure 4 This is an assembly diagram of a touch display module provided by the present invention.

[0052] In a further embodiment, a conductive rubber strip is placed between the metal frame layer 1 and the metal back shell layer 7, and then fastened with fasteners to prevent electromagnetic radiation leakage from the touch display module.

[0053] The first optical adhesive layer 3 and the second optical adhesive layer 5 are acrylate or silicone pressure-sensitive adhesives, which have good adhesion and a refractive index of 1.41 to 1.54, close to the refractive index of glass of 1.5.

[0054] See Figure 5 , Figure 5 Structural block diagram of the first power supply voltage output control device for a touch display module provided by the present invention;

[0055] A power supply voltage output control device is provided on the metal back shell layer 7. The power supply voltage output control device includes a voltage control module 400, which includes a voltage processing module 401, a PWM (Pulse Width Modulation) module 402, a voltage conversion module 403, and a feedback module 404. The external power supply module 100 provides power to the touch module layer 2 and the display module layer 6 through the voltage control module 400.

[0056] The external power supply module 100 provides power to the touch module layer 2 and the display module layer 6 through the voltage processing module 401, the PWM module 402, and the voltage conversion module 403. The feedback module 404 detects the voltage value, load loading status, and / or operating frequency at the output of the voltage conversion module 403 in real time and sends the detection information to the voltage processing module 404. The voltage processing module 401 generates a target voltage value based on the load loading status and / or operating frequency according to a preset rule, and generates a parallel voltage identification code based on the target voltage value and the detected voltage value, which is then sent to the PWM module 402. The PWM module 402 adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. The voltage conversion module 403 adjusts the output voltage amplitude according to the duty cycle of the PWM signal.

[0057] When the power module input is normal, the voltage conversion module provides power to the touch module layer 2 and the display module layer 6. The feedback module monitors the voltage value, load conditions, and / or operating frequency at the output of the voltage conversion module in real time and sends the detection information to the voltage processing module. The voltage processing module generates a target voltage value based on the load conditions and / or operating frequency according to preset rules, and generates a parallel voltage identification code based on the target voltage value and the detected voltage value, which is then sent to the PWM module. The PWM module adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. The voltage conversion module adjusts the output voltage amplitude according to the duty cycle of the PWM signal. By adjusting the energy storage power supply to provide a high-precision output voltage, excessive output voltage can be prevented from burning out the touch module layer and the display module layer, thus ensuring the safety of the touch display module usage scenario.

[0058] The voltage processing module generates a target voltage value by looking up a preset control table based on the load and / or operating frequency. It then generates a parallel voltage identification code based on the target voltage value and the detected voltage value and sends it to the PVID (Parallel Voltage Identification) interface of the PWM module through the GPIO (General Purpose Input Output) interface.

[0059] The preset control table can be set manually based on experience, or it can be learned through algorithms based on the voltage value at the output of the voltage conversion module, the load condition, and / or the operating frequency.

[0060] Furthermore, the voltage control module 400 also includes a switching module 405. The voltage processing module 401, PWM module 402, voltage conversion module 403, and switching module 405 are connected in sequence. When the input current of the external power supply module 100 exceeds the preset current range, the voltage processing module 401 sends a control signal to the switching module 405 through the PWM module 402 and voltage conversion module 403, and the switching module 405 disconnects. When the input current of the external power supply module 100 exceeds the preset current range, i.e., a short circuit occurs, the voltage processing module 401 sends a control signal to the switching module 405, and the switching module disconnects the line connection, realizing short-circuit protection of the output voltage and ensuring that the touch display module is not damaged.

[0061] See Figure 6 , Figure 6 The structural block diagram of the power supply voltage output control device for the second type of touch display module provided by the present invention.

[0062] The second implementation differs from the first in that the power supply voltage output control device includes a voltage control module and a transient pulse anti-interference module 200. The transient pulse anti-interference module 200 is connected to both the voltage control module 400 and the power supply module 100. The transient pulse anti-interference module 200 suppresses transient pulse interference from the voltage output by the power supply module 100 and performs surge protection before outputting the voltage to the voltage control module 400. Setting up a transient pulse anti-interference module before the voltage control module enhances the suppression of transient pulse interference, thereby improving the stability of the output voltage.

[0063] Furthermore, the transient pulse anti-interference module 200 includes a first-stage voltage limiting module 201, an isolation module 202, and a second-stage voltage limiting module 203. When the power module 100 outputs a normal voltage, the power module 100 outputs voltage through the first-stage voltage limiting module 201, the isolation module 202, and the second-stage voltage limiting module 203. When the power module 100 outputs voltage beyond a predetermined amplitude range, the first-stage voltage limiting module 201 responds promptly to dissipate surge energy and limit the output voltage to the predetermined amplitude range, then outputs voltage through the isolation module 202 and the second-stage voltage limiting module 203. When the power module outputs voltage beyond the predetermined amplitude range, the first-stage voltage limiting module 201 fails to respond promptly, and the isolation module 202 increases its internal resistance to reduce the voltage before outputting it to the second-stage voltage limiting module 203. The second-stage voltage limiting module 203 dissipates surge energy and limits the output voltage to the predetermined amplitude range before outputting voltage.

[0064] When the power module 100 outputs a normal voltage, it outputs voltage to the voltage processing module 401 of the voltage control module 400 through the first-stage voltage limiting module 201, the isolation module 202, and the second-stage voltage limiting module 203. Power is then supplied to the touch module layer 2 and the display module layer 6 via the voltage processing module 401, the PWM module 402, and the voltage conversion module 403. The feedback module 404 monitors the voltage value, load conditions, and / or operating frequency at the output of the voltage conversion module 403 in real time and sends the monitoring information to the voltage processing module 404. The voltage processing module 401 generates a target voltage value based on the load conditions and / or operating frequency according to preset rules, and generates a parallel voltage identification code based on the target voltage value and the detected voltage value, sending it to the PWM module 402. The PWM module 402 adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. The voltage conversion module 403 adjusts the output voltage amplitude according to the duty cycle of the PWM signal.

[0065] When the output voltage of the power module 100 exceeds a predetermined amplitude range, the first-stage voltage limiting module 201 responds promptly to discharge the surge energy and limit the output voltage to the predetermined amplitude range. The voltage is then supplied to the voltage processing module 401 of the voltage control module 400 via the isolation module 202 and the second-stage voltage limiting module 203. The first-stage voltage limiting module 201 provides front-end protection by dissipating large surge energy, while the second-stage voltage limiting module 203 provides final-stage fine protection to further release surge energy.

[0066] Furthermore, when the power module output voltage exceeds the predetermined amplitude range, if the first-stage voltage limiting module 201 fails to respond in time, the isolation module 202 increases its internal resistance to reduce the voltage before outputting it to the second-stage voltage limiting module 203. The second-stage voltage limiting module 203 then discharges the surge energy and limits the output voltage to the predetermined amplitude range before outputting the voltage to the voltage processing module 401 of the voltage control module 400. If the first-stage voltage limiting module 201 fails to respond in time to discharge the large surge energy, the isolation module 202 increases its internal resistance to reduce the voltage before outputting it to the second-stage voltage limiting module 203, preventing damage to the second-stage voltage limiting module 203 due to the first-stage voltage limiting module 201's failure to respond in time. This ensures that the second-stage voltage limiting module 203 discharges the surge energy and limits the output voltage to the predetermined amplitude range before outputting the voltage to the voltage processing module 401 of the voltage control module 400.

[0067] The first-level voltage limiting module 201, the isolation module 202, and the second-level voltage limiting module 203 provide effective protection against transient pulse interference and surges, thereby providing a stable voltage output for subsequent voltage control modules and electronic equipment.

[0068] Preferably, the first-stage voltage limiting module 201 can be a varistor, the isolation module 202 can be a resettable fuse, an inductor, or a resistor, and the second-stage voltage limiting module 203 can be a transient diode.

[0069] The transient pulse anti-interference module 400 includes a varistor, a resettable fuse, and a transient diode. When the power module 100 outputs a normal voltage, the power module 100 supplies power to the voltage processing module 401 of the voltage control module 400 through the varistor, resettable fuse, and transient diode. When the output voltage of the power module 100 exceeds a predetermined amplitude range, the varistor responds promptly to dissipate surge energy and limit the output voltage within the predetermined amplitude range, supplying power to the voltage processing module 401 of the voltage control module 400 through the resettable fuse and transient diode. When the output voltage of the power module 100 exceeds the predetermined amplitude range, the varistor does not respond promptly; the resettable fuse increases its internal resistance to reduce the voltage and outputs it to the transient diode. The transient diode dissipates surge energy and limits the output voltage within the predetermined amplitude range, supplying power to the voltage processing module 401 of the voltage control module 400.

[0070] When the power supply of the input touch display module is poor and the voltage is unstable, these protection devices need to be used in good coordination. However, these protection devices cannot be simply connected in parallel to achieve graded protection. If a varistor and a transient diode with significantly different current ratings are connected in parallel, the transient diode is often found to be damaged after a lightning surge test, failing to take advantage of the varistor's larger current capacity. The reason for this is that the transient diode conducts much faster than the varistor, so the varistor cannot respond in time and the transient diode is already damaged under the large current surge. Therefore, a self-resetting fuse is added between the varistor and the transient diode to suppress instantaneous current changes. When a large current surge occurs, the internal resistance of the self-resetting fuse increases, preventing the overcurrent on the transient diode from exceeding its maximum current capacity. Furthermore, the resistance of the self-resetting fuse is very small under normal conditions and will not affect the normal operation of the system.

[0071] Varistors offer strong surge protection and high peak current withstand capability. When the voltage across them exceeds a certain value, the resistance decreases, thus dissipating surge energy and limiting the surge voltage amplitude within a certain range. Transient diodes in the circuit have the advantages of short response time and low clamping voltage. When the voltage across a transient diode exceeds a certain value, the device quickly conducts, dissipating surge energy and limiting the surge voltage amplitude within a certain range. When the external power supply is unstable, combining varistors, resettable fuses, and transient diodes leverages their individual characteristics. The sequential arrangement of these components maximizes their advantages and prevents damage to other devices.

[0072] See Figure 7 , Figure 7 The structural block diagram of the power supply voltage output control device for the third type of touch display module provided by the present invention.

[0073] The third implementation differs from the second in that the power supply voltage output control device further includes an EMI (Electromagnetic Interference) suppression module 300. This EMI suppression module 300 is connected to both the transient pulse suppression module 200 and the voltage control module 400, and is used to process the voltage processed by the transient pulse suppression module 200 through EMI suppression before outputting the voltage to the voltage control module 300. By placing the EMI suppression module 300 between the transient pulse suppression module 200 and the voltage control module 400, power supply EMI interference is suppressed, thereby further improving the stability of the system output voltage.

[0074] Furthermore, the EMI anti-interference module 300 includes a high-frequency noise processing module 301 and a filtering module 302, wherein: when the external power supply module 100 outputs a normal voltage, the power supply module 100 outputs a voltage to the voltage processing module 401 of the voltage control module 400 through the first-stage voltage limiting module 201, the isolation module 202, the second-stage voltage limiting module 203, the high-frequency noise processing module 301, and the filtering module 302. The electronic device 500 is powered by a voltage processing module 401, a PWM module 402, and a voltage conversion module 403. The feedback module 404 detects the voltage value, load conditions, and / or operating frequency at the output of the voltage conversion module 403 in real time and sends the detection information to the voltage processing module 404. The voltage processing module 401 generates a target voltage value based on the load conditions and / or operating frequency according to preset rules, and generates a parallel voltage identification code based on the target voltage value and the detected voltage value, which is then sent to the PWM module 402. The PWM module 402 adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. The voltage conversion module 403 adjusts the output voltage amplitude according to the duty cycle of the PWM signal.

[0075] When the output voltage of the second-stage voltage limiting module 203 is subject to high-frequency electromagnetic interference, the high-frequency noise processing module 301 absorbs the high-frequency signal, and the filtering module 302 performs filtering and decoupling processing on the high-frequency electromagnetic signal before outputting the voltage. This voltage is supplied to the voltage processing module 401 of the voltage control module 400.

[0076] The high-frequency noise processing module 301 and the filtering module 302 effectively suppress high-frequency electromagnetic interference, thereby providing a stable voltage output for subsequent applications.

[0077] Preferably, the high-frequency noise processing module 301 can be a ferrite bead, and the filtering module 302 can be a capacitor bank.

[0078] The EMI anti-interference module includes a ferrite bead and a capacitor bank. When the power module output voltage is normal, the power module outputs voltage through a varistor, a resettable fuse, a transient diode, a ferrite bead, and a capacitor bank. When there is high-frequency electromagnetic interference in the output voltage of the transient diode, the ferrite bead absorbs the high-frequency signal, and the capacitor bank filters and decouples the high-frequency electromagnetic signal before outputting the voltage.

[0079] Ferrite beads and capacitor banks effectively suppress high-frequency interference on power lines. The EMI suppression module is placed after the transient pulse suppression module and is unaffected by large currents.

[0080] The voltage control module is preceded by a transient pulse anti-interference module and an EMI anti-interference module. These modules combine the characteristics of the components in the circuit and are arranged in a specific order to maximize the advantages of each component and prevent damage. The use of small and low-cost components solves the problem of limited space in the transmitter, saving space. The system can suppress various interferences in the transmitter power supply, ensuring a clean power supply and safe operation of the touch display module in harsh working environments.

[0081] See Figure 8 , Figure 8 The present invention provides a flowchart of a first method for assembling a touch display module.

[0082] A method for assembling a touch display module, the method comprising the following steps:

[0083] S1: A transparent conductive metal film is grown on the substrate of the transparent visible area of ​​the electromagnetic shielding layer; the growth method is by low-temperature DC sputtering or magnetron sputtering.

[0084] S2: An exposure, development, and etching process is used to form a transparent visible area with an irregularly shaped metal mesh and an opaque edge boundary area surrounding the transparent visible area on a conductive metal thin film. A transparent metal mesh area is fabricated in the central region of the conductive metal thin film using photomask technology and photolithography, while the edge regions retain the metal thin film as opaque edge boundary areas. The wire diameter of the metal mesh lines in the metal mesh area is 5–10 μm, and the mesh size is ≥190 mesh.

[0085] S3: A layer of OCA (Optically Clear Adhesive) film is fully laminated onto the surface of the touch module layer to form the first optical adhesive layer; the full lamination of the OCA film onto the surface of the touch module layer is specifically accomplished by a wire mesh flipping machine with CCD (Charge-coupled Device) or tooling fixture mechanical positioning function, which is soft to hard.

[0086] S4: Remove the protective release film from the surface of the first optical adhesive layer, and fully bond the upper surface of the electromagnetic shielding layer to the lower surface of the touch module layer; the full bonding of the upper surface of the electromagnetic shielding layer and the lower surface of the touch module layer is specifically achieved by first pre-bonding using a tooling fixture, and then completing the hard-to-hard bonding in a vacuum full bonding equipment. The optical adhesive can completely fill the air gap between the electromagnetic shielding layer and the touch module layer to form a full bond, improving the airtightness and display effect of the entire structure.

[0087] S5: A solid OCA adhesive film is fully laminated onto the lower surface of the electromagnetic shielding layer to form a second optical adhesive layer; the full lamination method is to complete the soft-to-hard lamination using a mesh cage flipping machine with CCD or tooling fixture mechanical positioning function.

[0088] S6: Remove the protective release film from the surface of the second optical adhesive layer, and then fully bond the upper surface of the display module layer with the lower surface of the electromagnetic shielding layer and the touch layer; specifically, the full bonding of the upper surface of the display module layer with the lower surface of the electromagnetic shielding layer and the touch layer is first pre-bonded using a tooling fixture, and then hard-to-hard bonding is completed in a vacuum full bonding equipment. The optical adhesive can completely fill the air gaps between the display module layer, the electromagnetic shielding layer, and the touch module layer to form a full bond, improving the airtightness and display effect of the entire structure.

[0089] S7: Install the bonded touch module layer, first optical adhesive layer, electromagnetic shielding layer, second optical adhesive layer, and display module layer on the lower surface of the metal frame layer, and overlap the edge of the metal frame layer with the opaque edge of the electromagnetic shielding layer; specifically, the overlap of the edge of the metal frame layer with the opaque edge of the electromagnetic shielding layer is achieved by first uniformly applying conductive adhesive to the opaque conductive overlap area of ​​the electromagnetic shielding layer, and then completing the bonding and curing of the conductive adhesive under low temperature heating conditions, or by using a conductive material such as a flexible conductive tape with adhesive and conductivity to bond the opaque overlap area of ​​the edge of the electromagnetic shielding layer to the side edge of the metal frame layer, so that the electromagnetic shielding layer and the metal frame layer form an effective electrical overlap.

[0090] S8: Conductively connect the metal back shell layer and the metal front frame layer, and secure them with fasteners. Place a conductive rubber strip between the metal back shell layer and the metal front frame layer, and then secure them with fastener screws. The metal back shell layer, the metal front frame layer, and the electromagnetic shielding layer directly form a complete, continuous, and effective shield.

[0091] This invention provides a method for assembling a touch display module. The area of ​​the electromagnetic shielding layer is larger than the area of ​​the touch module layer. The edge of the electromagnetic shielding layer that extends beyond the touch module layer is connected to the metal frame layer to form a closed and continuous electromagnetic shield. This prevents electromagnetic radiation leakage from the touch display module and increases the light transmittance of the touch display module, improving the electromagnetic shielding and display effect of the touch display module, thereby enhancing the safety of the touch display module in various usage scenarios.

[0092] The present invention provides a detailed description of a touch display module and its assembly method. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1.A touch display module, characterized in that, The display module layer, the metal back shell layer, the electromagnetic shielding layer, the second optical adhesive layer, the metal face frame layer and the touch module layer are sequentially arranged from top to bottom. The electromagnetic shielding layer comprises a transparent visual area and an edge abutting area, the area of the transparent visual area is the same as that of the touch module layer, and the edge abutting area is arranged around the transparent visual area. The transparent visual area is provided with a transparent conductive film having an electromagnetic shielding function, and the edge abutting area is provided with an opaque conductive film. 2.The touch display module of claim 1, wherein, The edge abutting area can be directly connected to the metal face frame layer, or indirectly connected to the metal face frame layer through a conductive material. 3.The touch display module of claim 2, wherein, The metal face frame layer and the metal back shell layer are connected through a fastener after being padded with a conductive rubber strip. 4.The touch display module of claim 3, wherein, The metal back shell layer is provided with a power voltage output control device, which comprises a voltage control module, the voltage control module comprises a voltage processing module, a PWM module, a voltage conversion module and a feedback module. The voltage processing module generates a target voltage value according to the load loading condition and / or the working frequency condition according to a preset rule, and generates a parallel voltage identification code according to the target voltage value and the detected voltage value and sends the parallel voltage identification code to the PWM module. The PWM module adjusts the duty cycle of the output PWM signal according to the parallel voltage identification code. 5.The touch display module of claim 4, wherein, The voltage conversion module adjusts the voltage amplitude of the output according to the duty cycle of the PWM signal. 6.The touch display module of claim 5, wherein, The voltage control module further comprises a switching module, and the voltage processing module, the PWM module, the voltage conversion module and the switching module are connected in sequence. 7.The touch display module of claim 6, wherein, When the input current of the external power supply module exceeds the preset current range, the voltage processing module sends a control signal to the switching module through the PWM module and the voltage conversion module, and the switching module is disconnected. The power voltage output control device further comprises a transient pulse anti-interference module, which is connected with the voltage control module and the power supply module. The transient pulse anti-interference module is used to suppress the voltage output by the power supply module from transient pulse interference, and output the voltage after surge protection processing to the voltage control module. The transient pulse anti-interference module comprises a first-stage voltage limiting module, an isolation module and a second-stage voltage limiting module. When the output voltage of the power module exceeds the predetermined amplitude range, the first voltage limiting module timely responds to discharge the surge energy and limit the output voltage in the predetermined amplitude range, and outputs the voltage through the isolation module and the second voltage limiting module; When the output voltage of the power module exceeds the predetermined amplitude range, the first voltage limiting module does not timely respond, the isolation module increases the internal resistance to reduce the voltage and then outputs the voltage to the second voltage limiting module, and the second voltage limiting module discharges the surge energy, limits the output voltage in the predetermined amplitude range, and then outputs the voltage. 8.The touch display module of claim 7, wherein, The power voltage output control device further comprises an EMI anti-interference module connected with the transient pulse anti-interference module and the voltage control module, for performing EMI anti-interference processing on the voltage processed by the transient pulse anti-interference module and then outputting the voltage to the voltage control module; The EMI anti-interference module comprises a high-frequency noise processing module and a filter module, wherein: When the voltage input into the high-frequency noise processing module is normal, the high-frequency noise processing module outputs the voltage through the filter module; When the voltage input into the high-frequency noise processing module has high-frequency electromagnetic interference, the high-frequency noise processing module absorbs the high-frequency signal, and the filter module filters and decouples the high-frequency electromagnetic signal and then outputs the voltage. 9.A method for assembling a touch display module, the method comprising: The method comprises the following steps: S1: growing a transparent conductive metal film on the substrate of the transparent visual area of the electromagnetic shielding layer; S2: forming a transparent visual area provided with a metal mesh of irregular shape and an opaque edge abutting area surrounding the transparent visual area on the conductive metal film by using an exposure, development and etching process; S3: fully bonding a 0CA adhesive film on the surface of the touch module layer to form a first optical adhesive layer; S4: removing the protective release film on the surface of the first optical adhesive layer, and fully bonding the upper surface of the electromagnetic shielding layer with the lower surface of the touch module layer; S5: fully bonding a solid-state OCA adhesive film on the lower surface of the electromagnetic shielding layer to form a second optical adhesive layer; S6: removing the protective release film on the surface of the second optical adhesive layer, and fully bonding the upper surface of the display module layer with the lower surface of the electromagnetic shielding layer and the touch layer; S7: installing the bonded touch module layer, first optical adhesive layer, electromagnetic shielding layer, second optical adhesive layer and display module layer on the lower surface of the metal bezel layer, and abutting the frame of the metal bezel layer with the edge abutting area of the electromagnetic shielding layer; S8: conductively connecting the metal back shell layer with the metal bezel layer, and fastening with fasteners.

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