Fingerprint identification module with coating protection layer and intelligent terminal

Abstract

The utility model discloses a fingerprint identification module with a coating film protection layer and an intelligent terminal, and relates to the field of fingerprint identification modules, the upper surface of the fingerprint identification module is covered with a plurality of coating film layers, the coating film layers comprise an aluminum silicate layer, a polyester resin layer and a silicon dioxide layer, and the intelligent terminal comprises the fingerprint identification module; the upper surface of the fingerprint identification module is provided with the multiple coating layers, the aluminum silicate layer enhances the chemical resistance and scratch resistance of the module, the polyester resin layer improves the toughness and impact resistance of the module, the silicon dioxide layer improves the hardness and wear resistance of the module, the durability of the fingerprint identification module is remarkably improved through the addition of the multiple coating layers, and the service life of the fingerprint identification module is prolonged. According to the fingerprint identification module, the service life of the fingerprint identification module is prolonged, the antifouling performance, the scratch resistance and the chemical resistance of the module are improved, the fingerprint identification module is more suitable for being used in various environments, the use range of a terminal product is widened, high light transmission is kept, the accuracy and the speed of fingerprint identification are ensured, the overall use experience of a user is improved, and the product competitiveness is improved.

Description

Technical Field

[0001] This utility model relates to the field of fingerprint recognition module technology, and in particular to a fingerprint recognition module and smart terminal with a protective coating. Background Technology

[0002] With the widespread adoption of smart devices, biometric technology, especially fingerprint recognition, has become one of the important identity verification methods in smartphones, tablets, laptops, and other smart terminals. Due to its ease of use, high security, and user-friendly experience, fingerprint recognition technology has gradually replaced traditional authentication methods such as passwords and pattern locks, becoming one of the mainstream identity authentication technologies today.

[0003] Fingerprint recognition modules are widely used in mobile smart devices such as smartphones, tablets, and smartwatches. They also find extensive applications in finance, security, and access control. For example, fingerprint recognition is used as a crucial step in identity verification in mobile payments and online banking. In smart home and security devices, fingerprint recognition technology is used for authentication in door locks and monitoring systems, enhancing device security.

[0004] Chinese patent application number 201410353941.3 discloses a fingerprint recognition device and a fingerprint recognition assembly with a protective coating layer. The fingerprint recognition device includes a fingerprint recognition chip and a protective layer covering the surface of the fingerprint recognition chip. The protective layer is formed by a coating process. This method uses a coating process to form a thinner protective layer, which is formed on the surface of the fingerprint recognition chip and becomes part of the fingerprint recognition device. This eliminates the need for a subsequent lens for protection, reducing process steps. Because the protective layer formed in this way can be thinner, the attenuation of the fingerprint signal after passing through the protective layer can be reduced, enhancing the sensitivity of the fingerprint recognition chip and improving fingerprint recognition efficiency.

[0005] Traditional fingerprint recognition modules typically use a single-material protective layer, which provides some protection but suffers from poor wear resistance, chemical resistance, and impact resistance. This makes the fingerprint recognition module susceptible to environmental influences during use, reducing its recognition accuracy and lifespan, and limiting the application of terminal products. Therefore, this utility model discloses a fingerprint recognition module and smart terminal with a coated protective layer, solving the above problems. Utility Model Content

[0006] Therefore, it is necessary to address the aforementioned technical issues by providing a fingerprint recognition module and smart terminal with a protective coating layer. By adding multiple coating layers to the fingerprint recognition module, the module's durability and protective performance are significantly improved, while maintaining high light transmittance. The terminal product can be used in various environments, meeting the market's demand for high-performance fingerprint recognition modules.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A fingerprint recognition module with a protective coating layer includes a fingerprint recognition module, the upper surface of which is covered with multiple coating layers, the coating layers including an aluminum silicate layer, a polyester resin layer and a silicon dioxide layer.

[0009] In a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, the aluminum silicate layer is coated on the upper surface of the fingerprint recognition module, the polyester resin layer is located above the aluminum silicate layer, and the silicon dioxide layer is located above the polyester resin layer.

[0010] In a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, the thickness of the aluminum silicate layer is 30-80 nanometers.

[0011] In a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, the thickness of the polyester resin layer is 50-100 nanometers.

[0012] In a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, the thickness of the silicon dioxide layer is 100-150 nanometers.

[0013] As a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, the fingerprint recognition module includes a fingerprint acquisition area and a peripheral area, wherein the peripheral area is screen-printed with an ink layer.

[0014] As a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, it further includes a functional layer, which is located on the outermost layer of the coating layer. The functional layer is one of an anti-fingerprint coating layer, an anti-static coating layer, or a hydrophobic coating layer.

[0015] As a preferred embodiment of the fingerprint recognition module with a protective coating layer provided by this utility model, the functional layer is an anti-fingerprint coating layer, and the thickness of the anti-fingerprint coating layer is 50-100 nanometers.

[0016] As a preferred embodiment of the fingerprint recognition module with a protective coating provided by this utility model, it further includes a transition layer, which is disposed between the aluminum silicate layer and the polyester resin layer, and the transition layer is an interface bonding layer composed of chromium, titanium or silane coupling agent.

[0017] A smart terminal includes the fingerprint recognition module with a protective coating as described above.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model provides a fingerprint recognition module and smart terminal with a protective coating. The upper surface of the fingerprint recognition module is coated with multiple layers: an aluminum silicate layer enhances the module's chemical resistance and scratch resistance, a polyester resin layer improves the module's toughness and impact resistance, and a silica layer increases the module's hardness and wear resistance. The addition of multiple coatings significantly improves the durability of the fingerprint recognition module, extends its service life, and enhances its anti-fouling, scratch-resistant, and chemical resistance properties, making it more suitable for use in various environments and broadening the application range of the terminal product. At the same time, it maintains high light transmittance, ensuring the accuracy and speed of fingerprint recognition, improving the overall user experience, and enhancing product competitiveness. Attached Figure Description

[0020] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A side view of Embodiment 1 of the fingerprint recognition module with a protective coating provided by this utility model;

[0022] Figure 2 A side view of Embodiment 3 of the fingerprint recognition module with a protective coating provided by this utility model;

[0023] Figure 3 A schematic diagram of a fingerprint recognition module with a protective coating provided by this utility model.

[0024] The markings in the diagram are explained as follows:

[0025] 1. Fingerprint recognition module; 101. Fingerprint acquisition area; 102. Peripheral area; 2. Aluminum silicate layer; 3. Polyester resin layer; 4. Silica layer; 5. Functional layer; 6. Transition layer; 7. Ink layer. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] As described in the background section, traditional fingerprint recognition modules typically use a single-material protective layer. While this provides some protection, its performance in terms of wear resistance, chemical resistance, and impact resistance is poor. As a result, fingerprint recognition modules are easily affected by the external environment during use, which reduces their recognition accuracy and lifespan, thus limiting the application of terminal products.

[0028] To address this technical problem, this utility model provides a fingerprint recognition module and smart terminal with a protective coating, which is applied in the field of fingerprint recognition module technology.

[0029] For details, please refer to Figure 1-3 The fingerprint recognition module with a protective coating layer specifically includes a fingerprint recognition module 1. The upper surface of the fingerprint recognition module 1 is covered with multiple coating layers, including an aluminum silicate layer 2, a polyester resin layer 3, and a silicon dioxide layer 4.

[0030] Specifically, the smart terminal includes the fingerprint recognition module with a protective coating layer mentioned above.

[0031] The fingerprint recognition module and smart terminal with a protective coating provided by this utility model have multiple coating layers on the upper surface of the fingerprint recognition module 1. The aluminum silicate layer 2 enhances the module's chemical resistance and scratch resistance, the polyester resin layer 3 improves the module's toughness and impact resistance, and the silicon dioxide layer 4 increases the module's hardness and wear resistance. The addition of multiple coating layers significantly improves the durability of the fingerprint recognition module 1 and extends its service life. The module's anti-fouling, anti-scratch, and chemical resistance are improved, making it more suitable for use in various environments and broadening the application range of the terminal product. At the same time, it maintains high light transmittance, ensuring the accuracy and speed of fingerprint recognition, improving the overall user experience, and enhancing product competitiveness.

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] Example 1

[0036] Please refer to Figure 1-3 A fingerprint recognition module with a protective coating is provided, comprising a fingerprint recognition module 1, the upper surface of which is covered with multiple coating layers. The fingerprint recognition module 1 includes a fingerprint recognition sensor, and a circuit layer is provided on the surface of the fingerprint recognition sensor. The coating layers cover the circuit layer. The coating layers include an aluminum silicate layer 2, a polyester resin layer 3, and a silicon dioxide layer 4. The total light transmittance of the multiple coating layers is ≥90% (wavelength 400-800nm), and the haze value is ≤2%. The silicon dioxide layer 4 significantly improves the hardness and wear resistance of the module, reducing wear during daily use. The polyester resin layer 3... The module's toughness and impact resistance are improved, making it more resistant to drops and impacts. The polyester resin layer 3 has excellent UV resistance, effectively blocking UV rays from damaging the fingerprint recognition module 1. The addition of the aluminum silicate layer 2 enhances the module's chemical resistance, enabling it to resist common chemicals such as sweat and detergents. Despite the addition of multiple coating layers, the module's light transmittance is still guaranteed due to the proper control of the thickness of each layer, without affecting the accuracy of fingerprint recognition. These coating layers are applied to the front of the fingerprint recognition module 1 to improve the module's durability, clarity, and anti-fouling performance.

[0037] Furthermore, the aluminum silicate layer 2 is deposited on the upper surface of the fingerprint recognition module 1, the polyester resin layer 3 is located above the aluminum silicate layer 2, and the silicon dioxide layer 4 is located above the polyester resin layer 3, so that the aluminum silicate layer 2, the polyester resin layer 3 and the silicon dioxide layer 4 are sequentially prepared from the upper surface of the fingerprint recognition module 1.

[0038] Furthermore, the aluminum silicate layer 2 has a thickness of 30-80 nanometers and a porosity of 5-15%, with a gradient distribution of pores. The porosity of the surface layer is 3-8 percentage points lower than that of the bottom layer. The polyester resin layer 3 also contains 0.5-2% nano-reinforcing material, which is selected from at least one of nano-zinc oxide, carbon fiber, or titanium dioxide. The average particle size of the nano-reinforcing material is 20-100 nm, and the aspect ratio is >10:1. The polyester resin layer 3 has a thickness of 50-100 nanometers, and the silicon dioxide layer 4 has a thickness of 100-150 nanometers, a crystallinity ≥70%, and a refractive index of 1.45-1.48. By controlling the thickness of each coating layer, the light transmittance of the module is still guaranteed, ensuring the accuracy and speed of fingerprint recognition.

[0039] Specifically, a 50 nm aluminum silicate layer 2 is atomically deposited and grown on the surface of the fingerprint recognition module 1 at a deposition temperature of 250 °C. A polyester resin layer 3 (80 nm thick) containing 0.3% nanodiamond is then spin-coated, and UV curing is performed to form a network cross-linked structure. A silica anti-reflective layer is then prepared on the surface of the resin layer using nanoimprint lithography, with a grating period of 350 nm and a depth of 125 nm. Alternatively, the aluminum silicate layer 2, polyester resin layer 3, and silica layer 4 can also be prepared using PVD deposition, CVD deposition, or sputtering deposition methods.

[0040] Furthermore, a functional layer 5 is provided on the surface of the top silicon dioxide layer 4. The functional layer 5 is the surface layer of the coating layer. The functional layer 5 is located in one of the anti-fingerprint coating layer, anti-static coating layer or hydrophobic coating layer. The functional layer 5 realizes environmental protection and surface performance optimization. Specifically, the hydrophobic coating is made of fluoropolymers (such as polytetrafluoroethylene PTFE, fluorosilicone resin) or organosilicon materials doped with silica nanoparticles to prevent the adhesion of contaminants such as sweat and oil stains and maintain the stability of optical transmittance; the antistatic coating is made of graphene or carbon nanotube composite film with a thickness of 10-50 nanometers to avoid misjudgment caused by dust adsorption, and is especially suitable for dusty environments; the anti-fingerprint coating is a fluorocarbon resin-based coating that can reduce the adhesion of fingerprint grease (mainly composed of squalene and fatty acids), sweat, dust and other contaminants, achieving superhydrophobic and oleophobic properties, preventing liquid residue from affecting optical signals, easy to clean, and can also reduce the coefficient of friction and reduce mechanical wear in daily use. While achieving anti-fouling, it maintains high transmittance and low haze. Therefore, in this example, functional layer 5 is an anti-fingerprint coating layer with a thickness of 50-100 nanometers.

[0041] Example 2

[0042] The fingerprint recognition module with a protective coating provided in Embodiment 1 is further optimized, specifically, as follows: Figure 3 As shown, the fingerprint recognition module 1 includes a fingerprint acquisition area 101 and a peripheral area 102. The peripheral area 102 is screen-printed with an ink layer 7. The ink layer 7 is screen-printed on the surface of the fingerprint recognition module 1. The ink layer 7 is made of black ink, but other inks can also be used. The ink layer 7 can be freely enlarged or reduced according to different needs. By using inks of different colors or patterns, the appearance design of the module can be improved, making it more coordinated with the appearance of the device. At the same time, it can also enhance the brand recognition in terms of appearance, and can also play a role in shielding light, reducing unnecessary light interference, and ensuring the stability of fingerprint recognition.

[0043] Example 3

[0044] The fingerprint recognition module with a protective coating provided in Embodiment 2 is further optimized, specifically, as follows: Figure 2As shown, a transition layer 6 is also included, which is disposed between the aluminum silicate layer 2 and the polyester resin layer 3. The transition layer 6 is an interfacial bonding layer composed of chromium, titanium, or a silane coupling agent. The transition layer 6 can solve the chemical bonding problem between inorganic and organic materials, strengthen the interfacial bonding, alleviate the interfacial stress caused by the difference in the thermal expansion coefficients between layers, optimize the gradient transition of optical refractive index / acoustic impedance, and reduce signal loss. In this example, a titanium layer is preferred as the transition layer 6, which is deposited by magnetron sputtering with a sputtering power of 100-200W and an argon flow rate of 20-50 sccm.

[0045] Of course, the transition layer 6 can also be set between the polyester resin layer 3 and the silica layer 4. The transition layer 6 is made of silane coupling agent, such as KH-550 or KH-792. The liquid phase impregnation method is used to premix 0.5-2% of the coupling agent into the polyester resin. During curing, the coupling agent migrates to the interface to form chemical bonds.

[0046] Example 4

[0047] This embodiment provides a smart terminal, which includes one of the fingerprint recognition modules with a protective coating layer as described in embodiments one to three. The smart terminal can be a smartphone, tablet computer, smartwatch, smart door lock, financial payment terminal, access control system, etc.

[0048] The working principle of the fingerprint recognition module with a protective coating provided by this utility model is as follows: Multiple coating layers are set on the upper surface of the fingerprint recognition module 1. The aluminum silicate layer 2 enhances the module's chemical resistance and scratch resistance, the polyester resin layer 3 improves the module's toughness and impact resistance, and the silicon dioxide layer 4 increases the module's hardness and wear resistance. The addition of multiple coating layers significantly improves the durability of the fingerprint recognition module 1, extends its service life, and enhances the module's anti-fouling, anti-scratch, and chemical resistance properties, making it more suitable for use in various environments and broadening the application range of terminal products. At the same time, it maintains high light transmittance, ensuring the accuracy and speed of fingerprint recognition, improving the overall user experience, and enhancing product competitiveness.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A fingerprint recognition module with a protective coating, comprising a fingerprint recognition module, characterized in that, The upper surface of the fingerprint recognition module is covered with multiple coating layers, including an aluminum silicate layer, a polyester resin layer, and a silicon dioxide layer.

2. The fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, The aluminum silicate layer is plated on the upper surface of the fingerprint recognition module, the polyester resin layer is located above the aluminum silicate layer, and the silicon dioxide layer is located above the polyester resin layer.

3. A fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, The thickness of the aluminum silicate layer is 30-80 nanometers.

4. A fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, The thickness of the polyester resin layer is 50-100 nanometers.

5. A fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, The thickness of the silicon dioxide layer is 100-150 nanometers.

6. A fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, The fingerprint recognition module includes a fingerprint acquisition area and a peripheral area, and the peripheral area is screen-printed with an ink layer.

7. A fingerprint recognition module with a protective coating as described in claim 1, characterized in that, It also includes a functional layer, which is located on the outermost layer of the coating layer. The functional layer is one of an anti-fingerprint coating layer, an antistatic coating layer, or a hydrophobic coating layer.

8. A fingerprint recognition module with a protective coating layer according to claim 7, characterized in that, The functional layer is an anti-fingerprint coating layer, and the thickness of the anti-fingerprint coating layer is 50-100 nanometers.

9. A fingerprint recognition module with a protective coating layer according to claim 1, characterized in that, It also includes a transition layer, which is disposed between the aluminum silicate layer and the polyester resin layer. The transition layer is an interfacial bonding layer composed of chromium, titanium or silane coupling agent.

10. A smart terminal, characterized in that, The fingerprint recognition module with a protective coating as described in any one of claims 1-9.

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