Fingerprint identification module with thermochromic function

Abstract

The utility model discloses a fingerprint identification module with a thermochromic function, which relates to the field of fingerprint identification modules and comprises a fingerprint identification module, the fingerprint identification module is provided with a transparent substrate, and a thermochromic layer, a europium titanate layer and a protective coating layer are sequentially laminated on the upper surface of the transparent substrate; according to the utility model, the fingerprint identification module has a dynamic color changing function through the temperature-sensing color changing layer, the product aesthetic degree and the user experience are improved, a user can intuitively sense the module temperature through color change, the temperature visualization function is realized, the use in a high-temperature or low-temperature environment is avoided, and the user experience is improved. The protective coating layer ensures that the fingerprint identification module stably works in various environments, the durability and the identification performance of the module are improved, the service life of the module is prolonged, and the added value and the market competitiveness of a product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fingerprint identification module technical field, especially, a kind of fingerprint identification module with temperature sensing color change function is involved. BACKGROUND

[0002] In recent years, with the rapid development of biometric technology, fingerprint identification technology gradually replaces traditional password, pattern lock and other authentication methods due to its convenient operation, high security, good user experience and other characteristics, and becomes one of the current mainstream identity authentication technologies. Fingerprint identification system has been widely used in smart phones, access control systems, financial terminals and other fields. The existing fingerprint identification module mainly relies on optical, capacitive, ultrasonic and other sensing technologies, and compares and identifies by collecting user fingerprint images, so as to realize identity verification.

[0003] Chinese patent application No. 201410353941.3 discloses a fingerprint identification device with a plated protective layer and a fingerprint identification assembly. The fingerprint identification device with a plated protective layer includes a fingerprint identification chip and a protective layer covering the surface of the fingerprint identification chip. The protective layer is formed by plating. In this scheme, a relatively thin protective layer can be formed by plating. The protective layer is formed on the surface of the fingerprint identification chip and becomes part of the fingerprint identification device, eliminating the need for subsequent lens formation for protection, reducing the process steps. Since the protective layer formed by the above method is relatively thin, the attenuation of the fingerprint signal through the protective layer can be reduced, the sensitivity of the fingerprint identification chip can be enhanced, and the fingerprint identification efficiency can be improved.

[0004] The existing fingerprint identification module is provided with a protective layer with a plating structure, which can provide surface protection for the fingerprint identification module. However, the existing fingerprint identification module has the following problems in terms of appearance design and user experience:

[0005] 1. Single appearance: the appearance of traditional fingerprint identification modules lacks personalized design and cannot meet the needs of users for aesthetics;

[0006] 2. Single function: the existing module only has fingerprint identification function and lacks additional value;

[0007] 3. Temperature sensitivity: the fingerprint identification module may have performance degradation in high or low temperature environment, but users cannot intuitively perceive temperature changes.

[0008] Therefore, the utility model discloses a fingerprint identification module with temperature sensing color change function to solve the above problems. UTILITY MODEL CONTENT

[0009] Therefore, it is necessary to provide a fingerprint identification module with temperature-sensing color changing function in view of the above technical problems, which realizes appearance personalization, temperature visualization and performance optimization by combining a temperature-sensing color changing layer with a multi-layer functional film layer, improves the durability and identification performance of the module, prolongs the service life of the module, and improves the added value and market competitiveness of the product.

[0010] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0011] A fingerprint identification module with temperature-sensing color changing function, comprising a fingerprint identification module, the fingerprint identification module has a transparent substrate, the upper surface of the transparent substrate is sequentially stacked with a temperature-sensing color changing layer, an europium titanate layer and a protective plating film layer.

[0012] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, the fingerprint identification module comprises a fingerprint identification sensor and a flexible circuit board, the fingerprint identification sensor is electrically connected with the flexible circuit board, and the transparent substrate is located above the fingerprint identification sensor.

[0013] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, one surface of the flexible circuit board away from the fingerprint identification sensor is provided with a reinforcing plate, and the edge of the reinforcing plate is welded and fixed with the flexible circuit board.

[0014] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, the protective plating film layer comprises an aluminum oxynitride layer and a zirconium nitride layer, the aluminum oxynitride plating film layer is arranged on one surface of the europium titanate layer away from the temperature-sensing color changing layer, and the zirconium nitride layer is arranged on one surface of the aluminum oxynitride layer away from the europium titanate layer.

[0015] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, the thickness of the aluminum oxynitride layer is 100-150 nanometers, and the thickness of the zirconium nitride layer is 50-100 nanometers.

[0016] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, the thickness of the europium titanate layer is 80-120 nanometers.

[0017] As a preferred embodiment of the fingerprint identification module with temperature-sensing color changing function provided by the utility model, the temperature-sensing color changing layer is a temperature-sensing color changing ink layer, the temperature-sensing color changing ink layer has microcapsule temperature changing color changing materials, and the temperature-sensing color changing ink layer can change color at different temperatures.

[0018] As a preferred embodiment of the fingerprint identification module with the temperature-sensitive color change function provided by the utility model, the thickness of the temperature-sensitive color change layer is 6-10 microns.

[0019] As a preferred embodiment of the fingerprint identification module with the temperature-sensitive color change function provided by the utility model, the temperature-sensitive color change layer, the europium titanate layer and the protective plating film layer cover the entire transparent substrate.

[0020] As a preferred embodiment of the fingerprint identification module with the temperature-sensitive color change function provided by the utility model, the transparent substrate has a fingerprint identification area and a peripheral area, and the temperature-sensitive color change layer is arranged in the peripheral area.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The fingerprint identification module with the temperature-sensitive color change function provided by the utility model has the dynamic color change function through the temperature-sensitive color change layer, improves the product appearance and user experience, the user can intuitively perceive the module temperature through the color change, realizes the temperature visualization function, avoids use in the high-temperature or low-temperature environment, the protective plating film layer ensures that the fingerprint identification module stably works in various environments, improves the durability and identification performance of the module, prolongs the module life, and improves the additional value and market competitiveness of the product. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the scheme in the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0024] Figure 1 It is the overall structure side view schematic drawing of the fingerprint identification module with the temperature-sensitive color change function provided by the utility model;

[0025] Figure 2 It is the overall structure plane schematic drawing of the fingerprint identification module with the temperature-sensitive color change function provided by the utility model;

[0026] Figure 3 It is the transparent substrate side view schematic drawing in the fingerprint identification module with the temperature-sensitive color change function provided by the utility model;

[0027] Figure 4 It is the transparent substrate plane schematic drawing in the fingerprint identification module with the temperature-sensitive color change function provided by the utility model.

[0028] The mark in the drawing is as follows:

[0029] 1. transparent substrate; 101, fingerprint identification area; 102, peripheral area; 2, temperature-sensitive color-changing layer; 3, europium titanate layer; 4, aluminum oxynitride layer; 5, zirconium nitride layer; 6, fingerprint identification sensor; 7, flexible circuit board; 8, reinforcing plate. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0031] As described in the background, the existing fingerprint identification module has the following problems in appearance design and user experience:

[0032] 1. Single appearance: the appearance of the traditional fingerprint identification module lacks personalized design, and it is difficult to meet the demand of users for beauty;

[0033] 2. Single function: the existing module only has fingerprint identification function, and lacks additional value;

[0034] 3. Temperature sensitivity: the fingerprint identification module may have performance degradation in high-temperature or low-temperature environment, but the user cannot intuitively perceive the temperature change.

[0035] In order to solve this technical problem, the present application provides a fingerprint identification module with temperature-sensitive color-changing function, which is applied to the field of fingerprint identification module.

[0036] Specifically, please refer to Figures 1-4 , the fingerprint identification module with temperature-sensitive color-changing function specifically comprises a fingerprint identification module, the fingerprint identification module has a transparent substrate 1, and the upper surface of the transparent substrate 1 is sequentially stacked with a temperature-sensitive color-changing layer 2, a europium titanate layer 3 and a protective coating layer.

[0037] The fingerprint identification module with temperature-sensitive color-changing function provided by the present application has dynamic color-changing function through the temperature-sensitive color-changing layer 2, improves the product appearance and user experience, the user can intuitively perceive the module temperature through color change, realizes temperature visualization function, avoids use in high-temperature or low-temperature environment, the protective coating layer ensures the stable work of the fingerprint identification module in various environments, improves the durability and identification performance of the module, prolongs the service life of the module, and improves the additional value and market competitiveness of the product.

[0038] In order for the person skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0039] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0040] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] Embodiment one

[0042] Please refer to Figures 1-4 , provides a kind of thermochromic function's fingerprint identification module, it includes fingerprint identification module, fingerprint identification module has transparent substrate 1, transparent substrate 1 is transparent glass, the upper surface of transparent substrate 1 is sequentially stacked with thermochromic layer 2, europium titanate layer 3 and protective coating layer, europium titanate layer 3 is combined with thermochromic layer 2, enhances temperature sensitivity, and provides excellent dielectric properties, optimizes fingerprint identification signal transmission.Specifically, europium titanate has temperature sensitivity, and europium titanate is a material with thermoelectric properties, and its electrical properties (such as resistivity) will change significantly with temperature change.This characteristic enables it to perceive temperature changes, and europium titanate will undergo phase transition within a certain temperature range, resulting in changes in its optical and electrical properties, thereby enhancing the sensitivity to temperature;Europium titanate layer 3 enhances temperature sensitivity through thermoelectric effect and phase transition characteristics, and cooperates with thermochromic layer 2 to realize the visualization of temperature change.

[0043] Further, the fingerprint identification module includes a fingerprint identification sensor 6 and a flexible circuit board 7, the fingerprint identification sensor 6 is electrically connected with the flexible circuit board 7, the transparent substrate 1 is located above the fingerprint identification sensor 6, and a circuit layer is provided on the upper surface of the fingerprint identification sensor 6, and the transparent substrate 1 is located on the upper side of the circuit layer.Of course, the fingerprint identification module also includes other structures, such as a fixing kit, which is arranged on the outer side of the fingerprint identification sensor 6 and is fixedly connected with the transparent substrate 1, and this part is a conventional structure, which will not be described in detail here.

[0044] The surface of the flexible circuit board 7 away from the fingerprint identification sensor 6 is provided with a reinforcing plate 8, the edge of the reinforcing plate 8 is welded and fixed with the flexible circuit board 7, and the reinforcing plate 8 is a steel sheet or other hard material to improve the strength of the flexible circuit board 7.

[0045] The protective coating layer includes an aluminum oxynitride layer 4 and a zirconium nitride layer 5. The aluminum oxynitride coating layer is disposed on the surface of the europium titanate layer 3 away from the thermochromic layer 2, and the zirconium nitride layer 5 is disposed on the surface of the aluminum oxynitride layer 4 away from the europium titanate layer 3. The thickness of the aluminum oxynitride layer 4 is 100-150 nanometers, preferably 130 nanometers in this example, and the thickness of the zirconium nitride layer is 550-100 nanometers, preferably 70 nanometers in this example. The aluminum oxynitride layer 4, as an intermediate layer, enhances the optical transparency and impact resistance of the fingerprint recognition module, while also improving the mechanical strength of the module, enhancing optical performance and mechanical strength, and ensuring the accuracy and stability of fingerprint recognition. The zirconium nitride layer 5, as a surface layer, provides the fingerprint recognition module with high hardness, wear resistance, and corrosion resistance, protecting the surface of the fingerprint recognition module and extending its service life.

[0046] The thickness of europium titanate layer 3 is 80-120 nanometers, and in this example, it is preferably 100 nanometers.

[0047] A thermochromic layer 2, a europium titanate layer 3, and a protective coating layer cover the entire transparent substrate 1. This fingerprint recognition module is used in smart door locks, financial payment terminals, access control systems, etc.

[0048] Example 2

[0049] The fingerprint recognition module with temperature-sensitive color-changing function provided in Embodiment 1 is further optimized, specifically, as follows: Figure 3 As shown, the thermochromic layer 2 is a thermochromic ink layer, and it contains microcapsule thermochromic materials with a particle size range of 50-200 nm. The thermochromic ink layer can change color at different temperatures, and the temperature sensitivity of the europium titanate layer 3 can enhance the response capability of the thermochromic ink. When the temperature changes, the change in the electrical properties of europium titanate triggers physical or chemical changes in the microcapsule structure of the ink, thereby changing the color. The europium titanate layer 3 converts the temperature change into an electrical signal, which is transmitted to the color-changing ink through the internal circuit of the module, enabling it to respond to temperature changes more quickly and accurately. Europium titanate layer 3 not only enhances temperature sensitivity but also serves as an optimization layer for signal transmission. By optimizing dielectric properties, impedance matching, and interference shielding, it improves the transmission efficiency and quality of fingerprint recognition signals. Specifically: europium titanate has excellent dielectric properties, which can reduce energy loss during signal transmission and improve recognition efficiency; the electrical properties of the europium titanate film can adjust the impedance of the signal transmission path, reduce signal reflection and interference, and enhance recognition accuracy; the europium titanate film can shield external electromagnetic interference, ensuring the purity of the fingerprint recognition signal.

[0050] In the present case, the microcapsule temperature-induced color-changing material is selected from low-temperature color-changing material and / or high-temperature color-changing material, wherein the color-changing agent in the low-temperature color-changing material is crystal violet lactone (CVL) or spiropyran, the color-developing agent is bisphenol A (BPA) or zinc stearate, and the solvent is tetradecanol or hexadecanol, such as CVL (1%) + BPA (4%) + tetradecanol (95%), the color-changing behavior is: blue at low temperature (<5°C), and colorless at high temperature (>10°C); the color-changing agent in the high-temperature color-changing material is heat-sensitive black (ODB-2) or fluoran compound, the color-developing agent is bisphenol AF (BFPA) or benzyl p-hydroxybenzoate, and the solvent is benzyl benzoate or benzophenone, such as ODB-2 (2%) + BFPA (5%) + benzyl benzoate (93%), the color-changing behavior is: colorless at room temperature (25°C), and black at high temperature (>65°C). Of course, other microcapsule temperature-induced color-changing materials can also be selected for preparation, such as spiropyran-silica composite nanoparticles, which have a color-changing temperature range of 25°C to 40°C, facilitating in vivo verification. The thickness of the temperature-induced color-changing layer 2 is 6-10 microns, which is screen-printed on the surface of the transparent substrate 1.

[0051] Example Three

[0052] The fingerprint identification module with temperature-induced color-changing function provided in Example Two is further optimized, specifically, as shown in Figure 4 The transparent substrate 1 has a fingerprint identification area 101 and a peripheral area 102, and the temperature-induced color-changing layer 2 is arranged in the peripheral area 102. This kind of structure design can avoid the temperature-induced color-changing layer 2 from blocking the display area after color-changing, thereby affecting the normal use of the electronic device. The fingerprint identification module is mainly applied to smart phones, tablet computers and smart watches.

[0053] The working principle of the fingerprint identification module with temperature-induced color-changing function provided by the utility model is as follows: the temperature-induced color-changing layer 2 enables the fingerprint identification module to have a dynamic color-changing function, thereby improving the product appearance and user experience. The user can intuitively perceive the module temperature through color change, realize temperature visualization function, avoid use in high-temperature or low-temperature environment, protect the plating layer to ensure the stable work of the fingerprint identification module in various environments, improve the durability and identification performance of the module, prolong the service life of the module, and improve the added value and market competitiveness of the product.

[0054] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0055] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and not all the embodiments, and the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model.The utility model can be realized in many different forms, and contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.Although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing each specific embodiment can be modified, or part of the technical features can be replaced equivalently.For equivalent structure made by using the contents of the utility model specification and drawings, direct or indirect use in other related technical fields, are also within the patent protection range of the utility model.

Claims

1. A fingerprint recognition module with temperature-sensitive color-changing function, comprising a fingerprint recognition module, characterized in that, The fingerprint recognition module has a transparent substrate, and a thermochromic layer, a europium titanate layer and a protective coating layer are sequentially stacked on the upper surface of the transparent substrate.

2. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The fingerprint recognition module includes a fingerprint recognition sensor and a flexible circuit board. The fingerprint recognition sensor is electrically connected to the flexible circuit board, and the transparent substrate is located above the fingerprint recognition sensor.

3. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 2, characterized in that, A reinforcing plate is provided on the surface of the flexible circuit board away from the fingerprint recognition sensor, and the edge of the reinforcing plate is welded and fixed to the flexible circuit board.

4. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The protective coating layer includes an aluminum oxynitride layer and a zirconium nitride layer. The aluminum oxynitride layer is disposed on the surface of the europium titanate layer away from the thermochromic layer, and the zirconium nitride layer is disposed on the surface of the aluminum oxynitride layer away from the europium titanate layer.

5. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 4, characterized in that, The aluminum oxynitride layer has a thickness of 100-150 nanometers, and the zirconium nitride layer has a thickness of 50-100 nanometers.

6. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The thickness of the europium titanate layer is 80-120 nanometers.

7. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The thermochromic layer is a thermochromic ink layer, and the thermochromic ink layer contains microcapsule thermochromic materials, which can change color at different temperatures.

8. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The thickness of the thermochromic layer is 6-10 micrometers.

9. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The thermochromic layer, europium titanate layer, and protective coating layer cover the entire transparent substrate.

10. A fingerprint recognition module with temperature-sensitive color-changing function according to claim 1, characterized in that, The transparent substrate has a fingerprint recognition area and a peripheral area, and the thermochromic layer is located in the peripheral area.

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