Fingerprint recognition module, wearable device and fingerprint recognition method

Abstract

The present application discloses a fingerprint recognition module, a wearable device and a fingerprint recognition method, wherein the fingerprint recognition module comprises: a curved cover plate, the curved cover plate comprises an outer surface that is convex or concave and an inner surface that is parallel to and opposite to the outer surface; and a plurality of interconnected fingerprint recognition chips located on the inner surface of the curved cover plate. The fingerprint recognition module of the present application can be well adapted to wearable devices with curved surfaces (such as smart watches or smart bracelets), realizes the fingerprint recognition function of the wearable device, and can ensure the beautiful appearance of the wearable device while ensuring that the fingerprint recognition has high accuracy and security. In addition, the volume occupied by the fingerprint recognition module of the present application is also relatively small.

Description

Technical Field

[0001] The present application relates to the field of fingerprint recognition technology, and in particular to a fingerprint recognition module adapted to a curved surface, a wearable device, and a fingerprint recognition method. Background Art

[0002] In biometric technology, fingerprint recognition is a high-security, high-performance, low-cost biometric technology currently widely used in smartphones, laptops, tablets, smart door locks, access control systems and other products. Fingerprint recognition sensors are divided into two parts: hardware and software. The hardware part obtains fingerprint images through different sensing principles such as capacitance, optics, and ultrasound. The software part includes hardware drivers and fingerprint image matching.

[0003] Although fingerprint recognition technology is widely used in many electronic products, there is currently no mature application solution for fingerprint recognition technology in wearable electronic products such as smart watches and smart bracelets. Summary of the invention

[0004] In view of this, the present application provides a fingerprint recognition module, a wearable device and a fingerprint recognition method that are adaptable to curved surfaces to solve the problem that there is currently no mature application solution for fingerprint recognition technology on wearable electronic products such as smart watches and smart bracelets.

[0005] The present application provides a fingerprint recognition module, comprising:

[0006] A curved cover plate, the curved cover plate comprising an outer surface that is convex or concave and an inner surface that is parallel to and opposite to the outer surface;

[0007] A plurality of interconnected fingerprint recognition chips are located on the inner surface of the curved cover plate.

[0008] Optionally, the plurality of fingerprint recognition chips are interconnected via a flexible printed circuit board.

[0009] Optionally, the plurality of fingerprint recognition chips include a master chip and at least one slave chip connected to the master chip.

[0010] Optionally, the master chip includes a sensor pixel array and corresponding reading and control circuits, and the slave chip includes a sensor pixel array and corresponding reading and control circuits. Both the master chip and the slave chip are used to collect fingerprint images when the finger contacts the outer surface of the curved cover plate. The master chip is also used to control the slave chip, coordinate the image collection timing and inter-chip communication, and transmit the data to an external system in a unified manner.

[0011] Optionally, an event monitoring module is provided in the master chip and / or the slave chip, and the event monitoring module is used to issue an interrupt signal when a specific event is detected. The master chip is also used to wake up the master chip and sensor pixels and control circuits in the slave chip that are in a turned-off or dormant state based on the interrupt signal issued by the event monitoring module.

[0012] Optionally, when an event monitoring module is set in the main chip, the event monitoring module includes some normally-on pixels in the main chip. When the some normally-on pixels detect that a finger contacts the outer surface of the curved cover, the event monitoring module sends an interrupt signal. The main chip wakes up other pixels in the main chip and sensor pixels and control circuits in the slave chip based on the interrupt signal sent by the event monitoring module.

[0013] Optionally, the plurality of fingerprint recognition chips are all slave chips, and further include a master chip connected to the plurality of fingerprint recognition chips, wherein the master chip is used to control the slave chips, coordinate image acquisition timing and inter-chip communication, and uniformly transmit data to an external system.

[0014] Optionally, the plurality of fingerprint recognition chips are bonded to the inner surface of the curved cover plate by adhesive or plastic packaging material.

[0015] Optionally, the sides of the plurality of fingerprint recognition chips and the gaps between the plurality of fingerprint recognition chips are filled with adhesive or plastic packaging material.

[0016] Optionally, the fingerprint recognition chip performs fingerprint detection based on capacitance, optics or ultrasound principles.

[0017] Optionally, the fingerprint recognition chip is packaged in LGA, BGA or CSP.

[0018] Optionally, the plurality of fingerprint recognition chips are bare chips, and the plurality of fingerprint recognition chips are interconnected with a flexible printed circuit board via a COB method.

[0019] The present invention also provides a wearable device, comprising:

[0020] The fingerprint recognition module mentioned above is used to obtain the user's fingerprint;

[0021] The matching module is used to match the acquired fingerprint with the stored target fingerprint, and if they match, control the wearable device to unlock or issue a specific instruction.

[0022] Optionally, the wearable device has a convex or concave side surface, and the fingerprint recognition module is arranged on the side surface of the wearable device and adapts to the curved surface of the side surface of the wearable device.

[0023] Optionally, when the wearable device has a convex side, a fingerprint recognition module having a convex outer surface is disposed on the convex side of the wearable device or embedded in the convex side, and the curvature of the convex outer surface of the curved cover plate in the fingerprint recognition module matches the curvature of the convex side of the wearable device.

[0024] Optionally, when the wearable device has a concave side, a fingerprint recognition module having a concave outer surface is disposed on the concave side of the wearable device or embedded in the convex side, and the curvature of the concave outer surface of the curved cover plate in the fingerprint recognition module matches the curvature of the concave side of the wearable device.

[0025] Optionally, the wearable device is a smart watch or a smart bracelet.

[0026] Optionally, when the wearable device is a smart watch, the dial of the smart watch has a convex or concave side, and the fingerprint recognition module is arranged on the side of the dial of the watch and adapts to the curved surface of the side of the dial of the watch.

[0027] The present invention also provides a fingerprint recognition method, comprising:

[0028] Acquire the user's fingerprint image through the fingerprint recognition chips in the aforementioned fingerprint recognition module;

[0029] The fingerprint images acquired by each fingerprint recognition chip are stitched together to obtain a complete fingerprint image;

[0030] Entering the obtained complete fingerprint image as a template;

[0031] After entry, the obtained complete fingerprint image is matched with the stored target fingerprint to obtain a matching result.

[0032] Optionally, the stitching includes filling gaps between adjacent fingerprint recognition chips by using a curvature driven diffusion or a texture feature diffusion algorithm.

[0033] The present invention also provides a fingerprint recognition method, comprising:

[0034] Acquire the user's fingerprint image through the fingerprint recognition chips in the aforementioned fingerprint recognition module;

[0035] The fingerprint images obtained by each fingerprint recognition chip are respectively entered as templates;

[0036] After entry, the fingerprint image acquired by each fingerprint recognition chip is matched with the corresponding stored target fingerprint to obtain a matching result.

[0037] Optionally, weighted statistics are performed on the matching results.

[0038] The above-mentioned fingerprint recognition module of the present application, the curved cover plate includes an outer surface that is convex or concave and an inner surface that is parallel to the outer surface, and a plurality of interconnected fingerprint recognition chips are arranged on the inner surface of the curved cover plate, so that the plurality of fingerprint recognition chips can be adapted to the inner surface of the curved cover plate, that is, the plurality of fingerprint recognition chips are arranged along the curvature of the inner surface of the curved cover plate, so that the entire surface connected to the front side (the side with the sensing pixel array) and the back side (the surface opposite to the front side) of the plurality of fingerprint recognition chips is consistent with or substantially the same as the shape of the inner surface, so that the outer surface (the side with the curved cover plate) and the inner surface (the side with the fingerprint recognition chip) of the fingerprint recognition module are both curved, so the fingerprint recognition module of the present application can be well adapted to wearable devices with curved surfaces (such as smart watches or smart bracelets), realize the fingerprint recognition function of the wearable device, and can ensure the beautiful appearance of the wearable device while ensuring that the fingerprint recognition has high accuracy and security. In addition, the volume occupied by the fingerprint recognition module of the present application is also small. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a schematic structural diagram of a fingerprint recognition module according to an embodiment of the present application;

[0041] Figure 2 is a structural schematic diagram of a fingerprint recognition module according to another embodiment of the present application;

[0042] Figure 3 A schematic diagram of the hardware structure of a fingerprint recognition module according to an embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of a wearable device according to an embodiment of the present application;

[0044] Figure 5 is a schematic structural diagram of a wearable device according to another embodiment of the present application;

[0045] Figure 6 It is a flowchart of a fingerprint recognition method according to an embodiment of the present application;

[0046] Figure 7 It is a flowchart of a fingerprint recognition method according to another embodiment of the present application. DETAILED DESCRIPTION

[0047] As mentioned in the background technology, there is currently no mature application solution for fingerprint recognition technology on wearable electronic products such as smart watches and smart bracelets.

[0048] The study found that the difficulties mainly lie in two aspects: First, due to the small size and high integration of devices of wearable electronic products such as smart watches, it is difficult to integrate traditional fingerprint recognition modules into the already very crowded internal space of products; Second, for the sake of beautiful and differentiated appearance design, the surfaces of wearable electronic products such as smart watches are mostly curved, making it difficult to integrate traditional fingerprint recognition modules with flat surfaces.

[0049] To this end, the present invention provides a fingerprint recognition module, a wearable device and a fingerprint recognition method that can adapt to curved surfaces.

[0050] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0051] refer to Figure 1 In one embodiment of the present invention, a fingerprint recognition module 100 is provided, comprising:

[0052] The curved cover plate 101 comprises an outer convex (or concave) surface 11a and an inner surface 11b parallel to and opposite to the outer surface 11a; and a plurality of interconnected fingerprint recognition chips 102 located on the inner surface 11b of the curved cover plate 101.

[0053] Specifically, the curved cover plate 101 is used to protect a plurality of fingerprint recognition chips 102 disposed on the inner surface 11 b and serves as the portion where the user's finger contacts the fingerprint recognition module 100 when the fingerprint recognition module 100 performs fingerprint recognition.

[0054] The curved cover plate 101 is curved. In one embodiment, Figure 1 The curved cover plate 101 includes an outwardly convex outer surface 11a and an inner surface 11b parallel to and opposite to the outer surface 11a. Specifically, when the outer surface 11a of the curved cover plate 101 is convex, the corresponding inner surface 11b of the curved cover plate 101 is concave. The outer surface 11a is the surface of the curved cover plate 101 that contacts the user's finger, and the inner surface 11b is the surface of the curved cover plate 101 for placing a plurality of fingerprint recognition chips 102.

[0055] In another embodiment, the curved cover plate includes a concave outer surface and an inner surface parallel to the outer surface. Specifically, when the outer surface of the curved cover plate is concave, the corresponding inner surface of the curved cover plate is convex. The outer surface is the surface of the curved cover plate that contacts the user's fingers, and the inner surface is the surface of the curved cover plate for placing a number of fingerprint recognition chips.

[0056] In one embodiment, the material of the curved cover plate 101 may be different according to the detection principle of the fingerprint recognition chip 102. The fingerprint recognition chip 102 may perform fingerprint detection based on the detection principle of capacitance, optics or ultrasound, or other detection principles. In some embodiments, the material of the curved cover plate 101 may be glass material, organic material, metal material, or ceramic material. Depending on the sensing principle, the curved cover plate may be light-transmissive or light-opaque, for example, a capacitive fingerprint recognition chip may be light-transmissive or light-opaque, an optical fingerprint recognition chip needs to be light-transmissive, and an ultrasonic fingerprint recognition chip may be light-transmissive or light-opaque.

[0057] The curvature of the curved cover plate 101 is adapted to the curvature of the surface of the wearable device to be installed.

[0058] A number of fingerprint recognition chips 102 are arranged on the inner surface 11b of the curved cover plate 101. When the user touches the outer surface 11a of the curved cover plate 101 with his finger, the number of fingerprint recognition chips 102 detect the user's fingerprint and obtain a fingerprint image. In the fingerprint recognition module 100 of the present application, the number of fingerprint recognition chips 102 are located on the inner surface 11a of the curved cover plate 101 (the side of the fingerprint recognition chip 102 with the sensing pixel array faces the inner surface 11a of the curved cover plate 101), so that the number of fingerprint recognition chips 102 can be adapted to the inner surface 11a of the curved cover plate 101, that is, the number of fingerprint recognition chips 102 are arranged along the curvature of the inner surface 11a of the curved cover plate, so that the front side (the side with the sensing pixel array) and the number of fingerprint recognition chips 102 are The entire surface connected to the back side (the surface opposite to the front side) is consistent with or substantially the same as the shape of the inner surface 11a, so that the outer surface (the side with the curved cover plate) and the inner surface (the side with the fingerprint recognition chip) of the fingerprint recognition module 100 are both curved, so the fingerprint recognition module 100 of the present application can be well adapted to wearable devices with curved surfaces (such as smart watches or smart bracelets), realize the fingerprint recognition function of the wearable device, and ensure the beautiful appearance of the wearable device while ensuring that the fingerprint recognition has high accuracy and security. In addition, the volume occupied by the fingerprint recognition module of the present application is also relatively small.

[0059] In one embodiment, the curved cover plate 101 is in an elongated strip shape, and the plurality of fingerprint identification chips 102 are arranged in sequence in a straight line along the inner surface 11 b of the elongated curved cover plate 101 .

[0060] In one embodiment, the plurality of fingerprint identification chips 102 are bonded to the inner surface 11b of the curved cover plate 101 by means of adhesive or plastic packaging material 103. The adhesive or plastic packaging material may be a polymer material such as glue or film with bonding ability.

[0061] In one embodiment, the side surfaces of the plurality of fingerprint recognition chips 102 and the gaps between the plurality of fingerprint recognition chips 102 are filled with adhesive or plastic packaging material. In other embodiments, the gaps between the plurality of fingerprint recognition chips 102 may not be filled.

[0062] In one embodiment, the plurality of fingerprint recognition chips 102 may be interconnected through a flexible printed circuit board 104 (Flexible Printed Circuit, FPC), so that the plurality of fingerprint recognition chips 102 can be better adapted to the inner surface 11a of the curved cover plate 101. The flexible printed circuit board 104 is located on the back side of the plurality of fingerprint recognition chips 102 (the side of the fingerprint recognition chip 102 where the sensor pixel array is not formed). In other embodiments, the plurality of fingerprint recognition chips 102 may be interconnected in other ways.

[0063] In one embodiment, the fingerprint recognition chip 102 is manufactured by a semiconductor integrated manufacturing process, and the fingerprint recognition chip 102 can be packaged in a LGA (Land Grid Array), BGA (Ball Grid Array) or CSP (Chip Scale Package) packaging method, or other suitable packaging methods, and the packaged fingerprint recognition chip 102 is connected to the flexible printed circuit board 104. The fingerprint recognition chip 102 can be connected to the flexible printed circuit board 104 by welding or bonding.

[0064] In other embodiments, the plurality of fingerprint recognition chips 102 may be bare chips, and the plurality of fingerprint recognition chips 102 are interconnected with the flexible printed circuit board 104 via a COB (Chips on Board, COB) method.

[0065] In one embodiment, the other side of the flexible printed circuit board 104 (the side away from the fingerprint recognition chip 102 ) can be structurally reinforced by a plurality of separate stainless steel or other material reinforcement sheets (not shown in the figure) corresponding to the number of fingerprint recognition chips 102 .

[0066] In one embodiment, please refer to Figure 2and Figure 3 The plurality of fingerprint recognition chips 102 include a master chip 102a and at least one slave chip 102b connected to the master chip 102a.

[0067] The number of the master chip 102a is one, and the number of the slave chips 102b is one or more than one. In this embodiment, one master chip 102a and two slave chips 102b are used as an example for description.

[0068] The master chip 102a includes a sensor pixel array and a corresponding reading and control circuit, and the slave chip 102b includes a sensor pixel array and a corresponding reading and control circuit (the reading and control circuit in the slave chip 102b can be a simple reading and control circuit). The sensor pixel array is used to sense the signal reflected on the finger to generate an electrical signal, and the reading and control circuit is used to control the process of sensing the electrical signal of the sensor pixel array and read and transmit the generated electrical signal. The master chip 102a and the slave chip 102b are both used to collect fingerprint images when the finger contacts the outer surface 11a of the curved cover plate 101. The master chip 102a is also used to control the slave chip 102b, coordinate the image collection timing and inter-chip communication, and uniformly transmit the data to the external system 300 (reference Figure 3 ), the external system 300 is a system of electronic devices that need to be equipped with the fingerprint recognition module 100 of the present application, such as a wearable device. In some embodiments, the master chip 102a realizes the image acquisition control of each slave chip 102b through the control bus, and each slave chip 102b transmits data to the master chip or system through the data bus according to the communication protocol. The control bus and the data bus can exist independently or in common. For example, SPI (Serial Peripheral Interface) can be used to transmit data and control information.

[0069] In one embodiment, reference Figure 3 , the master chip 102a can be connected to each slave chip 102b through the data bus 104. The communication protocol between the master chip 102a and the external system 300 can be the same communication protocol as that between the master chip 102a and the slave chip 102b, or different communication protocols can be used. The master chip 102a and the slave chip 102b can be chips with different structures; in order to simplify the supply chain, they can also be chips with the same structure. In the latter case, the master-slave mode of the master chip 102a and the slave chip 102b is configured by registers.

[0070] In one embodiment, an event monitoring module (not shown in the figure) is provided in the master chip 102a and / or the slave chip 102b. The event monitoring module is used to issue an interrupt signal when a specific event is detected. The master chip 102a is also used to wake up the master chip and the sensor pixels and control circuits in the slave chip that are in a turned-off or dormant state based on the interrupt signal issued by the event monitoring module to reduce standby power consumption.

[0071] In a specific embodiment, when an event monitoring module is set in the main chip 102a, the event monitoring module includes some normally-on pixels in the main chip 102a. When the some normally-on pixels detect that a finger contacts the outer surface of the curved cover, the event monitoring module sends an interrupt signal. The main chip 102a wakes up other pixels in the main chip and sensor pixels and control circuits in the slave chip 102b based on the interrupt signal sent by the event monitoring module.

[0072] In other embodiments, the plurality of fingerprint recognition chips are all slave chips, and the fingerprint recognition module 100 further includes a master chip connected to the plurality of fingerprint recognition chips, the master chip only includes a control circuit but does not include a sensor pixel array, and the master chip is used to control the slave chips, coordinate the timing of image acquisition and inter-chip communication, and uniformly transmit data to an external system. The master chip can be specifically integrated into the back side or other areas of the flexible printed circuit board 104.

[0073] In one embodiment, other required chips, passive devices, connectors, structural parts and other components are integrated in the area of ​​the fingerprint recognition module 100 outside the fingerprint recognition chip 102 .

[0074] In one embodiment, after the fingerprint image is obtained by the fingerprint recognition module 100 of the present invention, the fingerprint images obtained by each fingerprint recognition chip are spliced ​​to obtain a complete fingerprint image; subsequently, the obtained complete fingerprint image can be entered as a template.

[0075] In another embodiment, after the fingerprint image is obtained by the fingerprint recognition module 100 of the present invention, the fingerprint image obtained by each fingerprint recognition chip is respectively recorded as a template.

[0076] refer to Figure 4 and Figure 5 The present invention further provides a wearable device 200, comprising:

[0077] The fingerprint recognition module 100 described above is used to obtain the user's fingerprint image;

[0078] The matching module (not shown in the figure) is used to match the acquired fingerprint image with the stored target fingerprint. If they match, the fingerprint recognition is successful, and the wearable device can be controlled to unlock or issue a specific instruction.

[0079] In this embodiment, the wearable device 200 has a convex or concave side surface, and the fingerprint recognition module 100 is arranged on the side surface of the wearable device 200 and is adapted to the curved surface of the side surface of the wearable device 200, which ensures the beautiful appearance of the wearable device while ensuring that the fingerprint recognition has high accuracy and security. In addition, the volume occupied by the fingerprint recognition module of the present application is also small.

[0080] The wearable device may be a smart watch or a smart bracelet. The wearable device may also be other electronic devices.

[0081] The specific instruction may be an instruction to unlock a certain application program. The specific instruction may also include an operation instruction such as sliding up and down, sliding left and right, turning pages up and down, upper and lower menus, long press, short press or double click.

[0082] In one embodiment, reference Figure 4 When the wearable device 200 has a convex side 202, the fingerprint recognition module 100 having a convex outer surface is arranged on the convex side 202 of the wearable device 200 or embedded in the convex side 202, and the curvature of the convex outer surface of the curved cover plate in the fingerprint recognition module 100 matches the curvature of the convex side 202 of the wearable device 200 (matching means that the curvatures of the two are the same or have a small difference).

[0083] In another embodiment, reference Figure 5 When the wearable device 200 has a concave side 202, the fingerprint recognition module 100 having a concave outer surface is arranged on the concave side 202 of the wearable device 200 or embedded in the concave side 202, and the curvature of the concave outer surface of the curved cover plate in the fingerprint recognition module 100 matches the curvature of the concave side 202 of the wearable device (matching means that the curvatures of the two are the same, basically the same, or have a small difference).

[0084] Figure 4 or Figure 5 In the embodiment, when the wearable device is a smart watch, the dial of the smart watch has a convex or concave side 202, and the fingerprint recognition module is arranged on the side 202 of the dial of the watch and is adapted to the curved surface of the side of the dial of the watch.

[0085] The chip length of the fingerprint recognition chip in the fingerprint recognition module 100 satisfies:

[0086] L = 2*{[(R-0.1) 2 -(Rl max ) 2 ] 1 / 2};

[0087] Where R is the radius of curvature of the surface, which is the dial diameter for smart watches, L is the length of the chip, and l max It is the maximum sensing distance of the chip.

[0088] In one embodiment, when the diameter of the dial is greater than 40 mm, the size design (length) of the fingerprint recognition chip is less than 3 mm, and the thickness of the bonding wire in the fingerprint recognition module 100 (the straight-line distance between the center of the fingerprint recognition chip 102 and the inner surface 11b of the curved cover plate 101) can be controlled within a range of about 60 mm or less. When the width of the fingerprint recognition chip sensing surface is also 3 mm, the fingerprint recognition module 100 composed of three fingerprint recognition chips 102 can achieve an effective recognition area greater than 25 mm. 2 , meeting the security and performance requirements of fingerprint recognition.

[0089] An embodiment of the present invention also provides a fingerprint recognition method, referring to Figure 6 ,include:

[0090] Step S401, obtaining a fingerprint image of a user through a plurality of fingerprint recognition chips in the aforementioned fingerprint recognition module;

[0091] Step S402, stitching the fingerprint images acquired by each fingerprint recognition chip to obtain a complete fingerprint image;

[0092] Step S403, inputting the obtained complete fingerprint image as a template;

[0093] Step S404: after input, the obtained complete fingerprint image is matched with the stored target fingerprint to obtain a matching result.

[0094] In one embodiment, the stitching includes filling the gaps between adjacent fingerprint recognition chips by using a curvature driven diffusion or a texture feature diffusion algorithm to obtain a complete fingerprint image.

[0095] Texture feature diffusion is to advance from known pixels to unknown pixels layer by layer, and use the known pixel values ​​of the pixel neighborhood to weightedly fill the unknown area. The closer the pixel is to the normal direction, the greater its weight. Curvature-driven diffusion uses the Laplace operator to estimate the smoothness information of the unknown image part, uses the edge of the known part as a constraint, and constructs a differential equation to solve the unknown pixel value.

[0096] Another embodiment of the present invention further provides a fingerprint recognition method, referring to Figure 7 ,include:

[0097] Step S501, obtaining a fingerprint image of a user through a plurality of fingerprint recognition chips in the aforementioned fingerprint recognition module;

[0098] Step S502, entering the fingerprint images acquired by each fingerprint recognition chip as templates;

[0099] Step S503, after the input, the fingerprint image acquired by each fingerprint recognition chip is matched with the corresponding stored target fingerprint to obtain a matching result.

[0100] In one embodiment, the method further includes: performing weighted statistics on the matching results. In a specific embodiment, weighting is performed according to the quality of the fingerprint image obtained by each fingerprint recognition chip.

[0101] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A fingerprint recognition module, characterized in that: include: A curved cover plate, the curved cover plate comprising an outer surface that is convex or concave and an inner surface that is parallel to and opposite to the outer surface, and the curved cover plate is curved or elongated; A plurality of interconnected fingerprint recognition chips located on the inner surface of the curved cover plate, the plurality of fingerprint recognition chips are interconnected through a flexible printed circuit board, the plurality of fingerprint recognition chips include a master chip and at least one slave chip connected to the master chip, the master chip includes a sensor pixel array and corresponding reading and control circuits, the slave chip includes a sensor pixel array and corresponding reading and control circuits, the master chip and the slave chip are both used to collect fingerprint images when a finger contacts the outer surface of the curved cover plate, the master chip is also used to control the slave chip, coordinate the image collection timing and inter-chip communication, and uniformly transmit the data to an external system, the master chip and / or the slave chip are provided with an event monitoring module, the event monitoring module is used to send an interrupt signal when a specific event is detected, and the master chip is also used to wake up the sensor pixels and control circuits in the master chip and the slave chip that are in a closed or dormant state based on the interrupt signal sent by the event monitoring module.

2. The fingerprint recognition module according to claim 1, characterized in that: When an event monitoring module is set in the main chip, the event monitoring module includes some normally-on pixels in the main chip. When the some normally-on pixels detect that a finger touches the outer surface of the curved cover plate, the event monitoring module sends an interrupt signal. The main chip wakes up other pixels in the main chip and sensor pixels and control circuits in the slave chip based on the interrupt signal sent by the event monitoring module.

3. The fingerprint recognition module according to claim 1, characterized in that: The several fingerprint recognition chips are all slave chips, and also include a master chip connected to the several fingerprint recognition chips. The master chip is used to control the slave chips, coordinate the image acquisition timing and inter-chip communication, and uniformly transmit the data to the external system.

4. The fingerprint recognition module according to claim 1, characterized in that: The plurality of fingerprint identification chips are bonded to the inner surface of the curved cover plate by adhesive or plastic packaging material.

5. According to the fingerprint recognition module of claim 4, the side surfaces of the plurality of fingerprint recognition chips and the gaps between the plurality of fingerprint recognition chips are filled with adhesive or plastic packaging material.

6. The fingerprint recognition module according to claim 1, characterized in that: The fingerprint recognition chip performs fingerprint detection based on the principles of capacitance, optics or ultrasound.

7. The fingerprint recognition module according to claim 1, characterized in that: The plurality of fingerprint recognition chips are packaged in the form of LGA, BGA or CSP; or, the plurality of fingerprint recognition chips are bare chips, and the plurality of fingerprint recognition chips are interconnected with a flexible printed circuit board in the form of COB.

8. A wearable device, characterized in that: include: The fingerprint recognition module according to any one of claims 1 to 7, wherein the fingerprint recognition module is used to obtain a fingerprint image of a user; The matching module is used to match the acquired fingerprint image with the stored target fingerprint, and if they match, control the wearable device to unlock or issue a specific instruction.

9. The wearable device according to claim 8, characterized in that: The wearable device has a convex or concave side surface, and the fingerprint recognition module is arranged on the side surface of the wearable device and adapts to the curved surface of the side surface of the wearable device.

10. The wearable device according to claim 9, characterized in that: When the wearable device has a convex side, a fingerprint recognition module having a convex outer surface is arranged on the convex side of the wearable device or embedded in the convex side, and the curvature of the convex outer surface of the curved cover plate in the fingerprint recognition module matches the curvature of the convex side of the wearable device.

11. The wearable device according to claim 9, characterized in that: When the wearable device has a concave side, a fingerprint recognition module having a concave outer surface is arranged on the concave side of the wearable device or embedded in the convex side, and the curvature of the concave outer surface of the curved cover plate in the fingerprint recognition module matches the curvature of the concave side of the wearable device.

12. The wearable device according to claim 9, characterized in that: The wearable device includes a smart watch or a smart bracelet.

13. The wearable device according to claim 12, characterized in that: When the wearable device is a smart watch, the dial of the smart watch has a convex or concave side, and the fingerprint recognition module is arranged on the side of the dial of the watch and adapts to the curved surface of the side of the dial of the watch.

14. A fingerprint recognition method, characterized in that: include: Acquiring a user's fingerprint image through a plurality of fingerprint recognition chips in the fingerprint recognition module according to any one of claims 1 to 7; The fingerprint images acquired by each fingerprint recognition chip are stitched together to obtain a complete fingerprint image; Entering the obtained complete fingerprint image as a template; After entry, the obtained complete fingerprint image is matched with the stored target fingerprint to obtain a matching result.

15. The fingerprint recognition method according to claim 14, characterized in that: The stitching includes filling the gaps between adjacent fingerprint recognition chips by using a curvature driven diffusion or a texture feature diffusion algorithm.

16. A fingerprint recognition method, characterized in that: include: Acquiring a user's fingerprint image through a plurality of fingerprint recognition chips in the fingerprint recognition module according to any one of claims 1 to 7; The fingerprint images obtained by each fingerprint recognition chip are respectively entered as templates; After entry, the fingerprint image acquired by each fingerprint recognition chip is matched with the corresponding stored target fingerprint to obtain a matching result.

17. The fingerprint recognition method according to claim 16, characterized in that: Perform weighted statistics on the matching results.

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