Optical fingerprint recognition module and apparatus, and electronic device

Abstract

Provided in the embodiments of the present application are an optical fingerprint recognition module and apparatus, and an electronic device. The optical fingerprint recognition module is arranged on a first printed circuit board under a cover plate, and an upper surface of the cover plate is provided with a fingerprint imaging region. The optical fingerprint recognition module comprises: an optical lens, which is arranged under the cover plate and corresponds to the fingerprint imaging region, wherein the optical lens is used for converging fingerprint detection signals, which are formed by means of a through hole of a light guide element, the light guide element is used for making light, which is emitted by a light source, uniformly irradiate onto a human finger in the fingerprint imaging area after the light is scattered, and making the light reflected by the human finger to form reflected light, and the reflected light is transmitted through the cover plate in the fingerprint imaging region, and forms the fingerprint detection signals by means of the through hole; and an optical sensor, which is arranged on the first printed circuit board and is located under the optical lens, wherein the optical sensor is used for receiving the fingerprint detection signals converged by the optical lens, and the fingerprint detection signals are used for detecting fingerprint information of the human finger.

Description

Optical fingerprint recognition module, device and electronic equipment

[0001] This application claims priority to the invention application with application date of September 13, 2023, application number "202311182904.6", and patent name "An optical fingerprint recognition module, device and electronic device", all contents of which are hereby incorporated by reference. Technical Field

[0002] The embodiments of the present application relate to the field of fingerprint recognition technology, and in particular to an optical fingerprint recognition module, device, and electronic device. Background Art

[0003] With the development of optical under-screen fingerprint recognition technology, it is widely used in terminal devices such as smartphones. However, for other fingerprint recognition electronic devices such as door locks and car locks that do not have OLED backlights, the optical under-screen fingerprint recognition solutions used by terminals such as smartphones cannot be directly adopted.

[0004] Therefore, how to realize fingerprint recognition in fingerprint recognition electronic devices without OLED backlight has become a technical problem that needs to be solved urgently.

[0005] Summary of the Invention

[0006] In view of this, one of the technical problems solved by the embodiments of the present application is to provide an optical fingerprint recognition module, device and electronic device, which realize fingerprint recognition in a fingerprint recognition electronic device without an OLED backlight.

[0007] In a first aspect, an optical fingerprint recognition module is provided, which is arranged on a first printed circuit board below a cover plate, and the upper surface of the cover plate has a fingerprint imaging area. The optical fingerprint recognition module includes: an optical lens, which is arranged below the cover plate and corresponds to the fingerprint imaging area, the optical lens is used to converge the fingerprint detection signal formed by the through hole of the light guide element, the light guide element is used to make the light emitted by the light source uniformly irradiate the human finger in the fingerprint imaging area after scattering, and form reflected light after reflection by the human finger, the reflected light passes through the cover plate of the fingerprint imaging area, and passes through the through hole to form the fingerprint detection signal; an optical sensor, which is arranged on the first printed circuit board and located below the optical lens, the optical sensor is used to receive the fingerprint detection signal converged by the optical lens, and the fingerprint detection signal is used to detect the fingerprint information of the human finger.

[0008] In a second aspect, an optical fingerprint recognition device is provided, which is arranged under a cover plate, and the upper surface of the cover plate has a fingerprint imaging area. The optical fingerprint recognition device includes: a light guide element and the optical fingerprint recognition module described in the first aspect.

[0009] In a second aspect, an electronic device is provided, comprising: a cover plate and the optical fingerprint recognition device according to the second aspect, wherein the optical fingerprint recognition device is arranged under the cover plate to realize fingerprint information detection of human fingers.

[0010] In the embodiment of the present application, the optical fingerprint recognition module is arranged on the first printed circuit board below the cover plate, and the upper surface of the cover plate has a fingerprint imaging area. The light guide element causes the light emitted by the light source to be scattered and evenly illuminated to the human finger in the fingerprint imaging area, and is reflected by the human finger to form reflected light. The reflected light passes through the cover plate in the fingerprint imaging area and passes through the through hole to form a fingerprint detection signal. The optical lens of the optical fingerprint recognition module converges the fingerprint detection signal formed by the through hole of the light guide element and sends it to the optical sensor to detect the fingerprint information of the human finger. Therefore, the embodiment of the present application uses the light guide element to evenly process the light emitted by the light source, avoiding the problems of bright lines and inverted colors in the fingerprint image caused by uneven light irradiation on the human finger, and also avoids the problem of large fluctuations and unevenness of the fingerprint detection signal caused by the influence of the finger pressing direction, force, and position. The embodiment of the present application does not need to set a light shielding member, has a high utilization rate of the light source, reduces the power consumption of the electronic equipment used and the time consumption of fingerprint recognition, has low requirements for the installation accuracy of the light source, and has low requirements for the consistency of the light source used. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0012] Figure 1 is a schematic diagram of the fingerprint recognition module structure of the OLED backlight;

[0013] Figure 2 is a schematic diagram of the LCD fingerprint recognition module structure;

[0014] FIG3 is a schematic structural diagram of a fingerprint recognition module in a fingerprint recognition electronic device without an OLED backlight;

[0015] FIG4 is a schematic diagram showing a bright line generated at the junction of valleys and ridges in a fingerprint image;

[0016] FIG5 is a schematic diagram of a fingerprint image affected by the direction, position, and force of finger pressing;

[0017] FIG6 is a schematic diagram of a fingerprint image with different shielding areas of a light shielding member;

[0018] FIG7 is a schematic diagram of the structure of an optical fingerprint recognition module according to an embodiment of the present application;

[0019] FIG8 is a schematic diagram of the field of view of an optical fingerprint recognition module;

[0020] FIG9 is a schematic diagram of the minimum opening of an optical fingerprint recognition module according to an embodiment of the present application;

[0021] FIG10 is a schematic diagram of a fingerprint imaging area in a rectangular shape according to an embodiment of the present application;

[0022] FIG11 is a schematic diagram showing an embodiment of the present application in which the optical lens is arranged at a height lower than the height of the lower opening;

[0023] FIG12 is a schematic diagram showing an embodiment of the present application in which the optical lens is arranged at a height equal to the height of the lower opening;

[0024] FIG13 is a schematic diagram showing an embodiment of the present application in which the optical lens is arranged at a height higher than the lower opening;

[0025] FIG14 is a schematic diagram of the installation position and illumination direction of a light source according to an embodiment of the present application;

[0026] FIG15 is a schematic diagram of the installation position and illumination direction of a light source according to another embodiment of the present application;

[0027] FIG16 is a schematic diagram of the installation position and illumination direction of a light source according to yet another embodiment of the present application;

[0028] FIG17 is a schematic diagram of the installation position and illumination direction of a light source according to yet another embodiment of the present application;

[0029] FIG18 is a schematic diagram of the installation position and illumination direction of a light source according to yet another embodiment of the present application;

[0030] FIG19 is a top view schematically illustrating a light source arrangement according to an embodiment of the present application;

[0031] FIG20 is a top view schematically showing a light source arrangement according to another embodiment of the present application;

[0032] FIG21 is a schematic diagram of the structure of an optical fingerprint recognition module according to yet another embodiment of the present application;

[0033] FIG22 is a schematic diagram of the structure of an optical fingerprint recognition device provided in one embodiment of the present application;

[0034] FIG23 is a schematic diagram of an electronic device provided in accordance with another embodiment of the present application. DETAILED DESCRIPTION

[0035] The specific implementation of the embodiment of the present invention is further described below with reference to the accompanying drawings of the embodiment of the present invention.

[0036] The embodiments of the present application can be applied to any fingerprint recognition electronic device without an OLED backlight source, such as door locks, car locks (or other vehicle-mounted electronic devices).

[0037] Figure 1 is a schematic diagram of the fingerprint recognition module structure of the OLED backlight source, and Figure 2 is a schematic diagram of the fingerprint recognition module structure of the LCD.

[0038] Referring to Figure 1, the self-luminous light of the OLED screen pixels is used as the light source. The light is irradiated onto the finger, reflected by the finger, passes through the mobile phone screen 11 and the optical lens 12, and is received by the optical sensor 13 under the screen to realize fingerprint image collection and fingerprint recognition.

[0039] Referring to Figure 2, the LCD fingerprint recognition module requires an LED light source 24 to be placed on the side to shine light in the direction of the finger. After the light is scattered by the finger, some of the light will pass through the cover 21 and be focused by the optical lens 22 into the optical sensor 23 to achieve fingerprint image acquisition and fingerprint recognition.

[0040] FIG3 is a schematic structural diagram of a fingerprint recognition module in a fingerprint recognition electronic device without an OLED backlight source.

[0041] Referring to FIG3 , an LED light source 34 is used to illuminate a human finger in a non-fingerprint imaging area. The light is scattered by the human finger and then reflected by the human finger in the fingerprint imaging area to form reflected light. The reflected light passes through the cover plate 31 and is received by the optical fingerprint recognition module 32 to achieve fingerprint image acquisition and fingerprint recognition. Because the light from the light source 33 to the human finger in the non-fingerprint imaging area is uneven, anomalies may occur in the fingerprint image. For example, if the signal intensity of the fingerprint image closer to the light source is too strong, increasing the signal intensity at the high beam end will cause saturation of the signal intensity at the low beam end, resulting in a lower overall adjustable dynamic range of the fingerprint image. Furthermore, referring to FIG4 , because the light from the light source 34 to the human finger in the non-fingerprint imaging area is uneven, bright lines will appear at the junction of valleys and ridges in the fingerprint image, causing the lines to be inverted, affecting the fingerprint recognition rate.

[0042] Because the light from the light source to the non-fingerprint imaging area is uneven, the light from the light source to the non-fingerprint imaging area is affected by the direction, position, and force of the finger pressing, resulting in a small amount of light from the light source to the non-fingerprint imaging area, resulting in a low fingerprint image recognition rate. For example, in some pressing postures, the light from the light source to the non-fingerprint imaging area is very small, resulting in poor fingerprint image quality, as shown in Figure 5.

[0043] Furthermore, the above-mentioned technical solution strives to prevent light source 33 from directly irradiating the fingerprint imaging area, thereby preventing strong reflected light from interfering with light scattered from the human finger. A light shield 34 is typically provided to block light from light source 33 directly irradiating the fingerprint imaging area, thereby preventing the strong reflected light generated by light source 33 directly irradiating the fingerprint imaging area. However, using light shield 34 to partially block the light from the light source reduces light source utilization, increases power consumption and exposure time, and thus increases fingerprint recognition time.

[0044] If multiple light sources are used, even slightly different areas of shielding by the light shielding member for each light source, or even significant differences between the light sources themselves, can cause uneven brightness in the fingerprint image, affecting recognition efficiency. See Figure 6 , which illustrates the uneven brightness of the fingerprint image caused by differences in the shielding area of ​​the light shielding member 34. Therefore, the above technical solution requires high precision in the installation of the light shielding member 34 and light source 33, as well as high consistency in the light sources 33 used.

[0045] In order to overcome the above technical defects, the optical fingerprint recognition module of the embodiment of the present application is arranged under the cover plate, and the upper surface of the cover plate has a fingerprint imaging area. The light guide element causes the light emitted by the light source to be scattered and evenly illuminated to the human finger in the fingerprint imaging area, and is reflected by the human finger to form reflected light. The reflected light passes through the cover plate in the fingerprint imaging area and passes through the through hole to form a fingerprint detection signal. The optical lens of the optical fingerprint recognition module converges the fingerprint detection signal formed by the through hole of the light guide element and sends it to the optical sensor to detect the fingerprint information of the human finger. The embodiment of the present application uses a light guide element to evenly process the light emitted by the light source, avoiding problems such as bright lines and inverted colors in the fingerprint image caused by uneven light irradiating the human finger, and also avoids the problem of large fluctuations and unevenness in the fingerprint detection signal caused by the influence of the finger pressing direction, force, and position. The embodiment of the present application does not need to set a light shielding member, has a high utilization rate of the light source, reduces the power consumption of the electronic equipment used and the time consumption of fingerprint recognition, has low requirements for the installation accuracy of the light source, and has low requirements for the consistency of the light source used.

[0046] 7 , an embodiment of the present application provides an optical fingerprint recognition module 7 , which is disposed below a cover plate 6 , and an upper surface of the cover plate 6 has a fingerprint imaging area 61 .

[0047] Specifically, the cover plate 6 can be made of glass, acrylic, or other light-transmitting materials. For ease of description, the present embodiment of the present application takes glass as an example for description.

[0048] The optical fingerprint recognition module 7 includes an optical lens 71 and an optical sensor 72 .

[0049] The optical lens 71 is arranged below the glass cover 6 and corresponds to the fingerprint imaging area 61. The optical lens 71 is used to converge the fingerprint detection signal formed by the through hole 51 of the light guide element 5. The light guide element 5 is used to scatter the light emitted by the light source 4 and evenly illuminate the human finger. The light is reflected by the human finger to form reflected light. The reflected light passes through the cover of the fingerprint imaging area 61 and passes through the through hole 51 to form a fingerprint detection signal.

[0050] The optical sensor 72 is disposed on the first printed circuit board and is located below the optical lens 71. The optical sensor 72 is used to receive the fingerprint detection signal gathered by the optical lens 71. The fingerprint detection signal is used to detect fingerprint information of a human finger.

[0051] The embodiment of the present application utilizes a light-guiding element 5 to homogenize the light emitted by the light source 4, thereby avoiding problems such as bright lines and inverted colors in the fingerprint image caused by uneven light irradiation on the human finger. It also avoids the problem of large fluctuations and unevenness in the fingerprint detection signal caused by the influence of the direction, force, and position of the finger pressing. The embodiment of the present application does not require the provision of a light shielding member, thus achieving high utilization of the light source 4 and reducing the power consumption of the electronic device used and the time required for fingerprint recognition.

[0052] In some specific implementations of the embodiments of the present application, in order to make the light irradiated to the human finger more uniform, the material of the light guide element 5 may include: a light-transmitting material with scattering properties.

[0053] Specifically, the material of the light guide element 5 may include: plastic, such as ABS (acrylonitrile-butadiene-styrene copolymer), PC (polycarbonate), PLA (polylactic acid) and the like.

[0054] Those skilled in the art can select the above materials to manufacture the light guide element 5 according to their needs, thereby making the manufacturing method of the light guide element 5 simpler.

[0055] In some specific implementations of the embodiments of the present application, in order to further improve the uniformity of the light irradiating the human finger, a material with enhanced scattering performance is added to the material of the light guide element 5.

[0056] Specifically, scattering particles are added to the light guide element 5 to further improve the uniformity of the light irradiating the human finger.

[0057] In some specific implementations of the embodiments of the present application, referring to Figure 7, the through hole 51 includes an upper opening 511 and a lower opening 512, the upper opening 511 is an opening close to the glass cover 6, and the lower opening 512 is an opening close to the optical fingerprint recognition module 7. The upper opening 511 and the lower opening 512 are connected to form a passage of the through hole 51, and the passage of the through hole 51 is greater than or equal to the field of view angle area of ​​the optical fingerprint recognition module 7.

[0058] Referring to Figure 8, the size of the field of view (FOV) of the optical fingerprint recognition module 7 determines the field of view of the optical fingerprint recognition module 7, that is, the angle formed by the edges of the maximum range of the optical lens that the fingerprint of the human finger under test can pass through, with the optical lens 71 of the optical fingerprint recognition module 7 as the vertex, is called the field of view. It is divided into HFOV (horizontal FOV, the angle formed by the horizontal edge), VFOV (vertical FOV, the angle formed by the vertical edge), and DFOV (diagonal FOV, the angle formed by the focus edge). The field of view angle area of ​​the optical fingerprint recognition module 7 is a conical area formed by the edges of the field of view angle (the dotted line with 71 as the vertex) with 71 as the vertex in Figure 8.

[0059] Referring back to Figure 7 , the reflected light from the human finger passes through the glass cover 6 in the fingerprint imaging area 61 and through the through-hole 51 of the light guide element 5, generating a fingerprint detection signal. The through-hole formed by the connection between the upper opening 511 and the lower opening 512 is greater than or equal to the field of view of the optical fingerprint recognition module 7, thereby preventing light entering the optical fingerprint recognition module 7 from being blocked or scattered by the light guide element 5 within the field of view.

[0060] Specifically, the upper opening 511 in the embodiment of the present application may be circular, rectangular or other polygonal.

[0061] 9 , if the upper opening 511 is circular, the diameter of the upper opening 511 is greater than or equal to the minimum opening diameter L2. The minimum opening diameter L2 is calculated as shown in Formula 1:

[0062] 10, the above formula takes the fingerprint imaging area 61 as an example of a rectangle, w1 is the width of the fingerprint imaging area 61, h1 is the height of the fingerprint imaging area 61, according to The length of the diagonal line of the rectangle corresponding to the fingerprint imaging area 61 is calculated to be L1. If the fingerprint imaging area 61 is a circle, the diameter of the circle corresponding to the fingerprint imaging area 61 is L1.

[0063] Wherein, d is the thickness of the glass cover 6 , α is the diagonal field angle of the optical fingerprint recognition module 7 , and n is the refractive index of air relative to the glass cover 6 .

[0064] See Figure 9, using Calculate ΔL, and then calculate L1-2*ΔL to get the minimum opening diameter L2.

[0065] In addition, if the upper opening 511 is a rectangle, the width of the upper opening 511 is greater than or equal to the minimum opening width w2, and the height of the upper opening is greater than or equal to the minimum opening height h2, wherein the calculation method of the minimum opening width w2 is as shown in Formula 2, and the calculation method of the minimum opening height h2 is as shown in Formula 3.

[0066] Formula 2 is:

[0067] Formula 3 is:

[0068] Wherein w2 is the minimum opening width, h2 is the minimum opening height, the diameter L2 of the minimum opening is obtained according to Formula 1, w1 is the width of the fingerprint imaging area 61, and h1 is the height of the fingerprint imaging area 61.

[0069] If the upper opening 511 is a polygon, the length of each side of the polygon can be obtained by a person skilled in the art using a mathematical algorithm based on the minimum opening diameter L2, so it will not be described in detail here.

[0070] Therefore, in the embodiment of the present application, the minimum opening diameter L2 of the upper opening 511 can be obtained based on the fingerprint imaging area 61, the thickness of the cover plate 6, the refractive index of air relative to the cover plate, and the diagonal field of view angle of the optical fingerprint recognition module 7, so that the diameter L1 of the upper opening 511 is greater than or equal to the minimum opening diameter L2, avoiding blocking the field of view angle area, so that the fingerprint recognition module 7 can receive more light from the fingerprint imaging area 61.

[0071] Specifically, the lower opening 512 in the embodiment of the present application may be circular, rectangular or other polygonal.

[0072] 9 , the lower opening 512 is clearance-matched with the optical lens 71 , and the lower opening 512 allows the fingerprint detection signal passing through the lower opening 512 to be focused onto the optical lens 71 .

[0073] A clearance fit refers to a fit with a gap (including a minimum gap equal to zero), that is, the size of the lower opening 512 is as close as possible to that of the optical lens 71. Since the lower opening 512 is larger than the size of the optical lens 71, part of the fingerprint detection signal cannot be focused on the center of the optical lens 71, thereby weakening the fingerprint detection signal focused on the center of the optical lens 71; if the lower opening 512 is smaller than the size of the optical lens 71, the fingerprint detection signal will be blocked. Therefore, the size of the lower opening 512 is made as close as possible to that of the optical lens 71. The lower opening 512 allows the fingerprint detection signal passing through the lower opening 512 to be focused on the optical lens 71, thereby improving the quality of the fingerprint image.

[0074] 11 to 13 , the optical lens 71 is disposed at a height lower than, equal to, or higher than the height of the lower opening 512 .

[0075] 11 , the optical lens 71 is arranged at a height lower than the lower opening 512 , which may cause the lower opening 512 to block part of the fingerprint detection signal, thereby affecting the quality of the fingerprint image.

[0076] 12 , the height of the optical lens 71 is set equal to the height of the lower opening 512 , which helps to reduce the size of the lower opening 512 and avoid the weakening of the fingerprint detection signal at the center of the optical lens 71 caused by the lower opening 512 .

[0077] 13 , the optical lens 71 is arranged at a height higher than the lower opening 512 to prevent the reflected light from the fingerprint imaging area 61 from being blocked by the lower opening 512 within the field of view of the optical fingerprint recognition module 7 .

[0078] In some specific implementations of the embodiments of the present application, the setting position and lighting direction of the light source are shown in Figures 7 and 14 to 18.

[0079] 14 , the light source 4 is disposed on the first printed circuit board and is located below the light guide element 5 , and the light direction of the light source 4 is toward the fingerprint imaging area 61 .

[0080] In the embodiment of the present application, the light from the light source 4 is scattered as much as possible by the light guide element 5 and evenly illuminates the human finger in the fingerprint imaging area 61 .

[0081] Since there is no supporting component between the light guide element 5 and the first printed circuit board in the embodiment of the present application, the light guide element 5 needs to be provided with an additional supporting portion or an adhesive layer to support and fix it to the first printed circuit board.

[0082] Referring to Figure 7, the light-guiding element 5 includes a main body 52 and support columns 53 respectively arranged at both ends of the main body 52. ​​The support columns 53 are used to support the main body 52 and form a cavity between the main body 52 and the first printed circuit board. The through hole 51 is arranged on the main body 52, and the optical fingerprint recognition module 7 is arranged on the first printed circuit board in the cavity and corresponds to the position of the through hole 51.

[0083] In the embodiment of the present application, the light guide element 5 is supported and fixed to the first printed circuit board by the support column 53 , and the light guide element 5 does not need to be provided with an additional support portion or adhesive layer.

[0084] Specifically, the light guide element 5 in the embodiment of the present application can be manufactured by integral molding, which reduces the process difficulty and manufacturing cost.

[0085] 15 , the light source 4 is disposed on the side outer surface of the light guide element 5 , and the light direction of the light source 4 is toward the fingerprint imaging area 61 .

[0086] In this embodiment of the present application, light source 4 is mounted on the lateral outer surface of light guide element 5 instead of on the first printed circuit board. By aligning the illumination direction of light source 4 toward fingerprint imaging area 61, light from light source 4 is scattered as much as possible by light guide element 5, evenly illuminating the human finger in fingerprint imaging area 61. This embodiment of the present application simplifies the installation of light guide element 5 and light source 4, and minimizes the impact on the first printed circuit board and optical fingerprint recognition module 7.

[0087] 16 , the light source 4 is disposed on the first printed circuit board and is located on the side of the light guide element 5 . The light source 4 directs light toward the cover plate, and part of the light emitted by the light source 4 is directed toward the fingerprint imaging area.

[0088] In the embodiment of the present application, the light source 4 is located on the side of the light guide element 5, the light direction of the light source 4 is toward the cover plate 6, part of the light emitted by the light source 4 is toward the fingerprint imaging area 61, and part of the light emitted by the light source 4 is evenly irradiated to the human finger in the fingerprint imaging area 61.

[0089] 17 , the light source 4 is disposed on the inner side surface of the light guide element 5 , and the light direction of the light source 4 is toward the fingerprint imaging area 61 .

[0090] Specifically, the light source 4 is attached to the inner side surface of the light guide element 5 via an adhesive layer. The adhesive layer can be a second printed circuit board 41. For ease of installation, the second printed circuit board is a flexible printed circuit board.

[0091] In this embodiment, light source 4 is mounted on the inner side surface of light guide element 5 instead of on the first printed circuit board. By aligning the illumination direction of light source 4 toward fingerprint imaging area 61, light from light source 4 is scattered as much as possible by light guide element 5, evenly illuminating the human finger in fingerprint imaging area 61. This embodiment simplifies the installation of light guide element 5 and light source 4, minimizing the impact on the first printed circuit board and optical fingerprint recognition module 7.

[0092] Referring to Figure 18, the light source 4 is arranged on the first printed circuit board and is located on the side of the light guide element 5. The light direction of the light source 4 is toward the cover plate 6. A reflective mirror 62 is provided on the cover plate 6, so that the light emitted by the light source 4 passes through the reflective mirror 62 and is directed toward the fingerprint imaging area 61.

[0093] Specifically, the reflective mirror 62 is supported by a reflective mirror bracket 63 .

[0094] In the embodiment of the present application, the light source 4 is directed toward the fingerprint imaging area 61 by the reflective mirror 62 , so that the light from the light source 4 is scattered as much as possible by the light guide element 5 and evenly illuminates the human finger in the fingerprint imaging area 61 .

[0095] In some specific implementations of the embodiments of the present application, referring to FIG19 , the light source 4 is symmetrically arranged around the optical fingerprint recognition module 7. The wavelength of the light source 4 is not limited. One embodiment uses an 850nm or 940nm infrared light source. The number and installation position of the light source 4 are not limited. One embodiment uses four LEDs dispersedly arranged around the optical fingerprint recognition module 7. It can be understood that since the optical lens 71 of the fingerprint recognition module 7 is arranged corresponding to the fingerprint imaging area 61, as shown in FIG19 , in the top view, the light source 4 is symmetrically arranged around the fingerprint imaging area 61.

[0096] Referring to FIG. 20 , in order to obtain a more uniform fingerprint detection signal, eight LEDs may be dispersedly arranged around the optical fingerprint recognition module 7 .

[0097] In some specific implementations of the present application, as shown in FIG21 , a filter 73 is further provided on the upper surface of the optical sensor 72 to filter the fingerprint detection signal and improve the accuracy of fingerprint recognition and detection. In some optional implementations, the filter 73 can be integrated with the optical sensor 72, for example, by coating the upper surface of the optical sensor 72 with a film layer.

[0098] 7 , 9 and 21 , the optical fingerprint recognition module 7 further includes a peripheral light-shielding shell 74 disposed around the optical lens 71 and the optical sensor 72 . The peripheral light-shielding shell 74 is used to block light from reaching the optical sensor 72 .

[0099] Specifically, the optical lens 71, the optical sensor 72, and the peripheral light shielding housing 74 constitute a camera, and the peripheral light shielding housing 74 blocks the light source or the light that does not pass through the optical lens 71 from directly irradiating the optical sensor 72. The peripheral light shielding housing 74 is made of a light-shielding black material to achieve a better light-shielding effect.

[0100] 22 , an embodiment of the present application further provides an optical fingerprint recognition device 2. The optical fingerprint recognition device 2 is disposed below a cover plate 6 , the upper surface of which has a fingerprint imaging area 61 . The optical fingerprint recognition device 2 includes a light guide element 5 and the optical fingerprint recognition module 7 of any of the above embodiments.

[0101] 23 , another embodiment of the present application further provides an electronic device, comprising: a cover plate 6 and the optical fingerprint recognition device 2 in the above embodiment, wherein the optical fingerprint recognition device 2 is disposed under the cover plate 6 to detect fingerprint information of a human finger.

[0102] The electronic devices of the embodiments of the present application include, but are not limited to:

[0103] (1) Mobile communication devices: These devices are characterized by their mobile communication capabilities and are primarily designed to provide voice and data communications. These terminals include smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones.

[0104] (2) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access. These terminals include PDAs, MIDs, and UMPCs, such as the iPad.

[0105] (3) Portable entertainment devices: These devices can display and play multimedia content. These devices include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0106] (4) Door locks, vehicle locks and other electronic devices with data interaction functions.

[0107] Thus far, specific embodiments of the present subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing may be advantageous.

[0108] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0109] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0110] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. An optical fingerprint recognition module, characterized in that: The optical fingerprint recognition module is arranged on a first printed circuit board below the cover plate, and the upper surface of the cover plate has a fingerprint imaging area. The optical fingerprint recognition module includes: An optical lens is disposed below the cover plate and corresponds to the fingerprint imaging area, the optical lens is used to converge the fingerprint detection signal formed by the through hole of the light guide element, the light guide element is used to make the light emitted by the light source scatter and evenly irradiate the human finger in the fingerprint imaging area, and form reflected light after being reflected by the human finger, the reflected light passes through the cover plate of the fingerprint imaging area, and forms the fingerprint detection signal through the through hole; The optical sensor is arranged on the first printed circuit board and is located below the optical lens. The optical sensor is used to receive the fingerprint detection signal gathered by the optical lens. The fingerprint detection signal is used to detect the fingerprint information of the human finger.

2. The optical fingerprint recognition module according to claim 1, characterized in that: The material of the light guide element includes: a light-transmitting material with scattering properties.

3. The optical fingerprint recognition module according to claim 2, characterized in that: The material of the light-guiding element is added with a material that enhances scattering performance.

4. The optical fingerprint recognition module according to claim 1, characterized in that: The through hole includes an upper opening and a lower opening, the upper opening is an opening close to the cover plate, and the lower opening is an opening close to the optical fingerprint recognition module. The upper opening and the lower opening are connected to form a passage of the through hole, and the passage of the through hole is greater than or equal to the field of view angle area of ​​the optical fingerprint recognition module.

5. The optical fingerprint recognition module according to claim 4, characterized in that: If the upper opening is circular, the diameter of the upper opening is greater than or equal to the minimum opening diameter, wherein the diameter of the minimum opening is calculated as shown in Formula 1, which is: Wherein, L2 is the minimum opening diameter, w1 is the width of the fingerprint imaging area, h1 is the height of the fingerprint imaging area, d is the thickness of the cover plate, α is the diagonal field angle of the optical fingerprint recognition module, and n is the refractive index of air relative to the cover plate; If the upper opening is rectangular, the width of the upper opening is greater than or equal to the minimum opening width. The height of the upper opening is greater than or equal to the minimum opening height, wherein the minimum opening width is calculated as shown in Formula 2, and the minimum opening height is calculated as shown in Formula 3. The formula 2 is: The formula three is: Among them, w2 is the minimum opening width, and h2 is the minimum opening height.

6. The optical fingerprint recognition module according to claim 4 or 5, characterized in that: The lower opening is in clearance with the optical lens, and the lower opening enables the fingerprint detection signal passing through the lower opening to be focused on the optical lens.

7. The optical fingerprint recognition module according to claim 6, characterized in that: The optical lens is arranged at a height equal to or higher than a height of the lower opening.

8. The optical fingerprint recognition module according to claim 1, characterized in that: The setting position and lighting direction of the light source meet one of the following conditions: The light source is disposed on the first printed circuit board and is located below the light guide element, and the light irradiation direction of the light source is toward the fingerprint imaging area; The light source is arranged on the lateral outer surface of the light guide element, and the light irradiation direction of the light source is toward the fingerprint imaging area; The light source is disposed on the first printed circuit board and is located on the side of the light guide element. The light direction of the light source is toward the cover plate, and part of the light emitted by the light source is toward the fingerprint imaging area. The light source is arranged on the inner surface of the side of the light guide element, and the light irradiation direction of the light source is toward the fingerprint imaging area; The light source is arranged on the first printed circuit board and is located on the side of the light guide element. The light source is directed toward the cover plate. A reflective mirror is arranged on the cover plate so that the light emitted by the light source is directed toward the fingerprint imaging area after passing through the reflective mirror.

9. The optical fingerprint recognition module according to claim 8, characterized in that: The light-guiding element includes a body and support columns respectively arranged at both ends of the body, the support columns are used to support the body and form a cavity between the body and the first printed circuit board, the through hole is arranged on the body, and the optical fingerprint recognition module is arranged in the cavity and its position corresponds to the position of the through hole.

10. The optical fingerprint recognition module according to claim 1, characterized in that: The light sources are symmetrically arranged around the optical fingerprint recognition module.

11. The optical fingerprint recognition module according to claim 1, characterized in that: A filter is also arranged on the upper surface of the optical sensor.

12. The optical fingerprint recognition module according to claim 1, characterized in that: The optical fingerprint recognition module further includes: a peripheral light-shielding shell, which is arranged at the periphery of the optical lens and the optical sensor, and the peripheral light-shielding shell is used to block light from irradiating the optical sensor.

13. An optical fingerprint recognition device, characterized in that: The optical fingerprint recognition device is arranged below the cover plate, the upper surface of the cover plate has a fingerprint imaging area, and the optical fingerprint recognition device comprises: a light guide element and an optical fingerprint recognition module according to any one of claims 1-12.

14. An electronic device, characterized in that: include: The cover plate and the optical fingerprint recognition device as claimed in claim 13, wherein the optical fingerprint recognition device is arranged under the cover plate to realize fingerprint information detection of human fingers.

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