CN108960007B

CN108960007B - Optical fingerprint identification module

Info

Publication number: CN108960007B
Application number: CN201710357765.4A
Authority: CN
Inventors: 徐茂修; 丁冠堡
Original assignee: Primax Electronics Ltd
Current assignee: Primax Electronics Ltd
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2022-01-04
Anticipated expiration: 2037-05-19
Also published as: CN108960007A

Abstract

The invention is an optical fingerprint identification module, comprising: a shell, an image acquisition component, a light guide diffusion layer, a light gathering reflection layer, a pressing plate, at least one light source and a light channel structure. The light channel structure is formed below the pressing plate and above the image acquisition assembly, and penetrates through the light condensation reflecting layer and part of the light guide diffusion layer to be surrounded by the light condensation reflecting layer and part of the light guide diffusion layer. The light emitted by the at least one light source can be conducted and diffused in the light guide diffusion layer and can form condensation and reflection in the light condensation reflection layer, and the light emitted by the at least one light source can reciprocate between the light guide diffusion layer and the light condensation reflection layer, further irradiates the pressing plate through the light channel structure and is reflected to the image acquisition assembly to be acquired. The invention can effectively increase the utilization rate of light.

Description

Optical fingerprint identification module

Technical Field

The present invention relates to the field of fingerprint identification technologies, and in particular, to an optical module for fingerprint identification. The module utilizes the design of multi-level diffusion and condensation, so that the light can generate the conditions of repeated refraction, reflection, scattering, conduction and the like, and the utilization rate of the light can be more effectively increased.

Background

In order to ensure information security, biometric identification technology has become a key development project in various industries nowadays. Among them, fingerprint (fingerprint) recognition is one of the most common and widely used biometric technologies.

A fingerprint is a pattern consisting of many curved lines. And, on an enlarged scale, these lines appear as peaks and valleys and undulate. Therefore, the fingerprint features are the distribution of the lines, and almost everyone has different fingerprint features, so that the uniqueness of the fingerprint features can be used as the identification basis of the identity.

Fingerprint identification techniques currently used are broadly classified into capacitive and optical types. The capacitance type fingerprint sensor mainly scans the conditions of charge change, temperature difference, pressure and the like on a finger through a capacitance sensor so as to obtain the fingerprint structure of the finger. The optical system directly captures the fingerprint image, i.e. irradiates the finger with light to highlight the contrast between the peaks and troughs of the lines, and uses the image capturing module to take a photograph for subsequent analysis. Although the capacitor has the features of being thinner, shorter, and shorter, the cost is higher than that of the optical type.

Because the storage space required for the image or data of each fingerprint is not large, the fingerprint identification module is increasingly applied to the mobile electronic device or the notebook computer. Whether capacitive or optical, the purpose is to acquire the structure or image of the fingerprint, and further use the algorithm to calculate and compare with the stored file for analysis, so as to identify the identity of the user.

In addition, the acquisition method of the optical fingerprint identification module for the fingerprint image mainly comprises a sliding type and a pressing type. The sliding type mainly comprises the steps of sliding fingers on the module and shooting at the same time, and then collaging the shot images by a program to combine into a complete fingerprint image. The pressing type is to press the finger on the module for a certain time to complete the acquisition of the fingerprint image.

Generally, although the sliding type identification module is small and inexpensive and is easy to be installed on the mobile electronic device, the user must slide in a specific direction and speed, otherwise the identification error is easily caused. In contrast, although the pressing type identification module provides a convenient operation interface for a user, it also needs a larger sensing area because it can capture a complete fingerprint image at one time, and therefore occupies more space and has a higher production cost.

Fig. 1 is a schematic cross-sectional view of an optical push type fingerprint identification module 1 in the prior art. As shown in fig. 1, the fingerprint identification module 1 includes an image capturing component 11, two

light sources

121, 122, a light diffusing plate 13 and a pressing plate 10. The pressing plate 10 provides a finger a to press on one surface 100 thereof, and the two

light sources

121 and 122 provide light irradiation. It is understood that the pressing plate 10 and the light diffusion plate 13 have light transmittance in order to allow light to effectively penetrate and form irradiation to fingers.

Next, the light diffusion plate 13 can guide or refract the light to irradiate the pressing plate 10 to form a surface light source, and has an opening 130 to transmit the light (especially, the peak portion of the pattern) reflected by the finger a, and further to be received and photographed by the image capturing device 11.

As can be seen from fig. 1 and the foregoing description, the pressing plate 10 needs to have a larger sensing area to provide one-time pressing. However, the light may be emitted from the

light sources

121 and 122 at various angles, so that not all the light can be focused on the finger a, and a part of the light may be directly emitted from the side of the finger a through the pressing plate 10. Therefore, the irradiation efficiency of the light source is reduced, and even the image acquisition quality is affected.

Since the optical fingerprint recognition module is widely used as a fingerprint recognition technology for mobile electronic devices, it can provide users with intuitive and simple operation. However, if there are other defects in the technology besides high cost setting or large space occupation, for example, the most important image capturing effect, it will make the development of the technology in the market difficult to have competitive advantage. Therefore, how to solve this problem is the main objective of the development of the present disclosure.

Disclosure of Invention

The invention aims to provide an optical fingerprint identification module. The module uses side light type illumination and utilizes the design of multi-layer diffusion and condensation, so that light can generate repeated refraction, reflection, scattering, conduction and the like, and the utilization rate of the light can be more effectively increased. Therefore, the light can be gathered on the specific light channel, and the acquisition quality of the fingerprint image can be improved.

The invention relates to an optical fingerprint identification module, comprising: a shell, an image acquisition component, a light guide diffusion layer, a light gathering reflection layer, a pressing plate, at least one light source and a light channel structure. The image acquisition assembly is arranged in the shell. The light guide diffusion layer is arranged above the image acquisition assembly. The light gathering reflection layer is arranged above the light guide diffusion layer. The pressing plate is arranged on the shell and above the light gathering reflection layer for providing pressing. The at least one light source is respectively arranged on at least one side end of the light guide diffusion layer and the light gathering reflection layer. The light channel structure is formed below the pressing plate and above the image acquisition assembly, and penetrates through the light gathering reflection layer and part of the light guide diffusion layer to be surrounded by the light gathering reflection layer and part of the light guide diffusion layer. The light emitted by the at least one light source can be conducted and diffused in the light guide diffusion layer and can form condensation and reflection in the light condensation reflection layer, and the light emitted by the at least one light source can reciprocate between the light guide diffusion layer and the light condensation reflection layer, further irradiates the pressing plate through the light channel structure and is reflected to the image acquisition assembly to be acquired.

In order to better understand the above and other aspects of the present invention, the following detailed description is given with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic cross-sectional view of an optical push type fingerprint identification module 1 in the prior art.

Fig. 2 is a schematic cross-sectional view of an optical fingerprint identification module 2 according to the present invention.

Fig. 3A is a schematic diagram of a possible path of light on a diffuser 252.

Fig. 3B is a schematic diagram of a possible path of light on a light-focusing sheet 281.

Fig. 4 is a schematic cross-sectional view of an optical fingerprint identification module 2' according to the present invention.

Description of reference numerals:

1: fingerprint identification module 10: pressing plate

100: surface 11: image acquisition assembly

121. 122: light source 13: light diffusion plate

130: opening a hole A: finger(s)

2. 2': optical fingerprint recognition module 20: shell body

21: pressing plate 22: image acquisition assembly

23: line structures 241, 242: light source

25: light guide diffusion layer 251: light guide plate

251 a: microstructure 252: diffusion sheet

252 a: diffusion particles 26: bottom reflector

27. 27': light channel structure 28: light-gathering reflecting layer

281: light-condensing

sheets

281a, 281 a': prism body

282: top reflector B: finger(s)

S1, S2: side ends L1-L4: light ray

Detailed Description

The following embodiments are provided for illustrative purposes only and do not limit the scope of the present invention. In addition, the drawings in the embodiments omit elements which are not necessary or can be accomplished by a general technique to clearly show the technical features of the present invention.

The invention will now be described with reference to a first embodiment. Referring to fig. 2, a cross-sectional view of an optical fingerprint identification module 2 according to a first embodiment of the present invention is shown. As shown in fig. 2, the optical fingerprint identification module 2 includes a housing 20, an image capturing component 22, a light guiding diffusion layer 25, a light condensing reflection layer 28, a pressing plate 21, two

light sources

241, 242, a light channel structure 27, and a bottom reflection sheet 26. In the first embodiment, the optical fingerprint identification module 2 is applied to a mobile electronic device (not shown in the drawings), but is not limited thereto. Therefore, in terms of the conventional manufacturing method, the housing 20 is a part of the casing of the mobile electronic device; alternatively, the housing 20 can be otherwise secured in the mobile electronic device to which it is applied.

The positional correspondence of these elements on the arrangement is presented in fig. 2. As shown in fig. 2, most of the components or assemblies are disposed in the housing 20, and only the pressing plate 21 is disposed on the housing 20 for providing a finger B to press; for example, in an embedded manner, on the opening hollowed out of the housing 20. The image capture assembly 22 is disposed in the housing 20 at a position relatively at the bottom of the overall module. Next, the light guiding diffusion layer 25 is disposed above the image capturing assembly 22, the light gathering reflection layer 28 is disposed above the light guiding diffusion layer 25, and the pressing plate 21 is disposed on the outermost layer and above the light gathering reflection layer 28.

As mentioned above, the light channel structure 27 is formed below the pressing plate 21 and above the image capturing assembly 22, that is, corresponds to the image capturing assembly 22 up and down, and the light channel structure 27 passes through the light gathering reflective layer 28 and a part of the light guiding diffusion layer 25 and is surrounded by the light gathering reflective layer 28 and a part of the light guiding diffusion layer 25. In detail, the light channel structure 27 can be formed by engraving a hole with a specific aperture on the light gathering reflective layer 28 and a portion of the light guiding diffusion layer 25, and then embedding a specified material therein.

The aperture size preferably corresponds to the possible dimensions of the finger B, or for example, for different image acquisition applications, sliding and pressing, in addition to the image acquisition element 22.

In the first embodiment, the Optical channel structure 27 is made of a light-transmitting material, such as Liquid Optical Clear Adhesive (LOCA); i.e. a typical Ultraviolet (UV) curable glue. It can be formed into a specific pattern besides being combined with surrounding elements and fixed, and has the property of light permeability. In detail, the light channel structure 27 in fig. 2 is further formed to extend between the pressing plate 21 and the light gathering reflective layer 28 to enhance the bonding with the related devices, but not limited thereto; for example, other embodiments may directly contact the pressing plate and the light-gathering reflective layer without filling the liquid optical adhesive.

As mentioned above, the light guiding diffusion layer 25 in fig. 2 is composed of a light guiding plate 251 and a diffusion sheet 252, and the diffusion sheet 252 is disposed on the light guiding plate 251. Secondly, the light gathering reflective layer 28 is composed of a light gathering sheet 281 and a top reflective sheet 282, the top reflective sheet 282 is disposed on the light gathering sheet 281 and combined with the extending portion of the light channel structure 27; the light-gathering sheet 281 is disposed on the light guide diffusion layer 25, particularly on the diffusion sheet 252 therein. In addition, the bottom reflector 26 in fig. 2 is disposed below the light guide diffusion layer 25, particularly below the light guide plate 251 therein, and surrounds the image capturing assembly 22.

On the other hand, the two

light sources

241 and 242 used in the first embodiment are respectively disposed at the side ends S1 and S2 of the light guide diffusion layer 25 and the light gathering reflection layer 28. In detail, the

light sources

241, 242 may be in the form of a light bar assembly, that is, each light bar has a plurality of leds. By closely attaching the two

light sources

241, 242 in the form of linear light sources to the side end S1 and the side end S2, the emitted light can be transmitted into the light guide diffusion layer 25 for transmission, thereby generating the backlight form of the surface light source. In other words, the optical fingerprint identification module 2 of the present invention is a side-light type fingerprint identification module, and the volume or thickness of the whole module is relatively ultra-thin.

Although the top reflector 282 and the bottom reflector 26 at the side ends S1 and S2 in fig. 2 are illustrated as being disposed to cover the two

light sources

241 and 242 up and down, the invention is not limited thereto. For example, other ways may be designed to make the two light sources laterally abut against the top reflector and the bottom reflector on their respective side ends, that is, the top reflector on the upper layer is designed to have the same width as the light-gathering sheet 281 and the diffusion sheet 252 in fig. 2. It will be appreciated that the arrangement of this portion may be dependent on the type of light strip used and the purpose of this arrangement is to prevent gaps or gaps at the junction of the elements from allowing light to escape.

Moreover, the fingerprint identification module 2 further includes a circuit structure 23, and the circuit structure 23 is electrically connected to the image capturing component 22 and the

light sources

241 and 242 for providing necessary power and performing electrical signal transmission. In the first embodiment, the Circuit structure 23 is disposed by using a Flexible Printed Circuit Board (FPCB) to achieve the wiring and electrical connection on the bottom and the side wall in the housing 20. Although the circuit structure 23 in fig. 2 is illustrated as being completely covered by the housing 20, it is understood that the housing 20 must also have a corresponding circuit hole for the circuit structure 23 to pass through for electrically connecting to other circuits or components in the mobile electronic device.

In the first embodiment, the image capturing device 22 may be composed of a processor, a memory, a camera lens, and a transmission interface, but is not limited thereto. For example, in other embodiments, the processor and the memory may not be disposed therein, but only a simple photographing lens; that is, the captured image can be processed by the processing unit in the mobile electronic device.

In view of the above, it can be seen that the design of the fingerprint identification module 2 of the present invention is to guide the light emitted from the

light sources

241, 242 to the light channel structure 27. In fig. 2, various possible directions and paths (indicated by arrows) of the light emitted by the

light sources

241, 242 inside the housing 20 are also illustrated, and the forms of the paths include reflection, transmission, refraction, and the like. Therefore, in the first embodiment, the light emitted by the

light sources

241 and 242 can be transmitted and diffused in the light guide diffusion layer 25, and can be condensed and reflected in the light condensing reflection layer 28, and the light emitted by the

light sources

241 and 242 can go back and forth between the light guide diffusion layer 25 and the light condensing reflection layer 28, and further irradiate the pressing plate 21 through the light channel structure 27, and then is reflected to the image capturing assembly 22 to be captured.

In detail, the light guide plate 251 can transmit the emitted light through the plurality of microstructures 251a, so that the light originally in the form of a linear light source can form a surface light source on the light emitting surface of the light guide plate 251 (i.e., the interface between the light guide plate 251 and the diffusion sheet 252 and the light channel structure 27). The microstructure 251a in fig. 2 is illustrated as a rectangular saw-tooth pattern, but the invention is not limited thereto; for example, the shape of the convex portion may be a triangular pyramid. In addition, the microstructures 251a in fig. 2 are illustrated as being in an equidistant pattern, but the invention is not limited thereto; for example, the pitch may be gradually reduced from both sides toward the center.

On the other hand, as shown in fig. 2, the diffusion sheet 252 can diffuse the emitted light by the diffusion particles 252a included therein. In the current art, the diffusion sheet 252 is an optical diffusion film (Diffuser) that provides a uniform surface light source. Generally, spherical particles (different in size) with high light transmittance are dispersedly coated or embossed in a substrate (such as PET) to serve as diffusion particles, so that when light passes through the medium with two different refractive indexes, the light is refracted and scattered, and an optical diffusion effect is generated.

As shown in fig. 2, the light-condensing sheet 281 may condense the emitted light through a plurality of prism bodies 281 a. In the prior art, the light-collecting sheet 281 is a Prism Film (or referred to as a brightness enhancement Film or brightness enhancement Film) that can provide light intensity concentration to improve brightness or luminance. Generally, a whole row of triangular structures (different in size) are uniformly pressed on the light-emitting surface of a substrate (e.g., PET) to serve as prism bodies, so that light is refracted and reflected to a specific direction to adjust the light intensity distribution when passing through the prism bodies, i.e., the light can be concentrated and recycled to reduce the loss, thereby improving the brightness or luminance.

Please refer to fig. 3A and fig. 3B; FIG. 3A is a schematic diagram of a possible path of light on the diffuser 252; fig. 3B is a schematic diagram of a possible path of light on the light-focusing sheet 281.

First, as shown in fig. 3A, the sizes of the diffusion particles 252a are designed to be the same, and a plurality of light rays are vertically incident on the diffusion sheet 252, and are refracted after entering the diffusion particles 252 a. However, since the light beams are refracted at different positions, the positions and directions of the light beams emitted from the particles are different from each other, and the irradiation range of the entire incident light beam is increased. Moreover, the light incident into the diffusion sheet 252 may have various angles, so that it can be understood that the diffusion sheet 252 can further provide better diffusion effect when the light is uniformly transmitted on the light guide plate 251 and distributed as a surface light source.

Next, as shown in fig. 3B, the sizes of the prism bodies (e.g., the prism body 281a and the prism body 281 a') are designed to be the same, and the illustrated light beams L1-L4 enter the light-gathering sheet 281 at different angles, and then are reflected or refracted at different angles after entering the different prism bodies. For example, after a light ray L1 is incident upwards from the opposite lower left, it is reflected and travels towards the original incident position; another light ray L2 is incident upward from the opposite lower right, reflected and travels toward the original incident position; the other light L3 goes upward after being refracted out of the corresponding prism 281 a; the other light L4 is refracted out of the corresponding prism 281a and then enters another adjacent prism 281 a', and is refracted and travels toward the opposite lower right direction.

As described above, as shown in fig. 2 and 3B, the bottom reflector 26 can reflect the light passing through the light guide diffusion layer 25 (especially the light guide plate 251), so that the light L1, L2, and L4 returns to the light guide diffusion layer 25 after being reflected and refracted for an unspecified number of times, and is diffused and transmitted by the diffusion sheet 252 and the light guide plate 251. In addition, the top reflector 282 can reflect the light L3 passing through the light-gathering sheet 281 (especially the portion of the prism 281a therein), so that the light L3 returns to the light-gathering reflective layer 28 and the light-guiding diffusion layer 25 after undergoing an unspecified number of reflections and refractions, so that the light energy of either the upper layer or the lower layer is not easily lost.

Thus, the light emitted by the two

light sources

241, 242 will remain in the housing 20 when the light has not reached the position where the light can leave the housing 20 (i.e. the light channel structure 27). In other words, the emitted light is more and more driven to the position of the light channel structure 27 inside the housing 20 by the related reflection, refraction, diffusion and condensation phenomena.

In the first embodiment, the light channel structure 27 is made of a light-transmitting material of liquid optical cement, and the refractive index of the liquid optical cement is between 1.50 and 1.54. Thus, when light enters the light channel structure 27 from the light guide plate 251, the diffusion sheet 252 or the light-gathering sheet 281, the light is refracted accordingly, so that a favorable angle can be formed to irradiate the pressing plate 21 from the position of the light channel structure 27; i.e., the finger B above it is irradiated, and photographed by the image taking unit 22 to obtain a fingerprint image.

The form of the two

light sources

241, 242 provided in the first embodiment may be different according to the requirement; for example, a Light Emitting Diode (LED) that emits visible light or a light emitting diode that emits invisible light of an Infrared (IR) type may be used. Therefore, the image capturing device 22 is configured to sense visible light or invisible light according to the type of light source.

On the other hand, in the prior art, the top reflector 282 and the bottom reflector 26 are reflective films (Reflection films) capable of providing high Reflection of light. This is typically done by plating the surface of the substrate, and the material to be plated may be, for example, silver or aluminum.

The invention can also be designed in a further variant according to the first embodiment described above. For example, the light guide plate 251 may be provided with a plurality of microstructures 251a to reflect the passing light; that is, the bottom reflection sheet 26 is not provided. Thus, although the light reflection efficiency may be reduced, the housing 20 itself may be made of a highly reflective material, so that the light may not escape excessively to affect the illumination efficiency.

Or, the invention can also be arranged by only adopting a light source on one side; that is, only one of the light source 241 and the light source 242 in fig. 2 may be provided. It should be noted that, in order to achieve better light transmission and illumination effect, the light channel structure 27 in fig. 2 is relatively located between the two

light sources

241, 242, so as to reflect the optimal position of light accumulation. Therefore, if only a single-sided light source is provided, the light channel structure may need to be formed at a certain distance from the light source, i.e. near the other end of the housing, so as to emit the light with the maximum accumulation.

The invention will now be described with reference to a second embodiment. Referring to fig. 4, a cross-sectional view of an optical fingerprint identification module 2' according to a second embodiment of the present invention is shown. As shown in fig. 4, the difference between this second embodiment and the first embodiment is that a light channel structure 27' in the second embodiment is directly represented as a via; that is, after the light gathering reflective layer 28 and a portion of the light guiding diffusion layer 25 are engraved, no material is embedded.

As mentioned above, in the design that the light channel structure 27' is only a hole, the periphery of the structure does not extend to between the pressing plate 21 and the top reflection sheet 282, i.e. the top reflection sheet 282 is directly contacted and combined with the pressing plate 21. In other embodiments, the top reflector and the pressing plate may be combined by using a related adhesive (which may not be a transparent material), but the adhesive is required to form an opening at a position corresponding to the light channel structure.

In this second embodiment, although the light tunnel structure 27' does not have a material with a larger refractive index (i.e. a medium of air), the refraction of light is different from that of the first embodiment. However, no matter what kind of material with light transmission, such as glass or glue, there is still its light attenuation rate, that is, it still causes possible energy loss to the passing light. Thus, the light channel structure 27' shown directly as a channel in fig. 4 instead allows light to be irradiated to the pressing plate 21 in an optimal manner, and the captured fingerprint image can also have good quality due to sufficient illumination.

The present invention can be further modified according to the first and second embodiments described above. Specifically, the invention can change the depth of the engraved aperture on the disclosed optical channel structure; for example, the light channel structure can be designed to pass through only the light gathering reflective layer and not the light guiding diffusion layer. Thus, the light guide diffusion layer of the design, especially the diffusion sheet therein, is arranged on the light guide plate of the light guide diffusion layer in a whole surface manner, and the light channel structure of the design is formed above the whole light guide diffusion layer and is only surrounded by the light gathering reflection layer.

As mentioned above, the light guide diffusion layer with such a modified design can diffuse the emitted light, especially the light from the light guide plate under the diffusion sheet, by using the plurality of diffusion particles; the diffused light can then be injected directly into the light tunnel structure. Although the light transmission manner is slightly different from the two embodiments, the required illumination effect and good fingerprint image photographing quality can be generated.

In summary, the fingerprint recognition module of the present invention, especially an optical fingerprint recognition module, can be effectively applied to the mobile electronic device in the prior art, and can be applied to both sliding and pressing image acquisition methods. The technical effect enhancement that the invention can achieve includes: firstly, because of using the side light type illumination, the thickness of the whole module can be effectively reduced; secondly, the light rays can generate repeated refraction, reflection, scattering, conduction and other conditions by utilizing the design of multi-level diffusion and condensation, so that the utilization rate of the light rays can be more effectively increased; thirdly, the light can be gathered on a specific light channel, so that the acquisition quality of the fingerprint image can be improved.

Accordingly, the present invention has been made to solve the problems associated with the prior art, and to achieve the primary objects of the present disclosure.

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims

1. An optical fingerprint identification module, comprising:

a housing;

an image acquisition component arranged in the shell;

a light guide diffusion layer arranged above the image acquisition assembly;

a light gathering reflection layer arranged above the light guide diffusion layer;

a pressing plate disposed on the housing and above the light-gathering reflective layer for providing pressing;

at least one light source respectively arranged on at least one side end of the light guide diffusion layer and the light gathering reflection layer;

the bottom reflector plate is arranged below the light guide diffusion layer and surrounds the image acquisition assembly, and is used for reflecting light rays penetrating out of the light guide diffusion layer; and

the light channel structure is formed below the pressing plate and above the image acquisition assembly, penetrates through the light condensation reflecting layer and part of the light guide diffusion layer and is surrounded by the light condensation reflecting layer and part of the light guide diffusion layer;

the light emitted by the at least one light source can form conduction and diffusion in the light guide diffusion layer and form condensation and reflection in the light condensation reflection layer, and the light emitted by the at least one light source can reciprocate between the light guide diffusion layer and the light condensation reflection layer, further irradiates the pressing plate through the light channel structure and is reflected to the image acquisition assembly to be acquired;

wherein the light guide diffusion layer comprises:

a light guide plate having multiple microstructures for transmitting light emitted from the at least one light source; and

a diffusion sheet arranged on the light guide plate and having multiple diffusion particles for diffusing the light emitted from the at least one light source; and

wherein the light-gathering reflective layer comprises:

a light-gathering sheet arranged on the light-guiding diffusion layer and provided with a plurality of prism bodies for gathering light emitted by the at least one light source; and

and the top reflector plate is arranged on the light gathering plate and used for reflecting the light penetrating out of the light gathering plate.

2. The optical fingerprint identification module of claim 1, further comprising a circuit structure electrically connected to the image capturing assembly and the at least one light source for providing power and transmitting electrical signals.

3. The optical fingerprint identification module of claim 1, wherein the light channel structure is made of a transparent material, and the light channel structure extends between the pressing plate and the light-gathering reflective layer.

4. The optical fingerprint identification module of claim 3, wherein the transparent material is a liquid optical adhesive, and the refractive index of the liquid optical adhesive is between 1.50 and 1.54.

5. The optical fingerprint identification module of claim 1, wherein said light channel structure is a tunnel.

6. The optical fingerprint identification module of claim 1, wherein the light emitted by the at least one light source is visible light or invisible light, and the image capturing component is configured in a manner of sensing the visible light or the invisible light.

7. An optical fingerprint identification module, comprising:

a housing;

an image acquisition component arranged in the shell;

a light guide diffusion layer arranged above the image acquisition assembly;

a light channel structure formed below the pressing plate and above the image acquisition assembly and the light guide diffusion layer, and passing through the light gathering reflection layer and surrounded by the light gathering reflection layer;

wherein the light guide diffusion layer comprises:

wherein the light-gathering reflective layer comprises: