Biological information recognition module and electronic device

Abstract

The present application provides a biological information recognition module and an electronic device, which relate to the technical field of electronic devices. The biological information recognition module includes an optical path guiding layer and a photosensitive pixel array arranged in sequence. The optical path guiding layer includes a plurality of optical channels, and the photosensitive pixel array includes a plurality of photosensitive pixel units. The light beams carrying biological information are incident on the corresponding photosensitive pixel units after passing through the optical channels respectively. Among them, the optical path guiding layer includes a central region and a peripheral region surrounding the central region, and there is an included angle between the optical channels in the peripheral region and a first straight line perpendicular to the surface of the photosensitive pixel array. It is possible to expand the range of biological information collection of the biological information recognition module under the existing structural dimensions through the modular structure design of optical elements, so as to ensure the accuracy of biological information recognition and reduce the structural dimensions of the biological information recognition module under the existing requirements for the biological information collection area.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and particularly to a biological information recognition module and an electronic device. Background Art

[0002] With the highly development of the intelligence of terminal electronic devices led by handheld mobile terminals, the application of human biological information recognition in electronic devices has become more and more in-depth and extensive. It has gradually developed from unlocking the electronic device through biological information recognition in the past to identity recognition and authentication of various software programs. As the application scope of biological information recognition in electronic devices becomes wider and wider, the accuracy of biological information recognition and the recognition ability and recognition speed of electronic devices, especially display electronic devices, for fingerprint information have also increased accordingly.

[0003] In the prior art, for biological information recognition applied to electronic devices such as mobile phones and tablet computers, such as fingerprint recognition, the main recognition method is optical fingerprint recognition. Usually, the light source of the display panel irradiates the fingerprint and reflects it, and the optical detection device receives, records or analyzes the fingerprint reflected light carrying specific biological information to achieve the function of recording the fingerprint or recognizing a specific fingerprint. In recent years, with the miniaturization requirements of electronic devices such as mobile phones and tablet computers, the requirements for the thinning and miniaturization of the fingerprint recognition module provided inside the electronic device have also become higher and higher.

[0004] Generally, the fingerprint recognition module applied under the display screen needs to receive, record or analyze the fingerprint reflected light carrying specific biological information to achieve the recognition of a specific fingerprint. Due to the miniaturization requirements of electronic devices, the volume of the optical detection device for realizing fingerprint recognition also needs to be continuously reduced. In order to ensure the accuracy of biological information recognition, the acquisition area of biological information on the display screen should at least be guaranteed within a relatively small area range. Taking fingerprint recognition as an example, it should usually be above the range of 6mm * 6mm. This results in the structure of the fingerprint recognition module being difficult to further reduce, thus greatly affecting the miniaturization of electronic devices. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a biological information recognition module and an electronic device, which can expand the range of biological information acquisition diagram of the biological information recognition module under the existing structural dimensions through the modular structure design of optical elements, so as to ensure the accuracy of biological information recognition and reduce the structural dimensions of the biological information recognition module under the existing biological information acquisition area requirements.

[0006] An embodiment of the present application provides a biometric information recognition module, which includes an optical path guiding layer and a photosensitive pixel array arranged in sequence. The optical path guiding layer includes a plurality of optical channels, and the photosensitive pixel array includes a plurality of photosensitive pixel units. The light beams carrying biometric information are incident on the corresponding photosensitive pixel units after passing through the optical channels respectively. Among them, the optical path guiding layer includes a central region and a peripheral region surrounding the central region, and there is an included angle between the optical channels in the peripheral region and a first straight line perpendicular to the surface of the photosensitive pixel array.

[0007] Optionally, along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase.

[0008] Optionally, along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase with a fixed increase.

[0009] Optionally, the fixed increase is 0.05° to 2°.

[0010] Optionally, along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase with a varying increase.

[0011] Optionally, along the direction from the center to the edge of the optical path guiding layer, the varying increase gradually decreases.

[0012] Optionally, there is an included angle between the plurality of optical channels in the central region and the first straight line, and the included angles are the same. And / or, there are a plurality of peripheral regions surrounding the central region, and the included angles between the plurality of optical channels in the same peripheral region and the first straight line are the same.

[0013] Optionally, the optical channels within the width range of one peripheral region correspond to 1 to 10 photosensitive pixel units in the photosensitive pixel array.

[0014] Optionally, the center of the central region coincides with the center of the peripheral region; and / or, the peripheral region is in the shape of a circular ring, a square ring, a triangular ring or an irregular ring.

[0015] Optionally, in the longitudinal section passing through the central region, the plurality of optical channels are arranged in a fan shape with the central region as the center.

[0016] Optionally, for at least some of the optical channels, the channel aperture on the side away from the photosensitive pixel array is greater than or equal to the channel aperture on the side close to the photosensitive pixel array.

[0017] Optionally, the channel aperture of the optical channel gradually increases along the direction in which the light beam is incident on the photosensitive pixel unit.

[0018] Optionally, the central axis of the optical channel is a second straight line. In the longitudinal section passing through the second straight line, the included angles between the two boundaries of at least some of the optical channels and the first straight line are different.

[0019] Optionally, for at least part of the optical channels, the first boundary angle of the optical channel is smaller than the second boundary angle, where the first boundary angle is the angle between the boundary of the optical channel close to the central region and the first straight line, and the second boundary angle is the angle between the boundary of the optical channel far from the central region and the first straight line.

[0020] Optionally, the optical channel in the central region has an angle with the first straight line, or the optical channel in the central region is parallel to the first straight line.

[0021] Optionally, a plurality of collimation holes are provided through the optical path guiding layer, and the plurality of collimation holes respectively serve as optical channels.

[0022] Optionally, the optical path guiding layer includes a microlens array and at least one diaphragm layer disposed below the microlens array. A plurality of diaphragm holes through which light beams can pass are distributed on the diaphragm layer. The microlens array includes a plurality of microlens units, and the microlens units and the corresponding diaphragm holes serve as optical channels.

[0023] Optionally, the optical path guiding layer includes multiple diaphragm layers spaced along the light transmission direction. A plurality of diaphragm holes through which light beams can pass are distributed on the diaphragm layers, and the diaphragm holes corresponding in position on the multiple diaphragm layers form at least a part of the optical channel.

[0024] Optionally, the distance between adjacent two diaphragm layers is greater than or equal to 5 micrometers.

[0025] Optionally, the angle of the optical channel in the peripheral region is less than or equal to 60°.

[0026] Optionally, the angle of the optical channel in the peripheral region is less than or equal to 10° - 45°.

[0027] Optionally, it further includes an optical sensor, and the photosensitive pixel array is integrated in the photosensitive recognition area of the optical sensor.

[0028] Optionally, the optical sensor includes a metal structure layer, and the optical path guiding structure further includes a metal light-shielding layer, and the metal light-shielding layer multiplexes the metal structure layer on the optical sensor; at least one metal light-shielding layer is correspondingly provided with a light-transmitting part to form an optical channel.

[0029] Optionally, the multiplexed metal structure layer includes 2 - 5 layers.

[0030] On the other hand, an embodiment of the present application provides an electronic device, including a display screen, and a biometric information recognition module as described in any one of the foregoing disposed below the display screen.

[0031] Optionally, a biometric information recognition area for obtaining a light beam carrying biometric information is preset on the display screen, and the area of the biometric information recognition area is larger than the light beam receiving area of the photosensitive pixel array in the biometric information recognition module.

[0032] The biometric information recognition module provided by the embodiment of the present application includes an optical path guiding layer and a photosensitive pixel array arranged in sequence. The optical path guiding layer includes a plurality of optical channels, and the photosensitive pixel array includes a plurality of photosensitive pixel units. The light beams carrying biometric information are incident on the corresponding photosensitive pixel units through the optical channels respectively. Among them, the optical path guiding layer includes a central area and a peripheral area surrounding the central area, and there is an included angle between the optical channels in the peripheral area and the first straight line perpendicular to the surface of the photosensitive pixel array. Through the guiding effect of the optical channels with an included angle with the first straight line, the light beams carrying biometric information in a larger area range can be incident on the photosensitive pixel array. That is, without changing the area of the photosensitive pixel array, the biometric information acquisition area of the display screen is increased, so that the biometric information acquisition area is larger than the photosensitive area of the photosensitive pixel array. Furthermore, the biometric information recognition module of the embodiment of the present application can receive more optical signals, thereby obtaining more biometric information. On the other hand, without increasing the biometric information acquisition area of the display screen, the photosensitive area of the photosensitive pixel array is effectively reduced, the volume of the photosensitive pixel array is reduced, the cost of the module is reduced, and the structural size of the module is utilized efficiently. Furthermore, more internal space is saved for the electronic device adopting the biometric information recognition module of the embodiment of the present application.

[0033] On the other hand, for fingerprint recognition, when a relatively dry finger is placed on the surface of the display screen, the contact area between the dry finger and the surface of the display screen is small, and moreover, the adhesion effect between the dry finger skin and the display screen is also relatively poor. This results in not only a reduced contact area, but also a relatively weak signal of the vertically reflected light beam carrying fingerprint information received by the photosensitive pixel array for the signal that can only be received vertically. As a result, the recognition effect for dry fingers is poor, and recognition failures often occur. By adopting the biometric information recognition module of the embodiment of the present application, through the guiding effect of the optical channels with an included angle with the first straight line, a part of the inclined optical signals carrying biometric information from the recognition object that does not touch the screen can be incident on the photosensitive pixel array, so that more optical signals carrying biometric information are received in the photosensitive pixel array, effectively improving the recognition effect of dry fingers in fingerprint recognition. Description of the Drawings

[0034] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0035] Figure 1 is one of the structural schematic diagrams of a biological information recognition module provided by an embodiment of the present application;

[0036] Figure 2 is the second structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0037] Figure 3 is the third structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0038] Figure 4 is the fourth structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0039] Figure 5 is the fifth structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0040] Figure 6 is a schematic diagram of the included angle relationship of the optical channels of the biological information recognition module according to an embodiment of the present application;

[0041] Figure 7 is a structural schematic diagram from another perspective of a biological information recognition module provided by an embodiment of the present application;

[0042] Figure 8 is the sixth structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0043] Figure 9 is the seventh structural schematic diagram of a biological information recognition module provided by an embodiment of the present application;

[0044] Figure 10 is the structural schematic diagram of an optical sensor in a biological information recognition module provided by an embodiment of the present application;

[0045] Figure 11 is the structural schematic diagram of an electronic device provided by an embodiment of the present application.

[0046] Icons: 10 - optical path guiding layer; 101 - central region, 102 - peripheral region; 11 - optical channel; 110 - metal light-shielding layer; 111 - light-transmitting part; 12 - basic structure layer; 121 - collimating hole; 13 - microlens array; 131 - microlens unit; 14 - diaphragm layer; 140 - diaphragm hole; 20 - photosensitive pixel array; 201 - photosensitive pixel unit; 30 - display screen; 301 - biometric information recognition area; A20 - optical sensor; A1 - metal structure layer; A - photosensitive recognition area; D - distance between the upper surface of the display screen and the photosensitive pixel array; H - distance between two adjacent diaphragm layers; L - side length of the photosensitive pixel array; W - area of the biometric information recognition area; d1 - channel aperture on the side of the optical channel away from the photosensitive pixel array; d2 - channel aperture on the side of the optical channel close to the photosensitive pixel array; α - angle between the optical channel and the first straight line perpendicular to the surface of the photosensitive pixel unit 2. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0048] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0049] It should also be noted that unless otherwise clearly specified and limited, the terms "set", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0050] Biometric identification technology has been widely used in various terminal devices or electronic devices. Biometric identification technology includes but is not limited to fingerprint recognition, palm print recognition, vein recognition, iris recognition, face recognition, liveness recognition, anti-counterfeiting recognition and other technologies. Among them, fingerprint recognition generally includes optical fingerprint recognition, capacitive fingerprint recognition and ultrasonic fingerprint recognition. With the rise of full-screen technology, the fingerprint recognition module can be set in a local area or the entire area below the display screen to form an under-display optical fingerprint recognition; or, part or all of the optical fingerprint recognition module can be integrated into the display screen of the electronic device to form an in-display optical fingerprint recognition. The display screen can be an organic light emitting diode (OLED) display screen or a liquid crystal display (LCD). The fingerprint recognition method generally includes the steps of acquiring, preprocessing, feature extraction, feature matching and the like of the fingerprint image. Some or all of the above steps can be implemented by a traditional computer vision (CV) algorithm, or by a deep learning algorithm based on artificial intelligence (AI). Fingerprint recognition technology can be applied to portable or mobile terminals such as smartphones, tablets, gaming devices, as well as other electronic devices such as smart door locks, cars, bank ATMs, etc., for fingerprint unlocking, fingerprint payment, fingerprint attendance, identity authentication, etc.

[0051] The biometric information recognition module applied to the display screen usually needs to receive, record or analyze the reflected light carrying specific biometric information to realize the confirmation and identification of the individual to whom the specific biometric information belongs. For the display screen set on the biometric information recognition module, it itself needs to realize the required display function first. Therefore, the collection area that can be divided for the biometric information recognition under the screen is very limited. For the extraction of biometric information, it is required to have enough light beams carrying biometric information as a basis to obtain accurate identification information. On this basis, the more light beams carrying biometric information the module can obtain, the better its identification accuracy, anti-interference ability, and identification ability for counterfeiting can be improved accordingly. Therefore, how to fully obtain the reflected light beams carrying specific biometric information within this limited biometric information collection area, and process these reflected light beams to obtain as much specific biometric information as possible from the reflected light beams, so as to effectively improve the accuracy of confirming and identifying the person to whom the biometric information belongs, is an important problem that needs to be solved and improved in the specific application of the biometric information recognition module.

[0052] Based on this, the embodiment of the present application provides a biometric information recognition module.Figure 1 FIG. 1 is one of the structural diagrams of a biological information recognition module provided by an embodiment of the present application. As Figure 1 shown, the biological information recognition module includes an optical path guiding layer 10 and a photosensitive pixel array 20 arranged in sequence. The optical path guiding layer 10 includes a plurality of optical channels 11, and the photosensitive pixel array 20 includes a plurality of photosensitive pixel units 201. The light beams carrying biological information are incident on the corresponding photosensitive pixel units 201 after passing through the optical channels 11 respectively. Among them, the optical path guiding layer 10 includes a central region 101 and a peripheral region 102 surrounding the central region 101. There is an included angle between the optical channels 11 in the peripheral region 102 and a first straight line perpendicular to the surface of the photosensitive pixel array 20.

[0053] As Figure 1 shown, an optical path guiding layer 10 and a photosensitive pixel array 20 are arranged in sequence along the transmission direction of the light beam carrying biological information. The optical path guiding layer 10 includes a plurality of optical channels 11. Usually, the plurality of optical channels 11 are arranged in a matrix form on the optical path guiding layer 10. Each optical channel 11 can allow the light beam carrying biological information to pass through. The photosensitive pixel array 20 includes a plurality of photosensitive pixel units 201, and the plurality of photosensitive pixel units 201 are also arranged in a matrix form. Exemplarily, the photosensitive pixel array 20 can be a sensing device such as an optical sensor that can receive the light beam and analyze and process the biological information carried in the light beam. Each photosensitive pixel unit 201 of the photosensitive pixel array 20 can receive the incident light beam carrying biological information and perform corresponding signal processing. The surface of the photosensitive pixel array 20 is usually a plane, and the plane formed by arranging the plurality of photosensitive pixel units 201 in a matrix form serves as the photosensitive area of the photosensitive pixel array 20.

[0054] The light beams carrying biological information guided by the plurality of optical channels 11 are correspondingly incident on the photosensitive pixel units 201. As Figure 1 shown, a central region 101 and a peripheral region 102 surrounding the central region 101 are defined on the optical path guiding layer 10. Among them, there is an included angle α between the optical channels 11 in the peripheral region 102 and a first straight line perpendicular to the surface of the photosensitive pixel unit 201. That is, when the biological information recognition module of the embodiment of the present application is placed in the manner as Figure 1 shown, the optical channels 11 in the peripheral region 102 are in an inclined state. In this way, when the photosensitive area range of the photosensitive pixel array 20 remains unchanged, due to the inclined state of the optical channels 11, the incident light range of the light beam carrying biological information can be increased, that is, the photosensitive pixel array 20 can receive more light beams carrying biological information.

[0055] Among them, in the embodiment of the present application, the optical channel 11 is not limited to Figure 1In the form shown, the optical channel 11, as an optical element for transmitting and guiding the light beam carrying biological information to the photosensitive pixel array 20, can be implemented in various forms, and the embodiments of the present application do not make specific limitations here. As long as it can transmit the light beam carrying biological information and finally transmit it to the photosensitive pixel array 20. Moreover, in order to enable as many light beams carrying biological information as possible to be received by the photosensitive pixel array 20, the optical channels 11 in the peripheral area 102 are in an inclined state. In this way, for the biological information acquisition area of the display screen, the boundary of this area can be enlarged according to the inclined angle, so that the area of the biological information acquisition area is enlarged to a certain extent.

[0056] Among them, the biological information that the biological information recognition module of the embodiments of the present application is used to recognize may include fingerprint recognition on common handheld display devices such as mobile phones and tablet computers in the related art, and also include palmprint, palm vein or joint pattern recognition of the human palm used on other electronic devices. For another example, it may also include the recognition of information such as wrist veins and patterns in wearable devices. For the convenience of understanding and description, the following descriptions will mostly take fingerprint recognition on common handheld display devices in real life as an example.

[0057] In addition, in the embodiments of the present application, the division between the central area 101 and the peripheral area 102 is not specifically limited. The central area 101 at least includes the geometric center position of the entity structure on which the optical path guiding layer 10 depends, and the peripheral area 102 is arranged around the central area 101. Those skilled in the art can specifically set parameters such as the area ratio and other mutual relationships between the central area 101 and the peripheral area 102 according to needs. For example, the central area 101 can be reduced to almost only include the geometric center point, or the central area 101 can be enlarged so that a larger area including the geometric center is the central area 101. Similarly, the peripheral area 102 is arranged around the central area. The surrounding shape, surrounding layer number of the peripheral area 102, and whether other areas are set in addition to the central area 101 and the peripheral area 102 can all be specifically designed and set according to actual needs.

[0058] It should be noted that in the biological information recognition module of the embodiments of the present application, how the optical channels 11 in the central area 101 of the optical path guiding layer 10 are set and whether there is an inclination angle are not specifically limited here and are not conditions and constraints for restricting the implementation of this solution.

[0059] The bioinformation recognition module provided by the embodiment of the present application includes an optical path guiding layer 10 and a photosensitive pixel array 20 arranged in sequence. The optical path guiding layer 10 includes a plurality of optical channels 11, and the photosensitive pixel array 20 includes a plurality of photosensitive pixel units 201. The light beams carrying bioinformation are incident on the corresponding photosensitive pixel units 201 after passing through the optical channels 11 respectively. Among them, the optical path guiding layer 10 includes a central area 101 and a peripheral area 102 surrounding the central area 101. The optical channels 11 in the peripheral area 102 have an included angle α with a first straight line perpendicular to the surface of the photosensitive pixel array 20. Through the guiding action of the optical channels with an included angle with the first straight line, the light beams carrying bioinformation in a larger area range can be incident on the photosensitive pixel array. That is, without changing the area of the photosensitive pixel array 20, the bioinformation acquisition area of the display screen is increased, so that the bioinformation acquisition area is larger than the area of the photosensitive pixel array 20. Furthermore, the bioinformation recognition module of the embodiment of the present application can receive more optical signals, thereby obtaining more bioinformation. On the other hand, without increasing the bioinformation acquisition area of the display screen, the photosensitive area of the photosensitive pixel array 20 is effectively reduced, the volume of the photosensitive pixel array 20 is reduced, the cost of the module is reduced, and the structural size of the module is utilized efficiently. Furthermore, more internal space is saved for the electronic device adopting the bioinformation recognition module of the embodiment of the present application.

[0060] On the other hand, for fingerprint recognition, when a relatively dry finger is placed on the surface of the display screen, the contact area between the dry finger and the surface of the display screen is small, and moreover, the attachment effect between the dry finger skin and the display screen is also relatively poor. This results in not only a reduced contact area, but also a relatively weak signal of the vertical reflection light beam carrying fingerprint information received on the photosensitive pixel array 20 for the signal that can only be received vertically, leading to a poor recognition effect for dry fingers and often resulting in recognition failures. By adopting the bioinformation recognition module of the embodiment of the present application, through the guiding action of the optical channels 11 with an included angle α with the first straight line, a part of the inclined optical signals carrying bioinformation from the recognition object that has not contacted the screen can be incident on the photosensitive pixel array 20, so that more optical signals carrying bioinformation are received in the photosensitive pixel array 20, effectively improving the recognition effect of dry fingers in fingerprint recognition.

[0061] In an optional implementation manner of the embodiment of the present application, as Figure 1 shown, the optical path guiding layer 10 is a basic structure layer 12, and a plurality of collimation holes 121 are provided through the basic structure layer 12. The plurality of collimation holes 121 respectively serve as optical channels 11 to guide the light beams carrying bioinformation to the corresponding photosensitive pixel units 201.

[0062] As Figure 1As shown in the figure, the base structure layer 12 is made of conventional base materials. Since the main function of the base structure layer 12 is to form the structure of the collimating holes 121 and it doesn't need to play other roles itself, in the embodiments of the present application, the material of the base structure layer 12 is not specifically limited. Usually, the base structure layer 12 has a certain thickness. A plurality of through collimating holes 121 are formed in the base structure layer 12. By the setting position of the collimating holes 121 in the base structure layer 12 and the direction angle of the through setting, the optical path direction of the optical channel 11 (collimating holes 121) can be determined. Thus, when using the biometric information recognition module of this embodiment for fingerprint recognition under the display screen, when a finger is placed on the image acquisition area of the display screen, the emitted light beam irradiates the finger and is reflected. Since the fingerprint patterns on human fingers are different, the light beam irradiating and reflecting from the finger carries the information of valleys or ridges at specific positions on the fingerprint, or other fingerprint feature information for reflection. The reflected light beam carrying fingerprint information can be accurately guided by the collimating holes 121 to the photosensitive pixel unit 201 corresponding to the optical channel where the collimating holes 121 are located on the photosensitive pixel array 20.

[0063] Since the light beam passing through the collimating holes 121 needs to carry biometric information for effective recognition on the photosensitive pixel array 20, to avoid the mutual influence of light beams between adjacent collimating holes 121, for example, the base structure layer 12 can be made of black or dark materials, so that the light beam cannot propagate and interact within the base structure layer 12, and the light beam can only be transmitted through the collimating holes 121. Another example is that the material of the base structure layer 12 itself can also be a light-transmitting material, but a light-shielding film layer is formed on the inner wall of each collimating hole by coating, deposition or other means, so as to avoid the mutual cross influence of light beams between adjacent collimating holes 121.

[0064] In this way, still as Figure 1As shown, without changing the size of the biometric information collection area at the display screen, the inclined optical channels in the peripheral area 102 enable, when collecting fingerprints, not only the light beams carrying fingerprint information within the biometric information collection area to be perpendicularly incident on the optical path guiding layer 10 and have their fingerprint information extracted and recorded, but also, on the premise of including a biometric information collection area with the same area as the photosensitive area of the photosensitive pixel array 20, enable the outer edge of the biometric information collection area to be appropriately expanded, so that a part of the light beams that were originally not perpendicularly incident and were not far outside the biometric information collection area can be incident on the photosensitive area of the photosensitive pixel array 20 and be collected and recorded. This part of the light beams that could not be incident and collected originally enter the photosensitive pixel array 20 of the biometric information recognition module in this embodiment of the application, enabling the area of the photosensitive area of the photosensitive pixel array 20 to be reduced while receiving the same number of light beams carrying biometric information as before without increasing the area of the biometric information collection area of the display screen. From another perspective, it can also be understood that if the area of the photosensitive area of the photosensitive pixel array 20 is not reduced, the biometric information recognition module in this embodiment of the application can effectively increase the incident range and number of light beams carrying fingerprint information, thereby improving the accuracy and efficiency of fingerprint recognition.

[0065] This form of setting the collimation holes 121 on the base structure layer 12 as the optical channels 11. First, the material of the base structure layer 12 is selected to have strong structural stability and not easily react with other structures. Once the optical channels 11 are established with the collimation holes 121, the inclination angle usually does not easily change, and it is not easy to deform due to long time or artificial external factors. The base structure layer 12 usually has a certain thickness in the module. By using the thickness of the base structure layer 12, the collimation holes 121 can determine the direction of the light beams passing through the collimation holes 121 and the position where they exit to the specific photosensitive pixel unit 201 according to the position and inclination angle where they penetrate the base structure layer 12.

[0066] Figure 2 This is the second structural schematic diagram of a biometric information recognition module provided by an embodiment of the application. In an alternative implementation manner of an embodiment of the application, as Figure 2 shown, the optical path guiding layer 10 includes a microlens array 13 and at least one diaphragm layer 14 provided below the microlens array 13. A plurality of light-passing diaphragm holes 140 are distributed on the diaphragm layer 14. The microlens array 13 includes a plurality of microlens units 131. The microlens units 131 and the corresponding diaphragm holes 140 serve as the optical channels 11.

[0067] As Figure 2As shown, for each optical channel 11, it includes microlens units 131 for combining to form a microlens array 13, and at least one layer of aperture holes 140 located on the light-emitting side of the microlens units 131 and corresponding to the microlens units 131. The beam carrying biological information first passes through the microlens units 131. The microlens units 131 can converge and direct the beam to a certain extent. The act of converging the beam itself can converge as many beams as possible and direct them to the photosensitive pixel units 201. The converged beam then passes through the aperture holes 140 and is incident on the photosensitive pixel units 201. Since the beam carrying biological information needs to pass through the microlens units 131 and at least one aperture hole 140 in sequence, therefore, the optical channel 11 is formed here. The inclination angle of the optical channel 11 is the angle α between the line connecting the principal optical axis of the microlens unit 131 and the center of the aperture hole 140 and the first straight line.

[0068] In this embodiment, to adjust the included angle α of the optical channel 11, it can be achieved by adjusting the projection relationship between the microlens units 131 and the aperture holes 140. By adjusting the relative position relationship between the microlens units 131 and the aperture holes 140, the direction and angle of the included angle α of the optical channel 11 can be changed.

[0069] Figure 3 This is the third structural schematic diagram of the biological information recognition module according to the embodiment of the present application. As Figure 3 shown, in an alternative embodiment, as Figure 3 shown in the structural schematic diagram, the aperture layer 14 is provided with three layers. There is an aperture hole 140 on each of the three aperture layers 14 corresponding to each other, and together with the aforementioned microlens units 131, they form the optical channel 11.

[0070] The aperture layer 14 forming the optical channel 11 includes three layers. Among them, for the optical channel 11 to form an inclined result, it requires the microlens units 131 in the microlens array 13 and the aperture holes 140 on each layer of the multiple aperture layers 14. By adjusting the positional relationship between the microlens units 131 and the aperture holes 140 on each layer that correspond to each other to form the same optical channel 11, the inclination angle of the optical channel 11 is adjusted, that is, the included angle α between the optical channel 11 and the first straight line perpendicular to the surface of the microlens array 13.

[0071] Of course, Figure 3 The above is only an example for illustration purposes and cannot be considered as the only implementation form supported in this solution and the limitation of this solution. In the solution of the present application, the aperture layer 14 can also be provided with one layer, two layers, four layers, five layers, etc.

[0072] It should be noted that in another possible embodiment of the embodiment of the present application, the central axis of the optical channel 11 is a second straight line. For example, as Figure 3As shown, when the optical channel 11 needs to be formed by arranging and connecting nodes with more than two components, there is only one straight line between two points. However, when there are three or more points, it is difficult to ensure that the second straight line shown in Figure 3 is formed by sequential connection. For example, it may also be in a broken-line state (each two nodes form a straight line, and the slopes of the two straight lines are different, thus forming a broken line). Comparing the two, especially when the connection nodes of the optical channel 11 in this solution are more than three, of course, it is best that the central axis of the optical channel 11 formed by multiple nodes is a straight line. When the connecting lines of the nodes forming the central axis of the optical channel 11 are the second straight line, it means that the consumption of the light beam carrying biological information in the optical channel 11 is the smallest. That is to say, it can enable as many light beams carrying biological information as possible to enter the microlens array 13 and then be received by the photosensitive pixel units 201.

[0073] In an alternative embodiment, the microlens units 131 and the optical channels 11 are in one-to-one correspondence. That is, each optical channel 11 corresponds to one microlens unit 131. As Figure 2 shown, within the range of one optical channel 11, there is one microlens unit 131. The light beam carrying biological information passing through the same microlens unit 131 is incident on the aperture 140 of one optical channel 11 correspondingly and is guided to a corresponding photosensitive pixel unit 201, realizing the accurate corresponding reception of the light beams in various angular directions by the photosensitive pixel unit 201.

[0074] In another alternative embodiment, the corresponding relationship in the optical channel 11 can also be set such that multiple microlens units 131 correspond to one optical channel 11, or one microlens unit 131 corresponds to multiple optical channels 11 respectively. That is, within the range of each optical channel 11, there can be multiple microlens units 131. The multiple light beams carrying biological information passing through these multiple microlens units 131 are all incident on the aperture 140 of one optical channel 11 correspondingly and are guided to the photosensitive pixel unit 201 to make full use of the reception capacity of each photosensitive pixel unit 201. Or, one microlens unit 131 can also correspond to multiple optical channels 11 at the same time. Since the microlens unit 131 has a certain light beam converging ability, due to different incident angles of the light beams passing through the same microlens unit 131, there are also certain differences in the emerging angles. One microlens unit 131 corresponds to the apertures 140 of multiple optical channels 11 to guide the light beams carrying biological information to the same or different multiple photosensitive pixel units 201 respectively, thereby further improving the collection ability of the optical channel 11 for the light beams carrying biological information and reducing the loss of optical information during the transmission process.

[0075] In addition, the biometric information recognition module according to the embodiment of the present application does not uniquely define the correspondence relationship between the optical channels 11 and the photosensitive pixel units 201 in the photosensitive pixel array 20. By way of example, it can be set that each optical channel 11 directly corresponds to one photosensitive pixel unit 201 in the photosensitive pixel array 20, so that the light beam carrying biometric information passing through this optical channel 11 is uniquely incident on this photosensitive pixel unit 201. Alternatively, it can also be that the light exit of each optical channel 11 corresponds to multiple photosensitive pixel units 201, so that the light beams carrying biometric information exiting from the light exit of the optical channel 11 are respectively received by these multiple photosensitive pixel units 201. In addition, for another example, it can also be that multiple adjacent optical channels 11 commonly correspond to one photosensitive pixel unit 201, and this one photosensitive pixel unit 201 simultaneously receives the light beams carrying biometric information exiting from these multiple optical channels 11. The above are examples of some possible implementation manners. Those skilled in the art can accordingly make specific settings according to parameters such as the size of the photosensitive pixel unit 201 and the size relationship of the optical channels 11 in the specific implementation. The solutions cannot be exhausted, and other implementation manners that conform to the above correspondence relationship can also be covered by this solution.

[0076] Figure 4 FIG. 4 is a schematic structural diagram of the biometric information recognition module according to the embodiment of the present application. As Figure 4 shown, in an alternative embodiment, the optical path guiding layer 10 includes multiple diaphragm layers 14 arranged at intervals along the light transmission direction. Multiple light diaphragm holes 140 through which light beams can pass are distributed on the diaphragm layer 14. The light diaphragm holes 140 corresponding in position on the multiple diaphragm layers 14 together form at least a part of the optical channel 11.

[0077] It should be noted that the light diaphragm holes 140 corresponding in position on the multiple diaphragm layers 14 form at least a part of the optical channel 11, which includes two solutions. One is that the multiple diaphragm layers 14 themselves are components of the optical channel 11, and the multiple diaphragm layers 14 form the optical channel 11 in this embodiment without including other structures, that is, the structure as Figure 4 shown; the other is that the formation of the optical channel 11 is jointly formed by the multiple diaphragm layers 14 and other combined structures such as the microlens array 13 and the diaphragm layer 14, or the collimating holes 121 of the base structure layer 12. Therefore, the multiple diaphragm layers 14 are only a part of the entire optical channel 11, Figure 5 FIG. 5 is a schematic structural diagram of the biometric information recognition module according to the embodiment of the present application. As Figure 5 shown. The following will be described separately.

[0078] First, taking the light diaphragm holes 140 on the multiple diaphragm layers 14 as the entire optical channel 11 as an example. As Figure 4As shown, the optical channel 11 is formed by combining three diaphragm holes 140 corresponding to each other in position in three diaphragm layers 14. The central connection lines of the three diaphragm holes 140 corresponding to each other in position in the three diaphragm layers 14 are inclined straight lines. In this way, the formed optical channel 11 presents the same inclined state, and the light beam carrying the biometric feature is incident into the corresponding photosensitive pixel unit 201 after passing through the optical channel 11 formed by the three diaphragm holes 140 in sequence.

[0079] Secondly, take the case where the diaphragm holes 140 on the multi-layer diaphragm layer 14 are only a part of the optical channel 11 as an example. In this case, the optical channel 11 further includes the structure for forming the optical channel 11 of any of the foregoing, for example, the combination of the collimation hole 121, the microlens unit 131 and the diaphragm layer 14, or their combination, etc., so as to jointly form the optical channel 11. Specifically, as Figure 5 shown, the optical channel 11 is jointly formed by the collimation hole 121 on the basic structure layer 12 and three diaphragm holes 140 corresponding to each other in position in the three diaphragm layers 14. The light beam carrying the biometric feature needs to pass through the collimation hole 121 and the three diaphragm holes 140 in sequence when passing through the optical channel 11. Among them, the inclination angle of the collimation hole 121 is the same as the inclination angle of the central connection line between the three diaphragm holes 140 corresponding to each other in position on the three diaphragm layers 14, and the included angle α of the optical channel 11 is formed by the common connection line.

[0080] In addition, the optical channel 11 can also be formed by the cooperation between the foregoing other structures and multiple diaphragm holes 140. The composition principle is the same as the foregoing examples and will not be elaborated here.

[0081] In an optional implementation manner of the embodiment of the present application, as Figure 4 shown, the distance H between adjacent two diaphragm layers 14 is greater than or equal to 5 micrometers.

[0082] For the implementation manner in which the multi-layer diaphragm layers 14 are combined to form the optical channel 11, the projection position relationship between the diaphragm holes 140 on different levels of the diaphragm layers 14 is adjusted, so that the central connection lines of the multiple diaphragm holes 140 on different levels form the central axis of the optical channel 11. Therefore, if the distance H between adjacent two diaphragm layers 14 is too small, more diaphragm layers 14 need to be further provided, otherwise it is difficult to form an optical channel 11 with an optical path guiding function between two diaphragm layers 14 with a relatively short distance. Therefore, the distance H between adjacent two diaphragm layers 14 is greater than or equal to 5 micrometers to ensure that the corresponding diaphragm holes 140 in the two diaphragm layers 14 can form the guiding ability of the corresponding light beam.

[0083] In an optional implementation manner of the embodiment of the present application, the angle of the included angle α of the optical channel 11 gradually increases from the central region 101 to the peripheral region 102.

[0084] Taking the optical channel 11 composed of three diaphragm holes 140 corresponding to the positions in the three diaphragm layers 14 as an example, as Figure 4 shown, Figure 4 there is an angle α between the principal optical axis of each optical channel 11 and the first straight line perpendicular to the photosensitive pixel array 20. This angle α can reflect the tilt angle of the light beam passing through the optical channel 11 reaching the photosensitive pixel unit 201. Among them, the angle α of the optical channel 11 corresponding to the central region 101 of the optical path guiding layer 10 is smaller, pointing from the central region 101 to the peripheral region 102, and the angle of this angle α gradually increases. The smaller the angle α, the higher the perpendicularity of the light beam reaching the photosensitive pixel unit 201 through the optical channel 11. The perpendicularity of the light beam received by the photosensitive pixel unit 201 corresponding to the central region 101 of the optical path guiding layer 10 is relatively high, and the biometric information it receives has better acquisition and analysis value. Pointing to the peripheral region 102, the angle of the angle α gradually increases. Although the perpendicularity of the light beam decreases, it can include the biometric information within as large a biometric information acquisition area as possible, improving the acquisition range of biometric information. Overall, this structure of the optical channel 11 can enable the photosensitive pixel array 20 to obtain better light beam signals, so as to analyze and obtain more comprehensive and accurate biometric information.

[0085] In an optional implementation manner of the embodiment of the present application, there is also an angle α between the optical channel 11 in the central region 101 and the first straight line perpendicular to the surface of the photosensitive pixel array 20. That is, under the condition that the angle α of the optical channel 11 satisfies the above conditions, where the angle α points from the central region 101 to the peripheral region 102 and the angle value of the angle α gradually increases, the optical channel 11 in the central region 101 also has an angle, for example, 0.1°, 0.05°, etc.

[0086] Or, in another optional implementation manner of the embodiment of the present application, as Figure 4As shown, the optical channel 11 in the central region 101 is parallel to the first straight line perpendicular to the surface of the photosensitive pixel array 20. That is, the light beam carrying biological information that passes through the optical channel 11 in the central region 101 and reaches the photosensitive pixel unit 201 is incident on the photosensitive pixel unit 201 at a perpendicular angle. The light beam carrying biological information passing through the optical channel 11 in the central region 101 is usually located near the center of the biological information acquisition area. Therefore, there is usually no need to expand the acquisition area. As mentioned in the previous example, when the light beam carrying biological information is incident on the photosensitive pixel unit 201, the higher the perpendicularity between the light beam and the photosensitive pixel unit 201, the more accurate the biological information received by the photosensitive pixel unit 201, and it can reduce the influence of reflection, glare, etc. on the photosensitive pixel unit 201's reception and analysis of optical information. This will not be elaborated here. That is to say, in this way, for the central region 101, the optical channel 11 adopts the smallest possible angle α (the extreme state is that the angle α is 0°, that is, it can be understood that there is no angle α at this time, and the optical channel 11 is parallel to the first straight line) to ensure the full and accurate acquisition of biometric information. For the peripheral region 102, the optical channel 11 is set to have an angle α with a certain angle, so as to effectively expand the area of the biological information acquisition area that can be received by the photosensitive area of the photosensitive pixel array 20, thereby obtaining a wider range of biometric information to improve the recognition accuracy.

[0087] In an optional implementation manner of the embodiment of the present application, along the direction from the center to the edge of the optical path guiding layer 10, the angle α of the multiple optical channels 11 in the peripheral region 102 gradually increases.

[0088] Still referring to Figure 4 , Figure 4 the optical channels 11 corresponding to the peripheral region 102 in

[0089] include multiple ones. The angles α of these multiple optical channels 11 are different, and along the direction from the center to the edge of the optical path guiding layer 10, the angles α of these multiple optical channels 11 gradually increase, that is, the angle α of the optical channel 11 closer to the edge is larger.

[0089] On this basis, in an optional implementation manner of the embodiment of the present application, the included angle α of the multiple optical channels 11 in the peripheral region 102 gradually increases with a fixed increase rate along the direction from the center to the edge of the optical path guiding layer 10.

[0090] For example, Figure 6 is a schematic diagram of the angle relationship of the optical channels 11 of the biometric information recognition module in the embodiment of the present application. As Figure 6 shown, along Figure 6The direction indicated by the double arrow, that is, the direction from the center of the optical path guiding layer 10 towards the edge, the angle α between the optical channel 11 and the first straight line perpendicular to the surface of the photosensitive pixel array 20 shows a gradually increasing trend. In this example, this increasing relationship has a fixed increase. For example, when the optical channel 11 in the central region 101 is parallel to the first straight line perpendicular to the surface of the photosensitive pixel array 20, that is, when there is no angle α for the optical channel 11 in the central region 101, it can be understood that the angle α of the optical channel 11 in the central region 101 is 0. Assuming the increase is 2°, then along the direction indicated by the double arrow, the angle α of the first optical channel 11 adjacent to the optical channel 11 in the central region 101 is 2°, the angle α of the second optical channel 11 is 4°, the angle α of the third optical channel 11 is 6°, and so on, until the angle α of the optical channel 11 at the outermost edge of the outer region 102 is the maximum angle among all the angles. It can also be understood that in this example, the optical channel 11 is along the direction from the center of the optical path guiding layer 10 towards the edge, and the angle α gradually increases step by step with a fixed increase.

[0091] For example, in an implementation manner, the maximum angle α of the optical channel 11 at the outermost edge of the outer region 102 is 45°, and there are 300 * 300 photosensitive pixel units on the photosensitive pixel array 20. Then, corresponding to each photosensitive pixel unit 201, the fixed increase of the angle α of the optical channel 11 can be set to 45 / 150 = 0.25, that is, along the direction from the center of the optical path guiding layer 10 towards the edge, the fixed increase of the angle α between two adjacent optical channels 11 is 0.25°.

[0092] Of course, the step fixed value in the above example is 2°. In fact, for a precise biological information recognition module, to accurately obtain the biological information carried in the light beam and perform recognition and confirmation, the number of optical channels 11 is very large and they are set densely. In actual settings, the step angle increase will obviously be much smaller than 2°. Generally, the smaller the step angle increase is set, after the photosensitive pixel array 20 receives the light beam carrying biological information, the difficulty of splicing and analyzing the biological information received by each photosensitive pixel unit 201 can be effectively reduced, thereby reducing the loss of biological information and improving the integrity of information acquisition and the accuracy of biological information recognition. Therefore, in an optional embodiment of the embodiment of the present application, the fixed increase is selected between 0.05° and 2°.

[0093] In another optional implementation manner of the embodiment of the present application, along the direction from the center of the optical path guiding layer 10 towards the edge, the angles α of the multiple optical channels 11 in the outer region 102 gradually increase with a varying increase.

[0094] Still taking Figure 6 as an example, in this implementation manner, along Figure 6In the direction of the double arrow, the included angle α of the optical channel 11 gradually increases with a changing increase rate, that is, the angular difference between the included angles α of two adjacent optical channels 11 is not equal. For example, 0°, 1°, 3°, 6°... Of course, in order to make the image formed by the light beams carrying biological information complete and easy to splice, even if a changing increase rate is adopted, certain regularity should be satisfied as much as possible, and the angular difference between any two adjacent optical channels 11 should be avoided from being too large to cause information loss in this part.

[0095] Moreover, as Figure 6 shown, usually, the perpendicularity of the optical channel 11 near the central region 101 is relatively high. Taking fingerprint recognition as an example, in the light beams passing through the optical channel 11 near the central region 101, the fingerprint information carried is at the central position of the entire finger. Relatively speaking, these light beams carry relatively rich fingerprint information. However, the closer to the edge of the peripheral region 102, the fingerprint information carried in the light beams passing through the optical channel 11 is at the edge position of the finger. It is more difficult for these light beams to carry fingerprint information itself, and the path through the optical channel 11 is also longer. Therefore, relatively speaking, there are more problems such as less fingerprint information carried and fingerprint information loss in this part of the light beams. Therefore, when the included angle α of the optical channel 11 gradually increases with a changing increase rate along Figure 6 the direction of the double arrow, the changing increase rate can be selected in a way that gradually decreases along the direction from the center to the edge of the optical path guiding layer 10.

[0096] Exemplarily, the included angle α of the optical channel 11 in the central region is 1°, the included angle α of the first optical channel 11 along the double-arrow direction is 4°, that is, the change value therebetween is 3°. The included angle α of the next optical channel 11 is 2°, and the change value is 2°. The included angle α of the next optical channel 11 is 1°, and the change value is 1°, and so on. In this way, the closer to the edge of the biological information collection area of the display screen, the denser the collection light beams for biological information, thereby effectively compensating for the problem that the light beams at the edge of the peripheral area 102 carry less fingerprint information, so that the fingerprint information collected by the photosensitive area of the photosensitive pixel array 20 has better continuity and integrity. It should be noted that in an alternative implementation manner of the embodiment of the present application, the included angle α of the optical channel 11 cannot be arbitrarily enlarged. As mentioned in the foregoing description, when the included angle α of the optical channel 11 is too large, the biological information carried by the light beam passing through the optical channel 11 will suffer great loss during transmission, and the optical path passed by the light beam during transmission is also relatively long. When received by the photosensitive pixel unit 201, the amount of information that can be extracted and used for subsequent calculation and recognition is very small. Therefore, exemplarily, the included angle α of the optical channel 11 in the peripheral area 102 can be limited to be less than or equal to 60°. That is, no matter how the multiple optical channels 11 of the entire optical path guiding layer 10 are divided and arranged, the maximum value of the included angle α of the optical channel 11 should not exceed 60°, so as to ensure the effective reception rate of the biological information received by the photosensitive pixel unit 201 after expanding the biological information collection area.

[0097] In an implementation manner of the embodiment of the present application, the maximum value of the included angle α of the optical channel 11 in the peripheral area 102 should not exceed 10°-45°. For example, the maximum value of the included angle α of the optical channel 11 in the peripheral area 102 is 10°, 25°, 30°, 45°, etc. Limiting the maximum value of the included angle α within this range can better ensure the effective reception rate of the biological information received by the photosensitive pixel unit 201 after expanding the biological information collection area and the biological information recognition effect of the biological information recognition module of the embodiment of the present application.

[0098] Figure 7 It is a schematic structural diagram of another perspective of a biological information recognition module provided by an embodiment of the present application. In another alternative implementation manner of the embodiment of the present application, the included angles α of the multiple optical channels 11 in the central region 101 are the same, and / or the peripheral area 102 surrounding the central region 101 includes multiple, and the included angles α of the multiple optical channels 11 in the same peripheral area 102 are the same.

[0099] First, by Figure 7It can be seen that a large number of optical channels 11 are arranged in an array on the optical path guiding layer 10, which are used to transmit the light beams carrying biological information at various positions respectively. The optical path guiding layer 10 includes a central region 101 and three mutually nested peripheral regions 102 surrounding the central region 101. Equivalently, each peripheral region 102 is a ring, and the multiple peripheral regions 102 are nested and arranged one by one around. In the central region 101, there are multiple optical channels 11, and the angles α of all the optical channels 11 within the range of the central region 101 are the same. For example, the angles α of all the optical channels 11 within the range of the central region 101 are all 1°, or the angles α are all 0°, etc.

[0100] When there are multiple peripheral regions 102 surrounding the central region 101, the angles α of the optical channels 11 in different peripheral regions 102 can be set to be different, but the angles α of the multiple optical channels 11 in the same peripheral region 102 are the same. Equivalently, when there are multiple peripheral regions 102, each peripheral region 102 serves as a change gradient, and the optical channels 11 within each change gradient maintain the same angle α. There are three circles of peripheral regions 102 formed outside the central region 101. For each circle of peripheral regions 102, there are multiple optical channels 11 included therein. Figure 7 This is only a schematic diagram. In fact, in each annular peripheral region 102, there are multiple optical channels 11 arranged regularly in multiple circles. For example, for the first circle of peripheral region 102 closest to the central region 101, the angles α of all the optical channels 11 within this peripheral region 102 are all 2°. For the second circle of peripheral region 102, the angles α of all the optical channels 11 within this peripheral region 102 are all 3°, and so on.

[0101] In this way, on the one hand, it makes the angles α of the optical channels 11 of the entire biological information recognition module have a gradient change relationship. On the other hand, through the regional division of the central region 101 and the peripheral regions 102, all the optical channels 11 can be divided into regions and the angles are set, which can be quantitatively designed and produced, facilitating production and processing, simplifying the difficulty and requirements of the preparation process, and also facilitating the calculation difficulty of subsequent data processing. Moreover, Figure 7 It can be seen that the photosensitive area of the photosensitive pixel array 20 (i.e., the photosensitive receiving surface of the photosensitive pixel array 20, Figure 7(which can be understood as the view range of the photosensitive pixel array 20) The size can be set to be smaller than the size of the optical path guiding layer 10. Through the configuration of the included angle α of the optical channels 11 in each area on the optical path guiding layer 10, the reception of a light beam with a photosensitive area larger than that of the photosensitive pixel array 20 is achieved. In an alternative implementation manner of the embodiment of the present application, the center of the central area 101 coincides with the center of the peripheral area 102; and / or, in an alternative implementation manner of the embodiment of the present application, the peripheral area 102 is in a circular ring shape, a square ring shape, a triangular ring shape or an irregular ring shape.

[0102] As Figure 7 shown, it can be set that the center of the central area 101 coincides with the center of the peripheral area 102. When the peripheral area 102 is in a circular ring shape, it is equivalent to the central area 101 and the peripheral area 102 being concentric. In this way, it is convenient for quantitative design and production, convenient for production and processing, simplifies the difficulty and requirements of the preparation process, and also facilitates the calculation difficulty of subsequent data processing.

[0103] In an alternative implementation manner of the embodiment of the present application, the peripheral area 102 is in a circular ring shape with the center of the central area 101 as the center of the circle, or, as Figure 7 shown, the peripheral area 102 is in a square ring shape with the center of the central area 101 as the center. For another example, it can also be a square ring shape, a triangular ring shape or an irregular ring shape.

[0104] The outer edge shape of the central area 101 and the ring shape of the peripheral area 102 can be designed and set according to actual needs, not limited to the above examples, and the present application does not make specific limitations in this regard.

[0105] If the peripheral area 102 surrounding the central area 101 is regarded as a whole, the peripheral area 102 can include at least two sub-areas, a first sub-area and a second sub-area located outside the first sub-area. The included angle α of the optical channels 11 in the first sub-area is set to be greater than the included angle α of the optical channels 11 in the second sub-area. Moreover, the included angles α of the multiple optical channels 11 in the first sub-area can be set to be the same angle, and the included angles α of the multiple optical channels 11 in the second sub-area can be set to be another same angle.

[0106] In an alternative embodiment of the present application, the included angle α of the optical channel 11 is related to the distance between the optical channel 11 and the center of the optical path guiding layer 10. The greater the distance, that is, the closer to the edge of the optical path guiding layer 10, the greater the included angle α of the optical channel 11. If this distance is divided into equal interval segments, then from the center of the optical path guiding layer 10 pointing to the edge, the included angle of the optical channel 11 corresponds to an interval segment of the distance, and moreover, the angles of the included angles α of the optical channels 11 falling within the same distance interval segment are the same. By way of example, taking Figure 7Taking the peripheral region 102 shown in the figure as an example of a square ring centered on the center of the central region 101, the width of each layer of the peripheral region 102 can be 1 pixel, and 1 pixel corresponds to a photosensitive pixel unit 201. That is, the optical channels 11 in each layer of the peripheral region 102 correspond to the photosensitive pixel units 201 in a ring on the photosensitive pixel array 20.

[0107] In an alternative implementation manner of the embodiment of the present application, in the longitudinal section passing through the central region 101, a plurality of optical channels 11 are arranged in a fan shape with the central region 101 as the center.

[0108] Taking Figure 6 as an example, it is a longitudinal section view of a biological information recognition module according to an embodiment of the present application passing through the central region 101. In this section direction, a plurality of optical channels 11 are centered on the central region 101, and their inclination directions and angles are such that the whole presents a fan-shaped arrangement.

[0109] This way can receive and direct the light beam carrying biological information reflected by the upper display screen over a larger range to the photosensitive pixel array 20 for reception, so that as much biological information as possible is received on the photosensitive pixel array 20, facilitating subsequent calculation and processing and improving the accuracy of biological information recognition. As long as it can be presented in a fan-shaped arrangement, the image acquisition area corresponding to the photosensitive pixel array 20 must be in an expanded state of fan-shaped divergence, thereby avoiding the situation where the inclination directions of the optical channels 11 on the opposite sides of the central region 101 are the same, resulting in an overall offset. This situation only causes the position of the image acquisition area to shift relative to the photosensitive area, and does not actually form an expansion of the image acquisition area.

[0110] Figure 8 FIG. 6 is a schematic structural diagram of a biological information recognition module provided by an embodiment of the present application. In an alternative implementation manner of the embodiment of the present application, for at least a part of the optical channels 11, the channel aperture d1 on the side away from the photosensitive pixel array 20 is greater than or equal to the channel aperture d2 on the side close to the photosensitive pixel array 20.

[0111] For example, taking the collimating hole 121 in the basic structural layer 12 of the optical channel 11 as an example for illustration, as Figure 8As shown, the collimating hole 121 has an overall inverted trapezoidal structure. The channel aperture d1 on the side of the optical channel 11 away from the photosensitive pixel array 20 is larger than the channel aperture d2 on the side close to the photosensitive pixel array 20. In this way, when the light beam carrying biological information is reflected by the display screen and enters the collimating hole 121 from above, due to the larger aperture value of d1, as many light beams as possible can enter the optical channel 11. After being guided and transmitted through the optical channel 11, the outlet d2 of the optical channel 11 has a smaller aperture value, so that the light beam output from the collimating hole 121 can accurately and directly enter the corresponding photosensitive pixel unit 201.

[0112] On this basis, in an optional implementation manner of the embodiment of the present application, the channel aperture of the optical channel 11 can be further set to gradually increase along the direction in which the light beam enters the photosensitive pixel unit 201. That is, the change in the channel aperture increases in a uniform manner along the direction in which the light beam enters the photosensitive pixel unit 201. This way of gradually increasing the channel aperture has better light guiding ability and reduces light loss during the light guiding process compared to the stepped increase method.

[0113] In an optional implementation manner of the embodiment of the present application, the central axis of the optical channel 11 is a second straight line. In the longitudinal section passing through the second straight line, the angles between the two boundaries of at least part of the optical channel 11 and the first straight line are different.

[0114] Defining the central axis of the optical channel 11 as the second straight line, in the longitudinal section passing through the second straight line, for at least a part of the optical channel 11, the angles between the two boundaries of the optical channel 11 (that is, the opposite sides of the optical channel 11, which can be defined as the first boundary angle and the second boundary angle respectively) and the first straight line are different. That is, the longitudinal section of the optical channel 11 can be an asymmetric structure. For example, the longitudinal section is a right trapezoid.

[0115] On this basis, for example, for at least part of the optical channel 11, the first boundary angle of the optical channel 11 is smaller than the second boundary angle. The first boundary angle is the angle between the boundary of the optical channel 11 close to the central region 101 and the first straight line, and the second boundary angle is the angle between the boundary of the optical channel 11 away from the central region 101 and the first straight line. That is to say, when the first boundary angle and the second boundary angle are different, the inclined direction needs to be as Figure 8 shown in, towards the center, that is, the first boundary angle close to the central region 101 is smaller, and the second boundary angle away from the central region 101 is larger, so as to satisfy the collection of the edge light beams used to expand the image acquisition area in an inclined direction.

[0116] Figure 9 It is the seventh structural schematic diagram of a biological information recognition module provided by the embodiment of the present application. In an optional implementation manner of the embodiment of the present application, asFigure 7 As shown in the figure, the biological information recognition module of the embodiment of the present application further includes an optical sensor A20, and the photosensitive pixel array 20 is integrated in the photosensitive recognition area A of the optical sensor A20.

[0117] The optical sensor A20 is a semiconductor packaging chip with the photosensitive ability of optical signals, capable of performing photoelectric conversion on the sensed optical signals, and also converting the characteristic information carried in the optical signals into optical signals for recording and recognition, such as CCD (Charge Coupled Device), CMOS (Complementary Metal Oxide Semiconductor Device), MEMS (Micro-Electro-Mechanical Sensing Chip), etc. As a packaging chip, the optical sensor A20 is applied in the biological information recognition module of the embodiment of the present application, and the photosensitive pixel array 20 can be integrated in the photosensitive recognition area A of the optical sensor A20. The packaging structure has a compact structure, strong working stability, good sensing ability, etc. While ensuring the recognition ability, it has a good auxiliary effect on the miniaturization of the module structure and the adaptability to the environment.

[0118] In an optional implementation manner of the embodiment of the present application, the optical sensor A20 includes a metal structure layer A1, the optical path guiding layer 10 further includes a metal light shielding layer 110, and the metal light shielding layer 110 multiplexes the metal structure layer A1 on the optical sensor A20; at least one layer of the metal light shielding layer 110 is correspondingly provided with a light transmitting portion 111 to form a light channel 11.

[0119] Figure 10 It is a schematic structural diagram of an optical sensor in a biological information recognition module provided by an embodiment of the present application. As Figure 10 shown, in the hierarchical structure of the optical sensor A20, there is a metal structure layer A1. The metal structure layer A1 is used to prepare corresponding metal patterns in the optical sensor A20 to realize the functions required by the optical sensor A20. In the biological information recognition module, the optical path guiding layer 10 includes a metal light shielding layer 110 formed on the metal layer. Since they are both made of metal, the metal light shielding layer 110 can multiplex the metal structure layer A1 on the optical sensor A20, that is, on the metal structure layer A1, use its existing metal patterns or further form the metal patterns required for the metal light shielding layer 110 on the basis of not affecting the original function realization, such as the light transmitting portion 111, so as to multiplex the metal structure layer A1 as the metal light shielding layer 110 for use.

[0120] Among them, in Figure 10, a specific implementation of multiplexing two metal structure layers A1 as two metal light shielding layers 110 in the optical path guiding layer 10 is shown. In an optional implementation of the embodiment of the present application, the multiplexed metal structure layer A1 can also be selected to include 2-5 layers. In this way, most or all of the metal light shielding layers 110 can be set to multiplex the metal structure layer A1 on the optical sensor A20, thereby further effectively reducing the structural volume.

[0121] Another aspect of the embodiments of the present application further provides an electronic device, Figure 11 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application, including a display screen 30, and a biometric information recognition module as any one of the above items arranged below the display screen 30.

[0122] The user places the carriers with individual biometric features such as fingers and palms in the image collection area of the display screen 30. Taking the fingerprint recognition under the screen as an example, the light beam irradiated and reflected on the fingerprint path of the finger can carry the texture features of the irradiated finger position as fingerprint information. The light beam carrying the fingerprint information is guided and transmitted by the optical path guide layer 10 in the biometric information recognition module and then enters the photosensitive pixel array 20. Through the guiding effect of the optical path guide layer 10, the light beam carrying biometric information in a larger area can be incident on the photosensitive pixel array 20, so that the electronic device of the embodiment of the present application can receive more light signals reflected from the fingerprint, thereby obtaining more fingerprint information. Without increasing the image collection area of the display screen 30, the pixel collection range of the photosensitive pixel array 20 is effectively increased, and the recognition accuracy of biometric information recognition is improved. At the same time, the manufacturing cost of the electronic device can be reduced, and the structural size of the module is efficiently utilized, saving more internal space for the electronic device.

[0123] In an optional implementation of the embodiment of the present application, a biometric information recognition area 301 for acquiring a light beam carrying biometric information is preset on the display screen 30, and the area of the biometric information recognition area 301 is larger than the light beam receiving area of the photosensitive pixel array 20 in the biometric information recognition module.

[0124] Taking a width direction as an example, W is the area of the biometric information identification area 301, and W satisfies:

[0125] W=(L+D*tanα) 2 ; (1)

[0126] Wherein, L is the side length of the photosensitive pixel array 20, D is the distance between the upper surface of the display screen 30 and the photosensitive pixel array 20, and α is the angle between the light channel 11 and the first straight line perpendicular to the surface of the photosensitive pixel unit 201.

[0127] According to formula (1) and the attachedFigure 11 It can be seen that in this width direction, through the guiding effect of the optical path guiding layer 10, the light beam carrying biological information within a larger width range can be made to be incident on the photosensitive pixel array 20. Similarly, in other width directions, through the guiding effect of the optical path guiding layer 10, the light beam carrying biological information within a larger width range can also be made to be incident on the photosensitive pixel array 20. Therefore, the area W of the biological information recognition area 301 is larger than the light beam receiving area of the photosensitive pixel array 20 in the biological information recognition module. That is, with the existing area of the biological information recognition area 301 remaining unchanged, by adopting the biological information recognition module of the embodiment of the present application, it is possible to reduce the area of the photosensitive recognition area A on the optical sensor A20 while ensuring the acquisition and recognition of biological information, thereby reducing costs and contributing to the miniaturization of the electronic device, leaving room for the internal structure design and planning of the electronic device.

[0128] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A biological information recognition module, characterized in that, It includes an optical path guiding layer and a photosensitive pixel array arranged in sequence. The optical path guiding layer includes a plurality of optical channels, and the photosensitive pixel array includes a plurality of photosensitive pixel units. The light beams carrying biological information are incident on the corresponding photosensitive pixel units after passing through the optical channels respectively. Among them, the optical path guiding layer includes a central region and a peripheral region surrounding the central region. There is an included angle between the optical channels in the peripheral region and a first straight line perpendicular to the surface of the photosensitive pixel array. Along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase; the biological information is fingerprint information.

2. The biometric information recognition module according to claim 1, wherein Along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase with a fixed increment.

3. The biometric information recognition module according to claim 2, wherein The fixed increment is 0.05° - 2°.

4. The biometric information recognition module according to claim 1, wherein Along the direction from the center to the edge of the optical path guiding layer, the included angles of the plurality of optical channels in the peripheral region gradually increase with a varying increment.

5. The biometric information recognition module according to claim 4, wherein Along the direction from the center to the edge of the optical path guiding layer, the varying increment gradually decreases.

6. The biometric information recognition module according to any one of claims 1-5, characterized in that There is an included angle between the plurality of optical channels in the central region and the first straight line and the included angles are the same, and / or, there are a plurality of peripheral regions surrounding the central region. The included angles between the plurality of optical channels in the same peripheral region and the first straight line are the same.

7. The biometric information recognition module according to claim 6, wherein The optical channels within the width range of one peripheral region correspond to 1 - 10 photosensitive pixel units in the photosensitive pixel array.

8. The biometric information recognition module according to any one of claims 1-5, characterized in that The center of the central region coincides with the center of the peripheral region; and / or, the peripheral region is in a circular ring shape, a square ring shape, a triangular ring shape or an irregular ring shape.

9. The biometric information recognition module according to any one of claims 1-5, characterized in that In the longitudinal section passing through the central region, the plurality of optical channels are arranged in a fan shape with the central region as the center.

10. The biometric information recognition module according to any one of claims 1-5, characterized in that, For at least some of the optical channels, the channel aperture on the side away from the photosensitive pixel array is greater than or equal to the channel aperture on the side close to the photosensitive pixel array.

11. The biometric information recognition module according to claim 10, wherein, The channel aperture of the optical channel gradually increases along the direction of the light beam incident on the photosensitive pixel unit.

12. The biometric information recognition module according to claim 10, wherein The central axis of the optical channel is a second straight line. In the longitudinal section passing through the second straight line, the included angles between the two boundaries of at least some of the optical channels and the first straight line are different.

13. The biometric information recognition module according to claim 12, wherein For at least some of the optical channels, the first boundary included angle of the optical channel is less than the second boundary included angle. The first boundary included angle is the included angle between the boundary of the optical channel close to the central region and the first straight line, and the second boundary included angle is the included angle between the boundary of the optical channel away from the central region and the first straight line.

14. The biometric information recognition module according to any one of claims 1-5, characterized in that, There is an included angle between the optical channels in the central region and the first straight line, or the optical channels in the central region are parallel to the first straight line.

15. The biometric information recognition module according to any one of claims 1-5, characterized in that, A plurality of collimation holes are provided through the optical path guiding layer, and the plurality of collimation holes respectively serve as optical channels.

16. The biometric information recognition module according to any one of claims 1-5, characterized in that, The optical path guiding layer includes a microlens array and at least one diaphragm layer disposed below the microlens array. A plurality of diaphragm holes through which light beams can pass are distributed on the diaphragm layer. The microlens array includes a plurality of microlens units. The microlens units and the diaphragm holes corresponding to the microlens units serve as the optical channels.

17. The biometric information recognition module according to any one of claims 1-5, characterized in that, The optical path guiding layer includes multiple diaphragm layers spaced along the light transmission direction. A plurality of diaphragm holes through which light beams can pass are distributed on the diaphragm layer. The diaphragm holes corresponding in position on the multiple diaphragm layers form at least a part of the optical channel.

18. The biometric information recognition module according to claim 16 or 17, characterized in that, The distance between two adjacent diaphragm layers is greater than or equal to 5 micrometers.

19. The biometric information recognition module according to any one of claims 1-5, characterized in that, The included angle of the optical channels in the peripheral area is less than or equal to 60°.

20. The biometric information recognition module according to claim 19, characterized in that, The included angle of the optical channels in the peripheral area is less than or equal to 45°.

21. The biometric information recognition module according to any one of claims 1-5, characterized in that, It further includes an optical sensor, and the photosensitive pixel array is integrated in the photosensitive recognition area of the optical sensor.

22. The biometric information recognition module according to claim 21, wherein The optical sensor includes a metal structure layer, and the optical path guiding layer further includes a metal light shielding layer. The metal light shielding layer multiplexes the metal structure layer on the optical sensor; a light transmissive part is correspondingly arranged on at least one metal light shielding layer to form an optical channel.

23. The biometric information recognition module according to claim 22, wherein, The multiplexed metal structure layer includes 2 to 5 layers.

24. An electronic device, characterized in that, It includes a display screen and a biometric information recognition module as described in any one of claims 1 - 23 disposed below the display screen.

25. The electronic device according to claim 24, wherein, A biometric information recognition area for obtaining a light beam carrying biometric information is preset on the display screen, and the area of the biometric information recognition area is larger than the light beam receiving area of the photosensitive pixel array in the biometric information recognition module.

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