A laser light source, an image acquisition device and an electronic device

Abstract

The application provides a laser light source, an image acquisition device and an electronic device, relates to the field of biometric identification technology, and when the position of the light emitting element in the light emitting group is set, at least two light emitting elements of the light emitting group in the laser light source are mixedly distributed, the light emitting elements of different light emitting groups are doped together, and finally a distribution characteristic is formed: at least two light emitting elements belonging to the same light emitting group are distributed with the light emitting elements of other light emitting groups. In this way, the mixedly distributed light emitting groups can form a higher overlapping degree of the illumination area, and when the optical film layer is set, the mixedly distributed light emitting groups can correspond to positions with different transmittances in the optical film layer, thereby weakening the influence of the transmittance difference of different positions of the optical film layer on the light intensity, and improving the difference in the illumination effect of the linearly polarized light emitted by different light emitting groups in the target area.

Description

Technical Field

[0001] This application relates to the field of biometric technology, and more specifically, to a laser light source, an image acquisition device, and an electronic device. Background Technology

[0002] With the development of portable terminal devices, such as mobile phones, the application of biometric technology is becoming increasingly widespread and in-depth. Taking electronic devices as an example, fingerprint recognition, fingerprint verification, and facial recognition are increasingly used in screen wake-up of display devices and identity authentication steps in various programs, improving the security of display devices and the flexibility of their use.

[0003] Current solutions for facial recognition based on polarization-based 3D imaging technology require laser arrays for illumination, and these arrays need to emit linearly polarized light with different polarization directions. In current laser array arrangements, lasers emitting linearly polarized light with the same polarization direction are concentrated in the same area, while lasers emitting linearly polarized light with different polarization directions are distributed relatively independently in different areas.

[0004] In this arrangement, the linearly polarized light emitted by lasers distributed in different areas will have different illumination effects in the area where the face is located. This difference will increase the difficulty of polarized 3D imaging and is not conducive to face recognition. Utility Model Content

[0005] The purpose of this application is to provide a laser light source, an image acquisition device, and an electronic device, addressing the shortcomings of the prior art described above.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In one aspect of this application, a laser light source is provided, comprising at least two light-emitting groups; the linearly polarized light emitted by any two light-emitting groups has different polarization directions; the light-emitting group includes light-emitting elements, and the light-emitting elements of at least two light-emitting groups are mixed and distributed with each other.

[0007] Optionally, all the light-emitting elements of the laser light source are arranged in rows and columns to form a light-emitting array; in the row direction and / or column direction of the light-emitting array, at least one light-emitting element from another light-emitting group is disposed between two adjacent light-emitting elements in the same light-emitting group.

[0008] Optionally, in the light-emitting array, the light-emitting elements of at least two light-emitting groups are arranged alternately in the row direction and / or column direction.

[0009] Optionally, all light-emitting elements of the laser source are arranged in rows and columns to form a light-emitting array; light-emitting elements of the same light-emitting group are arranged in the row direction of the light-emitting array, and light-emitting elements of at least two light-emitting groups are arranged alternately in the column direction of the light-emitting array; or, light-emitting elements of the same light-emitting group are arranged in the column direction of the light-emitting array, and light-emitting elements of at least two light-emitting groups are arranged alternately in the row direction of the light-emitting array.

[0010] Optionally, the light-emitting array can be a rectangular array or a circular array.

[0011] Optionally, the laser source also includes a diffusion element located on the light-emitting side of at least two light-emitting groups.

[0012] Optionally, the light-emitting element includes a light-emitting unit; Alternatively, the light-emitting element may include at least two light-emitting units integrally disposed thereon; Alternatively, some light-emitting elements may include one light-emitting unit, while other light-emitting elements may include at least two light-emitting units integrally formed.

[0013] Optionally, the light-emitting element is used to emit linearly polarized light emitted by the light-emitting group to which it belongs; Alternatively, the light-emitting group may also include a polarizing element corresponding to the light-emitting element, and the light emitted by the light-emitting element is modulated by the polarizing element to form linearly polarized light emitted by the light-emitting group.

[0014] Optionally, the first electrodes of all light-emitting elements of the laser light source are connected, and the second electrodes of all light-emitting elements in the same light-emitting group are connected.

[0015] In another aspect of the embodiments of this application, an image acquisition device is provided, including an image receiver and a laser source of any of the above, wherein at least two linearly polarized lights emitted by the laser source are reflected by a target object and then sequentially incident on the image receiver.

[0016] In another aspect of this application, an electronic device is provided, including a display screen and an image acquisition device of any of the above-described types; the image acquisition device is located below the display screen.

[0017] Optionally, the display screen has an optical channel that corresponds to a laser light source in the image acquisition device, and the shape of the light-emitting array in the laser light source is adapted to the cross-sectional shape of the optical channel.

[0018] The beneficial effects of this application include: This application provides a laser light source, an image acquisition device, and an electronic device. When positioning the light-emitting elements in the light-emitting group, at least two light-emitting groups in the laser light source have their light-emitting elements mixed and distributed. This mixed distribution means that light-emitting elements from different light-emitting groups are intermingled, ultimately forming a distribution characteristic where at least two light-emitting elements belonging to the same light-emitting group are interspersed with light-emitting elements from other light-emitting groups. This allows for a higher degree of overlap in the illuminated areas formed by the mixed-distribution light-emitting groups. When setting the optical film layer, the mixed-distribution light-emitting groups can correspond to positions in the optical film layer where there are differences in transmittance, thereby weakening the impact of transmittance differences at different positions in the optical film layer on light intensity and improving the difference in the illumination effect of linearly polarized light emitted by different light-emitting groups on the target area. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the laser array arrangement. Figure 2 This is one of the structural schematic diagrams of a laser source provided in the embodiments of this application; Figure 3 for Figure 2 A cross-sectional view of the laser source shown; Figure 4 This is a second schematic diagram of the structure of a laser source provided in an embodiment of this application; Figure 5 This is the third schematic diagram of a laser source structure provided in the embodiments of this application; Figure 6 This is the fourth schematic diagram of a laser source provided in the embodiments of this application; Figure 7 This is one of the structural schematic diagrams of a light-emitting element provided in the embodiments of this application; Figure 8 This is a second schematic diagram of the structure of a light-emitting element provided in an embodiment of this application; Figure 9 This is the third schematic diagram of the structure of a light-emitting element provided in the embodiments of this application; Figure 10 This is a schematic diagram of the structure of an image acquisition device provided in an embodiment of this application; Figure 11This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0020] Icons: 10-Laser source; 110-Light-emitting element; 111-Light-emitting unit; 113-First light-emitting element; 114-Second light-emitting element; 121-Substrate; 122-Packaging structure; 130-Diffuser element; 20-Face; 30-Image receiver; 31-Photosensitive unit array; 32-Polarization device; 41-Middle frame; 42-Display screen. Detailed Implementation The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] For ease of understanding, please refer to Figure 1 As shown, the laser 3 in laser array 1 is divided into two laser groups 2. The linearly polarized light emitted by the two laser groups 2 has different polarization directions. This facilitates its application in polarization-based 3D imaging technology, providing polarization differentiation and allowing for the reconstruction of facial contours. (Continue referring to...) Figure 1 One laser group 2 is concentrated in the upper half of the region, and another laser group 2 is concentrated in the lower half. When arranged in this "group-based concentrated distribution" manner, the linearly polarized light emitted by the different laser groups 2 will have slightly different illumination effects on the face area. For example, in terms of the illuminated area: the illuminated area of ​​the linearly polarized light emitted by the different groups may differ slightly; in terms of light intensity: when the same optical film is placed on the light-emitting side of both laser groups, the transmittance of the optical film itself may vary at different locations due to manufacturing process limitations. This difference will cause different losses of the linearly polarized light emitted by the different groups after passing through the optical film, resulting in a difference in light intensity when they illuminate the face area. This different illumination effect introduces additional differences besides polarization direction, increasing the difficulty of recognizing polarization differences, hindering the reconstruction of the facial contour surface, and affecting the face recognition effect.

[0022] To mitigate this adverse effect, one aspect of the present application provides a laser light source comprising at least two light-emitting groups; the linearly polarized light emitted by any two light-emitting groups has different polarization directions; the light-emitting group includes light-emitting elements, and the light-emitting elements of at least two light-emitting groups are mixed and distributed with each other.

[0023] Different light-emitting groups in a laser source can emit linearly polarized light with different polarization directions. This allows the laser source to provide differentiated linearly polarized light that can be used to reconstruct the contours of the target object when applied to polarization-based 3D imaging technology. When positioning the light-emitting elements in the light-emitting groups, at least two light-emitting groups in the laser source have their light-emitting elements mixed together. This mixed distribution means that light-emitting elements from different groups are intermingled, resulting in a distribution characteristic where at least two light-emitting elements from the same group are interspersed with light-emitting elements from other groups. This allows for a higher degree of overlap in the illuminated areas formed by the mixed distribution of light-emitting groups. When setting the optical film layer, the mixed distribution of light-emitting groups corresponds to positions in the optical film layer with differences in transmittance, thereby weakening the impact of transmittance differences at different locations in the optical film layer on light intensity and improving the difference in illumination effect of the linearly polarized light emitted by different light-emitting groups on the target object area.

[0024] Figure 2 This is a schematic diagram of the structure of a laser source provided in an embodiment of this application. Figure 2 The diagram shows the light-emitting group included in the laser light source, and the light-emitting element 110 included in the light-emitting group.

[0025] The more light-emitting groups involved in the mixed distribution, the better the improvement. For example, all light-emitting groups are mixed and distributed among themselves. Figure 2 and Figure 3 The diagram shows two light-emitting groups, namely a first light-emitting group and a second light-emitting group, wherein the first light-emitting group includes a plurality of light-emitting elements 110 ( Figure 2 The solid-line frame contains 18 elements, referred to as the first light-emitting element 113 for easy distinction from the light-emitting elements in the second light-emitting group. The second light-emitting group includes multiple light-emitting elements 110. Figure 2 The dashed box contains 18 elements, which are referred to as the second light-emitting elements 114 for easy distinction from the light-emitting elements in the first light-emitting group. The light-emitting elements 110 of the two light-emitting groups are mixed and distributed to form an interlaced distribution effect. This makes the overlap of the illuminated areas formed by the first light-emitting group and the second light-emitting group higher. When setting the optical film layer (such as the diffuser element), both can correspond to the positions of the optical film layer with deviations, thereby weakening the influence of the transmittance difference of different positions of the optical film layer on the light intensity.

[0026] When the laser light source 10 is applied to three-dimensional polarization imaging technology, different light-emitting groups can be controlled to be lit sequentially in a certain order, with the lighting cycles of different light-emitting groups staggered to ensure that at most one light-emitting group is lit at the same time. This ensures that the image receiver 30 can only receive light emitted by one light-emitting group at a time, and cannot receive light from the other light-emitting groups. Based on this control method, after one light-emitting group is lit (while the other light-emitting groups are off), it emits linearly polarized light in one polarization direction, which is then reflected by the target object and received by the image receiver 30, resulting in an image. Then, the lit light-emitting group is turned off, and the next light-emitting group is lit, emitting linearly polarized light in another polarization direction, until the next image is obtained. By controlling the lighting and shooting sequentially in this way, an image can be obtained when each light-emitting group is lit. Based on the above description, the final illumination effect of the mixed-distribution light-emitting groups is similar, so the brightness and other qualities of each image are similar.

[0027] When the light-emitting groups of the laser source 10 are mixed and distributed, all the light-emitting elements 110 in the distributed laser source 10 can be arranged in an array. Utilizing the regularity of the array arrangement, the light output effect can be improved and the circuit design complexity reduced. For ease of understanding, the array arrangement forms will be described below: Example 1 All light-emitting elements 110 of the laser source 10 are arranged in an array to form a light-emitting array, wherein the light-emitting elements 110 are arranged in rows and columns. In the row direction and / or column direction of the light-emitting array, at least one light-emitting element 110 from another light-emitting group is disposed between two adjacent light-emitting elements 110 in the same light-emitting group. For example, please refer to... Figure 2 The 36 light-emitting elements 110 shown are divided into a first light-emitting group and a second light-emitting group, and the 36 light-emitting elements 110 are distributed in 6 rows and 6 columns. In the first light-emitting group, there is a second light-emitting element 114 in the second light-emitting group between two adjacent first light-emitting elements 113.

[0028] More specifically, optionally, in the light-emitting array, light-emitting elements 110 of at least two light-emitting groups are arranged alternately in the row and / or column directions. For example, please refer to... Figure 2 The first light-emitting element 113 of the first light-emitting group and the second light-emitting element 114 of the second light-emitting group are arranged alternately in the row direction (i.e., in an ABAB arrangement). Simultaneously, the first light-emitting element 113 of the first light-emitting group and the second light-emitting element 114 of the second light-emitting group are also arranged alternately in the column direction. This allows for a more uniform mixing of the first and second light-emitting groups, facilitating the absorption of transmittance differences at different locations within the optical film layer. Consequently, the illuminated area and light intensity formed by the first and second light-emitting groups in the target area are ultimately similar.

[0029] Example 2 All light-emitting elements 110 of the laser source 10 are arranged in an array to form a light-emitting array, wherein the light-emitting elements 110 are arranged in rows and columns. Light-emitting elements 110 of the same group are arranged in the row direction of the light-emitting array, and in the column direction of the light-emitting array, light-emitting elements 110 of at least two groups are arranged alternately. For example, please refer to... Figure 4 The 36 light-emitting elements 110 shown are divided into a first light-emitting group and a second light-emitting group, and the 36 light-emitting elements 110 are distributed in 6 rows and 6 columns. The first light-emitting elements 113 of the first light-emitting group are distributed in rows 1, 3, and 5, and the second light-emitting elements 114 of the second light-emitting group are distributed in rows 2, 4, and 6. This can absorb the difference in transmittance of different positions of the optical film layer from the column direction, so that the illuminated area and light intensity formed by the first light-emitting group and the second light-emitting group in the area where the target object is located are similar.

[0030] Example 3 All light-emitting elements 110 of the laser source 10 are arranged in an array to form a light-emitting array, wherein the light-emitting elements 110 are arranged in rows and columns. Light-emitting elements 110 of the same group are arranged in the column direction of the light-emitting array, and in the row direction of the light-emitting array, light-emitting elements 110 of at least two groups are arranged alternately. For example, please refer to... Figure 5 The 36 light-emitting elements 110 shown are divided into a first light-emitting group and a second light-emitting group, and the 36 light-emitting elements 110 are distributed in 6 rows and 6 columns. The first light-emitting element 113 of the first light-emitting group is distributed in columns 1, 3, and 5, and the second light-emitting element 114 of the second light-emitting group is distributed in columns 2, 4, and 6. This can absorb the difference in transmittance of different positions of the optical film layer from the row direction, so that the illuminated area and light intensity formed by the first light-emitting group and the second light-emitting group in the area where the target object is located are similar.

[0031] In some alternative implementations, the light-emitting array is a rectangular array or a circular array. For example... Figure 2 , Figure 4 and Figure 5 As shown, the light-emitting arrays are all rectangular arrays, for example... Figure 6 As shown, the light-emitting array is a circular array.

[0032] In some alternative implementations, the linearly polarized light emitted by at least two light-emitting groups is in the infrared band, which can reduce the sensitivity of the human eye.

[0033] In some alternative embodiments, the laser source includes two light-emitting groups, so that the two light-emitting groups can emit linearly polarized light with two polarization directions, and the polarization directions of the two linearly polarized lights are perpendicular to each other, such as linearly polarized light with a polarization direction of 0 degrees and linearly polarized light with a polarization direction of 90 degrees, or linearly polarized light with a polarization direction of 45 degrees and linearly polarized light with a polarization direction of 135 degrees.

[0034] The number of light-emitting elements 110 included in a light-emitting group can be arbitrary. Different light-emitting groups may have different or the same number of light-emitting elements 110. Of course, when different light-emitting groups have similar or the same number of light-emitting elements 110, the lighting effect can be similar.

[0035] After understanding the relationship between the light-emitting group and the light-emitting element 110, the specific structure of the light-emitting element 110 will be explained below: The light-emitting element 110 includes at least one light-emitting unit 111, wherein the light-emitting unit 111 is the smallest unit in the light-emitting element 110 with independent light-emitting capability. For example, when the light-emitting element 110 is a VCSEL (Vertical Cavity Surface Emitting Laser) laser chip, the light-emitting unit 111 is the smallest light-emitting unit in the VCSEL laser chip. The optical resonant cavity is at least part of the light-emitting unit 111. Under electrical excitation, the optical resonant cavity is used to repeatedly reflect photons to excite more atomic transitions and release more photons of the same frequency and phase. In other words, the light inside the light-emitting element 110 is generated in the optical resonant cavity and finally emitted from the light-emitting window (also called the optical aperture, which refers to a specific area in the laser structure designed to allow photons to escape, which can be a circular or square opening) on ​​one side of the optical resonant cavity. Therefore, a light-emitting unit 111 has a single or independent light-emitting window.

[0036] Of course, a light-emitting element 110 may include any number of light-emitting units 111, such as Figure 7 As shown, the light-emitting element 110 includes a light-emitting unit 111 and has a light-emitting window. After the light-emitting element 110 is lit, a beam of light is emitted outward from the light-emitting window. Figure 8 As shown, the light-emitting element 110 includes two light-emitting units 111 with two spaced light-emitting windows. After the light-emitting element 110 is lit, a beam of light is emitted outward from each light-emitting window. Figure 9 As shown, the light-emitting element 110 includes four light-emitting units 111 and has four spaced light-emitting windows. After the light-emitting element 110 is lit, a beam of light is emitted outward from each light-emitting window.

[0037] It should be understood that all light-emitting units 111 in the light-emitting element 110 share the same substrate (also called the substrate) so that they can be integrally formed. For example, in mass production, a large number of light-emitting units 111 can be formed in the same wafer; when the light-emitting element 110 has only a single light-emitting unit 111 (such as... Figure 7 The light-emitting element 110 is formed into separate light-emitting units 111 through a cutting process; when the light-emitting element 110 has two or more light-emitting units 111 (e.g. Figure 8 or Figure 9 ), can be directly cut into units of all light-emitting units 111 of the same light-emitting element 110 (e.g., by Figure 8 Cut into units of two light-emitting units 111 or in order to Figure 9 The light-emitting elements 110 are cut into units of four light-emitting units 111. In this way, the different light-emitting elements 110 after cutting can be separated from each other, but all the light-emitting units 111 in the same light-emitting element 110 are not separated from each other and still share the same substrate. In this way, the gap between all the light-emitting units 111 in the light-emitting element 110 is very small or almost non-existent, which can further miniaturize the overall volume of the light-emitting element 110. Especially when it is applied to the under-display hole-punch scenario, it can further reduce the hole diameter and increase the screen ratio.

[0038] Since the light-emitting element 110 can include an unlimited number of light-emitting units 111, it has the following multiple grouping methods: The first type: In the same light-emitting group, all light-emitting elements 110 have one light-emitting unit 111; The second type: In the same light-emitting group, all light-emitting elements 110 have two or more light-emitting units 111, and they are integrated into one piece, that is, they share the same substrate as mentioned above. The third type: the light-emitting element 110 in the same light-emitting group is divided into two parts. One part of the light-emitting element 110 has one light-emitting unit 111, and the other part of the light-emitting element 110 has two or more light-emitting units 111, and they are integrated into one unit, that is, they share the same substrate as mentioned above.

[0039] To enable the light-emitting group to emit linearly polarized light with the desired polarization direction, the light-emitting element 110 within the light-emitting group can directly emit linearly polarized light, or the light-emitting element 110 can first emit natural light and then form linearly polarized light through a polarization element. Specifically: One illustration is that the light-emitting element 110 can be equipped with a structure that generates and selects the polarization state, such as a Brewster window or an intracavity polarizer, or the anisotropy of the gain medium inside the light-emitting element 110 can be used to make the light emitted from the light-emitting element 110 itself have linearly polarized light with the desired polarization direction.

[0040] Another illustration: The light-emitting element 110 itself does not directly emit linearly polarized light, but first emits natural light or unpolarized light, and then by adding a polarizing element outside the light-emitting element 110 in its light-emitting path, the natural light or unpolarized light is adjusted in polarization state by the polarizing element to form linearly polarized light that conforms to the expected polarization direction.

[0041] To facilitate the excitation of light emitted from the light-emitting units 111 in the light-emitting element 110, electrodes are provided on the light-emitting units 111 to apply excitation. Each light-emitting unit 111's electrodes can be divided into a first electrode and a second electrode. When the electrodes of the light-emitting units 111 are externally connected, the first electrodes of all light-emitting elements 110 in the laser source 10 can be connected together, and the second electrodes of all light-emitting elements 110 in the same light-emitting group can be connected together. The second electrodes of light-emitting elements 110 in different light-emitting groups are not connected. This allows the second electrodes to control the different light-emitting groups to light up in a predetermined order, such as satisfying the aforementioned requirement that the lighting cycles of different light-emitting groups are staggered so that at most one light-emitting group is lit up at any given time.

[0042] To ensure a more uniform distribution of light emitted from the laser source 10 to the target area, in some alternative embodiments, such as... Figure 3 As shown, the laser source 10 also includes a diffusion element 130, which is located on the light-emitting side of all light-emitting groups. This allows the linearly polarized light emitted from each light-emitting group to be diffused and homogenized by the diffusion element 130 before being emitted to the target area. Based on the foregoing description, although the transmittance of the diffusion element 130 may vary at different locations due to manufacturing limitations, the light-emitting elements 110 from different light-emitting groups can be mixed together. This allows the laser source 10 to absorb the transmittance differences at different locations of the diffusion element 130 through a reasonable arrangement, ultimately creating an illumination effect with minimal differences in illuminated area and intensity.

[0043] The laser light source 10 can be used as a packaged light source or an unpackaged light source, depending on whether it is packaged or not. Taking a packaged light source as an example: Figure 3 As shown, the packaged light source includes a substrate 121 and a packaged structure 122 that forms a packaged space with the substrate 121. All light-emitting groups are located in the packaged space. The substrate 121 or the packaged structure 122 has a light-transmitting area corresponding to all light-emitting groups, so that the linearly polarized light emitted by the light-emitting groups can smoothly propagate outward through the light-transmitting area.

[0044] In some alternative embodiments, the diffusion element 130 may be part of the encapsulation structure 122, in which case the light-transmitting area of ​​the encapsulation structure 122 is located in the diffusion element 130.

[0045] In some alternative implementations, the packaging structure 122 may be a ceramic package.

[0046] In some alternative implementations, when the light-emitting element 110 is a VCSEL laser chip, it includes, but is not limited to, top-emitting and bottom-emitting types.

[0047] In another aspect of the embodiments of this application, an image acquisition device is provided, including an image receiver 30 and a laser light source 10 of any of the above.

[0048] To facilitate understanding, let's first provide an overview of the principle behind polarization-based 3D imaging using image acquisition devices: Linearly polarized light has the following characteristics: When linearly polarized light propagates to the surface of a target object and is reflected by the target object, the polarization state of each ray in the linearly polarized light changes. The amount of change in the polarization state of each ray is related to the material of the target object's surface where the ray is incident and the angle of incidence (spatial position) of each point on the target object's contour surface. Please refer to... Figure 10 The light-emitting group emits linearly polarized light towards the face 20 (target object). Utilizing the aforementioned characteristics of linearly polarized light, and based on the differences in the spatial positions of various points in the face contour (the incident angle of linearly polarized light differs at different points) and the surface material of the face 20, the linearly polarized light reflected by the face 20 carries polarization information corresponding to the face contour. Subsequently, it is received sequentially by the image receiver 30 according to the incident order. In this way, the image receiver 30 generates multiple polarized images sequentially based on their incident order. Since the polarization directions of each linearly polarized light are different, the depth information of the face 20 can be obtained by analyzing the differences between multiple polarized images. Based on this, the face contour can be reconstructed more accurately, which helps to achieve high-precision face recognition.

[0049] It should be understood that images can be used for face recognition, including face matching and / or anti-spoofing identification. Face matching refers to verifying whether the face to be verified is the same person as a pre-recorded correct face in the database (generally determined by calculating similarity). The correct face is also called a face template or database image. Anti-spoofing identification refers to verifying whether the face to be verified is a real face or a forgery such as a photo, video, or silicone face mold. Of course, when the target object is changed to a hand, gesture imaging, vein and palm print imaging, etc., can also be performed.

[0050] The image receiver 30 includes a photosensitive unit array 31 and a polarizing device 32. The photosensitive unit array 31 is located on the light-emitting side of the polarizing device 32. This means that linearly polarized light, after being reflected by the target object, passes through the polarizing device 32 before entering the photosensitive unit array 31. Furthermore, the polarization direction of the polarizing device 32 has the following relationship with the laser source 10: the polarization direction of the polarizing device 32 forms an angle smaller than a preset range with one of the polarization directions of the linearly polarized light emitted by the laser source 10, for example, an angle of 0 degrees, meaning the two polarization directions are the same. This allows the image receiver 30 to receive more information from some linearly polarized light and less information from other linearly polarized light, thereby creating the expected differentiation of information from different linearly polarized light.

[0051] In another aspect of the embodiments of this application, an electronic device is provided, such as... Figure 11As shown, the device includes a main body and any of the above-mentioned image acquisition devices, with the image acquisition device disposed on the main body.

[0052] The aforementioned electronic devices may specifically include mobile phones, tablets, televisions, laptops, smart home devices (such as smart air conditioners, smart refrigerators, smart speakers, smart lights or smart curtains, etc.), wearable electronic devices, in-vehicle devices (also known as vehicle infotainment systems), virtual reality devices, etc., and this application does not impose any restrictions on them.

[0053] For example Figure 11 As shown, a mobile phone is shown, which includes a main body and the aforementioned image acquisition device. The main body includes a back panel, a mid-frame 41, a motherboard, a battery, and a display screen 42. The back panel and the display screen 42 are respectively installed on opposite sides of the mid-frame 41 so that the three enclose an internal space. The motherboard and the battery can be located in the internal space. The battery is used to power the motherboard, the image acquisition device, and the display screen 42.

[0054] To facilitate image acquisition by the image acquisition device, a light channel can be created on the display screen 42, for example, by creating a cutout portion on the display screen 42. The light channel corresponds to the laser light source 10 in the image acquisition device, and the shape of the light-emitting array in the laser light source 10 matches the cross-sectional shape of the light channel. For example, when... Figure 11 In the case of a circular excavation section, the following method can be used: Figure 6 The circular arrangement of laser light sources 10 is shown; when the cross-section of the drilled part is square, a method can be used. Figure 2 , Figure 4 , Figure 5 Any type of laser source 10. This allows the laser source 10 to make full use of the perforated portion.

[0055] In the description of this application, the target object can be the face 20 in the accompanying drawings, or a part of the face 20 (such as cheeks, nose, and eyes). Of course, it is not limited to this, and can also be other objects with three-dimensional dimensions, such as fingers, palms, etc.

[0056] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0057] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0058] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0059] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0060] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A laser light source, characterized in that, Includes at least two light-emitting groups; The polarization directions of the linearly polarized light emitted by any two of the light-emitting groups are different; The light-emitting group includes light-emitting elements, and at least two light-emitting groups have light-emitting elements that are mixed and distributed with each other.

2. The laser source as described in claim 1, characterized in that, All the light-emitting elements of the laser light source are arranged in rows and columns to form a light-emitting array; In the row direction and / or column direction of the light-emitting array, at least one light-emitting element from another light-emitting group is disposed between two adjacent light-emitting elements in the same light-emitting group.

3. The laser source as described in claim 2, characterized in that, In the light-emitting array, the light-emitting elements of the at least two light-emitting groups are arranged alternately in the row direction and / or column direction.

4. The laser light source as described in claim 1, characterized in that, All the light-emitting elements of the laser light source are arranged in rows and columns to form a light-emitting array; The light-emitting elements of the same light-emitting group are arranged in the row direction of the light-emitting array, and the light-emitting elements of the at least two light-emitting groups are arranged alternately in the column direction of the light-emitting array; or, the light-emitting elements of the same light-emitting group are arranged in the column direction of the light-emitting array, and the light-emitting elements of the at least two light-emitting groups are arranged alternately in the row direction of the light-emitting array.

5. The laser source according to any one of claims 2 to 4, characterized in that, The light-emitting array is a rectangular array or a circular array.

6. The laser light source according to any one of claims 1 to 4, characterized in that, The laser source also includes a diffusion element located on the light-emitting side of the at least two light-emitting groups.

7. The laser light source according to any one of claims 1 to 4, characterized in that, The light-emitting element includes a light-emitting unit; Alternatively, the light-emitting element may include at least two light-emitting units integrally disposed thereon; Alternatively, some of the light-emitting elements may include one light-emitting unit, while other parts of the light-emitting elements may include at least two light-emitting units integrally disposed thereon.

8. The laser light source according to any one of claims 1 to 4, characterized in that, The light-emitting element is used to emit linearly polarized light emitted by the light-emitting group to which it belongs; Alternatively, the light-emitting group may further include a polarizing element corresponding to the light-emitting element, wherein the light emitted by the light-emitting element is modulated by the polarizing element to form linearly polarized light emitted by the light-emitting group.

9. The laser source according to any one of claims 1 to 4, characterized in that, The first electrodes of all light-emitting elements of the laser light source are connected, and the second electrodes of all light-emitting elements of the same light-emitting group are connected.

10. An image acquisition device, characterized in that, It includes an image receiver and a laser source as described in any one of claims 1 to 9, wherein at least two linearly polarized lights emitted by the laser source are reflected by the target object and then sequentially incident on the image receiver.

11. An electronic device, characterized in that, It includes a display screen and an image acquisition device as described in claim 10; the image acquisition device is located below the display screen.

12. The electronic device as claimed in claim 11, characterized in that, The display screen has a light channel, which corresponds to a laser light source in the image acquisition device. The shape of the light-emitting array in the laser light source is adapted to the cross-sectional shape of the light channel.

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