Light source, image receiver and detection device thereof, image acquisition device and electronic equipment

Abstract

The utility model provides a light source, an image receiver, a detection device of the image receiver, an image acquisition device and electronic equipment, and relates to the technical field of biological recognition, the light source comprises a plurality of packaging light sources, each packaging light source comprises a packaging structure and a light-emitting element which is arranged in the packaging structure and is used for emitting initial light, and each packaging structure comprises a light blocking part and a polarization part. The light blocking part is used for preventing the initial light from being emitted through the light blocking part, at least part of the initial light is emitted through the polarization part to form linearly polarized light, and the polarization directions of the linearly polarized light emitted by the at least two packaging light sources are different; in this way, in the process that the linearly polarized light emitted by the multiple packaging light sources is reflected by the target object and then sequentially enters the image receiver, the packaging light sources can emit the linearly polarized light as much as possible, stray light of unexpected polarization is prevented from being formed, the signal-to-noise ratio finally received by the image receiver is increased, and the recognition precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biometric identification, in particular to a light source, an image receiver and a detection device thereof, an image acquisition device and an electronic device. BACKGROUND

[0002] With the development of portable terminal devices, the application of biometric identification technology is becoming more and more extensive and in-depth. For example, electronic devices, fingerprint recognition, face recognition, etc. have been increasingly applied in screen wake-up of devices and identity authentication steps of various programs, improving the security of the device and the flexibility of the use mode.

[0003] At present, the main schemes for realizing face recognition include binocular vision scheme, time flight scheme, and structured light scheme. The binocular vision scheme has a limited range of use because the reconstruction accuracy is proportional to the camera baseline length. The cost of the time flight camera is relatively high, and its accuracy of three-dimensional imaging is not high due to the limitation of time resolution. The structured light scheme has the advantage of high imaging accuracy, but its response speed and frame rate are low, and the imaging accuracy decreases with the increase of the imaging distance. Therefore, another polarization three-dimensional imaging technology for face recognition has also been gradually developed. However, the polarization three-dimensional imaging technology is usually complex in implementation, and the recognition accuracy is not high. CONTENT OF THE INVENTION

[0004] The present application aims at the deficiencies in the prior art, and provides a light source, an image receiver and a detection device thereof, an image acquisition device and an electronic device.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In one aspect of the embodiments of the present application, a light source is provided, which includes a plurality of packaged light sources. The packaged light source includes a packaging structure and a light-emitting element built in the packaging structure and used for emitting initial light. The packaging structure includes a light-blocking part and a polarization part. The light-blocking part is used for preventing the initial light from being emitted through the light-blocking part. At least part of the initial light is emitted through the polarization part to form linearly polarized light. The polarization directions of the linearly polarized light emitted by at least two packaged light sources are different. The linearly polarized light emitted by the plurality of packaged light sources is sequentially incident on an image receiver after being reflected by a target object.

[0007] Optionally, the peripheral contour of the polarization part includes a plurality of straight lines, and at least one straight line is parallel to the polarization direction of the polarization part.

[0008] Optionally, the peripheral contour of the polarization part is a polygon.

[0009] Optionally, the peripheral contour of the polarization part is a square or a rectangle.

[0010] Optionally, the light blocking part comprises a frame surrounding the outer periphery of the light emitting element; the packaging structure further comprises a packaging substrate on which the light emitting element is fixed, and the packaging substrate and the polarization part are respectively arranged on opposite side openings of the frame.

[0011] Optionally, one side surface of the polarization part has a first micro-nano grating, and the first micro-nano grating is arranged towards the light emitting element.

[0012] Optionally, the number of the plurality of packaged light sources is two, and the polarization directions of the linearly polarized light emitted by the two packaged light sources are perpendicular to each other.

[0013] Optionally, the polarization directions of the linearly polarized light emitted by the two packaged light sources are vertical direction and horizontal direction respectively.

[0014] Optionally, the light emitting element is an infrared light emitting element, and the light emitting wavelength band of the infrared light emitting element is 940 nm.

[0015] In another aspect of the embodiments of the present application, an image receiver is provided, comprising a polaroid and an image sensor located on the light emitting side of the polaroid, the polarization direction of the polaroid is the same as the polarization direction of the linearly polarized light emitted by any one of a plurality of packaged light sources included in a light source, and the polarization directions of the linearly polarized light emitted by at least two packaged light sources are different; the linearly polarized light emitted by the plurality of packaged light sources sequentially enters the image receiver after being reflected by a target object.

[0016] Optionally, the image receiver further comprises:

[0017] a lens group, the lens group being located on the light receiving side of the image sensor;

[0018] a light filtering unit, the light filtering unit being located between the lens group and the image sensor.

[0019] Optionally, the polaroid is located on the side of the lens group away from the image sensor, and the light filtering unit and the polaroid are separate components.

[0020] Optionally, the polaroid is located between the lens group and the image sensor.

[0021] Optionally, the polaroid is located between the light filtering unit and the image sensor.

[0022] Optionally, the polaroid is located between the lens group and the light filtering unit.

[0023] Optionally, the light filtering unit and the polaroid are separate components.

[0024] Alternatively, the light filtering unit is a light filter, and the light filter and the polaroid share the same carrier plate and are respectively formed on opposite sides of the carrier plate.

[0025] Optionally, the polaroid has a second micro-nano grating.

[0026] The periphery of the polarizer is connected to the image sensor through a bridge structure to form a gap between the polarizer and the image sensor for accommodating the second micro-nano grating, or the polarizer further has a protective layer covering the second micro-nano grating, and the protective layer is bonded to the image sensor through a bonding layer.

[0027] In another aspect of the embodiments of the present application, an image acquisition device is provided, which comprises a light emitting device and a receiving device arranged along a light path, wherein the light emitting device is any of the above light sources.

[0028] In another aspect of the embodiments of the present application, an image acquisition device is provided, which comprises a light emitting device and a receiving device arranged along a light path, wherein the light emitting device is any of the above light sources.

[0029] In another aspect of the embodiments of the present application, an image acquisition device is provided, which comprises a light emitting device and a receiving device arranged along a light path, wherein the light emitting device is any of the above light sources.

[0030] In another aspect of the embodiments of the present application, a light source detection device is provided, which comprises a photoelectric sensor and a polarizer, the polarizer is located on the light receiving side of the photoelectric sensor, and the light receiving side of the polarizer is used to arrange any of the above packaging light sources.

[0031] The polarizer and the packaging light source have switchable first and second relative positions.

[0032] In the first relative position, the polarization direction of the polarizer is the same as the polarization direction of the linearly polarized light emitted by the packaging light source.

[0033] In the second relative position, the polarization direction of the polarizer is perpendicular to the polarization direction of the linearly polarized light emitted by the packaging light source.

[0034] In another aspect of the embodiments of the present application, an image receiver detection device is provided, which comprises a detection light source emitting preset linearly polarized light, and the light emitting side of the detection light source is used to arrange any of the above image receivers.

[0035] The detection light source and the image receiver have switchable first and second relative positions.

[0036] In the first relative position, the polarization direction of the preset linearly polarized light is the same as the polarization direction of the polarizer of the image receiver.

[0037] In the second relative position, the polarization direction of the preset linearly polarized light is perpendicular to the polarization direction of the polarizer of the image receiver.

[0038] In another aspect of the embodiments of the present application, an electronic device is provided, which comprises a device main body and the above image acquisition device, and the image acquisition device is arranged on the device main body.

[0039] In still another aspect of the embodiments of the present application, an electronic device is provided, comprising a device body and an image acquisition device, the image acquisition device comprising a light emitting device and a receiving device arranged along a light path, wherein the light emitting device is any of the light sources described above;

[0040] The device body comprises a display screen, the display screen comprising a display module and a light-transmitting cover plate attached to a display side of the display module, the display module having a light channel extending from the display side to a non-display side, the light emitting element and / or the receiving device of the image acquisition device corresponding to an opening of the light channel on the non-display side, the polarization part of the image acquisition device being arranged on the light-transmitting cover plate and located at the opening of the light channel on the display side.

[0041] In still another aspect of the embodiments of the present application, an electronic device is provided, comprising a device body and an image acquisition device, the image acquisition device comprising a light emitting device and a receiving device arranged along a light path, wherein the receiving device is any of the partial image receivers described above (excluding the image receiver with the polarizer located between the lens group and the image sensor);

[0042] The device body comprises a display screen, the display screen comprising a display module and a light-transmitting cover plate attached to a display side of the display module, the display module having a light channel extending from the display side to a non-display side, the light emitting element and / or the receiving device of the image acquisition device corresponding to an opening of the light channel on the non-display side, the polarization part of the image acquisition device being arranged on the light-transmitting cover plate and located at the opening of the light channel on the display side.

[0043] In still another aspect of the embodiments of the present application, an electronic device is provided, comprising a device body and an image acquisition device, the image acquisition device comprising a light emitting device and a receiving device arranged along a light path, wherein the light emitting device is any of the light sources described above, and the receiving device is any of the partial image receivers described above (excluding the image receiver with the polarizer located between the lens group and the image sensor);

[0044] The device body comprises a display screen, the display screen comprising a display module and a light-transmitting cover plate attached to a display side of the display module, the display module having a light channel extending from the display side to a non-display side, the light emitting element and / or the receiving device of the image acquisition device corresponding to an opening of the light channel on the non-display side, the polarization part and / or the polarizer of the image acquisition device being arranged on the light-transmitting cover plate and located at the opening of the light channel on the display side.

[0045] The beneficial effects of the present application include:

[0046] The application provides a light source, an image receiver and a detection device thereof, an image acquisition device and an electronic device. The light source comprises a plurality of packaged light sources. The packaged light source comprises a packaging structure and a light emitting element arranged in the packaging structure and used for emitting initial light. The packaging structure comprises a light blocking part and a polarization part. The light blocking part is used for preventing the initial light from being emitted through the light blocking part. At least part of the initial light is emitted through the polarization part to form linearly polarized light. The polarization directions of the linearly polarized light emitted by at least two packaged light sources are different. In this way, when the linearly polarized light emitted by the plurality of packaged light sources is sequentially incident on the image receiver after being reflected by a target object, the linearly polarized light emitted by the packaged light source can be prevented from forming stray light with an unintended polarization direction, the signal-to-noise ratio of the final image receiver is improved, and the recognition accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0048] Figure 1 One of the structural schematic diagrams of an image acquisition device provided by the embodiments of the application;

[0049] Figure 2 A side sectional view of a packaged light source provided by the embodiments of the application;

[0050] Figure 3 A top view of a packaged light source provided by the embodiments of the application;

[0051] Figure 4 One of the side sectional views of an image receiver provided by the embodiments of the application;

[0052] Figure 5 The second side sectional view of an image receiver provided by the embodiments of the application;

[0053] Figure 6 The third side sectional view of an image receiver provided by the embodiments of the application;

[0054] Figure 7 The structural schematic diagram of an integrated piece of a polaroid and a filter provided by the embodiments of the application;

[0055] Figure 8 A top view of an electronic device provided by the embodiments of the application;

[0056] Figure 9 A side sectional view of an electronic device provided by the embodiments of the application.

[0057] Icon: 100 - face; 200 - encapsulated light source; 210 - polarization part; 211 - first micro-nano grating; 220 - light blocking part; 230 - encapsulation substrate; 240 - light emitting element; 300 - image receiver; 310 - image sensor; 320 - polaroid; 321 - second micro-nano grating; 330 - lens group; 340 - light filtering unit; 350 - shell; 360 - bridge structure; 370 - protective layer; 380 - carrier plate; 410 - middle frame; 420 - display screen; 421 - display module; 422 - light-transmitting cover plate; 423 - light channel. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be explained that, in the case of no conflict, each feature in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the protection scope of the present application.

[0059] In the description of the present application, it should be explained that, the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second”, “third”, and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms “set”, “install”, “connect”, “connect” should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the description of the present application, the target object can be the face 100 in the drawings, or a part (such as a cheek, a nose, or an eye) in the face. Of course, it is not limited to this, and can also be other objects with three-dimensional dimensions, such as a finger or a palm.

[0062] In one aspect of the embodiments of the present application, a light source is provided, such asFigure 1 As shown, the image acquisition device includes a plurality of packaged light sources 200. The plurality of packaged light sources 200 can be applied to polarized three-dimensional imaging. For the convenience of understanding, the polarized three-dimensional imaging method of the image receiver is first introduced as follows: please continue to refer to Figure 1 When image acquisition is performed, the linearly polarized light emitted by each of the plurality of packaged light sources 200 is sequentially transmitted to the surface of the target object in time sequence, and after being reflected by the target object, each linearly polarized light carries the polarization information corresponding to the profile surface of the target object, and then sequentially enters the image receiver 300 in time sequence. In this way, the image receiver 300 can sequentially generate a plurality of polarization images according to the incident sequence, and based on the plurality of polarization images, the profile surface of the target object can be accurately reconstructed, which is helpful for high-precision target object recognition, and the polarized three-dimensional imaging can be realized by the light source and the image receiver, and thus the structure is relatively simple.

[0063] For further understanding, the linearly polarized light has the following characteristics: when the linearly polarized light is transmitted to the surface of the target object and reflected by the target object, the polarization state of each light ray in the linearly polarized light changes, and the change amount of the polarization state of each light ray is related to the material of the surface of the target object and the incident angle (spatial position) of each point in the profile surface of the target object. Back to Figure 1 As shown in the image acquisition device, each packaged light source 200 emits linearly polarized light towards the face 100 (target object), utilizes the characteristics of the aforementioned linearly polarized light, and based on the difference in spatial position of each point in the profile surface of the face and the incident angle of the linearly polarized light at different points, the linearly polarized light reflected by the face 100 carries the polarization information corresponding to the profile surface of the face, and then it is sequentially received by the image receiver 300 in time sequence. In this way, the image receiver 300 sequentially generates a plurality of polarization images according to the incident sequence. Since the polarization directions of the linearly polarized light are different, the information of the face 100 in the depth direction can be obtained by analyzing the differences between the plurality of polarization images, and based on this, the profile surface of the face can be accurately reconstructed, which is helpful for high-precision face recognition.

[0064] It should be understood that the polarization image can be used for face recognition including face matching and / or anti-counterfeit identification, wherein the face matching means whether the face to be verified and the correct face (generally judged by calculating the similarity) recorded in the database in advance are the same person, and the correct face is also called face template or database image. The anti-counterfeit identification means whether the face to be verified is a real face or a counterfeit such as a photo, a video, a face silicone mold, etc. Of course, when the target object is changed to a hand, gesture imaging, vein palm print imaging, etc. can also be performed.

[0065] Please refer to Figure 2 Any one of the packaged light sources 200 in the light source will be described as follows:

[0066] The packaged light source 200 comprises a packaging structure and a light emitting element 240, wherein the light emitting element 240 can emit initial light, which can be natural light, circularly polarized light, etc., and the light emitting element 240 is built in the packaging structure, which facilitates the packaging structure to provide protection for the light emitting element 240. In different embodiments, the light emitting element 240 can be an LED lamp, a laser, etc.

[0067] According to the foregoing description, the packaged light source 200 needs to finally emit linearly polarized light outward, and therefore the packaging structure comprises a light blocking part 220 and a polarization part 210.

[0068] The polarization part 210 is located in the transmission path of the initial light, such as Figure 2 As shown in FIG. 2, the polarization part 210 is located on the light emitting side of the light emitting element 240. Therefore, at least part of the initial light will be incident on the polarization part 210, and then the polarization state of the incident initial light is modulated by the polarization part 210 to form the expected linearly polarized light. It should be understood that the polarization direction of the linearly polarized light depends on the polarization part 210, and therefore the corresponding polarization part 210 can be set according to the required polarization direction.

[0069] The light blocking part 220 can block the initial light from being emitted through the light blocking part 220. In other words, part of the initial light emitted by the light emitting element 240 can be incident on the light blocking part 220, and the light blocking part 220 can block this part of light to prevent it from being directly emitted from the light blocking part 220 to form stray light of an unexpected polarization (the stray light will affect the signal-to-noise ratio when finally received by the image receiver 300), so that the light finally emitted from the packaged light source 200 is all linearly polarized light of an expected polarization, which helps to optimize the recognition accuracy. In different embodiments, the light blocking part 220 can block the initial light by absorption or reflection.

[0070] In order to facilitate the image acquisition device to more accurately acquire the image information of the target object and facilitate accurate target object recognition, the polarization directions of the linearly polarized light emitted by at least two packaged light sources 200 can be different, that is, the polarization directions of the linearly polarized light emitted by at least two packaged light sources 200 have a non-zero included angle. Of course, it should be noted that there can also be packaged light sources with the same polarization direction in each packaged light source 200, which aims to increase the intensity of light with the same polarization direction.

[0071] In some possible embodiments, the degree of polarization of the linearly polarized light emitted by the packaged light source 200 should meet a threshold requirement, such as not being equal to zero, so that the linearly polarized light is more convenient to use. The degree of polarization can be represented by P, and P = (I max -I min ) / (I max +I min ), I maxis the luminous intensity of linearly polarized light in the maximum polarization direction. min is the luminous intensity of linearly polarized light in the minimum polarization direction.

[0072] In some possible embodiments, the number of the plurality of packaged light sources 200 is two, such as Figure 1 As shown, there are two packaged light sources 200, and the two packaged light sources 200 should satisfy: the polarization directions of the linearly polarized light emitted by the two packaged light sources 200 are different. In this way, the image acquisition device only includes two packaged light sources 200, which helps to simplify the structure of the image acquisition device and facilitate miniaturization of the image acquisition device. Meanwhile, the polarization images formed by the image receiver 300 are also two, which can also reduce the data processing amount of the image receiver 300.

[0073] In some possible embodiments, the polarization directions of the linearly polarized light emitted by the two packaged light sources 200 are perpendicular to each other.

[0074] For example: the polarization directions of the linearly polarized light emitted by the two packaged light sources 200 are vertical direction and horizontal direction respectively, and the polarization direction of the polarizer 320 is vertical direction or horizontal direction. For example, the vertical direction polarization is defined as 0-degree polarization, and the horizontal direction polarization is 90-degree polarization. In this way, in terms of polarization angle, the linearly polarized light emitted by the two packaged light sources 200 can be maximized, so that the information difference of the two polarization images obtained by the image sensor is the largest, which is beneficial to the identification of the target object.

[0075] In some possible embodiments, as shown in Figure 3 The light blocking part 220 includes a frame, and the light emitting element 240 is located inside the frame. The frame surrounding the outer periphery of the light emitting element 240 can block the entire outer periphery side of the light emitting element 240. In different embodiments, the shape of the frame can be a circular ring, a square ring, etc.

[0076] Please refer to Figure 2 The packaging structure further includes a packaging substrate 230, and the light emitting element 240 is fixed to the packaging substrate 230, and the two can have an electrical connection relationship, for example, the light emitting element 240 is connected to the packaging substrate 230 through reflow soldering. The packaging substrate 230 and the polarization part 210 are respectively arranged at the opposite side openings of the frame, such as Figure 2 In the packaging substrate 230 is located at the bottom opening of the annular frame, and the polarization part 210 is located at the top opening of the annular frame. The packaging substrate 230, the polarization part 210 and the annular frame can form a cavity for the built-in light emitting element 240.

[0077] In some possible embodiments, as shown in Figure 2As shown, the side surface of the polarization part 210 has a first micro-nano grating 211, which is arranged towards the light emitting element 240, so that the first micro-nano grating 211 can be protected by the packaging structure. Of course, in other embodiments, the first micro-nano grating 211 can also be arranged away from the light emitting element 240.

[0078] In some possible embodiments, the peripheral contour of the polarization part 210 includes several straight lines, at least one of which is parallel to the polarization direction of the polarization part 210. Since the human eye cannot directly observe the polarization direction of the polarization part 210, such a straight line parallel to the polarization direction of the polarization part 210 can be used to mark or indicate the polarization direction of the polarization part 210, which facilitates quick identification of the polarization direction of the polarization part 210 in the packaging light source 200 during subsequent assembly of the packaging light source 200, thereby helping to improve the assembly efficiency.

[0079] In some possible embodiments, the peripheral contour of the polarization part 210 is a polygon, such as Figure 3 As shown, the peripheral contour of the polarization part 210 is a square, so that one of the two straight edges in the square is necessarily parallel to the polarization direction of the polarization part 210. Of course, in other embodiments, when the peripheral contour of the polarization part 210 is a rectangle, the long side or the short side of the two straight edges in the rectangle can be specified to be parallel to the polarization direction of the polarization part 210, which is more convenient for quick positioning of the polarization direction. Of course, when there are more than one straight lines and at least two straight lines are not parallel, the packaging light source 200 can be tested by using a subsequent light source detection device, so as to determine the straight line parallel to the polarization direction of the polarization part 210 according to the test result.

[0080] In some possible embodiments, when the packaging light source 200 is an infrared light source, the light emitting element 240 is an infrared light emitting element, and the light emitting wavelength band of the infrared light emitting element is 940 nm, which can reduce the sensitivity of the human eye.

[0081] In some possible embodiments, the packaging light source 200 can be an infrared light source, such as an infrared light emitting element for the light emitting element 240, so that the wavelength band of the initial light is an infrared wavelength band, which can reduce the sensitivity of the human eye. Correspondingly, the aforementioned light blocking part 220 should be able to prevent the initial light of the infrared wavelength band from directly emitting from the position thereof, such as a metal, black non-infrared plastic (which can be formed by injection molding) and the like.

[0082] In some possible embodiments, as shown in Figure 2 As shown, a step can be arranged on the top of the light blocking part 220, and the polarization part 210 is fixed by the step surface.

[0083] In another aspect of the embodiments of the present application, an image receiver is provided.

[0084] Please refer to Figure 1 The image receiver 300 will be described as follows:

[0085] The image receiver 300 includes a polarizer 320 and an image sensor 310, wherein the image sensor 310 is located on the light-out side of the polarizer 320, that is, the linearly polarized light reflected by the target object first passes through the polarizer 320 and then is incident on the image sensor 310. And the polarization direction of the polarizer 320 is the same as the polarization direction of the linearly polarized light emitted by any one of the plurality of packaged light sources included in the light source (here, the light source can be any of the above light sources or a light source other than the above light sources, and when it is not any of the above light sources, it should meet that the polarization directions of the linearly polarized light emitted by at least two packaged light sources are different). Thus, after the linearly polarized light is reflected by the target object, it is first modulated into single linearly polarized light by the polarizer 320, and then received by the image sensor 310 for imaging.

[0086] For example Figure 1 In the above embodiment, it is shown that the light source includes two packaged light sources, and the polarization directions of the two packaged light sources are different, and the polarization direction of the polarizer 320 is perpendicular to the polarization direction of the linearly polarized light emitted by one of the packaged light sources 200, and is the same as the polarization direction of the linearly polarized light emitted by the other packaged light source 200.

[0087] For example, the polarization directions of the linearly polarized light emitted by the two packaged light sources 200 are vertical and horizontal respectively, and the polarization direction of the polarizer 320 is vertical or horizontal. For example, the vertical polarization is defined as 0-degree polarization, and the horizontal polarization is 90-degree polarization. In this way, in terms of polarization angle, the linearly polarized light emitted by the two packaged light sources 200 can be maximized.

[0088] On this basis, in combination with the polarizer 320, the image sensor 310 can maximize the difference between the information (such as polarization information) contained in the two polarization images in the process of receiving linearly polarized light: when the polarization direction of the linearly polarized light emitted by one of the packaged light sources 200 is the same as the polarization direction of the polarizer 320, the polarization image formed by the image sensor 310 contains the most information; and when the polarization direction of the linearly polarized light emitted by the other packaged light source 200 is perpendicular to the polarization direction of the polarizer 320, the polarization image formed by the image sensor 310 contains the least information, and the information difference between the two polarization images obtained by the image sensor 310 is the largest, which is beneficial to the identification of the target object.

[0089] In some possible embodiments, as Figures 4 to 6The image receiver 300 further comprises a lens set 330 and a filter unit 340, wherein the lens set 330 is located on the light-receiving side of the image sensor 310 and can guide the linearly polarized light incident on the image sensor 310 so as to make the polarized image formed by the image sensor 310 clearer, and the lens set 330 comprises a plurality of lenses, which are not limited to concave lenses, convex lenses, special-shaped lenses, etc. The filter unit 340 can be matched with the light-emitting wavelength band of the packaged light source 200 and filter out as much interference light (such as ambient light, sunlight, etc.) as possible outside the light-emitting wavelength band. Moreover, the filter unit 340 is located between the lens set 330 and the image sensor 310, which helps to improve the quality of the polarized image formed by the image sensor 310. Of course, in other embodiments, the filter unit 340 can also be located above the lens set 330 or between a plurality of lenses.

[0090] It should be understood that the filter unit 340 can be a filter or a filter film. Specifically, when it is a filter film, according to its location, the filter film can be integrated inside the image sensor, coated on the surface of the image sensor, or coated on the surface of the lens; and when the filter unit 340 is a filter, the filter generally has a carrier plate (such as a glass carrier plate) and can be set independently of the image sensor.

[0091] In some possible embodiments, as shown in FIG. 3B, the image receiver 300 further comprises a lens barrel, which can accommodate the lens set 330. Figures 4 to 6

[0092] As to the setting positions of the polarizer 320 and the filter unit 340, there can be the following multiple examples:

[0093] Example One

[0094] Please refer to Figure 4 The polarizer 320 is located on the side of the lens set 330 away from the image sensor 310, and the filter unit 340 is located between the lens set 330 and the image sensor 310. Therefore, the linearly polarized light is first modulated by the polarizer 320 and then guided by the lens set 330 to be incident on the filter unit 340 after filtering and finally incident on the image sensor 310. In this example, the polarizer 320 has a second micro-nano grating 321 on the surface thereof close to the lens set 330, so as to protect the second micro-nano grating 321. The polarizer 320 should have a certain gap with the lens set 330, so as to avoid damage to the second micro-nano grating 321 on the surface of the polarizer 320 caused by the lens set 330. More specifically, the polarizer 320 can be located in the lens barrel or attached to the top end of the lens barrel.

[0095] In this example, the filter unit 340 and the polarizer 320 should be separate parts, i.e., the filter unit 340 and the polarizer 320 are two independent elements.

[0096] ​Example Two

[0097] Please refer to Figure 5 Or Figure 6 , the polarizer 320 is located between the light filtering unit 340 and the image sensor 310, which can make the linearly polarized light first filtered by the light filtering unit 340 to improve the signal-to-noise ratio of the light, and then polarized by the polarizer 320, which helps to improve the quality of the polarized image. In other words, the stray light outside the light-emitting waveband can be filtered out by the light filtering unit 340 first, and then polarized by the polarizer 320, which is more pure and beneficial to identification.

[0098] In this example, the light filtering unit 340 and the polarizer 320 can be separate or integrated, specifically:

[0099] Figure 5 Or Figure 6 As shown, the light filtering unit 340 and the polarizer 320 are two independent elements, wherein the light filtering unit 340 is arranged closer to the lens group 330, and the polarizer 320 is arranged closer to the image sensor 310. The polarizer 320 and the image sensor 310 can be connected in a bridging or surface pasting manner, such as Figure 5 As shown, the polarizer 320 and the image sensor 310 are connected in a bridging manner through the bridge structure 360, specifically, the bridge structure 360 can be a support column or a support ring, and the peripheral edge of the polarizer 320 is connected to the image sensor 310 through the bridge structure 360. In this way, the bridge structure 360 can be used to make the polarizer 320 and the image sensor 310 have a certain gap, and the second micro-nano grating 321 on the polarizer 320 can be accommodated in the gap to avoid damage caused by contact with the surface of the image sensor 310; for example Figure 6 As shown, the polarizer 320 and the image sensor 310 can be connected in a surface pasting manner, specifically, the polarizer 320 also has a protective layer 370 covering the second micro-nano grating 321, which can protect the second micro-nano grating 321 by using the protective layer 370 (which can be a silicon dioxide layer), and then the protective layer 370 is bonded to the image sensor 310 through an adhesive layer.

[0100] Of course, as shown in Figure 7 The light filtering unit 340 and the polarizer 320 can also be integrated, that is, the light filtering unit 340 is a light filter, and the light filter and the polarizer 320 share the same carrier plate 380, and the two are no longer separately provided with carriers. The polarizer 320 is directly formed on one side surface of the carrier plate 380, and the light filter is directly formed on the other side surface of the carrier plate 380. At this time, the integrated part and the image sensor 310 can still be connected in a bridging or surface pasting manner, and specific settings can be made by referring to the above manner.

[0101] Example Three

[0102] The filter unit 340 is located between the polarizer 320 and the image sensor 310 (in other words, the polarizer is located between the lens group and the filter unit), so that the linearly polarized light is filtered by the filter unit 340 after passing through the polarizer 320.

[0103] In this example, the filter unit 340 and the polarizer 320 can also be separate components or integrated components. The difference from Example 2 is that the positions of the filter unit 340 and the polarizer 320 are different.

[0104] In some possible implementations, as shown in Figures 4 to 6 , the image receiver 300 further includes a housing 350 having an entrance opening for connecting to the lens barrel, and the image sensor 310 is located inside the housing 350. In order to facilitate the linearly polarized light to smoothly enter the image sensor 310, the end of the entrance opening corresponds to the image sensor 310. The lens group 330 is located in the lens barrel, and the filter unit 340 is located between the lens group 330 and the image sensor 310, which can be located in the lens barrel or in the housing. The housing 350 and the lens barrel not only can protect the optical devices contained in the image receiver 300, but also can support the optical devices so as to be arranged at reasonable positions.

[0105] In some possible implementations, the passband of the filter unit 340 should contain the light-emitting wavelength band of the light source (i.e., the packaged light source 200). For example, when the packaged light source 200 is an infrared light source and the light-emitting wavelength band is 940 nm, the filter unit 340 can be a narrow-band filter unit 340, and the passband of the filter unit 340 is 940 nm±10 nm. Through the cooperation of the two, the interference stray light generated by the sunlight can be effectively filtered out.

[0106] In another aspect of the embodiments of the present application, an image acquisition device is provided, which includes an emitting device and a receiving device arranged along an optical path.

[0107] In another aspect of the embodiments of the present application, an image acquisition device is provided, which includes an emitting device and a receiving device arranged along an optical path.

[0108] In another aspect of the embodiments of the present application, an image acquisition device is provided, which includes an emitting device and a receiving device arranged along an optical path, as shown in Figure 1 , wherein the emitting device is any one of the light sources described above, and the receiving device is any one of the image receivers described above.

[0109] The packaged light source 200 may have a threshold requirement on the first degree of polarization in actual use, such as that the first degree of polarization cannot be zero, or the first degree of polarization needs to be greater than 0.1, and the like, and therefore the first degree of polarization of the packaged light source 200 needs to be detected before the image acquisition device is assembled. Based on this, another aspect of the embodiments of the present application provides a light source detection device that obtains a first degree of polarization detection result by receiving linearly polarized light emitted by the packaged light source 200 and analyzing and processing the linearly polarized light.

[0110] Specifically, the light source detection device includes a photoelectric sensor and an analyzer, and the analyzer is located on the light receiving side of the photoelectric sensor. The light receiving side of the analyzer is used to set the packaged light source 200 of any one of the above.

[0111] The analyzer and the packaged light source 200 have a switchable first relative position and a second relative position. The main difference between the first relative position and the second relative position is that the two positions are relatively rotated. The switching mode can be manual or automatic, such as manually or by rotating the analyzer or the packaged light source 200 through a mechanical part (a rotating stage, a mechanical hand, or the like) to cause the two to relatively rotate.

[0112] In the first relative position, the polarization direction of the analyzer is the same as the polarization direction of the linearly polarized light emitted by the packaged light source 200. In the second relative position, the polarization direction of the analyzer is perpendicular to the polarization direction of the linearly polarized light emitted by the packaged light source 200.

[0113] In the test process, first, the analyzer and the packaged light source 200 can be located in the first relative position, then the packaged light source 200 is turned on to emit linearly polarized light, the linearly polarized light is incident on the photoelectric sensor after passing through the analyzer, at this time the photoelectric sensor can obtain I1. Then the analyzer or the packaged light source 200 is rotated to switch the analyzer and the packaged light source 200 to the second relative position, and the packaged light source 200 is turned on again to emit linearly polarized light, the linearly polarized light is incident on the photoelectric sensor after passing through the analyzer, at this time the photoelectric sensor can obtain I2. The first degree of polarization P1 is calculated by using the formula: P1=(I1-I2) / (I1+I2), and the first degree of polarization of the packaged light source 200 is obtained. Then, by judging whether the first degree of polarization meets the threshold value, the detection result of the first degree of polarization of the packaged light source 200 is obtained, including qualified or unqualified.

[0114] In practical use, the image receiver 300 may have certain requirements regarding the polarization effect of its polarizer 320. For example, the second polarization degree cannot be zero, or the second polarization degree needs to be greater than 0.1. Therefore, before assembling the image acquisition device, the second polarization degree of the image receiver 300 needs to be detected. Another aspect of this application provides an image receiver 300 detection device, including a detection light source that emits preset linearly polarized light, where the preset linearly polarized light is linearly polarized light with a known polarization state. The light-emitting side of the detection light source is used to mount the image receiver 300 in any of the above-described image acquisition devices.

[0115] The detection light source and image receiver 300 have switchable first and second relative positions. More precisely, the polarizer 320 of the detection light source and image receiver 300 has switchable first and second relative positions. The main difference between the first and second relative positions is that they rotate relative to each other. The switching method can be manual or automatic. For example, the detection light source or image receiver 300 or the polarizer 320 in the image receiver 300 can be rotated manually or by means of mechanical components (rotating stage, robot, etc.), causing the detection light source and polarizer 320 to rotate relative to each other.

[0116] In the first relative position, the polarization direction of the preset linearly polarized light emitted by the detection light source is the same as the polarization direction of the polarizer 320 of the image receiver 300; while in the second relative position, the polarization direction of the preset linearly polarized light emitted by the detection light source is perpendicular to the polarization direction of the polarizer 320 of the image receiver 300.

[0117] During the test, the detection light source and polarizer 320 are first positioned in a first relative position. Then, the detection light source is turned on to emit preset linearly polarized light. This preset linearly polarized light passes through polarizer 320 and enters image sensor 310, at which point image sensor 310 obtains I3. Next, the detection light source or polarizer 320 is rotated to switch to a second relative position. The detection light source is then turned on again to emit preset linearly polarized light. This preset linearly polarized light passes through polarizer 320 and enters image sensor 310, at which point image sensor 310 obtains I4. Using the formula for calculating the second degree of polarization P2: P2 = (I3 - I4) / (I3 + I4), the second degree of polarization of the image receiver 300 can be obtained. Then, by determining whether the second degree of polarization meets the threshold, the detection result of the second degree of polarization of the image receiver 300 is obtained, including whether it is qualified or unqualified.

[0118] In another aspect, embodiments of this application provide an electronic device, such as... Figure 8As shown, the device body and the image acquisition device including the above-mentioned parts, the image acquisition device includes a light emitting device and a receiving device arranged along the light path, wherein the light emitting device is any of the above-mentioned light sources, and the receiving device is any of the above-mentioned image receivers (excluding the image receiver with the polarizer located between the lens group and the image sensor, in other words, the polarizer 320 in the image acquisition device should be at least not located between the lens group 330 and the image sensor 310).

[0119] Please refer to Figure 8 and Figure 9 As shown, the device body includes a display screen 420, which includes a display module 421 and a light-transmitting cover plate 422. The display module 421 refers to an electronic module capable of displaying images, which generally has two opposite side surfaces, one of which is the display side, and the other is the non-display side. The light-transmitting cover plate 422 is mainly attached to the display side of the display module 421, and its material is usually glass (suitable for hard screens) or light-transmitting flexible material (suitable for flexible screens), which is used to protect the display side of the display module 421.

[0120] Please continue to refer to Figure 8 and Figure 9 As shown, in order to improve the screen-to-body ratio while realizing image acquisition, the display module 421 has a light channel 423 (i.e. the hole part in the display screen 420) extending from the display side to the non-display side. The light emitting element 240 and the image sensor 310 of the image acquisition device are both located on the non-display side of the display module 421, and at least one of the light emitting element 240 and the image sensor 310 corresponds to the opening of the light channel 423 on the non-display side. In this way, the linearly polarized light emitted by the light emitting element 240 can smoothly exit from the light-transmitting cover plate 422 to the target object through the light channel 423, and then be reflected by the target object and smoothly incident on the image sensor 310 through the light-transmitting cover plate 422 and the light channel 423. It should be understood that the number of light channels 423 can be one or more, such as multiple light emitting elements 240 sharing the same light channel 423, or the light emitting element 240 and the image sensor 310 sharing the same light channel 423, or each light emitting element 240 and image sensor 310 corresponds to a light channel 423 (as shown in Figure 9 ).

[0121] As shown in Figure 9As shown, at this time, the area of the light-transmitting cover plate 422 at the light channel 423 can be used to directly form the polarizer 320 and / or the polarization part 210. For example, the first micro-nano grating 211 and / or the second micro-nano grating 321 can be made on the partial area of the light-transmitting cover plate 422 before the light-transmitting cover plate 422 is assembled to form the display screen 420. The first micro-nano grating 211 and the light-transmitting cover plate 422 corresponding to the position form the polarization part 210 as described above, and the second micro-nano grating 321 and the light-transmitting cover plate 422 corresponding to the position form the polarizer 320 as described above. The area of the light-transmitting cover plate 422 with the first micro-nano grating 211 and / or the second micro-nano grating 321 corresponds to the opening of the subsequent light channel 423. In addition, the polarizer 320 and / or the polarization part 210 can also be fixed to the light-transmitting cover plate 422 by bridging or surface pasting.

[0122] In another aspect of the embodiments of the present application, an electronic device is provided, which includes a device main body and an image acquisition apparatus. The image acquisition apparatus includes an emitting device and a receiving device arranged along an optical path. The emitting device is any of the above-mentioned light sources.

[0123] The device main body includes a display screen, which includes a display module and a light-transmitting cover plate. The display module refers to an electronic module capable of displaying a picture. It usually has two opposite side surfaces, one of which is a display side, and the other is a non-display side. The light-transmitting cover plate is mainly attached to the display side of the display module. It is usually made of glass (suitable for hard screens) or light-transmitting flexible material (suitable for flexible screens) to protect the display side of the display module.

[0124] In order to improve the screen-to-body ratio while realizing image acquisition, the display module has a light channel (i.e., a hole cut in the display screen) extending from the display side to the non-display side. The light-emitting element and the receiving device of the image acquisition apparatus are both located on the non-display side of the display module, and at least one of the light-emitting element and the receiving device corresponds to the opening of the light channel on the non-display side. In this way, the linearly polarized light emitted by the light-emitting element can smoothly exit from the light-transmitting cover plate to the target object through the light channel, and then be reflected by the target object and smoothly incident on the receiving device through the light-transmitting cover plate and the light channel. It should be understood that the number of light channels can be one or more. For example, multiple light-emitting elements share the same light channel, or the light-emitting element and the receiving device share the same light channel, or each light-emitting element and the receiving device correspond to a light channel.

[0125] At this time, the area of the light-transmitting cover plate at the light channel can be directly used to form a polarizer. For example, before the light-transmitting cover plate is assembled to form the display screen, a second micro-nano grating can be manufactured on a partial area of the light-transmitting cover plate, where the second micro-nano grating and the light-transmitting cover plate (as a carrier plate) corresponding to the area form the aforementioned polarizer. The area of the light-transmitting cover plate with the second micro-nano grating corresponds to the opening of the subsequent light channel. In addition, the polarizer can also be fixed to the light-transmitting cover plate by means of bridging or surface pasting.

[0126] In another aspect of the embodiments of the present application, an electronic device is provided, which includes a device main body and an image acquisition device. The image acquisition device includes a light-emitting component and a receiving component arranged along a light path. The receiving component is the aforementioned partial image receiver (excluding the image receiver in which the polarizer is located between the lens group and the image sensor).

[0127] The device main body includes a display screen, which includes a display module and a light-transmitting cover plate. The display module refers to an electronic module capable of displaying a picture. It usually has two opposite side surfaces, one of which is a display side, and the other is a non-display side. The light-transmitting cover plate is mainly attached to the display side of the display module. It is usually made of glass (suitable for hard screens) or light-transmitting flexible material (suitable for flexible screens) to protect the display side of the display module.

[0128] In order to improve the screen-to-body ratio while realizing image acquisition, the display module has a light channel (i.e., a hole in the display screen) extending from the display side to the non-display side. The light-emitting component and the image sensor of the image acquisition device are located on the non-display side of the display module, and at least one of the light-emitting component and the image sensor corresponds to the opening of the light channel on the non-display side. In this way, linearly polarized light emitted by the light-emitting component can smoothly exit from the light-transmitting cover plate to the target object through the light channel, and then be reflected by the target object and smoothly incident on the image sensor through the light-transmitting cover plate and the light channel. It should be understood that the number of light channels can be one or more. For example, multiple sub-light-emitting components in the light-emitting component share the same light channel, or the light-emitting component and the image sensor share the same light channel, or each sub-light-emitting component and the image sensor corresponds to one light channel.

[0129] At this time, the area of the light-transmitting cover plate at the light channel can be directly used to form a polarizer. For example, before the light-transmitting cover plate is assembled to form the display screen, a second micro-nano grating can be manufactured on a partial area of the light-transmitting cover plate, where the second micro-nano grating and the light-transmitting cover plate (as a carrier plate) corresponding to the area form the aforementioned polarizer. The area of the light-transmitting cover plate with the second micro-nano grating corresponds to the opening of the subsequent light channel. In addition, the polarizer can also be fixed to the light-transmitting cover plate by means of bridging or surface pasting.

[0130] In another aspect of the embodiments of the present application, an electronic device is provided, which includes a device main body and an image acquisition device. The image acquisition device includes a light-emitting component and a receiving component arranged along a light path. The receiving component is the aforementioned partial image receiver (excluding the image receiver in which the polarizer is located between the lens group and the image sensor).Figure 8 As shown, the electronic device includes a device body and the image acquisition device of any of the above, and the image acquisition device is arranged on the device body.

[0131] The electronic device can be a mobile phone, a tablet computer, a television, a notebook computer, a smart home device (for example, a smart air conditioner, a smart refrigerator, a smart sound box, a smart lamp, or a smart curtain, etc.), a wearable electronic device, a vehicle-mounted device (also referred to as an in-vehicle infotainment), a virtual reality device, etc., and the present application does not make any limitation thereto.

[0132] For example Figure 8 As shown, a mobile phone is shown, which includes a device body and the image acquisition device of the above, the device body includes a back plate, a middle frame 410, a main board, a battery, and a display screen 420, wherein the back plate and the display screen 420 are respectively mounted to opposite sides of the middle frame 410 so as to enclose an internal space, the main board and the battery can be located in the internal space, the battery is used to supply power for the main board, the image acquisition device, and the display screen 420, the display screen 420 is provided with a hole digging part, and the hole digging position is aligned with the positions of the packaged light source 200 and the image receiver 300 in the image acquisition device.

[0133] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A light source, characterized in that, The device includes multiple packaged light sources, each packaged light source including a packaged structure and a light-emitting element built into the packaged structure for emitting initial light. The packaged structure includes a light-blocking part and a polarizing part. The light-blocking part is used to prevent the initial light from being emitted through the light-blocking part. At least a portion of the initial light is emitted through the polarizing part to form linearly polarized light, and the polarization directions of the linearly polarized light emitted by at least two of the packaged light sources are different. Linearly polarized light emitted by multiple encapsulated light sources is reflected by the target object and then sequentially incident on the image receiver.

2. The light source as described in claim 1, characterized in that, The peripheral contour of the polarizing part includes a plurality of straight edges, at least one of which is parallel to the polarization direction of the polarizing part.

3. The light source as described in claim 2, characterized in that, The periphery of the polarizing section is square or rectangular.

4. The light source according to any one of claims 1 to 3, characterized in that, The light-blocking portion includes a frame surrounding the outer periphery of the light-emitting element; The encapsulation structure further includes an encapsulation substrate on which the light-emitting element is fixed, and the encapsulation substrate and the polarizing portion are respectively covered by the openings on opposite sides of the frame.

5. The light source according to any one of claims 1 to 3, characterized in that, One side surface of the polarization section has a first micro-nano grating, which is disposed toward the light-emitting element.

6. The light source according to any one of claims 1 to 3, characterized in that, The number of the multiple encapsulated light sources is two, and the polarization directions of the linearly polarized light emitted by the two encapsulated light sources are perpendicular to each other.

7. The light source as described in claim 6, characterized in that, The polarization directions of the linearly polarized light emitted by the two encapsulated light sources are vertical and horizontal, respectively.

8. The light source according to any one of claims 1 to 3, characterized in that, The light-emitting element is an infrared light-emitting element, and the emission wavelength of the infrared light-emitting element is 940nm.

9. An image receiver, characterized in that, The image sensor includes a polarizer and an image sensor located on the light-emitting side of the polarizer. The polarization direction of the polarizer is the same as the polarization direction of the linearly polarized light emitted by any one of the multiple packaged light sources included in the light source, and the polarization directions of the linearly polarized light emitted by at least two of the packaged light sources are different. The linearly polarized light emitted by the multiple packaged light sources is reflected by the target object and then sequentially incident on the image receiver.

10. The image receiver as claimed in claim 9, characterized in that, The image receiver also includes: A lens group, located on the light-receiving side of the image sensor; A filter unit is located between the lens group and the image sensor.

11. The image receiver as claimed in claim 10, characterized in that, The polarizer is located on the side of the lens group away from the image sensor, and the filter unit and the polarizer are separate components.

12. The image receiver as claimed in claim 10, characterized in that, The polarizer is located between the lens group and the image sensor.

13. The image receiver as claimed in claim 12, characterized in that, The polarizer is located between the filter unit and the image sensor.

14. The image receiver as claimed in claim 12 or 13, characterized in that, The filter unit and the polarizer are separate components; Alternatively, the filtering unit may be a filter, and the filter and the polarizer may share the same carrier plate and be formed on opposite sides of the carrier plate.

15. The image receiver as claimed in claim 13, characterized in that, The polarizer has a second micro-nano grating; The peripheral edge of the polarizer is connected to the image sensor via a bridge structure to form a gap between the polarizer and the image sensor to accommodate the second micro-nano grating. Alternatively, the polarizer may also have a protective layer covering the second micro-nano grating, which is bonded to the image sensor via an adhesive layer.

16. An image acquisition device, characterized in that, It includes a light-emitting device and a receiving device arranged along the optical path, wherein the light-emitting device is a light source as described in any one of claims 1 to 8, and / or the receiving device is an image receiver as described in any one of claims 9 to 15.

17. A light source detection device, characterized in that, It includes a photoelectric sensor and a polarizer, wherein the polarizer is located on the light receiving side of the photoelectric sensor, and the light incident side of the polarizer is used to set any of the packaged light sources as described in any one of claims 1 to 8; The polarizer and the packaged light source have switchable first and second relative positions; At the first relative position, the polarization direction of the analyzer is the same as the polarization direction of the linearly polarized light emitted by the packaged light source; In the second relative position, the polarization direction of the analyzer is perpendicular to the polarization direction of the linearly polarized light emitted by the packaged light source.

18. An image receiver detection device, characterized in that, The system includes a detection light source that emits preset linearly polarized light, wherein the light-emitting side of the detection light source is used to set an image receiver as described in any one of claims 9 to 15. The detection light source and the image receiver have switchable first and second relative positions; At the first relative position, the polarization direction of the preset linearly polarized light is the same as the polarization direction of the polarizer of the image receiver; In the second relative position, the polarization direction of the preset linearly polarized light is perpendicular to the polarization direction of the polarizer of the image receiver.

19. An electronic device, characterized in that, It includes a main body of the device and an image acquisition device as described in claim 16, wherein the image acquisition device is disposed on the main body of the device.

20. An electronic device, characterized in that, The device includes a main body and an image acquisition device. The image acquisition device includes a light-emitting device and a receiving device arranged along the optical path. The light-emitting device is the light source according to any one of claims 1 to 8, and / or the receiving device is the image receiver according to any one of claims 9 to 11. The main body of the device includes a display screen, which includes a display module and a light-transmitting cover plate attached to the display side of the display module. The display module has a light channel extending from the display side to the non-display side. The light-emitting element and / or image sensor of the image acquisition device correspond to the opening of the light channel on the non-display side. The polarizing part and / or polarizer of the image acquisition device are disposed on the light-transmitting cover plate and located at the opening of the light channel on the display side.

Images