Light emission module, depth camera, electronic equipment and anomaly detection method

Abstract

The invention provides a light emitting module, a depth camera, electronic equipment and an anomaly detection method, and belongs to the technical field of electronic equipment. The light emitting module comprises a support structure, a substrate, a light emitter, a first photoelectric detector and a dodging device. The supporting structure comprises a surrounding frame and a mounting plane, the surrounding frame surrounds the upper surface of the substrate along the edge of the upper surface of the substrate, and a dodging device is mounted on a supporting part of the mounting plane; a light emitter and a first photoelectric detector are installed on the upper surface of the substrate, the light emitter is located under the light transmitting window, the first photoelectric detector is located under the shielding part, and when an external light signal is transmitted to the first photoelectric detector along the light transmission path, the shielding part reflects the external light signal; an external optical signal cannot be transmitted to the first photoelectric detector. The first photoelectric detector is shielded through the shielding part, so that an external light signal cannot be transmitted to the first photoelectric detector, and an abnormal dodging device can be detected.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a light emission module, a depth camera, an electronic device and an abnormality detection method. Background Art

[0002] With the advancement of technology, electronic devices use built-in depth cameras to collect 3D (Three Dimensional) information of real target scenes, such as collecting 3D facial images of users, and perform 3D facial recognition, thereby realizing functions such as face unlocking and facial payment. The depth camera may include a light transmitting module and a light receiving module. When performing 3D facial recognition, the light spot of the light signal emitted by the light transmitting module needs to cover the face. If the light homogenizing device is damaged or falls off, the light signal emitted by the light transmitting module will directly hit the human eye, causing eye fatigue, damage and other adverse effects. Therefore, it is necessary to perform abnormal detection on the light homogenizing device of the light transmitting module.

[0003] At present, photoelectric detectors (PD) are mainly used to receive laser signals reflected by the homogenizing device, convert the received reflected light signals into detection photocurrent, and then compare the detection photocurrent with the reference photocurrent when the homogenizing device is in a good state. If the detection photocurrent is less than the reference photocurrent, it can be determined that the homogenizing device is damaged or detached.

[0004] However, a glass cover is generally provided on the outside of the optical emission module, and the glass cover will also reflect the light signal. If the light homogenizing device is damaged or falls off, although the laser signal reflected by the light homogenizing device will be weakened, the laser signal reflected by the glass cover or the transmitted ambient light signal will be enhanced, so that the detection photocurrent obtained by the photodetector after converting the received light signal will not be significantly smaller than the reference photocurrent. Therefore, it is impossible to detect abnormal conditions such as damage or falling off of the light homogenizing device. Summary of the invention

[0005] The embodiments of the present application provide a light emission module, a depth camera, an electronic device and an abnormality detection method, which can accurately detect abnormal conditions such as damage or detachment of a uniform light component. The technical solution is as follows:

[0006] In a first aspect, a light emitting module is provided, the light emitting module comprising: a supporting structure, a substrate, a light emitter, a first photodetector and a light homogenizing device;

[0007] The supporting structure includes a surrounding frame and a mounting plane, wherein the surrounding frame surrounds the upper surface of the substrate along the edge of the upper surface of the substrate, the mounting plane is a plane parallel to the upper surface of the substrate, and the mounting plane includes a supporting component extending from four side walls of the surrounding frame, a light-transmitting window, and a shielding component extending from any side of the supporting component, and the light homogenizing device is mounted on the supporting component;

[0008] The light emitter is installed on the upper surface of the substrate, the light emitter is located directly below the light-transmitting window, and the light-emitting surface of the light emitter faces the light-homogenizing device. The laser signal emitted by the light emitter is transmitted to the light-homogenizing device through the light-transmitting window, so that the light-homogenizing device performs light-homogenizing processing on the penetrating laser signal;

[0009] The first photodetector is also installed on the upper surface of the substrate. The first photodetector is located directly below the shielding component, and the distance between the first photodetector and the light-emitting center of the light emitter is within a first distance range. The first distance range is a distance range in which the first photodetector can receive the laser signal reflected by the light homogenizing device. When an external light signal propagates toward the first photodetector along the light propagation path, the external light signal is reflected by the shielding component and cannot propagate to the first photodetector, so that the first photodetector detects abnormal conditions of the light homogenizing device based on the laser signal reflected by the light homogenizing device.

[0010] In a first possible implementation manner of the first aspect, the minimum distance in the first distance range is a first distance, and the first distance is determined according to a size of the light-transmitting window.

[0011] In a second possible implementation of the first aspect, the maximum distance in the first distance range is the second distance, and the second distance is determined according to the size of the light-transmitting window, the light beam divergence angle of the light emitter, the distance between the light emitter and the light homogenizing device, the thickness of the shielding component, and the distance between the first photodetector and the shielding component.

[0012] In a third possible implementation of the first aspect, the light emission module also includes a second photodetector, which is installed on the upper surface of the substrate and not directly below the shielding component, and the second photodetector is used to detect the shielding state of the light emission module.

[0013] In a fourth possible implementation of the first aspect, the optical emission module also includes a control chip, which is electrically connected to the first photodetector, the second photodetector and the optical emitter, and the control chip is used to control the laser signal emitted by the optical emitter according to the detection result of the first photodetector or the detection result of the second photodetector.

[0014] In a fifth possible implementation manner of the first aspect, the substrate is a ceramic substrate.

[0015] In a sixth possible implementation manner of the first aspect, the laser source in the light emitter is a surface light source.

[0016] In a second aspect, a method for detecting an abnormality is provided. The method is applied to the optical emission module described in the first aspect, and the method comprises:

[0017] The optical transmitter transmits a first laser signal;

[0018] The first photodetector receives a first reflected light signal and converts the first reflected light signal into a first detection photocurrent, wherein the first reflected light signal is a light signal obtained by the light homogenizing device reflecting the first laser signal;

[0019] When the first detection photocurrent is less than the first reference photocurrent and the difference between the first detection photocurrent and the first reference photocurrent exceeds a first threshold, the first photodetector determines that the light homogenizing device is abnormal, and the first reference photocurrent is the photocurrent converted by the first photodetector when the light homogenizing device is in a good state.

[0020] In a first possible implementation manner of the second aspect, after the first photodetector determines that the light homogenizing device is abnormal, the method further includes:

[0021] The first photodetector sends a first notification message to the control chip;

[0022] When receiving the first notification message, the control chip sends a first control instruction to the optical transmitter, where the first control instruction is used to control the optical transmitter to stop transmitting the first laser signal.

[0023] In a second possible implementation manner of the second aspect, the method further includes:

[0024] When the difference between the first detection photocurrent and the first reference photocurrent does not exceed the first threshold, the first photodetector sends a second notification message to the control chip;

[0025] When receiving the second notification message, the control chip sends a second control instruction to the optical transmitter, where the second control instruction is used to control the optical transmitter to transmit a second laser signal, where the power of the second laser signal is greater than the power of the first laser signal.

[0026] In a third possible implementation manner of the second aspect, after the control chip sends the second control instruction to the optical transmitter, the method further includes:

[0027] In the process of the light emitter emitting the second laser signal, the second photodetector receives the second reflected light signal and converts the second reflected light signal into a second detection photocurrent;

[0028] When the second detected photocurrent is greater than the second reference photocurrent, and the difference between the second detected photocurrent and the second reference photocurrent exceeds a second threshold, the second photodetector determines that the light emission module is in a blocked state, and the second reference photocurrent is the photocurrent converted by the second photodetector when the light emission module is not in a blocked state.

[0029] In a fourth possible implementation manner of the second aspect, after the second photodetector determines that the light emitting module is in a shielding state, the method further includes:

[0030] The second photodetector sends a third notification message to the control chip;

[0031] When receiving the third notification message, the control chip sends a third control instruction to the optical transmitter, and the third control instruction is used to control the optical transmitter to stop emitting the second laser signal.

[0032] In a third aspect, a depth camera is provided, the depth camera comprising a light emitting module and a light receiving module, the light emitting module being electrically connected to the light receiving module;

[0033] The optical transmission module is the optical transmission module described in the first aspect, and is used to generate and transmit a uniform light signal;

[0034] The light receiving module is used to receive a reflected light signal obtained when the uniform light signal is reflected by an object.

[0035] In a fourth aspect, an electronic device is provided, comprising a housing, a display screen, and a depth camera, wherein the depth camera is disposed between the housing and the display screen, and the depth camera is the depth camera described in the third aspect.

[0036] In a first possible implementation manner of the fourth aspect, the display screen includes a glass cover plate, and a light emitting surface of the light emitting module in the depth camera faces the glass cover plate.

[0037] In a second possible implementation manner of the fourth aspect, the shell includes a glass cover plate, and a light emitting surface of the light emitting module in the depth camera faces the glass cover plate.

[0038] The beneficial effects of the technical solution provided by the embodiment of the present application are:

[0039] The embodiment of the present application provides a new light emitting module, the support structure of which includes a surrounding frame and a mounting plane, the surrounding frame is used to surround the substrate on which the light emitter and the first photodetector are installed, and form a cavity structure with the substrate, thereby protecting the light emitter and the first photodetector. The mounting plane includes not only a supporting component and a light-transmitting window, but also a shielding component, and the first photodetector is located directly below the shielding component and is completely shielded by the shielding component. When the external light signal propagates along the propagation path of the light to the first photodetector, it cannot propagate to the first photodetector due to the shielding of the shielding component, but is reflected by the shielding component. In this way, the first photodetector will not receive the external light signal, but only receive the laser signal reflected by the light homogenizing device. When the light homogenizing device is damaged or falls off, the laser signal reflected by the light homogenizing device will become weaker, and the reflected light signal received by the first photodetector will become weaker or even disappear, and the corresponding converted detection photocurrent will be significantly reduced, so that the abnormality of the light homogenizing device can be accurately detected according to the change of the detection photocurrent.

[0040] In addition, the light emission module provided in the embodiment of the present application also includes a second photodetector, which is installed on the upper surface of the substrate and is not located directly under the shielding component. The second photodetector can detect the shielding condition of the light emission module. When the light emission module is blocked, the uniform light signal processed by the uniform light device cannot be transmitted out and will be reflected into the light emission module. The first photodetector will not receive the light signal due to the shielding of the shielding component, and the second photodetector is not located directly under the shielding component and can receive the light signal. Since the received light signal is enhanced, the correspondingly converted detection photocurrent increases, so that the light emission module can be detected to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a structural schematic diagram of a light emission module provided by the related technology;

[0043] Figure 2It is a structural schematic diagram of another optical emission module provided by the related technology;

[0044] Figure 3 is a structural schematic diagram of a light emission module provided in an embodiment of the present application;

[0045] Figure 4 is a schematic diagram of a supporting structure provided in an embodiment of the present application;

[0046] Figure 5 is a top view of an installation plane provided in an embodiment of the present application;

[0047] Figure 6 is a schematic cross-sectional view of a light emission module provided in an embodiment of the present application in the X-axis direction;

[0048] Figure 7 is a schematic cross-sectional view of a light emission module provided in an embodiment of the present application in the Y-axis direction;

[0049] Figure 8 is a schematic structural diagram of another optical emission module provided in an embodiment of the present application;

[0050] Fig. 9 is a flow chart of an anomaly detection method provided by an embodiment of the present application;

[0051] Fig.10 A schematic diagram of an abnormality detection process using the optical emission module provided in an embodiment of the present application;

[0052] Fig.11 is another schematic diagram of an abnormality detection process using the optical emission module provided in an embodiment of the present application;

[0053] Fig.12 is a flow chart of another anomaly detection method provided by an embodiment of the present application;

[0054] Fig.13 is another schematic diagram of an abnormality detection process using the optical emission module provided in an embodiment of the present application;

[0055] Fig.14 is a schematic diagram of the structure of a depth camera provided in an embodiment of the present application;

[0056] Fig.15 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0057] Fig.16 It is a schematic diagram of the structure of another electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0059] It can be understood that the terms "each", "multiple", and "any" used in the embodiments of the present application include two or more, each refers to each of the corresponding multiple, and any refers to any one of the corresponding multiple. For example, the multiple words include 10 words, and each word refers to each of the 10 words, and any word refers to any one of the 10 words.

[0060] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0061] Depth cameras that use technologies such as structured light and TOF (Time of flight) can obtain 3D information of real target scenes, support 3D face recognition, target depth measurement, etc., thereby realizing face unlocking, face payment, target detection, focus tracking and other functions. The depth camera includes a light transmitting module and a light receiving module, and the light spot of the laser signal emitted by the light transmitting module of the depth camera used for functions such as 3D face recognition needs to cover the face. If the light homogenizing device of the light transmitting module falls off or is damaged, the laser signal emitted at this time will directly hit the human eye, causing adverse effects such as eye fatigue and damage. In order to detect abnormal conditions of the light homogenizing device in the light transmitting module, the current mainstream solution in the industry is to use a photodetector for detection. Specifically, the detection photocurrent (that is, the PD value) formed by the laser signal reflected by the light homogenizing device can be measured to detect whether the light homogenizing device is damaged or falls off. If the light homogenizer is damaged or falls off, the laser signal reflected by the light homogenizer will become weaker, the light signal received by the photodetector will become weaker, and accordingly, the detection photocurrent converted by the photodetector will also become weaker. Based on the above principle, the detection photocurrent can be compared with the reference photocurrent when the light homogenizer is in good condition, and when the detection photocurrent is less than the reference photocurrent, it is determined that the light homogenizer is damaged or falls off.

[0062] The above detection method using photoelectric detectors has the advantages of simple structure and convenience. However, when the depth camera is actually used, there may be multi-light path interference problems, resulting in inaccurate detection results, or even failure to detect abnormal light homogenization components such as damage or detachment. The multi-light path interference problem may come from inside the light emission module or from outside the light emission module. Specifically, if a glass cover can be set on the outside of the optical emission module, when the light homogenizing device is damaged or falls off, although the laser signal reflected by the light homogenizing device will be weakened, the glass cover will reflect part of the laser signal back to the inside of the optical emission module, resulting in the light signal received by the photodetector not being significantly reduced, and the detection photocurrent obtained by converting the received light signal will not be significantly reduced compared to the reference photocurrent, and based on the detection photocurrent, it may not be possible to detect abnormal conditions such as damage or falling off of the light homogenizing device; if no glass cover is set on the outside of the optical emission module, when the light homogenizing device is damaged or falls off, although the laser signal reflected by the light homogenizing device will be weakened, the external ambient light will propagate into the inside of the optical emission module, resulting in the light signal received by the photodetector not being significantly reduced, and the detection photocurrent obtained by converting the received light signal will not be significantly reduced compared to the reference photocurrent, and based on the detection photocurrent, it may not be possible to detect abnormal conditions such as damage or falling off of the light homogenizing device.

[0063] For the above two situations, the following will combine Figure 1 and Figure 2 Describe in detail. Figure 1 A glass cover is arranged outside the light emission module, wherein: Figure 1 The light homogenizing device shown in Figure (a) is in good condition. Figure 1 The light homogenizing device shown in Figure (b) has fallen off. Figure 1 In Figure (a), the LD emits a laser signal, and part of the laser signal is reflected to the PD via the light homogenizer. The PD receives the reflected light signal from the light homogenizer and converts the received reflected light signal into a detection photocurrent, i.e., the standard PD value. Figure 1 As shown in Figure (b), when the light homogenizing device falls off, although the light homogenizing device no longer reflects the laser signal, the glass cover will reflect the laser signal to the PD. The PD receives the reflected light signal reflected by the glass cover and converts the received reflected light signal into a detection photocurrent. Affected by the reflected light signal of the glass cover, the detection photocurrent converted by the PD is not certain in size from the reference photocurrent when the optical emission module is in good condition. At this time, it may not be possible to identify that the light homogenizing device has fallen off, resulting in inaccurate detection results. Figure 2 There is no glass cover plate outside the light emission module, wherein: Figure 2 The light homogenizing device shown in Figure (a) is in good condition. Figure 2 The light homogenizing device shown in Figure (b) has fallen off. Figure 2In Figure (a), when the light homogenizer is in good condition, the LD emits a laser signal, and part of the laser signal is reflected by the light homogenizer to the PD. The PD receives the laser signal reflected by the light homogenizer and converts the received reflected light signal into a detection photocurrent, i.e., the standard PD value. Figure 2 As shown in Figure (b), when the light homogenizer falls off, although the light homogenizer no longer reflects the laser signal, the optical signal from the external environment can propagate into the optical emission module. Affected by the optical signal from the external environment, the detection photocurrent obtained by PD conversion is not certain with the reference photocurrent when the optical emission module is in good condition. At this time, it may not be possible to identify that the light homogenizer of the optical emission module has fallen off, resulting in inaccurate detection results.

[0064] Through the above Figure 1 and Figure 2 It can be seen that when the related technology uses PD to detect abnormal conditions such as damage or detachment of the homogenizing device, due to the existence of multi-light path interference, the detection results are inaccurate, and there is a risk of misjudgment or even missed judgment. In order to improve the accuracy of the detection results of the homogenizing device, the embodiment of the present application will provide a light emitting module, in which a shielding component is arranged directly above the photodetector in the light emitting module, and the photodetector can be shielded by the shielding component, so that the reflected light signal reflected by the glass cover plate and the light signal of the external environment cannot be transmitted to the photodetector, thereby solving the problem of risk detection failure caused by multi-light path interference, and can effectively identify whether the homogenizing device of the light emitting module is in a risk abnormal state such as detachment or damage, thereby improving the safety of the depth camera.

[0065] The present application embodiment provides a light emission module, see Figure 3 The light emission module includes: a substrate 301, a support structure 302, a light emitter 303, a first photodetector 304 and a homogenizing device 305. The substrate 301 is used to install and support optical elements, and the substrate 301 can be a ceramic substrate, etc. The support structure 302 is used to protect optical elements such as the light emitter 303 and the first photodetector 304 inside the light emission module. A laser is arranged inside the light emitter 303, which can emit a laser signal. The laser belongs to a surface light source, and can be a VCSEL (Vertical-Cavity Surface-Emitting Laser, vertical cavity surface emitting laser), etc. The first photodetector 304 is used to receive the laser signal reflected by the homogenizing device, and convert the received reflected light signal into a detection photocurrent. By comparing the detection photocurrent with the reference photocurrent, it can be detected whether the homogenizing device is damaged or detached. Abnormal conditions. The homogenizing device 305 is used to perform homogenization processing on the penetrating laser signal to obtain a homogenization signal, and the homogenization signal is used to collect a 3D image of the object.

[0066] See also Figure 4 The supporting structure 302 includes a surrounding frame 3021 and a mounting plane 3022. The surrounding frame 3021 surrounds the upper surface of the substrate 301 along the edge of the upper surface of the substrate 301, thereby forming a cavity structure with the upper surface of the substrate. The light emitter 303 and the first photodetector 304 are located in the cavity, which can not only prevent the laser signal emitted by the light emitter 303 from diverging, but also protect the light emitter 303 and the first photodetector 304. Figure 4 The mounting plane 3022 is a plane parallel to the upper surface of the substrate 301, and the size of the mounting plane 3022 can be the same as the size of the substrate 301. To facilitate the identification of the specific structure of the mounting plane 3022, Figure 5 A top view of the mounting plane 3022 is shown, see Figure 5 The mounting plane 3022 includes a supporting component 30221 extending from four side walls of the enclosing frame 3021, a light-transmitting window 30222, and a shielding component 30223 extending from any side of the supporting component 30221. The supporting component 30221 is mounted with a light homogenizing device 305 for supporting the light homogenizing device 305.

[0067] The upper surface of the substrate 301 is provided with a light emitter 303. The light emitting surface of the light emitter 303 faces the light homogenizing device 305, so that the laser signal emitted by the light emitter 303 can be transmitted to the light homogenizing device 305. Since the enclosing frame of the support structure cannot transmit the laser signal, in order to transmit the laser signal, the light emitter 303 can be located directly below the light-transmitting window 30222. When the light emitter 303 transmits the laser signal, the light-transmitting window 30222 transmits the laser signal emitted by the light emitter 303 to the light homogenizing device 305. After receiving the laser signal, the light homogenizing device 305 performs light homogenization processing on the penetrated laser signal to obtain a light homogenization signal.

[0068] A first photodetector 304 is also installed on the upper surface of the substrate 301. The first photodetector 304 is located directly below the shielding component 30223, and the distance between the first photodetector 304 and the light emitting center of the light emitter 303 is within a first distance range, which is a distance range in which the first photodetector 304 can receive the laser signal reflected by the light homogenizing device 305. When an external light signal propagates toward the first photodetector 304 along the light propagation path, the external light signal is reflected by the shielding component 30223 and cannot propagate to the first photodetector 304. Since the interference of the external light signal is isolated, the first photodetector 304 detects the abnormality of the light homogenizing device 305 according to the laser signal reflected by the light homogenizing device 305, thereby improving the accuracy of the detection result. It should be noted here that the external light signal is a light signal propagating toward the inside of the light emitting module, including a light signal of the external environment and a reflection signal obtained by reflecting the laser signal emitted by the light emitter.

[0069] In the embodiment of the present application, the minimum distance in the first distance range is the first distance, which can be determined according to the size of the light-transmitting window 30222. The maximum distance in the first distance range is the second distance, which is determined according to the size of the light-transmitting window 30222, the beam divergence angle of the light emitter 303, the distance between the light emitter 303 and the light homogenizing device 305, the thickness of the shielding component 30223, the distance between the first photodetector 304 and the shielding component 30223, and the like.

[0070] Among them, the size of the light-transmitting window 30222 refers to the distance between the center of the light emitter 303 and the shielding component 30223. The light beam divergence angle of the light emitter 303 belongs to the device parameter of the laser and is determined by the properties of the laser itself. Considering that the light source in the light emitter 303 is a surface light source, it will emit a laser signal to the plane where the XY axis is located, and the laser signal reflected by the light homogenizing device 305 received by the first photodetector 304 originates from the plane where the XY axis is located. In this way, when the first photodetector 304 is blocked by the shielding component 30223, it is necessary to consider the first distance range between the first photodetector 304 and the light emitter 303 in the X-axis direction, and the first distance range between the first photodetector 304 and the light emitter 303 in the Y-axis direction. The determination process of the first distance range in the above two cases will be introduced respectively below.

[0071] When calculating the first distance range between the first photodetector 304 and the light emitter 303 in the X-axis direction, a cross-sectional view of the light emission module along the X-axis direction may be obtained, and then calculation is performed based on the cross-sectional view. Figure 6 , Figure 6 Figure (a) is a top view of the light emission module, and the AA direction is the X-axis cross-sectional direction. Figure 6Figure (b) is a cross-sectional view of the light emitting module in the X-axis direction. Figure 6 In Figure (b), the size of the light-transmitting window 30222 of the light-emitting module is Dx, and the beam divergence angle of the light emitter 303 is The distance between the light emitter 303 and the light homogenizing device 305 is H, the thickness of the shielding component 30223 is t, and the distance between the first photodetector 304 and the shielding component 30223 is L. To prevent the external light signal from propagating to the first photodetector 304, the closest distance between the first photodetector 304 and the light emission center of the light emitter 303 in the X-axis direction is the size Dx of the light-transmitting window 30222, that is, the first distance is Dx, at which time the first photodetector 304 is located at the edge of the shielding component 30223. The farthest distance between the first photodetector 304 and the light emission center of the light emitter 303 is the distance when the first photodetector 304 can just receive the laser signal reflected by the light homogenizing device 305, that is, the second distance. At this time, if the first photodetector 304 is further away from the light emitter 303, it will not be able to receive the laser signal reflected by the light homogenizing device 305. The calculation process of the second distance is as follows: Assume that the shortest distance between the intersection of the laser signal emitted by the light emitter 303 on the light homogenizing device 305 and the shielding component 30223 is Sx, then according to the distance H between the light emitter 303 and the light homogenizing device 305, the beam divergence angle of the light emitter 303 It can be calculated Assuming that the angle between the farthest light beam emitted by the light emitter 303 and the shielding component 30223 after being reflected by the light homogenizing device 305 is θx, then according to Sx and t, the trigonometric relationship can be used to calculate Assuming that the distance between the first photodetector 304 and the shielding component 30223 in the Y-axis direction is M, according to the distance L between the first photodetector 304 and the shielding component 30223 and tanθx, it can be known from the trigonometric relationship that tanθx=L / M, then Therefore, the second distance can be obtained as

[0072] When calculating the first distance range between the first photodetector 304 and the light emitter 303 in the Y-axis direction, a cross-sectional view of the light emission module along the Y-axis direction may be obtained, and then calculation is performed based on the cross-sectional view. Figure 7 , Figure 7 Figure (a) is a top view of the light emission module, and the BB direction is the Y-axis cross-sectional direction. Figure 7 Figure (b) is a cross-sectional view of the light emitting module in the Y-axis direction. Figure 7 In Figure (b), the size of the light-transmitting window 30222 of the light-emitting module is Dy, and the beam divergence angle of the light emitter 303 is The distance between the light emitter 303 and the light homogenizing device 305 is H, the thickness of the shielding component 30223 is t, and the distance between the first photodetector 304 and the shielding component 30223 is L. To prevent the external light signal from propagating to the first photodetector 304, the closest distance between the first photodetector 304 and the light emission center of the light emitter 303 in the Y-axis direction is the size Dy of the light-transmitting window 30222, that is, the first distance is Dy, at which time the first photodetector 304 is located at the edge of the shielding component 30223. The farthest distance between the first photodetector 304 and the light emission center of the light emitter 303 is the distance at which the first photodetector 304 can just receive the laser signal reflected by the light homogenizing device 305, that is, the second distance. At this time, if the first photodetector 304 is further away from the light emitter 303, it will not be able to receive the laser signal reflected by the light homogenizing device 305. The calculation process of the second distance is as follows: Assume that the shortest distance between the intersection of the laser signal emitted by the light emitter 303 on the light homogenizing device 305 and the shielding component 30223 is Sy, then according to the distance H between the light emitter 303 and the light homogenizing device 305, the beam divergence angle of the light emitter 303 It can be calculated Assuming that the angle between the farthest light beam emitted by the light emitter 303 and the shielding component 30223 after being reflected by the light homogenizing device 305 is θy, then according to Sy and t, the trigonometric relationship can be used to calculate Assuming that the distance between the first photodetector 304 and the shielding component 30223 in the X-axis direction is N, according to the distance L between the first photodetector 304 and the shielding component 30223 and tanθy, it can be known from the trigonometric relationship that tanθy=L / N, then Therefore, the second distance can be obtained as

[0073] In the embodiment of the present application, the number of the first photodetector 304 is at least one, and at least one first photodetector 304 is mounted on the upper surface of the substrate 301 and is located directly below the shielding component 30223. By using the shielding component 30223 for shielding, the influence of external light signals on the first photodetector 304 can be isolated, so that when the light homogenizing device 305 is damaged or detached, the abnormality of the light homogenizing device 305 can be detected according to the change of the detected photocurrent. Furthermore, even if the light homogenizing device 305 is in good condition, due to the shielding of the shielding component 30223, other interfering light signals can be isolated, thereby improving the accuracy of the detection result.

[0074] See also Figure 8, the light emission module provided in the embodiment of the present application also includes a second photodetector 306, which is installed on the upper surface of the substrate 301 and is not directly below the shielding component 30223. The second photodetector 306 is used to detect the shielding state of the light emission module. When the light emission module is blocked by an obstruction such as a user's hand, the homogenized light signal after the homogenization device 305 is irradiated to the user's hand, and cannot be transmitted through the user's hand, but will be reflected into the inside of the light emission module and propagated along the optical broadcast path to the second photodetector 306, so that the reflected light signal received by the second photodetector 306 is enhanced, and the corresponding converted detection light signal will also increase. The second photodetector 306 of the embodiment of the present application can detect the shielding state of the light emission module by receiving the reflected light signal and converting the received reflected light signal into a detection photocurrent. When the detection photocurrent converted by the second photodetector 306 becomes larger, it can be determined that the light emission module is blocked.

[0075] In another embodiment of the present application, the optical emission module further includes a control chip, which is connected to the first photodetector 304, the second photodetector 306 and the optical emitter 303, and the control chip is used to control the laser signal emitted by the optical emitter 303 according to the detection result of the first photodetector or the detection result of the second photodetector. Specifically, when the detection result of the first photodetector 304 is that the light homogenizing device 305 is damaged or detached, in order to avoid the laser signal emitted by the optical emission module from causing damage to the user's face, especially the eyes, the control chip can send a control instruction to the optical emitter 303 based on the detection result of the first photodetector 304, so that the optical emitter 303 stops emitting the laser signal; when the detection result of the second photodetector 306 is that the optical emission module is blocked, in order to avoid the laser signal emitted by the optical emission module from damaging the user's hand, the control chip can send a control instruction to the optical emitter 303 based on the detection result of the second photodetector 306, so that the optical emitter 303 stops emitting the laser signal.

[0076] The optical emission module provided by the embodiment of the present application can not only detect whether the light homogenizing device is in an abnormal state, but also detect whether the optical emission module is in a blocked state, thereby controlling the laser signal emitted by the optical transmitter according to the detection result, thereby improving the safety of the use of the optical emission module.

[0077] In addition, the light emission module in the related art generally adopts an integrated ceramic (High Temperature Co-fired Ceramic, referred to as HTTC) process packaging, and the integrated ceramic process packaging cannot adapt to the shielding solution for the first photodetector. In order to adapt to the shielding solution for the first photodetector, the embodiment of the present application can adopt a non-integrated process such as the LHA process to replace the HTTC process for packaging.

[0078] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0079] The present application embodiment provides a flowchart of an abnormality detection method. Figures 3 to 8 The light emission module shown in the embodiment of the present application is used as an example, see Fig. 9 , the method flow provided in the embodiment of the present application includes:

[0080] 901. An optical transmitter transmits a first laser signal.

[0081] In the embodiment of the present application, the power of the laser signal emitted by the optical transmitter is relatively high. In order to prevent the laser signal emitted by the optical transmitter from causing damage to the user's eyes due to abnormal conditions such as damage or falling off of the light homogenizing device, the embodiment of the present application uses a light emitting module to perform abnormal detection on damage, falling off, etc. of the light homogenizing device. The light transmitter can be controlled to emit a first laser signal with a relatively low power. Even if the light homogenizing device of the light emitting module is abnormal, the emitted first laser signal will not cause damage to the user's eyes.

[0082] 902. A first photodetector receives a first reflected light signal and converts the first reflected light signal into a first detection photocurrent.

[0083] After the light transmitter emits the first laser signal, the emitted first laser signal reaches the light homogenizer along the light propagation path. A part of the first laser signal penetrates the light homogenizer and is homogenized by the light homogenizer to obtain a light homogenizer signal, which is used to collect 3D information of the real target scene, such as the user's 3D face image, so as to perform 3D face recognition. Another part of the first laser signal is reflected by the light homogenizer to form a first reflected light signal. The first photodetector receives the first reflected light signal and converts the received first laser signal into a first detection light signal.

[0084] 903. When the first detection photocurrent is less than the first reference photocurrent and the difference between the first detection photocurrent and the first reference photocurrent exceeds a first threshold, the first photodetector determines that the light homogenizing device is abnormal.

[0085] In the embodiment of the present application, since the first photodetector is blocked by the blocking component and will not receive external light signals, if the light homogenizing device is damaged or falls off, the first laser signal reflected by the light homogenizing device will be reduced, or even will not reflect the first laser signal. At this time, the first reflected light signal received by the first photodetector is reduced, and the first detection photocurrent obtained by the first photodetector based on the conversion of the first reflected light signal will also be reduced. Therefore, according to the size of the first detection photocurrent, the first photodetector can detect whether the light homogenizing device is damaged or falls off, or other abnormal conditions.

[0086] Specifically, based on the converted first detection photocurrent, the first photodetector compares the first detection photocurrent with the first reference photocurrent. If the first detection photocurrent is less than the first reference photocurrent, and the difference between the first detection photocurrent and the first reference photocurrent exceeds the first threshold, the first photodetector can determine that the light homogenizing device is abnormal. The first reference photocurrent is the photocurrent converted by the first photodetector when the light homogenizing device is in good condition. The first threshold is the error between the detection photocurrent actually converted by the first photodetector and the first reference photocurrent when the light homogenizing device is in good condition, which can be set by technicians based on experience.

[0087] Furthermore, after the first photodetector determines that the light homogenizing device is abnormal, in order to avoid the emitted first laser signal from burning the user's eyes, the first photodetector will also send a first notification message to the control chip. The first notification message is used to indicate to the control chip that the light homogenizing device is damaged or detached, or other abnormal conditions. When the first notification message is received, the control chip can send a first control instruction to the optical transmitter. When the first control instruction is received, the optical transmitter stops emitting the first laser signal.

[0088] In another embodiment of the present application, the first photodetector compares the first detection light signal with the first reference light signal. When the difference between the first detection light signal and the first reference light current does not exceed the first threshold value, the first photodetector can determine that the light homogenizing device is in good condition and has not experienced abnormal conditions such as damage or falling off. Considering that the greater the power of the laser signal emitted by the optical transmitter, the greater the intensity of the homogenizing signal obtained by the laser signal after homogenizing, the higher the clarity of the 3D information of the real target scene acquired based on the homogenizing signal, and when the light homogenizing device is detected for abnormality, the intensity of the first laser signal emitted by the optical transmitter is relatively weak. In order to be able to acquire 3D information of the real target scene with higher clarity, the optical transmitter needs to emit a laser signal with a relatively high power. Therefore, when it is determined that the light homogenizing device is in good condition, the first photodetector can send a second notification message to the control chip, and the second notification message is used to notify the control chip that the light homogenizing device is in good condition and has not experienced abnormal conditions such as damage or falling off. When receiving the second notification message, the control chip may send a second control instruction to the optical transmitter. When receiving the second control instruction, the optical transmitter transmits a second laser signal, and the power of the second laser signal is greater than the power of the first laser signal.

[0089] The abnormality detection method provided in the embodiment of the present application can be executed each time the light emission module is used to collect 3D information of a real target scene, thereby preventing abnormal conditions such as damage or detachment of the light homogenizing device from causing adverse effects on the user's eyes.

[0090] The anomaly detection method provided in the embodiment of the present application will be combined with Fig.10 and Fig.11 Provide explanation.

[0091] Fig.10 The light emitting module shown in the figure is not provided with a glass cover plate on the outside. Fig.10 The light homogenizing device of the optical transmission module shown in Figure (a) is normal. Fig.10 The light homogenizing device of the optical transmission module shown in Figure (b) has fallen off. Fig.10 In Figure (a), when the light homogenizing device of the optical emission module is in good condition, the first laser signal emitted by the LD (i.e., the light emitter) is reflected by the light homogenizing device to obtain a first reflected light signal, and the PD1 (i.e., the first photodetector) receives the first reflected light signal and converts the first reflected light signal into a first detection photocurrent (i.e., the standard PD value). Fig.10In Figure (b), when the light homogenizing device of the optical emission module is damaged or falls off, since there is no glass cover on the outside of the optical emission module, the first laser signal emitted by the LD is directly transmitted to the outside of the optical emission module, and PD1 is located directly below the shielding component. The external ambient light signal is reflected by the shielding component and cannot be transmitted to PD1. The first reflected light signal received by PD1 is weakened, and the first detection photocurrent converted from the first reflected light signal will decrease. By comparing the first detection photocurrent with the first reference photocurrent, it can be determined that the light homogenizing device is damaged or falls off.

[0092] Fig.11 The light emitting module shown is provided with a glass cover plate outside. Fig.11 The light homogenizing device of the optical transmission module shown in Figure (a) is normal. Fig.11 The light homogenizing device of the optical transmission module shown in Figure (b) has fallen off. Fig.11 In Figure (a), when the light homogenizing device of the optical transmitter module is in good condition, a part of the first laser signal emitted by the LD (i.e., the light transmitter) passes through the light homogenizing device and is processed by the light homogenizing device to obtain a light homogenizing signal. Another part of the first laser signal emitted by the LD (i.e., the light transmitter) is reflected by the light homogenizing device to obtain a first reflected light signal. Since the light homogenizing signal is reflected by the glass cover plate and the external ambient light signal that passes through the glass cover plate is reflected by the shielding component and cannot reach PD1 (i.e., the first photodetector), PD1 only receives the first reflected light signal and then converts the first reflected light signal into the first detection photocurrent (i.e., the standard PD value). See Fig.11 In Figure (b), when the light homogenizing device of the optical transmission module is damaged or detached, the first laser signal emitted by the LD (i.e., the optical transmitter) is not reflected by the light homogenizing device but directly irradiates the glass cover plate. The glass cover plate reflects the first laser signal, and the reflected laser signal is reflected by the blocked component and cannot be transmitted to PD1. The first reflected light signal received by PD1 is weakened, and the first detection photocurrent converted from the first reflected light signal is also reduced. It can be determined that the light homogenizing device is damaged or detached.

[0093] The method provided in the embodiment of the present application can avoid the influence of external ambient light signals on the detection of the light homogenizing device, accurately detect the abnormal situation of the light homogenizing device, and make the detection result more accurate.

[0094] The present application embodiment provides a flowchart of an abnormality detection method. Figures 3 to 8 The light emission module shown in the embodiment of the present application is used as an example, see Fig.12 , the method flow provided in the embodiment of the present application includes:

[0095] 1201. A second photodetector receives a second reflected light signal, and converts the second reflected light signal into a second detection photocurrent.

[0096] The second reflected light signal includes all reflected light signals that can be received by the second photodetector, and the second reflected light signal may include a light signal reflected by a light homogenizing device, a light signal reflected by a glass cover plate, and the like.

[0097] 1202. When the second detection photocurrent is greater than the second reference photocurrent and the difference between the second detection photocurrent and the second reference photocurrent exceeds a second threshold, the second photodetector determines that the light emission module is in a shielding state.

[0098] When the light emitting module is blocked and a glass cover is provided on the outside of the light emitting module, if the light homogenizing device is damaged, detached or other abnormal conditions occur, the laser signal emitted by the light emitter is irradiated onto the glass cover. Since the light emitting module is blocked, the laser signal cannot be emitted and is reflected into the light emitting module by the obstruction, thereby enhancing the reflected light signal received by the second photodetector and increasing the detection photocurrent obtained by conversion; when the light emitting module is blocked and a glass cover is not provided on the outside of the light emitting module, if the light homogenizing device is damaged, detached or other abnormal conditions occur, the laser signal emitted by the light emitter cannot be emitted and is reflected into the light emitting module by the obstruction, thereby enhancing the reflected light signal received by the second photodetector and increasing the detection photocurrent obtained by conversion; when the light emitting module is blocked and a glass cover is not provided on the outside of the light emitting module When there is a glass cover, if the light homogenizing device is normal and there is no abnormality such as damage or falling off, the laser signal emitted by the light emitter is processed by the light homogenizing device to obtain a homogenizing signal. Since the light emission module is blocked, the homogenizing signal cannot be emitted and is reflected by the obstruction into the light emission module, resulting in an enhancement of the reflected light signal received by the second photodetector, and a larger detection photocurrent is obtained by conversion; when the light emission module is blocked and a glass cover is provided outside the light emission module, if the light homogenizing device is normal and there is no abnormality such as damage or falling off, the laser signal emitted by the light emitter is processed by the light homogenizing device to obtain a homogenizing signal. Since the light emission module is blocked, the homogenizing signal cannot be emitted and is reflected by the obstruction into the light emission module, resulting in an enhancement of the reflected light signal received by the second photodetector, and a larger detection photocurrent is obtained by conversion. That is, regardless of whether the light homogenizing device in the light emission module is damaged or detached or other abnormal conditions occur, and whether a glass cover is provided on the outside of the light emission module, when the light emission module is blocked, the second detection photocurrent converted by the second photodetector will increase. Therefore, whether the light emission module is blocked can be judged based on whether the second detection photocurrent increases.

[0099] Specifically, the second photodetector receives the second reflected light signal, converts the second reflected light signal into a second detection photocurrent, and compares the second detection photocurrent with the second reference photocurrent. When the second detection photocurrent is greater than the second reference photocurrent, and the difference between the second detection photocurrent and the second reference photocurrent exceeds the second threshold, the second photodetector can determine that the light emission module is in a blocked state. The second reference photocurrent is the photocurrent converted by the second photodetector when the light emission module is not in a blocked state. The second threshold is the error between the detection photocurrent actually converted by the second photodetector and the second reference photocurrent when the light emission module is not in a blocked state, which can be set by technicians based on experience.

[0100] Furthermore, after the second photodetector determines that the light emitting module is in a blocked state, in order to prevent the laser signal of the light emitter from burning the user's skin, the second photodetector will also send a third notification message to the control chip. The third notification message is used to notify the control chip that the light emitting module is blocked. When the third notification message is received, the control chip can send a third control instruction to the light emitter. When the third control instruction is received, the light emitter can stop emitting the laser signal.

[0101] Furthermore, in order to more accurately control the laser signal emitted by the optical transmitter, after comparing the second detection photocurrent with the second reference photocurrent, the second photodetector can also determine the damage level of the laser signal emitted by the optical transmitter to the user's skin according to the difference between the second detection photocurrent and the second reference photocurrent, and then carry the determined damage level in the third notification message and send it to the control chip. After receiving the third notification message, the control chip determines the control method of the optical transmitter according to the damage level, thereby controlling the laser signal emitted by the optical transmitter by sending a third control instruction to the optical transmitter. Specifically, if the damage level of the laser signal emitted by the optical transmitter to the user's skin is high, the control method of the optical transmitter can be determined to stop emitting the laser signal; if the damage level of the laser signal emitted by the optical transmitter to the user's skin is low, the control method of the optical transmitter can be determined to reduce the power of the emitted laser signal.

[0102] The anomaly detection method provided in the embodiment of the present application will be combined with Fig.13 Provide explanation.

[0103] See also Fig.13, a glass cover is provided on the outside of the optical emission module, and the light homogenizing device in the optical emission module is normal and does not appear abnormal conditions such as damage or detachment. LD emits a laser signal, a part of the laser signal is reflected by the light homogenizing device, and the reflected signal can be transmitted to PD1 and PD2 along the light propagation path, and the other part of the laser signal penetrates the light homogenizing device, and is processed by the light homogenizing device to obtain a light homogenizing signal. Due to the existence of an obstruction outside the glass cover, the light homogenizing signal cannot be transmitted, but is reflected into the optical emission module. Since PD1 is located directly below the obstruction component, the light signal reflected by the glass cover cannot be transmitted to PD1, and PD2 is not located directly below the obstruction component, so the light signal reflected by the glass cover can be transmitted to PD2, and the second reflected light signal received by PD2 is enhanced, and the converted second detection photocurrent becomes larger. When the second detection photocurrent is compared with the second reference photocurrent, the second detection photocurrent is greater than the second reference photocurrent, and the difference between the second detection photocurrent and the second reference photocurrent is greater than the second threshold value. Therefore, it can be determined that the optical emission module is in an obstructed state.

[0104] The method provided in the embodiment of the present application can detect whether the light emitting module is in a blocked state, thereby controlling the laser signal emitted by the light emitter according to the state of the light emitting module, thereby avoiding damage to the user's skin and improving the safety of the use of the light emitting module.

[0105] The present application embodiment provides a depth camera, see Fig.14 The depth camera includes a light emitting module 1401 and a light receiving module 1402 , and the light emitting module 1401 is electrically connected to the light receiving module 1402 .

[0106] Among them, the light emission module 1401 can be Figures 3 to 8 Any optical transmission module shown in , the optical transmission module is used to generate and transmit a uniform light signal.

[0107] The light receiving module 1402 is used to receive the light signal reflected by the object when the uniform light signal is reflected. The light signal is used to collect 3D information of the real target scene, such as collecting the 3D face image of the user, so as to realize the 3D face recognition function of the depth camera.

[0108] The depth camera described in the embodiment of the present application can be used as an independent camera or installed as a camera module inside an electronic device.

[0109] The present application embodiment provides an electronic device, see Fig.15 The electronic device includes a housing 1501, a display screen 1502 and a depth camera 1503. The depth camera 1503 can be disposed between the housing 1501 and the display screen 1502 as a functional module. The depth camera 1503 can be Fig.14 The depth camera shown.

[0110] In order to protect the optical components in the depth camera, a glass cover is usually set outside the depth camera. To realize the photo function of the depth camera, the light emitting surface of the light emitting module in the depth camera faces the glass cover, and the light incident surface of the light receiving module in the depth camera also faces the glass cover.

[0111] Considering that the cameras in the electronic device include the front camera and the rear camera, and the depth camera as the camera component in the electronic device can be both front and rear, and when the depth camera is used as the front camera and the depth camera is used as the rear camera, the structure of the electronic device is different. Fig.16 In FIG. 1503, when the depth camera is a rear camera of an electronic device, the housing 1501 of the electronic device includes a glass cover plate, and the light emitting surface of the light emitting module in the depth camera 1503 faces the glass cover plate. Fig.16 In Figure (b), when the depth camera is the front camera of the electronic device, the display screen 1502 of the electronic device includes a glass cover plate, and the light emitting surface of the light emitting module in the depth camera 1503 faces the glass cover plate.

[0112] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light emitting module, characterized in that: The light emitting module comprises: a supporting structure, a substrate, a light emitter, a first photodetector and a light homogenizing device; The supporting structure includes a surrounding frame and a mounting plane, wherein the surrounding frame surrounds the upper surface of the substrate along the edge of the upper surface of the substrate, the mounting plane is a plane parallel to the upper surface of the substrate, and the mounting plane includes a supporting component extending from four side walls of the surrounding frame, a light-transmitting window, and a shielding component extending from any side of the supporting component, and the light homogenizing device is mounted on the supporting component; The light emitter is installed on the upper surface of the substrate, the light emitter is located directly below the light-transmitting window, and the light-emitting surface of the light emitter faces the light-homogenizing device. The laser signal emitted by the light emitter is transmitted to the light-homogenizing device through the light-transmitting window, so that the light-homogenizing device performs light-homogenizing processing on the penetrating laser signal; The first photodetector is also installed on the upper surface of the substrate. The first photodetector is located directly below the shielding component, and the distance between the first photodetector and the light-emitting center of the light emitter is within a first distance range. The first distance range is a distance range in which the first photodetector can receive the laser signal reflected by the light homogenizing device. When an external light signal propagates toward the first photodetector along the light propagation path, the external light signal is reflected by the shielding component and cannot propagate to the first photodetector, so that the first photodetector detects abnormal conditions of the light homogenizing device based on the laser signal reflected by the light homogenizing device.

2. The light emitting module according to claim 1, characterized in that: The minimum distance in the first distance range is the first distance, and the first distance is determined according to the size of the light-transmitting window.

3. The light emitting module according to claim 1, characterized in that: The maximum distance in the first distance range is the second distance, and the second distance is determined according to the size of the light-transmitting window, the beam divergence angle of the light emitter, the distance between the light emitter and the light homogenizing device, the thickness of the shielding component, and the distance between the first photodetector and the shielding component.

4. The light emitting module according to claim 1, characterized in that: The light emitting module further includes a second photodetector, which is mounted on the upper surface of the substrate and is not directly below the shielding component. The second photodetector is used to detect the shielding state of the light emitting module.

5. The light emitting module according to claim 4, characterized in that: The optical emission module also includes a control chip, which is electrically connected to the first photodetector, the second photodetector and the optical emitter, and is used to control the laser signal emitted by the optical emitter according to the detection result of the first photodetector or the detection result of the second photodetector.

6. The optical emission module according to any one of claims 1 to 5, characterized in that: The substrate is a ceramic substrate.

7. The optical emission module according to any one of claims 1 to 5, characterized in that: The laser source in the light emitter is a surface light source.

8. An anomaly detection method, characterized in that: The method is applied to the optical emission module according to any one of claims 1 to 7, and the method comprises: The optical transmitter transmits a first laser signal; The first photodetector receives a first reflected light signal and converts the first reflected light signal into a first detection photocurrent, wherein the first reflected light signal is a light signal obtained by the light homogenizing device reflecting the first laser signal; When the first detection photocurrent is less than the first reference photocurrent and the difference between the first detection photocurrent and the first reference photocurrent exceeds a first threshold, the first photodetector determines that the light homogenizing device is abnormal, and the first reference photocurrent is the photocurrent converted by the first photodetector when the light homogenizing device is in a good state.

9. The method according to claim 8, characterized in that After the first photoelectric detector determines that the light homogenizing device is abnormal, the method further includes: The first photodetector sends a first notification message to the control chip; When receiving the first notification message, the control chip sends a first control instruction to the optical transmitter, where the first control instruction is used to control the optical transmitter to stop transmitting the first laser signal.

10. The method according to claim 8, characterized in that The method further comprises: When the difference between the first detection photocurrent and the first reference photocurrent does not exceed the first threshold, the first photodetector sends a second notification message to the control chip; When receiving the second notification message, the control chip sends a second control instruction to the optical transmitter, where the second control instruction is used to control the optical transmitter to transmit a second laser signal, where the power of the second laser signal is greater than the power of the first laser signal.

11. The method according to claim 8, characterized in that: The method further comprises: The second photodetector receives a second reflected light signal and converts the second reflected light signal into a second detection photocurrent; When the second detected photocurrent is greater than the second reference photocurrent, and the difference between the second detected photocurrent and the second reference photocurrent exceeds a second threshold, the second photodetector determines that the light emission module is in a blocked state, and the second reference photocurrent is the photocurrent converted by the second photodetector when the light emission module is not in a blocked state.

12. The method according to claim 11, characterized in that After the second photoelectric detector determines that the light emitting module is in a shielding state, the method further includes: The second photodetector sends a third notification message to the control chip; When receiving the third notification message, the control chip sends a third control instruction to the optical transmitter, where the third control instruction is used to control the optical transmitter to stop transmitting the second laser signal.

13. A depth camera, characterized in that: The depth camera includes a light emitting module and a light receiving module, and the light emitting module is electrically connected to the light receiving module; The optical transmission module is the optical transmission module according to any one of claims 1 to 7, used to generate and transmit a uniform light signal; The optical receiving module is used to receive an optical signal obtained by reflecting the uniform light signal from an object.

14. An electronic device, characterized in that: The electronic device includes a housing, a display screen, and a depth camera. The depth camera is disposed between the housing and the display screen. The depth camera is the depth camera as claimed in claim 13.

15. The electronic device according to claim 14, characterized in that: The display screen includes a glass cover plate, and the light emitting surface of the light emitting module in the depth camera faces the glass cover plate.

16. The electronic device according to claim 14, characterized in that: The shell includes a glass cover plate, and the light emitting surface of the light emitting module in the depth camera faces the glass cover plate.

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