VCSEL light source module and TOF module

Abstract

The invention relates to a VCSEL light source module and a TOF module, the VCSEL light source module comprises at least two light source arrays, the at least two light source arrays are arranged in parallel, each light source array comprises at least two light emitting units, and the light emitting units are arranged at intervals and connected in series; and the control assembly is electrically connected with each light source array and controls the output power of the light emitting unit according to the external environment. According to the scheme of the invention, by setting the arrangement mode of the plurality of light source arrays in the VCSEL light source module, such as an anti-distortion array arrangement or a uniform arrangement mode, the light source arrays are projected through the TX module to form a uniform-density light spot field, the overall projected light spots are uniformly distributed, the light spot density is consistent, and the light spot density is uniform. And the phenomena that the number of edge effective point clouds is reduced and the distance measurement accuracy is reduced due to distortion caused by increase of the emission angle are effectively improved.

Description

Technical Field

[0001] This application relates to the field of chip architecture design, and particularly to a VCSEL light source module and a TOF module. Background Art

[0002] Currently, with the popularization and development of 3D cameras, depth vision technologies represented by TOF (Time of Flight) technology have gradually attracted more attention from practitioners. The TOF imaging system obtains the depth information of the object to be measured by receiving the flight time of the modulated light between the target and the receiving end.

[0003] However, for targets with a large absorption rate, the reflected light of the TOF laser will be relatively weak, and phenomena such as depth loss or poor accuracy are likely to occur. To solve this problem, existing solutions often use Vertical-Cavity Surface-Emitting Lasers (VCSELs) in combination with Diffractive Optical Elements (DOEs) to increase the array density of the transmitting end, thereby increasing the resolution of the entire ranging system. However, as the emission angle and detection distance increase, problems such as low edge brightness and a small number of effective point clouds will occur in the TOF system of this solution.

[0004] The inventor found that this problem is, on the one hand, because of the limitation of the lens RI (Relative Illumination), the edge brightness of the TOF ranging system is relatively lower than that of the middle position, and the edge brightness is poor. In actual use, it is manifested as a small number of effective point clouds at the edge of the object to be measured, and the calibration accuracy of the system is poor. In long-distance applications, there is even a phenomenon that the number of effective point clouds at the edge is too sparse to perform ranging; on the other hand, as the emission angle increases, the light spot is prone to distortion after being projected by the optical devices of the TX projection module, such as pincushion distortion, as Figure 1 shown, resulting in a small number of effective points at the edge position of the TX light spot, that is, the phenomenon that the number of light spots is inconsistent between the center and the edge, resulting in the inability to obtain depth information or inaccurate depth information. As Figure 2 shown, at the receiving end lens RI of a typical TOF system, the edge RI is relatively lower than the center. When receiving light spots with the same light intensity, its edge brightness is relatively lower than the center. In actual applications, there will be a small number of edge point clouds and low accuracy in the backend application. During actual ranging, there are still many scattered spots outside the effective ranging range, but the effective information of the scattered spot number in the edge area is less, which is an energy waste.

[0005] In the existing technical solutions, in order to increase the number of effective point clouds for long-distance ranging, it is often achieved by increasing the output power of the VCSEL. However, such a method will increase the overall power consumption of the module, and it is less friendly to devices powered by independent power supplies. Summary of the Invention

[0006] In view of the problems existing in the prior art, such as low edge brightness of the TOF system, few effective point clouds for far targets, and high power consumption, which are urgent problems to be solved at present, this application proposes a completely new solution.

[0007] According to the first aspect of the present application, there is provided a VCSEL light source module, characterized in that it includes:

[0008] At least two light source arrays, the at least two light source arrays are arranged side by side, and each light source array includes at least two light-emitting units, and the light-emitting units are arranged at intervals and connected in series;

[0009] A control component, electrically connected to each light source array, and controlling the output power of the light-emitting unit according to the external environment.

[0010] Among them, the control component includes:

[0011] A light sensing part, which collects external environment data;

[0012] A microprocessing control part, which determines the preset output power of each light source array according to the external environment data;

[0013] A driving part, connected to the microprocessing control part, receiving the preset output power, and driving the light-emitting unit with the preset output power through a driving circuit arranged in the driving part.

[0014] Among them, the driving circuit includes a reference structure and a control structure connected to each other, and the control structure includes a number of driving lines consistent with the number of light source arrays.

[0015] Among them, the driving circuit is a current-type driving circuit.

[0016] Among them, the reference structure includes a first transistor and a reference resistor, and each driving line includes a second transistor and a control sampling resistor. Among them, the emitter of the first transistor is connected to the reference resistor, the base of the second transistor is connected to the base and collector of the first transistor, the emitter of the second transistor is connected to the control sampling resistor, and the collector of the second transistor is connected to the corresponding light source array.

[0017] Among them, the driving circuit is a voltage-type driving circuit.

[0018] Among them, the reference structure includes an operational amplifier and a current-limiting resistor. Each of the driving lines includes a voltage follower and a control sampling resistor. Among them, the operational amplifier is connected to the current-limiting resistor. The first end of the voltage follower is connected to the current-limiting resistor, the second end is connected to the control sampling resistor, and the third end is connected to the corresponding light source array.

[0019] Among them, the at least two light source arrays are arranged side by side in an anti-distortion manner.

[0020] Among them, the at least two light source arrays are arranged side by side in a uniform manner.

[0021] According to a second aspect of the present application, there is provided a TOF module, characterized in that it includes the VCSEL light source module as described in the first aspect.

[0022] According to the VCSEL light source module and the TOF module provided by the present application, on the one hand, by setting the arrangement manner of multiple light source arrays in the VCSEL light source module, such as using an anti-distortion array arrangement or a uniform arrangement, after being projected by the TX module, a uniform density spot field is formed, the overall projected spot is evenly distributed, the spot density is consistent, effectively improving the phenomenon of reduced number of effective point clouds at the edge and decreased ranging accuracy caused by distortion due to the increase in the emission angle; on the other hand, the control component can independently control the power of each light source array in the VCSEL light source module. Compared with the conventional method of uniformly adjusting the entire array in the VCSEL light source module, the controllable range is wider, the control accuracy is higher, and a better adjustment effect can be achieved; at the same time, since the power of each light source array can be accurately controlled by configuring the current flowing through the controllable resistor in the control component, thereby achieving the effect that the brightness at the edge of the VCSEL light source array is stronger than the brightness at the center. After matching with the lens RI, the purpose of brightening the edge at the receiving end can be achieved, effectively increasing the number of effective point clouds at the edge of the object to be measured in the TOF system; in addition, through the current control of each VCSEL light source array, on the premise of meeting the overall ranging light intensity requirement, the power consumption loss in the central area is effectively reduced, thereby reducing the power consumption of the entire system. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exceeding the scope required to be protected by the present application.

[0024] Figure 1 It is a schematic diagram of the distortion of the spot after projection.

[0025] Figure 2is the RI characteristic curve of the lens in the prior art.

[0026] Figure 3 is a schematic diagram showing the anti-distortion array arrangement of the light source array of the VCSEL light source module according to an embodiment of the present application.

[0027] Figure 4 is a schematic diagram of the structure of the control component according to an embodiment of the present application.

[0028] Figure 5 is a schematic diagram of the structure of the current-mode drive circuit according to an embodiment of the present application.

[0029] Figure 6 is a schematic diagram of the structure of the voltage-mode drive circuit according to an embodiment of the present application.

[0030] Figure 7 is a schematic diagram showing a uniform distribution of the spot after projection.

[0031] Figure 8 is a schematic diagram showing the uniform arrangement of the light source array of the VCSEL light source module according to an embodiment of the present application.

[0032] Figure 9 is a schematic diagram showing the uniform arrangement of the light source array of the VCSEL light source module according to another embodiment of the present application.

[0033] Figure 10 is the distribution curve of the optical power of different partitions of the VCSEL light source module according to an embodiment of the present application.

[0034] Figure 11 is the curve of the optical field distribution at the RX end according to another embodiment of the present application.

[0035] Figure 12 is the curve of the optical field distribution at the RX end according to another embodiment of the present application.

[0036] Figure 13 is the spot projection diagram according to an embodiment of the present application.

[0037] Figure 14 is a schematic diagram of the TOF module including the VCSEL light source module provided by the present application according to an embodiment of the present application. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0039] According to one aspect of the present application, a VCSEL light source module is provided. The module includes a plurality of light source arrays and a control component. Among them, the plurality of light source arrays are arranged side by side in a preset manner. Each light source array includes a plurality of light-emitting units, and the light-emitting units are arranged at intervals and connected in series; the control component is electrically connected to the plurality of light source arrays respectively, and independently controls the plurality of light-emitting units according to the external environment to control the output power of the light-emitting units.

[0040] According to one embodiment, the arrangement manner of the above-mentioned plurality of light source arrays may include an anti-distortion array arrangement manner, such as Figure 3 shown.

[0041] In Figure 3 , the VCSEL light source module includes a plurality of light source arrays 106. Each light source array forms a separate light-emitting subset. Each light source array is composed of at least one light-emitting unit 101, and the light-emitting units are arranged at intervals. In Figure 3 In the shown embodiment, the light source arrays are arranged at intervals from the inside to the outside and can be independently controlled by the control component. The control component is electrically connected to the plurality of light source arrays respectively. For example, the electrical conduction control between the light source array and the driving part of the control component is carried out through the chip trace 105 and the Wire-Bond (W / B) PAD 104.

[0042] In Figure 3 In the shown embodiment, each light-emitting unit and each light source array are arranged at uneven intervals, and the arrangement rule follows the anti-distortion arrangement, and the position of the anti-distortion array arrangement is affected by the distortion coefficient of the optical diffraction of the emission-end lens.

[0043] In Figure 3 , each light source array is composed of several VCSEL light-emitting units 101 distributed in a certain pattern. Each light-emitting unit is serially connected through the surface trace 102. According to one embodiment, the VCSEL light-emitting unit 101 can be a near-infrared light source or one of common spectral light-emitting units such as visible light. Each single light-emitting unit is directly controlled in series, that is, the light-emitting units of the same light source array can be lit or extinguished simultaneously.

[0044] The light source arrays are connected in a common-drive parallel manner, that is, the cathodes or anodes of each light source array are directly connected. Here, the common anode is taken as an example. The principle of the common cathode is similar and is also within the protection scope of the present invention, so it will not be elaborated here. The anodes (positive electrodes) between each light source array are interconnected and connected to the driving part of the control component and the positive power supply directly; the cathodes between each light source array are separately led out and not interconnected with each other, and can be interconnected with the control ports of the driving part by using, for example, W / B PADs to achieve individual control; in order to reduce line loss and ensure that the power of each light-emitting unit is consistent, a pair of symmetrically distributed W / B PADs are designed for each light source array for symmetric power supply.

[0045] In this application, the control component can realize the adaptive control of the light intensity of the light source arrays in the VCSEL light source module. Figure 4 It is a schematic structural diagram of a control component according to an embodiment of the present application. As Figure 4 shown, the control component includes: a light sensing part, a microprocessing control part, and a driving part. Among them, the light sensing part is used to collect external environment data, and the microprocessing control part is used to determine the preset output power of each light source array according to the collected external environment data; the driving part is connected to the microprocessing control part, receives the determined preset output power, and drives the light-emitting units of the corresponding light source array at the preset output power through the driving circuit in the driving part.

[0046] According to an embodiment, the light sensing part can be a device for sensing light intensity, such as a light intensity detection device. The microprocessing control part can be a MUC (Micro Controller Unit). After processing the light intensity information according to the external environment data, the microprocessing control part determines the current application scenario of the VCSEL light source module and outputs a preset power value to be controlled to the driving part, and uses the driving circuit in the driving part to realize the control of the light intensity of the VCSEL light source module.

[0047] According to some embodiments, after receiving the external environment data and determining the preset output power of each light source array, the microprocessing control part will send the preset output power to the driving part. While the driving part realizes the control of the light intensity of the VCSEL light source module to the preset output power through the driving circuit, it will detect the current corresponding to each light source array and feedback the current to the microprocessing control part. The processing control part synthesizes the external environment data and the feedback current, determines the preset output power of each light source array, and sends the preset output power to the driving part. In this way, it loops continuously to realize a closed-loop control scheme for the light source arrays.

[0048] The solution of this application can control each light source array in the VCSEL light source module separately. To achieve this goal, the driving circuit in the driving part can control each light source array separately. As described above, the specific implementation method can include: the anodes (positive electrodes) between each light source array are connected to each other and are connected to the driving part of the control component, and the positive electrode of the driving power supply is directly connected; the cathodes between each light source array are separately led out, not interconnected with each other, and can be interconnected with the control port of the driving circuit of the driving part by using, for example, W / B PAD to achieve separate control.

[0049] For the structure of the driving circuit of the driving part, it can include a reference structure and a control structure. Among them, the reference structure is connected to the external device power supply VCC to form a reference current, providing a reference for the operation of the driving current; the control structure includes multiple driving lines, and the number of driving lines is equal to the number of light source arrays to be controlled. The driving lines are connected to the corresponding light source arrays to control the power of the light source arrays.

[0050] According to one embodiment, the driving circuit includes a current-mode driving circuit, as Figure 5 shown. The reference structure of the current-mode driving circuit includes transistor Q1 and reference resistor R2A, which can be interconnected through copper or other conductive media and are connected to the external device power supply VCC. The device power supply VCC is connected to the collector of transistor Q1, the emitter of transistor Q1 is connected to reference resistor R2A, and the device power supply VCC (via resistor R1A) flows through transistor Q1 and reference resistor R2A to form a reference current, providing a reference for the operation of the driving circuit. In Figure 5 it, the control structure of the current-mode driving circuit includes 3 driving lines. Those skilled in the art can understand that the number of driving lines is consistent with the number of light source arrays to be controlled, and the number of driving lines can be increased or decreased according to actual needs. Each driving line includes a transistor and a control sampling resistor. Each transistor represents a control port, as Figure 5 shown. The first driving line includes transistor Q2 and control sampling resistor R3A, the second driving line includes transistor Q3 and control sampling resistor R4A, and the third driving line includes transistor Q3 and control sampling resistor R5A. Among them, the connection method between the transistor and the control sampling resistor includes copper or other conductive media.

[0051] For any driving line, the base of its transistor is connected to the base and collector of the transistor of the reference structure, the emitter is connected to the control sampling resistor, and the collector is connected to one pole (such as the cathode of the light source array) of the corresponding VCSEL light source array. For example, it can be connected through W / B PAD (as Figure 5The TX1, TX2, and TX3 shown are connected to the corresponding light source arrays. The other pole of the light source array is connected to the driving power supply VDD. The driving power supply VDD forms a driving current through the transistor and the control sampling resistor in sequence, thereby driving the light source array to emit light.

[0052] As Figure 5 shown, different light source arrays are connected in parallel and are independently controlled in a single loop through the corresponding control sampling resistors. For a single loop, it consists of a single transistor, a control sampling resistor, and the light source array to be controlled. Among them, the control sampling resistor is used to collect the loop current, and the magnitude of the loop current is controlled by controlling the resistance value of the control sampling resistor. According to one embodiment, the resistance value of the control sampling resistor can be a multiple of the reference resistor, and this multiple is automatically controlled by the microprocessing control unit according to external environmental data (such as external light intensity). In this way, the base current is set by using the reference resistor R2A, and then the resistance value of the control sampling resistor is adjusted based on the transistor characteristics to achieve a constant current output for a single loop. Negative feedback control is performed by collecting the current at both ends of the control sampling resistor, so as to achieve the purpose of precise current control.

[0053] According to another embodiment, the driving circuit includes a voltage-type driving circuit, as Figure 6 shown. The reference structure of the voltage-type driving circuit includes an operational amplifier U1A and a current-limiting resistor R1A, which can be interconnected through copper or other conductive media and are connected to the power supply V1. The power supply V1 is connected to the operational amplifier U1A, the operational amplifier U1A is connected to the current-limiting resistor R1A, and the power supply V1 flows through the operational amplifier U1A and the current-limiting resistor R1A to form a reference current, providing a reference for the operation of the driving circuit. In Figure 6 it, the control structure of the voltage-type driving circuit includes 3 driving lines. Those skilled in the art can understand that the number of driving lines is the same as the number of light source arrays to be controlled, and the number of driving lines can be increased or decreased according to actual needs. Each driving line includes a voltage follower and a control sampling resistor. Each voltage follower represents a control port, as Figure 6 shown, the first driving line includes a first voltage follower and a control sampling resistor R2A, the second driving line includes a second voltage follower and a control sampling resistor R3A, and the third driving line includes a third voltage follower and a control sampling resistor R4A. Among them, the connection method between the voltage follower and the control sampling resistor includes copper or other conductive media.

[0054] In Figure 6In this case, for any one of the driving circuits, the first end of its voltage follower is connected to the current-limiting resistor R1A of the reference structure, the second end is connected to the control sampling resistor, and the third end is connected to one pole (such as the cathode of the light source array) of the corresponding VCSEL light source array. The other pole of the light source array is connected to the driving power supply VDD. The driving power supply VDD forms a driving current through the voltage follower and the control sampling resistor in sequence, thereby driving the light source array to emit light. Specifically, by applying different control voltages to the reference structure through the microprocessing control unit, this voltage is simultaneously connected to the front end of the control sampling resistor of the driving circuit and flows back to the ground through the resistor, forming a driving current. Therefore, the brightness of the light source array can be controlled by controlling the magnitude of the driving voltage and the control sampling resistor.

[0055] According to Figure 5 and Figure 6 In the illustrated embodiment, according to the characteristics of the VCSEL light source array, each light source array can be controlled separately. For example, the anodes between each light source array are directly connected, and the cathodes are interconnected with the control ports of the corresponding driving circuits and are controlled by driving control signals, thereby realizing the lighting of the VCSEL emitting light sources. In addition, the driving circuit can achieve single-channel current control.

[0056] Figure 5 and Figure 6 give the specific structure of the driving circuit. Those skilled in the art can understand that Figure 5 and Figure 6 are only examples. Inspired by Figure 5 and Figure 6 the structures of other driving circuits that can achieve separate control of the light source array also fall within the scope covered by this application.

[0057] Figure 3 The light source array arranged according to the anti-distortion array proposed in Figure 7 has the characteristic that the arrangement density of the light source array is uneven. Further, the light source array is arranged in a barrel shape, where the number of light holes in the middle part is relatively sparse and the number of light holes at the edge is dense, corresponding to the common pillow-shaped distortion problem of existing speckle projection cameras. Ideally, after being projected by the TX module, this array can form a light spot field with a uniform density, and the overall projected light spots are evenly distributed, and the light spot density is consistent as

[0058] shown.

[0059] According to one embodiment, in the present application, different currents can be applied to the inner and outer ring light source arrays through a driving circuit to increase the light power of the outer ring array, thereby improving the brightness compensation RI of the RX (receiving) edge points.

[0060] In the present application, in addition to arranging the light source arrays of the VCSEL light source module in an anti-distortion array, the light source arrays can also be arranged uniformly. Figure 8 It is a schematic diagram of the uniform arrangement of the light source arrays of the VCSEL light source module according to one embodiment of the present application. Figure 9 It is a schematic diagram of the uniform arrangement of the light source arrays of the VCSEL light source module according to another embodiment of the present application.

[0061] In Figure 8 the light source arrays of the VCSEL light source module are arranged in a ring shape uniformly, and in Figure 9 the light source arrays of the VCSEL light source module are arranged in a rectangle uniformly. Figure 8 And Figure 9 the connection manners between the multiple light source arrays and the control component in the light source modules in Figure 3 are basically the same as the scheme shown in Figure 3 and will not be elaborated here. Different from Figure 8 and Figure 9 in

[0062] each light source array and each light emitting unit are arranged at uniform intervals, and are arranged in a ring array from the inside to the outside or in a rectangular array from the inside to the outside.

[0062] Those skilled in the art can understand that Figure 8 and Figure 9 the specific uniform arrangement manners given are only used as examples, and other uniform arrangement manners also fall within the scope covered by the present application.

[0063] According to Figure 8 and Figure 9 the embodiments shown, since the light source arrays are arranged at intervals in sequence from the inside to the outside, according to one embodiment, different currents can be applied to the corresponding partitions of each light source array in accordance with the characteristics of the driving circuit to achieve the purpose of controlling the brightness of the light emitting units in different partitions. In this way, the central light intensity of the VCSEL light source array is less than the edge light intensity. Combining with the RI characteristics of the lens, the brightness of the edge and the center of the light spot finally projected by the VCSEL light source array is the same after being received by the lens, and the effective point cloud quantity can be effectively increased.

[0064] In addition, the control currents of each VCSEL light source array do not increase in equal proportion, but are determined by the product function of RI and the cosine of the emission angle. Through experiments, the distribution curve of the emission power of the light emitting units is as Figure 10 shown.

[0065] When considering which arrangement of the light source array to adopt, the lens RI needs to be considered. For example, Figure 8 The circular uniform arrangement is more suitable for the case where the lens RI is circularly distributed, and can well achieve the circular corresponding effect with the RI. For example, in the case where the lens RI is circularly distributed, according to Figure 3 The anti-distortion arrangement of the light-emitting units shown is the position of the light-emitting units optimized according to the square receiving chip, and cannot well achieve the circular corresponding effect with the RI. For the lens RI compensation, it is not the optimal effect. The anti-distortion arrangement of the receiving end speckle brightness simulation is as shown in Figure 11 Shown. In contrast, Figure 8 The circular uniform arrangement of the light source array shown has the total output light power of each light source array gradually increasing from the inside to the outside correspondingly, and corresponding to the lens RI characteristics, and can well achieve the circular corresponding effect with the RI, so as to achieve the purpose of the receiving end spot consistency. The receiving end speckle brightness simulation effect is better, as shown in Figure 12 Shown, and the spot projection effect is also very good, as shown in Figure 13 Shown.

[0066] Figure 14 is a schematic diagram of a TOF module including the VCSEL light source module provided by the present application according to an embodiment of the present application. As shown in Figure 14 Shown, 201 is the receiving end optical lens, which receives the modulated light emitted by the light source and transmits it to the CMOS sensor 204. 202 is the transmitting end lens, which is used to project the laser emitted by the VCSEL chip 205 (corresponding to the light source array of the above VCSEL light source module) designed by the present invention into a spot with a certain angle and size. 203 is an optical color filter, which is used to filter other light except the light source band, so as to reduce the interference of ambient light on the ranging system. 206 and 207 are the PCB carrier board and the VCSEL carrier board, which are respectively used to carry out the electrical conduction of the TOF Sensor and the VCSEL chip and make signal connections. Among them, a VCSEL light source driving device (corresponding to the control component of the above VCSEL light source module) shown in 208 is also installed on 206, which is used to drive the lighting of the light source array.

[0067] According to an embodiment, the TOF receiving system can control when the light source array of the VCSEL light source module is turned on or at what frequency it is turned on or off through, for example, a modulation signal, and the control component of the VCSEL light source module individually controls the power of each light source array, thereby controlling the brightness of each light source array to emit light.

[0068] It should be noted that the VCSEL light source module proposed in the present application is not only applicable to the TOF module, but also applicable to other systems or modules, such as systems or modules of 3D vision solutions that require the use of VCSELs such as structured light.

[0069] According to the VCSEL light source module and the TOF module provided by the present application, on the one hand, by setting the arrangement mode of multiple light source arrays in the VCSEL light source module, for example, adopting an anti-distortion array arrangement or a uniform arrangement mode, after being projected by the TX module, a uniform density light spot field is formed, the overall projected light spot is evenly distributed, the light spot density is consistent, effectively improving the phenomenon of reducing the number of effective point clouds at the edge caused by distortion due to the increase of the emission angle and the decrease of the ranging accuracy; on the other hand, the control component can perform independent power control on each light source array in the VCSEL light source module. Compared with the conventional method of uniformly adjusting the entire array in the VCSEL light source module, the controllable range is wider, the control accuracy is higher, and a better adjustment effect can be achieved; at the same time, since the power of each light source array can be accurately controlled by configuring the current flowing through the controllable resistor in the control component, thereby achieving the effect that the brightness at the edge of the VCSEL light source array is stronger than the brightness at the center. After matching with the lens RI, the purpose of brightening the edge at the receiving end can be achieved, effectively increasing the number of effective point clouds at the edge of the object to be measured in the TOF system; in addition, through the current control of each VCSEL light source array, on the premise of meeting the overall ranging light intensity requirement, the power consumption loss in the central area is effectively reduced, thereby reducing the power consumption of the entire system.

[0070] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, any changes or deformations made by those skilled in the art based on the idea of the present application, within the specific implementation manner and application scope of the present application, all belong to the protection scope of the present application. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A VCSEL light source module, characterized in that, Comprising: At least two light source arrays, the at least two light source arrays being arranged side by side, each of the light source arrays including at least two light emitting units, the light emitting units being arranged at intervals and connected in series; A control component, electrically connected to each of the light source arrays, and controlling the output power of the light emitting units according to the external environment.

2. The VCSEL light source module according to claim 1, characterized in that, The control component includes: A light sensing part for collecting external environment data; A microprocessing control part for determining the preset output power of each of the light source arrays according to the external environment data; A driving part, connected to the microprocessing control part, receiving the preset output power, and driving the light emitting units at the preset output power through a driving circuit provided in the driving part.

3. The VCSEL light source module according to claim 2, characterized in that, The driving circuit includes a reference structure and a control structure connected to each other, and the control structure includes driving lines with a number consistent with the number of the light source arrays.

4. The VCSEL light source module according to claim 3, characterized in that, The driving circuit is a current-type driving circuit.

5. The VCSEL light source module according to claim 4, characterized in that, The reference structure includes a first transistor and a reference resistor, and each driving line includes a second transistor and a control sampling resistor. Among them, the emitter of the first transistor is connected to the reference resistor, the base of the second transistor is connected to the base and the collector of the first transistor, the emitter of the second transistor is connected to the control sampling resistor, and the collector of the second transistor is connected to the corresponding light source array.

6. The VCSEL light source module according to claim 3, characterized in that, The driving circuit is a voltage-type driving circuit.

7. The VCSEL light source module according to claim 4, characterized in that, The reference structure includes an operational amplifier and a current limiting resistor, and each driving line includes a voltage follower and a control sampling resistor. Among them, the operational amplifier is connected to the current limiting resistor, the first end of the voltage follower is connected to the current limiting resistor, the second end is connected to the control sampling resistor, and the third end is connected to the corresponding light source array.

8. The VCSEL light source module according to claim 1, characterized in that, The at least two light source arrays are arranged side by side in an anti-distortion manner.

9. The VCSEL light source module according to claim 1, characterized in that, The at least two light source arrays are arranged side by side in a uniform manner.

10. A TOF module, characterized in that, Including the VCSEL light source module according to any one of claims 1-9.

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