CN109917807B - Control system and control method of time-of-flight assembly and terminal - Google Patents
Control system and control method of time-of-flight assembly and terminal Download PDFInfo
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- CN109917807B CN109917807B CN201910228726.3A CN201910228726A CN109917807B CN 109917807 B CN109917807 B CN 109917807B CN 201910228726 A CN201910228726 A CN 201910228726A CN 109917807 B CN109917807 B CN 109917807B
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Abstract
The application discloses a control system for a time of flight assembly. The time-of-flight assembly includes a laser light source. The control system comprises a driving circuit and a detection circuit. The driving circuit is connected with the laser light source and is used for driving the laser light source to emit laser according to a modulation mode. The detection circuit is connected with the laser light source and used for detecting the modulation mode, and when the time length of the modulation mode representing that the laser light source is in the effective working state is greater than a preset time length threshold value in a first time length or the luminous energy of the modulation mode representing that the laser light source is greater than a preset energy threshold value in a second time length, the detection circuit sends a closing control signal to close the laser light source. The application also discloses a control method of the terminal and the flight time assembly.
Description
Technical Field
The present application relates to the field of consumer electronics technologies, and in particular, to a control system and a control method for a time-of-flight component, and a terminal.
Background
The mobile phone can be provided with a depth acquisition device, the depth acquisition device can acquire the depth of a target object by using a Time of flight (TOF) technology, the specific mode is that a light source is controlled to emit laser to the target object, the laser reflected by the target object is received, the depth of the target object is acquired by calculating the Time difference of the laser between the mobile phone and the target object, when the depth acquisition device works abnormally, the laser can continuously emit the laser outwards, the continuously emitted laser easily damages a user, and the use safety of the depth acquisition device is low.
Disclosure of Invention
The embodiment of the application provides a control system and a control method of a time-of-flight assembly and a terminal.
The control system of the embodiment of the application is used for controlling the time-of-flight assembly, the time-of-flight assembly comprises a laser light source, and the control system comprises a driving circuit and a detection circuit; the driving circuit is connected with the laser light source and is used for driving the laser light source to emit laser according to a modulation mode; the detection circuit is connected with the laser light source and used for detecting the modulation mode, and when the modulation mode represents that the time length of the laser light source in an effective working state is greater than a preset time length threshold value in a first time length or the modulation mode represents that the luminous energy of the laser light source is greater than a preset energy threshold value in a second time length, the detection circuit sends a closing control signal to close the laser light source.
In some embodiments, the detection circuit is connected to the driving circuit, and the driving circuit turns off the laser light source when receiving the turn-off control signal.
In some embodiments, the control system further comprises an application processor coupled to the drive circuit and the detection circuit;
and when the application processor receives the closing control signal, the application processor controls the driving circuit to close the laser light source.
In some embodiments, the time of flight assembly further comprises a sensor for receiving laser light reflected by a target object, the control system further comprising an application processor and a modulation module; the application processor is connected with the detection circuit and the sensor; the modulation module is integrated on the sensor, and the modulation mode is stored in the modulation module; the driving circuit is connected with the sensor to receive the modulation mode, when the application processor receives the closing control signal, the application processor sends the closing control signal to the sensor, and the sensor controls the driving circuit to close the laser light source according to the closing control signal.
In some embodiments, the control system further includes a power module, the power module is connected to the laser light source and configured to supply power to the laser light source, the power module is further connected to the detection circuit, and the power module disconnects power supply to the laser light source when receiving the shutdown control signal.
In certain embodiments, the control system further comprises an application processor and a signal generator; the application processor is connected with the detection circuit; the signal generator is connected with the application processor; and when the application processor receives the closing control signal, the signal generator sends out prompt information of the abnormity of the flight time assembly.
In some embodiments, when the signal generator receives a predetermined operation, the detection circuit stops sending the turn-off control signal and the laser light source is turned on again; or
After the detection circuit sends the closing control signal for a preset time, the detection circuit stops sending the closing control signal, and the laser light source is started again.
In some embodiments, the detection circuit continues to send the turn-off control signal when the number of times the laser light source is continuously turned off exceeds a predetermined number of times.
The terminal of the embodiment of the application comprises a time-of-flight component and the control system of any one of the above embodiments, wherein the control system is connected with the time-of-flight component.
The control method of the embodiment of the application is used for controlling the time-of-flight assembly, the time-of-flight assembly comprises a laser light source, and the control method comprises the steps of driving the laser light source to emit laser according to a modulation mode; detecting whether the modulation mode represents that whether the duration of the laser light source in the effective working state is greater than a preset duration threshold value within a first duration, or whether the modulation mode represents that the luminous energy of the laser light source is greater than a preset energy threshold value within a second duration; and if so, sending a closing control signal to close the laser light source.
In the control system, the control method and the terminal of the time-of-flight component in the embodiments of the application, by detecting the modulation mode, and in the first duration, when the duration that the modulation mode represents that the laser light source is in the effective working state is greater than the preset duration threshold, or in the second duration, when the modulation mode represents that the luminous energy of the laser light source is greater than the preset energy threshold, it is determined that the time-of-flight component is abnormal, for example, the laser light source continuously emits laser light for too long, and at this time, the laser light source is turned off, so that a user can be prevented from being injured, and the use safety of the time-of-flight component is high.
Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a terminal according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a time-of-flight assembly and control system according to an embodiment of the present application;
fig. 3 and 4 are schematic waveforms of modulation schemes detected by the detection circuit according to the embodiment of the present application;
FIG. 5 is a block schematic diagram of a control system of an embodiment of the present application;
fig. 6 is a schematic diagram of a structure and signal orientation of a driving circuit according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a structure and signal orientation of a detection circuit according to an embodiment of the present disclosure;
FIGS. 8-11 are block schematic diagrams of a control system according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 13 is a flowchart illustrating a control method of a time-of-flight component according to an embodiment of the present application.
Description of the main element symbols:
Detailed Description
Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.
In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 and 2, a terminal 100 according to an embodiment of the present invention includes a time-of-flight component 10 and a control system 20. The terminal 100 may control the time-of-flight component 10 to acquire depth information of the target object using the control system 20 to perform ranging, modeling, and the like using the depth information. The terminal 100 may specifically be a mobile phone, a tablet computer, a remote controller, an intelligent wearable device, and the like, and the terminal 100 may also be an external device installed on a mobile platform (e.g., an unmanned aerial vehicle, an automobile, and the like). In the embodiment of the present application, the terminal 100 is taken as a mobile phone as an example for description, and it is understood that the specific form of the terminal 100 is not limited to the mobile phone. In the example shown in fig. 1, the terminal 100 includes a housing 30, and the housing 30 may be used to mount the time-of-flight assembly 10 and the control system 20.
Referring to FIG. 1, the time of flight assembly 10 can be mounted within a housing 30, and specifically, in one example, the housing 30 has a through hole formed therein, the time of flight assembly 10 is mounted within the housing 30 and aligned with the through hole, and the through hole can be formed in a front surface (as shown in FIG. 1 a) or a back surface (as shown in FIG. 1 b) of the housing 30; in another example, the time of flight assembly 10 is mounted within the housing 30 and aligned with the display screen 40, i.e., disposed below the display screen 40, with the optical signals emitted by the time of flight assembly 10 passing through the display screen 40 into the environment, or with the optical signals from the environment passing through the display screen 40 for receipt by the time of flight assembly 10.
Referring to fig. 2, the time-of-flight component 10 includes an optical transmitter 11 and an optical receiver 12. The optical transmitter 11 and the optical receiver 12 may be disposed on the same substrate 13. The light emitter 11 includes a Laser light source 111 and a diffuser 112, the Laser light source 111 may be a Vertical Cavity Surface Emitting Laser (VCSEL), the Laser light source 111 may be configured to emit infrared Laser, a wavelength of the infrared Laser may be 940 nm, and the infrared Laser may have a uniform spot pattern. A diffuser (diffuser)112 is disposed on an optical path of the infrared laser light, and the infrared laser light emitted from the laser light source 111 is diffused by the diffuser 112 to be emitted more uniformly into an external space. At the same time, the diffuser 112 may also reflect a portion of the infrared laser light.
Referring to fig. 2, in the embodiment of the present application, when the time-of-flight assembly 10 works normally, the infrared laser emitted from the laser source 111 is a laser pulse (as indicated by the signal T1 shown in fig. 3 and 4), that is, the laser source 111 emits a laser pulse at a high level, and the laser source 111 does not emit a laser pulse at a low level, so as to prevent the user from being injured due to continuous emission of laser to the outside.
The light receiver 12 includes a lens 121 and a sensor 122. The infrared laser beam is emitted from the light emitter 11 and reaches the target object, and the infrared laser beam returns to the light receiver 12 and is received by the light receiver 12 under the reflection action of the target object. Specifically, the reflected infrared laser light passes through the lens 121 and is received by the sensor 122. By calculating the time difference between the emission of the infrared laser light by the laser light source 111 and the receipt of the reflected infrared laser light by the sensor 122, the depth (i.e., distance) of the target object relative to the time-of-flight assembly 10 can be calculated.
Referring to fig. 2 and 5, a control system 20 may be connected to the time-of-flight element 10, and the control system 20 may be configured to control the time-of-flight element 10 to emit and receive infrared laser light. The control system 20 includes a drive circuit 23 and a detection circuit 22.
The driving circuit 23 is connected to the laser source 111, and the driving circuit 23 is configured to drive the laser source 111 to emit laser light according to a modulation method. The modulation mode may be represented by a modulation signal, and when the time-of-flight assembly 10 normally operates, the modulation mode is a modulation mode corresponding to a pulse wave, that is, the modulation signal is a pulse signal (e.g., a T2 signal shown in fig. 3 and 4), and the modulation mode includes a section indicating that the laser light source 111 is in an effective operating state (i.e., the laser light source 111 is emitting laser light), and also includes a section indicating that the laser light source 111 is not in an effective operating state (i.e., the laser light source 111 is not emitting laser light).
Referring to fig. 6, the driving circuit 23 may obtain power from an external power source through a chip power supply pin, communicate with an external module through a communication interface (e.g., SDIO pin, SCLK pin), connect with a laser light source power source through a laser light source power supply pin, and connect with the laser light source 111 through a laser light source 111 control signal pin. The driving circuit 23 may be disposed on the substrate 13.
Referring to fig. 5 to 7, the detection circuit 22 is connected to the laser source 111, and the detection circuit 22 is used for detecting the modulation mode. The detection circuit 22 may be packaged as a detection chip or integrated in the remaining functional modules of the terminal 100. Specifically, the modulation scheme detected by the detection circuit 22 is the modulation scheme adopted by the laser light source 111, and the laser light source 111 emits laser light according to the modulation scheme, so that the light emitting state of the laser light source 111 can be detected by detecting the modulation scheme. And when detecting that the laser light source 111 does not work normally, sending a closing control signal to close the laser light source 111.
Specifically, referring to fig. 3, in an example, in the first time period a, when the time length during which the modulation mode indicates that the laser light source 111 is in the effective working state is greater than the preset time length threshold, the detection circuit 22 determines that the time-of-flight assembly 10 is not working normally, and sends a turn-off control signal to turn off the laser light source 111. The first time length and the time length threshold may be any time length set by the terminal 100 according to user information or environmental factors, or may be personalized set by the user according to security requirements, for example, the first time length may be 10 milliseconds, the time length threshold may be 8 milliseconds, or the first time length may be 100 nanoseconds, the time length threshold may be 56 nanoseconds, and the like. The detection circuit 22 may detect the modulation mode within the first time period a, and after it is detected that the laser light source 111 is in the effective working state (i.e., emits light) within the first time period a and exceeds the time period threshold, it may be considered that within the first time period a, the light emitting time period of the laser light source 111 is too long, and the infrared laser emits too much energy to the user, which may cause damage to the user, especially damage to eyes of the user.
Referring to fig. 4, in another example, in the second time period b, when the light emitting energy of the modulation mode characterization laser light source 111 is greater than the preset energy threshold, the detection circuit 22 determines that the time-of-flight component 10 is not working normally, and sends a turn-off control signal to turn off the laser light source 111. The second duration and the energy threshold may be any duration set by the terminal 100 according to the user information or the environmental factors, or may be set individually by the user according to the security requirement. The detection circuit 22 may detect the modulation mode in the second time period b, and when it is detected that the light emitting energy of the laser light source 111 exceeds the energy threshold in the second time period b, it may be considered that excessive energy is emitted by the infrared laser to the user in the second time period b, which may cause injury to the user, especially, the eyes of the user.
It can be understood that both the first duration and the second duration may be set by the terminal 100 when it leaves the factory, or the user may adjust specific values of the first duration and the second duration according to the setting.
In summary, in the terminal 100 of the embodiment of the present application, the detection circuit 22 determines that the time period during which the modulation mode represents that the laser light source 111 is in the effective working state is greater than the preset time period threshold value in the first time period, or determines that the time-of-flight component 10 works abnormally when the modulation mode represents that the light-emitting energy of the laser light source 111 is greater than the preset energy threshold value in the second time period, for example, the time during which the laser light source 111 continuously emits laser light is too long, and at this time, the laser light source 111 is turned off, so that the user may be prevented from being injured, and the safety of the time-of-flight component 10 is high. Meanwhile, the control system 20 of the present application detects whether the time-of-flight component 10 is abnormal through a hardware scheme, that is, through the detection circuit 22, and compared with the detection through a software scheme, the situation of detection failure caused by software crash and the like is avoided, and the reliability is higher.
Referring to fig. 3, in some embodiments, in the first time period, when the continuous time period of the modulation mode indicating that the laser light source 111 is in the effective working state is greater than the preset time period threshold, the detection circuit 22 sends a turn-off control signal to turn off the laser light source 111. Specifically, as shown in fig. 3, in the modulation mode T2 within a first time length a, the continuous time lengths characterizing that the laser source 111 is in the active working state are T1 and T2, respectively, then whether T1 is greater than the time length threshold value and whether T2 is greater than the time length threshold value are compared, and when at least one of T1 and T2 is greater than the time length threshold value, the detection circuit 22 sends out the turn-off control signal. In the modulation mode T3 within a time length a, the continuous time length representing that the laser light source 111 is in the effective working state is T3, then whether T3 is greater than the time length threshold value is compared, and when T3 is greater than the time length threshold value, the detection circuit 22 sends out a closing control signal.
Referring to fig. 3, in some embodiments, in the first time period, when the total time period during which the modulation mode indicates that the laser light source 111 is in the effective working state is greater than the preset time period threshold, the detection circuit 22 sends a turn-off control signal to turn off the laser light source 111. Specifically, as shown in fig. 3, in the modulation mode T2 within a first time length a, the total time length representing that the laser light source 111 is in the effective working state is T1+ T2, and then whether T1+ T2 is greater than the time length threshold is compared, and when T1+ T2 is greater than the time length threshold, the detection circuit 22 sends out the turn-off control signal. In the modulation mode T3 within a time length a, the total time length representing that the laser light source 111 is in the effective working state is T3, then whether T3 is greater than the time length threshold value is compared, and when T3 is greater than the time length threshold value, the detection circuit 22 sends out a closing control signal.
Referring to fig. 4, in some embodiments, when the integral of the amplitude of the modulation mode in the second time period is greater than the predetermined integral threshold, the modulation mode indicates that the light emitting energy of the laser source 111 is greater than the predetermined energy threshold. Specifically, the integral of the amplitudes of the modulation schemes in the second period may be represented by areas, as shown in fig. 4, the integral of the amplitudes of the modulation schemes T2 in one second period b in the second period b may be represented by an area S1 of a shaded portion, and then whether S1 is greater than the integration threshold is compared, and when S1 is greater than the integration threshold, the detection circuit 22 issues a turn-off control signal. The integral of the amplitude of the modulation pattern T3 in the second period b can be represented by the shaded area S2, and then the comparison S2 is compared to see if it is larger than the integral threshold, and when S2 is larger than the integral threshold, the detection circuit 22 issues the turn-off control signal. The integral of the amplitude of the modulation pattern T4 in the second period b can be represented by the shaded area S3, and then the comparison S3 is compared to see if it is larger than the integral threshold, and when S3 is larger than the integral threshold, the detection circuit 22 issues the turn-off control signal. It will be appreciated that the integration greater than the integration threshold may be caused by the overall greater amplitude during the second time period b, or the greater duration of the emission of the laser source 111, or both the greater amplitude and the greater duration of the emission of the laser source 111. Specifically, when the second time period b is set to be small enough, for example, infinitely close to 0, and the integral value of the amplitude of the modulation mode in the second time period b is the amplitude, the amplitude is compared with the magnitude relation of the integral threshold, and when the amplitude is greater than the integral threshold, the modulation mode indicates that the light emission energy of the laser light source 111 is greater than the energy threshold.
Referring to fig. 5 and 7, in some embodiments, the detection circuit 22 is connected to the driving circuit 23, and the driving circuit 23 turns off the laser source 111 when receiving the turn-off control signal.
The detection circuit 22 may send a control output signal to the driving circuit 23, where the control output signal may be the above-mentioned turn-off control signal, and when the driving circuit 23 receives the turn-off control signal, the driving circuit 23 turns off the laser light source 111, so that the laser light source 111 stops emitting laser light outwards. In one example, the way that the driving circuit 23 turns off the laser light source 111 may be: the driving circuit 23 drives the laser light source 111 to emit laser light in a modulation scheme of long and dark, wherein the modulation scheme of long and dark refers to a modulation scheme in which a modulation signal is continuously at a low level.
Referring to fig. 7 and 8, in some embodiments, the control system 20 further includes an Application Processor 24 (AP). The application processor 24 is connected to the detection circuit 22. The application processor 24 is connected to the drive circuit 23. When the application processor 24 receives the turn-off control signal, the application processor 24 controls the driving circuit 23 to turn off the laser light source 111.
The application processor 24 may be a system of the terminal 100, the application processor 24 is connected to the detection circuit 22, the detection circuit 22 may operate under the control of the application processor 24, and the application processor 24 may transmit a control signal such as an enable signal (AP _ EN signal) or a reset signal (AP _ Rst signal) to the detection circuit 22. Meanwhile, the detection circuit 22 may send a control output signal to the application processor 24, when the control output signal is a turn-off control signal, the application processor 24 may send a turn-off control instruction to the driving circuit 23 through a communication interface of the driving circuit 23, and after the driving circuit 23 responds to the turn-off control instruction, the laser light source 111 is turned off, so that the laser light source 111 stops emitting laser light to the outside.
Referring to fig. 9, in some embodiments, the control system 20 further includes an application processor 24 and a modulation module 25 integrated with the sensor 122. Application processor 24 is coupled to detection circuit 22 and sensor 122. The modulation module 25 stores therein a modulation scheme. The drive circuit 23 is connected to the sensor 122 to receive the modulation scheme. When the application processor 24 receives the shutdown control signal, the application processor 24 sends the shutdown control signal to the sensor 122, and the sensor 122 controls the driving circuit 23 to shut down the laser light source 111 according to the shutdown control signal.
The modulation module 25 may send the stored modulation mode to the driving circuit 23, and when the time-of-flight component 10 normally works, the driving circuit 23 drives the laser light source 111 to emit laser light according to the modulation mode, where the modulation mode may include information such as period information and power information of laser pulses emitted by the laser light source 111, and the modulation mode may include multiple modulation modes, and in different usage scenarios, the driving circuit 23 may drive the laser light source 111 to emit laser light according to different modulation modes.
When the detection circuit 22 sends out the shutdown control signal, it indicates that the laser light source 111 fails to emit laser light in a safe modulation mode, which may be a failure of the modulation module 25 or an error in the selection of the modulation mode. The connection between the detection circuit 22 and the application processor 24 may be as shown in fig. 7, and the application processor 24 sends a closing control signal to the sensor 122 when receiving the closing control signal sent by the detection circuit 22; after receiving the turn-off control signal, the sensor 122 directly controls the driving circuit 23 to turn off the laser according to the turn-off control signal, and does not control the driving circuit 23 to drive the laser light source 111 according to the original modulation method any more, so as to preferentially ensure that the laser light source 111 is turned off.
Referring to fig. 10, in some embodiments, the control system 20 further includes a power module 26, and the power module 26 is connected to the laser light source 111 and is configured to supply power to the laser light source 111. The power module 26 is also connected to the detection circuit 22, and when the power module 26 receives the shutdown control signal, the power supply to the laser light source 111 is cut off.
Referring to fig. 7, at this time, the detection circuit 22 may send a control output signal to the power module 26, and when the control output signal is a turn-off control signal, the power module 26 turns off the power supply to the laser light source 111 to turn off the laser light source 111. Specifically, when the time-of-flight assembly 10 works normally, the detection circuit 22 may send a low-level electrical signal to the power module 26, the power module 26 continues to supply power to the laser light source 111, and when the detection circuit 22 sends a high-level electrical signal (which may be regarded as a shutdown control signal) to the power module 26, the power module 26 stops supplying power to the laser light source 111 in response to the high-level electrical signal until the detection circuit 22 sends a low-level electrical signal to the power module 26 again, and the power module 26 supplies power to the laser light source 111 again.
Referring to fig. 11, in some embodiments, the control system 20 further includes an application processor 24 and a signal generator 27. The application processor 24 is connected to the detection circuit 22. The signal generator 27 is connected to the application processor 24. Upon receipt of the shutdown control signal by the application processor 24, the signal generator 27 signals an anomaly in the time of flight assembly 10.
The user can know that the time-of-flight assembly 10 is not working properly through the prompt message sent by the signal generator 27, and may injure the user, and the user can take corresponding measures in time to avoid being injured, such as turning off the terminal 100, changing the orientation of the terminal 100 to avoid being irradiated by laser, and the like. Specifically, the signal generator 27 may be a light generator, and in one example, as shown in fig. 12, the signal generator 27 may be a display 40, and the prompt message may be a prompt message displayed on the display 40, such as displaying prompt text, patterns, animation, etc.; the signal generator 27 may also be a sound generator, in one example, the signal generator 27 may be a speaker or the like, and the prompt message may be a voice prompt emitted by the speaker; the signal generator 27 may also be an actuator, in one example, the actuator may be a vibration motor or the like, and the prompt message may be that the vibration motor drives the housing 30 of the terminal 100 to vibrate at a predetermined frequency.
Referring to fig. 12, in one example, when the signal generator 27 receives a predetermined operation, the detection circuit 22 stops sending the turn-off control signal and the laser source 111 is turned on again. Taking fig. 12 as an example, the display 40 may display a prompt message of "click retry (10S)", the user may click the prompt message, the display 40 determines that a predetermined operation is received after receiving the click operation of the user, the detection circuit 22 stops sending the off control signal at this time, and the laser light source 111 is turned on again. Of course, the type of predetermined operation may be different for different types of signal generators 27 and different prompting messages, and is not limited herein.
Referring to fig. 12 again, in another example, after the detection circuit 22 sends the shutdown control signal for a predetermined time period, the detection circuit 22 stops sending the shutdown control signal, and the laser source 111 is turned on again. Specifically, the predetermined time period may be any time period such as 10 seconds, 7 seconds, 3 seconds, and the like, the terminal 100 may restart software related to the laser light source 111 within the predetermined time period or perform self-checking, and the laser light source 111 is turned on after the predetermined time period, so as to meet the use requirement of the user.
In some embodiments, the detection circuit 22 continues to send the turn-off control signal when the number of times the laser light source 111 is continuously turned off exceeds a predetermined number of times. After the laser source 111 is turned off and turned on again, the detection circuit 22 may still detect that the time-of-flight assembly 10 is not working properly, and then turn off the control signal again and turn off the laser source 111 again. When the number of times that the laser light source 111 is continuously turned off exceeds the predetermined number of times, which indicates that the time-of-flight assembly 10 may have hardware damage or a software failure that is difficult to repair, the time-of-flight assembly 10 needs to be more comprehensively detected or repaired for normal use, and therefore, in order to ensure user safety, the detection circuit 22 continuously sends a turn-off control signal at this time, so as to prevent the laser light source 111 from being turned on by mistake.
Referring to fig. 13, a control method of the time-of-flight assembly 10 according to the embodiment of the present application includes the steps of:
01: driving the laser light source 111 to emit laser light in a modulation mode;
02: detecting whether the duration of the modulation mode representing that the laser light source is in the effective working state is greater than a preset duration threshold value within a first duration, or whether the luminous energy of the modulation mode representing the laser light source is greater than a preset energy threshold value within a second duration; and
03: if yes, a turn-off control signal is sent to turn off the laser light source 111.
In the description herein, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.
Claims (10)
1. A control system for a time of flight assembly, the time of flight assembly including a laser light source, the control system comprising:
the driving circuit is connected with the laser light source and used for driving the laser light source to emit laser light according to a modulation mode, the modulation mode comprises at least one of period information and power information of laser pulses emitted by the laser light source, and the driving circuit drives the laser light source to emit laser light according to different modulation modes in different use scenes; and
the detection circuit is connected with the laser light source and used for detecting the modulation mode, and when the modulation mode represents that the time length of the laser light source in an effective working state is greater than a preset time length threshold value in a first time length or the modulation mode represents that the luminous energy of the laser light source is greater than a preset energy threshold value in a second time length, the detection circuit sends a closing control signal to close the laser light source.
2. The control system of claim 1, wherein the detection circuit is connected to the driving circuit, and the driving circuit turns off the laser light source when receiving the turn-off control signal.
3. The control system of claim 1, further comprising an application processor, the application processor coupled to the drive circuit and the detection circuit;
and when the application processor receives the closing control signal, the application processor controls the driving circuit to close the laser light source.
4. The control system of claim 1, wherein the time of flight assembly further comprises a sensor for receiving laser light reflected by a target object, the control system further comprising:
the application processor is connected with the detection circuit and the sensor; and
the modulation module is integrated on the sensor, and the modulation mode is stored in the modulation module;
the driving circuit is connected with the sensor to receive the modulation mode, when the application processor receives the closing control signal, the application processor sends the closing control signal to the sensor, and the sensor controls the driving circuit to close the laser light source according to the closing control signal.
5. The control system of claim 1, further comprising a power module connected to the laser light source for supplying power to the laser light source, the power module further connected to the detection circuit, the power module disconnecting the power supply to the laser light source when receiving the shutdown control signal.
6. The control system of claim 1, further comprising:
the application processor is connected with the detection circuit; and
a signal generator connected to the application processor;
and when the application processor receives the closing control signal, the signal generator sends out prompt information of the abnormity of the flight time assembly.
7. The control system of claim 6, wherein when the signal generator receives a predetermined operation, the detection circuit stops sending the turn-off control signal and the laser light source is turned back on; or
After the detection circuit sends the closing control signal for a preset time, the detection circuit stops sending the closing control signal, and the laser light source is started again.
8. The control system of claim 7, wherein the detection circuit continues to issue the turn-off control signal when the number of times the laser light source is continuously turned off exceeds a predetermined number of times.
9. A terminal, comprising:
a time-of-flight component; and
the control system of any one of claims 1 to 8, connected to the time of flight assembly.
10. A method of controlling a time-of-flight assembly, the time-of-flight assembly including a laser light source, the method comprising:
driving the laser light source to emit laser according to a modulation mode, wherein the modulation mode comprises at least one of period information and power information of laser pulses emitted by the laser light source, and the laser light source is driven to emit laser according to different modulation modes in different use scenes;
detecting whether the modulation mode represents that whether the duration of the laser light source in the effective working state is greater than a preset duration threshold value within a first duration, or whether the modulation mode represents that the luminous energy of the laser light source is greater than a preset energy threshold value within a second duration; and
if yes, sending a closing control signal to close the laser light source.
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