CN109904718B - 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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- CN109904718B CN109904718B CN201910229457.2A CN201910229457A CN109904718B CN 109904718 B CN109904718 B CN 109904718B CN 201910229457 A CN201910229457 A CN 201910229457A CN 109904718 B CN109904718 B CN 109904718B
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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 and a sensor. The laser light source is used for emitting laser light, and the sensor is used for receiving the reflected laser light. The control system comprises a driving chip and an application processor. The driving chip is connected with the laser light source and is used for driving the laser light source to emit laser. The application processor is connected with the sensor and the driving chip, and is used for receiving feedback information of the sensor to identify whether the sensor is abnormal or not and sending a closing control signal to control the driving chip to close the laser light source when the sensor is identified to be abnormal. The application also discloses a control method of the terminal and the flight time assembly. The application processor is connected with the sensor and the driving chip, the driving chip is directly controlled to close the laser light source when the sensor is identified to be abnormal, the laser is prevented from hurting a user, and the use safety of the flight time assembly is high.
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 depth acquisition device can acquire the depth of a target object by using a Time of Flight (TOF) technology, and particularly, the depth acquisition device controls a light source to emit laser to the target object and then receives the laser reflected by the target object, and acquires the depth of the target object by calculating a phase difference between the Time of emitting the laser and the Time of receiving the reflected laser, and when a sensor of the depth acquisition device is abnormal, the laser is abnormally emitted, so that a user is easily injured, and the use safety of the depth acquisition device is reduced.
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 time-of-flight 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 a sensor, the laser light source is used for emitting laser, and the sensor is used for receiving the laser reflected back. The control system comprises a driving chip and an application processor. The driving chip is connected with the laser light source and is used for driving the laser light source to emit the laser. The application processor is connected with the sensor and the driving chip, and is used for receiving feedback information of the sensor to identify whether the sensor is abnormal or not, and sending a closing control signal to control the driving chip to close the laser light source when the sensor is identified to be abnormal.
The terminal of the embodiment of the application comprises a time-of-flight component and the control system of any one of the embodiments, wherein the control system is connected with the time-of-flight component.
The control method of the time-of-flight assembly is used for controlling the time-of-flight assembly, the time-of-flight assembly comprises a laser light source and a sensor, the control method comprises the steps of receiving feedback information of the sensor to identify whether the sensor is abnormal or not, and turning off the laser light source when the sensor is identified to be abnormal.
In the control system, the control method and the terminal of the time-of-flight assembly in the embodiment of the application, the application processor is connected with the sensor and the driving chip, the driving chip is directly controlled to close the laser light source when the sensor is identified to be abnormal, the laser is prevented from hurting a user, and the use safety of the time-of-flight assembly 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 is a schematic diagram illustrating an application processor identifying sensor anomalies according to an embodiment of the application;
fig. 4 is a schematic diagram of a structure and a signal orientation of a driving chip according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram illustrating the structure and signal orientation of an application processor according to an embodiment of the present disclosure;
FIGS. 6-8 are block schematic diagrams of a control system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 10 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, a first feature may be "on" or "under" a second feature in direct contact with the first or second feature, or the first and second features may be in indirect contact via intermediate media. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or may simply mean 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 can have a through hole formed therein, the time of flight assembly 10 can be mounted within the housing 30 and aligned with the through hole, and the through hole can be formed in the front or back 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.
Referring to fig. 2, in the embodiment of the present application, the infrared laser emitted by the laser source 111 is a laser pulse (as indicated by the signal T1 shown in fig. 3), 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 avoid the unsafe and heating problems caused by continuous emission.
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 difference in time between the emission of the infrared laser light by laser light source 111 and the receipt of the reflected infrared laser light by sensor 122, the depth (i.e., distance) of the target object relative to time-of-flight assembly 10 can be calculated.
Referring to fig. 1, 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 driver chip 21 and an Application Processor 22 (AP). The driving chip 21 is connected to the laser light source 111, and the driving chip 21 is used for driving the laser light source 111 to emit laser light. The application processor 22 is connected to both the sensor 122 and the driver chip 21. After receiving the feedback information of the sensor 122, the application processor 22 identifies whether the sensor 122 is abnormal or not through the feedback information, and when the application processor 22 identifies that the sensor 122 is abnormal, the application processor sends a closing control signal to the driving chip 21, and the driving chip 21 closes the laser light source 111 after receiving the closing control signal.
Specifically, as shown in fig. 4, the driving chip 21 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 control signal pin. The driving chip 21 may be disposed on the substrate 13. Referring to fig. 4 to 6, the application processor 22 is connected to both the driving chip 21 and the sensor 122, and the application processor 22 receives feedback information of the sensor 122 to identify whether the sensor 122 is abnormal. In one embodiment, the sensor 122 has an abnormality detection function, and when some functional modules, such as the modulation module 25 (shown in fig. 6), have problems, the application processor 22 actively sends corresponding abnormality information to the application processor 22, and the application processor 22 can recognize that there is an abnormality in the sensor 122 after receiving the abnormality information. In another example, sensor 122 continues to send feedback to application processor 22 indicating that it is operating properly, and application processor 22 determines that sensor 122 is abnormal when application processor 22 does not receive the feedback. The application processor 22 may send a control output signal to the driving chip 21, where the control output signal may be the aforementioned shutdown control signal, and when the application processor 22 recognizes that the sensor 122 is abnormal, the application processor sends the shutdown control signal to the driving chip 21, and when the driving chip 21 receives the shutdown control signal, the driving chip 21 shuts down the laser light source 111, so that the laser light source 111 stops emitting laser light outwards.
In summary, in the terminal 100 according to the embodiment of the present invention, the application processor 22 is connected to both the sensor 122 and the driving chip 21, and when it is recognized that the sensor 122 is abnormal, the driving chip 21 is directly controlled to turn off the laser light source 111, so as to prevent the laser from hurting the user, and the safety of the time-of-flight module 10 is high.
Referring again to fig. 6, in some embodiments, the control system 20 further includes a modulation module 25. The modulation module 25 is integrated on the sensor 122. A preset modulation mode is stored in the modulation module 25; the driving chip 21 is connected to the sensor 122, the driving chip 21 can receive the preset modulation mode in the modulation module 25, and the driving chip 21 drives the laser light source 111 to emit laser light according to the preset modulation mode. The application processor 22 is configured to obtain waveform information generated by the laser reflected by the target object and received by the sensor 122 according to the feedback information, and the application processor 22 regards that an abnormality is recognized in the sensor 122 when the waveform information is different from a preset modulation mode.
Specifically, referring to fig. 4, the application processor 22 may be a system of the terminal 100, the application processor 22 is connected to the sensor 122, and the sensor 122 may operate under the control of the application processor 22. Meanwhile, the application processor 22 may further receive a feedback signal (i.e., feedback information) sent by the sensor 122, and when the control output signal is a turn-off control signal, the application processor 22 sends a turn-off control instruction to the driving chip 21 through the communication interface of the driving chip 21, and the driving chip 21 turns off the laser light source 111 in response to the turn-off control instruction, so that the laser light source 111 stops emitting laser light outwards.
The modulation module 25 may send the stored preset modulation mode to the driving chip 21, and when the time-of-flight component 10 normally works, the driving chip 21 drives the laser light source 111 to emit laser light according to the preset modulation mode, where the preset modulation mode may include waveform information of the laser light emitted by the laser light source 111, the preset modulation mode may include multiple preset modulation modes, and in different usage scenarios, the driving chip 21 may drive the laser light source 111 to emit laser light according to different preset modulation modes.
When the application processor 22 can receive feedback information, that is, the application processor 22 can communicate with the sensor 122, waveform information of the laser reflected by the target object and received by the sensor 122 can be acquired according to the feedback information, and then waveform information corresponding to the feedback information is compared with waveform information corresponding to the preset modulation mode to judge whether the modulation module 25 is damaged. Referring to fig. 3 again, in an example, the laser light source 111 emits laser light normally, the preset modulation modes are two, and correspond to the waveform information T1 and the waveform information T2, respectively, and the waveform information T3 corresponding to the feedback information is different from the waveform information T1 and the waveform information T2, at this time, the modulation module 25 may be damaged, or the driving chip 21 may be damaged, or the laser light source 111 may be damaged, which are all considered as damage to the sensor 122, specifically, the modulation module 25 of the sensor 122 is considered as damaged.
The fact that the waveform information corresponding to the feedback information is different from the waveform information corresponding to the preset modulation mode means that the high-level time length of the waveform information corresponding to the feedback information is different from the high-level time length of the waveform information corresponding to the preset modulation mode. In another example, when the application processor 22 cannot receive the feedback information from the sensor 122 after the laser light source 11 emits laser light, that is, the sensor 122 cannot communicate with the application processor 22, it can be determined that the sensor 122 is entirely broken.
When the application processor 22 recognizes that the abnormality is regarded as the modulation module 25 is broken, the application processor 22 may send a shutdown control signal to the sensor 122, the sensor 122 controls the driving chip 21 to shut down the laser light source 111 after receiving the shutdown control signal, the application processor 22 may also directly send the shutdown control signal to the driving chip 21, and the driving chip 21 shuts down the laser light source 111 after receiving the shutdown control signal. When the application processor 22 recognizes that the abnormality is that the sensor 122 is entirely broken, the application processor 22 sends a shutdown control signal to the driver chip 21, and the driver chip 21 shuts down the laser light source 111 after receiving the shutdown control signal. The laser light source 111 is turned off in time when the sensor 122 is abnormal.
Referring again to fig. 2 and 3, in some embodiments, the application processor 22 obtains the waveform information T3 of the laser light reflected by the target object and received by the sensor 122 according to the feedback information, and determines that the sensor 122 is abnormal when the duration of the high level of the waveform information T3 corresponding to the feedback information is greater than a predetermined setting.
Specifically, after acquiring the waveform information T3 of the laser light reflected back by the target object by the sensor 122 according to the feedback information, the application processor 22 then determines whether the duration of the high level of the waveform information T3 corresponding to the feedback information is greater than a predetermined setting, where the predetermined setting may be one or a set of quantitative values, such as 10 ms and 15 ms corresponding to the duration of the high level, and the predetermined setting may also be a variable that varies according to different scenes, such as 15 ms corresponding to the duration of the high level when the ambient light intensity is weak, and 10 ms corresponding to the duration of the high level when the ambient light intensity is strong, and the duration of the high level of the laser light corresponding to the predetermined setting is the maximum duration of the high level that does not harm to people. When the duration of the high level of the waveform information T3 corresponding to the feedback information is longer than the predetermined setting, it indicates that the laser emitted from the laser light source 111 may be harmful to humans, so the application processor 22 recognizes that the sensor 122 is abnormal, and sends a turn-off control signal to the driving chip 21 to turn off the laser light source 111, thereby ensuring the safety of the time-of-flight assembly 10.
Referring to fig. 6, in some embodiments, the sensor 122 has an abnormality detection function, and when the abnormality of the sensor is that the modulation module 24 is damaged, the sensor 122 can directly control the driving chip 21 to turn off the laser source 111.
Specifically, the sensor 122 may detect an abnormality of its internal components, for example, when the sensor 122 detects that the modulation module 24 is damaged, and the sensor 122 is not completely damaged, the sensor 122 may communicate with the driving chip 21, so as to send a shutdown control signal to the driving chip 21 when the modulation module 24 is damaged, and the driving chip 21 shuts down the laser light source 111 after receiving the shutdown control signal. In this way, the sensor 122 can quickly detect the abnormality of itself without determining the abnormality by the application processor 22, and control the driving chip 21 to turn off the laser light source 111 when the abnormality occurs, thereby ensuring the safety of the time-of-flight assembly 10.
Referring to fig. 7, 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 application processor 22, and the power module 26 disconnects power to the laser light source 111 when receiving the shutdown control signal.
Referring to fig. 5, at this time, the application processor 22 may send a control output signal to the power module 26, and when the control output signal is a shutdown control signal, the power module 26 cuts off power supply to the laser light source 111 to achieve the purpose of shutting down the laser light source 111. Specifically, during normal operation of time-of-flight assembly 10, application processor 22 may send a low-level electrical signal to power module 26, power module 26 continues to supply power to laser light source 111, and when application processor 22 sends a high-level electrical signal (which may be considered a shutdown control signal) to power module 26, power module 26 stops supplying power to laser light source 111 in response to the high-level electrical signal until application processor 22 sends a low-level electrical signal to power module 26 again, and power module 26 supplies power to laser light source 111 again.
Referring to fig. 8, in some embodiments, the control system 20 further includes an application processor 22 and a signal generator 27. The application processor 22 is connected to a signal generator 27. The signal generator 27 is connected to the application processor 22. When the signal generator 27 receives the shutdown control signal, it sends a message indicating that the time-of-flight module 10 is abnormal.
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 hurt the user, and the user can take corresponding measures in time to avoid being hurt, 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. 9, 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. 9, in one example, when the signal generator 27 receives the predetermined operation, the application processor 22 stops sending the off control signal and the laser source 111 is turned on again. Taking fig. 9 as an example, the display screen 40 may display a prompt message of "click retry (10S)", the user may click the prompt message, the display screen 40 regards as receiving a predetermined operation after receiving the click operation of the user, the application processor 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 again to fig. 9, in another example, after the application processor 22 sends the shutdown control signal for a predetermined time period, the application processor 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 application processor 22 continues to issue the shutdown control signal when the number of consecutive shutdowns of the laser light source 111 exceeds a predetermined number. After the laser source 111 is turned off and turned back on, the application processor 22 may detect that the time-of-flight device 10 is not operating properly, and then send the turn-off 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 application processor 22 continuously sends a turn-off control signal at this time to prevent the laser light source 111 from being turned on by mistake.
Referring to fig. 10, a control method of the time-of-flight assembly 10 according to the embodiment of the present application includes the steps of:
01: receiving feedback information from sensor 122 to identify whether sensor 122 is abnormal;
02: when the sensor 122 is recognized as abnormal, the laser light source 111 is turned off.
Wherein, the steps 01 and 02 can be implemented by the application processor 22 of the control system 20. The details of the control method can be found in the above description of the control system 20, and are not described herein again.
In the description of the present specification, 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 embodiments or examples is included in at least one embodiment or example of the present 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, "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 comprising a laser light source for emitting laser light and a sensor for receiving the laser light reflected back, the control system comprising:
the driving chip is connected with the laser light source and is used for driving the laser light source to emit the laser; and
the application processor is connected with the sensor and the driving chip and used for receiving feedback information of the sensor to identify whether the sensor is abnormal or not and sending a closing control signal to control the driving chip to close the laser light source when the sensor is identified to be abnormal;
the application processor is used for acquiring the waveform information of the laser received by the sensor and reflected back according to the feedback information, and when the duration of the high level of the waveform information is longer than a preset setting, the sensor is considered to be abnormal, and the preset setting is determined according to the ambient light intensity.
2. The control system of claim 1, wherein the feedback information includes anomaly information actively sent by the sensor to the application processor, the application processor being deemed to identify the sensor anomaly when receiving the anomaly information.
3. The control system of claim 1, wherein the application processor is configured to identify the sensor anomaly when the feedback information for the sensor is not received.
4. The control system of claim 1, further comprising a modulation module integrated with the sensor, the modulation module having a preset modulation scheme stored therein; the driving chip is connected with the sensor to receive the preset modulation mode, and drives the laser light source to emit the laser according to the preset modulation mode; the application processor is used for acquiring waveform information of the laser received by the sensor and reflected back according to the feedback information, and when the waveform information is different from the preset modulation mode, the sensor is considered to be abnormal.
5. The control system of claim 1, further comprising a power module connected to the laser light source and configured to supply power to the laser light source, the power module further connected to the application processor, the power module configured to disconnect power to the laser light source when receiving the shutdown control signal.
6. The control system of claim 1, further comprising:
a signal generator connected to the application processor;
and the signal generator sends out the abnormal prompt information of the flight time assembly after receiving the closing control signal.
7. The control system of claim 6, wherein the application processor stops sending the shutdown control signal and the laser light source is turned back on when the signal generator receives a predetermined operation; or
And after the application processor sends the closing control signal for a preset time, the application processor stops sending the closing control signal, and the laser light source is restarted.
8. The control system of claim 6, wherein the application processor continues to issue the shut down control signal when the number of consecutive shutdowns of the laser light source exceeds a predetermined number.
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 comprising a laser light source and a sensor, the method comprising:
receiving feedback information of the sensor to identify whether the sensor is abnormal; and
when the sensor is identified to be abnormal, the laser light source is turned off;
the receiving feedback information of the sensor to identify whether the sensor is abnormal comprises:
acquiring waveform information of the laser reflected back and received by the sensor according to the feedback information;
and when the duration of the high level of the waveform information is greater than a preset setting, determining that the sensor is abnormal, wherein the preset setting is determined according to the ambient light intensity.
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