CN112269169A - Transmission module, time flight device and electronic equipment - Google Patents
Transmission module, time flight device and electronic equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
- G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
Abstract
The utility model belongs to the technical field of electronic equipment, specifically be about a transmission module, time flight device and electronic equipment, the transmission module includes: the device comprises a light-emitting unit, a photosensitive unit and an anti-interference unit, wherein the light-emitting unit is used for emitting a pulse detection light signal; the photosensitive unit is used for responding to the pulse detection optical signal to generate an electric signal so as to detect the pulse detection optical signal; the anti-interference unit is arranged between the light-emitting unit and the photosensitive unit and used for reducing interference signals in optical signals received by the photosensitive unit. The accuracy of the depth detection of the electronic equipment can be improved.
Description
Technical Field
The disclosure relates to the technical field of electronic equipment, in particular to a transmitting module, a time flight device and electronic equipment.
Background
Time-of-flight devices typically include a transmitter module for transmitting a pulsed probe light signal and a receiver module for receiving the probe light signal reflected by an obstacle in the environment, the receiver module converting the reflected probe light signal into an electrical signal. The transmitting module transmits a plurality of pulse signals in one frame, and the receiving module determines the phase difference of the reflected pulse detection optical signals according to the electric signals converted by the reflected pulse signals, so as to determine the flight time.
In practical application, because the optical power of the plurality of pulse detection optical signals transmitted by the transmitting module in one frame is different, the optical power of the plurality of reflected pulse detection optical signals received by the receiving module is different, so that the electric charge amount excited by each reflected pulse detection optical signal is different, the detection of the flight time is inaccurate, and the detection precision of the time-of-flight device is reduced.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The purpose of the present disclosure is to provide a transmitting module, a time flight device and an electronic apparatus. And further improve the detection accuracy of the time-of-flight device at least to some extent.
According to a first aspect of the present disclosure, there is provided a transmit module for a time-of-flight device, the transmit module comprising:
a light emitting unit for emitting a pulsed detection light signal;
a light sensing unit for generating an electrical signal in response to the pulsed probe light signal to detect the pulsed probe light signal;
the anti-interference unit is arranged between the light-emitting unit and the photosensitive unit and used for reducing interference signals in optical signals received by the photosensitive unit.
According to a second aspect of the present disclosure, there is provided a time-of-flight device comprising:
the transmitting module;
and the receiving module is used for receiving the reflected pulse detection optical signal.
According to a third aspect of the present disclosure, there is provided an electronic device comprising the above time-of-flight apparatus.
The emitting assembly provided by the embodiment of the disclosure detects the pulse detection light signal emitted by the light emitting unit through the photosensitive unit, and then can determine the light power of each pulse detection light signal, so that each pulse detection light signal can be adjusted according to the light power of each pulse detection light signal, the light power of each pulse detection light signal in one frame is consistent, the time detection precision is improved, and the time flight device depth detection precision is improved. Furthermore, interference signals in the optical signals received by the photosensitive unit are reduced through the anti-interference unit, so that the precision of optical power calibration (APC) can be improved, and the precision of depth detection of the time-of-flight device is further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a circuit diagram of a received signal acquisition circuit according to an exemplary embodiment of the present disclosure;
fig. 2 is a waveform diagram of a pulsed probe light signal provided by an exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram of a first transmitting module according to an exemplary embodiment of the disclosure;
fig. 4 is a schematic diagram of a second transmitting module according to an exemplary embodiment of the disclosure;
fig. 5 is a schematic diagram of a laser array provided by an exemplary embodiment of the present disclosure;
fig. 6 is a schematic diagram of a third transmit module provided in an exemplary embodiment of the disclosure;
fig. 7 is a schematic diagram of a fourth transmit module provided in an exemplary embodiment of the disclosure;
fig. 8 is a schematic diagram of a fifth transmitting module according to an exemplary embodiment of the disclosure;
fig. 9 is a schematic diagram illustrating a waveform adjustment of a pulsed probe light signal according to an exemplary embodiment of the present disclosure;
FIG. 10 is a schematic illustration of a time-of-flight device provided in an exemplary embodiment of the present disclosure;
fig. 11 is a schematic view of an electronic device provided in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
Time of Flight (Time of Flight) is an active transmission 3D imaging technology, and generally includes a transmission module, a reception module, and a processing chip. The transmitting module can emit modulated near-infrared light, the modulated near-infrared light is reflected after being irradiated to an object, and after the receiving module receives a transmitting light signal, the distance for shooting the object is obtained through calculation by calculating the time difference or phase difference between light transmitting and reflecting, and depth information is formed.
The time flight image sensor comprises a transmitting module and a receiving module, wherein the transmitting module and the receiving module can be integrated on the base, and the receiving module is arranged on one side of the transmitting module. The transmitting module is used for transmitting detection light (infrared light), the detection light is reflected when meeting an obstacle, and the receiving module receives the reflected light.
One of the core devices in the transmit module is a Vertical Cavity Surface Emitting Laser (VCSEL). The VCSEL, as a novel laser device emitting from a vertical surface, has advantages in laser divergence angle, light emitting efficiency, tunable frequency of a light source, light field distribution, manufacturing process, cost, and the like, and thus is widely applied to projection devices of three-dimensional imaging systems such as time flight sensors of mobile phones and AR devices.
The receiving module can include photoelectric conversion unit and output circuit, and output circuit and photoelectric conversion unit are connected, and photoelectric conversion unit is used for converting light signal into the signal of telecommunication, and output circuit handles and exports the signal of telecommunication. The photoelectric conversion unit may include a photodiode PD, and a photodiode array may be disposed in the receiving module. For example, as shown in fig. 1, the output circuit may include a first switching unit K1, a second switching unit K2, a third switching unit K3, a fourth switching unit K4, a fifth switching unit K5, a sixth switching unit K6, a first capacitor C1, and a second capacitor C2. A first terminal of the first switching unit K1 is connected to the photodiode, a second terminal of the first switching unit K1 is connected to the first node, the first capacitor C1 is connected to the first node, a first terminal of the second switching unit K2 receives the reset signal Vrst, a second terminal of the second switching unit K2 is connected to the first node, a first terminal of the third switching unit K3 is connected to the first node, and a second terminal of the third switching unit K3 is connected to the output terminal OUT 1. The first end of the fourth switching unit K4 is connected to the photodiode, the second end of the fourth switching unit K4 is connected to the second node, the second capacitor C2 is connected to the second node, the first end of the fifth switching unit K5 receives the reset signal Vrst, the second end of the fifth switching unit K5 is connected to the second node, the first end of the sixth switching unit K6 is connected to the second node, and the second end of the sixth switching unit K6 is connected to the output terminal OUT 2.
Illustratively, the transmitting module transmits four pulsed detection light signals in one frame, the four pulsed detection light signals being transmitted at 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. The power and time of receiving the optical signal by the receiving module are affected by the peak optical power of the VCSEL of the transmitting module, the optical power of the four-phase pulse detection optical signal in a single frame, the driving current of the driving chip, and the voltage of the VCSEL. For example, as shown in fig. 2, the four phase pulse detection optical signals in a single frame cause an error in the amount of charge detected by the receiving module due to the inconsistency of the optical powers of the four phase pulse detection optical signals in the single frame, and an error may exist when the depth information is demodulated by the following formula.
Where d is depth, c is speed of light, f0To transmit frequency, I0、I90、I180、I270The received currents for the four phases.
An exemplary embodiment of the present disclosure first provides a transmitting module for a time-of-flight device, as shown in fig. 3, the transmitting module includes: the system comprises a light emitting unit 110, a light sensing unit 120 and an anti-interference unit 130, wherein the light emitting unit 110 is used for emitting a pulse detection light signal; the light sensing unit 120 is configured to convert the received optical signal into an electrical signal to detect a pulse detection optical signal; the interference prevention unit 130 is disposed between the light emitting unit 110 and the light sensing unit 120, and the interference prevention unit 130 is configured to reduce an interference signal in the light signal received by the light sensing unit 120.
The emitting assembly provided by the embodiment of the present disclosure detects the pulse detection optical signal emitted by the light emitting unit 110 through the photosensitive unit 120, and then can determine the optical power of each pulse detection optical signal, so that each pulse detection optical signal can be adjusted according to the optical power of each pulse detection optical signal, and the optical power of each pulse detection optical signal in one frame is consistent, thereby improving the accuracy of time detection, and further improving the accuracy of depth detection of a time-of-flight device. Furthermore, the interference signal in the optical signal received by the light sensing unit 120 is reduced by the interference prevention unit 130, so that the accuracy of the detection result of the light sensing unit 120 can be improved, and the accuracy of the depth detection of the time flight device is further improved.
Further, the emission module provided by the embodiment of the present disclosure may further include a package housing 140, and the light emitting unit 110, the light sensing unit 120, and the anti-interference unit 130 are disposed on the package housing 140. The package housing 140 may have an accommodating cavity with an opening at one end, the light emitting unit 110 is disposed in the accommodating cavity, and the light emitting surface of the light emitting unit 110 faces the opening of the package housing 140. The photosensitive unit 120 is disposed in the accommodating cavity, and a photosensitive surface of the photosensitive unit 120 may face the opening of the package housing 140, and certainly, the photosensitive surface of the photosensitive unit 120 may be disposed in other directions in practical applications.
The following will describe each part of the transmitting module provided by the embodiment of the present disclosure in detail:
the transmitting module provided by the embodiment of the disclosure can be a transmitting module of a speckle type indirect time flight device or a transmitting module of a floodlight type indirect time flight device and the like.
As shown in fig. 3, when the transmitting module is a transmitting module of a speckle type indirect time flight device, the light emitting unit 110 may include a laser array 111, a collimating lens 112 and a Diffractive element 113 (DOE), the collimating lens 112 is disposed on the light emitting side of the laser array 111, and the Diffractive element 113 is disposed on a side of the collimating lens 112 away from the laser array 111. The laser array 111, the collimating lens 112 and the diffraction element 113 are disposed in the accommodating cavity of the package housing 140.
The laser array 111 may be a vertical cavity surface emitting laser array 111, and the laser array 111 may emit a plurality of arrayed probe lights. The vertical cavity surface emitting laser may include a substrate. And a light emitting layer, the vertical cavity surface emitting laser being capable of generating light and a substrate. A perpendicular laser beam. The vertical cavity surface emitting laser array 111 includes a plurality of vertical cavity surface emitting lasers therein so that the vertical cavity surface emitting laser array 111 can generate a plurality of laser beams perpendicular to the substrate. The vertical cavity surface emitting laser has the advantages of small far field divergence angle, narrow and round emitted light beam, easy coupling with optical fibers, low threshold current, high modulation frequency and easy realization of large-scale array and photoelectric integration. Of course, in practical applications, the light source of the light emitting unit 110 may be other light sources, and the embodiment of the disclosure is not limited thereto.
The collimating lens 112 is disposed on the light-emitting side of the vcsel array 111, the collimating lens 112 is an optical device, and the collimating lens 112 is configured to align the light beam emitted from the vcsel array 111 with the light-emitting direction to form a collimated light beam or a parallel light beam. Thereby preventing or at least minimizing the spread of the light beam with distance. The collimating lens 112 may include one or more lenses, and the collimating lens 112 may include various lens combinations such as a concave lens, a convex lens, a plane mirror, and the like.
The diffraction element 113 may also be provided with a protective layer on the side of the diffraction element 113 remote from the collimator lens 112. The diffraction element 113 serves to split the laser beam. The diffraction element 113 further splits the laser beam emitted from the vertical cavity surface emitting laser by the microstructure of the surface. The speckle image is represented by a laser speckle image emitted by the vertical cavity surface emitting laser, which is copied by the diffraction element 113, and the speckle image with uniform energy and more points is generated and then projected into a three-dimensional space.
The diffraction element 113 generally adopts a micro-nano etching process to form diffraction units distributed in two dimensions on a diffraction light sheet, each diffraction unit may have a specific shape, a specific refractive index, and the like, and the diffraction units can perform fine control (such as beam splitting or shaping, and the like) on the phase distribution of the laser wavefront. The laser is diffracted after passing through each diffraction unit, and generates interference at a certain distance to form a specific light intensity distribution (namely, a speckle image).
The protective layer is provided on the diffraction element 113, and the protective layer is a transparent protective layer for protecting the diffraction element 113. The protective layer may cover the side of the diffraction element 113 near the collimating lens 112, or the protective layer may cover both sides of the diffraction element 113. The protective layer may be an ITO (indium tin oxide) layer, or the protective layer may also be another transparent material layer, which is not limited in the embodiments of the present disclosure.
When the emitting module is a floodlight type indirect time flight device, as shown in fig. 6, the light emitting unit 110 may include a laser array 111 and a diffusing element 114, the diffusing element 114 is disposed on a light emitting side of the laser array 111, and the diffusing element 114 is configured to homogenize light emitted by the laser array 111. The diffusion member may include a diffusion sheet.
The vertical cavity surface laser array 111 emits a light source with a preset wavelength, the light with the preset wavelength irradiates a diffusion sheet, the diffusion sheet shapes and homogenizes light spots of the light source through a surface microstructure, and finally the light spots are projected on a space plane at a certain emission angle.
The light sensing unit 120 may include a photodiode, which may be disposed in a receiving cavity inside the package case 140, and which may be located at one side of the laser array 111. When the photodiode receives the optical signal, the optical signal is converted into an electrical signal by the photodiode.
When the laser array 111 emits light, a portion of the light is transmitted to the photodiode, which generates an electrical signal in response to the optical signal. Since the laser array 111 emits periodic pulse probe light, the light signal received by the photodiode is also periodic, and the photodiode receives a pulse light signal to generate an electrical signal. In practical applications, the optical power of the multiple pulse detection lights in a single frame needs to be consistent, that is, the electrical signals detected by the photodiodes need to be consistent. When the photodiode detects that the plurality of pulsed detection light signals in a single frame are not identical, the plurality of pulsed detection light signals in a single frame can be made identical by adjusting the driving signal of the laser array 111.
The interference prevention unit 130 is disposed between the light emitting unit 110 and the light sensing unit 120, and the interference prevention unit 130 is configured to reduce an interference signal in an optical signal received by the light sensing unit 120. Interference signals in the optical signals received by the photosensitive unit 120 are reduced through the anti-interference unit 130, and the detection precision of the photosensitive unit 120 can be improved, so that the pulse detection optical signals can be more accurately adjusted, and the precision of depth detection is improved.
In a possible embodiment of the present disclosure, the anti-interference unit 130 includes a light guide 131, a first end of the light guide 131 is connected to the light sensing unit 120, and a second end of the light guide 131 is connected to the light emitting unit 110. The light guide 131 extends from the light sensing unit 120 to the light emitting unit 110.
In practical applications, because the linear region of the photodiode is limited, the photodiode is prevented from operating in a non-linear region due to excessive optical power received by the photodiode. The interference rejection unit 130 may further include an optical attenuator (not shown), which is disposed on the light guide 131 and is used for attenuating the power of light in the light guide 131.
When the emission module includes the laser array 111, the collimating lens 112 and the diffraction element 113, as shown in fig. 3, the second end of the light guide 131 may be connected to the laser array 111, that is, the light guide 131 extends from the light sensing unit 120 to the laser array 111. Alternatively, as shown in fig. 4, the second end of the light guide 131 is connected to the side of the diffraction element 113 close to the collimating lens 112, and the light guide 131 extends from the light sensing unit 120 to the diffraction element 113.
When the emission module includes the laser array 111 and the diffusion element 114, as shown in fig. 6, the second end of the light guide 131 may be connected to the laser array 111, that is, the light guide 131 extends from the light sensing unit 120 to the laser array 111. Alternatively, as shown in fig. 7, the second end of the light guide 131 is connected to the side of the diffusion element 114 close to the laser array 111, that is, the light guide 131 extends from the photosensitive unit 120 to the diffusion element 114.
The light guide 131 may be an optical fiber or a light guide plate. When the light guide 131 is an optical fiber, a first end of the optical fiber may be connected to the photodiode, and a second end of the optical fiber is connected to the laser array 111. For example, the second end of the optical fiber may be connected to an exit aperture of the laser array 111.
As shown in FIG. 5, the laser array 111 may include a detection zone 1111 and a detection zone 1112, with the second end of the optical fiber coupled to the detection zone 1112. The detection zone 1111 emits light for depth detection and the detection zone 1112 emits light for pulsed detection. The optical power of each beam in the detection zone 1111 is the same as the optical power of the detection zone 1112. By attaching the second end of the fiber to the detection zone 1112, the fiber is prevented from affecting the light in the detection zone 1111.
By way of example, the detection zone 1111 of the laser array 111 may be a rectangular zone or a circular zone. The detection region 1112 may be located on one side of the detection region 1111, with the detection region 1112 being proximate to the photosensitive unit 120.
The light inlet surface of the light sensing unit 120 may be provided with a light shielding layer 150, the light shielding layer 150 is provided with a light-transmitting notch, and the light guide member 131 penetrates through the light-transmitting notch. The light shielding layer 150 shields the light entering surface of the light sensing unit 120 to prevent stray light from entering the light sensing unit 120, thereby improving the detection accuracy. The light-shielding layer 150 is made of a non-light-transmitting material, such as a black light-shielding layer 150.
It is understood that when the transmitting module comprises the laser array 111, the collimating lens 112 and the diffraction element 113, the second end of the optical fiber can be connected to the laser array 111, or the second end of the optical fiber can be connected to the side of the diffraction element 113 close to the collimating lens 112.
When the transmitting module comprises the laser array 111 and the diffusing element 114, the second end of the optical fiber may be connected to the laser array 111, or the second end of the optical fiber may be connected to a side of the diffusing element 114 close to the laser array 111.
When the light guide member 131 is a light guide plate, the light guide plate may be covered with a light shielding layer for preventing light loss. The first end of the light guide plate may be connected to the photodiode and the second end of the light guide plate is connected to the laser array 111. For example, the second end of the light guide plate may be connected to a light outlet of the laser array 111.
The laser array 111 may include a detection zone 1111 and a detection zone 1112, and the second end of the light guide plate is connected to the detection zone 1112. The detection zone 1111 emits light for depth detection and the detection zone 1112 emits light for pulsed detection. The optical power of each beam in the detection zone 1111 is the same as the optical power of the detection zone 1112. By connecting the second end of the light guide plate to the detection region 1112, the light guide plate is prevented from affecting the light in the detection region 1111.
By way of example, the detection zone 1111 of the laser array 111 may be a rectangular zone or a circular zone. The detection region 1112 may be located on one side of the detection region 1111, with the detection region 1112 being proximate to the photosensitive unit 120.
The light inlet surface of the light sensing unit 120 may be provided with a light shielding layer 150, the light shielding layer 150 is provided with a light-transmitting notch, and the light guide member 131 penetrates through the light-transmitting notch. The light shielding layer 150 shields the light entering surface of the light sensing unit 120 to prevent stray light from entering the light sensing unit 120, thereby improving the detection accuracy. The light-shielding layer 150 is made of a light-impermeable material, such as a black light-shielding layer.
It is understood that when the emission module includes the laser array 111, the collimating lens 112 and the diffraction element 113, the second end of the light guide plate may be connected to the laser array 111, or the second end of the light guide plate may be connected to a side of the diffraction element 113 close to the collimating lens 112.
When the emission module includes the laser array 111 and the diffusion element 114, the second end of the light guide plate may be connected to the laser array 111, or the second end of the light guide plate may be connected to a side of the diffusion element 114 close to the laser array 111.
Alternatively, as shown in fig. 8, the anti-interference unit 130 provided in the embodiment of the present disclosure may include a light barrier 132, the light emitting unit 110 includes a laser array 111, the laser array 111 is configured to emit a pulse detection light, and the photosensitive unit 120 is disposed at one side of the laser array 111; the light barrier 132 is disposed between the laser array 111 and the light sensing unit 120, and is used for isolating the laser array 111 from the light sensing unit 120.
The light blocking plate 132 may be disposed in the package housing 140, the light blocking plate 132 extends from one sidewall of the accommodating chamber to the other sidewall of the accommodating chamber, the accommodating chamber is divided into two parts by the light blocking plate 132, and the laser array 111 and the photosensitive unit 120 are respectively located at two sides of the light blocking plate 132. The light barrier 132 separates the laser array 111 and the photosensitive unit 120, and prevents the light emitted from the laser array 111 from directly irradiating the photosensitive unit 120. The light receiving unit 120 receives light reflected by the diffraction element 113 or the diffusion element 114, and detects a pulse detection light signal.
The package body 140 may be a ceramic package body 140, such as a ceramic substrate, on which the light emitting unit 110 and the light sensing unit 120 may be disposed, and a circuit board and other devices may be disposed on the ceramic substrate. Of course, in practical applications, the package housing 140 may be made of other materials, and the embodiments of the disclosure are not limited thereto.
Further, the emission module that this disclosed embodiment provided can also include the control unit (not shown in the figure), and the control unit connects luminescence unit 110 and sensitization unit 120 respectively, and the control unit control luminescence unit 110 launches a plurality of pulse detection light signals when a frame to control sensitization unit 120 and detect every pulse detection light signal, it is unanimous to adjust a plurality of pulse light signals when a plurality of pulse detection light signals are different.
The control unit may include a processor connected to the laser driving circuit and the light sensing unit 120, and a laser driving circuit connected to the laser array 111. Initially, the laser driving circuit sends an initial driving signal to the laser array 111, and the laser array 111 emits a pulsed probe light signal in response to the initial driving signal. The light sensing unit 120 receives a light signal and converts the light signal into an electrical signal. The processor receives the electrical signal and analyzes the plurality of pulsed probe light signals in a single frame. As shown in fig. 9, the processor adjusts the plurality of pulsed detection light signals to make the electrical signals generated by the light sensing unit 120 in response to the plurality of pulsed detection light signals uniform. Therefore, each pulse detection optical signal transmitted by the transmitting module in a single frame is ensured to be consistent.
The emitting assembly provided by the embodiment of the present disclosure detects the pulse detection optical signal emitted by the light emitting unit 110 through the photosensitive unit 120, and then can determine the optical power of each pulse detection optical signal, so that each pulse detection optical signal can be adjusted according to the optical power of each pulse detection optical signal, and the optical power of each pulse detection optical signal in one frame is consistent, thereby improving the accuracy of time detection, and further improving the accuracy of depth detection of a time-of-flight device. Furthermore, the interference signal in the optical signal received by the light sensing unit 120 is reduced by the interference prevention unit 130, so that the accuracy of the detection result of the light sensing unit 120 can be improved, and the accuracy of the depth detection of the time flight device is further improved.
The interference of multipath stray light inside the emission module on the photodiode is limited through the anti-interference unit, the consistency problem of photodiode optical power calibration of a large batch of TOF emission modules can be solved, the depth ranging precision of the large batch of emission modules is improved, and large-scale flow operation of a PD calibration machine is facilitated.
The exemplary embodiments of the present disclosure also provide a time-of-flight device, as shown in fig. 10, the time-of-flight device 10 including: the transmitting module 01 and the receiving module 20 are described above, and the receiving module 20 is used for receiving the reflected pulse detection optical signal.
The transmission module 01 includes: the system comprises a light emitting unit 110, a light sensing unit 120 and an anti-interference unit 130, wherein the light emitting unit 110 is used for emitting a pulse detection light signal; the light sensing unit 120 is configured to convert the received optical signal into an electrical signal to detect a pulse detection optical signal; the interference prevention unit 130 is disposed between the light emitting unit 110 and the light sensing unit 120, and the interference prevention unit 130 is configured to reduce an interference signal in the light signal received by the light sensing unit 120.
A plurality of photodiodes may be distributed in an array on the receiving module 02, and the photodiodes receive the light beams reflected by the obstacle. And converting the optical signal reflected by the obstacle into an electrical signal, and finally forming a depth image.
The time-of-flight device provided by the embodiment of the present disclosure detects the pulse detection optical signal emitted by the light-emitting unit 110 through the photosensitive unit 120, and then can determine the optical power of each pulse detection optical signal, so that each pulse detection optical signal can be adjusted according to the optical power of each pulse detection optical signal, and the optical power of each pulse detection optical signal in one frame is consistent, thereby improving the accuracy of time detection, and further improving the accuracy of depth detection of the time-of-flight device. Furthermore, the interference signal in the optical signal received by the light sensing unit 120 is reduced by the interference prevention unit 130, so that the accuracy of the detection result of the light sensing unit 120 can be improved, and the accuracy of the depth detection of the time flight device is further improved.
The exemplary embodiments of the present disclosure also provide an electronic device including the time-of-flight device 10 described above.
The electronic device provided by the embodiment of the present disclosure detects the pulse detection optical signal emitted by the light emitting unit 110 through the photosensitive unit 120, and then can determine the optical power of each pulse detection optical signal, so that each pulse detection optical signal can be adjusted according to the optical power of each pulse detection optical signal, and the optical power of each pulse detection optical signal in one frame is consistent, thereby improving the accuracy of time detection, and improving the accuracy of depth detection of a time-of-flight device. Furthermore, the interference signal in the optical signal received by the light sensing unit 120 is reduced by the interference prevention unit 130, so that the accuracy of the detection result of the light sensing unit 120 can be improved, and the accuracy of the depth detection of the time flight device is further improved.
The electronic equipment provided by the embodiment of the disclosure can be a mobile phone, a tablet computer, augmented reality glasses, vehicle-mounted equipment, a camera and the like.
The following describes the electronic device provided by the embodiment of the present disclosure in detail by taking the electronic device as a mobile phone as an example:
as shown in fig. 11, the electronic device may further include a middle frame 20, a main board 30, a display screen 70, a battery 40, and the like, where the display screen 70, the middle frame 20, and the rear cover 50 form a receiving space for receiving other electronic components or functional modules of the electronic device. Meanwhile, the display screen 70 forms a display surface of the electronic device for displaying information such as images, texts, and the like. The Display screen 70 may be a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.
A glass cover plate may be provided on the display screen 70. Wherein the glass cover plate may cover the display screen 70 to protect the display screen 70 from being scratched or damaged by water.
The display screen 70 may include a display area as well as a non-display area. Wherein the display area performs the display function of the display screen 70 for displaying information such as images, text, etc. The non-display area does not display information. The non-display area can be used for arranging functional modules such as a camera, a receiver, a proximity sensor and the like. In some embodiments, the non-display area may include at least one area located at an upper portion and a lower portion of the display area.
The display screen 70 may be a full-face screen. At this time, the display screen 70 may display information in full screen, so that the electronic device has a larger screen occupation ratio. The display screen 70 includes only display areas and no non-display areas.
The middle frame 20 may be a hollow frame structure. The material of the middle frame 20 may include metal or plastic. The main board 30 is mounted inside the receiving space. For example, the main board 30 may be mounted on the middle frame 20 and be received in the receiving space together with the middle frame 20. The main board 30 is provided with a grounding point to realize grounding of the main board 30.
One or more of the functional modules such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a proximity sensor, an ambient light sensor, a gyroscope, and a processor may be integrated on the main board 30. Meanwhile, the display screen 70 may be electrically connected to the main board 30.
Wherein, the sensor module can include degree of depth sensor, pressure sensor, gyroscope sensor, baroceptor, magnetic sensor, acceleration sensor, distance sensor, be close optical sensor, fingerprint sensor, temperature sensor, touch sensor, ambient light sensor and bone conduction sensor etc.. The Processor may include an Application Processor (AP), a modem Processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband Processor, and/or a Neural Network Processor (NPU), and the like. The different processing units may be separate devices or may be integrated into one or more processors.
The main board 30 is also provided with a display control circuit. The display control circuit outputs an electrical signal to the display screen 70 to control the display screen 70 to display information. The light emitting control unit and the color change control unit may be provided on the main board.
The battery 40 is mounted inside the receiving space. For example, the battery 40 may be mounted on the middle frame 20 and be received in the receiving space together with the middle frame 20. The battery 40 may be electrically connected to the motherboard 30 to enable the battery 40 to power the electronic device. The main board 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic components in the electronic device.
The rear cover 50 serves to form an outer contour of the electronic apparatus. The rear cover 50 may be integrally formed. In the forming process of the rear cover 50, a rear camera hole, a fingerprint identification module mounting hole and the like can be formed in the rear cover 50. The time-of-flight device 10 provided by the embodiment of the present disclosure may be disposed on the middle frame 70 or the main board 30, and the time-of-flight device 10 is exposed to the rear cover 50 of the electronic apparatus.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (13)
1. A transmit module for a time-of-flight device, the transmit module comprising:
a light emitting unit for emitting a pulsed detection light signal;
a light sensing unit for generating an electrical signal in response to the pulsed probe light signal to detect the pulsed probe light signal;
the anti-interference unit is arranged between the light-emitting unit and the photosensitive unit and used for reducing interference signals in optical signals received by the photosensitive unit.
2. The transmit module of claim 1, wherein the immunity unit comprises:
the first end of the light guide piece is connected with the photosensitive unit, and the second end of the light guide piece is connected with the light emitting unit.
3. The transmit module of claim 2, wherein the immunity unit further comprises:
the light attenuation piece is arranged on the light guide piece and used for attenuating the power of light in the light guide piece.
4. The emission module as claimed in claim 2, wherein a light-shielding layer is disposed on the light-inlet surface of the light-sensing unit, a light-transmitting gap is disposed on the light-shielding layer, and the light-guiding member is disposed through the light-transmitting gap.
5. The emission module of claim 2, wherein the light emitting unit comprises:
a laser array for emitting the pulsed probe light signal.
6. The transmitter module as claimed in claim 5, wherein the second end of the light guide is connected to the light emitting surface of the laser array.
7. The transmit module of claim 6, wherein the laser array comprises a detection region and a detection region, the second end of the light guide being coupled to the detection region.
8. The emission module of claim 5, wherein the light emitting unit further comprises:
the collimating lens is arranged on the light emitting side of the laser array;
the diffraction element is arranged on one side, far away from the laser array, of the collimating lens, and the second end of the light guide piece is located on one side, close to the collimating lens, of the diffraction element.
9. The emission module of claim 5, wherein the light emitting unit further comprises:
the diffusion element is arranged on the light emitting side of the laser array, and the second end of the light guide piece is located on one side, close to the laser array, of the diffusion element.
10. The emission module of claim 1, wherein the light emitting unit comprises:
the laser array is used for emitting pulse detection light, and the photosensitive unit is arranged on one side of the laser array;
the anti-jamming unit includes:
the light barrier is arranged between the laser array and the photosensitive unit and used for isolating the laser array and the photosensitive unit.
11. The transmit module of claim 1, wherein the transmit module further comprises:
the control unit, the control unit connects respectively the luminescence unit with the sensitization unit, the control unit control the luminescence unit launches a plurality of pulse detection light signals when a frame, and control the sensitization unit detects every the pulse detection light signal, it is a plurality of to adjust when a plurality of pulse detection light signals are different the pulse light signal is unanimous.
12. A time-of-flight device, comprising:
the transmitter module of any of claims 1-11;
and the receiving module is used for receiving the reflected pulse detection optical signal.
13. An electronic device, characterized in that it comprises a time-of-flight device according to claim 12.
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| CN202011241686.5A CN112269169A (en) | 2020-11-09 | 2020-11-09 | Transmission module, time flight device and electronic equipment |
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| CN202011241686.5A CN112269169A (en) | 2020-11-09 | 2020-11-09 | Transmission module, time flight device and electronic equipment |
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