CN116794829A - Optical fiber scanning device, scanning detection method and scanning display equipment - Google Patents
Optical fiber scanning device, scanning detection method and scanning display equipment Download PDFInfo
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- CN116794829A CN116794829A CN202310582816.9A CN202310582816A CN116794829A CN 116794829 A CN116794829 A CN 116794829A CN 202310582816 A CN202310582816 A CN 202310582816A CN 116794829 A CN116794829 A CN 116794829A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 310
- 238000001514 detection method Methods 0.000 title claims abstract description 180
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- 238000011897 real-time detection Methods 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
- G01V8/18—Detecting, e.g. by using light barriers using one transmitter and one receiver using mechanical scanning systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
- G01V8/26—Detecting, e.g. by using light barriers using multiple transmitters or receivers using mechanical scanning systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
Abstract
The invention discloses an optical fiber scanning device, a scanning detection method and scanning display equipment, which are used for detecting the posture of an optical fiber in the scanning process of the optical fiber scanning device. The optical fiber scanning device comprises a shell, an actuator and an optical fiber, wherein the actuator and the optical fiber are arranged in the shell, the part of the optical fiber, which exceeds the actuator, forms an optical fiber cantilever, at least one group of optical fiber detection devices corresponding to the movement direction of the actuator are arranged on the inner side of the shell, each group of optical fiber detection devices comprises a detection light source and a corresponding optical detector, the detection light source and the optical detector are oppositely arranged on two sides of the optical fiber cantilever, the detection light source is used for emitting detection light, and the optical detector is used for generating corresponding electric signals as detection signals according to the detection light received by a detection target surface of the optical detector for feedback; and the processor is respectively connected with the optical detector and the actuator and is used for determining whether the actual movement track of the optical fiber cantilever is consistent with the calibration movement track according to the detection signals fed back by the optical detector, and if the actual movement track is determined to deviate from the calibration track, adjusting the driving signal of the actuator, and correcting the movement track of the optical fiber until the actual movement track is consistent with the calibration movement track.
Description
The application discloses a divisional application of an optical fiber scanning device, a scanning detection method and a scanning display device, wherein the application date is 2019, 09 and 04, the application number is 201910831691.2.
Technical Field
The present application relates to the field of display technologies, and in particular, to an optical fiber scanning device, a scanning detection method, and a scanning display apparatus.
Background
The imaging principle of the optical fiber scanning projection technology is as follows: the actuator drives the scanning optical fiber to perform the movement of a preset two-dimensional scanning track, and simultaneously modulates the light emitting power of the light source, and each pixel point information of the image to be displayed is projected onto an imaging area one by one, so that a projection picture is formed.
Fig. 1A and 1B are schematic structural views of a conventional optical fiber scanning projection system, wherein fig. 1B is a side view of fig. 1A. The fiber scanner projection system includes: processor 100, laser group 110, optical fiber scanner 120, optical fiber 130, light source modulation circuit 140, scan driving circuit 150, and beam combining unit 160. In operation, the processor 100 controls the optical fiber scanner 120 to vibrate and scan by sending an electrical control signal to the scan driving circuit 150, and at the same time, the processor 100 controls the light output of the light source beam combining module 160 by sending an electrical control signal to the light source modulating module 140. The light source modulation module 140 outputs a light source modulation signal according to the received electric control signal to modulate the light source unit 110 of one or more colors in the light source beam combining module 160, which is shown to include red (R), green (G), and blue (B) lasers; the light generated by the light source unit 110 of each color in the light source beam combination module 160 is combined to generate color and gray information of each pixel point one by one, and the combined light beam emitted by the light source beam combination module is led into the optical fiber scanner through the optical fiber. In synchronization, the scan driving circuit 150 outputs a scan driving signal according to the received electric control signal to control the optical fiber 130 in the optical fiber scanner 120 to perform a movement in a predetermined two-dimensional scan trajectory, thereby scanning out the light beam transmitted in the transmission optical fiber 130.
However, in actual operation of the optical fiber scanner, the motion track and the state deviate from the ideal mode due to factors such as interference vibration, driving fluctuation, temperature and humidity, aging fatigue, nonlinearity, etc., so that degradation of the display image quality occurs in the long-time working process, and therefore online real-time detection and feedback compensation measures are required to maintain high-image-quality display, but no better detection mode exists at present.
Disclosure of Invention
The invention aims to provide an optical fiber scanning device, a scanning detection method and scanning display equipment, which are used for detecting the posture of an optical fiber in the scanning process of the optical fiber scanning device and improving the scanning display effect of the optical fiber scanning device.
In order to achieve the above object, according to a first aspect, the present invention provides an optical fiber scanning device, including a housing, an actuator disposed in the housing, and an optical fiber, where the optical fiber is fixed on the actuator, a portion of an optical output end of the optical fiber that exceeds the actuator forms an optical fiber cantilever, and the actuator drives the optical fiber to perform two-dimensional scanning in space under control of a driving signal, where at least one group of optical fiber detecting devices corresponding to a moving direction of the actuator is disposed on an inner side of the housing, and each group of optical fiber detecting devices includes a detecting light source and a light detector corresponding to the detecting light source, where the detecting light source and the light detector are disposed on two sides of the optical fiber cantilever, and the detecting light source is used for outputting detecting light, and the light detector is used for generating a corresponding electrical signal as a detecting signal to feed back according to light received by a detecting target surface of the light source; and in the process of starting scanning of the optical fiber cantilever, the optical fiber cantilever intermittently shields the detection light emitted by the detection light source to the light detector.
Optionally, the optical fiber scanning device further includes: and the processor is respectively connected with the optical detector and the actuator and is used for determining whether the actual movement track of the optical fiber cantilever is consistent with the calibration movement track according to the detection signals fed back by the optical detector, and if the actual movement track is determined to deviate from the calibration track, adjusting the driving signal of the actuator, and correcting the movement track of the optical fiber until the actual movement track is consistent with the calibration movement track.
Optionally, the processor is further configured to adjust the scanning track to be a straight line when it is determined that the motion track of the optical fiber is different from the calibration motion track through the phase or the elliptical inclination of the motion track.
Optionally, the diameter of the detection target surface of the optical detector is greater than or equal to the diameter of the optical fiber; and/or the bandwidths of the optical detector and the detection circuit correspond to the optical fiber swing frequency.
Optionally, the actuator drives the optical fiber to scan along the XY direction under the control of the driving signal, and the outgoing light direction of the detection light source in the optical fiber detection device includes the X direction and/or the Y direction.
Optionally, when a plurality of groups of optical fiber detecting devices are disposed in one movement direction of the optical fiber, the plurality of groups of optical fiber detecting devices are disposed in sequence along the movement direction or the extension direction of the optical fiber.
Optionally, when the optical fiber cantilever is in a static state, the optical fiber cantilever shields the detection light emitted by at least one detection light source.
Optionally, the optical fiber detector device is disposed at a position when the optical fiber is in a static state or at a center point position when the optical fiber swings.
In a third aspect, an embodiment of the present invention provides a scanning detection method, applied to the optical fiber scanning device according to the first aspect, where the method includes:
in the optical fiber scanning process, controlling the detection light source to emit detection light, wherein the detection light is emitted to the light detector on the light emitting path;
generating a detection signal according to the detection light detected on the detection target surface of the light detector; the detection signal comprises information for representing that the optical fiber cantilever indirectly shields detection light emitted by the detection light source to the light detector in a scanning process;
and feeding back the detection signal.
Optionally, after feeding back the probe signal, the method further includes:
determining whether the current actual motion trail of the optical fiber cantilever is consistent with a calibration motion trail according to the detection signal;
and if the two are inconsistent, adjusting a driving signal of the actuator to correct the motion trail of the optical fiber cantilever to be the calibration motion trail.
Optionally, the determining, according to the detection signal, whether the current actual motion trajectory of the optical fiber cantilever is consistent with the calibration motion trajectory includes:
determining a waveform diagram corresponding to the detection signal;
determining at least one characteristic parameter representing the actual motion trail corresponding to the optical fiber according to the waveform diagram; wherein the at least one characteristic parameter comprises one or more of signal pulse width, amplitude, phase;
comparing the at least one characteristic parameter with at least one corresponding calibration characteristic parameter in the calibration motion trail to determine whether the at least one characteristic parameter and the corresponding calibration characteristic parameter are consistent;
determining whether the current actual motion trail of the optical fiber cantilever deviates from the calibrated motion trail according to the comparison result; and if the characteristic parameters are inconsistent with the calibration characteristic parameters, determining that the actual motion trail of the optical fiber deviates from the calibration motion trail.
Optionally, if the actuator drives the optical fiber to scan along the XY direction under the control of the driving signal, the adjusting the driving signal of the optical fiber scanner corrects the motion track of the optical fiber cantilever to the calibration track includes:
Determining the displacement of the optical fiber in the X/Y direction and the displacement component in the Y/X direction according to the difference between the at least one characteristic parameter and the at least one calibration characteristic parameter;
determining a correction driving signal in the Y/X direction according to the displacement component; the correction driving information is used for controlling the actuator to drive the optical fiber to generate displacement opposite to the displacement component in the Y/X direction;
and driving the actuator by adopting the correction driving signal so that the actuator drives the optical fiber to scan according to the calibration motion trail.
In a third aspect, an embodiment of the present invention provides a scanning display device, including a light source and the optical fiber scanning device according to the first aspect, where the light source modulates and emits image light of an image to be displayed, and the image light is scanned and emitted by the optical fiber scanning device to form a display image corresponding to the image to be displayed.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, one or more groups of optical fiber detection devices are arranged on the inner side of the shell of the optical fiber scanning device, and the detection light source and the light detector in each group of optical fiber detection devices are oppositely arranged on two sides of the optical fiber cantilever; in the scanning process, the detection light source emits detection light, the optical detector generates corresponding electric signals according to the light received by the detection target surface of the optical detector to serve as detection signals to feed back, so that the optical fiber can shield the detection light emitted to the optical detector in the swinging process, the intensity of the detection light detected on the detection target surface of the optical detector is reduced, the waveform of the corresponding electric signals (voltage/current signals) can correspondingly change, and therefore the detection signals contain information representing that the optical fiber cantilever intermittently shields the detection light emitted to the optical detector by the detection light source in the scanning process and can serve as feedback information to realize detection of the movement gesture of the optical fiber in the optical fiber scanning device and improve the detection effect.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained, without inventive faculty, by a person skilled in the art from these drawings:
FIGS. 1A and 1B are schematic diagrams of a conventional optical fiber scanning projection system;
FIG. 2 is a schematic diagram of an optical fiber scanning device according to an embodiment of the present invention;
fig. 3A to 3C are schematic structural views of an optical fiber detection device disposed in an optical fiber scanning device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the variation of the electrical signal generated on the photodetector according to an embodiment of the invention;
FIGS. 5A-5D are schematic diagrams of elliptical motion trajectories and waveforms according to embodiments of the present invention;
FIG. 6 is a simplified schematic diagram of the scanning direction of an optical fiber in an embodiment of the invention;
FIGS. 7A-7B are diagrams illustrating slow axis amplitude control according to embodiments of the present invention;
fig. 8 is a flowchart of a scan detection method according to an embodiment of the invention.
Detailed Description
First, the term "and" in the embodiment of the present invention is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and B may be expressed as follows: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
When the present invention refers to ordinal numbers such as "first," "second," "third," or "fourth," it is to be understood as merely for distinction unless the order is actually expressed depending on the context.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 2 is a schematic structural diagram of an optical fiber scanning device according to an embodiment of the present invention. The fiber scanning device comprises a housing 10, an actuator 20 disposed within the housing, and an optical fiber, the portion of the optical fiber beyond the actuator 20 forming a fiber cantilever 30. At least one group of optical fiber detection devices 40 corresponding to the scanning direction of the optical fiber cantilever 30 are arranged on the optical fiber scanner, and each group of optical fiber detection devices 40 comprises a detection light source 41 and a light detector corresponding to the detection light source 42; the detecting light source 41 and the light detector 42 are oppositely arranged at two sides of the optical fiber cantilever 30; the light detector 42 is used for generating a corresponding electric signal as a detection signal to be fed back according to the detection light received by the detection target surface; during the initiation of the scanning of the fiber cantilever 30, the fiber cantilever 30 intermittently shields the probe light from the probe light source 41 to the photodetector 42.
In fig. 2, only one group of optical fiber detecting devices 40 corresponding to the optical fibers provided inside the housing 10 is shown, and the number of groups of the optical fiber detecting devices 40 may be increased according to actual situations when the optical fiber detecting device is implemented. In addition, the optical fiber scanning device provided by the embodiment of the application may further include other components, for example, an image light source, a lens (disposed in the housing 10) corresponding to the light emitting end of the optical fiber, and other components are not shown one by one.
The term "the probe light source 41 and the photodetector 42 in the optical fiber probe device 40 are disposed opposite to each other on both sides of the optical fiber" as used herein means that when the optical fiber moves in the moving direction, the probe light source 41 and the photodetector 42 included in the optical fiber probe device 40 corresponding to the moving direction are disposed opposite to each other on both sides of the moving direction of the optical fiber cantilever 30. Alternatively, it is also possible to consider that in each group of optical fiber detecting devices 40 corresponding to the moving direction, the detecting light source 41 and the photodetector 42 are located at both sides of the moving direction of the optical fiber, and the direction of the connecting line (without the actual connecting line) of the two is perpendicular to the moving direction of the optical fiber.
In the embodiment of the present application, the detection light source 41 may be a laser light source or other light sources such as a light emitting diode LED. Preferably, the probe light is collimated light, so a collimated light source may be used as the probe light source 41 or a collimating lens may be disposed at the exit end of the probe light source 41. The detection light may be visible light or invisible light, and even the detection light may have a specific wavelength, frequency, etc., which is not particularly limited in the present application, as long as the optical fiber cantilever 30 (or the opaque material coated on the cantilever) can be shielded. Photodetector 42 may be a charge coupled device (Charge coupled Device, CCD), which is a semiconductor device capable of converting an optical fiber image into an electrical signal, capable of storing and transmitting charge information.
The actuator 20 in the optical fiber scanning device may be a piezoelectric actuator, an electrostatic actuator, an electromagnetic actuator, a MEMS (Micro-Electro-Mechanical System ) actuator, or the like, and the actuator 20 is mainly described herein as a piezoelectric actuator.
The actuator 20 is capable of vibrating in multiple directions under a drive signal to drive the fiber cantilever 30 scanning the fiber for two-dimensional scanning. Specifically, the actuator 20 may include a first actuator 20 and a second actuator portion sequentially connected along an extending direction thereof, where under the action of a driving signal, the first actuator portion drives the second actuator portion to perform scanning in a first direction, the second actuator portion performs scanning in a second direction, and finally the actuator 20 drives the optical fiber cantilever 30 of the optical fiber to perform two-dimensional scanning in a combined direction of the first direction and the second direction, such as spiral scanning, raster scanning, lissajous scanning, and the like. Preferably, the first direction is the Y direction and the second direction is the X direction. Sweeping in a certain direction as referred to herein means that the actuator 20 moves the fiber in that direction to retrace.
The driving frequency of the first actuating portion in the actuator 20 is smaller than the driving frequency of the second actuating portion, i.e. the first actuating portion is a slow axis actuating portion and the second actuating portion is a fast axis actuator 20. In practical applications, the first actuating portion and the second actuating portion may be connected together by gluing, embedding and consolidation, adding a fixing structure, etc., or the actuator 20 may be integrally formed; the shape of the integrally formed actuator 20 may be sheet-like or cylindrical, or a combination of both, wherein the cylindrical shape includes cylindrical and Fang Zhuzhuang, such as round bar (tube), square bar (tube), etc., and the embodiment of the present invention is not limited thereto.
Referring still to fig. 1B, the optical fiber extends through the actuator 20 and at the free end of the actuator 20 to form a fiber cantilever 30 (i.e., the transmission fiber and the fiber cantilever 30 are integral); alternatively, the optical fiber is accessed from the a-side into the actuator 20 and closely docked with the B-side optical fiber cantilever 30 inside the actuator 20 so that a light beam can be output into the optical fiber cantilever 30 (i.e., the transmission fiber and the optical fiber cantilever 30 are not integral).
In the embodiment of the present invention, one or more groups of optical fiber detecting devices 40 corresponding to the movement direction (such as the X/Y direction) of the actuator 20 may be disposed on two sides of the optical fiber cantilever 30, where each pair of optical fiber detecting devices 40 includes a detecting light source 41 and a corresponding light detector 42, which is beneficial to detecting the movement gesture of the optical fiber in the corresponding movement direction.
If the actuator 20 of the optical fiber scanning device moves in the XY direction during the two-dimensional scanning, the optical fiber detecting device 40 may be provided in the X direction and/or the Y direction, respectively, so that the swing of the optical fiber in the Y direction and/or the X direction may be detected. In practical applications, one or more groups of optical fiber detecting devices 40 may be disposed in each XY direction, and the disposed optical fiber detectors may be directly fixed or fixed on the inner side of the housing 10 through corresponding connectors, etc., and other fixing manners may be adopted, as long as the disposed positions/angles of the components in the optical fiber detecting devices 40 correspond to the movement direction of the actuator 20. Of course, wiring of the optical fiber detecting device and the like may be provided on the housing 10, and the vacuum environment is provided in the housing 10, which helps to reduce interference of air with the swing of the optical fiber.
Preferably, a set of fiber optic detection devices 40 are provided in each of the two directions of movement of the actuator 20 for two-dimensional scanning. As shown in fig. 3A, the setting direction of the optical fiber scanning device is taken as the Z direction, the dotted line in the drawing is the starting position of the optical fiber cantilever 30, and a group of optical fiber detecting devices 40 (corresponding to the position when the optical fiber cantilever 30 is stationary) are respectively arranged in the X direction and the Y direction as an example; the first group of optical fiber detection devices corresponding to the X direction comprise a detection light source 411 and a light detector 412, which are respectively arranged at two sides of the optical fiber along the Y direction; the second group of optical fiber detectors corresponding to the Y direction includes a detection light source 421 and a light detector 422, which are disposed on both sides of the optical fiber in the Y direction, respectively.
If a plurality of sets of optical fiber detecting devices 40 corresponding to the X/Y direction are provided, the plurality of sets of optical fiber detecting devices 40 may be arranged in parallel along the extending direction of the optical fibers, and the emitting light direction of the detecting light source 41 may be directed to the Y/X direction, so that the arrangement position and the emitting light do not obstruct the swing of the optical fibers, as shown in fig. 3B. Alternatively, the plural sets of the optical fiber detecting devices 40 may be provided corresponding to the movement direction (in the X/Y direction) of the optical fiber cantilever 30, as long as the detected light sources 41 and the photodetectors 42 in each set are located on both sides (movement direction) of the optical fiber cantilever 30. As shown in fig. 3C, a front view of the optical fiber and the optical fiber detecting device 40 provided. In the figure, the actuator 20 drives the optical fiber cantilever 30 to move along the Y direction, and three groups of optical fiber detector devices 40 (i.e., the detection light sources A1, A2, A3 and the corresponding light detectors B1, B2, B3) corresponding to the Y direction are sequentially arranged along the Y direction.
Since the optical fiber performs simple harmonic motion in the motion direction, the speed of the optical fiber at the initial position of the optical fiber is the maximum, and the optical fiber at high speed can be considered to pass through the target surface of the detector at a uniform speed. The initial position refers to the position where the fiber is at rest. Therefore, in the embodiment of the present invention, when one or more sets of optical fiber detecting devices 40 corresponding to a certain movement direction are provided, it is preferable that one set of optical fiber detecting devices 40 be provided at the initial position of the optical fiber cantilever 30, that is, the position of the optical fiber in the static state or the center point of the optical fiber in the swinging state, so as to be beneficial to improving the detection accuracy. Still referring to fig. 3C, when the optical fiber cantilever 30 moves to the start position, the optical fiber cantilever 30 shields the detection light emitted from the detection light source A2, and the optical fiber cantilever 30 shields the detection light emitted from the detection light source 41 toward the detection target surface of the photodetector 42.
In the process of swinging the optical fiber, when the optical fiber does not shade the detection light emitted by the detection light source 41, the detection light directly irradiates on the detection target surface of the optical detector 42, and the detection target surface performs photoelectric conversion to generate a piezoelectric signal; when the optical fiber swings to the initial position, the detection target surface of the optical detector 42 is shielded, the voltage signal on the detection target surface in the optical detector 42 is reduced, and the voltage signal is recovered after the optical fiber leaves. Thus, during the scanning process, the movement of the optical fiber in the optical fiber scanner in the movement direction can be detected by the optical fiber detecting device 40.
Because of the small size of the detection target surface of photodetector 42, the speed of oscillation of the fiber is sufficiently fast that the fiber sweeps across the target surface at a nearly uniform speed. Thus, the position of the trough of the voltage signal can be considered as the moment when the optical fiber sweeps through the exact center of the detection target surface, as indicated by the broken line in fig. 4, from which the frequency and phase of the oscillation of the optical fiber can be determined.
Specifically, the trough width and depth of the signal formation will vary correspondingly as the fiber is swept across the target surface at different speeds during the scan. In the waveform map detected by the target surface of photodetector 42, the average speed (v) of the fiber across the target surface can be expressed as: v=t/D, where D represents the diameter of the fiber and T represents the trough width, i.e., the time the fiber is swept across the target surface. Thus, the area of the trough is proportional to the speed at which the fiber is swept across the target surface. Meanwhile, since the fiber vibration is a harmonic response, the speed (v) of the fiber passing midpoint is proportional to the amplitude (a), namely: a=f (v).
In practice, the shape of the waveform is related to the target surface shape size, the photodetector 42 and its corresponding detection circuit bandwidth. In one possible embodiment, the detection target size of photodetector 42 may be designed to be comparable to the fiber diameter size, and the target area may be slightly larger to achieve an optimal sensitivity and cost balance of sensors (photodetector 42). For example, when the target surface is matched to the fiber diameter size, the accuracy of the signal intensity detected by the photodetector 42 per unit time is high.
In another possible embodiment, the bandwidths corresponding to the photodetector 42 and the detection circuit may be designed according to the optical fiber wobble frequency, so that the bandwidths of the photodetector 42, i.e. the detection circuit, are matched with the scanning speed, thereby avoiding the defects of lower sensitivity and larger detection error of the photodetector 42 caused by too low bandwidth, and avoiding the increase of circuit cost caused by too high bandwidth.
In the embodiment of the present invention, the optical fiber scanning device is further provided with a processor, which is respectively connected with the optical detector 42 and the actuator 20, and is configured to determine, according to the detection signal fed back by the optical detector 42, whether the actual motion trajectory of the optical fiber cantilever 30 corresponds to the calibration motion trajectory, and correct the motion trajectory of the optical fiber when the actual motion trajectory of the optical fiber deviates from the calibration trajectory, so as to correct the motion trajectory of the optical fiber to be consistent with the calibration motion trajectory.
Because the optical fiber scanning device utilizes the actuator 20 to drive the optical fiber to vibrate at a high speed, and the display of image information is realized by matching with a laser modulation algorithm. In actual scanning, in order to realize the vibration of the maximum amplitude, the optical fiber works in a resonance mode, the scanning characteristics of the optical fiber in the resonance state are complex, and when the vibration amplitude of the optical fiber in a resonance area is larger due to the nonlinear effect of the vibration, the symmetry of the optical fiber, the symmetry of the scanner installation, the stability and other factors, the scanning track of the fast axis of the XY scanner is not an ideal horizontal straight line, the scanning track of the slow axis is not a vertical straight line but an inclined straight line, and when the swing amplitude is larger, the scanning tracks of the fast axis and the slow axis are both elliptical or circular, namely, the movement track of the optical fiber in the swing direction (XY direction) is elliptical due to the nonlinear effect.
Therefore, in the embodiment of the invention, when the processor corrects the motion trail of the optical fiber, the processor can detect whether the actual motion trail of the optical fiber is consistent with the calibrated motion trail based on the elliptical characteristic (phase/elliptical inclination).
At present, when detecting based on phase detection/elliptical inclination, the processor can detect the swing track of the optical fiber through the optical fiber detecting device 40 in the X/Y direction, so as to obtain a schematic diagram of the swing track of the optical fiber as shown in fig. 5A, and determine the signal waveform according to the detection signal detected by the optical fiber detecting device 40, as shown in fig. 5B, where the X-direction detection signal is a signal detected by the optical detector 41 arranged in the X direction, and the Y-direction detection signal is a signal detected by the optical detector 41 arranged in the Y direction. Further, the processor may calculate the vibration period of the optical fiber, i.e., t=2 (T C -t A )＝2*(t D -t B ) If t ba Equal to 1/4T, the movement track of the optical fiber is a standard ellipseOtherwise, the ellipse indicating the scan trajectory is slanted. If the ellipse is inclined, the processor can adjust the correction axis drive by using the phase difference as feedback data, so as to adjust the motion trail to be consistent with the nominal motion trail.
As shown in fig. 5C and 5D, when the optical fiber trajectory is aligned, the elliptical opening is reduced, the X-axis velocity of the BD two points is reduced, and the trough of the detection signal detected by the Y-direction photodetector 42 is widened. When the elliptical trajectory short axis width is less than the target size of photodetector 42, the signal is close to DC. Therefore, when the current motion track of the optical fiber is different from the calibration motion track through phase detection/elliptical inclination detection, the swinging vertical direction component can be removed through adjusting the scanning track to be in a straight line.
During the correction, it is necessary to remove the component of the vertical axis of the swing direction. Namely, when the slow axis swings along the Y axis, the swinging component in the X direction needs to be removed; and, when the fast axis swings in the X-axis direction, the swing component in the Y-axis direction needs to be removed. The following describes the correction of the fast and slow axes of the actuator 20, respectively:
1) Slow axis correction
In performing the slow axis correction, the optical fiber is scanned in the Y direction, including removal of the slow axis horizontal component (i.e., the displacement component generated in the X direction) and control of the slow axis amplitude. That is, when correcting the displacement component of the slow axis in the actuator 20, the amplitude of the slow axis needs to be compatible.
When the horizontal component of the slow axis is removed, the optical fiber detecting device 40 only needs to detect the projection of the optical fiber in the horizontal direction when swinging, that is, the detection and correction of the motion track of the slow axis can be realized through a group of optical fiber detecting devices 40 arranged in the X direction. The horizontal motion is the superposition of the fast axis horizontal motion component and the slow axis horizontal motion component, and can be expressed as:
H(t)＝Kx(t)+M'x(t)
Where Kx (t) represents the motion function of the fast axis in the horizontal direction and M' x (t) represents the component motion function of the slow axis in the horizontal direction.
That is, the signal detected by the optical fiber detecting device 40 corresponding to the Y direction contains only the motion information of the fast axis horizontal direction and the slow axis horizontal direction components. Therefore, the problem can be simplified and analyzed, and fig. 6 is a schematic diagram of simplifying the actual motion trajectory of the optical fiber during the swinging process to the motion trajectory of the optical fiber in the horizontal direction.
After simplification, the high-frequency swing component Kx (t) is taken as a main component, and the low-frequency swing component M 'x (t) slowly shifts the swing center left and right, so that the time interval between signal troughs is slightly changed, and the change speed is mainly related to the low-frequency swing component M' x (t). The speed at which the fiber sweeps across the Y-direction sensor also varies slightly with M' x (t) due to the slow drift of the center of oscillation. Therefore, the signal trough amplitude change f (amp) or the frequency phase change f (fp) is extracted through signal processing, so that the situation M' x (t) of the slow axis horizontal component motion can be reflected. By adjusting the scanner drive so that f (fp) or f (amp) is reduced to a certain range, it is possible to achieve approximate elimination of the swing component of the slow axis in the X-axis direction, i.e., to swing the slow axis into a straight line in the vertical direction.
In addition, in the slow axis amplitude control, the optical fiber detecting device 40 corresponding to the X direction only needs to detect the projection of the optical fiber in the swing horizontal direction. The vertical (Y-direction) motion is the superposition of the slow axis vertical motion and the fast axis vertical motion, and can be expressed as:
V(t)＝My(t)+K'y(t)
wherein My (t) represents the motion function of the slow axis in the vertical direction, and K' y (t) represents the component motion function of the fast axis in the vertical and horizontal directions.
That is, the signal detected by the Y-axis direction sensor contains only motion information of the components in the direction perpendicular to the slow axis and the direction perpendicular to the fast axis. Because the fast axis frequency is far higher than the slow axis frequency, the motion information in the vertical direction of the slow axis can be obtained by low-pass filtering the X-direction sensor signal Sx, namely the signal shown in the waveform diagram of FIG. 7A, and the amplitude of the signal is in direct proportion to the swing of the slow axis as shown in FIG. 7B; further, the processor may adjust the drive voltage of the actuator 20, correct the shaft voltage waveform, phase, etc., so that the motion component signal to be eliminated is reduced below the threshold value, and correct the motion trajectory of the optical fiber to substantially coincide with the nominal motion trajectory.
2) Quick axis correction
Similarly, in performing the fast axis correction, it is necessary to remove the fast axis vertical component, that is, the motion component generated in the Y direction by the fast axis. When the vertical component of the fast axis is removed, the optical fiber detecting device 40 only needs to detect the projection of the optical fiber in the vertical direction when swinging, namely, the detection and correction of the motion track of the fast axis can be realized through a group of optical fiber detecting devices 40 arranged in the Y direction.
In this process, the detection signal of the X-direction photodetector 42 is subjected to high-pass filtering to obtain a motion component of the fast axis in the vertical direction (Y-direction) when the fast axis moves near the X-axis sensor. Further, by adjusting the scanner driving signal so that the signal is reduced to a certain range, it is possible to achieve approximate elimination of the swing component of the fast axis in the Y-axis direction, that is, to swing the fast axis into a straight line in the horizontal direction.
On the other hand, when the fast axis vertical swing control is performed, after the slow axis swing is corrected (the slow axis horizontal swing component is removed), the amplitude of the signal trough detected by the Y-axis sensor is proportional to the speed of the fast axis swing sweeping the sensor target surface, and is proportional to the swing. In practical application, the amplitude of oscillation can be calculated by measuring the amplitude of the signal after calibration, so that the control of the fast axis vertical oscillation amplitude is realized, and the fast axis vertical oscillation amplitude can move according to the calibrated oscillation amplitude.
In the embodiment of the invention, the detection information corresponding to the detection light emitted to the photodetector 42 is shielded in the swinging process of the optical fiber, so that whether the optical fiber moves according to the calibrated motion trail is determined according to the fed-back detection information, the real-time detection of the motion gesture of the optical fiber in the optical fiber scanning device is realized, when the motion trail of the optical fiber is determined to deviate from the calibrated motion trail, the corresponding correction driving signal can be determined by comparing the specific parameters in the detection information with the calibrated specific parameters, the correction of the motion trail of the optical fiber to the calibrated motion trail is realized, and the reliability and the accuracy of optical fiber scanning are improved.
As shown in fig. 8, based on the same inventive concept, the embodiment of the present invention further provides a scanning detection method, which is applied to the optical fiber scanning device, and the structure and the setting method of the optical fiber detecting device refer to the foregoing description. The method comprises the following steps:
s11: in the optical fiber scanning process, a detection light source in the optical fiber detection device is controlled to emit detection light, and the detection light is emitted to a light detector on an emergent light path;
s12: generating a detection signal according to the detection light detected on the detection target surface of the light detector; the detection signal comprises information for representing that the optical fiber cantilever indirectly shields an emergent light path of the detection light in the scanning process;
s13: and feeding back the detection signal.
In the embodiment of the invention, one or more groups of optical fiber detection devices are arranged around the optical fibers in the optical fiber scanning device, and the detection light sources and the light detectors in each group of optical fiber detection devices are respectively positioned at two sides of the optical fiber cantilever, so that the optical fibers intermittently shield the transmission of detection light in the scanning process. Therefore, in the optical fiber scanning process, when the detection light source in the optical fiber detection device emits detection light to irradiate the target surface of the optical detector on the light emitting path of the detection light source, the optical fiber can shield the detection light irradiated to the optical detector in the swinging process, so that the intensity of the detection light detected on the detection target surface of the optical detector is reduced, the corresponding waveform of the voltage signal can change correspondingly, the detection signal contains information representing that the optical fiber cantilever intermittently shields the light emitting path of the detection light in the scanning process, and the information can be used as feedback information to realize real-time detection of the movement gesture of the optical fiber in the optical fiber scanning device and improve the scanning display effect.
Specifically, in S11, when the optical fiber scanning device is started to scan and display an image, the actuator in the optical fiber scanning device can drive the optical fiber to perform two-dimensional scanning, for example, scanning in the XY direction under the control of the driving signal. Meanwhile, the detection light source in the optical fiber detection device is controlled to continuously emit detection light, and the detection light can be emitted to the optical detector on the light emitting path. The probe light may be visible light or invisible light, and is not particularly limited herein. The photodetector may be a device such as a CCD that detects the optical power incident on its face and converts this change in optical power into a corresponding current/voltage signal.
The photodetector may generate a corresponding electrical signal (e.g., a current/voltage signal) based on the probe light impinging on the probe target surface. In S12, the optical detector may generate a corresponding detection signal according to the detection light detected on the detection target surface, where the detection signal includes information for characterizing that the optical fiber cantilever intermittently blocks the detection light during the swinging process. Therefore, after the detection information is fed back, the optical fiber scanning device can determine whether the current actual motion trail of the optical fiber cantilever is consistent with the calibration motion trail according to the detection information; and if the two motion trajectories are inconsistent, adjusting the driving signal of the optical fiber scanner to correct the motion trail of the optical fiber cantilever into the calibration motion trail, so as to avoid the distortion of the display image caused by the deviation of the motion trail of the optical fiber from the calibration motion trail.
Specifically, after S13, the optical fiber scanning device obtains the detection information fed back by the optical detector, and may determine the corresponding waveform diagram according to the detection information. The moment of weaker signal in the waveform diagram is the information when the optical fiber sweeps across the target surface, and the corresponding characteristic parameters such as time, amplitude, phase, frequency, signal pulse width and the like when the optical fiber sweeps across the target surface in the current actual motion trail can be determined according to the waveform diagram, namely, the information when the detected light sweeps across the target surface can be used as the characteristic parameters for representing the actual motion trail of the optical fiber. In the actual detection, the corresponding characteristic parameters can be selected and tested according to the actual requirements, and the specific limitation is not limited herein. And then whether the scanning track/direction of the optical fiber deviates from the calibrated scanning track/direction can be determined by comparing whether the corresponding calibration characteristic parameters in the calibrated motion track are consistent.
For example, after the characteristic parameters of the optical fiber moving in the X/Y direction are obtained according to the detection information, whether the time interval of the optical fiber scanning the center of the target surface is T/4 or not can be judged, wherein T is a calibrated scanning period; or whether the speed through the center of the target surface is the same as the nominal speed, etc. And if the at least one characteristic parameter representing the actual motion trail is judged to be inconsistent with the calibration motion trail, indicating that the swing direction of the optical fiber is deviated.
And the actual motion track of the optical fiber scanning device can be corrected according to the deviated motion track, so that the actuator drives the optical fiber to sweep according to the calibrated motion track.
In one embodiment, if the actuator drives the optical fiber to scan along the XY direction under the control of the driving signal, the optical fiber scanning device may determine the displacement of the optical fiber in the X/Y direction and the displacement component in the Y/X direction according to the difference between the at least one characteristic parameter and the at least one calibration characteristic parameter; then, determining a correction driving signal in the Y/X direction according to the displacement component; the correction driving information is used for controlling the actuator to drive the optical fiber to generate displacement opposite to the displacement component in the Y/X direction; and then, the correction driving signal is applied to the original driving signal of the actuator to drive the actuator, so that the actuator drives the optical fiber to scan according to the calibrated motion trail.
For example, the detected motion track of the optical fiber in the X/Y direction may be simplified into an elliptical track for correction, and the specific correction process refers to the correction process of the fast/slow axes, which is not described herein.
In order to enable those skilled in the art to better understand the technical solutions provided by the embodiments of the present invention, the near-eye display device provided by the embodiments of the present invention is illustrated in detail below.
Based on the same inventive concept, the embodiment of the invention also provides a scanning display device, which comprises a light source and an optical fiber scanning device connected with the light source, wherein the light source can be the light source of the laser set 110, the light source modulates and emits image light of an image to be displayed, and the image light is scanned and emitted by the optical fiber scanning device to form a display image corresponding to the image to be displayed, so that the display projection of the image to be displayed is realized. The foregoing embodiments of fig. 2 to fig. 7B are also applicable to the scanning display device of this embodiment, and by the foregoing detailed description of the optical fiber scanning apparatus, a person skilled in the art can clearly know the implementation of the scanning display device in this embodiment, which is not repeated herein for brevity of description.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, one or more groups of optical fiber detection devices are arranged on the inner side of the shell of the optical fiber scanning device, and the detection light source and the light detector in each group of optical fiber detection devices are oppositely arranged on two sides of the optical fiber cantilever; in the scanning process, the detection light source emits detection light, the optical detector generates corresponding electric signals according to the light received by the detection target surface of the optical detector to serve as detection signals to feed back, so that the optical fiber can shield the detection light emitted to the optical detector in the swinging process, the intensity of the detection light detected on the detection target surface of the optical detector is reduced, the waveform of the corresponding electric signals (voltage/current signals) can correspondingly change, and therefore the detection signals contain information representing that the optical fiber cantilever intermittently shields the detection light emitted to the optical detector by the detection light source in the scanning process and can serve as feedback information to realize detection of the movement gesture of the optical fiber in the optical fiber scanning device and improve the detection effect.
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (10)
1. The optical fiber scanning device comprises a shell, an actuator and an optical fiber, wherein the actuator and the optical fiber are arranged in the shell, the optical fiber is fixed on the actuator, the part of the light emitting end of the optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the actuator drives the optical fiber to perform two-dimensional scanning in space under the control of a driving signal.
And the processor is respectively connected with the optical detector and the actuator and is used for determining whether the actual movement track of the optical fiber cantilever is consistent with the calibration movement track according to the detection signals fed back by the optical detector, and if the actual movement track is determined to deviate from the calibration track, adjusting the driving signal of the actuator, and correcting the movement track of the optical fiber until the actual movement track is consistent with the calibration movement track.
2. The optical fiber scanning device according to claim 1, wherein the processor is further configured to adjust the scanning trajectory to be a straight line when it is determined that the motion trajectory of the optical fiber is different from the nominal motion trajectory by a phase or an elliptical inclination of the motion trajectory.
3. The optical fiber scanning device according to claim 1 or 2, wherein a diameter of a detection target surface of the photodetector is equal to or larger than a diameter of the optical fiber; and/or the bandwidths of the optical detector and the detection circuit correspond to the optical fiber swing frequency.
4. A fiber scanning device according to claim 3, wherein the actuator is controlled by the driving signal to drive the optical fibers to scan together in XY directions, and the outgoing light direction of the probe light source in the fiber detection device includes X direction and/or Y direction.
5. The optical fiber scanning device according to claim 4, wherein when a plurality of sets of optical fiber detecting devices are provided in one movement direction of the optical fiber, the plurality of sets of optical fiber detecting devices are provided in order along the movement direction or the extending direction of the optical fiber.
6. The optical fiber scanning device according to claim 5, wherein said optical fiber detector device is disposed at a position when said optical fiber is in a stationary state or at a center point when said optical fiber is swung.
7. A scanning detection method applied to the optical fiber scanning device according to any one of claims 1 to 6, characterized in that the method comprises:
in the optical fiber scanning process, controlling the detection light source to emit detection light, wherein the detection light is emitted to the light detector on the light emitting path;
generating a detection signal according to the detection light detected on the detection target surface of the light detector; the detection signal comprises information for representing that the optical fiber cantilever indirectly shields detection light emitted by the detection light source to the light detector in a scanning process;
feeding back the detection signal;
determining whether the current actual motion trail of the optical fiber cantilever is consistent with a calibration motion trail according to the detection signal;
And if the two are inconsistent, adjusting a driving signal of the actuator to correct the motion trail of the optical fiber cantilever to be the calibration motion trail.
8. The scan detection method according to claim 7, wherein said determining whether the current actual motion profile of the optical fiber cantilever is consistent with the nominal motion profile based on the detection signal comprises:
determining a waveform diagram corresponding to the detection signal;
determining at least one characteristic parameter representing the actual motion trail corresponding to the optical fiber according to the waveform diagram; wherein the at least one characteristic parameter comprises one or more of signal pulse width, amplitude, phase;
comparing the at least one characteristic parameter with at least one corresponding calibration characteristic parameter in the calibration motion trail to determine whether the at least one characteristic parameter and the corresponding calibration characteristic parameter are consistent;
determining whether the current actual motion trail of the optical fiber cantilever deviates from the calibrated motion trail according to the comparison result; and if the characteristic parameters are inconsistent with the calibration characteristic parameters, determining that the actual motion trail of the optical fiber deviates from the calibration motion trail.
9. The scan test method of claim 8, wherein adjusting the drive signal of the fiber scanner to correct the motion trajectory of the fiber cantilever to the calibration trajectory if the actuator is controlled by the drive signal to drive the fiber to scan in the XY direction, comprises:
Determining the displacement of the optical fiber in the X/Y direction and the displacement component in the Y/X direction according to the difference between the at least one characteristic parameter and the at least one calibration characteristic parameter;
determining a correction driving signal in the Y/X direction according to the displacement component; the correction driving information is used for controlling the actuator to drive the optical fiber to generate displacement opposite to the displacement component in the Y/X direction;
and driving the actuator by adopting the correction driving signal so that the actuator drives the optical fiber to scan according to the calibration motion trail.
10. A scanning display device, characterized by comprising a light source and an optical fiber scanning device according to any one of claims 1-6 connected with the light source, wherein the light source modulates and emits image light of an image to be displayed, and the image light is scanned and emitted by the optical fiber scanning device to form a display image corresponding to the image to be displayed.
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