Method for orienting and / or placing laser module of laser projector and virtual retina display with laser projector

Abstract

The invention relates to a method for orienting and / or positioning a laser module (10) of a laser projector (12) relative to at least one further laser module (20) of the laser projector (12), in which, in at least one method step (16), a laser beam (66) output by the laser module (10) is scanned by a micromirror (MEM, 18) over a region (24) comprising a target (22), in at least one method step (26), a further laser beam (68) output by the further laser module (20) is scanned by the same micromirror (18) over a further region (74) comprising the same target (22), and in at least one further method step (28), a further laser beam (68) output by the further laser module (20) is scanned over a further region (74) comprising the same target (22). A reflected signal (32) of the scanned laser beam (66) and a further reflected signal (34) of the further scanned laser beam (68) are detected on the basis of an operating parameter (36) of the micromirror (18), which operating parameter is detected or determined simultaneously with the respective reflected signal (32, 34), and wherein in at least one further method step (38), the reflected signal (32) of the scanned laser beam (66) and the further reflected signal (34) of the further scanned laser beam (68) are detected. Adjusting at least the orientation and / or position of the laser module (10) relative to the at least one further laser module (20) and / or at least the orientation and / or position of the at least one further laser module (20) relative to the laser module (10), a reflection of a reflected signal (32) of the laser beam (66) by the target (22) and a reflection of a further reflected signal (34) of the further laser beam (68) by the target (22) are detected with at least substantially consistent operating parameters (36) of the micromirror (18).

Description

BACKGROUND OF THE INVENTION

[0001] In some virtual retinal displays, it is necessary to introduce multiple laser sources into a laser projector, and the laser sources do not have the same optical path. Different, sometimes relatively expensive, methods have been proposed for introducing and orienting laser modules in a laser projector for a virtual retinal display. SUMMARY OF THE INVENTION

[0002] A method is proposed for orienting and / or placing a laser module of a laser projector, in particular a virtual retinal display (Retinal Scan Display), relative to at least one other laser module of the laser projector, wherein in at least one method step, a laser beam output by the laser module is scanned, in particular scanned over the entire surface, by a micromirror in a region including a target, and wherein in at least one method step, another laser beam output by another laser module is scanned, in particular scanned over the entire surface, by the same micromirror in another region including the same target, and wherein in at least one further method step, a reflection signal of the scanned laser beam, in particular a reflection signal reflected by the target, and another reflection signal of the scanned another laser beam, in particular another reflection signal reflected by the target, are detected based on operating parameters of the micromirror detected or derived simultaneously with the respective reflection signals, and wherein in at least one further method step, the orientation and / or position of at least the laser module relative to the at least one other laser module and / or the orientation and / or position of at least the at least one other laser module relative to the laser module are continuously adjusted, in particular by manually or automatically moving and / or rotating the laser modules relative to each other, until reflections of the reflection signal of the laser beam by the target and another reflection signal of the another laser beam by the target are detected under at least substantially consistent operating parameters of the micromirror. By the method according to the invention, advantageously, precise, robust, reliable and / or simple calibration of the laser modules of the laser projector relative to each other can be achieved. Advantageously, by using the same MEM and the same target, all laser modules of the laser projector, in particular all wavelengths of the laser projector, can be oriented and calibrated relative to each other. In particular, preferably different from camera-based solutions, high robustness can be achieved for different focal lengths, in particular the focal length of a single laser module. Furthermore, advantageously, orientation and / or placement can be achieved without adapting optical devices to a specific wavelength. In addition, advantageously, the size of the scanning area of the MEM can be arbitrarily changed without adjusting the equipment / sensors necessary for performing the method. Advantageously, the equipment / sensors necessary for performing the method do not need to be specifically oriented. Advantageously, the space required for the equipment / sensors necessary for performing the method can be kept relatively small.

[0003] In particular, the laser projector is configured as a laser projector for a virtual retinal display such as data glasses. In particular, the virtual retinal display is arranged to sequentially raster-scan at least one laser beam of at least one temporally modulated light source (such as one or more laser diodes of the laser projector) by deflection and directly image the image content onto the retina of the user's eye via an optical element. In particular, the laser projector is arranged to generate image data and output the image data via a visible laser beam. In particular, the laser projector has color (RGB) laser diodes for this purpose, and the color (RGB) laser diodes generate visible laser beams. Preferably, the color (RGB) laser diodes form the laser module of the laser projector. It is also conceivable that each laser color forms its own laser module of the laser projector. In particular, the laser projector is set up to output an invisible laser beam. In particular, the laser projector unit has an infrared laser diode that generates an invisible laser beam, preferably an infrared laser beam. Preferably, the infrared laser diode forms another laser module. Preferably, the infrared laser diode or the entire laser projector unit is configured as a ViP (VCSEL with integrated photodiode). In particular, the method is arranged to orient and / or position the infrared laser diode and the color (RGB) laser diodes relative to each other. A micromirror, i.e., a Micro Electromechanical Mirror (MEM), is in particular a mirror system that operates in a motorized manner and consists of one or more small movable mirrors, and the mirrors generate a scanned laser beam by movement. In particular, the MEM thus opens up an image plane, which is repeatedly raster-scanned by the laser beam and another beam of laser beams. In particular, the MEM produces a full-plane projection of the laser beam and another beam of laser beams here. Different reflected signals can be detected simultaneously or in successive traversals of the micromirror. For example, by alternately switching on different laser modules and / or different lasers of a laser module, each channel of the laser projector can be oriented relative to each other individually. In particular, the following regions are approximately the same size: the regions on which the MEM scans the laser beam over the entire plane.

[0004] In particular, the device for performing the method includes a control and / or regulation unit. The "control and / or regulation unit" should in particular be understood as a unit having at least one control electronic device. The "control electronic device" should in particular be understood as a unit having a processor, having a memory, and having a running program stored in the memory. In particular, the control and / or regulation unit is arranged to at least manipulate the MEM. In particular, the control and / or regulation unit is arranged to at least read out and / or detect one or more operating parameters of the MEM. The operating parameters can be configured as the instantaneous angular position of the MEM, the instantaneous movement position of the MEM, or the time signal of the MEM. The "arranged" and / or "set up" should in particular be understood as being specifically programmed, designed, and / or equipped. An object arranged to perform a determined function should in particular be understood as: the object satisfies and / or implements the determined function in at least one application state and / or operating state.

[0005] Advantageously, if the operating parameter is the time signal of the micromirror or the instantaneous position information of the micromirror, a simple and / or non-computationally intensive analysis of the operating parameter can be achieved. In particular, in a further method step, the orientation and / or position of the laser modules relative to each other are adjusted, and in the further method step, preferably by means of the information contained in the operating parameter, at least two images (such as an infrared image and a color image) of the target are brought into coincidence.

[0006] Furthermore, it is proposed that at least the reflection signal and / or at least the further reflection signal be detected by at least one 1D sensor, in particular by a photodiode. Thereby, advantageously, the method can be kept simple. Advantageously, the orientation of the 1D sensor is significantly simpler than the positioning of a 2D sensor (such as a camera). Alternatively, although in principle a 2D sensor, such as a camera, can also be considered. However, preferably, the sensor used in this method is different from a camera and is in particular structurally and / or technically simpler than a camera. Furthermore, advantageously, a cost-effective implementation can be achieved. Advantageously, in particular since the photodiode is a technically very simple and widely used component, a high degree of independence from supply chain problems can be achieved. It can be considered that the 1D sensor is arranged to simultaneously measure all wavelengths of all laser modules. In this case, the 1D sensor is configured as a broadband photodiode.

[0007] However, it has also been proposed that the reflected signal and additional reflected signals be detected by different 1D sensors, in particular by different, preferably narrowband, photodiodes having different sensitivity spectra, such as red photodiodes, green photodiodes, blue photodiodes, and infrared photodiodes. Advantageously, a cost-effective implementation can thereby be achieved. Advantageously, high precision can be achieved. Advantageously, the method can be carried out by means of a continuously activated laser module of a laser projector. Advantageously, the control of the individual laser diodes / laser modules of the laser projector can be dispensed with. For example, narrowband photodiodes of this type can be obtained by using laser-line filters that filter the light penetrating into the sensor of the photodiode for the reflected signal. Advantageously, a (small) spatial offset between different 1D sensors relative to one another does not affect the feasibility or the result of the method according to the invention.

[0008] As previously mentioned, if the reflected signal and additional reflected signals are detected by the same 1D sensor, in particular by the same photodiode having a wide sensitivity spectrum, then advantageously a particularly simple and / or cost-effective implementation of the device for carrying out the method can be achieved. In particular, in this case, the sensitivity spectrum of the 1D sensor extends from infrared to visible blue light.

[0009] It has also been proposed that one or more 1D sensors, in particular one or more photodiodes, be arranged (spatially) separately from and / or outside the laser projector. Thereby, advantageously, a simple construction of the device necessary for carrying out the method can be achieved. Advantageously, a plurality of laser projectors can be calibrated and / or oriented in a short time. Preferably, the 1D sensor is arranged at a distance from the laser projector.

[0010] Furthermore, it has been proposed that the target be constructed in an extended punctiform, linear manner or as a repeating pattern, such as a defined point cloud. Thereby, advantageously, in addition to planar orientation, scaling and / or rotational orientation can be achieved. The "extended point shape" should in particular be understood as a pattern shape that includes a plurality of identical or different points, all of which have a planar extension scale. In particular, the points in a defined point cloud are provided with different point extension scales, where preferably the respective relative size ratios and / or spacing ratios of the individual points are known. However, in general, all objects that reliably and preferably at least substantially equally reflect all wavelengths emitted by the laser module are suitable as targets.

[0011] The method can be advantageously implemented with particularly high precision if the target has an extension scale of at most 1 mm, preferably at most 0.5 mm, in at least one direction extending perpendicular to the (average) propagation direction of the laser beam and / or of a further laser beam and in particular parallel to the scanning direction of the micromirror. For example, the target can be configured as a reflective wire having a diameter of approximately 0.5 mm or less. However, in principle, larger targets can also be considered, the extension scale of which is approximately 1 mm, such as a model eye. In particular, however, the target needs to be large enough to generate a sufficiently high reflection signal. Preferably, the extension scale of the target in the direction extending perpendicular to the propagation direction of the laser beam and / or of a further laser beam and in particular parallel to the scanning direction of the micromirror is at least greater than 0.01 mm, preferably at least greater than 0.1 mm. In particular, the type of target also varies, since for example a wire or a glass rod can be more easily oriented due to its corresponding rotational symmetry than a 2D plate, which can tip over on at least one additional axis. A spherical lens can also be considered as a target.

[0012] If the laser beam and the further laser beam have different wavelengths, the orientation and / or placement of different components of the laser projector relative to one another can be achieved. Thereby, reliable functioning of the virtual retinal display and in particular of the data glasses having such a virtual retinal display can be ensured.

[0013] It is further proposed that there is at least one further second laser module which outputs a further second laser beam, and that the laser module is oriented and / or placed relative to the at least one further second laser module in the same way as it has already been oriented and / or placed relative to the further laser module, or that the at least one further second laser module is oriented and / or placed relative to the laser module and / or the further laser module in the same way as the laser module and the further laser module have already been oriented and / or placed relative to one another. Thereby, an advantageous calibration of the laser modules in a laser projector for a virtual retinal display can be achieved, in particular also when the color laser diodes of the laser projector are configured as different laser modules. In particular, the further second laser module emits a colored (visible) laser beam which has a different color (wavelength) from the colored (visible) laser beam emitted by the further laser module. The further second laser module can also be combined with the further laser module into a common higher-level laser module. However, preferably, the laser module (infrared light) is not combined with one of the further laser modules (visible light) of the further laser modules into a higher-level laser module in any case.

[0014] In addition, a laser projector is proposed, which has at least one laser module and at least one additional laser module, wherein at least one of the at least one additional laser module of the laser module and the additional laser module is oriented and / or placed relative to each other by means of the above method. Advantageously, a laser projector calibrated in an accurate, robust and / or reliable manner can thus be obtained.

[0015] In addition, a virtual retinal display, especially in data glasses, is proposed, which has a laser projector. Advantageously, high-quality data glasses enabling a variety of applications can thus be obtained. "Data glasses" should in particular be understood as wearable devices (head-mounted displays) by means of which information can be added to the user's field of vision. Preferably, the data glasses enable augmented reality applications and / or mixed reality applications. As is well known, data glasses are also referred to as smart glasses. In particular, the data glasses have a virtual retinal display, especially a virtual retinal display familiar to those skilled in the art (also referred to as a retinal scanning display or a light field display).

[0016] Additionally, an orientation device and / or placement device for performing the above method is proposed, which in particular has at least one first holding unit and at least one second holding unit. The at least one first holding unit is used to hold the target, the laser projector, the 1D sensor and the micromirror in a position-fixed manner. The 1D sensor is preferably a photodiode. The at least one second holding unit is used to hold the laser module and at least one additional laser module in a manner that enables the modification of the position and / or orientation. Advantageously, the reliable and / or simple execution of the method can thus be achieved, especially in a high-throughput manner.

[0017] Here, the method according to the invention, the laser projector according to the invention, the virtual retinal display according to the invention and the orientation device and / or placement device according to the invention should not be limited to the applications and embodiments described above. In particular, in order to implement the principle of action described here, the method according to the invention, the laser projector according to the invention, the virtual retinal display according to the invention and the orientation device and / or placement device according to the invention can have a number different from the number of the respective elements, components and units and method steps mentioned here. In addition, for the numerical ranges indicated in this disclosure, the values within the mentioned limits should also be considered as disclosed and can be used arbitrarily. Description of the Drawings

[0018] Other advantages result from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings, the description and the claims include a large number of feature combinations. A person skilled in the art will also purposefully observe the individual features and combine the features into other meaningful combinations.

[0019] The drawings show:

[0020] Figure 1 A schematic view of data glasses with a virtual retinal display having a laser projector

[0021] Figure 2 A schematic view of an orientation device and / or a placement device for performing an orientation and / or placement method that can be carried out before installing the laser projector in the data glasses.

[0022] Figure 3 Schematically shows the area covered by the full-surface scanning of the laser beams of the individual uncalibrated laser modules of the laser projector by means of micromirrors

[0023] Figure 4 Shows the reflected signal of a linear target for an orientation and / or placement method

[0024] Figure 5 Shows the reflected signal of a target of a structured defined point cloud for an orientation and / or placement method

[0025] Figure 6 Shows a schematic flow chart of an orientation and / or placement method that is at least used to orient and / or place the laser modules of the laser projector relative to other laser modules of the laser projector

[0026] Figure 7a Schematically shows the signal time curves of laser modules that are not calibrated relative to each other

[0027] Figure 7b Shows another signal time curve of laser modules that are calibrated relative to each other by means of an orientation and / or placement method. Detailed description

[0028] Figure 1Schematic diagram showing data glasses 52. The data glasses 52 have a virtual retinal display (retinal scanning display) 14. The data glasses 52 include a spectacle frame 60. The data glasses 52 include spectacle lenses 62. The virtual retinal display 14 is arranged to display image data by projecting into the user's eye 64 of the data glasses 52. The data glasses 52 have a laser projector 12. The virtual retinal display 14 has a laser projector 12. The laser projector 12 is configured as a scanning laser projector. The laser projector 12 is arranged to generate and output scanning laser beams 66, 68, 72. One or more of the scanning laser beams, such as scanning laser beams 66, 72, generate the image display of the data glasses 52. The other scanning laser beam 68 among the scanning laser beams may be arranged to determine the pupil position, pupil movement, pupil shape, and / or pupil size, etc. The laser beams 66, 72 and the other laser beam 68 have different wavelengths. The visible scanning laser beams 66, 72 include a visible component, which is arranged to output an image to the user's eye 64. The visible scanning laser beams 66, 72 are arranged to directly output the image display onto the retina of the user's eye 64. The other scanning laser beam 68 includes an infrared component, which is arranged to at least determine the pupil position, pupil movement, pupil shape, and / or pupil size of the user's eye 64. By steering the laser beams 66, 68, 72 in the direction of the user's eye 64 by means of optical elements (such as DOE or HOE) integrated in the spectacle lenses 62, the image data is brought onto the user's eye 64. The general configuration of the virtual retinal display 14 and its integration in the data glasses 52 are well known to those skilled in the art from their professional knowledge.

[0029] The laser projector 12 is at least partially integrated into the spectacle frame 60. The laser projector 12 has a laser module 10. The laser module 10 is arranged to output a (visible) laser beam 66. The laser projector 12 has a further laser module 20. The further laser module 20 is arranged to output a further (infrared) laser beam 68. The laser module 10 and the further laser module 20 are constructed separately from each other. The further laser beam 68 is coupled into the already existing laser beam 66 in the laser projector 12. The laser projector 12 has a further second laser module 30. Alternatively, the laser module 10 and the further second laser module 30 can also be combined in a common module. The further second laser module 30 is arranged to output a further second (visible) laser beam 72. The further laser beam 68 is coupled into the already existing further second laser beam 72 in the laser projector 12. Further additional laser modules can be considered. The laser projector 12 has a micromirror (MEM) 18. The micromirror 18 is arranged to scan the laser beams 66, 68, 72 across the entire surface. The data glasses 52 have a control and / or adjustment unit 70. Alternatively, the control and / or adjustment unit 70 can also be constructed separately from the data glasses 52 and can communicate with the data glasses 52 (for example as a cloud or an external smartphone, etc.). The control and / or adjustment unit 70 is arranged to at least control the laser projector 12. The control and / or adjustment unit 70 is arranged to execute the operating program of the data glasses 52, preferably by means of which at least a major part of the main functions of the data glasses 52 can be executed.

[0030] Figure 2 Schematically shown is an orientation device and / or placement device 54 for performing a method for orienting and / or placing the laser module 10 of the laser projector 12 and / or the further second laser module 30 of the laser projector 12 relative to the further laser module 20 of the laser projector 12 (see also Figure 6 ), which method can in particular be carried out before the laser projector 12 is mounted in the data glasses 52. The orientation device and / or placement device 54 has a first holding unit 56. The first holding unit 56 is arranged to hold the target 22, the (not yet mounted in the data glasses 52) laser projector 12, the 1D sensors 40, 42 and the micromirror 18 required for performing the method in a position-fixed manner. The orientation device and / or placement device 54 has a second holding unit 58. The second holding unit 58 is arranged to hold the laser module 10 and at least the further laser module 20 and / or at least the further second laser module 30 in a manner such that the position and / or orientation can be modified. The laser beams 66, 68, 72 have an average propagation direction 44.

[0031] The orientation device and / or placement device 54 has an optical sensor 78, which is arranged to detect the reflected signals 32, 34 of different laser beams 66, 68, 72. The optical sensor 78 is configured as 1D sensors 40, 42. The 1D sensors 40, 42 are configured as photodiodes. The 1D sensors 40, 42 are arranged separately from the laser projector 12. The 1D sensors 40, 42 are arranged outside the laser projector 12. In the example shown, the different reflected signals 32, 34 are detected by different, in particular wavelength-tuned, 1D sensors 40, 42. In this case, the 1D sensors 40, 42 are configured as photodiodes with different sensitivity spectra. However, it is also conceivable that the different reflected signals 32, 34 are detected by a single 1D sensor 40. Here, the 1D sensor 40 is configured as a photodiode with a wide sensitivity spectrum.

[0032] Figure 3 Regions 24, 74, 76 are schematically shown, which are covered by the full-surface scanning of the laser beams 66, 68, 72 (from the uncalibrated laser modules 10, 20, 30) by the micromirror 18. The laser beam 66 emitted by the laser module 10 is scanned over the first region 24. The further laser beam 68 emitted by the further laser module 20 is scanned over the second region 74. The further second laser beam 68 emitted by the further second laser module 30 is scanned over the third region 76. The further region indicated in Figure 3 can be the visible third laser beam from the RGB projection system. The micromirror 18 has a scanning direction 46. The target 22 has a maximum extension scale 50 of 1 mm in the direction 48 that is perpendicular to the propagation direction 44 of the laser beams 66, 68, 72 and parallel to the scanning direction 46 of the micromirror 18. Here, the target 22 can have different shapes. In Figure 3 , by way of example, the target 22 is shown circularly / extended dot-like (ausgedehnt ). In Figure 4 , by way of example, the target 22' is shown linearly extended / linearly in Figure 4 In the example of, the target 22’ is formed by a thin silk thread. In Figure 5 , the target 22” is configured as a repeating pattern / configured as a defined point cloud.

[0033] Figure 6 A flowchart of a method for orienting and / or placing the laser module 10 of the laser projector 12 relative to the further laser module 20 of the laser projector 12 is schematically shown. It should be noted that the laser module 10 can be oriented and / or placed relative to the further second laser module 30 or relative to any other laser module of the laser projector 12 in the same way as relative to the further laser module 20, and vice versa. In addition, it should be noted that inFigure 1 The laser modules 10, 20, 30 of the laser projector 12 of the virtual retinal display 14 shown in

[0034] In at least one method step 16, the laser beam 66 output by the laser module 10 is scanned across the entire area 24 including the target 22 by the micromirror 18. In at least one further method step 26, a further laser beam 68 output by a further laser module 20 is scanned across the entire area 74 including the same target 22 by the same micromirror 18. In at least one further method step 28, the reflected signal 32 of the scanned laser beam 66 and a further reflected signal 34 of the scanned further laser beam 68 are detected as a function of the operating parameter 36 of the micromirror 18 which is detected or determined simultaneously with the respective reflected signals 32, 34. In at least one further method step 38, the orientation and / or position of at least the laser module 10 relative to the further laser module 20 and / or the orientation and / or position of at least the further laser module 20 relative to the laser module 10 is continuously adjusted until, with at least substantially identical operating parameters 36 of the micromirror 18, the reflection of the reflected signal 32 of the laser beam 66 by the target 22 and the reflection of the further reflected signal 34 of the further laser beam 68 by the same target 22 are detected. In at least one further method step 80, the thus adjusted positions and orientations of the laser modules 10 and 20 are fixed relative to one another. In this calibrated state with the fixed laser modules 10, 20, the laser projector 12 can be installed in the virtual retinal display 14, preferably in the data glasses 52.

[0035] Figure 7a and Figure 7b respectively schematically show the same segment of the signal time curve 82, where time is plotted on the abscissa 84 and where the signal of the optical sensor 78 during a single traversal of the respective areas 24, 74 by the scanned laser beams 66, 68 in the scanning direction 46 is plotted on the ordinate 86, the optical sensor being in particular a 1D sensor 40 / multiple 1D sensors 40, 42 in one of the two areas 24, 74. The micromirror 18 has an operating parameter 36. The operating parameter 36 can be the time signal 88 of the micromirror 18 or the instantaneous position information of the micromirror 18. In the case shown, the operating parameter 36 corresponds to the following time signal 88: when the target 22 appears in the signal of the optical sensor 78, the optical sensor being in particular a 1D sensor 40 / multiple 1D sensors 40, 42 in one of the two areas 24, 74. In Figure 7aThe state in which the laser modules 10, 20 are not yet calibrated relative to each other is shown. The time signal 88 assigned to the laser module 10 of the micromirror 18 is registered at a position on the abscissa 84 that is different from the time signal 88' assigned to the other laser module 20. That is, the laser beams 66, 68 of the two laser modules 10, 20 scan the target 22 at different positions in the scanned regions 24, 74 of the laser modules 10, 20. By moving or pivoting the laser modules 10, 20 relative to each other, the time signals 88, 88' are iteratively overlapped. Figure 7b The (at least along the scanning direction 46) calibrated state of the laser modules 10, 20 relative to each other is shown after performing the above method.

[0036] In the proposed method, it is utilized that individual 1D sensors 40, 42 (i.e., for example, individual photodiodes) only record individual signals that change over time, rather than creating a spatial (two-dimensional) image like a camera. Then, in order to obtain a spatial signal again from the time signals 88, 88' that are independent of space of the 1D sensors 40, 42, the time signals 88, 88' can be assigned to the instantaneous mirror positions of the micromirror 18. However, in principle this is not possible, and the superposition of the time signals 88, 88' is already sufficient to orient the laser modules 10, 20, in particular to overlap the regions 24, 74.

Claims

1. A method for orienting and / or positioning a laser module (10) of a laser projector (12) relative to at least one further laser module (20) of the laser projector (12), in particular a virtual retinal display (RetinalScan Display, 14), wherein, in at least one method step (16), a laser beam (66) output by the laser module (10) is scanned, in particular scanned over the entire surface, by a micromirror (MEM, 18) over an area (24) including a target (22), wherein, in at least one method step (26), a further laser beam (68) output by the further laser module (20) is scanned, in particular scanned over the entire surface, by the same micromirror (18) over a further area (74) including the same target (22), wherein, in at least one further method step (28), a reflection signal (32) of the scanned laser beam (66) and a further reflection signal (34) of the scanned further laser beam (68) are detected based on operating parameters (36) of the micromirror (18) that are detected or derived simultaneously with the respective reflection signals (32, 34), wherein, in at least one further method step (38), the orientation and / or position of at least the laser module (10) relative to the at least one further laser module (20) and / or the orientation and / or position of at least the at least one further laser module (20) relative to the laser module (10) are continuously adjusted until, with at least substantially identical operating parameters (36) of the micromirror (18), a reflection of the reflection signal (32) of the laser beam (66) by the target (22) and a reflection of the further reflection signal (34) of the further laser beam (68) by the target (22) are detected.

2. The method according to claim 1, characterized in that, the operating parameters (36) are time signals (88, 88') of the micromirror (18) or instantaneous position information of the micromirror (18).

3. The method according to claim 1 or 2, characterized in that, at least the reflection signal (32) and / or at least the further reflection signal (34) are detected by at least one 1D sensor (40), in particular by a photodiode.

4. The method according to claim 3, characterized in that, the reflection signal (32) and the further reflection signal (34) are detected by different 1D sensors (40, 42), in particular by different photodiodes having different sensitivity spectra.

5. The method according to claim 3, characterized in that, the reflection signal (32) and the further reflection signal (34) are detected by the same 1D sensor (40), in particular by the same photodiode having a wide sensitivity spectrum.

6. The method according to any one of claims 3 to 5, characterized in that, One or more 1D sensors (40, 42), in particular one or more photodiodes, are arranged separately from the laser projector (12), and / or one or more 1D sensors (40, 42), in particular one or more photodiodes, are arranged outside the laser projector (12).

7. The method according to any one of the preceding claims, characterized in that the target (22) is extended in a dot-like, line-like manner or is configured as a repeating pattern, such as a defined point cloud.

8. The method according to any one of the preceding claims, characterized in that the target (22) has an extension scale (50) of at most 1 mm, preferably at most 0.5 mm, in at least one direction (48) extending perpendicular to the propagation direction (44) of the laser beam (66) and / or the further laser beam (68) and in particular parallel to the scanning direction (46) of the micromirror (18).

9. The method according to any one of the preceding claims, characterized in that the laser beam (66) and the further laser beam (68) have different wavelengths.

10. The method according to any one of the preceding claims, characterized in that at least one further second laser module (30) which outputs a further second laser beam (72), the laser module (10) being oriented and / or positioned relative to the at least one further second laser module in the same way as it has already been oriented and / or positioned relative to the further laser module (20), or the at least one further second laser module being oriented and / or positioned relative to the laser module (10) and / or the further laser module (20) in the same way as the laser module (10) and the further laser module (20) have already been oriented and / or positioned relative to each other.

11. A laser projector (12) having at least one laser module (10) and having at least one further laser module (20), characterized in that at least the laser module (10) and the further laser module (20) are oriented and / or positioned relative to each other by means of the method according to any one of the preceding claims.

12. A virtual retinal display (14), in particular a virtual retinal display (14) in data glasses (52), having the laser projector (12) according to claim 11.

13. A positioning device and / or placement device (54) for performing the method according to any one of claims 1 to 10, the positioning device and / or placement device in particular having at least one first holding unit (56) and having at least one second holding unit (58), the at least one first holding unit for holding the target (22), the laser projector (12), the 1D sensors (40, 42) and the micromirror (18) in a position-fixed manner, the 1D sensors preferably being photodiodes, the at least one second holding unit for holding the laser module (10) and at least one further laser module (20) in a position-modifiable manner and / or orientation-modifiable manner.

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