Apparatus and method for integrating a sensor system of an eye-tracking device into a waveguide, in particular for smart glasses
The integration of a sensor system into a waveguide using a laser beam with visible and non-visible rays in data glasses addresses inefficiencies by reducing space and costs, improving gaze detection accuracy through wavelength selectivity and stereoscopic modeling.
Patent Information
- Application Number
- PCT/EP2025/052133
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-04-12
- Filing Date
- 2025-01-28
- Publication Date
- 2025-10-16
AI Technical Summary
Existing gaze detection devices in data glasses are inefficient and require additional structures to guide laser beams, leading to increased space and manufacturing costs, while also being less effective in determining gaze vectors due to stray light interference.
A method and device integrating a sensor system into a waveguide using a laser beam with visible and non-visible rays, where the beam is coupled, expanded, and decoupled efficiently, allowing for a compact design and improved gaze detection by using wavelength selectivity and overlapping projection and functional paths, with structures like reflection and transmission holograms guiding scattered light to a detector.
This approach reduces space and manufacturing costs, enhances gaze detection accuracy by minimizing stray light interference, and allows for a more robust and efficient determination of gaze vectors using stereoscopic modeling.
Smart Images
Figure EP2025052133_16102025_PF_FP_ABST
Abstract
Description
[0001] Description
[0002] title
[0003] Device and method for integrating a sensor system of a gaze detection device into a waveguide, in particular for data glasses
[0004] State of the art
[0005] The invention relates to a device and a method for integrating at least part of a gaze detection device, in particular a sensor system of the gaze detection device, into a waveguide. The waveguide is, in particular, part of a pair of data glasses.
[0006] A key component for the reliable functioning of smart glasses is determining the gaze direction of a user, for example, in the form of a gaze vector. This determination is carried out, for example, by a gaze detection device, which may comprise a sensor system that captures an image, particularly one specifically illuminated, of the user's eye.
[0007] Accordingly, data glasses are desirable that enable reliable detection of the user's eye and a high-quality display of an image to be shown to the user, while being cost-effective and comfortable for the user to use.
[0008] Disclosure of the invention
[0009] Problems of the prior art are solved by a method, a device, and data glasses according to one of the independent claims. The device, in particular for data glasses, comprises: an illumination device comprising at least one laser light source for visible light, for example an RGB laser light source, and a laser source for non-visible rays, for example an infrared laser source, and wherein the illumination device is designed to generate a laser beam comprising visible light and non-visible rays, and is designed to emit the laser beam in an emission direction that is variable in at least one spatial dimension, in particular in two spatial dimensions; and a waveguide comprising: at least one coupling structure designed to couple the laser beam emitted in the emission direction into the waveguide;at least one first expansion structure configured to expand the coupled laser beam in a first dimension into a first plurality of images of the laser beam; at least one coupling-out structure configured to couple a second plurality of images of the laser beam out of the waveguide and, in particular, to radiate them in a direction of a user's eye, wherein the coupling-out structure is configured to couple images of the laser beam of the second plurality of images in a coupling-out direction, depending on the radiation direction of the laser beam;wherein the waveguide is designed to couple out a single image in the coupling direction dependent on the emission direction of the laser beam, in particular in the direction of the eye, for a specific wavelength range of the laser beam, in particular a specific wavelength of the laser beam, in particular of rays not visible to the user, for example a wavelength or a wavelength range of infrared rays;
[0010] By coupling out only a single image of the laser beam for the specific wavelength range, it appears as if the eye is illuminated by a point beam source with this wavelength range. Images of the eye illuminated by this point light source can be used for applications such as modeling the eye and / or determining a gaze vector. For the remaining wavelength range of the laser beam, for example the wavelength range for visible light, the second plurality of images of the laser beam are coupled out, providing the user with a larger eyebox or a larger field of view in which to perceive an image generated by the illumination device using the laser beam. The device thus allows for a compact and space-saving design of the waveguide, which can nevertheless implement all the functions of data glasses.
[0011] The path through the waveguide taken by the visible light from the laser light source to the output coupling structure can also be referred to as the projection path. This part of the laser beam from the illumination device creates the image; therefore, the illumination device and the laser light source can also be referred to as a projector.
[0012] The path followed by the invisible rays of the laser source in the waveguide until they are coupled out can be called the functional path, since the invisible rays are used to implement functions for the data glasses, for example to determine the gaze vector or the model of the eye.
[0013] An advantageous example is characterized in that the decoupling structure of the waveguide is designed to decouple the individual image of the laser beam from the second plurality of images of the laser beam for the specific wavelength range of the laser beam, in the decoupling direction dependent on the emission direction of the laser beam.
[0014] This eliminates the need for additional structures in the waveguide to guide the laser beam to the output coupling structure; instead, the same structures and paths are used. The projection path and the functional path overlap at least partially, reducing the space required and manufacturing effort of the waveguide.
[0015] An advantageous example is characterized in that the device comprises a detector, in particular a photodiode, wherein the waveguide comprises at least one collecting structure, in particular a plurality of collecting structures, which is designed to guide scattered light, in particular scattered light of the eye, via an imaging path to the detector.
[0016] The collection structure increases design flexibility regarding the detector's mounting location. For example, the detector can be placed outside the eye's field of view. Furthermore, the waveguide is typically positioned in a viewing direction of the eye, allowing the output coupling structure to output the second plurality of images of the laser beam toward the eye. Accordingly, the collection structure is also positioned optimally for collecting scattered light from the eye, improving detection of the eye by the detector while remaining independent of the detector's location.
[0017] Preferably, the at least one collecting structure is designed to guide the scattered light of a specific wavelength range or a specific wavelength, in particular a wavelength range or a wavelength of the laser source of the illumination device, to the detector.
[0018] Thanks to wavelength selectivity, only those rays relevant to the functions of the data glasses, such as determining the gaze vector or the eye model, reach the detector. This improves robustness, especially against stray light.
[0019] Preferably, the coupling-out structure forms the at least one collection structure and the waveguide at least partially encompasses the imaging path, wherein the at least one collection structure guides the scattered light to the detector.
[0020] This reduces the number of separate structures in the waveguide, thereby reducing space requirements and reducing manufacturing costs for the waveguide.
[0021] Preferably, the at least one collection structure, in particular as a reflection hologram, is designed to reflect the scattered light to the detector.
[0022] Reflective structures, especially reflection holograms, are low in complexity, and the imaging path does not need to be integrated into the waveguide, thus reducing the manufacturing costs of the waveguide. Preferably, the waveguide comprises the detector, and the at least one collection structure, especially a transmission hologram, is designed to image the scattered light onto the detector.
[0023] Transmission holograms are low-complexity and inexpensive to manufacture. Furthermore, the detector is fixedly positioned within the waveguide relative to the collection structure, improving the quality of the image onto the detector. Furthermore, the imaging path is short and simple, reducing the manufacturing costs of the waveguide.
[0024] The waveguide may comprise at least one second expansion structure configured to expand the first plurality of images in a second dimension into a second plurality of images of the laser beam.
[0025] Preferably, the at least one coupling structure comprises at least a first part and at least a second part, wherein the at least one first part is designed to couple a laser beam emitted in at least a first specific region of the emission direction into the waveguide and the at least one second part is designed to couple a laser beam emitted in at least a second specific region of the emission direction into the waveguide;the at least one first expansion structure has at least a first part and at least a second part, wherein the at least one first part of the first expansion structure is designed to expand the laser beam coupled in by the at least one first part of the coupling structure into at least a first part of the first plurality of images in the first dimension and the at least one second part of the first expansion structure is designed to expand the laser beam coupled in by the at least one first second part of the coupling structure into at least a second part of the first plurality of images in the first dimension;the at least one second expansion structure has at least a first part and at least a second part, wherein the at least one first part of the second expansion structure is designed to expand the at least one first part of the first plurality of images into at least a first part of the second plurality of images in the second dimension and the at least one second part of the second expansion structure is designed to expand the at least one second part of the first plurality of images into at least a second part of the second plurality of images in the second dimension;the at least one coupling-out structure has at least a first part and at least a second part, wherein the at least one first part of the coupling-out structure is designed to couple the at least one first part of the second plurality of images out of the waveguide, in particular in the direction of the eye, and the at least one second part of the coupling-out structure is designed to couple the at least one second part of the second plurality of images out of the waveguide, in particular in the direction of the eye;
[0026] Preferably, the at least one first part of the coupling-out structure is designed to couple out the individual image from the at least one first part of the second plurality of images for the at least one first specific region of the emission direction, in the coupling-out direction dependent on the emission direction of the laser beam, and the at least one second part of the coupling-out structure is designed to couple out the individual image from the at least one second part of the second plurality of images for the at least one second specific region of the emission direction, in the coupling-out direction dependent on the emission direction of the laser beam, wherein the at least one first part of the coupling-out structure and the at least one second part of the coupling-out structure are spatially offset.
[0027] This allows the eye to be illuminated from different perspectives with the invisible rays of the laser beam, depending on the direction of radiation. Using stereoscopic or stereo construction algorithms, it is possible to model the pupil of the eye in space. This improves the determination of the eye's gaze vector.
[0028] Preferably, the illumination device comprises at least one beam deflection device, in particular a prism, which is designed to fold a beam of the laser source into a beam of the at least one laser light source.
[0029] Thus, the laser beam, which comprises visible light and non-visible rays, is provided efficiently. Preferably, the illumination device comprises a module that includes the laser source and the at least one laser light source, as well as a first waveguide for the laser source and at least one second waveguide for the at least one laser light source, and an exit section, in particular an exit lens, wherein the exit section is configured to combine the first waveguide and the at least one second waveguide.
[0030] Thus, the laser beam, which includes visible light and non-visible rays, is generated efficiently and the lighting device is compact and space-saving.
[0031] The illumination device preferably comprises a deflection device, in particular a tilting mirror in the form of a micro-electro-mechanical system mirror, which is designed to direct the laser beam in the emission direction by means of at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle, wherein the deflection device is designed in particular to scan the at least one coupling structure and the eye in a pattern, in particular a line-shaped or column-shaped pattern.
[0032] The deflection device enables the illumination device to efficiently and flexibly deflect the laser beam in the beam direction using the deflection angles. Furthermore, quantitative determination of the beam direction is possible via the deflection angles. This allows, for example, the determination of the gaze vector or an estimation of the eye model to be implemented simply and efficiently.
[0033] The method, in particular for data glasses, comprises: generating a laser beam comprising visible light and infrared rays by means of an illumination device comprising at least one laser light source for visible light, for example an RGB laser light source, and a laser source for non-visible rays; emitting the laser beam in an emission direction that is variable in at least one spatial dimension, in particular in two spatial dimensions; coupling the laser beam emitted in the emission direction into a waveguide by means of at least one coupling structure encompassed by the waveguide; expanding the coupled laser beam in a first dimension into a first plurality of images of the laser beam by means of at least one first expansion structure;Expanding the first plurality of images of the laser beam in a second dimension into a second plurality of images of the laser beam by means of at least one second expansion structure; decoupling and, in particular, emitting the second plurality of images of the laser beam from the waveguide in the direction of a user's eye by means of an outcoupling structure, wherein images of the second plurality of images of the laser beam are coupled out in an outcoupling direction depending on the emission direction of the laser beam;wherein, by means of the waveguide, for a specific wavelength range of the laser beam, in particular a specific wavelength of the laser beam, in particular of rays not visible to the user, for example a wavelength or a wavelength range of infrared rays, a single image is coupled out in the coupling-out direction dependent on the radiation direction of the laser beam and is emitted in particular in the direction of the eye;
[0034] Preferably, by means of the coupling-out structure of the waveguide, for the specific wavelength range of the laser beam, the individual image of the laser beam is coupled out from the second plurality of images of the laser beam in the coupling-out direction dependent on the emission direction of the laser beam.
[0035] Preferably, the method comprises guiding scattered light, in particular scattered light from the eye, via an imaging path to a detector, in particular a photodiode, by means of at least one collection structure, in particular a plurality of collection structures, which the waveguide comprises.
[0036] Preferably, the method comprises guiding the scattered light, wherein the scattered light of a specific wavelength range or a specific wavelength, in particular a wavelength range or a wavelength of the laser source of the illumination device, is guided to the detector by means of the at least one collecting structure.
[0037] Preferably, the at least one collection structure is encompassed by the coupling-out structure and the imaging path is at least partially encompassed by the waveguide, wherein the scattered light is guided to the detector by means of the at least one collection structure.
[0038] Preferably, the scattered light is reflected to the detector by means of the at least one collecting structure, in particular a reflection hologram.
[0039] Preferably, the detector is encompassed by the waveguide and the scattered light is imaged onto the detector by means of the at least one collection structure, in particular a transmission hologram.
[0040] The method preferably comprises coupling a laser beam emitted in at least a first specific region of the emission direction into the waveguide by means of at least one first part comprised by the at least one coupling structure; coupling a laser beam emitted in at least a second specific region of the emission direction into the waveguide by means of at least one second part comprised by the at least one coupling structure; expanding the laser beam coupled in by the at least one first part of the coupling structure into at least a first part of the first plurality of images in the first dimension by means of at least one first part comprised by the at least one first expansion structure;expanding the laser beam coupled in by the at least one second part of the coupling structure into at least a second part of the first plurality of images in the first dimension by means of at least one second part comprised by the at least one first expansion structure; expanding the at least one first part of the first plurality of images into at least a first part of the second plurality of images in the second dimension by means of at least one first part comprised by the at least one second expansion structure; expanding the at least one second part of the first plurality of images into at least a second part of the second plurality of images in the second dimension by means of at least one second part comprised by the at least one second expansion structure;Coupling out the at least one first part of the second plurality of images from the waveguide, wherein this is emitted in particular in the direction of the eye, by means of at least one first part comprised by the at least one coupling-out structure; Coupling out the at least one second part of the second plurality of images from the waveguide, wherein this is emitted in particular in the direction of the eye, by means of at least one second part comprised by the at least one coupling-out structure.
[0041] The method preferably comprises decoupling the individual image of the laser beam for the at least one first specific region of the emission direction from the at least one first part of the second plurality of images, in the decoupling direction dependent on the emission direction of the laser beam, by means of the at least one first part of the decoupling structure; decoupling the individual image of the laser beam for the second specific region of the emission direction from the at least one second part of the second plurality of images, in the decoupling direction dependent on the emission direction of the laser beam, by means of the at least one second part of the decoupling structure; wherein the at least one first part of the decoupling structure and the at least one second part of the decoupling structure are spatially offset.
[0042] Preferably, a beam of the laser source is folded into a beam of the laser light source by means of a beam deflection device, in particular a prism, comprised by the illumination device.
[0043] Preferably, the laser source and the at least one laser light source are comprised by a module comprised by the illumination device, wherein a first waveguide for the laser source and at least one second waveguide for the laser light source and an exit section are comprised by the module and the first waveguide and the at least one second waveguide are brought together by means of the exit section.
[0044] The method preferably comprises directing the laser beam through at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle in the emission direction by means of a deflection device included in the illumination device, in particular a tilting mirror in the form of a micro-electro-mechanical system mirror; and scanning the at least one coupling structure and the eye, in particular in a line-shaped or column-shaped pattern, by means of the deflection device.
[0045] The data glasses comprise the device according to the above embodiments, wherein the waveguide is arranged in a lens of the data glasses.
[0046] Preferably, the detector is integrated into the lens or the waveguide.
[0047] Preferably, the detector is arranged outside the spectacle lens on the data glasses, in particular on a spectacle frame or temple of the data glasses.
[0048] Further advantageous embodiments are apparent from the drawing and the following description. The drawing shows:
[0049] Figure 1a is a schematic representation of a device according to exemplary embodiments;
[0050] Figure 1b is a schematic representation of a side view of the device;
[0051] Figure 2a is a schematic representation of an embodiment of the device
[0052] Figure 2b is a schematic representation of a partial section of the embodiment;
[0053] Figure 2c is a schematic representation of an embodiment of the device;
[0054] Figure 3a is a schematic representation of an embodiment of the device;
[0055] Figure 3b is a schematic representation of a side view of the embodiment of the device; Figure 4a is a schematic representation of an illumination device of the device;
[0056] Figure 4b is a schematic representation of an embodiment of the lighting device;
[0057] Figure 4c is a schematic representation of an embodiment of the lighting device;
[0058] Figure 5a shows a flowchart of a method according to exemplary embodiments;
[0059] Figure 5b Process steps of an embodiment of the process;
[0060] Figure 5c Process steps of an embodiment of the process;
[0061] Figure 5d Process steps of an embodiment of the process.
[0062] Figure 1a shows a device 100, in particular for data glasses 400, comprising an illumination device 200 that includes at least one laser light source 202 for visible light, for example, an RGB laser light source 202, and a laser source 204 for non-visible rays, for example, an infrared laser source 204. The illumination device 200 is configured to generate a laser beam 206 that includes visible light and non-visible rays. Furthermore, the illumination device 200 is configured to emit the laser beam 206 in an emission direction 102 that is variable in at least one spatial dimension, in particular in two spatial dimensions.
[0063] The device 100 further comprises a waveguide 300, which comprises at least one coupling structure 302, which is designed to couple the laser beam 206 emitted in the emission direction 106 into the waveguide 300. The coupling structure 302 is, for example, a structure on a surface of the waveguide 300, which comprises a two-dimensional coupling surface and guides the laser beam 206 to internal structures of the waveguide 300. The waveguide 300 comprises at least one first expansion structure 304, which is designed to expand the coupled laser beam 206 in a first dimension into a first plurality 310 of images 208 of the laser beam 206. The first expansion structure 304 expands the laser beam 206, for example, in a horizontal or vertical direction. The first expansion structure 304 may be configured as a 90° deflector that expands the laser beam 206 in the first dimension and deflects it by a 90° angle.
[0064] The waveguide 300 comprises at least one second expansion structure 306, which is designed to expand the first plurality 310 of images 208 in a second dimension into a second plurality 312 of images 208 of the laser beam 206. This creates a two-dimensional, spatially extended field of images 208 of the laser beam 206. The second expansion structure 306 expands, for example, the laser beam 206, which has been expanded in the vertical or horizontal direction into the first plurality 310 of images 208, in the horizontal or vertical direction into the second plurality 312 of images 208 of the laser beam 206. The second expansion structure 306 can be designed, for example, as a 90° deflector.
[0065] The waveguide 300 comprises at least one coupling-out structure 308, which is designed to couple the second plurality 312 of images 208 of the laser beam 206 out of the waveguide 300 and, in particular, to emit them in a direction of an eye 2 of a user. The coupling-out structure 308 is designed to couple images 208 of the laser beam 206 of the second plurality 312 of images 208 in an output direction 104 depending on the emission direction 102 of the laser beam 204. In the example, the illumination device 100 generates an image to be displayed for the user using the laser beam 206, in particular using the visible light of the laser beam 206, and the variable emission direction 102. This image comprises, for example, content relevant to the user. The second plurality 312 of images 208 therefore comprises a corresponding number of images of the image to be displayed.Due to the two-dimensional spatial extension of the field, in the form of the second plurality 312 of images 208, an eyebox is created that is visible to the user and within which the user can perceive the image to be displayed.
[0066] The waveguide 300 is designed to couple out a single image 210 for a specific wavelength range of the laser beam 206, in particular a specific wavelength of the laser beam 206, in particular of rays invisible to the user, for example a wavelength or a wavelength range of infrared rays, in the coupling direction 104 dependent on the emission direction 102 of the laser beam 206, and to emit it in particular in the direction of the eye 2. By means of this single image 210, the eye 2 is illuminated with the invisible rays of the laser beam 206, for example in the form of infrared laser beams, from a point light source. Depending on the emission direction 102 of the laser beam 206, a different point on the eye 2 is illuminated. This illuminated point can be used, for example, to determine a viewing direction of the eye 2 in the form of a gaze vector.
[0067] A path used by the visible light of laser beam 206 in waveguide 300 can be referred to as a projection path. A path of the non-visible rays of laser beam 206 in waveguide 300 can be referred to as a functional path. Provision can be made for the projection path and the functional path to run separately from one another. Alternatively, the projection path and the functional path can overlap at least partially in waveguide 300, in particular in the form of a multiplex hologram. It is conceivable that the first expansion structure 304 and / or the second expansion structure 306 are configured to expand all wavelengths of laser beam 206 or only the visible light of laser beam 206, with the individual image 210 being guided along a portion of the projection path.
[0068] Depending on a configuration of the first and / or second expansion structure 304 and 306, it is provided that the coupling-out structure 308 of the waveguide 300 is designed to couple out the individual image 210 of the laser beam 206 from the second plurality 312 of images 208 of the laser beam 206, in the coupling-out direction 104 dependent on the emission direction 102 of the laser beam 206, for the specific wavelength range of the laser beam 206. The coupling-out structure 308 has an output section for the non-visible rays of the laser beam 206, which is selected, for example, in such a size that the output section for the non-visible rays of the laser beam 206 is struck by only a single image of the laser beam 206 from the second plurality 312 of images 208, and the individual image 210 is coupled out.
[0069] Figure 1b shows a side view of the device 100 and the eye 2 in a schematic representation. For illustration, the radiation direction 102 is variable in a spatial dimension at a first, for example, vertical, radiation angle and encompasses a range between a radiation direction 102a and a radiation direction 102c. Furthermore, for reasons of clarity, Figure 1b shows, by way of example, only a decoupling of the individual image 210. However, a decoupling of the second plurality 312 of images 208 takes place accordingly.
[0070] In the example, the coupling-out direction 104 comprises a region between a coupling-out direction 104a and a coupling-out direction 104d. If the emission direction 102 changes, the coupling-out direction 104 also changes accordingly, whereby the eye 2 is scanned by means of a scanning movement of the emission direction 102. For each emission direction 102, a point on the eye 2 is illuminated with invisible rays via a corresponding coupling-out direction 104 for the individual image 210. Due to a surface of the eye 2, the illuminated point generates scattered light 6 from invisible rays. The illumination device 100 is operated in continuous wave, for example. In the example, the laser beam 206 is coupled out with the emission direction 102a in the coupling-out direction 104a and with the emission direction 102c in the coupling-out direction 104d.
[0071] In one embodiment, the radiation direction 102 is variable in two spatial dimensions. The radiation direction 102 is changed from the first, for example, vertical, radiation angle to a second, for example, horizontal, radiation angle.
[0072] The waveguide 300 is, for example, in a lens 402 of the data glasses
[0073] 400 is integrated. The waveguide 300 serves as a display for the data glasses 400 and yet includes a sensor system, in the form of the functional path, for example, for determining the gaze vector.
[0074] Figure 2a shows an embodiment of the device 100 in a schematic representation. It can be provided that the device 100 comprises a detector 106, in particular a photodiode. The waveguide 300 comprises at least one collection structure 314, which is designed to guide the scattered light 6, in particular the scattered light 6 of the eye 2, to the detector 106 via an imaging path 316. It is possible to place the detector 106 outside the user's field of vision. Furthermore, the waveguide 300 also allows free placement of the illumination device 100. In the example, the detector 106 and the illumination device 100 are arranged in a temple 404 of the data glasses 400.
[0075] It can be provided that the at least one collection structure 314 is designed to guide the scattered light 6 of a specific wavelength range or a specific wavelength, in particular a wavelength range or a wavelength of the laser source 204 of the illumination device 200, to the detector 106. This creates an optical filter that only guides the scattered light 6 to the detector 106 that is relevant, for example, for determining the gaze vector. The at least one collection structure 314 can, for example, be designed as a Bragg structure in the form of a volume hologram; these have wavelength selectivity. Thus, the waveguide 300 comprises a further part of the sensor system, in the form of the collection structure 314 and the imaging path 316, for determining the gaze vector.
[0076] In the example of Figure 2a, the at least one collection structure 314, in particular a reflection hologram, is designed to reflect the scattered light 6 to the detector 106. In particular, the point on the eye 2 illuminated by the individual image 210 is imaged onto the detector 106.
[0077] The detector 106 is scanned at discrete-time points, for example, using an analog-to-digital converter. Based on the radiation direction 102, for example, the first radiation angle and the second radiation angle, an intensity measured at the detector 106, caused by the imaged illuminated point on the eye 2, is assigned to an image point. From this, a position of a pupil 4 of the eye 2 can then be determined, which correlates to a gaze vector. A three-dimensional model of the eye 2 can be determined from a sequence of images of the pupil 4, which can be used to determine the gaze vector.
[0078] Figure 2b shows a partial section of the waveguide 300 and the spectacle lens 402 in a schematic representation. In this embodiment, the waveguide 300 or the spectacle lens 402 comprises the detector 106. The at least one collecting structure 314 is a transmission hologram and is designed to image the scattered light 6 onto the detector 106. A line 108 of the detector 106 is embedded in the spectacle lens 402 or the waveguide 300. It can be provided that an optical bandpass filter is arranged in front of the detector 106, which, for example, blocks visible light and only allows the invisible rays of the laser beam 206 to pass through. Alternatively, a collecting lens can be provided in front of the detector 106, which is designed, for example, as a hologram, in particular as an infrared hologram, in the event that the invisible rays of the laser beam 206 are infrared rays.Thus, the collection efficiency and signal quality of the detector are improved.
[0079] Figure 2c shows an embodiment of the device 100 in a schematic representation. It can be provided that the at least one collection structure 314 comprises a plurality of collection structures 314a, 314b, 314c, which are designed to guide the scattered light 6 via the imaging path 316 to the detector 106. The individual collection structures or the individual collection structure 314; 314a, 314b, 314c can be designed as a coupling structure for the scattered light 6 and guide it to the detector 106 by means of waveguides, which are integrated, for example, in the spectacle lens 402 or in the waveguide 300.
[0080] It can be provided that the output coupling structure 308 forms the at least one collection structure 314; 314a, 314b, 314c and the waveguide 300 at least partially encompasses the imaging path 316, wherein the at least one collection structure 314; 314a, 314b, 314c guides the scattered light 6 to the detector 106. The imaging path 316 and / or the projection path and / or the functional path can partially overlap, for example, by means of a multiplex hologram. In this embodiment, the output coupling structure 308 acts as an input coupler for the scattered light 6, and the input scattered light 6 is guided through the waveguide 300 to the detector 106.
[0081] It is conceivable that the detector 106 alternatively directly captures an image of the eye 2 as well as the scattered light 6. The detector can be arranged on a frame or a temple 404 of the data glasses 400.
[0082] Figures 3a and 3b show an embodiment of the waveguide 300 in a schematic representation. It can be provided that the at least one coupling structure 302 comprises at least a first part 302a and at least a second part 302b. The at least one first part 302a of the coupling structure 302 is designed to couple a laser beam 206 emitted in at least a first specific region 102a of the emission direction 102 into the waveguide 300. The first specific region 102b comprises, for example, all emission directions 102 in a region between the emission direction 102a and the emission direction 102b. In this case, the emission direction 102b has, for example, a greater emission angle than the emission direction 102a.
[0083] The at least one second part 302b of the coupling structure 302 is configured to couple a laser beam 206 emitted in at least one second specific region 102b of the emission direction 102 into the waveguide 300. The second specific region 102b comprises, for example, all emission directions 102 in a region between the emission directions 102b and 102c. The emission direction 102c has, for example, a larger emission angle than the emission direction 102b.
[0084] In this embodiment, the at least one first expansion structure 304 comprises at least a first part 304a and at least a second part 304b. The at least one first part 304a of the first expansion structure 304 is designed to expand the laser beam 206 coupled in by the at least one first part 302a of the coupling structure 302 into at least a first part 310a of the first plurality 310 of images 208 in the first dimension. The at least one second part 304b of the first expansion structure 304 is designed to expand the laser beam 206 coupled in by the at least one first second part 302b of the coupling structure 302 into at least a second part 310b of the first plurality 310 of images 208 in the first dimension.
[0085] In this embodiment, the at least one second expansion structure 306 comprises at least a first part 306a and at least a second part 306b. The at least one first part 306a of the second expansion structure 306 is configured to expand the at least one first part 310a of the first plurality 310 of images 208 into at least a first part 312a of the second plurality 312 of images 208 in the second dimension.
[0086] The at least one second part 30b of the second expansion structure 306 is configured to expand the at least one second part 310b of the first plurality 310 of images 208 into at least one second part 312b of the second plurality 312 of images 208 in the second dimension.
[0087] In this embodiment, the at least one coupling-out structure 308 comprises at least a first part 308a and at least a second part 308b. The at least one first part 308a of the coupling-out structure 308 is configured to couple the at least one first part 312a of the second plurality 312 of images 208 out of the waveguide 300, in particular in the direction of the eye 2.
[0088] The at least one second part 308b of the coupling-out structure 308 is designed to couple the at least one second part 312b of the second plurality 312 of images 208 out of the waveguide 300, in particular in the direction of the eye 2.
[0089] It can be provided that the at least one first part 308a of the decoupling structure 308 is designed to decouple the individual image 210 from the at least one first part 308a of the second plurality 312 of images 208, for the at least one first specific region 102a of the emission direction 102, in the decoupling direction 104 dependent on the emission direction 102 of the laser beam 206. The at least one second part 308b of the decoupling structure 308 is designed to decouple the individual image 210 from the at least one second part 312b of the second plurality 312 of images 208, for the at least one second specific region 102b of the emission direction 102, in the decoupling direction 104 dependent on the emission direction 102 of the laser beam 206.
[0090] The first part 308a of the coupling-out structure 308 couples out all images 208 as well as the individual image 210 of the laser beam 206, for which the laser beam 206 is coupled in a radiation direction 102 in a region between the radiation directions 102a and 102b, in a coupling-out direction 104 in a region between the coupling-out directions 104a and 104b. The second part 308b of the coupling-out structure 308 couples out all images 208 as well as the individual image 210 of the laser beam 206, for which the laser beam 206 is coupled in a radiation direction 102 in a region between the radiation directions 102b and 102c, in a coupling-out direction 104 in a region between the coupling-out directions 104c and 104d.
[0091] The at least one first part 308a of the output structure 308 and the at least one second part 308b of the output structure 308 are spatially offset in this embodiment. Accordingly, the eye 2 is illuminated with invisible rays from different perspectives depending on the radiation direction 102. The eye 2 is thus illuminated at all times with a single, individual image 210, which is emitted from different locations depending on the radiation direction 102.
[0092] The first part 308a and the second part 308b of the coupling-out structure 308 are, in particular, designed such that an illuminated region of the eye 2 enclosed by the coupling-out direction 104a and the coupling-out direction 104b and an illuminated region of the eye 2 enclosed by the coupling-out direction 104c and the coupling-out device 104d at least partially overlap, in particular in a region of the pupil 4 of the eye 2. As a result, the detector 106 captures images of the pupil 4 from different perspectives. Using these images and, for example, the known radiation direction 102, the known coupling-out direction 104, and a known coupling-out location of the individual image 210, the pupil 4 of the eye 2 can be modeled in space using stereo construction algorithms.
[0093] By means of the first part 308a of the coupling-out structure 308, for example, the eye 2 is illuminated from a first perspective, and a first image of the pupil 4 is captured by the detector 106. By means of the second part 308b of the coupling-out structure 308, for example, the eye 2 is illuminated from a second perspective, and a second image of the pupil 4 is captured by the detector 106. With a known position and orientation of the coupling-out sections of the coupling-out structure 308, from which the individual image 210 is coupled out as if from a point light source, two cones can be formed from a pupil shape of the pupil 4 detected by the detector 106 and the known position and orientation of the coupling-out sections of the coupling-out structure 308. For example, the pupil shape is a base area of these cones. In this example, a cutting plane of these cones results in a position and orientation of the pupil 4 in space.
[0094] Figures 4a, 4b, and 4c show the illumination device 200 and embodiments of the illumination device 200 in a schematic representation. It can be provided that the illumination device 200 comprises at least one beam deflection device 214, in particular a prism, which is designed to fold a beam of the laser source 204 into a beam of the at least one laser light source 202, 202a, 202b, 202c. In the example, the laser light source 202 is an RGB laser with a light source 202a for red light, a light source 202b for green light, and a light source 202c for blue light. It can be provided that the laser light source 202 and the laser source 204 for non-visible rays are integrated in a projection module 226.
[0095] In one embodiment, the illumination device 200 comprises a module 222, which includes the laser source 204 and the at least one laser light source 202, 202a, 202b, 202c, as well as a first waveguide 218 for the laser source 204 and at least one second waveguide 220a, 220b, 220c for the at least one laser light source 202, 202a, 202b, 202c, and an exit section 224, in particular an exit lens. The exit section 224 is designed to combine the first waveguide 218 and the at least one second waveguide 220a...220c.
[0096] It can be provided that the illumination device 200 comprises a deflection device 216, in particular a tilting mirror in the form of a micro-electro-mechanical system mirror, which is designed to direct the laser beam 206 into the emission direction 102 by means of at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle, wherein the deflection device 216 is designed in particular to scan the at least one coupling structure 302 and thus also the eye 2 in a pattern 108, in particular a line-shaped or column-shaped pattern. A combination of the first deflection angle and the second deflection angle results in the emission direction 102 of the laser beam 206. This combination of the deflection angles or the resulting emission direction 102 can also be referred to as a field point.
[0097] In this embodiment, the individual image 210 represents a single image of the deflection device 216 for the non-visible rays of the laser beam 206. Depending on the field point or radiation direction 102, the non-visible rays of the laser beam 206 are coupled out of the individual image 210 in the corresponding coupling-out direction 104. For the visible light of the laser beam 206, the second plurality 312 of images 208 represents a corresponding number of images of the deflection device 216, for which the visible light of the laser beam 206 is coupled out in the coupling-out direction 104 by means of the coupling-out structure 308, depending on the field point of the deflection device 216.
[0098] It can be provided that the deflection device 216 constructs the image to be displayed more quickly, in particular, it addresses all field points more quickly than the detector 106 can capture a frame. The detector 106 thereby records an image of several, in particular all, field points. In this case, the laser light source 202 and the laser source 204 can be deflected using the same tilt seal.
[0099] It can be provided that the scattered light 6 is coupled into the waveguide 300 through the coupling-out structure 308 and coupled out through the coupling-in structure 302, wherein a beam splitter separates the scattered light 6 and the laser beam 206 and images the scattered light 6 onto the detector 106. In this case, the imaging path 316 and / or the functional path and / or the projection path within the waveguide 300 can completely overlap using multiplex holograms.
[0100] In one embodiment, the illumination device 200 comprises the detector 106 and is designed, for example, as a laser detector unit. In this case, the deflection device 216 is to be controlled so slowly that the scattered light e of individual field points can be recorded by a detector of the laser detector unit. A sampling rate of the detector of the laser detector unit is lower than the control rate of a conventional tilting mirror. Due to the slow deflection device 216 in this example, the same deflection device 216 cannot often be used to construct the image to be generated from the visible light of the laser beam 206 as is used for scanning the eye 2 using the invisible rays of the laser beam 206. In this case, at least one further slow deflection device 216 is used in the projection path to construct the image to be generated.
[0101] Figure 5a shows a flowchart of a method 500, in particular for data glasses 400. The method 500 comprises generating 502 a laser beam 206 comprising visible light and infrared rays by means of an illumination device 100 comprising at least one laser light source 202 for visible light, for example an RGB laser light source 202, and a laser source 204 for non-visible rays.
[0102] The method 500 comprises emitting 504 the laser beam 206 in an emission direction 102 that is variable in at least one spatial dimension, in particular in two spatial dimensions, and coupling 506 the laser beam 206 emitted in the emission direction 102 into a waveguide 300 by means of at least one coupling structure 302 encompassed by the waveguide 300.
[0103] The method 500 comprises expanding 508 the coupled laser beam 206 in a first dimension into a first plurality 310 of images 208 of the laser beam 206 by means of at least one first expansion structure 304 and expanding 510 the first plurality 310 of images 208 of the laser beam 206 in a second dimension into a second plurality 312 of images 208 of the laser beam 206 by means of at least one second expansion structure 306.
[0104] The method 500 comprises decoupling 512 and, in particular, emitting the second plurality 312 of images 208 of the laser beam 206 from the waveguide 300 in a direction of an eye 2 of a user, by means of a decoupling structure 308, wherein images 208 of the second plurality 312 of images 208 of the laser beam 206 are coupled out in an outcoupling direction 104 depending on the emission direction 102 of the laser beam 206. The images 208 of the plurality 312 of images 208 each comprise an image to be displayed for the user. This image is generated by varying the emission direction 102 and, for example, by varying a wavelength of the visible light of the laser beam 206, for example, by the RGB laser light source.
[0105] In the method, a single image 210 is also coupled out 514 in the coupling-out direction 104 dependent on the emission direction 102 of the laser beam 206 by means of the waveguide 300 for a specific wavelength range of the laser beam 206, in particular a specific wavelength of the laser beam 206, in particular of rays that are not visible to the user, for example a wavelength or a wavelength range of infrared rays, and is emitted in particular in the direction of the eye 2.
[0106] It can be provided that, by means of the coupling-out structure 308 of the waveguide 300, for the specific wavelength range of the laser beam 206, the individual image 210 of the laser beam 206 is coupled out 514 from the second plurality 312 of images 208 of the laser beam 206 in the coupling-out direction 104 dependent on the emission direction 102 of the laser beam 206. In this case, the coupling-out structure 308 has, for example, an output coupling section for the non-visible rays of the laser beam 206, which is dimensioned in such a size that this output coupling section is only hit by a single image, namely the individual image 210, from the plurality 312 of images 208 and couples it out.It can be provided that the method 500 comprises guiding 516 scattered light 6, in particular scattered light 6 of the eye 2, via an imaging path 316 to a detector 106, in particular a photodiode, by means of at least one collection structure 314; 314a, 314b, 314c, in particular a plurality of collection structures 314, which the waveguide 300 comprises.
[0107] It can be provided that the scattered light 6 of a specific wavelength range or a specific wavelength, in particular a wavelength range or a wavelength of the laser source 204 of the illumination device 200, is guided 516 to the detector 106 by means of the at least one collecting structure 314, 314a, 314b, 314c. This creates an optical filter, since only the scattered light 6 generated by the non-visible rays of the laser beam 206 on the eye 2 is guided 518 to the detector 106.
[0108] It can be provided that the at least one collection structure 314; 314a, 314b, 314c is encompassed by the coupling-out structure 308 and the imaging path 316 is at least partially encompassed by the waveguide 300, wherein the scattered light 6 is guided to the detector 106 by means of the at least one collection structure 314; 314a, 314b, 314c.
[0109] It can be provided that the scattered light 6 is reflected to the detector 106 by means of the at least one collection structure 314; 314a, 314b, 314c, in particular a reflection hologram.
[0110] It can be provided that the detector 106 is encompassed by the waveguide 300, and the scattered light 6 is imaged onto the detector 106 by means of the at least one collection structure 314; 314a, 314b, 314c, in particular a transmission hologram.
[0111] Figure 5b shows a flow diagram of part of an embodiment of the method 500. In this embodiment, the method 500 comprises coupling 518 of a laser beam 206 emitted in at least a first specific region 102a of the emission direction 102 into the waveguide 300 by means of at least one first part 302a comprised by the at least one coupling structure 302. In this embodiment, the method 500 comprises coupling 520 of a laser beam 206 emitted in at least a second specific region 102b of the emission direction 102 into the waveguide 300 by means of at least one second part 302b comprised by the at least one coupling structure 302.
[0112] In this embodiment, the method 500 comprises expanding 522 the laser beam 206 coupled by the at least one first part 302a of the coupling structure 302 into at least one first part 310a of the first plurality 310 of images 208 in the first dimension, by means of at least one first part 304a encompassed by the at least one first expansion structure 304.
[0113] In this embodiment, the method 500 comprises expanding 524 the laser beam 206 coupled by the at least one second part 302b of the coupling structure 302 into at least one second part 310b of the first plurality 310 of images 208 in the first dimension, by means of at least one second part 304b encompassed by the at least one first expansion structure 304.
[0114] In this embodiment, the method 500 comprises expanding 526 the at least one first part 310a of the first plurality 310 of images 208 into at least one first part 312a of the second plurality 312 of images 208 of the laser beam 206 in the second dimension, by means of at least one first part 306a comprised by the at least one second expansion structure 306.
[0115] In this embodiment, the method 500 comprises expanding 528 the at least one second part 310b of the first plurality 310 of images 208 of the laser beam 206 into at least one second part 312b of the second plurality 312 of images 208 in the second dimension, by means of at least one second part 306b comprised by the at least one second expansion structure 306. In this embodiment, the method 500 comprises coupling out 530 the at least one first part 312a of the second plurality 312 of images 208 from the waveguide 300, wherein said part is emitted in particular in the direction of the eye 2, by means of at least one first part 308a comprised by the at least one coupling-out structure 308.
[0116] In this embodiment, the method 500 comprises a decoupling 532 of the at least one second part 312b of the second plurality 312 of images 208 from the waveguide 300, wherein said image is radiated in particular in the direction of the eye 2, by means of at least one second part 308b comprised by the at least one decoupling structure 308.
[0117] Figure 5v shows method steps of a further embodiment of the method 500. In this embodiment, the method 500 comprises a decoupling 534 of the individual image 210 of the laser beam 206, for the at least one first specific region 102a of the emission direction 102, in particular from the at least one first part 312a of the second plurality 312 of images 208, in the decoupling direction 104 dependent on the emission direction 102 of the laser beam 206, by means of the at least one first part 308a of the decoupling structure 308.
[0118] In this embodiment, the method 500 comprises a decoupling 536 of the individual image 310 of the laser beam 206, for the second specific region 102b of the emission direction 102, in particular from the at least one second part 312b of the second plurality 312 of images 208, in the decoupling direction 104 dependent on the emission direction 102 of the laser beam 206, by means of the at least one second part 308b of the decoupling structure 308. In this case, the at least one first part 308a of the decoupling structure 308 and the at least one second part 308b of the decoupling structure 308 are spatially offset.
[0119] It can be provided that a beam of the laser source 204 is folded into a beam of the laser light source 202 by means of a beam deflection device 214, in particular a prism, included in the illumination device 200. It can be provided that the laser source 204 and the at least one laser light source 202 are included in a module 222 included in the illumination device 100. In this case, a first waveguide 218 for the laser source 204 and at least one second waveguide 220a, 220b, 220c for the laser light source 202 and an exit section 224 are included in the module 222. The first waveguide 218 and the at least one second waveguide 220a, 220b, 220c are combined by means of the exit section 224.
[0120] Figure 5d shows method steps of a further embodiment of method 500. In this embodiment, method 500 comprises directing 538 the laser beam 206 through at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle, in the emission direction 102 by means of a deflection device 216 included in the illumination device 200, in particular a micro-electro-mechanical system mirror. Furthermore, method 500 comprises scanning 540 the at least one coupling structure 302, in particular in a line-shaped or column-shaped pattern 108, by means of the deflection device 216.
[0121] Figures 5a to 5d depict method steps of method 500 and embodiments of method 500. The sequences or combinations shown therein, as well as the starting and end points, are for illustrative purposes only. Further embodiments of the method with other combinations or sequences of the method steps shown are conceivable.
Claims
Claims 1. Device (100), in particular for data glasses (400), comprising: an illumination device (200) which comprises at least one laser light source (202, 202a, 202b, 202c) for visible light, for example an RGB laser light source, and a laser source (204) for non-visible rays, for example an infrared laser source (204), and which is designed to generate (502) a laser beam (206) which comprises visible light and non-visible rays, and is designed to emit (504) the laser beam (206) in an emission direction (102) which is variable in at least one spatial dimension, in particular in two spatial dimensions; and a waveguide (300), comprising: o at least one coupling structure (302) which is designed to couple (506) the laser beam (206) emitted in the emission direction (106) into the waveguide (300);o at least one first expansion structure (304) which is designed to expand (508) the coupled-in laser beam (206) in a first dimension into a first plurality (310) of images (208) of the laser beam (206); o at least one decoupling structure (308) which is designed to decouple (512) a second plurality (312) of images (208) of the laser beam (206) from the waveguide (300) and in particular to emit them in a direction of an eye (2) of a user, wherein the decoupling structure (308) is designed to decouple (512) images (208) of the laser beam (206) of the second plurality (312) of images (208) in a decoupling direction (104) depending on the emission direction (102) of the laser beam (204); wherein the waveguide (300) is designed for a specific; Wavelength range of the laser beam (206), in particular a specific Wavelength of the laser beam (206), in particular of rays not visible to the user, for example a wavelength or a wavelength range of infrared rays, to couple out (514) a single image (210) in the coupling-out direction (104) dependent on the radiation direction (102) of the laser beam (206) and to radiate it in particular in the direction of the eye (2).
2. The device (100) according to claim 1, wherein the coupling-out structure (308) of the waveguide (300) is designed to couple out (514) the individual image (210) of the laser beam (206) from the second plurality (312) of images (208) of the laser beam (206) for the specific wavelength range of the laser beam (206), in the coupling-out direction (104) dependent on the emission direction (102) of the laser beam (206).
3. The device (100) according to one of the preceding claims, comprising a detector (106), in particular a photodiode, wherein the waveguide (300) comprises at least one collecting structure (314; 314a, 314b, 314c), in particular a plurality of collecting structures (314; 314a, 314b, 314c), which is designed to guide (516) scattered light (6), in particular scattered light (6) of the eye (2), via an imaging path (316) to the detector (106).
4. The device (100) according to claim 3, wherein the at least one collecting structure (314; 314a, 314b, 314c) is designed to guide (516) the scattered light (6) of a specific wavelength range or a specific wavelength, in particular a wavelength range or a wavelength of the laser source (204) of the illumination device (200), to the detector (106).
5. The device (100) according to one of the preceding claims, wherein the waveguide (300) comprises at least one second expansion structure (306) configured to expand (510) the first plurality (310) of images (208) in a second dimension into a second plurality (312) of images (208) of the laser beam (206).
6. The device (100) according to one of the preceding claims, wherein the illumination device (200) comprises at least one beam deflection device (214), in particular a prism, which is designed to fold a beam of the laser source (204) into a beam of the at least one laser light source (202, 202a, 202b, 202c).
7. The device (100) according to one of claims 1 to 5, wherein the illumination device (200) comprises a module (222) which comprises the laser source (204) and the at least one laser light source (202, 202a, 202b, 202c) as well as a first waveguide (218) for the laser source (204) and at least one second waveguide (220a, 220b, 220c) for the at least one laser light source (202, 202a, 202b, 202c) and an exit section (224), in particular an exit lens, wherein the exit section (224) is designed to bring together the first waveguide (218) and the at least one second waveguide (220a...220c).
8. The device (100) according to one of the preceding claims, wherein the illumination device (200) comprises a deflection device (216), in particular a tilting mirror in the form of a micro-electro-mechanical system mirror, which is designed to direct (538) the laser beam (206) in the emission direction (102) by means of at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle, wherein the deflection device (216) is designed in particular to scan (540) the at least one coupling structure (302) in a pattern (108), in particular a line-shaped or column-shaped pattern.
9. A method (500), in particular for data glasses (400), comprising: generating (502) a laser beam (206) comprising visible light and infrared rays by means of an illumination device (100) comprising at least one laser light source (202) for visible light, for example an RGB laser light source (202), and a laser source (204) for non-visible rays; emitting (504) the laser beam (206) in an emission direction (102) that is variable in at least one spatial dimension, in particular in two spatial dimensions; coupling (506) the laser beam (206) emitted in the emission direction (102) into a waveguide (300) by means of at least one coupling structure (302) encompassed by the waveguide (300); expanding (508) the coupled laser beam (206) in a first dimension into a first plurality (310) of images (208) of the laser beam (206) by means of at least one first expansion structure (304); expanding (510) the first plurality (310) of images (208) of the laser beam (206) in a second dimension into a second plurality (312) of images (208) of the laser beam (206) by means of at least one second expansion structure (306);a decoupling (512) and in particular a radiation of the second plurality (312) of images (208) of the laser beam (206) from the waveguide (300) in a direction of an eye (2) of a user, by means of a coupling-out structure (308), wherein images (208) of the second plurality (312) of images (208) of the laser beam (206) are coupled out in a coupling-out direction (104) depending on the radiation direction (102) of the laser beam (206); wherein, by means of the waveguide (300), for a specific wavelength range of the laser beam (206), in particular a specific wavelength of the laser beam (206), in particular of rays not visible to the user, for example a wavelength or a wavelength range of infrared rays, a single image (210) is coupled out (514) in the coupling-out direction (104) dependent on the radiation direction (102) of the laser beam (206) and is emitted in particular in the direction of the eye (2); 10. The method (500) according to claim 9, wherein, by means of the coupling-out structure (308) of the waveguide (300), for the specific wavelength range of the laser beam (206), the individual image (210) of the laser beam (206) is coupled out (514) from the second plurality (312) of images (208) of the laser beam (206) in the coupling-out direction (104) dependent on the emission direction (102) of the laser beam (206).
11. The method (500) according to one of claims 9 or 10, comprising guiding (516) scattered light (6), in particular scattered light (6) of the eye (2), via an imaging path (316) to a detector (106), in particular a photodiode, by means of at least one collecting structure (314; 314a, 314b, 314c), in particular a plurality of collecting structures (314), which the waveguide (300) comprises.
12. The method (500) according to one of claims 9 to 11, comprising: coupling (518) a laser beam (206) emitted in at least a first specific region (102a) of the emission direction (102) into the waveguide (300) by means of at least one first part (302a) comprised by the at least one coupling structure (302); coupling (520) a laser beam (206) emitted in at least a second specific region (102b) of the emission direction (102) into the waveguide (300) by means of at least one second part (302b) comprised by the at least one coupling structure (302); expanding (522) the laser beam (206) coupled in by the at least one first part (302a) of the coupling structure (302) into at least one first part (310a) of the first plurality (310) of images (208) in the first dimension, by means of at least one first part (304a) encompassed by the at least one first expansion structure (304);expanding (524) the laser beam (206) coupled by the at least one second part (302b) of the coupling structure (302) into at least one second part (310b) of the first plurality (310) of images (208) in the first dimension, by means of at least one second part (304b) comprised by the at least one first expansion structure (304); expanding (526) the at least one first part (310a) of the first plurality (310) of images (208) into at least one first part (312a) of the second plurality (312) of images (208) of the laser beam (206) in the second dimension, by means of at least one first part (306a) comprised by the at least one second expansion structure (306); expanding (528) the at least one second part (310b) of the first plurality (310) of images (208) of the laser beam (206) into at least one second part (312b) of the second plurality (312) of images (208) in the second dimension, by means of at least one second part (306b) comprised by the at least one second expansion structure (306); decoupling (530) the at least one first part (312a) of the second plurality (312) of images (208) from the waveguide (300), wherein said part is emitted in particular in the direction of the eye (2), by means of at least one first part (308a) comprised by the at least one decoupling structure (308); a decoupling (532) of the at least one second part (312b) of the second plurality (312) of images (208) from the waveguide (300), wherein said image is radiated in particular in the direction of the eye (2), by means of at least one second part (308b) comprised by the at least one decoupling structure (308).
13. The method (500) according to one of claims 9 to 12, wherein a beam of the laser source (204) is folded into a beam of the laser light source (202) by means of a beam deflection device (214), in particular a prism, comprised by the illumination device (200).
14. The method (500) according to one of claims 9 to 12, wherein the laser source (204) and the at least one laser light source (202) are comprised by a module (222) comprised by the illumination device (100), wherein a first waveguide (218) for the laser source (204) and at least one second waveguide (220a, 220b, 220c) for the laser light source (202) and an exit section (224) are comprised by the module (222), and the first waveguide (218) and the at least one second waveguide (220a, 220b, 220c) are brought together by means of the exit section (224).
15. The method (500) according to one of claims 9 to 14, comprising directing (538) the laser beam (206) by at least one variable deflection angle, in particular by means of a first variable deflection angle and a second variable deflection angle, in the emission direction (102) by means of a Deflection device (216), in particular a micro-electro-mechanical system mirror; and scanning (540) of the at least one coupling structure (302), in particular in a line-shaped or column-shaped pattern (108), by means of the deflection device (216).
16. Data glasses (400) comprising the device (100) according to one of claims 1 to 8, wherein the waveguide (300) is arranged in a spectacle lens (402) of the data glasses (400).
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