Data glasses and method for projecting projection image

Abstract

The invention relates to data glasses having an optical system (115) for projecting a projection image to an imaging region (200) of an eye (205). The optical system (115) comprises a light source (210) for outputting an image, a tracking module (215) for detecting a pupil position of a pupil (217) of an eye (205), and an image shaping module (220) for shaping the output image into an image to be projected. The image shaping module (220) is configured to change an image plane of the image to be projected as a function of the pupil position detected by the tracking module (215). Furthermore, the optical system (115) comprises a reflection module (225) configured to project the image to be projected as a projection image into the imaging region (200) of the eye (205).

Description

Technical Field

[0001] The invention is based on data glasses and a method for projecting a projection image according to the independent claims. The subject matter of the invention is also a computer program. Background Art

[0002] Smart glasses, also known as data glasses or intelligent glasses, can include optical systems for superimposing normal vision with virtual images. In particular, so-called retinal scanning displays describe systems that project images directly onto the user's retina through the pupil. These systems can be configured using a laser scanner module in conjunction with a holographic element that deflects light through the user's pupil. VR systems based on laser scanners and using holographic elements are characterized by a small eye box. Therefore, the glasses must be precisely fitted to the user, and the user must position their pupil in a specific position to avoid image loss. Summary of the Invention

[0003] Against this background, the method proposed herein provides improved data glasses and an improved method for projecting a projection image, as well as a corresponding computer program according to the main claim. Advantageous developments and improvements of the device specified in the independent claim are possible through the measures listed in the dependent claims.

[0004] The data glasses proposed here comprise an optical system, by means of which the eye box can advantageously be adapted to the viewing direction of the user of the data glasses.

[0005] Data glasses are provided that have an optical system for projecting an image onto an imaging region of the eye. The optical system of the data glasses includes a light source for outputting an image, a tracking module for detecting the pupil position of the eye pupil, and an image shaping module for shaping the output image into an image to be projected. The image shaping module is configured to change the image plane of the image to be projected based on the pupil position detected by the tracking module. The optical system also includes a reflection module configured to project the image to be projected as a projection image into the imaging region of the eye.

[0006] The data glasses can be, for example, AR glasses, i.e., glasses with a so-called augmented reality display. In these systems, virtual images can be superimposed on the wearer's normal vision. Furthermore, the optical system of the data glasses proposed herein can provide a so-called retinal scanning display, in which an image, or projected image, can be projected directly through the pupil onto the user's retina. In these systems, the size of the beam projected into the pupil is typically limited due to the finite size of the various components of the data glasses' optical system. Furthermore, the beam entering the pupil must be small enough so that the size of the resulting spot on the retina is not excessively dependent on the eye's accommodation. These and similar conditions therefore limit the possible imaging area of ​​the pupil where the projected image can be imaged. The imaging area (also known as the eye box) defines the area where the pupil should be positioned to see the entire image. The optical system of the data glasses proposed herein advantageously makes it easier to find the eye box and / or dynamically adjust the imaging area to the user's pupil position. To this end, the optical system further includes a light source, such as a laser module with at least one laser, for outputting the image. Advantageously, a tracking module, also known as an eye tracking module, can be used to measure the user's pupil position. For example, it can detect whether the user of the data glasses changes their gaze, for example by moving their pupils vertically or horizontally. This change in pupil position also changes the area in which the image projected by the data glasses can be fully and clearly seen. That is, the imaging area, or eyebox, depends on the eye's gaze direction. Advantageously, the optical system proposed herein includes an image shaping module that can modify the projected image based on the detected pupil position. For example, the image shaping module (also referred to as a dynamic eyebox assembly) can be used to deform specific areas of the image or the entire image so that the projection in the imaging area is perceived by the eye as a properly proportioned image. The data glasses proposed herein have the advantage that the system can self-calibrate to the user's pupil position by determining the pupil position and adapting the eyebox accordingly. During operation, the system achieves optimal resolution in the central visual field by following the user's eye movements and providing natural vision.

[0007] According to one embodiment, the image forming module can be configured to modify the image plane of the projected image by tilting and, in addition or alternatively, rotating components of the image forming module. For example, the image forming module can include at least one reflective element (e.g., a micromirror) that is tiltable or rotatable about at least a longitudinal axis and a transverse axis. This advantageously allows for particularly fine adjustment of the image plane of the projected image, thereby enabling advantageous modifications (e.g., displacement or distortion of the image).

[0008] According to another embodiment, the image forming module can be configured to change the position of the imaging area of ​​the projected image. For example, the image forming module can be used to move the eye box in the user's pupil plane. This offers the advantage of maintaining unobstructed perception of the projected image even when the gaze direction changes.

[0009] According to another embodiment, the image shaping module can be configured to change the extent of the imaging area of ​​the projected image. For example, the imaging area can be enlarged by the image shaping module, that is, the entire eye box can be expanded. This offers the advantage that the projected image can be projected over a larger area and more easily perceived by the eye.

[0010] According to another embodiment, the image-forming module may include at least one movable lens element and, in addition or as an alternative, a micromirror element. For example, the image-forming module may include both a movable, i.e., tiltable, and, in addition or as an alternative, rotatable lens and, for example, a similarly movable 2D micromirror. For example, the position of the eye box in the user's pupil plane can be moved by tilting the micromirror. The combination of a lens element and a mirror element offers the advantage that the image plane of the projected image and, consequently, the imaging area of ​​the projected image, can be modified in particularly detail.

[0011] According to another embodiment, the optical system of the data glasses may include a focusing module for focusing the output image and (in addition or alternatively) the image to be projected. Such an optical focusing system may, for example, consist of a tunable lens and a focusing lens. The order of the lenses in the system can be varied and selected accordingly for the data glasses. The focusing module can advantageously be used to adjust the resolution of the projected image on the retina and the beam size in the pupil plane of the user.

[0012] According to another embodiment, the optical system of the data glasses may include a mirror module for directing the image to be projected toward the reflective module. For example, the mirror module may include one or more micromirrors that can be aligned such that the image to be projected is advantageously optimally directed toward the reflective module.

[0013] According to another embodiment, the reflection module can be configured to include at least one holographic optical element. For example, the reflection module can include one or more HOEs (holographic optical elements), which can be embedded in the lenses of data glasses, for example. Holographic optical elements can advantageously be used to steer the image to be projected particularly precisely and project it as a projection image onto an imaging area in the pupil plane of the user.

[0014] According to another embodiment, the optical system can be manufactured using MEMS technology. For example, dynamic position adjustment of the eye can be achieved using a MEMS system. This has the advantage that all components used can be extremely small (i.e., miniaturized). Overall, the system can be made very small and can be integrated into the small frame format of data glasses.

[0015] Furthermore, a method for projecting an image onto an eye imaging region is proposed. The method includes the steps of outputting an image, detecting the position of the eye pupil, and shaping the outputted image into an image to be projected. The image plane of the image to be projected is changed based on the detected pupil position. Furthermore, the method includes the step of projecting the image to be projected as a projection image onto the eye imaging region.

[0016] The method can be implemented, for example, in software or hardware or in a hybrid form of software and hardware (for example in a control unit).

[0017] Also advantageous is a computer program product or a computer program having a program code that can be stored on a machine-readable carrier or storage medium, such as a semiconductor memory, hard disk storage or optical storage, and is used to execute, implement and / or control the steps of the method according to any of the above embodiments, in particular when the program product or program is executed on a computer or device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] An example of the implementation of the method proposed herein is shown in the accompanying drawings and described in detail in the following description.

[0019] Figure 1 A schematic diagram of data glasses according to an implementation example;

[0020] Figure 2 A schematic diagram of a data glasses optical system according to an implementation example;

[0021] Figure 3 A schematic diagram of a data glasses optical system according to an implementation example;

[0022] Figure 4 A flow chart of an example implementation of a method for projecting an image onto an imaging area;

[0023] Figure 5a A schematic diagram of a data glasses optical system according to an implementation example;

[0024] Figure 5b A schematic diagram of an offset imaging area according to an example implementation;

[0025] Figure 6 A schematic diagram of a rotational projection image according to an implementation example;

[0026] Figure 7 A schematic diagram of an offset imaging region 200b according to an implementation example;

[0027] Figure 8 A schematic diagram of eye rotation capability according to an example embodiment;

[0028] Figure 9 A schematic diagram of eye vision according to an implementation example; and

[0029] Figure 10 Schematic diagram of a data glasses optical system according to an implementation example. DETAILED DESCRIPTION

[0030] In the following description of advantageous implementation examples of the present invention, the same or similar reference numerals are used for elements shown in the various figures and having similar functions, and repeated description of these elements is omitted.

[0031] Figure 1 A schematic diagram of data glasses 100 according to one exemplary embodiment is shown. In this illustrated exemplary embodiment, data glasses 100 (also referred to as smart glasses) are positioned on the head of a user 105, with lenses 111 and 112 covering the user's eyes. The data glasses 100 shown here are configured as so-called AR glasses, having an augmented reality display for superimposing virtual images on the user's 105 normal vision. In particular, data glasses 100 are configured with a retinal scanning display, i.e., a system in which images are scanned directly through the pupil onto the user's retina. These systems exemplarily include a laser scanner module and a holographic optical element that directs light through the user's 105 pupil.

[0032] In these systems, the size of the beam projected into the pupil is typically limited because the components used in the system have finite sizes. Furthermore, the beam entering the pupil should be small so that the spot size produced on the retina does not depend excessively on the eye's accommodation. The resulting imaging area at the pupil, the so-called eye box (which defines the area in which the pupil must be positioned to see the entire image), is limited.

[0033] The data glasses 100 shown here include an optical system 115, which is described in detail in the following figures, and which enables the user 105 to easily find the eye box and / or dynamically adjust the eye box to the user's pupil position. A special embodiment with movable elements is proposed, which can be manufactured using MEMS technology.

[0034] Figure 2 FIG2 shows a schematic diagram of an optical system 115 of data glasses according to an embodiment. The optical system 115 shown here corresponds to or is similar to the optical system described in the previous figure and can be used in the data glasses as described above.

[0035] The optical system 115 is designed to project a projection image onto an imaging region 200 of an eye 205. To this end, the optical system 115 comprises a light source 210 for outputting the image. In one embodiment, this is a laser module having at least one laser.

[0036] Furthermore, the optical system 115 comprises a tracking module 215 for detecting a pupil position of a pupil 217 of the eye 205. The tracking module 215 may also be referred to as an eye tracking module.

[0037] The optical system 115 further includes an image forming module 220 configured to transform the image output by the light source 210 into an image to be projected. The image forming module 220, which may also be referred to as a dynamic eye box assembly, is configured to change the image plane of the image to be projected in response to the pupil position detected by the tracking module 215. Thus, the position of the imaging area 200 in the user's pupil plane is movable.

[0038] The image to be projected can be projected as a projection image into the imaging region 200 of the eye 205 by means of a reflection module 225. In one embodiment, the reflection module 225 is configured with a holographic optical element (HOE) to converge the light beams directed thereto and deflect them as a projection image toward the imaging region 200.

[0039] In one embodiment, a focusing module 230 is further exemplarily arranged between the image forming module 220 and the tracking module 215. In one embodiment, the focusing module 230 is configured to focus the image to be projected. In one embodiment, the focusing module 230 is configured to set the image resolution on the user's retina and the beam size in the pupil plane.

[0040] Furthermore, in one embodiment, optical system 115 includes a mirror module 235, which is arranged, for example only, between the tracking module and the reflective module and configured to direct the image to be projected toward reflective module 225. In one embodiment, mirror module 235 includes at least one micromirror for this purpose. For example only, the image to be projected can be directed by the micromirror to projection lens 238, which converges the light beam and directs it toward the reflective module.

[0041] In other words, the structure shown here includes a laser module having at least one laser, a dynamic eye box group having the function of moving the eye box position in the user's pupil plane, a focusing element group having the function of setting the resolution of the projected image on the retina and setting the light beam size in the user's pupil plane, an eye tracking module having the function of measuring the user's pupil position, a micromirror module having the function of guiding the light beam to the HOE, a lens or projection element having the function of matching the image guided by the micromirror to the desired illumination area at the HOE, and a reflective element using the HOE on the lens as a reflective element and having the function of turning the illumination area toward the eye box in the user's pupil plane.

[0042] Of course, the order of the groups in the present invention is not fixed, but can be selected according to the requirements and limitations of the optical design. The movable part for realizing the dynamic eye box function can be optionally integrated into the focus group, such as in a lens with a movable focus.

[0043] Figure 3 FIG1 shows a schematic diagram of a data glasses optical system 115 according to an embodiment of the present invention. The optical system 115 shown here corresponds to or is similar to the optical system described in the previous figure and is as described above. Figure 1 The data glasses are configured to project a projection image onto an imaging region 200 of an eye 205. The optical system of the data glasses includes a light source 210 for outputting an image, a tracking module 215 for detecting the pupil position of a pupil 217 of the eye 205, and an image shaping module 220 for shaping the output image into an image to be projected. Typically, the image shaping module 220 is configured to change the image plane of the image to be projected based on the pupil position detected by the tracking module 215. Furthermore, the optical system includes a reflection module 225, which is configured to project the image to be projected as a projection image into the imaging region 200 of the eye 205.

[0044] In this embodiment, a collimating lens 300 is further disposed between the light source 210 and the image forming module 220. The collimating lens 300 is configured to collimate the light or laser beam outputted by the light source so as to guide it to the image forming module 220 in a convergent manner.

[0045] In this embodiment, the image forming module 220 includes a micromirror element 305 that is illustratively movable about a longitudinal axis and a transverse axis. It is illustratively tiltable or rotatable along these axes. Thus, the image forming module 220 is configured to change the image plane of the image to be projected by tilting and / or rotating the image forming module element.

[0046] For example only, the image forming module 220 is configured to change the position of the imaging region 200 of the projected image. For example, by tilting the micromirror elements accordingly, the imaging region can be moved, for example, from a region directly in front of the face to a slightly sideways position, so that when the gaze direction of the eye 205 changes (e.g., to the side), the projected image can still be perceived clearly and in detail. Furthermore, the image forming module 220 is illustratively configured to change the extent of the imaging region of the projected image, for example, to increase it.

[0047] In other words, with the optical system 115 shown here, at least one laser beam can be collimated by a collimating lens 300 , wherein optionally a plurality of lasers can be used and combined by suitable optical devices and then enter a focusing optical group.

[0048] In this embodiment, the optical focusing group includes a tunable lens 310 (illustratively arranged between the collimating lens 300 and the image forming module 220) and a focusing lens 230. The order and position of the lenses in the system are variable and can be selected accordingly. The dynamic eye box module is shown here as a 2D micromirror. By tilting the light beam direction at the micromirror element 305, the light is projected onto the reflective module 225 (illustratively configured with an HOE), and then, via the projection lens 238, the eye box can be displaced in the user's pupil plane. An eye tracking system is added to the optical path, illustratively using an infrared (IR) emitting element. This module has the function of determining the position of the pupil in the user's pupil plane. The mirror element 237 is illustratively implemented by combining two 1D scanning elements, but can also be implemented using a 2D scanning mirror. Using two 1D mirrors has advantages, as discussed below, particularly when the first mirror is fast and resonant, scanning vertically in the HOE plane, while the second mirror is quasi-static, scanning horizontally in the HOE plane.

[0049] The projection lens 238 shapes the image to be projected, which is steered by the mirror module 235, so that it fills the desired area in the HOE plane. The reflective element 225 steers the light at the projection surface 315 to the imaging area 200 in the pupil plane of the user.

[0050] Figure 4 A flowchart 400 illustrates an exemplary implementation of a method for projecting an image onto an imaging area. The method 400 includes a step 405 of outputting an image, a step 410 of detecting the position of an eye pupil, and a step 415 of shaping the output image into an image to be projected. The image plane of the image to be projected is altered based on the detected pupil position. Furthermore, the method 400 includes a step 420 of projecting the image to be projected as a projection image onto the imaging area of ​​the eye.

[0051] Figure 5a FIG1 shows a schematic diagram of a data glasses optical system 115 according to an embodiment. The optical system 115 shown here corresponds to or is similar to the aforementioned Figure 1 、 2 and the optical system described in 3.

[0052] By tilting the exemplary 2D micromirrors of the image forming module 220, the position of the imaging area 200 in the pupil plane of the user can be moved. Tilting the micromirrors in this exemplary angle α corresponds to an eyebox displacement δd, where the displacement direction is related to the orientation of the tilt angle α. Examples of such eyebox displacements are shown in the following Figure 5b middle.

[0053] Figure 5b A schematic diagram 500 of an offset imaging region 200b according to an exemplary embodiment is shown, wherein the schematic diagram 500 has an exemplary scale (Maβstab) of 2.2000 mm to 3.2000 mm.

[0054] Here according to the above Figure 5a The described image forming module tilting achieves eye box displacement. When the exemplary 2D mirror is mechanically tilted 1.0° horizontally, the original imaging area 200a can achieve a displacement of 0.65 mm to the offset imaging area 200b.

[0055] Figure 6 FIG. 6 is a schematic diagram showing a rotating projection image 600 according to an implementation example.

[0056] When looking closely at the eyebox morphology, a rotation of the projected image 600 entering the user's eye can be observed at certain displacements of the image forming module. In this case and as shown in this figure, an exemplary eyebox displacement is shown (for the middle and outermost horizontal rays with and without eyebox displacement). It can be seen that the direction of the middle ray is tilted between the two eyeboxes. In the current simulation, for an offset eyebox distance of 0.65mm, the rotation angle θ is already 10°. Although the image can be corrected digitally, exceeding 10° will mean a direct reduction of half the field of view by 10°. The present invention aims to correct this problem and build a system that can still work with a reduced available field of view (FOV). The rotation angle θ is minimized when the eyebox morphology is placed. This geometric effect is shown in the subsequent Figure 7 .

[0057] Figure 7 FIG. 2 shows a schematic diagram of an offset imaging area 200 b according to an implementation example.

[0058] When convergence points 700a and 700b are moved behind the user's pupil plane 705, the rotation angle θ1 decreases to θ2. A convergence point can be understood as, for example, a vanishing point at which points in the pupil plane are imaged onto an area behind the pupil plane, or toward which points on the pupil plane superficially converge. However, moving convergence points 700a and 700b behind the user's pupil means that the imaging light rays no longer intersect the user's pupil plane at a single location, but rather that the intersection points of the individual rays are separated. If the distribution of the intersection points is too large, not all light rays will enter the user's pupil. Therefore, the convergence point behind the user's pupil position is limited.

[0059] Figure 8 A schematic diagram illustrating the rotation capability of the eye 205 according to an example implementation is shown.

[0060] To strike a balance between the user's pupil's ability to perceive various light directions and the need to minimize image rotation when the eye box is shifted, the characteristics of the human eye can be exploited by evaluating the relationship between eye rotation and pupil displacement and the field of view characteristics of human vision.

[0061] The standard model of the eye 205 (e.g., the Gullstrand model) uses an eyeball with a diameter d of 24.0 mm. If the center of rotation is considered, the front Figure 5b The 0.65 mm displacement v shown corresponds to an eye displacement or eye rotation α of 3.1°. This is much lower than the 10° image rotation we observed and should be reduced. To do this, the following Figure 9 Vision characteristics shown.

[0062] Figure 9 A schematic diagram illustrating the vision of an eye 205 according to an implementation example is shown.

[0063] The clarity of the human eye 205 decreases with the angular spread of the scene being viewed. Central vision 900 is sharpest, decreasing toward the subcentral angle 902, the macular angle 904, and finally the near peripheral angle 906. Considering larger viewing angles is unnecessary because it is not relevant to small smart glasses, where the usable field of view is limited by the compactness of the optical system.

[0064] In this implementation example, it is assumed that the Gaussian standard deviation at 10° eccentricity is approximately 2 arc minutes. In this simulation, this corresponds to a light spot approximately 3 to 4 times larger at the user's pupil plane. The aforementioned optical system then sets the HOE characteristics to adjust the light beam convergence behind the user's pupil plane. The horizontal movement of the micromirror module is synchronized with the adjustable focusing lens to defocus the light beam at a larger angle and increase the beam size in the user's pupil plane. In this way, each light ray can enter the user's pupil even if they do not intersect the user's pupil plane at a common position.

[0065] The eye tracking system follows the position of the user's pupils, ensuring that the adjustable focus lens always sees the direction of gaze and defocuses accordingly when moving away from it. The dynamic eyebox movement system also adapts to the user's position. When the system is perfectly set up, the natural rotation of the eye is linked to a corresponding rotation of the projected image. Digital image correction is responsible for matching these two rotations and providing the viewer with a natural view of the projected image. Figure 5a With the described system adjustment, the convergence point can be moved behind the user's pupil plane.

[0066] Figure 10 FIG1 shows a schematic diagram of a data glasses optical system 115 according to an embodiment. The optical system 115 shown here corresponds to or is similar to the aforementioned Figure 1 、 2 , 3 and 5. The imaging area 200 is additionally shown as a schematic diagram in this figure.

[0067] In this embodiment, the eyebox's lateral extension, l, is only illustratively 3.5 mm. As previously described, the 3.5 mm diameter pupil must now be precisely centered to capture the projected image. To ensure that even a small or off-center pupil can perceive each image light beam, lens element 310 (i.e., a tunable lens) defocuses the light beam to compensate for the human eye's perceptual limitations and substantially increases the beam size at the edges of the scan amplitude. Some lateral light rays are clipped outside the imaging region. This loss in image intensity can be compensated, for example, by adjusting the laser power of light source 210 and using tracking module 215 to account for pupil size and / or an ambient light sensor to accommodate the expected pupil size.

[0068] The improved design can reduce the rotation of the projected image to 5.2°, which corresponds to a 0.65mm eyebox displacement in this embodiment. The total eyebox extension is now exemplarily 3.50+2*0.65=4.80mm, which does not take into account the additional extension of the defocused spot caused by lateral scanning.

[0069] An exemplary 0.65 mm eye-space displacement corresponds to a 3.1° eye rotation. Digital correction should take into account (5.2° - 3.1° = 2.1°). The field of view should therefore be increased to twice this value (i.e., approximately 5°). This is an acceptable compromise, as the scanning amplitude can be increased at the micromirror size and / or the illumination area projected onto the HOE plane can be correspondingly increased through appropriate design of the projection lens.

[0070] In summary, the data glasses and their optical systems described with reference to the above figures can be summarized as follows:

[0071] This invention relates to a system with an adaptive dynamic eyebox. The system can self-calibrate to the user's pupil position by determining the pupil position before projecting an image and moving the eyebox accordingly. During operation, the system tracks the pupil position, following the user's eye movements and providing natural vision, achieving optimal resolution in the central visual field. Another advantage of the present invention is that the expanded eyebox and pupil tracking allow the user to maintain unobstructed viewing even when their gaze changes. Furthermore, dynamic eye position matching can be achieved using MEMS systems, making them miniaturized and industrializable. Overall, the concept remains compact and can be integrated into small frame formats.

[0072] If an embodiment includes an "and / or" connection between a first feature and a second feature, it should be understood that an embodiment according to one embodiment has both the first feature and the second feature, while an embodiment according to another embodiment has only the first feature or only the second feature.

Claims

1. Data glasses (100) having an optical system (115) for projecting a projection image onto an imaging area (200) of an eye (205), wherein: The optical system (115) has the following characteristics: a light source (210) for outputting an image; a tracking module (215) for detecting a pupil position of a pupil (217) of an eye (205); an image forming module (220) for forming the output image into an image to be projected, wherein the image forming module (220) is configured to change an image plane of the image to be projected according to a pupil position detected by the tracking module (215); as well as A reflection module (225) is configured to project the image to be projected as a projection image into the imaging region (200) of the eye (205).

2. The data glasses (100) according to claim 1, wherein: The image forming module (220) is configured to change the image plane of the image to be projected by tilting and / or rotating an image forming module element (305).

3. The data glasses (100) according to any one of the preceding claims, wherein The image forming module (220) is configured to change the position of the imaging area (200) of the projected image.

4. The data glasses (100) according to any one of the preceding claims, wherein The image shaping module (220) is configured to change the extent of the imaging area (200) of the projected image.

5. The data glasses (100) according to any one of the preceding claims, wherein The image forming module (220) includes at least one movable lens element (310) and / or micromirror element (305).

6. The data glasses (100) according to any one of the preceding claims, comprising a focusing module (230) for focusing or defocusing the output image or the output image light and / or the image to be projected.

7. The data glasses (100) according to claim 1, comprising a mirror module (235) for deflecting the image to be projected onto the reflection module (225).

8. The data glasses (100) according to any one of the preceding claims, wherein The reflection module (225) is configured to have at least one holographic optical element.

9. The data glasses (100) according to any one of the preceding claims, wherein The optical system (115) is manufactured using MEMS technology.

10. Data glasses (100) according to any of the preceding claims, the data glasses being configured such that the convergence point (700a, 700b) moves behind the pupil plane (705) of the user, and / or the individual light rays are separated at one intersection point in the pupil plane of the user from the other intersection points, and / or wherein an adjustable focusing lens is provided or synchronized so as to defocus the light beam at a larger angle relative to the incident angle and / or to increase the lateral light beam size in the pupil plane of the user.

11. A method (400) for projecting an image onto an imaging area (200) of an eye (205), wherein: The method (400) comprises the following steps (405, 410, 415, 420): Output (405) image; detecting (410) the pupil position of the eye (205); shaping (415) the output image into an image to be projected, wherein an image plane of the image to be projected is changed according to the detected pupil position; as well as The image to be projected is projected (420) as a projection image into the imaging area (200) of the eye (205).

12. Computer program configured to execute and / or control the steps (405, 410, 415, 420) of the method (400) according to claim 11.

13. A machine-readable storage medium having stored thereon the computer program according to claim 12.

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