Display device

Abstract

The invention relates to a display device comprising a holding device (2), which can be placed onto the head of a user, an image generating module (5) secured to the holding device, and a spectacle lens (3, 4) secured to the holding device (2), said spectacle lens imaging an at least two-colored in such a way that the user can perceive it as a virtual image, wherein the image generating module has – a first image generator (6) for a first color sub-image, – a second image generator (7) for a second color sub-image, and – a combiner (15) comprising a first and a second entrance surface (31, 32) and an exit surface (36), wherein the first color sub-image enters via the first entrance surface (31) and is guided along a first color channel as far as a first reflection layer (34, 35), which reflects one of the two color sub-images and transmits the other of the two color sub-images, (34, 35), wherein the second color sub-image enters via the second entrance surface (32) and is guided along a second color channel as far as the first reflection layer (34, 35), wherein the two color sub-images are superimposed by means of the first reflection layer (34, 35) to form the at least two-colored image, which exits via the exit surface (36) of the combiner (15) and is guided to the spectacle lens (3, 4), wherein the first entrance surface (31) is designed, and / or in the first color channel a first hologram is designed, such that a first imaging function is present for the first color sub-image and this function serves to correct an aberration caused by the spectacle lens (3, 4).

Description

[0001] Display device

[0002] The present invention relates to a display device comprising a holding device that can be placed on the head of a user, an image generation module that is attached to the holding device and that generates an at least two-color image, and a spectacle lens that is attached to the holding device and that images the generated at least two-color image when the holding device is placed on the head in such a way that the user can perceive it as a virtual image.

[0003] Such display devices are often referred to as smart glasses, which, in addition to the normal functionality of glasses, also feature an additional light path that can project a virtual image onto the wearer. Such display devices are designed to display a multicolored virtual image with high image quality while being as lightweight as possible.

[0004] It is therefore an object of the invention to further develop a display device of the type mentioned at the outset in such a way that the requirements mentioned at the outset are met as well as possible.

[0005] The invention is defined in claim 1. Advantageous further developments are specified in the dependent claims.

[0006] The display device comprises a holding device that can be placed on the head of a user, an image generation module fastened to the holding device, which generates an at least two-color image, and a spectacle lens fastened to the holding device, which images the generated, at least two-color image when the holding device is placed on the head such that the user can perceive it as a virtual image. The image generation module can have a first image generator that generates a first color image of the at least two-color image, and a second image generator that generates a second color partial image of the at least two-color image, as well as a combiner that comprises a first and a second entrance surface, at least one first reflection layer that reflects one of the two color partial images and transmits the other of the two color partial images, and an exit surface.The first color partial image enters the combiner via the first entrance surface and is guided along a first color channel to the first reflection layer. Furthermore, the second color partial image enters the combiner via the second entrance surface and is guided along a second color channel to the first reflection layer. The combiner superimposes the two color partial images using the first reflection layer to form an at least two-color image, which exits via the exit surface of the combiner and is guided to the spectacle lens. The first entrance surface is designed and / or a first hologram is designed in the first color channel such that a first imaging function is present for the first color partial image, which serves to correct an aberration caused by the spectacle lens.

[0007] This allows the desired correction to be performed on a color-by-color or color-selective basis. Since the necessary combiner only needs to be adapted by forming the first entrance surface and / or the first hologram in the first color channel, higher image quality can be achieved without the increased weight that would be associated with providing additional elements.

[0008] At the first reflection layer, one of the two color partial images can be reflected, whereas the other of the two color partial images can be transmitted, so that an overlay to at least a two-color image can be achieved.

[0009] The first entrance surface can be curved and / or have a geometric structure to achieve the first imaging function for the first color partial image. The second entrance surface can be flat and / or free of any geometric structure.

[0010] The corrected aberration can in particular be a longitudinal chromatic aberration and / or a transverse chromatic aberration.

[0011] The curvature of the first entrance surface can be a spherical curvature, an aspherical curvature, or a toric curvature. Furthermore, the first entrance surface can have a curved freeform surface that is neither spherically, aspherically, nor toricly curved. The geometric structuring can, in particular, be a geometric structuring that results in a diffractive grating.

[0012] Furthermore, the second entrance surface can be configured and / or a second hologram can be configured in the second color channel such that a second imaging function is present for the second color partial image, which serves to correct the aberration caused by the spectacle lens. The second entrance surface can be curved and / or have a geometric structure to effect the second imaging function for the second color partial image.

[0013] Furthermore, the image generation module can have a third image generator that generates a third color partial image of the at least two-color image. In this case, the at least two-color image is preferably designed as an at least three-color image. The third color partial image enters the combiner via a third entrance surface and is guided along a third color channel to a second reflection layer of the combiner. The second reflection layer is reflective for a first wavelength range and transmissive for a second and a third wavelength range. In this case, the first reflection layer is preferably reflective for, for example, the second wavelength range and transmissive for the first and third wavelength range.The first wavelength range can correspond to the first color partial image, the second wavelength range can correspond to the second color partial image, and the third wavelength range can correspond to the third color partial image. The wavelength ranges are preferably selected such that the desired superposition of the three color partial images can be achieved to produce an at least three-color image. For example, the three wavelength ranges can be selected to suit a red, a green, and a blue color partial image.

[0014] The third entrance surface can be configured and / or a third hologram can be configured in the third color channel in such a way that a third imaging function is present for the third color partial image, which serves to correct the aberration caused by the spectacle lens. In particular, the third entrance surface can be curved and / or have a geometric structure to effect the third imaging function for the third color partial image. However, it is also possible for the third entrance surface to be flat and free of any geometric structure.

[0015] The curvature of the second entry surface and the curvature of the third entry surface can be designed or developed in the same way as the curvature of the first entry surface. Furthermore, the geometric structuring of the second entry surface and the geometric structuring of the third entry surface can be designed or developed in the same way as the geometric structuring of the first entry surface.

[0016] The first reflection layer can be formed as a first dichroic layer, which reflects one color partial image from the group of the first and second color partial images and transmits the other color partial image. Furthermore, the combiner can have a second dichroic layer (e.g., the second reflection layer), which reflects one color partial image from the group of the second and third color partial images and transmits one color partial image. Furthermore, the first dichroic layer can

[0017] Layer can transmit or reflect the third color image and can reflect the second dichroic

[0018] Layer transmits or reflects the first color image.

[0019] In particular, the two dichroic layers can intersect at a 90° angle and be arranged in a beam combining cube (also called an X-cube). A beam combining cube, for example, is a dichroic prism cube in which four right-angled prisms are combined to form a cube such that the first and second dichroic layers intersect at a 90° angle.

[0020] The first and second dichroic layers (or the first and second reflective layers) can also be spaced apart from each other or aligned parallel. In this case, the combiner can be implemented as a prism rod (also called a rod combiner or rod combiner) comprising several parallelepiped prisms arranged one behind the other, with the dichroic layers arranged on the corresponding sides of the parallelepiped prisms. With such an arrangement, one can essentially add another color to the multicolor image with each additional parallelepiped prism.

[0021] The beam path from the first imager to the first entrance surface may be free of imaging optical elements. The same applies to the beam path from the second imager to the second entrance surface and to the beam path from the third imager to the third entrance surface.

[0022] However, it is also possible that at least one optically imaging element is arranged in at least one of the beam paths from the respective imager to the respective entrance surface.

[0023] Furthermore, the exit surface of the combiner can be flat. However, it is also possible to design the exit surface of the combiner as curved. In this case, the curved exit surface of the combiner represents an additional degree of design freedom for the imaging of the at least two-color image. This use of the exit surface reduces the requirements for the other optical surfaces for guiding and outputting the at least two-color image as a virtual image.

[0024] The spectacle lens can have a front side, a back side, an entrance section, a deflection section spaced from the entrance section, an exit section in the back side, and a light guide channel. The spectacle lens can guide the at least two-color image, which is coupled into the spectacle lens via the entrance section of the spectacle lens, through at least one reflection to the deflection section, which deflects the at least two-color image toward the exit section such that the at least two-color image exits the spectacle lens via the exit section.

[0025] The deflection section and the exit section can be spatially separated sections. In this case, the deflection section can deflect the at least two-color image toward the exit section, through which the at least two-color image then exits the spectacle lens. However, it is also possible for the deflection section and the exit section to coincide spatially, e.g., if the deflection section is designed as a surface grating.

[0026] The deflection section can have a single reflective, refractive, and / or diffractive deflection element or several reflective, refractive, or diffractive deflection elements arranged next to one another. With several deflection elements arranged next to one another, a desired deflection function and, if appropriate, an imaging function of the deflection section can be realized, e.g., in a Fresnel-like manner (this can of course also be realized with a single deflection element). The deflection elements can be reflective, refractive, and / or diffractive surface pieces, which can also be referred to as reflective, refractive, and / or diffractive facets. The reflective, refractive, and / or diffractive surface pieces can each be flat. However, it is also possible for the reflective, refractive, and / or diffractive surface pieces themselves to be curved.They can, for example, be spherically or aspherically curved, or even be designed as a curved freeform surface. Similarly, the single reflective, refractive, and / or diffractive deflecting element can be flat or curved. The reflectivity of the respective reflective deflecting element (or of the single reflective deflecting element) can, for example, be in the range of 1–100% (including the limits of the range) for the respective wavelength or color of the generated image. Thus, the reflective deflecting elements can, for example, be partially reflective or reflective. In particular, the deflecting element(s) can also have an imaging function in addition to their beam deflection function.

[0027] Since the outcoupling deflection section should be as invisible as possible and also impair the light coming from the environment to the viewer's eye as little as possible, deflection sections are generally preferred that have a high transmission in transparent form and thus a low reflectivity for the light bundles to be coupled out of the generated (preferably at least two-color) image. Common values ​​for the ratio of reflection to transmission are, for example, less than or equal to 50% to greater than or equal to 1% (e.g., any values ​​from this range in 1% steps), and in particular, for example, 50%, 40%, 30%, 20%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2% or 1%, evenly distributed over the visible length range.

[0028] The entrance section, like the deflection section, can have a single reflective, refractive, and / or diffractive entrance element or several reflective, refractive, or diffractive entrance elements arranged side by side. The entrance element(s) can be further developed in the same way as the deflection elements. In particular, the entrance element(s) can effect beam deflection and / or have an imaging function.

[0029] The exit section can, in the same way as the deflection section, have a single reflective, refractive, and / or diffractive exit element or several reflective, refractive, or diffractive exit elements arranged side by side. The exit element(s) can be further developed in the same way as the deflection elements. In particular, the exit element(s) can effect beam deflection and / or have an imaging function.

[0030] The spectacle lens may, in particular, have a curved rear side and / or a curved front side. The entrance portion may be formed in the rear side.

[0031] The at least two-color image is preferably guided to the deflection section by one or more reflections (in particular total internal reflections). The one or more reflections or total internal reflections can be caused, for example, at the front and / or back of the spectacle lens. However, it is also possible for at least one of the reflections or total internal reflections to be caused by a layer buried in the spectacle lens, which is spaced apart from the front and back.

[0032] The display device may include a control unit that controls the image generation module. In particular, the control unit may control the image generation module based on supplied image data.

[0033] The imagers can be designed as planar imagers. The respective imager can comprise an LCD module, an LCoS module, an OLED module, a pLED module, or a tilting mirror matrix. Each imager can comprise a plurality of pixels, which can be arranged, for example, in rows and columns. Each imager can be self-luminous or non-self-luminous, for example. Each imager can preferably generate a monochromatic image, with different imagers generating monochromatic images with different wavelengths (and thus color partial images). At least one imager can also be designed to generate a multicolored image (and thus a multicolored color partial image).

[0034] The image generation module can thus comprise, for example, a combination of two or more monochromatic imagers or a combination of a duochromatic imager and a monochromatic imager.

[0035] The color partial images can be, for example, a red, a green, or a blue color partial image. At least one additional color partial image can also be generated with a different wavelength, such as from the IR range.

[0036] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

[0037] The invention is explained in more detail below using exemplary embodiments with reference to the attached drawings, which also disclose features essential to the invention. These exemplary embodiments are for illustrative purposes only and are not to be interpreted as restrictive. For example, a description of an embodiment with a large number of elements or components should not be interpreted to mean that all of these elements or components are necessary for implementation. Rather, other embodiments may also contain alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different embodiments may be combined with one another unless otherwise stated. Modifications and variations described for one of the embodiments may also be applicable to other embodiments.To avoid repetition, identical or corresponding elements in different figures are designated by the same reference numerals and are not explained more than once. The figures show:

[0038] Fig. 1 is a schematic perspective view of an embodiment of the display device according to the invention;

[0039] Fig. 2 is an enlarged partial sectional view of the first spectacle lens including a schematic representation of the image generation module; Fig. 3 is an enlarged representation of the image generation module according to another embodiment;

[0040] Fig. 4 is an enlarged view of the image generation module according to another embodiment, and

[0041] Fig. 5 is an enlarged view of the image generation module according to another embodiment.

[0042] In the embodiment shown in Fig. 1, the display device 1 according to the invention comprises a holding device 2 which can be placed on the head of a user and which can be designed, for example, in the manner of a conventional spectacle frame, as well as a first and a second pair of spectacle lenses 3, 4 which are fastened to the holding device 2. The holding device 2 with the spectacle lenses 3, 4 can be designed, for example, as sports glasses, sunglasses, and / or glasses for correcting ametropia, wherein the user can have a virtual image projected into his field of vision via the first spectacle lens 3, which is designed as a spectacle lens according to the invention and which can also be referred to as a multifunctional lens, as described below.

[0043] For this purpose, the display device 1 comprises an image generation module 5, which can be arranged in the region of the right temple of the holding device 2, as is shown schematically in Fig. 1. The image generation module 5 can have a first image generator unit 6 for generating a red partial image, a second image generator unit 7 for generating a green partial image and a third image generator unit 8 for generating a blue partial image, as is shown schematically in Fig. 2. For this purpose, each of the image generator units 6 - 8 comprises a planar image generation element 9, 10 or 11. Each of the planar image generation elements 9 - 11 can have, for example, an OLED element, an LCD element, an LCoS element, a pLED module or a tilting mirror matrix, each of which comprises a multiplicity of pixels arranged, for example, in rows and columns.For the light beams emitted by the planar image generating elements 9 - 1 1 (and thus for the corresponding color partial image), a single light beam L1, L2 and L3 is shown schematically.

[0044] Of course, the specific arrangement of the first imaging unit 6 for generating the red partial image, the second imaging unit 7 for generating the green partial image, and the third imaging unit 8 for generating the blue partial image is only exemplary. The three imaging units 6-8 can also be arranged in any desired manner. For example, the first and third imaging units 6, 8 can be arranged in an interchangeable manner.

[0045] As can be further seen from Fig. 2, the image generation module 5 further comprises a superimposition element 15 or a combiner 15 (here in the form of a beam splitter cube) and an image module optics 16. The image module optics 16 can also be omitted or integrated in the first spectacle lens 3. Furthermore, a control unit 17 with, for example, a processor P and a memory M is provided for controlling the image generation module 5. The control unit 17 controls the image generation module 5 and in particular the image generation elements 9 - 11 as a function of supplied image data such that the color partial images generated by means of the three image generation elements 9 - 11 result in a multi-color image for a viewer in accordance with the image data when superimposed.For this purpose, the light beams L1-L3 of the three planar image-generating elements 9-11 are superimposed by the superposition element 15 to form a common light beam L4, which passes through the image module optics 16 and enters the lens 3 via a curved rear side 18. The entrance area at the rear side 18 can also be referred to as the entrance section 19. If the image module optics 16 is part of the lens 3, the first surface of the image module optics 16 onto which the light falls is the entrance surface or entrance section 19.

[0046] The first spectacle lens 3 further comprises a curved front side 20 and a deflection section 21 buried in the first spectacle lens 3.

[0047] The deflection section 21 comprises a reflective deflection structure 22 with a plurality of reflective deflection elements 23, which can also be referred to as reflective facets.

[0048] As already described, the light beams L1 - L3 enter the first spectacle lens 3 as a common light beam L4 via the entrance section 19 in the rear side 18. The common light beam L4 is then guided in the first spectacle lens 3, e.g. by total internal reflection at the rear side 20 and front side 18, to the deflection section 21, so that a light guide channel 29 is present from the entrance section 19 to the deflection section 21. The deflection section 21 deflects the common light beam L4 towards the rear side 18 in such a way that the deflected common light beam L4 exits the first spectacle lens 3 via the rear side 18. The area via which the common light beam L4 exits can also be referred to as the exit section 26.

[0049] The image generation module 5 and the first spectacle lens 3 are designed such that a user wearing the display device 1 according to the invention on his head can perceive the multi-colored image generated by the image generation module 5 as a multi-colored virtual image.

[0050] When guiding the common light beam L4 (and thus the partial color images) in the first spectacle lens 3, aberrations (e.g. longitudinal and / or transverse color errors) can occur, for example due to the coupling via the curved entrance section 19 at the curved rear side 18 and due to the total internal reflections at the curved front side 20 and the curved rear side 18, which are wavelength-dependent and therefore different for the partial color images (e.g. in the actual size or in the actual course of the aberration), which can lead to undesirable image errors that are perceptible to the user.

[0051] In order to correct these wavelength-dependent aberrations, the combiner 15 is specially designed as described below.

[0052] The combiner 15 comprises a first, a second and a third entrance surface 31, 32, 33, each of which is curved, a first and a second dichroic splitter layer 34 and 35 and an exit surface 36, wherein the red color partial image (light beam L1) enters the combiner 15 via the first entrance surface 31, the green color partial image (light beam L2) via the second entrance surface 32 and the blue color partial image (light beam L3) via the third entrance surface 33 and travels to the dichroic splitter layers 34 and 35. In a variant not shown, only one of the three entrance surfaces 31-33 is curved and the two remaining entrance surfaces 31-33 are flat. In a further variant not shown, exactly two of the three entry surfaces 31 -33 are curved and the remaining entry surface 31 -33 is flat.

[0053] The first dichroic splitter layer 34 reflects the red color partial image (light beam L1) and transmits the green color partial image (light beam L2) and the blue color partial image (light beam L3). The second dichroic splitter layer 34 reflects the blue color partial image (light beam L3) and transmits the red color partial image (light beam L1) and the green color partial image (light beam L2). As a result, the three color partial images (light beams L1-L3) are superimposed to form the multicolor image and exit the combiner 15 via the exit surface 36.

[0054] The area of ​​the combiner 15 from the first entrance surface 31 to the first dichroic splitter layer 34 can be referred to as the first color channel (here, the red color channel). Similarly, the area of ​​the combiner 15 from the second entrance surface 32 to the first and second dichroic splitter layers 34 and 35 can be referred to as the second color channel (here, the green color channel), and the area of ​​the combiner 15 from the third entrance surface 33 to the second dichroic splitter layer 35 can be referred to as the third color channel (here, the blue color channel).

[0055] As is shown in a greatly exaggerated and schematic manner in Fig. 2, the first and third entrance surfaces 31 and 33 are, for example, concavely curved and the second entrance surface 32 is convexly curved. However, this is purely an example. For example, all three entrance surfaces can also be concavely or convexly curved. Furthermore, for example, only one or two of the three entrance surfaces 31-33 can be concavely or convexly curved. An important point in the possible curvature of at least one of the entrance surfaces 31-33 is that with the appropriately curved entrance surface 31-33, wavelength-dependent aberrations occurring due to the light guidance in the first spectacle lens 3 can be corrected in a wavelength-selective manner (here for the red, green and blue color partial images).

[0056] The curvature of the corresponding entrance surface 31-33 can be spherical, aspherical, or toric, for example. A curved freeform surface is also possible that has neither spherical nor aspherical curvature.

[0057] The curved entrance surface(s) 31-33 thus allow color aberrations, in particular, to be corrected individually for each color. This is particularly advantageous in conjunction with the first spectacle lens 3, since the first spectacle lens 3 (e.g., monolithic) is made of a single material, so it is not possible to correct color aberrations by selecting achromatic material combinations.

[0058] In addition, as shown in the embodiment of Fig. 3 (where only the image generation module 15 is shown enlarged), the exit surface 36 can be curved (in contrast to the embodiment of Fig. 2, in which the exit surface 36 is flat). The exit surface 36 represents an additional interface and thus an additional design degree of freedom for the multi-color image. By using the exit surface 36 as an interface that has an imaging effect (due to the curvature of the exit surface 36), the requirements for the remaining optically effective surfaces of the first spectacle lens 3, such as the requirements for the deflection section 21, are relaxed.

[0059] In the embodiment of Fig. 4, the entrance surfaces 31-33 are not curved but are flat and simultaneously geometrically structured to provide a diffractive imaging function. One could also say that the entrance surfaces 31-33 each have a diffraction grating. These diffraction gratings have, for example, the same optical imaging function as the curved entrance surfaces 31-33 shown in Fig. 2.

[0060] In the embodiment of Fig. 5, the entrance surfaces 31-33 are not curved but flat. Furthermore, holograms 31', 32', and 33' are formed in the color channels, which provide the desired imaging functions for the color partial images.

[0061] Depending on the reflectivity of the deflecting elements 23, the user can perceive the virtual image superimposed on the surroundings. With very high reflectivity, and in particular with a reflectivity of 100%, the user can perceive only the virtual image and not the surroundings, at least in the area of ​​the deflecting section 21, if a certain distance between the deflecting elements 23 is not exceeded. If the certain distance between the deflecting elements 23 is exceeded, ambient light can reach the eye unhindered between them, so that even with 100% reflectivity of the deflecting elements 23, a view of the surroundings is possible, resulting in a quasi-perforated / segmented 100% mirror.

[0062] The first deflection structure 22 can provide pure beam deflection. Preferably, it can also provide an imaging effect.

[0063] In the display device 1 according to the invention, the virtual image is projected into the user's field of vision via the first spectacle lens 3. Of course, it is also possible to project it via the second spectacle lens 4. Furthermore, the display device 1 can be designed such that information or virtual images are projected via both spectacle lenses 3, 4. The projecting can be done in such a way that a three-dimensional image impression is created. However, this is not absolutely necessary.

[0064] The spectacle lenses 3, 4 can have a refractive power of zero or a refractive power other than zero (in particular for correcting a visual impairment). In particular, both the front side 20 and the back side 18 can be curved. The front side 20 is in particular spherically curved. If the spectacle lens 3, 4 has a refractive power other than zero in order to correct a visual impairment, the curvature of the back side 18 is generally selected accordingly to achieve the corresponding correction. The back side 18 can have a curvature that deviates from the spherical shape.

Claims

Patent claims 1. Display device with a holding device (2) that can be placed on the head of a user, an image generation module (5) that is fastened to the holding device (3) and that generates an at least two-color image, and a spectacle lens (3, 4) that is fastened to the holding device (2) and that displays the generated at least two-color image when the holding device (2) is placed on the head in such a way that the user can perceive it as a virtual image, wherein the image generation module - a first image generator (6) which generates a first color partial image of the at least two-color image, and - a second image generator (7) which generates a second color partial image of the at least two-color image, - a combiner (15) comprising at least a first and a second entrance surface (31, 32), at least one first reflection layer (34, 35) which reflects one of the two partial color images and transmits the other of the two partial color images, and an exit surface (36), wherein the first partial color image enters the combiner (15) via the first entrance surface (31) and is guided along a first color channel to the first reflection layer (34, 35), wherein the second partial color image enters the combiner (15) via the second entrance surface (32) and is guided along a second color channel to the first reflection layer (34, 35), wherein the combiner (15) superimposes the two partial color images by means of the first reflection layer (34, 35) to form an at least two-color image, which exits via the exit surface (36) of the combiner (15) and is guided to the spectacle lens (3, 4) is guided,wherein the first entrance surface (31) is designed and / or a first hologram is designed in the first color channel such that a first imaging function is present for the first color partial image, which serves to correct an aberration caused by the spectacle lens (3, 4).

2. Display device according to claim 1, wherein the first entrance surface (31) is curved and / or has a geometric structure in order to effect the first imaging function for the first color partial image.

3. Display device according to claim 1 or 2, wherein the second entrance surface (32) is designed and / or a second hologram is designed in the second color channel in such a way that a second imaging function is present for the second color partial image, which serves to correct the aberration caused by the spectacle lens (3, 4).

4. Display device according to claim 3, wherein the second entrance surface is curved and / or has a geometric structure in order to effect the second imaging function for the second color partial image.

5. A display device according to any one of the above claims, wherein the combiner (15) comprises a second reflection layer (34, 35) which is reflective for a first wavelength range and transmissive for a second wavelength range.

6. Display device according to claim 5, wherein the two reflection layers (34, 35) intersect at an angle of 90° and are arranged in a beam combining cube.

7. Display device according to one of the above claims, wherein the beam path from the first image generator (7) to the first entrance surface (31) is free of imaging optical elements.

8. Display device according to one of the above claims, wherein the exit surface (36) of the combiner (15) is curved.

9. Display device according to one of the above claims, in which the spectacle lens (3, 4) has a front side (20) and a back side (18), an entry section (19) and a deflection section (21) spaced from the entry section (19), an exit section (26) in the back side (18) and a light guide channel (29) which guides the at least two-colour image, which is coupled into the spectacle lens (3) via the entry section (19) of the spectacle lens (3), in the spectacle lens (3) by at least one reflection to the deflection section (21), from which the at least two-colour image is deflected in order to exit the spectacle lens (3) via the exit section (26).

10. Display device according to claim 9, wherein the deflection section (21) has a plurality of reflective, refractive and / or diffractive deflection elements (23) arranged next to one another. 11 . Display device according to one of the above claims, wherein the aberration caused by the spectacle lens (3, 4) is a longitudinal chromatic aberration and / or a transverse chromatic aberration.

Images