LENS FOR A DISPLAY DEVICE THAT CAN BE PLACED ON THE HEAD OF A USER AND PRODUCES AN IMAGE

Description

[0001] The present invention relates to a spectacle lens having the features of the preamble of claim 1 and to a display device having such a spectacle lens.

[0002] Due to the curved front and back surfaces, manufacturing such a lens with a light-guiding channel is difficult. In particular, producing a light-guiding channel that exhibits the desired optical properties is technically challenging.

[0003] WO 2004 / 001484 A1 describes a spectacle lens of the type mentioned above. FR 2 938 934 A1 discloses a one-piece spectacle lens having a recess extending from the edge surface into the spectacle lens, into which an insert serving as a light-guiding channel is inserted.

[0004] Based on this, it is therefore the object of the invention to further develop a spectacle lens of the type mentioned at the outset in such a way that it can be easily manufactured.

[0005] The object is achieved in a spectacle lens of the type mentioned at the outset in that the spectacle lens is constructed in several layers and has an outer layer and an inner layer connected to the outer layer, wherein a curved channel layer is arranged between the outer layer and the inner layer, said channel layer having a curved first reflection surface and a curved second reflection surface, wherein the light guide channel has at least a section of the channel layer and the two reflection surfaces at which the light beams are reflected for guidance from the coupling-in section to the coupling-out section.

[0006] This buried design of the two reflective surfaces ensures good guidance of the light beams, even if the front and / or back of the lens is dirty. Furthermore, the lens can be manufactured easily, as the first and second reflective surfaces can be formed, for example, on the channel shell, and the three shells can then be bonded together. This simplifies the manufacturing process.

[0007] In the spectacle lens according to the invention, the curved channel shell can be connected to the outer shell via the curved first reflection surface and to the inner shell via the curved second reflection surface.

[0008] However, it is also possible for the curved first reflection surface and / or the curved second reflection surface to be formed by an air gap between the channel shell and the outer shell and / or the inner shell. In this case, reflection can occur by total internal reflection. The curved first or second reflection surface is thus formed by the interface between the channel shell and the air gap. Preferably, the air gap is only present in the region of the light guide channel, and the channel shell is mechanically connected to the outer shell and / or the inner shell in regions adjacent to the light guide channel. This can be achieved, for example, by means of an optical putty or an optical adhesive.

[0009] In particular, the channel shell can be arranged as a spacer shell between the outer and inner shells, so that the outer and inner shells are not in direct contact. The channel layer is thus in full-surface contact with the outer shell via its first material interface and in full-surface contact with the inner shell via its second material interface. This results in a three-shell structure. Viewed from a top view of the spectacle lens, the outer shell, the channel shell, and the inner shell preferably have the same dimensions.

[0010] Furthermore, the first side of the outer shell facing away from the inner shell can form the front side of the spectacle lens and the first side of the inner shell facing away from the outer shell can form the back side of the spectacle lens.

[0011] Furthermore, the back surface can be curved to provide a corrective for refractive errors. This has the advantage that the outcoupled light beams also provide the desired refractive error correction, as they are decoupled in such a way that they exit the lens via the back of the inner shell.

[0012] With the spectacle lens according to the invention, the channel shell allows the guidance of the light beams to be optimized for a desired image. Independently of this, the desired refractive error correction can be optimized using the inner shell. Thus, with the spectacle lens according to the invention, the imaging properties, on the one hand, can be designed and adjusted via the channel shell, and the refractive error correction properties, on the other hand, can be designed and adjusted independently of each other via the inner shell.

[0013] Furthermore, the coupling-out section can be part of the channel shell. This further simplifies the manufacturability of the spectacle lens according to the invention.

[0014] Furthermore, the inner shell, the channel shell, and the outer shell can be formed from the same material. In this case, all three shells have the same refractive index. However, it is also possible for the channel shell to be formed from a different material than the inner and / or outer shell. In particular, all three shells can be formed from different materials.

[0015] Furthermore, the inner shell can be connected to the channel shell over a surface, and the channel shell can be connected to the outer shell over a surface. The shells can be glued or cemented together, for example.

[0016] Preferably, the mutually facing sides of the inner shell and channel shell, as well as the outer shell and channel shell, are complementary to each other. In particular, these mutually facing sides can be spherically curved.

[0017] Furthermore, the front and / or back can be spherically curved.

[0018] This multi-layer construction allows the thickness of the lens to be kept as low as possible. At the same time, the light guide channel can be designed to ensure the desired good imaging properties.

[0019] The output section can have several reflective deflection surfaces arranged side by side. The reflective deflection surfaces can also be referred to as reflective facets. They can have a reflectivity of almost 100%, in which case they are referred to as mirror surfaces. They can also have a lower reflectivity and thus be partially transparent.

[0020] The reflective deflection surfaces can be either flat or curved. Furthermore, the deflection surfaces can simulate a Fresnel-like curved reflection surface, which, in addition to pure beam deflection, also has imaging properties.

[0021] The coupling-out section can be buried in the lens and thus spaced apart from the front and back surfaces. In particular, the coupling-out section can be formed at a material interface of the channel layer or buried in the channel layer.

[0022] A phototropic layer can be formed on the front side. The phototropic layer can be designed as a passive layer or as an active layer.

[0023] The thickness of the channel shell can be greater in the area of the light guide channel than in the rest of the area. However, it is also possible for the channel shell to have a (substantially constant) thickness, or for the thickness of the channel shell to decrease in the direction from the input section to the output section.

[0024] The distance between the two reflection surfaces can decrease in the direction from the coupling section to the coupling section or can be constant.

[0025] Furthermore, at least one of the two reflective surfaces can have an imaging property. In particular, the imaging property can be determined by the curvature of the reflective surface.

[0026] At least one of the two reflection surfaces can have an interference layer system. The interference layer system can be formed from at least two different materials with different refractive indices. In particular, the interference layer system can comprise two, three, four, or five different materials. The refractive indices of the materials can range from 1.4 to 2.5 at a wavelength of 546 nm.

[0027] In particular, at least one of the two reflection surfaces can be designed such that it is transmissive for angles of incidence in the range from 0° up to a predetermined first critical angle of less than 90° and reflective for an angle of incidence greater than a predetermined second critical angle that is greater than or equal to the first critical angle. These transmission / reflection properties are preferably present for radiation in the visible wavelength range. The first critical angle can, for example, be in the range of 30°-60°, preferably in the range of 35°-45°. The second critical angle can, for example, be in the range of 45°-65°, preferably in the range of 50°-60°.

[0028] Furthermore, at least one of the two reflective surfaces can be designed as a partially reflective coating or as a reflective coating (mirror layer). A metallic coating, for example, can be used for this purpose. This essentially creates a kind of rear-surface mirror.

[0029] Furthermore, at least one of the two reflection surfaces can be configured to reflect light with a first polarization state and transmit light with a polarization state orthogonal thereto. In this case, the light beams are preferably generated such that they have the first polarization state.

[0030] The coupling section can be formed in an edge region of the lens, and the coupling section can be formed in a central region of the lens. The coupling can occur, for example, via the front side of the lens or via the back side of the lens.

[0031] The inner shell, the channel shell, and the outer shell can each be formed as a single piece. However, it is also possible for the inner shell, the channel shell, and / or the outer shell to be formed as multiple pieces.

[0032] Furthermore, a display device is provided with a holding device that can be placed on the head of a user, an image generation module that is fastened to the holding device and that generates an image, and an imaging optic that is fastened to the holding device and has a spectacle lens according to one of the above claims and that images the generated image when the holding device is placed on the user's head in such a way that the user can perceive it as a virtual image.

[0033] The imaging optics can comprise the spectacle lens as the sole optical element. However, it is also possible for the imaging optics to comprise at least one further optical element in addition to the spectacle lens. In particular, the outer shell can be formed integrally with the at least one further optical element. Alternatively, it is possible for the outer shell to be connected to the at least one further optical element (e.g., by cementing or gluing). Furthermore, the at least one further optical element can be spaced apart from the outer shell.

[0034] The at least one further optical element can be, for example, a collimation optic arranged between the spectacle lens and the image generation module, so that the light beams from the image generation module can be coupled into the spectacle lens as collimated beams.

[0035] Furthermore, the display device may comprise a control unit that controls the image generation module.

[0036] The image generation module can, in particular, comprise a planar image sensor, such as an LCD module, an LCoS module, an OLED module, or a tilting mirror array. The image sensor can comprise a plurality of pixels, which can be arranged, for example, in rows and columns. The image sensor can be self-luminous or non-self-luminous.

[0037] The image generation module can in particular be designed to generate a monochromatic or a multi-colored image.

[0038] The display device according to the invention may comprise further elements known to the person skilled in the art which are necessary for its operation.

[0039] 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.

[0040] The invention is explained in more detail below, for example, with reference to the accompanying drawings, which also disclose essential features of the invention. They show: Fig. 1 is a schematic perspective view of an embodiment of the display device according to the invention; Fig. 2 is an enlarged partial sectional view of the first spectacle lens 3 including a schematic representation of the image generation module; Fig. 3 is a representation of the transmissivity / reflectivity as a function of the angle of incidence; Fig. 4 is a schematic representation to explain the angle dependence of the reflection surfaces 24 and 25; Fig. 5 is a representation showing the layer sequence and the layer thicknesses of the interference layer system for the second reflection surface 24; Fig. 6 is the transmission behavior between the channel shell 21 and the outer shell 19 without an additional reflection surface; Fig. 7 is the transmission behavior between the channel shell 21 and the outer shell 19 with an additional reflection surface 24; Fig. 8 is the layer structure of the reflection surface according to the embodiment of Fig. 7 ; Fig. 9 the transmission behavior of another embodiment of the reflection surface in a spectacle lens according to the invention; Fig. 10 the layer structure of the reflection surface of the embodiment according to Fig. 9 ; Fig. 11 is an enlarged partial sectional view of a further embodiment of the first spectacle lens 3 including a schematic representation of the image generation module, and Fig. 12 is an enlarged partial sectional view of a further embodiment of the first spectacle lens 3 including a schematic representation of the image generation module.

[0041] At the Fig. 1 In the embodiment shown, 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 spectacle lens 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 spectacles for correcting ametropia, wherein a virtual image can be projected into the user's field of vision via the first spectacle lens 3, as described below.

[0042] For this purpose, the display device 1 comprises an image generation module 5, which can be arranged in the area of the right temple of the holding device 2, as shown in Fig. 1 is shown schematically. The image generation module 5 can be a planar image generation element 6 ( Fig. 2 ), such as an OLED, a CMOS or an LCoS chip or a tilting mirror matrix, with a large number of pixels arranged in columns and rows, for example.

[0043] The spectacle lenses 3 and 4, and in particular the first spectacle lens 3, are described only by way of example together with the display device 1 according to the invention. The spectacle lenses 3, 4, or at least the first spectacle lens 3, are each designed individually as a spectacle lens 3, 4 according to the invention or as an optical element according to the invention. The optical element according to the invention can also be used in a context other than with the display device 1 described here. Therefore, if the optical element is designed as a spectacle lens, it can of course also be designed as a second spectacle lens 4.

[0044] As best seen from the enlarged, schematic partial sectional view in Fig. 2 As can be seen, the display device 1 has an imaging optics 7, which contains an optical element 8 arranged between the image generating element 6 or the image generator 6 and the first spectacle lens 3. Furthermore, the first spectacle lens 3 itself also serves as part of the imaging optics 7.

[0045] A light beam 9 can emanate from each pixel of the imager 6. By appropriately controlling the pixels of the imager 6 by means of a control unit 10, which can be part of the image generation module 5, the desired image can be generated. Fig. 2 The beam path of a light beam is shown as a representative of the light bundles 9, so that the light beam 9 is also referred to below.

[0046] The light beam 9 emanating from the imager 6 passes through the optical element 8 and enters the first spectacle lens 3 via a coupling section 11 (here the front side of the first spectacle lens 3) and is guided therein along a light guide channel 12 to a coupling-out section 13. The coupling-out section 13 has a plurality of juxtaposed reflective deflection surfaces 14 (which can also be referred to as reflective facets), at which the light rays 9 are reflected toward a rear side 15 of the first spectacle lens 3, so that the light rays 9 exit the first spectacle lens 3 via the rear side 15.

[0047] Thus, when a user wears the display device 1 according to the invention on his head as intended, he can perceive the image generated by the image generator 6 as a virtual image when looking at the output section 13. In the embodiment described here, the user must look approximately 40° to the right relative to the viewing direction G of a straight-ahead view. Fig. 2 For clarity, the pivot point 16 of the user's eye and the eyebox 17 or exit pupil 17 of the imaging optics 7 are shown. The eyebox 17 is the area provided by the display device 1 and in which the user's eye can move while still being able to see the generated image as a virtual image.

[0048] Although in the described embodiment the coupling is carried out via the front side of the first spectacle lens 3 and thus the coupling section 11 is formed on the front side of the first spectacle lens 3, it is also possible to carry out a coupling via the back side 15 of the first spectacle lens.

[0049] As shown in the schematic diagram in Fig. 2 As shown, both the back 15 and the front 18 of the first spectacle lens 3 are curved.

[0050] The first lens is also, as shown in Fig. 2 can be seen, is designed in three shells and comprises an outer shell 19, an inner shell 20 and a channel shell 21 arranged between them.

[0051] The first side of the outer shell 19 facing away from the inner shell 20 forms the curved front side 18 of the first spectacle lens. The first side of the inner shell 20 facing away from the outer shell 19 forms the back side 15 of the first spectacle lens.

[0052] To form the light guide channel 12, a first reflection surface 24 is formed between the channel shell 21 and the outer shell 19, and a second reflection surface 25 is formed between the channel shell 21 and the inner shell 20. The two reflection surfaces 24, 25 extend from the coupling section 11 to the decoupling section 13. Thus, the light beams 9 can be guided by reflection at the reflection surfaces 24 and 25 from the coupling section 11 to the decoupling section 13, so that they can then be decoupled via the rear side 15 of the first spectacle lens after reflection at the reflective deflection surfaces 14.

[0053] The first and second reflection surfaces 24 and 25 can be formed, for example, on the channel shell 21. However, it is also possible for the first reflection surface to be formed on the outer shell 19 and the second reflection surface to be formed on the inner shell 20. As shown in Fig. 2 As indicated, the inner shell 20 and the channel shell 21, on the one hand, and the channel shell 21 and the outer shell 19, on the other hand, are in surface contact with one another. They can be glued or cemented together, for example. Therefore, one can also say that in the area of the light-guiding channel 12, the channel shell 21 is connected to the outer shell 19 via the first reflection surface 24, and that in the area of the light-guiding channel 12, the channel shell 21 is connected to the inner shell 20 via the second reflection surface 25.

[0054] The first and / or second reflection surfaces 24 and 25 can be, for example, a partially reflective coating or a reflective coating (mirror layer). A metallic coating, for example, can be used for this purpose. However, it is also possible to use a coating that is reflective for a first polarization state and transmissive for a polarization state orthogonal to it. In this case, the light beams 9 then exhibit the first polarization state, thus ensuring guidance in the light guide channel 12.

[0055] Furthermore, it is possible for the first and / or second reflection surfaces 24 and 25 to be designed as an interference layer system which has alternating thin layers with higher and lower refractive indices. In general, the interference layer system can be formed from k optical layers S 1 , S 2 , ... S k (k > 2) made of m materials M 1 , M 2 , ... M m (m > 2) which differ in terms of their refractive indices N 1 , N 2 , ... N m (m > 2). The refractive indices can, for example, be in the range from 1.4 to 2.5 at a wavelength of 546 nm. Such interference layer systems are generally known to those skilled in the art and can be optimized with regard to the desired optical properties. In the present embodiment, the interference layer systems are optimized with regard to the visible spectral range such that they are suitable for an angle of incidence α of 0° to approx.35° are transmissive (virtually 100% of the incident light is transmitted) and are reflective (almost 100% reflectivity) for an angle of incidence α in the range of 50° to 90°. In the transition range from 30° to 50°, the transmission changes from 100% to 0%.

[0056] In Fig. 3 The transmissivity along the y-axis is plotted in % versus the angle of incidence α in ° along the x-axis. Curve K1 shows the transmission and reflection behavior of the coating system for radiation with a wavelength of 400 nm. Curve K2 shows the behavior for radiation with a wavelength of 450 nm, and curve K3 shows the behavior for radiation with a wavelength of 680 nm.

[0057] In Fig. 4 This behavior is shown schematically again. The light beams 9 strike the corresponding reflection surface 24 and 25 at an angle of incidence α2 of greater than 50° (relative to the normal of the corresponding reflection surface 24, 25) and are therefore reflected. Ambient light 26, on the other hand, strikes the reflection surface 24, 25 at an angle of incidence α1 of less than 35° and is thus transmitted.

[0058] In this case in connection with Fig. 3 und 4 In the embodiment described above, it was assumed that the inner shell 20, the channel shell 21, and the outer shell 19 each have a refractive index of 1.81. For the interference layer system, two different materials with refractive indices N 1 = 1.787 and N 2 = 1.459 are used, where k is 113. Fig. 5 The corresponding structure of the second reflection layer 24 is shown schematically, with the thickness of the layer in nm being plotted along the x-axis (horizontal axis) and the refractive index being plotted along the y-axis (vertical axis).

[0059] Of course, the second reflection surface 25 can be designed in the same way as the first reflection surface 24 as an interference layer system according to Fig. 5 be trained.

[0060] If the refractive index of the channel layer 21 is greater than the refractive indices of the inner and outer layers 20, 19, total internal reflection can occur above a predetermined critical angle. For example, if the refractive index of the channel layer 21 is 1.81 and the refractive indices of the inner and outer layers 20, 19 are each 1.519, the critical angle is approximately 58°. The corresponding transmission behavior is shown in Fig. 6 schematically shown, with the angle of incidence in ° along the x-axis (horizontal axis) and the transmissivity in % along the y-axis (vertical axis). In this representation, in the same way as in Fig. 3 the curves K1, K2 and K3, which show the behavior for the wavelengths 400 nm, 450 nm and 680 nm.

[0061] If an interference layer system with two materials with refractive indices of 1.787 and 1.459 with 113 layers is provided, this can be Fig. 7 The transmission behavior shown can be achieved. The illustration in Fig. 7 corresponds to the representation in Fig. 6 . The transmission behavior for the wavelengths 400 nm (curve K1), 450 nm (curve K2) and 680 nm (curve K3) is also shown. From the comparison of the representation in Fig. 6 and 7It can be seen that light guidance is provided by reflection at the interference layer system up to an angle of incidence of 50° and thus by 8° more than without an interference layer system.

[0062] In Fig. 8 The structure of the corresponding interference layer system is the same as in Fig. 5 shown.

[0063] In a further embodiment, the interference layer system can comprise three different materials with refractive indices of 1.787, 1.459 and 2.472 and can be arranged between an outer shell 19 and a channel shell 21, each formed from a material with a refractive index of 1.62. In a layer system with 263 layers for the interference layer system, the Fig. 9 The transmission behavior shown can be achieved. The illustration in Fig. 9 corresponds to the representation in Fig. 7 . The transmission behavior is shown for the wavelengths 400 nm (curve K1), 450 nm (curve K2) and 680 nm (curve K3).

[0064] In Fig. 10 the layer structure is the same as in Fig. 8 shown.

[0065] The described three-layer structure of the first spectacle lens 3 provides the advantage that the guidance of the light beams 9 in the light guide channel 12 is independent of the cleanliness of the front and / or rear sides 18, 15 of the first spectacle lens. Thus, any contamination of the front 18 and / or rear 15 does not impair the guidance of the light beams 9 from the coupling section 11 to the output section 13.

[0066] Furthermore, the rear side 15 can have a curvature that corrects a user's visual impairment. Thus, the visual impairment can advantageously be corrected via the inner shell 20 and the light guidance via the channel shell 21, so that the visual impairment correction, on the one hand, and the light guidance, on the other, can be optically optimized independently of each other. Advantageously, the same channel shell 21 can always be used to adapt to different visual impairments. For this purpose, only an individual inner shell 20 needs to be provided and connected to the channel shell 21.

[0067] A phototropic layer can also be applied to the front side 18. Such a phototropic layer can be designed as a passive or active layer. This allows, for example, the spectacle lens according to the invention to be designed as a spectacle lens for sunglasses.

[0068] Furthermore, the user will advantageously perceive the output image via the rear side 15 adapted to him, so that he can perceive the virtual image sharply despite his visual impairment.

[0069] At the Fig. 2 In the embodiment shown, the thickness of the channel layer 21 is substantially constant.

[0070] However, it is also possible that the thickness of the channel layer decreases, particularly in the region of the light guide channel 12, in the direction from the coupling section 11 to the coupling section 13.

[0071] In particular, the thickness of the channel layer 21 in the areas next to the light guide channel 12 may be smaller than in the area of the light guide channel 12. Such a design is in Fig. 11 shown.

[0072] In the embodiments described so far, the channel shell 21 extends over the entire first spectacle lens 3. In this case, the channel shell 21 can also be referred to as a spacer shell, since it is always located between the inner shell 20 and the outer shell 19, so that the inner shell 20 is never in direct contact with the outer shell 19.

[0073] However, it is also possible that the channel shell 21 does not extend over the entire lens. In particular, the channel shell 20 may extend only in the area of the light-guiding channel 12. In this case, in the other areas where the channel shell 21 is not present, there may be direct contact between the inner shell 20 and the outer shell 19, as shown in Fig. 12 is shown.

[0074] The front and rear sides 18, 15 can each be spherically curved. The rear side 15 can also have an aspherical curvature. Furthermore, the two boundary surfaces of the channel shell 21 can also be spherically curved. In particular, the curvatures of the opposite sides of the corresponding shells 19, 20, and 21 are selected to be complementary, so that a surface contact can be established.

[0075] The material of outer shell 19, inner shell 20, and channel shell 21 is preferably the same, ensuring the same refractive index. However, materials with different refractive indices can also be selected for the individual shells 19-21.

[0076] 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, projection via the second spectacle lens 4 is also possible. Furthermore, the display device 1 can be designed such that information or virtual images are projected via both spectacle lenses 3, 4. The projection can be configured to create a three-dimensional image impression. However, this is not mandatory.

[0077] The spectacle lenses 3, 4 can have a refractive power of zero or a refractive power other than zero (in particular for correcting ametropia). As shown in the figures, both the front side 11 and the back side 12 of the spectacle lens 3 are curved. The front side 11 can, in particular, be spherically curved. If the spectacle lens has a refractive power other than zero in order to correct ametropia, the curvature of the back side 15 is generally selected accordingly to achieve the corresponding correction. The back side 15 can have a curvature that deviates from the spherical shape.

[0078] The holding device 2 does not have to be designed as a glasses-like holding device. Any other type of holding device is also possible, allowing the display device to be placed or worn on the user's head.

Claims

1. Spectacle lens for a display device (1) that can be fitted on the head of a user and generates an image, wherein the spectacle lens (3) comprises a curved front side (18) and a curved rear side (15), a coupling-in section (11) and a coupling-out section (13) spaced apart from the coupling-in section (11), as well as a light guiding channel (12) which is suitable for guiding light bundles (9) of pixels of the generated image, which are coupled into the spectacle lens (3) via the coupling-in section (11) of the spectacle lens (3), in the spectacle lens (3) to the coupling-out section (13), by which they are coupled out of the spectacle lens (3), wherein the spectacle lens (3) is constructed with several shells and comprises an outer shell (19) and an inner shell (20) which is joined to the outer shell (19), wherein a curved channel shell (21), which comprises a curved first reflecting surface (24) and a curved second reflecting surface (25), is arranged between the outer and inner shell (19, 20), and wherein the light guiding channel (12) comprises at least one section of the channel shell (21) and the two reflecting surfaces (24, 25) on which the light bundles (9) are reflected for guiding from the coupling-in section (11) to the coupling-out section (13), characterized in that the channel shell (21) does not extend over the entire spectacle lens (3) and in the areas where the channel shell (21) is not present, there is direct contact between the outer and inner shells (19, 20).

2. Spectacle lens according to claim 1, characterized in that the curved channel shell (21) is joined to the outer shell (19) via the curved first reflecting surface (24) and to the inner shell (20) via the curved second reflecting surface (25).

3. Spectacle lens according to claim 1 or 2, characterized in that the channel shell (21) extends only in the region of the light guide channel (12).

4. Spectacle lens according to one of the above claims, characterized in that the first side of the outer shell (19) facing away from the inner shell (20) forms the front side (18) of the spectacle lens (3) and the first side of the inner shell (20) facing away from the outer shell (19) forms the rear side (15) of the spectacle lens (3).

5. Spectacle lens according to one of the above claims, characterized in that the rear side (15) has a curvature which is chosen such that a correction of defective vision is brought about.

6. Spectacle lens according to one of the above claims, characterized in that the coupling-in section (11) is formed such that the coupling-in takes place via the curved rear side (15).

7. Spectacle lens according to one of the above claims, characterized in that the coupling-out section (13) is part of the channel shell (21) and / or that the inner shell (20), the channel shell (21) and the outer shell (19) are formed from the same material.

8. Spectacle lens according to one of the above claims, characterized in that the inner shell (20) is joined flat to the channel shell (21) and in that the channel shell (21) is joined flat to the outer shell (19).

9. Spectacle lens according to one of the above claims, characterized in that the coupling-out section (13) comprises several reflective deflecting surfaces (14) arranged next to each other.

10. Spectacle lens according to one of the above claims, characterized in that the coupling-out section (13) is formed buried in the spectacle lens (3) and is thus spaced apart both from the front side (18) and the rear side (15) and / or that a phototropic layer is formed on the front side (18).

11. Spectacle lens according to one of the above claims, characterized in that the thickness of the channel shell (21) is greater in the area of the light guiding channel (12) than in the remaining area.

12. Spectacle lens according to one of the above claims, characterized in that the distance between the two reflecting surfaces (24, 25) decreases in the direction from the coupling-in section (11) to the coupling-out section (13).

13. Spectacle lens according to one of the above claims, characterized in that at least one of the two reflecting surfaces (24, 25) has an imaging property.

14. Spectacle lens according to one of the above claims, characterized in that at least one of the two reflecting surfaces (24, 25) comprises an interference layer system and / or that at least one of the two reflecting surfaces (24, 25) is formed such that it is transmissive for an angle of incidence in the range of from 0° up to a predetermined first critical angle of less than 90° and is reflective for an angle of incidence greater than a predetermined second critical angle, wherein the second critical angle is greater than or equal to the first critical angle.

15. Display device with a holder (2) that can be fitted on the head of a user, an image-generating module (5) secured to the holder (2), which generates an image, and an imaging optical system (7) secured to the holder (2), which comprises a spectacle lens (3) according to one of the above claims and which, when the holder (2) is fitted on the head of the user, images the generated image in such a way that the user can perceive it as a virtual image.