WO2016091743A1

WO2016091743A1 - Display devices

Info

Publication number: WO2016091743A1
Application number: PCT/EP2015/078642
Authority: WO
Inventors: Wolfgang Singer; Ersun Kartal
Original assignee: Carl Zeiss Smart Optics Gmbh
Priority date: 2014-12-12
Filing date: 2015-12-04
Publication date: 2016-06-16
Also published as: DE102014118490B4; DE102014118490A1

Abstract

Disclosed are display devices, in particular for augmented reality glasses. In said display devices, an optical arrangement (27) that is located within a visual range of an eye (12) is scanned using a laser scanner arrangement (24, 22).

Description

description

display devices

The present application relates to display devices, in particular for displaying data in a head-worn device (HWD), for example in so-called data glasses.

Data glasses are devices that are worn like conventional glasses on the head and on the one hand by the data glasses allow a view of the environment, but on the other hand, the viewing of mirrored data allows. The term "data" is to be understood here generally and may refer to symbols, characters, numbers, images, videos, etc. In other devices, only viewing of data is possible without the possibility of simultaneously viewing the environment.

FIG. 1 schematically shows a conventional display device for a device to be worn on the head, such as data glasses. FIG. 1 is a plan view of part of a head 10 of a user wearing such a device. With 1 1, the nose of the user is called. 12 denotes an eye, in the case shown in FIG. 1, the right eye of the user. The illustrated devices can be similarly applied to the left eye or both eyes. 18 designates a part of the device to be worn on the head, for example a part of a housing or a part of a spectacle lens in the case of data glasses.

15 designates an entrance pupil via which data to be injected is provided by an imaging device (for example a display) and directed to a region 17 of the part 18. The area 17 includes e.g. reflective and / or imaging elements to pass the data to be displayed to the eye 12. The region 17 may comprise, for example, a holographic reflector. With 13, an exit pupil of the illustrated optical system is referred to, which in this

For example, in typical applications, this exit pupil may have an extension of about 10 mm

Pupillenöffnung of the human eye, for example in a range of 0.5 to 3 mm This may mean that the eye 12 has to move in order to be able to observe the entire area of the exit pupil 13. Denoted at 19 is a half field of view angle (FOV) which typically can be achieved with such a construction, for example, approximately 15 degrees

Viewing direction (also called "line of sight", LOS), and 1 13 denotes one

Edge beam of the current line of sight. A line 1 10 shows a "main view direction" straight forward: an angle 1 1 1 between the line 1 10 and the view direction 1 15 can

for example, in the range 25 °. 1 12 and 1 14 denote a light path for a central part of the field of view in the representation shown, for example a region of the sharpest vision (foveal vision). It should be noted that the human eye sees only in a relatively small area of about 2 to 3 ° sharp, so that also for the field of view 19 eye movement may be required to see the entire displayed data sharply. For example, in the example shown in FIG. 1, a distance 16 between the entrance pupil 15 and the region 17 is about 30 to 40 mm, and a distance 14 of the pupil of the eye 12 and the exit pupil 13 from the region 17 of the part 18 is e.g. about 15 mm. A magnification factor between entrance pupil 15 and exit pupil 13 thus results after the set of rays. In the numerical examples given above, a magnification SYS would be in the range of 0.3 to 0.5, where S 'is the distance 14 and S is the distance 16. In the case of a dimension of the exit pupil 13 in the range of 10 mm would then be a

Extension of the entrance pupil 15 greater than 30 mm.

Therefore, an arrangement as shown in Figure 1 requires a relatively large amount of space, for example, to be able to illuminate a correspondingly large entrance pupil 15.

A solution for setting a desired magnification would be basically one

Telescope optics or the like to use. However, this would require additional space for additional optical components, which is difficult in some applications. In particular, an available space is limited in many applications, for example in the case of data glasses, which should be relatively slender, among other things, for aesthetic reasons. In addition, even with such a telescope optics of

Beam diameter set in the optics. In addition, it can be seen that a large field of view requires a correspondingly large exit pupil 13 (eyebox). From WO 2004/1 15095 a head-worn device using a holographic layer is known, which allows a relatively large field of view. However, a user must additionally wear a contact lens with this device, which could reduce the acceptance of such a device by customers.

It is therefore an object of the present application to provide display devices for head-worn devices such as data glasses, which require a small space and / or which allow a relatively large field of view. A display device according to claim 1 is provided. The subclaims define further embodiments.

According to the invention, a display device is provided, comprising:

a laser light source arrangement,

an optical to be arranged in a viewing area of an eye of a user

Arrangement for imaging light received from the laser light source array to the eye, and

a scanner mirror disposed between the laser light source array and the optical array for scanning the optical array with

Laser light source arrangement generated laser light.

By using a laser scanner system for image generation, a compact design is possible in some embodiments, since, for example, no extended display such as a display is needed.

The optical arrangement can be arranged in a spectacle lens.

The optical arrangement may comprise a holographic optical arrangement. The holographic element may comprise an optical element corresponding to an ellipsoidal mirror or an optical element corresponding to a hyperboloidal mirror.

The optical arrangement may also comprise a Fresnel element. The optical arrangement may also comprise a diffractive optical element. The optical arrangement may also comprise a reflective optical element.

The optical assembly may be segmented into a plurality of segments. The segments may be adjacent to each other, but also spaced from each other.

The laser light source arrangement may comprise a plurality of laser light sources for scanning different parts of the optical arrangement in parallel. Thus, a required modulation frequency can be reduced.

The different parts can correspond to different segments of the optical arrangement. The display device may further include a facet mirror for directing light from the laser light source assembly to the scanner mirror.

The optical assembly may be configured to increase an effective exit pupil. The display device may further comprise an optical element for directing laser light to the optical assembly, wherein the optical element is arranged to be illuminated at an angle of less than 30 °.

The optical element may comprise a holographic or diffractive optical element.

The holographic optical element may correspond to an ellipsoid

Hologram or a hyperboloid corresponding hologram.

The optical element may be movable to serve as another scanner mirror, e.g. to select one of the above-mentioned segments.

Further, a head-worn device (HWD) is provided with a display device as described above.

The device can be configured as a data glasses. By using two holographic elements, which are at an angle to each other, a compact structure can be achieved.

In particular, a relative large field of view can be achieved by using a Fresnel element or a segmented lens, and data can be selectively recorded at different points of the field of view.

Hereinafter, various embodiments of the present invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1 shows a display device according to the prior art, and

FIGS. 2 to 12 display devices according to various embodiments of the present invention.

In the following, various embodiments of the present invention will be explained in detail. These embodiments are merely illustrative and are not to be construed as limiting. For example, a description of a

Embodiment with a variety of features not that all these features are necessary to implement embodiments. Rather, some can

Features or elements may be omitted or replaced by alternative features or elements. In addition, additional features (not explicitly shown or described) or elements may be provided in addition to the illustrated features or elements. Features or elements of various embodiments may be combined to form further embodiments. For example, modifications and

Variations which are described for one of the embodiments, also applicable to other embodiments, unless otherwise specified.

In order to avoid repetition, in the following description corresponding elements at least partially bear the same reference numerals and will therefore not be explained in detail several times.

Fig. 2 shows a display device according to an embodiment in the form of a

Data glasses. The perspective of the illustration of FIG. 2 corresponds to that of FIG. 1 already explained at the beginning (ie essentially a view from above), where 10 is a user's head, 1 is the nose and 12 is an eye, in this case the right eye of FIG user, designated. Also in Fig. 2 is a momentary line of sight 1 15 with respect to a main direction of view 1 10, which would correspond to a straight line, offset by an angle 1 1 1. An angle 19 denotes a half view angle corresponding to the field of view. With 13 again an exit pupil (Eyebox) of the optical system is indicated on the eye 12.

In the embodiment of FIG. 2, a part of a data glasses with a spectacle lens 18 and a temple piece 29 is shown. In the eyeglass temple 20, a laser light source 24 and a movable scanner mirror 22 is arranged. By means of a movement of the scanner mirror, a desired image for displaying einzuspiegelnder data can be scanned, for example, by switching on and off, attenuating or dimming the laser light source 24 (which can be done for example by opening and closing a panel) different brightnesses of pixels, especially light and dark, can be generated. For color images, the laser light source 24 may include different colored lasers (e.g., red, green, and blue for RGB display).

The light reflected by the mirror 22 is incident at a "grazing" angle of incidence on a first optical element 21, which may in particular be a diffractive optical element and / or a holographic optical element

in particular less than 30 °, e.g. less than 20 ° or less than 10 °. The first optical element 21 forms a divergent beam generated by the laser light source 24, which is designated 25 in FIG. 2 by way of example and serves to generate a specific pixel, i. a certain position of the mirror 22 corresponds to a first virtual image of the respective object point. In the spectacle lens 18, a second optical element 27 is disposed in the region 17, which in turn may be, for example, a diffractive and / or holographic element. The second optical element 27 images the first virtual image of the object point onto a second virtual image, which can be viewed by the eye 12 at a predetermined distance, for example at infinity. Examples of this will be explained later with reference to FIGS. 3-5. By moving (tilting) the scanner mirror 22, the object point is virtually moved, resulting in a shift of the considered

Pixel leads, so as to be able to represent an entire desired field of view. By way of example, FIG. 2 shows a first beam 25 for a first mirror position and, in addition, a second beam 26 for a second mirror position, resulting in different pixels, which are then imaged onto different locations of a retina of the eye 12 as shown. Also in the embodiment of FIG. 2, for example, a field of view of a total of about 30 ° (corresponding to an angle 19 of about 15 °) can be achieved, with a more compact construction than in Fig. 1st Optionally, various correction elements may be provided in the embodiment of FIG. 2. By way of example, a correction element 23 is shown between the scanner mirror 22 and the optical element 21, which is used, for example, to correct

Field aberrations can serve. Also, one or more optical elements may be disposed between the laser light source 24 and the scanner mirror 22 to adjust or adjust a divergence of the light beam (eg, a divergence as shown in FIG. 2).

By providing the first optical element 21 in addition to an optical element 27 provided in the spectacle lens 18, in conjunction with the illustrated grazing incidence, a compact construction of the optics can be achieved. In particular, this optics can be accommodated as shown in a bracket 20 of a data glasses.

Now, referring to FIGS. 3 to 5, various will be described

Implementation examples for the first optical element 21 and second optical element 27 of FIG. 2 are explained.

In Fig. 3, a first holographic element 30 as a first optical element (for example, 21 in Fig. 2) and a second holographic element 31 as a second optical element (for example, 27 in Fig. 2) are provided. The first optical element 30 and the second optical element 31 essentially correspond in their function to ellipsoid mirrors. For this purpose, the holographic elements 30, 31 form, for example, respective interference patterns corresponding to segments of a multiplicity of ellipsoidal surfaces. Denoted at 32 is an ellipsoidal axis of the first holographic element 30, and at 33 an ellipsoid axis of the second holographic element 33. Denoted at 23 is again an optional correction element. Such a correction element may be advantageous because, for example, in a

Implementation, the mapping from F1 to F3 described may be an exact or optimized, but for example, by tilting a scanner mirror is not just a point, but to image an image area. In other words, points outside of F1 are also to be imaged, which can lead to aberrations which can then be corrected by the correction element 23. In the illustrated example, a virtual laser light source at F1 (which may be formed, for example, by a real laser light source in conjunction with a scanner mirror as shown in FIG. 2) is imaged by the first holographic element 30 onto a virtual image F2. The virtual image F2 is imaged by the second holographic element 31 onto a virtual image F3, which is then viewed by the eye 12. The points F1 and F2 represent foci of the first holographic element 30, and the points F2 and F3 represent foci of the second holographic element 31

Embodiment of Fig. 3, both holographic elements 30, 31 operate in reflection.

For example, the first holographic element 30 may be exposed by exposure of a corresponding photosensitive material at the position of the first

holographic element 30 is arranged, are generated with spherical waves starting from the points F2 and F1. Similarly, the second holographic element 31 may be formed by exposing a photosensitive material disposed in the position of the holographic element 31 to spherical waves emanating from F2 and F3. However, it is also possible to use any other conventional type of production method for such holographic elements, for example as in the initially discussed WO 2004/1 15095.

Another embodiment is shown in Fig. 4. In the embodiment of Fig. 4, a first holographic element 40 serves as a first optical element 21 and a second holographic element 31 as a second optical element 27. The holographic elements 40, 41 in this case are holographic elements corresponding to a hyperboloidal mirror. In particular, the holograms form interference fringes corresponding to segments of a number of hyperboloidal surfaces. 42 denotes a hyperboloid axis of the first holographic element 40, and 43 denotes a hyperboloid axis of the second holographic element 41.

The first holographic element 40 has foci F1 and F2, and the second holographic element 41 has foci F2 and F3. So is in the

Embodiment of FIG. 4 shows a virtual laser light source at F1 through the first

holographic element 40 mapped to F2. The image at F2 is further imaged by the second holographic element 41 on F3. Another embodiment is shown in FIG. In Fig. 5, a first holographic element 50 is provided as a first optical element 21, and a second holographic element 51 is provided as a second optical element 27. In the example of FIG. 5, the holographic elements 50, 51 are again Hyperboloid elements, and at 52 is a hyperboloid axis of the first holographic

Element 50 and 53 denotes a hyperboloid axis of the second holographic element 51. F1 and F2 again denote the foci of the first holographic element 50, and F2 and F3 the foci of the second holographic element 51. The structure of the holographic elements 50, 51 is substantially the same as explained with reference to FIG. In contrast to the structure of FIG. 4, the first holographic element 50 is now illuminated not in reflection, but in transmission from a virtual laser light source from the point F1, again optionally by a

Correction element 23. The illustrations of Figures 3 to 5 are merely examples of implementation with holographic elements, and others may be used

Implementations, such as combinations of a hyperboloid holographic element and an ellipsoidal holographic element, and holographic elements may generally operate in both transmission and reflection. In the embodiments discussed with reference to FIGS. 2 to 5, for example, fields of view with image angles in the range 25 to 30 ° corresponding to sizes of the exit pupil of the optical system (Eyebox) in the range of 8 to 10 mm or less are possible. The embodiments of FIGS. 2 to 5 allow a compact construction. Now further embodiments will be discussed which allow larger fields of view. For this purpose, techniques can be used, which are also called "Eyebox

An expander shown in Fig. 6 comprises a laser light source 24 from which a beam passes through an optical element 60 onto a scanner mirror 22. The optical element 60 For example, the optical element 60 may be formed by a lens or the like, for example with a focal length of the order of 20 mm, resulting in deflection angles of the order of 9 degrees to the

Scanner level 22 leads. Of the diverging bundle, a center ray 68 and marginal rays 69 are shown in FIG. For the sake of simplicity, the beam will hereinafter also be referred to as beam 69. The beam 69 optionally passes from the mirror 22 again through the optical element 60 (or through another optical element) to a diffuser 62. The diffuser 62 is arranged in the plane of an intermediate image. In the illustrated

Embodiment diffuses the diffuser 62, the light diffused in a certain angular range, for example in an angular range up to 10 °. Such a diffuser 62 can

For example, have frequencies corresponding to a period length of the order of 3 to 5 μηη. A spot size in the field plane, for example in the plane of the diffuser 62, is in the order of 10 to 30 μηη in embodiments. This can be achieved by appropriate design of the optical element 60, by an optional further diffuser 61 and / or a diffusion plate. Starting from the diffuser 42 is coupled into a spectacle lens 18, which serves as a light guide in this case (for example, by total reflection at the interfaces). In some embodiments, the spectacle lens 18 for this purpose in some areas, which, for example, outside a field of view, in the through the lens 18

should be seen through, are also coated accordingly to the

To increase reflectivity. Such coated areas may be provided, for example, at locations designated 610. In other embodiments, the photoconductive properties of the spectacle lens 18 are based only on a refractive index jump between the spectacle lens 18 and the environment (e.g., air). In this way, the light is guided to a Fresnel element 67, which acts as a beam expander and directs the light to the eye 12 of a user.

The decoupling via the Fresnel element 67 can be effected in particular in a cascaded manner, resulting in larger fields of view and larger diameters of the exit pupil

(Eyebox) can lead. This can be limited by a curvature of the spectacle lens 18. Such a curvature may, for example, have a radius of curvature in the range of 100 mm to 130 mm. The spectacle lens 18 may in the illustrated example have spherical front sides (facing away from the eye 12) and rear sides (facing the eye 12). This curvature limits the size of the eyebox. 66 denotes a field of view in FIG. 6, 61 1 denotes the viewing direction of the eye 12 in the position shown, and 65 denotes a main viewing direction (eg, straight ahead). To capture the entire field of view, for example, the eye 12 may be shown in simplified representation about a center of rotation 63, as indicated by an arrow 64, rotate. Systems with an embedded light guide in a spectacle lens 18 and a Fresnel element, such as the Fresnel element 67, are known per se and can For example, we are described in DE 10 2010 041343 implemented. Other implementations are possible.

By the arrangement of FIG. 6, a very compact implementation of

Display device can be achieved with a comparatively large field of view.

Another way to increase the field of view is to use a

Segmentation. The principle of such a segmentation is for example in the

DE 10 2013 207257 A1. Here the eyebox, i. the exit pupil, segmented into smaller segments, which for example have a diameter of about 0.6 mm to 1, 4 mm. Such diameters may be sufficient, for example, to represent conventional video signals such as VGA signals or HDTV signals. Each of the segments is assigned to a separate optical path. For example, a first distinct optic path may form a central eyebox segment in the center of the eyebox, and a second optic path separate therefrom may form an adjacent second segment of the eyebox. With a diameter between 0.6 mm and 1.4 mm as mentioned above, 2 to 5 such segments can be considered simultaneously by one pupil. Other sizes are possible. For segmentation, segmented optical elements such as prisms, which may additionally have properties of a lens, can be used. Each separate optical path forms in such embodiments only a part of the entire field of view. Together, all the separate optical paths form the image in the entire field of view, which can be viewed by a user, for example, by rotating and rotating the eye. In such embodiments, an effective pupil plane of a smaller dimension may be formed at a position between the pupil of the eye and the retina. A scanner mirror of a laser scanner may be in a conjugate plane to this

Pupil level, whereby the field can be illuminated by a scan. Corresponding embodiments will now be explained with reference to FIGS. 7 to 10.

Shown schematically in Figures 7A and 7B are implementations having a segmented optical element to explain some principles thereof. FIGS. 7A and 7B each show a segmented optic 74 with segments 74A to 74E. The segments 74A to 74E can, as explained above, eg elements such as prisms be, which also fulfill the function of lenses. In particular, microlenses, microprisms or combinations thereof can also be used as segmented optical elements. The number of 5 segments 74A to 74E in FIGS. 7A and 7B is merely an example, and a different number of segments may be used.

Shown at 76 in Fig. 7B is the above-mentioned smaller-dimension reflective pupil plane formed between the pupil of the eye and the retina. Denoted at 78 is a plane conjugate to this effective pupil plane 76. In FIG. 7, edge beams are shown starting from an element 70 and their image is shown in the plane 76 via the segmented optical elements 74A to 74E. As can be seen, this image has a smaller extent in the plane 76 than in the plane of the pupil of the eye 79. In FIG. 7B, the arrangement of FIG. 7A is substantially reproduced, an example of the element 70 being a scanner mirror 22 is shown. The scanner mirror is illuminated by an optical system 72 starting from a laser light source 73. As an example, edge beams for each of the optical segments 74A to 74E, which can be realized by different positions of the mirror 22, are shown in FIG. 7B. In addition, the image of these rays is shown up to a retina of the eye 12 out.

The radiation path, which is shown in FIGS. 7A and 7B, can also be folded (for example, by mirrors or other elements) in order to achieve a more compact construction.

Systems as shown in FIGS. 7A and 7B may be used in particular for head-mounted devices in which the user does not have to look through a lens or the like. In the embodiments of FIGS. 7A and 7B, the segmented optical

Elements 74A to 74E operated in particular in transmission, which makes a simultaneous view of the environment difficult for the structure shown in FIGS. 7A and 7B. In other embodiments, such segmented optical elements may also operate in reflection. Such embodiments are for example better for use in data glasses, wherein a user, for example, at least through areas that are not occupied by the segmented optical elements, see through. Embodiments of display devices using segmented optical elements in reflection will now be explained with reference to FIGS. 8 to 10. FIG.

FIG. 8 shows a system which, as a segmented optical element, has a series of reflective optical elements 80A to 80E. The reflective optical elements may, for example, be micromirrors, in particular micromill mirrors with an imaging function, as shown in FIG. The reflective optical elements 80A to 80E are arranged at a plane 81, for example in a part of a spectacle lens. For example, a user may see through at least one remaining portion of the lens. While five reflective optical elements 80A to 80E are shown in FIG. 8, this is merely an example, and more or less reflective optical elements may be provided.

The reflective optical elements 80A to 80E, also referred to as facets, are selectively illuminated by a laser light source 24 via a scanner mirror 22. Optionally, an optic 72 may also be provided corresponding to the optic 72 of FIG. 7B. With the

In some embodiments, scanner mirror may only ever illuminate a portion of one of the optical reflective elements 80A-80E, as indicated by the illustrated beams. Thus, for example, the individual reflective optical elements 80A-80B may be scanned in succession to produce respective sub-images. The eye 12 then sees a corresponding image of the respective reflective optical element 80A-80E as it looks in the corresponding direction. An alternative possibility of parallel illumination of various reflective optical elements will be explained later with reference to FIG.

In the embodiment of FIG. 8, the individual reflective optical elements 80A to 80E are arranged directly next to one another. It should be noted that in addition to a one-dimensional arrangement in a row, other arrangements, for example in a square or rectangle, are basically possible. In addition, an arrangement is possible in which the individual reflective optical elements are spaced apart, so on

various locations, for example, a spectacle lens data can be mirrored. This will be explained in more detail later with reference to FIGS. 11 and 12.

In particular, when operating with narrow-band laser sources, instead of reflective optical elements such as reflective microlenses with prismatic properties or inclined

Micro mirrors also diffractive or holographic optical elements can be used. One Example of this is shown in Fig. 9. In the embodiment of FIG. 9, the reflective optical elements 80A to 80E of FIG. 8 are replaced by a diffractive element, holographic element or Fresnel element 90. Otherwise, the equivalent

Operation of the embodiment of FIG. 9 basically that of the

Embodiment of Fig. 8. Such optical elements 90 may have the advantage that the optical properties of the element, i. the optical functionality provided by the element (in this case reflecting towards the eye 12) is separated from the outer shape of the optical element, so that, for example, a better fit to a spectacle lens shape is possible.

If, for the display of the mirrored data, a high repetition frequency of e.g. is desired for a scanner system with a single laser light source (possibly per color) and a corresponding mirror in embodiments as shown in FIGS. 8 and 9, a desired

Scanning speed of the scanner mirror and a modulation frequency of the laser light source (to represent different brightnesses) in the range of 20-200 MHz necessary, which is feasible with conventional techniques, but e.g. a high precision in the production needed. If, by introducing a time offset, distortion errors or other effects of time skew are to be compensated, then even higher

Modulation frequency are needed.

To reduce a required modulation frequency, you can do so

Embodiments, multiple laser light sources are used in parallel. One

corresponding embodiment is shown in Fig. 10. In the exemplary embodiment of FIG. 4, for example, 102 4 laser light sources are provided in parallel. Each of the

As already discussed, laser light sources can provide multiple lasers to provide a

Have multi-color representation, for example, in each case a red, a green and a blue laser for an RGB display. The number of 4 laser light sources in Fig. 10 is merely an example, and others

Embodiments, a different number of laser light sources can be used. The number of laser light sources may correspond to a number of segments of a segmented optical element. In the embodiment of FIG. 10, each laser light source is the

Laser light source assembly 102 associated with an optical element 100A to 100D. The Optical elements 100A to 100D may be at least partially reflective or diffractive optical elements and are disposed in a spectacle lens 18. In particular, elements 100A-100D may be configured as discussed with reference to FIGS. 8 and 9. 101 is a viewing direction.

Laser beams of the laser light assembly 102 are directed via a facet mirror 101 to a scanner mirror 22. The facet mirror 101 has a facet 101A-101D for each laser light source of the laser light assembly 102, which facets may be slightly offset with respect to each other, for example, to guide the laser beams via the scanner mirror to an associated optical element 100A-100D, respectively. When scanning with the scanner mirror 22, the optical elements 100A to 100D are then scanned in parallel, each from a laser beam. 101 denotes a viewing direction.

When the eye 12 looks in the direction of the corresponding optical element 100A to 100D, it sees the correspondingly reflected data there, for example images, characters and / or symbols. In particular, by an appropriate alignment of the eye, the corresponding optical element 100A to 100D can be viewed with the fovea of the eye, which corresponds to the area of the strongest vision. Optionally, an additional correction element (as with other

The number of four optical elements 100A-100D is also to be understood as an example here, and the number may vary. Other arrangements of the optical elements, for example a two-dimensional arrangement, are also possible. the number of

Laser light sources of the laser light source assembly 102 may then be adjusted accordingly. While a corresponding laser light source of the laser light assembly 102 is provided for each optical element 100A-100D in the embodiment of FIG. 10, in other embodiments, a laser of the laser light source arrangement may also be used to scan more than one optical element 100A-100D. For example, in another embodiment, the laser light source assembly 102 may include only two laser light sources, and each laser light source may then serve to scan 2 of the 4 optical elements 100A-100D. In general, a plurality of Laser light sources are provided in order to scan an area to be scanned in parallel.

In the embodiments discussed above, data is essentially mirrored onto a contiguous area, which area may optionally be segmented. In the latter case, the segments are adjacent to each other in the embodiments shown so far.

As already briefly mentioned, non-contiguous surfaces and / or spaced-apart segments are also possible. Corresponding embodiments will now be explained with reference to FIGS. 11 and 12.

Figs. 11A and 11B show an embodiment of a display device which is e.g. based on the embodiment of FIG. 3 and modified. Appropriate

Modifications may also be made in other embodiments, e.g. both

Embodiments of Figs. 4 and 5, are made.

In the embodiment of FIGS. 11A and 11B, in turn, light from one

Laser light source 74 is directed to a scanner mirror 22. From there, the light passes to a first holographic element 110, which, for example, can be configured essentially corresponding to the first holographic element 30 of FIG. 3 (or in another embodiment also corresponding to the first holographic element 40 of FIG. 4). In the embodiment of FIGS. 1A and 1B, however, the first holographic element 110 is also movable and serves, as it were, as a second scanner mirror. From the first holographic element 1 10, the light is further directed to a second holographic element 1 1 1, which is segmented in the example shown in three parts 1 1 1 A-1 1 1 C.

Apart from this segmentation, the second holographic element 1 1 1

for example, according to the second holographic element 31 of FIG. 3 (or the second holographic element 41 of FIG. 4). The segments 1 1 1 A-1 1 1 C may be much smaller than the holographic elements 31 or 41 of FIGS. 3 and 4.

A segment 1 1 1 A-1 1 1 C to be illuminated by the laser light source 24 can then be selected in the illustrated embodiment by a position of the first holographic element 110, this being illustrated in FIGS. 1A and 1B by way of illustration two different positions of the holographic element 1 10 are shown. Thus, in Fig. 1A just scanned the segment 1 1 1 B, while in Fig. 1 1 B just the segment 1 1 1 A is scanned, with the just rasterized segment can be adjusted by tilting the first holographic element 1 10. Each of the segments 1 1 1 A-1 1 1 C, for example, correspond to a small field of view, corresponding to an angle of 5-8 °, and each associated exit pupil (Eyebox) may have an extent of the order of 4 mm. However, these numerical values are only an example. The exit pupil is designated by 1 12 each. When the eye 12 moves in the direction of the corresponding segment 1 1 1 A-1 1 1 C, the data presented there can be viewed. The number of three segments 1 1 1 A-1 1 1 C is again to be understood as an example. With the technique shown in FIGS. 11A and 11B, multiple segments can thus be arranged over an entire possible field of view, for example a lens such as a spectacle lens (for example a medical (ophthalmological) spectacle lens for eye correction, a glass of sunglasses, etc.) , which corresponds to several possible exit pupils.

Another example of a spaced arrangement of segments is shown in FIG. The embodiment of FIG. 12 is based on the embodiment of FIG. 10, and corresponding elements bear the same reference numerals and will not be explained again.

While in the embodiment of FIG. 10, individual reflective optical elements 100A-100D are disposed adjacent to each other, in the embodiment of FIG. 12 reflective optical elements 120A-120D are spaced apart from one another. In the embodiment of Figure 12, multiple laser light sources are again provided for parallel scanning of elements 120A-120D. By appropriate adjustment of the facet mirror 101, spaced-apart reflective optical elements 120A-120D can also be scanned in parallel. Otherwise, the embodiment of FIG. 12 corresponds to that of FIG. 10, and modifications and variations discussed with reference to FIG. 10 are also applicable to the embodiment of FIG.

The illustrated embodiments are merely illustrative, and other arrangements are possible.

Claims

claims

Display device comprising:

a laser light source arrangement (24, 102),

an optical arrangement (27; 31; 41; 51; 67; 74; 80; 90; 100) to be arranged in a viewing area of an eye (12) of a user for imaging of the

Laser light source assembly (24; 102) towards the eye (12), and one between the laser light source assembly (24; 102) and the optical assembly (27; 31; 41; 51; 67; 74; 80; 90; 100; 1 1, 120) arranged scanner mirror for

Scanning the optical arrangement with laser light generated by the laser light source arrangement (24, 102).

A display device according to claim 1, wherein the optical assembly (27; 31; 41; 51; 67; 74; 80; 90; 100) is disposed in a spectacle lens (18).

A display device according to claim 1 or 2, wherein the optical arrangement comprises a holographic optical array (31; 41; 51).

A display device according to claim 3, wherein the holographic element comprises a

Ellipsoidspiegel corresponding optical element or a hyperboloid mirror corresponding optical element.

A display device according to any one of claims 1 to 4, wherein the optical assembly comprises a Fresnel element (67).

A display device according to any one of claims 1 to 5, wherein the optical arrangement comprises a diffractive optical element (90).

A display device according to any one of claims 1 to 6, wherein the optical arrangement comprises a reflective optical element.

A display device according to any one of claims 1 to 7, wherein the optical assembly is segmented into a plurality of segments (100; 1 1 1; 120).

9. Display device according to claim 8, wherein the segments (100) are arranged adjacent to each other. A display device according to claim 8, wherein the segments (1 1 1; 120) are spaced apart

are arranged to each other.

1 1. A display device according to any one of claims 1 to 10, wherein the

Laser light source arrangement comprises a plurality of laser light sources for parallel scanning of different parts of the optical arrangement.

12. Display device according to claim 1 1 and according to one of claims 8 to 10, wherein the different parts correspond to different segments of the optical arrangement. 13. The display device of claim 11 or 12, further comprising a facet mirror for directing light from the laser light source array to the scanner mirror.

14. Display device according to one of claims 1 to 13, wherein the optical arrangement is arranged to increase an effective exit pupil.

A display device according to any one of the preceding claims, further comprising an optical element (21; 30; 40; 50; 1 10) for directing laser light to the optical device, the optical element (21; 30; 40; 50; ) is arranged to be illuminated at an angle of less than 30 °.

16. A display device according to claim 15, wherein the optical element comprises a holographic or diffractive optical element.

A display device according to claim 16, wherein the holographic optical element comprises an hologram corresponding to ellipses or a hologram corresponding to hyperboloid.

A display device according to any of claims 15-17, wherein the optical element (110) is movable to serve as a further scanner mirror.

19. A head-mounted device with a display device according to one of claims 1 to 18.

20. The device according to claim 19, wherein the device is designed as a data glasses.