WO2019011616A1

WO2019011616A1 - Projection device for a head-mounted display, head-mounted display, and method for operating a projection device

Info

Publication number: WO2019011616A1
Application number: PCT/EP2018/066623
Authority: WO
Inventors: Simone Hoeckh; Tobias Graf
Original assignee: Robert Bosch Gmbh
Priority date: 2017-07-12
Filing date: 2018-06-21
Publication date: 2019-01-17
Also published as: CN111051962A; EP3652581A1; CN111051962B; DE102017211932A1

Abstract

The invention relates to a projection device (100) for a head-mounted display. The projection device (100) has the following features: at least one light source (104) for emitting at least one light beam (106), at least one deflecting element which is arranged or can be arranged on a lens of the head-mounted display for projecting an image onto a retina of a user of the head-mounted display by deflecting and/or focusing the at least one light beam (106) onto an eye lens of the user, and at least one reflection element (112) for reflecting the light beam (106) onto the deflecting element (102). The projection device (100) additionally has at least one adaptive optical element (140) for adaptively modifying at least one beam parameter, wherein the at least one adaptive optical element (140) is arranged in the beam path between the at least one light source (104) and the at least one deflecting element. The invention further relates to a head-mounted display and to a method.

Description

description

title

The present invention relates to a projection device for smart glasses, data glasses, a method for operating a projection device, a computer program, a machine-readable storage medium and an electronic control device. State of the art

The development of helmet-mounted or head-mounted (HMD) or headworn displays (HWD) has been an active area of research since the 1960s. One feature is Virtual Reality (VR) systems. But above all, it is the development of augmented reality (AR) or mixed

Reality devices, the interesting possibilities for situational and individualized information provision in work and everyday life in perspective.

Due to high costs and bulky optics, HMDs are still used primarily in the military sector. However, also civilian professional groups and consumers in everyday life and leisure time of a handy and

benefit from low cost HM D device. But so far no one could

Consumer product in mass production successfully placed on the market. A big challenge here are e.g. mutually influencing requirements for the optical and mechanical specifications. There are currently two different types of HMDs on the market. On the one hand, these are lightweight, handy HMDs, whose imaging and sensory system is kept as small as possible, which is why they have only a limited

Have feature. On the other hand, there are HMDs with relatively bulky optics, possibly in combination with multiple sensors and cameras, which provide more sophisticated imaging and interactions between the Environment perception and the superimposed image information allow, but significantly larger, heavier and less ergonomic to handle.

One approach to realize sophisticated imaging with a space-saving design is a laser-based retinal scanner (retina scanner device = RSD). In contrast to most other concepts, this does not use an imaging optic, which is an image of a

Display area via an imaging system in the field of view of the user einblendet. Instead, at least one, at

Polychromatic systems also generated by means of multiple laser sources, a beam that can be directed through a MEMS (micro-electro-mechanical system) level and scanned by means of mirror deflection over the retina. By latency in the human visual system can thus be generated by targeted control of mirror and laser source, the impression of a flat image or superimposed image content. The advantage of this system concept is the low number of optical components, which also require only little space.

One way to realize a full color RSD is to use light of several colors, e.g. red, green and blue, to superimpose a beam that then falls on the MEMS mirror. Here is the switching of the individual

Light sources synchronized with the movement of the mirror.

One way to use the eye in every direction is to create multiple eyeboxes. This can e.g. through the use

wavelength-specific, applied to the spectacle lens deflecting elements can be achieved. For this purpose, per perceptible color, e.g. red, green and blue, as many different wavelengths are used as eyeboxes are to be created. The wavelengths for a color should be so similar that they are visually indistinguishable.

The human eye has its highest resolution only in the center of the sharpest vision. Only a very small angular range, which is imaged on the fovea, is really sharp. In the areas farther out in the field of view, the resolution is much lower. The depth perception of humans is based on different

Depth cues. In a conventional stereoscopic 3 D system, stereoscopy or binocular disparity, the offset of the image content on the left and right retina, is manipulated in order to create a certain depth impression. In general, but not all

Depth hints controlled accordingly, so that it can come to conflicting, confusing depth information. A prominent example is the Vergence accommodation conflict. The visual axes of the observer converge in the desired depth, but is always accommodated on the - possibly virtual - screen. The result is an unnatural visual situation, which, if it is too extreme, can be unpleasant and lead to an ambiguous perception of the displayed image information.

DE 10 2015 213 376 A1 discloses a projection device for data glasses, data glasses and a method for operating a

Projection device for a data glasses. The projection device comprises at least one light source for emitting a light beam and at least one arranged on a spectacle lens of the data glasses or can be arranged

A holographic element for projecting an image on a retina of a user of the data glasses by redirecting and / or focusing the light beam on an eye lens of the user.

Disclosure of the invention

The projection device for data glasses has at least one light source for emitting at least one light beam.

Under a data glasses, an HMD can be understood. The term data glasses should also be understood a video glasses, a helmet display or a VR helmet.

A light source may be understood to mean a light-emitting element such as a light-emitting diode, in particular an organic light-emitting diode, a laser diode or an arrangement of a plurality of such light-emitting elements. In particular, the light source can be designed to light to emit different wavelengths. The light beam can for

Serving a plurality of pixels serve on the retina, wherein the light beam, the retina, for example, in lines and columns or in the form of Lissajous patterns sweeps and can be pulsed accordingly. Under a spectacle lens can be understood a made of a transparent material such as glass or plastic disc element. Depending on

Embodiment, the spectacle lens may be formed approximately as a correction glass or a tint for filtering light of certain wavelengths such as

for example, have UV light.

A light beam can be understood in the paraxial approximation to be a Gaussian beam.

The projection device furthermore has at least one deflection element arranged or arrangeable on a spectacle lens of the data glasses for projecting an image onto a retina of a user of the data glasses by deflecting and / or focusing the at least one light beam on an eye lens of the user. The deflecting element may e.g. a holographic element or a freeform mirror.

By a holographic element, for example, a holographic-optical device, HOE for short, can be understood, which is e.g. can perform the function of a lens, a mirror or a prism. Depending on

Embodiment, the holographic element for certain colors and angles of incidence can be selective. In particular, the holographic element can fulfill optical functions that can be imprinted into the holographic element with simple point light sources. As a result, the holographic element can be produced very inexpensively.

The holographic element can be transparent. Thereby can

Image information to be overlaid with the environment.

By means of a holographic element arranged on a spectacle lens of a data goggle, a light beam can thus be applied to a retina of a wearer of the

Data goggles are directed that the wearer perceives a sharp virtual image. For example, the image may be scanned by scanning a laser beam a micromirror and the holographic element are written directly on the retina.

Such a projection device can be built in a small space

be realized comparatively inexpensive and makes it possible to bring a picture content in a sufficient distance to the carrier. This allows the contact-analogous superimposition of the image content with the environment. The fact that the image can be written directly onto the retina by means of the holographic element can be reduced to a flat display element, such as e.g. an LCD or DMD based system. Furthermore, a particularly large depth of focus can be achieved thereby.

In general, the deflection behavior on the surface of the holographic element is different at each point. As already mentioned above, it is generally not the case that the angle of incidence equals the angle of reflection. The portion of the surface of the holographic element which serves to redirect the light beam to the eye of a user is called a functional region

designated. In principle, the same applies to a free-form mirror as to a holographic element.

Furthermore, the projection device has at least one reflection element for reflecting the light beam onto the deflection element. Under a

Reflection element, for example, a mirror, in particular a

Micromirror or an array of micromirrors, or a hologram can be understood. By means of the reflection element, a beam path of the light beam can be adapted to given spatial conditions. For example, the reflection element can be realized as a micromirror. The micromirror can be designed to be movable, for example, have a mirror surface which can be tilted about at least one axis. Such a reflection element offers the advantage of a particularly compact design. It is also advantageous if the

Reflection element is formed to change an angle of incidence and, additionally or alternatively, a point of incidence of the light beam on the holographic element. As a result, the deflecting element can be swept over the surface, in particular approximately in rows and columns, with the light beam. Furthermore, the reflection element may be a mirror with a deformable surface. This has the advantage that the reflection element can not only deflect the light beam, but also change beam parameters. This can reduce the number of adaptive optical elements.

Furthermore, the projection device has at least one adaptive optical element for the adaptive change of at least one beam parameter, wherein the at least one adaptive optical element is arranged in the beam path between the at least one light source and the at least one deflection element.

An adaptive optical element can be understood as any optical element which is suitable for changing a beam parameter. In general, since an optical element can only slightly change a beam parameter at the location of the optical element, the term

Beam parameter in particular to understand a beam parameter at a location which lies after the optical element. Radiation parameters may include the following: Divergence angle or beam divergence, beam waist or beam diameter, and distance of the light beam to the optical axis. It should also be noted that a light beam is generally not rotationally symmetric. This means that the behavior of a light beam may be different in, for example, two mutually orthogonal directions. In general, therefore, a ray of light at one place becomes two

Shaft waists and two divergence angles described.

The adaptive optical element can be designed to be switchable. For example, a control unit may be provided which controls or regulates the adaptive optical element. In this case, the optical system can be actively adapted to different system configurations or also to different users.

The adaptive optical element may e.g. a lens with variable

Refractive properties, in particular a lens with variable

Focal length, a variable focal length liquid lens, a variable focal length telescope, a variable lens telescope, a variable reflectivity mirror, a mirror with deformable surface, a liquid crystal mirror, a liquid crystal display (SLM) or liquid crystal on silicon (LCoS) or a liquid crystal technology based SLM in reflection or be reflective. The telescope may, for example, have a Galilean or Keplerian arrangement.

For example, a variable focal length telescope can be realized by an ordinary telescope in which the distance of the lenses from each other can be varied. Alternatively or additionally, a focal length of one or more lenses can be changed. In addition, the shape of the lens may be asymmetrically variable, e.g. to compensate or bring about astigmatism.

The deformable surface mirror changes e.g. by applying an electrical voltage its surface shape. This changes the optical properties of the mirror, in particular the focal length. However, beamforming is also possible, i. a change in the beam profile. Such a mirror could be mounted in the optical path in front of the scanning micromirror. The scanning micromirror can also be further developed so that it additionally deforms itself in a controlled manner during the scan movement.

In the adaptive optical element also non-rotationally symmetric changes are possible, so that e.g. also beam forms and astigmatisms can be influenced. This can e.g. be realized by a liquid lens with segmented electrodes for astigmatic lens profiles.

It is preferred that only one reflection element is used for a projection device. This has the advantage that a simple structure can be used and the data glasses have a lightweight design.

According to one embodiment, the at least one reflection element is designed and set up to reflect the at least one light beam in such a way that the at least one light beam reaches an arbitrary point of one

Part of the deflection element impinges. Furthermore, the at least one reflection element is designed and set up, the at least one Reflect light beam so that the at least one light beam is scanned over a portion of the deflection. This advantageously achieves that the light beam can reach every point of the functional region. Preferably, the at least one reflection element is formed and arranged, the at least one light beam on the above

Scan partial area.

According to one embodiment, the at least one adaptive optical element is designed and set up to change at least one beam parameter of the at least one light beam as a function of a viewing direction of a user as well as a point of impact of the at least one light beam on the deflecting element. The advantages associated with this feature are very diverse. Advantageously, according to this embodiment, in the blurred

Seeing areas of the person or user the picture with a low

Resolution be transferred. This saves on the one hand advantageously

Resources in the image transmission and on the other hand, the image does not appear to a user worse than high-resolution transmission, since the user can not see clearly in these areas of vision anyway. For example, the low-resolution transmission may be accomplished by transmitting the light beam in the fuzzy viewing areas with fewer pixels each having a larger spot size. Since the solid angle range of the sharpest vision of the person depends on the viewing direction, according to this embodiment, where the human sees the sharpest, one can

Image high resolution, i. with more pixels and the smallest possible

Beam diameter or beam waist and where the human sees less sharp, the image less high resolution, i. with fewer pixels and a larger beam diameter or beam waist, transferred or scanned.

This feature also makes it possible to develop further functionalities. By setting the beam parameters, you can see the depth hint of the

Manipulate accommodation condition. Thus, a more convincing depth representation can be realized, which is a true, that is also adapted in depth, contact-analogue presentation and a more pleasant Viewing situation by reducing the Vergence accommodation conflict benefits.

According to a further embodiment, the adaptive optical element can be designed and set up such that at least one beam parameter of the at least one light beam is individually changed as a function of the respective user and his current viewing situation. For a user with a very high resolution visual system, i. With high eyesight, one can realize a different representation than for someone with reduced eyesight or partial vision loss.

According to a further embodiment, the adaptive optical element can be designed and set up in such a way that, depending on the

Brightness conditions in the environment of the user, i. depending on the brightness that the user sees through the data glasses, at least one

Beam parameter of the at least one light beam is changed.

According to a further embodiment, the adaptive optical element and the at least one light source are designed and set up such that an irradiation intensity at each point of the retina appears to be the same or bright for a user. It does not matter whether the light beam has a small or a large beam diameter. Furthermore, it must be considered that an identical irradiance could be perceived differently brightly by the individual human eye at different points of the retina.

According to a further embodiment, the projection device has at least one collimation element for collimating the at least one light beam which is emitted by the at least one light source. The collimation element is preferably arranged directly after the light source.

If several light sources are used, the number of light sources is

Kollimationselemente preferred identical to the number of light sources. In this case, it is further preferred that in each case a collimation element is arranged directly after each light source. According to a further embodiment, the projection device has at least one correction optics which does not improve the symmetry and / or reduce the spot size of the light beam

having rotationally symmetric optical element. The at least one correction optics is preferably arranged after the at least one collimation element. In the event that several light sources with different wavelengths are used, which are combined to form a light beam, the at least one correction optics is preferred before

Beam merging arranged. This has the advantage that the

Correction optics designed and optimized for one wavelength only.

According to a further embodiment, the at least one correction optics is arranged after the beam merging. This arrangement requires only a correction optics, which is designed and optimized for all wavelengths used.

If, in the case of the lens arrangement acting as a telescope, the distance of the lenses from one another changes, the beam shape changes. If it is to be possible to change only the diameter of the beam, but for each set distance to convert a collimated beam of one diameter into another collimated beam of another diameter, one or more of the lenses may have variable refractive properties. The changing of the distance between the lenses as well as the change of the refractive properties of the lens is synchronized with the mirror movement and depending on the pupil position and, where appropriate, the user and his situation.

As an adaptive optical element, for example, a refractive

Telescope, preferably with adaptive lens spacings for varying the beam diameter, and alternatively adaptive lenses, such as liquid lenses, or combinations of both approaches are inserted into the beam path. In this case, preferably in the case of a polychromatic system, a homogenization of the individual beam profiles by wavelength-specific correction optics before the merging of the beam paths followed by an adaptive wavelength-overlapping correction optics is used after merging the individual beam paths in order to save space and costs. Preferably, a wavelength-specific optical system is used for a monochromatic or quasi-monochromatic light beam. This is the case, for example, in the case of polychromatic systems, before beam collimation at the individual light sources. For a polychromatic light beam, optics adapted to the wavelengths used are preferably used.

This optics can also be called across wavelengths. This is the case with polychromatic systems after beam collation.

As a correction optics or as an adaptive optical element can also be a

Liquid lens can be used with segmented electrodes. This has the advantage that astigmatisms can be generated or compensated. Another advantage is that the focal length of the liquid lens is variable, i. that a change of the beam parameter can be controlled or regulated. According to a further embodiment, the projection device has three monochromatic light sources for emitting a respective light beam, the three light sources each having different wavelengths. The three different wavelengths of the three light sources preferably form an RGB color space. An RGB color space is an additive color space that absorbs color perceptions by the additive mixing of three primary colors, e.g. Red,

Green and blue, replicating. The three different wavelengths are suitable for giving a user an impression of additive color mixing. This embodiment has the advantage that with these three

Light sources a complete color space is spanned.

The three light beams are preferably merged into a single light beam. For combining the light beams of the three light sources, an optical waveguide with diffractive coupling elements or dichroic mirrors is preferably used.

Each beam path of the three light beams preferably has at least one adaptive optical element. Here, under a beam path, the path from the light source to the place where the light beam is absorbed to understand. Thus, the at least one adaptive optical element, if it is arranged after a beam merging of the three light beams, may also be only one. This advantageously achieves that for everyone Beam of light a beam parameter can be changed. Particularly preferably, each beam path of the three light beams has exactly one adaptive optical element.

Before merging the light beams of the three light sources, wavelength-specific optics are preferably used for each light beam. After merging the light beams of the three light sources, wavelength-overlapping optics are preferably used for the merged light beam.

The at least one adaptive optical element is preferably arranged after merging the light beams of the three light sources. This has the advantage that a simple construction can be realized.

The invention further comprises a data glasses. This has a spectacle lens and a projection device described above, wherein the deflecting element is arranged on the spectacle lens.

The invention further comprises a method for operating a

Projection device. According to the method, at least one

Beam parameter of the at least one light beam both in dependence of a line of sight of a user as well as a function of a point of impact of the at least one light beam changed on the deflecting. The change is preferably made by the at least one adaptive optical element. The associated advantages have already been set out above.

The at least one beam parameter of the at least one light beam is preferably changed as a function of an image content.

The invention further comprises a computer program which is set up to carry out the described steps of the method in order to be able to carry out the method described above with this computer program. Furthermore, the invention comprises a machine-readable storage medium, on which such a computer program is stored, as well as a

electronic control unit necessary to carry out the steps of

is set up. Such an electronic Control unit can, for example, as a microcontroller in a

Projection device or data glasses to be integrated.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

FIG. 1 shows a schematic representation of a projection apparatus according to an embodiment;

FIGS. 2 to 4 show schematic representations of a method for operating a projection apparatus according to an embodiment in each case;

FIGS. 5 to 11 each show a schematic illustration of a scanner optics of a projection apparatus according to an embodiment; and

FIG. 12 shows a schematic isometric view of data glasses according to one embodiment.

Embodiments of the invention

FIG. 1 shows the basic mode of operation of the projection device 100. The projection device 100 has a scanner optics 152 and a deflecting element, which in this embodiment is designed as a holographic element 103. The holographic element 103 is attached to a lens 402. The scanner optics 152 is arranged in a housing 105 and has a light source, a collimation element and a reflection element, which are not shown in FIG. Different embodiments of the scanner optics 152 are shown in FIGS. 5 to 12.

A light beam 106 emitted by the scanner optics 152 is transmitted through a

Exit window 148 in the direction of the deflecting 102 sent. The deflected by the deflection element 102 light beam 106 then strikes an eye lens 108 of a user, from where the light beam 106 on the retina 110 of a Eyeball 107 is focused. The scanner optics 152 is in an am

Eyeglass frame 120 and the eyeglass temple 118 attached housing 105 arranged.

FIG. 2 shows a scan path 122 of a light beam scanned over a deflection element 102, which results when a projection device according to FIG

Method according to one embodiment is operated. FIG. 2 shows what illumination the deflection element 102 experiences when a light beam is scanned over the surface of the deflection element 102, and during scanning the beam diameter is changed as a function of the point of impingement of the light beam on the deflection element 102. In the present case, the scan path 122 starts in the upper left corner of FIG. 2 and ends in the lower left corner. In the top line of the scan path 122, the light source 104 is turned off. Only in the second line of the scan path 122 is the

Light source 104 respectively at the centers of the circles shown

turned on, so that there are a number of large spots 124. After this

At the end of the second row, the light source is switched off again and only turned on again in the fourth row at the small spots 126. In the fifth line, the light source is turned on at the center of the large spots 124 and at the center of the small spots 126, respectively. The thus described scan path 122 is formed in the region in which the image is formed by the small spots 126

High resolution image area and in the region where the image is formed by the large spots 124, a low resolution image area. The illumination illustrated in FIG. 2 is preferably selected when the viewing direction of a user extends from the pupil to a point in the middle of the image area with high resolution. When a gaze tracking system detects that the user is looking at another point on the diverter 102, the illumination of the diverter 102 is adjusted to provide a high resolution around the area the user is looking at. This is illustrated in FIG. 3, where a user looks further to the left in comparison with FIG. 2, so that the high-resolution region is further to the left than in FIG. 2.

The size of the area, which is displayed in high resolution, depends on the area of sharp vision of the human, that is, on the anatomy of the human. Areas on the deflection element 102, which a person can not see clearly, are illuminated with a low resolution. FIG. 4 shows an illumination of a deflecting element 102 with two

Image areas of high resolution. This can be used for generating depth impressions or for marking objects or image contents as well as for directing the viewing direction. To simplify the illustration, two symmetrical beams with different beam diameters are shown here. However, more than two different beam diameters can be used. The scan path 122 can also be chosen differently. The change of the beam parameter is effected by an adaptive optical element.

FIG. 5 shows a scanner optics 152, which is held in a housing 105. The scanner optics 152 forms together with the not shown

Deflection element, a projection device 100, as shown in Figure 1. The light source 104 emits a light beam 106 which passes through the

Collimating element 114 is collimated. The collimated light beam 106 then strikes an adaptive optical element 140. For reasons of

Clarity, the light beam 106 is not shown after the Kollimationselement 114 in Figures 5 to 11.

The adaptive optical element 140 is designed and set up, both as a function of a line of sight of a user and as a function of a point of incidence of the at least one light beam 106 on the deflecting element to change a beam parameter of the light beam 106.

After the light beam 106 has passed through the correcting optics 116, it strikes a reflection element 112 and is guided by it through an exit window 148 in FIG

Direction of a mounted on a spectacle lens deflecting reflected. The correction optics 116 depicted in FIG. 5 are designed for only one wavelength, namely those used by the light source 104. The correction optics 116 shown in the figure description can be used for

Example cylindrical lens pairs, be spherical or aspherical lenses. The optical properties of these correction optics 116 are not changeable. According to further embodiments, the optical properties of the correction optics 116 are variable. FIG. 6 differs from FIG. 5 in that a telescope 154 for beam widening or beam reduction is arranged between the adaptive optical element 140 and the reflection element 112. Since the telescope 154 varies beam parameters, the telescope 154 is also an adaptive optical element 140. The telescope 154 may be in addition to beam expansion or

Beam Reduction also achieve astigmatic changes in beam parameters. According to another embodiment, the arrangement of the adaptive optical element 140 and the telescope 154 may be reversed. According to yet another embodiment, between the

Kollimationselennent 114 and the reflection element 112 two adaptive optical

Elements 140 arranged.

FIG. 7 shows a scanner optics 152 for a polychromatic system with three different light sources 104. The three different light beams 106 each pass through a collimation element 114 and a correction lens 116, and are then combined by means of two dichroic mirrors 150 into a merged beam 106, which first points to a Telescope 154 for beam expansion or beam reduction and then an adaptive optical element 140 hits. According to another embodiment, the arrangement of the adaptive optical element 140 and the telescope 154 may be reversed.

According to a further embodiment, between the dichroic mirrors 150 and the reflection element 112, only an adaptive optical element 140 or a telescope 154 for beam widening or beam reduction is arranged.

FIG. 8 shows a similar scanner optics as in FIG. 7, but differs in the beam merging of the polychromatic system.

The three light beams 106 with different wavelengths are coupled in accordance with Figure 8 by means of two diffractive coupling elements 158 in a light guide 156. The merged light beam 106, after exiting the light guide 156, first strikes an adaptive optical element 140 and then a telescope 154 for beam broadening or beam reduction. According to another embodiment, the arrangement of the adaptive optical element 140 and the telescope 154 may be reversed. According to yet another embodiment, between the light guide 156 and the

Reflection element 112 two adaptive optical elements 140 arranged. According to a further embodiment, only an adaptive optical element 140 or a telescope 154 for beam widening or beam reduction is arranged between the end of the light guide 156 and the reflection element 112.

FIG. 9 shows a scanner optical system 152 for a monochromatic system with a light source 104. After the collimation element 114, the light beam 106 first strikes a correction optical system 116 and then a telescope 154

Beam expansion or beam reduction. According to another

Embodiment may be the arrangement of the correction optics 116 and the telescope

154 be reversed.

FIG. 10 shows a scanner optics 152 for a polychromatic system, in which the beam merging is identical to that in FIG

Scanner optics 152 taken in another housing 105. The light guide 156 guides the merged beam to a deflection prism 160, in which the light beam 106 is deflected twice, so that it then has a reverse propagation direction. Thereafter, the deflected light beam 106 hits first on a telescope 154 for beam expansion or beam reduction and then on a reflection element 112, from where it exits through an exit window 148 from the housing 105. According to another embodiment, the telescope 154 is replaced by one or two adaptive optical elements 140.

According to yet another embodiment, a telescope 154 for beam widening or beam reduction and an adaptive optical element 140 is arranged between the deflection prism 160 and the reflection element 112.

According to yet another embodiment, the arrangement of the adaptive optical element 140 and the telescope 154 may be reversed.

FIG. 11 shows a scanner optics 152 for a polychromatic system, in which the beam merging is identical to that in FIG

Scanner optics 152 taken in another housing 105. The

merged light beam 106 strikes after the two dichroic mirrors 150 initially on another collimating element 114 and is then coupled into a light guide 156. After the light guide 156, the light beam 106 is deflected twice in a deflection prism 160. After that, the diverted meets

Light beam 106 first on a telescope 154 for beam expansion or Beam reduction and then on a reflection element 112, from where it exits through an exit window 154 from the housing 105. Since FIG. 11 shows an identical structure to the deflecting prism 160 as in FIG. 10, the embodiments disclosed in connection with FIG. 10 can also be applied to FIG.

FIG. 12 shows a schematic illustration of a data goggle 400 with a projection device 100 according to one exemplary embodiment. The

Projection device 100 in this case has a scanner optics 152 and the deflecting element 102. The scanner optics 152 is arranged in the housing 105 and transmits a light beam 106, not shown, through the appearance window 148 onto the deflection element 102. The data spectacle 400 has a spectacle lens 402 on which the deflection element 102 is arranged. For example, the deflecting element 102 is realized as part of the spectacle lens 402. Alternatively, the deflecting element 102 is realized as a separate element and connected to the spectacle lens 402 by means of a suitable joining method.

Claims

claims

A projection device (100) for data glasses (400), wherein the

Projection device (100) has the following features:

at least one light source (104) for emitting at least one light beam (106);

at least one deflection element (102) arranged or arrangeable on a spectacle lens (402) of the data glasses (400) for projecting an image onto a retina (110) of a user of the data glasses (400) by deflecting and / or focusing the at least one

Light beam (106) to an eye lens (108) of the user; and at least one reflecting element (112) for reflecting the

Light beam (106) on the deflecting element (102);

marked by

at least one adaptive optical element (140) for the adaptive change of at least one beam parameter, wherein the at least one adaptive optical element (140) in the beam path between the at least one light source (104) and the at least one

Deflection element (102) is arranged.

2. Projection device (100) according to claim 1, characterized

marked that

the at least one reflection element (112) is designed and set up, the at least one light beam (106) so to

reflect that the at least one light beam (106) incident on any point of a portion of the deflection element (102).

3. projection device (100) according to claim 1 or 2,

characterized in that

the at least one adaptive optical element (140) is designed and set up,

both at least one beam parameter of the at least one light beam (106) to change depending on a viewing direction of a user as well as a function of a point of impact of the at least one light beam (106) on the deflecting element (102). Projection device (100) according to one of the preceding claims, characterized by at least one collimation element (114) for collimating the at least one light beam (106) emitted by the at least one light source (104).

Projection device (100) according to one of the preceding claims, characterized by at least one correction optics (116), which has a non-rotationally symmetrical optical element for improving the symmetry and / or for reducing the spot size of the light beam.

A projection apparatus (100) according to any one of the preceding claims, characterized in that the adaptive optical element (140) comprises a variable refractive index lens, a variable focal length liquid lens, a variable focal length telescope, a variable telescope

Lens distances, a mirror with variable

Reflective properties, a mirror with deformable surface or a liquid crystal mirror, a liquid crystal display or based on liquid crystal technology SLM in reflection.

Projection device (100) according to one of the preceding claims, characterized in that the projection device (100) has three light sources (104) for emitting a respective light beam (106), wherein the three light source (104) each have different wavelengths and the three different wavelengths of the three light sources (104) form an RGB color space.

Data glasses (400) with the following features:

a spectacle lens (402); and

a projection device (100) according to one of claims 1 to 7, wherein the deflecting element (102) is arranged on the spectacle lens (402).

A method of operating a projection apparatus (100) according to any one of claims 1 to 8, the method comprising the step of: Changing at least one beam parameter of the at least one light beam (106) both as a function of a viewing direction of a user and as a function of a point of impact of the at least one light beam (106) on the deflecting element (102).

10. Computer program which is set up the steps of a

To carry out the method of claim 9.

11. Machine-readable storage medium on which a

Computer program according to claim 10 is stored.

12. Electronic control device which is adapted to perform the steps of the method according to claim 9.