DE102016205700A1 - Stereoscopic display device - Google Patents

Abstract

The invention relates to a stereoscopic display device for a vehicle. It comprises a display medium having a surface from which a plurality of light channels extend into the display medium and a set of first light sources and a set of second light sources. The light sources are arranged to emit light through an associated first or second light channel along a radiation direction into an outer environment of the display support. The light channels are arranged in light channel pairs so that the emission directions of both light channels of each light channel pair intersect in a virtual light spot outside the light sources. The display medium is intransparent and designed as a parallax barrier, which causes the light emissions from the light channels to be imaged in a specific, "outer-area" usable area ("eye-box") that a human observer whose eyes pair in the usable space, with one eye the light emissions from the first light channels, but can not perceive those from the second light channels, and reversed with his other eye, so that there is a stereoscopic image of the virtual light points.

Description

The present invention relates to a stereoscopic display device, in particular an instrument display unit for a vehicle, as well as a vehicle having such a display device.

In modern vehicles, especially motor vehicles, it is common to use analog or digital display devices to provide the driver or other occupants of the vehicle information, in particular the operating condition of the vehicle or the current ride. For example, pointers or digital digits have been used for a long time to indicate the current speed of travel, speed, remaining fuel or other operating parameters, or other information such as time of day and outside temperature. For some time now, digital screens, in particular LED or LCD based, have been used to display information. Thus, in particular instrument combinations are known in which a plurality of very different information can be displayed graphically on one or more screens or on a combination of at least one screen with other display elements. Such conventional display devices, particularly instrument combinations, typically occupy a relatively large area on an instrument panel, such as a dashboard of the motor vehicle. In addition, they are usually combined with a shading geometry to ensure that the display is as readable as possible in all lighting conditions. In addition, so-called head-up displays are known in which the information to be displayed to the driver is projected onto a part of a transparent pane, such as the windshield in the motor vehicle, and reflected from there into the eyes of the driver.

In addition, it is generally known to produce stereoscopic two-dimensional images that convey a spatial impression (spatial image). In this case, the different perspective is exploited, under which perceive the two eyes of a human observer when viewing a nearby object this. A stereoscopic image can also be generated artificially by photographing an object from two different viewing angles corresponding to the different viewing angles of an eye pair, and then at the same time recording the two-dimensional images depending on their shooting angle only to the left or only the one right eye of a viewer can be displayed so that the corresponding eye can not perceive the respective image for the other eye. Through the two-eyed viewing from different angles, the viewer can achieve a perception of depth despite the use of only two-dimensional images. Such methods are used today, for example, for "3D" kinofilms or in nuclear magnetic resonance (MR) spectroscopy and structural biology to represent three-dimensional molecular structures.

The present invention has for its object to provide an improved display device for space-saving and variable display of information, in particular for instrument display in vehicles.

A solution to this problem is achieved according to the teaching of the independent claims each by a stereoscopic display device according to claim 1 and a vehicle according to claim 14 with such a display device.

Various embodiments and modifications of the invention are subject of the dependent claims.

A first aspect of the invention relates to a stereoscopic display device, in particular a stereoscopic instrument display unit, for a vehicle. It comprises a display medium having a surface from which a plurality of light channels extend into the display medium, and a set of first light sources and a set of second light sources. In this case, each first light source is arranged to emit light through an associated light channel from a first subset of the light channels along a radiation direction defined by the geometry of this light channel into an outer environment of the display support, which lies beyond its surface. Each second light source is arranged to emit light through an associated light channel from a second subset of the light channels, which is disjoint with respect to the first subset, along an emission direction defined by the geometry of this light channel into the external environment of the display support. The light channels are arranged in pairs of light channels, wherein each pair of light channels has a first light channel from the first subset a second light channel from the second subset, and these two light channels are arranged such that the emission directions of both light channels intersect at a virtual light point outside the light sources. The display medium is formed as a parallax barrier with respect to the light emitted by the light sources, which causes the light emissions from the first and second light channels to be imaged into a particular eye-box located in the external environment Viewer, whose eyes pair is in the usable space area, with one eye the light emissions from the first light channels, but not those from can perceive the second light channels, and can perceive the light emissions from the second light channels, but not those from the first light channels with his other eye, so that there is a stereoscopic image of the virtual light points.

A "stereoscopic display device" in the sense of the invention is to be understood as a display device which is set up to display an object to a human observer by means of two-dimensional images of an object differing with respect to the viewing angle, such that in the binocular viewing of the images a stereoscopic visual impression can arise. In particular, a stereoscopic display device can be set up in such a way that it can display an image of the object taken from a corresponding first viewing angle to the one eye of the observer and to display an image of the object taken from a corresponding slightly different second viewing angle at the same time the eyes can only perceive the picture intended for it.

A "vehicle" in the sense of the invention can be understood as any type of means of transportation by means of which one or more persons can be transported. In particular, a passenger car (PKW), a truck (truck), a motorcycle, a bus is a vehicle according to the invention. This is especially true for the train unit of a train, for a watercraft or an aircraft.

A "display medium" in the sense of the invention is to be understood as meaning a body in or on which a display device is formed or fastened and which carries it. The display carrier is preferably formed from material that is not transparent to the emitted light.

A "light channel" in the sense of the invention means a recess formed in a body, in particular a display carrier, which is designed so that light can pass through it from the inside of the body to the outside. For this purpose, the light channel may be "empty", ie evacuated or filled only with air, or at least partially filled or closed with a material transparent to the light. In particular, a light channel may have an elongate shape such that its extent along a first direction significantly exceeds its extent of any other direction perpendicular thereto, in particular is twice or more thereof. The arrangement of a light channel on the one hand relates to its spatial positioning on the display medium and on the other hand its orientation us thus its resulting emission direction.

A "set of light sources" in the sense of the invention means a set of at least two light sources. The light sources can be in particular bulbs of any kind, preferably light-emitting diodes. The light sources can also each be part of a plurality of lighting or display devices, in particular a plurality of light sources, such as a pixel-based screen. In the latter case, light sources may each be given by a single pixel or by a combination of several neighboring pixels of the screen.

In the sense of the invention, a "radiation direction" of a light channel is to be understood as a straight line which runs through the light channel and along the light channel in the sense of geometric optics emits light emitted by its associated light source into the external environment of the display support Room area directs. The emission direction may in particular be a main emission direction of the light channel along which an intensity maximum of the light conducted to the usable spatial region occurs. Also, the emission direction of a straight line through the light source and the geometric center of gravity of the opening surface of the light channel or, when irradiated in a symmetric solid angle, the direction of a central ray for this solid angle.

A "parallax barrier" in the sense of the invention is to be understood as an apparatus which is arranged in front of an image source so that a viewer who sees the image source through the parallax barrier can only perceive a different partial image of the image source with each eye, whereby a stereoscopic vision without further aids, such as a 3-D glasses, ("autostereoscopic vision") is possible. In order to achieve an optical depth impression, autostereoscopic display devices display two interlaced partial images of an image simultaneously, wherein the light of individual pixels is directed or deflected in different directions by means of one or more parallax barriers so that each eye perceives only one of the partial images assigned to it can.

A virtual point of light is to be understood as meaning a spatially limited area in which the emission directions of both light channels, that is to say the corresponding straight lines, intersect. Due to the finite width of the light channels, a virtual point of light has a limited surface area and, in so doing, a shape which is determined in particular by the geometry of the associated light sources and / or light channels. The virtual spot of light is "outside the light sources" when viewed along the direction of radiation is located in front of or behind the respective light source of the two light channels, so that the same light source with the same eye is not visible simultaneously both through the first light channel and through the second light channel of the virtual light point generating pair of light channels.

As a typical eye distance of an observer, the typical distance between the centers of the pupils of both eyes of a full-grown human can be defined. It is on average 65 mm for men and 62 mm for women. But it can vary depending on the constitution and size in the range between about 55 mm and 75 mm. The usable spatial area in which the stereoscopic image can be perceived by a human observer therefore includes the spatial area in the surroundings of the display device in which the distance of the images of the first light channels from the images of the corresponding second light channels lies in the value range for the typical eye distance.

The stereoscopic display device according to the invention provides an alternative solution to conventional solutions for displaying information, in particular in a vehicle, which also brings a number of improvements. Thus, with the aid of the stereoscopic display device, it is possible to display information, in particular instrument displays, by means of stereoscopic imaging as a virtual image "standing in space" from the viewpoint of the observer and thus to decouple it from the surface of a display device or a projection surface, unlike conventional display devices. This also offers the advantage that a very space-saving implementation of such a display device is possible because the area spanned by the positions of the light channels surface area on the surface of the display support due to the stereoscopic imaging properties can also be dimensioned much smaller than the apparent extent of the viewer perceptible virtual stereoscopic image. In particular, the surface of the display support may also be inclined relative to the emission directions in such a way that the observer only perceives the surface with a grazing look. Then the solid angle at which the viewer perceives the surface, in particular the portion of it spanned by the light channels, is significantly less than the corresponding solid angle when viewed perpendicularly. Thus, compared to conventional display solutions, the flexibility for the arrangement and orientation of the display device relative to the viewer or the spatial area increases.

A possible further advantage may also lie in the fact that, by means of the stereoscopic display device, information can be perceived specifically only within the limited usable spatial area, which in particular can coincide with a spatial area in which a driver of a vehicle equipped with such a display device typically holds his pair of eyes. The information displayed is thus for other people whose eyes are not in the usable space area, not or at least only difficult and not recognizable as a stereoscopic image. For example, the display could be used to indicate to the driver confidential information, such as the identity or telephone number of a caller, so that the driver can decide based on this information whether to accept such an incoming call via a hands-free system of the vehicle, or instead, unnoticed by the passengers - do not respond to the call or send a predetermined answer message.

Hereinafter, preferred embodiments of the stereoscopic display device and variants thereof are described, which, unless expressly excluded, may be combined with each other as well as with the other aspects of the invention described below.

According to a first preferred embodiment, the stereoscopic display device further comprises a control device configured to drive the light sources so that the two light sources of each light source pair either emit light simultaneously or not at the same time. In this way, it can be ensured that the two light sources belonging to a pair of light channels are operated synchronized in order to either switch the virtual light point on or off, without the stereoscopic image causing disturbing perceptions in the observer due to non-synchronized operation of the two light sources. In this case, the control device can in particular be set up such that it always controls light sources which each only jointly to a corresponding light channels (light channel pair), so that they are always in the same lighting state (i.e., on or off or a certain degree of illumination between them).

According to a further preferred embodiment, at least one of the light channels has, at least in sections, a truncated cone shape which opens toward the surface of the display support. The cross section of the truncated cone shape perpendicular to its axis of symmetry may be in particular, at least in sections, circular or elliptical. The associated light source can preferably be below the surface of the Display carrier lying narrow end of the truncated cone shape or even be positioned below it, so that the light channel forms a cone-like opening optical fiber for the emitted light from the associated light source. A truncated cone shape as a determining shape of the light channel can in particular bring the advantage that, on the one hand, a sufficiently large solid angle is given over the opening of the mold to the surface of the display support, in which the radiation of the light source is radiated, so that it does not depend on an exact position of the light source appropriate eye of a viewer arrives in the usable space area to perceive the radiation can. On the other hand, however, a limitation of the geometric beam path can continue to take place such that in the usable spatial area the radiation can not be perceived by the other eye of the observer and thus the formation of a stereoscopic image is not hindered.

According to a further preferred embodiment, a wall surface of at least one of the light channels in a surface section is deformed into the light channel, thereby forming a diaphragm for the beam path in the light channel, which acts at least as part of the parallax barrier. In this way, it is possible to increase the opening angle of the respective light channel for the purpose of forming the largest possible usable space for a first eye of the beholder, and at the same time for securing the stereoscopic imaging by means of acting as a diaphragm deformation of the light channel targeted to the other eye of the Observers directed beam paths to avoid.

Thus, according to a preferred variant of this embodiment, at least one of the light channels, as already described in the preceding embodiment, at least in sections, have a truncated cone shape opening towards the surface of the display support, which is flattened on at least one of its shell sides. This can take place in particular in the form of a conic section with a plane which cuts the lateral surface and preferably runs parallel to the axis of symmetry of the truncated cone.

According to a further preferred embodiment, in at least one of the light channels, its diameter increases towards the surface of the display support with respect to a first cross-sectional direction, while its diameter does not increase with respect to a second, perpendicularly extending cross-sectional direction. In this case, the first and the second cross-sectional direction preferably run parallel to the surface of the display carrier at the exit of the light channel at the surface. In this way, it is possible to choose the opening angle of the light channel in one dimension regardless of the opening angle in its second dimension, especially in a first, preferably with respect to the usual head posture of a viewer vertical direction to choose a wide opening angle, so that the usable area of space along this dimension can take the widest possible extent. In contrast, the opening of the light channel remains in the perpendicular dimension, which is preferably horizontally, so along the connecting line of both eyes, selected in view of the usual head posture of the observer so limited that the light emitted through the light channel at the same time only for one eye Viewer is visible in the usable space area.

According to a further preferred embodiment, the light channels are arranged such that the virtual light points of at least four of the light channel pairs lie in the same virtual image plane and span therein a finite-size virtual surface. In this way, the viewer has the impression of a two-dimensional image lying in one plane. In particular, the virtual points of light can be arranged in a matrix in which each of these points of light represents a cell or position in the matrix. In particular, the matrix can correspond to a 5 × 7 matrix, since in this way a multiplicity of different characters or symbols can be represented with only 12 virtual light points. Depending on the symbols to be displayed, larger or smaller matrix dimensions are also possible.

According to a further preferred embodiment, the number and arrangement of the light channels is selected such that at the same time at least two numbers, letters or other characters can be stereoscopically imaged into the usable spatial area. In particular, a separate matrix of light points can be provided by means of a corresponding arrangement of first and second light channels with associated light sources in the display medium for this simultaneous display of multiple symbols or characters. In this way, it is possible to implement multi-digit displays, such as the display of multi-digit numbers or for the presentation of, at least short, words or phrases. According to a preferred variant of this embodiment, the stereoscopic display device is set up to display the value of a speed, in particular of a motor vehicle. For this purpose, the display can be set up in particular to display at least three digits.

According to a further preferred embodiment, the depth of at least one of the light channels, along the emission direction of the light channel as the shortest distance from the output of the light channel to the surface of the display carrier to is defined to the emitting in the light channel outside of its light source, greater than the largest diameter of this light channel at the surface. In this way, a particularly robust stereoscopic image can be achieved compared to head movements of the observer, since due to the relative depth of the light channel, the risk is reduced that the displacement of the pair of eyes will leave the usable spatial area, at least with respect to this light channel. Thus, the size of the usable space can be positively influenced.

According to a further preferred embodiment, the depth of at least one of the light channels, as previously defined, is between 20 mm and 40 mm, preferably between 25 mm and 35 mm. An advantage in choosing the depth from these areas is that on the one hand a largely robust stereoscopic image is possible against movements of the eye pair of the observer, and on the other hand, the required space for forming the light channels in the display medium space requirement can be kept low. In particular, the space requirement can be kept so low that the light channels can be formed as depressions, in particular holes, in a usual dashboard or instrument panel in typical vehicles.

According to a further preferred embodiment, at least one of the light channels is at least partially filled or sealed with light-transmitting material. This can be advantageously used to counteract contamination or a disturbing penetration of particles or liquids into the light channels and thus to increase the robustness of the display against interference or failure. On the other hand, it can also be achieved that, in any case, such light channels whose light source is currently not activated can not be reflected in an adjacent area, in particular on a transparent pane such as a windshield, thus disturbing the overall stereoscopic impression perceivable by the user. This embodiment can also be used to implement the display device so that the light channels in the idle, i. unlit condition, for the viewer can not be recognized as such.

According to a further preferred embodiment, at least one of the light channels is arranged so that its emission direction relative to the solder is inclined to the surface of the display support at the exit of the light channel. Thus, the radiation direction of the light channel can be decoupled from the inclination of the surface of the display support at the output of the light channel, which in particular increases the flexibility in the arrangement and shaping of the stereoscopic display device.

According to a further preferred embodiment, at least a subset of the light channel pairs along two or more non-parallel straight lines are predisposed so that in the stereoscopic image in the usable space region, the virtual light points come to rest on parallel straight lines to these light channel pairs. In this way, it is possible to display rectangular matrices from virtual points of light, in particular even when the display carrier inclines relative to the viewer. Depending on the perspective distortion inherent in stereoscopic imaging, inverse predistortion is thus implemented by means of a corresponding arrangement of the light channels.

A second aspect of the invention relates to a vehicle having a stereoscopic display device according to the first aspect of the invention, in particular according to one or more of its above-described embodiments and variants. The above, in each case for the stereoscopic display device said, in particular with respect to advantages, thus applies equally to the equipped with such a vehicle.

Furthermore, it is advantageous that the stereoscopic display device can be used in addition to conventional display devices, in particular in a functional combination thereof. This can be used, for example, to display particularly important displays in addition to a classic display directly in the field of vision of the driver, to display certain information only to himself, but not to other passengers, or to introduce a further category of displays, exclusively by means of the stereoscopic display device be represented, so that a further "display level" for the presentation of information, in particular to the driver, can be realized, which differs in their perception significantly from additional existing conventional displays.

According to a preferred embodiment, the display carrier is part of a steering column or instrument panel of the vehicle, and the light channels are arranged such that the usable stereoscopic image space is positioned at a driver's seat of the vehicle to allow viewing of that image by a driver occupant to enable human driver. In this way, an implementation of the stereoscopic display device is made possible, which is not at the expense of a remaining area supply for other, conventional Display devices, such as classic instrument displays in a dashboard, go.

Further advantages, features and possible applications of the present invention will become apparent from the following detailed description taken in conjunction with the figures.

It shows

1 schematically a side view of a stereoscopic display device in a vehicle, according to a preferred embodiment of the invention;

2 schematically a plan view of the stereoscopic display device 1 ;

3 schematically detailed views of various preferred embodiments of a light channel pair, in particular for the stereoscopic display device 1 ;

4 schematically cross-sections of a light channel, according to preferred embodiments of the invention, in particular for the stereoscopic display device 1 ; and

5 a projection image of a light channel pair, the two light channels in each case cross sections according to 4 on the face of a viewer in the usable space area.

In the following figures, the same reference numerals are used for the same or corresponding elements of the invention throughout.

First, it will open 1 Referenced. There is a stereoscopic display device 1 illustrated in accordance with a preferred embodiment of the invention, a display carrier 2 and a plurality of light channels 3 which extends from the upper surface of the display carrier 2 at an angle to the surface in the display medium 2 extend into it. In the lower part of the 1 is a detail view of one of the light channels 3 shown. In each of the light channels 3 there is one light source each 4 , which may be formed in particular as a light emitting diode. The respective light source 4 emits visible light through the respective light channel 3 through along a direction of emission 5 in the outer environment of the display support, in particular in a usable space area 7 , within which the stereoscopic image with a virtual image plane 8th can be perceived when both eyes 6 of a viewer are located in this room area and on the outputs of the light channels 3 on the surface of the display carrier 2 look. The display carrier 2 In particular, a dashboard and / or as shown a steering column of a vehicle 11 with a steering wheel 13 represent. The display device 1 is preferred relative to a driver's seat 12 so in the vehicle 11 arranged that the pair of eyes of an observer, who is the driver's seat 12 usually occupies the usable space area 7 located.

In 2 For example, the same stereoscopic display device is shown again in a plan view from above. The light channels 3 are each to light channel pairs 9 summarized as below in connection with 3a to 3c will be explained in detail. The display device has two matrices 9a . 9b of each 35 Light channel pairs, which are arranged in a rectangular 5 × 7 grid. Alternatively, the matrices 9a . 9b also be predistorted in perspective so that they are in stereoscopic imaging in the usable space area 7 each be mapped into a corresponding rectangular matrix. Each light channel pair 9 , whose luminous source 4 is activated, emits light in two different directions of radiation 5 each indicated by dashed lines, so that the right eye along one of the two emission directions 6R the viewer and along the other direction of radiation, the left eye 6L the observer can receive the light emitted by the light channel pair. By way of example, this is explicitly shown here for the sake of clarity only for a number of light channel pairs. The light channel pairs are respectively arranged, in particular oriented, that the two emission directions 5 on the virtual picture plane 8th cross. Since this applies to all pairs of light channels, the image resulting from the stereoscopic image appears to lie in the same plane, namely the virtual image plane 8th , The radiation direction 5 a light channel 3 can, if it has a symmetrical shape, in particular be defined as its axis of symmetry. Alternatively, the emission direction 5 also by the direction within a solid angle into which the light channel 3 radiated, defined, at which an intensity maximum of the radiation occurs. Other definitions are conceivable. Each of the two matrices can be activated by selective activation of the light sources 4 their light channel pairs 9 Any symbol represented by means of a 5 × 7 matrix, in particular a number or a letter represent. By means of the two matrices 9a . 9b In particular, two such symbols can be displayed side by side, for example to indicate a temperature or a speed. Of course, it is also possible to add more matrices to bring more points or symbols simultaneously to the display.

In the 3a -C are schematic detail views of three different preferred Embodiments of a light channel pair 9 illustrated in particular in the stereoscopic display device 1 can be used.

In a first embodiment according to 3a are the two light channels 3L and 3R a light channel pair 9 immediately adjacent to each other but without overlapping. They are oriented so that their radiation directions 5L respectively. 5R for the left eye 6L or the right eye 6R the viewer in the virtual image plane 8th cross in this case from the surface of the display medium 2 seen from behind the light channels 3L respectively. 3R lies. The light sources not shown here 4 can be within the respective light channel 3L respectively. 3R or along the radiation directions 5L respectively. 5R moved and even like the virtual image plane 8th are behind it.

In the second embodiment according to 3b the two light channels overlap 3L and 3R a light channel pair 9 so that their radiation directions 5L . 5R intersect within the overlap area of the two light channels. Accordingly, the image plane is located 8th in this overlap area. In this way it is possible that for a light channel pair 9 need to minimize space requirements.

In a third embodiment according to 3c are the two light channels 3L and 3R a light channel pair 9 again immediately adjacent to each other, but without overlapping. They are oriented so that their radiation directions 5L respectively. 5R in the virtual image plane 8th cross in this case from the surface of the display medium 2 seen before the light channels 3L respectively. 3R lies. Thus, a virtual image can be generated in this way, apparently still spatially in front of the light channels in the virtual image plane 8th "stands".

The 4a and 4b each show schematically cross sections of a light channel according to preferred embodiments of the invention. At the in 4a illustrated embodiment of a light channel 3 this has perpendicular to its emission a rectangular cross-section, extending from the surface of the display support 2 along the extension direction of the light channel 3 tapered in the direction shown here vertically, while having a constant width in the direction perpendicular thereto. Accordingly, the cross sections 3a and 3b the outer and the inner cross section of the light channel 3 when looking from the outside into the light channel 3 into it. The cross sections 10c and 10e each represent the cross section of the light channel 3 seen from the right or the left side. It can be seen that the light channel 3 up and down funnel-shaped opens, which has the advantage that the vertical eye position in a larger usable space area 7 can lie. Finally, the cross section represents 10d the cross section of the light channel 3 Seen from below or above, having the said constant width, in the horizontal direction, the effect of the display medium 2 as a parallax barrier.

At the in 4b alternative embodiment of a light channel 3 this has the basic shape of an elliptical truncated cone, ie a truncated cone with an elliptical cross-section transverse to its axis of symmetry. The representation of the cross sections corresponds again to those already in 4a selected. However, the basic form is modified by adding to one side, in the illustrated example, a light channel for a right eye 6R a viewer on the left side, a flattening 10f is provided, as it can be defined using a conic section between the basic shape and a plane extending parallel to the axis of symmetry plane. The flattening 10f acts as a diaphragm, which is the lateral emission of the light channel 3 more limited on this side than the opposite side wall of the light channel 3 , Accordingly, the cross sections differ 10c and 10e In this regard. While in this embodiment, the light channel basically in both the vertical and in the horizontal direction to the surface of the display support 2 standing funnel-shaped opening to the largest possible usable space area 7 enabling flattening intensifies 10f the effect of the non-transparent display medium 2 as a parallax barrier, so that of the light channel 3 radiated light despite the funnel-shaped opening of the light channel 3 not in the left eye 6L the viewer can get when the pair of eyes 6L . 6R in the usable space area 7 located. In a - not shown here - special case of this embodiment, the elliptical cross section may have the shape of a circle.

5 shows a projection image of a light channel pair 9 whose two light channels respectively cross sections according to 4b on the face of a viewer in the usable space area 7 , By the flattening 10f conditionally, the projection surface of the two light channels deviates 3 of the light channel pair 9 into the face from a symmetrical ellipse, allowing for greater flexibility over horizontal head movement of the viewer while maintaining separation of the two images.

While at least one exemplary embodiment has been described above, it should be understood that a large number of variations exist. It should also be understood that the described exemplary embodiments are nonlimiting examples only and are not intended to thereby limit the scope, applicability, or configuration of the devices and methods described herein. Rather, the foregoing description will provide those skilled in the art with guidance for implementing at least one example embodiment, it being understood that various changes in the operation and arrangement of the elements described in an exemplary embodiment may be made without departing from the scope of the appended claims deviated from, and its legal equivalents.

LIST OF REFERENCE NUMBERS

1

Stereoscopic display device

2

display support

3

Lichtkanal

3R

Light channel for the right eye

3L

Light channel for the left eye

4

light source

5

radiation direction

5R

Radiation direction to the left eye of the viewer

5L

Radiation direction to the right eye of the beholder

6

Eye of the beholder

6R

right eye of the beholder

6L

left eye of the beholder

7

usable room area

8th

virtual picture plane

9

Light channel pair

9a, b

Matrices of light channel pairs

10a

Cross section of the opening of the light channel

10b

Cross section of the lying in the display carrier end of the light channel

10c

Cross section of the light channel seen from the right side

10d

Cross section of the light channel seen from below or above

10e

Cross section of the light channel seen from the left side

10f

flattened area, aperture

11

 vehicle

12

driver's seat

13

steering wheel

Claims (15)

Stereoscopic display device ( 1 ), in particular a stereoscopic instrument display unit, for a vehicle, comprising: a display medium ( 2 ) having a surface from which a plurality of light channels ( 3 . 3R . 3L ) in the display medium ( 2 extends into it; and a set of first light sources ( 4 ) and a set of second light sources ( 4 ); where: each first light source ( 4 ) is arranged, light through an associated light channel ( 3R ) from a first subset of the light channels ( 3 ) along one through the geometry of this light channel ( 3 ) defined emission direction ( 5 ) in an external environment of the display medium ( 2 ) which lies beyond its surface; every second light source ( 4 ) is arranged, light through an associated light channel ( 3L ) from a second subset of the light channels that is disjoint to the first subset ( 3 ) along one through the geometry of this light channel ( 3 ) defined emission direction ( 5 ) into the external environment of the display medium ( 2 ) to emit; the light channels ( 3 ) in light channel pairs ( 9 ), each pair of light channels ( 9 ) a first light channel ( 3R ) from the first subset a second light channel ( 3L ) from the second subset, and these two light channels ( 3R . 3L ) are arranged so that the radiation directions ( 5 ) of both light channels ( 3R . 3L ) in a virtual spot of light outside the light sources ( 4 ) intersect; and the display medium ( 2 ) as a parallax barrier with respect to that of the light sources ( 4 ) emitted light which causes the light emissions from the first and second light channels ( 3 . 3R . 3L ) so in a particular lying in the external environment usable space area ( 7 ) that a human observer, whose eyes pair ( 6R . 6L ) in the usable space area ( 7 ), with one eye ( 6R ) the light emissions from the first light channels ( 3 ), but not those from the second light channels ( 3L ) and with his other eye ( 6L ) the light emissions from the second light channels ( 3 ), but not those from the first light channels ( 3R ), so that a stereoscopic image of the virtual points of light results. Stereoscopic display device ( 1 ) according to claim 1, further comprising a control device, which is arranged, the light sources ( 4 ) so that the two light sources ( 4 ) of each pair of light sources either emit light at the same time or not. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein at least one of the light channels ( 3 ) has, at least in sections, a truncated cone shape opening toward the surface of the display support. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein a wall surface of at least one of the light channels ( 3 ) is deformed in a surface portion in the light channel, thereby forming a diaphragm ( 10f ) for the beam path in the light channel ( 3 ) is formed, which acts at least as part of the parallax barrier. Stereoscopic display device ( 1 ) according to claim 3 and 4, wherein at least one of the light channels ( 3 ) at least in sections one to the surface of the display medium ( 2 ) has an opening truncated cone shape which is flattened on at least one of its shell sides. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein at least one of the light channels ( 3 ) its diameter to the surface of the display medium ( 2 ) increases with respect to a first cross-sectional direction, while its diameter does not increase with respect to a second, perpendicular thereto extending cross-sectional direction. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein the light channels ( 3 ) are arranged such that the virtual points of light of at least four of the light channel pairs ( 9 ) in the same virtual image plane ( 8th ) and span a finite large virtual area. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein the number and arrangement of the light channels ( 3 ) is selected so that at the same time at least two digits, letters or other characters stereoscopically into the usable space area ( 7 ). Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein the depth of at least one of the light channels ( 3 ), along the radiation direction ( 5 ) of the light channel ( 3 ) as the shortest distance from the exit of the light channel ( 3 ) on the surface of the display carrier ( 2 ) up to the in the light channel ( 3 ) emitting the outside of its light source ( 4 ) is greater than the largest diameter of this light channel ( 3 ) on the surface. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein the depth of at least one of the light channels ( 3 ), along the radiation direction ( 5 ) of the light channel ( 3 ) as the shortest distance from the exit of the light channel ( 3 ) on the surface of the display carrier ( 2 ) up to the in the light channel ( 3 ) emitting the outside of its light source ( 4 ) is between 20 mm and 40 mm, preferably between 25 mm and 35 mm. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein at least one of the light channels ( 3 ) is at least partially filled or sealed with translucent material. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein at least one of the light channels ( 3 ) is arranged so that its radiation direction ( 5 ) against the solder on the surface of the display medium ( 2 ) at the exit of the light channel ( 3 ) is inclined. Stereoscopic display device ( 1 ) according to one of the preceding claims, wherein at least a subset of the light channel pairs ( 9 ) along two or more non-parallel straight lines is predisposed in perspective predisposed so that in the stereoscopic image in the usable space area ( 7 ) the virtual points of light to these light channel pairs ( 9 ) come to lie on parallel lines. Vehicle with a stereoscopic display device ( 1 ) according to any one of the preceding claims. A vehicle according to claim 14, wherein the display medium ( 2 ) Is part of a steering column or an instrument carrier of the vehicle, and the light channels are arranged so that the usable space area ( 7 ) is positioned at a driver's seat of the vehicle for stereoscopic imaging to allow viewing of this image by a human driver engaging the driver's seat.

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