• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A cover member (506) for covering a projection port (508) of a head-up display device (500) of a vehicle (502) between the image generator unit (504) and an element (510) and having an element (516) for modifying the polarization of the light beam (512), and a polarizing light-transmissive polarizer (514) (512) polarized in the second polarization type, in a polarization direction determined.
    公开号:FR3044113A1
    申请号:FR1661125
    申请日:2016-11-17
    公开日:2017-05-26
    发明作者:Reinhold Fiess；Tobias Werner
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    Field of the Invention The invention relates to a cover element for covering the projection aperture of a head-up display device. The invention also relates to a head-up display device provided with such a cover element and to a method for directing light through a cover element.
    State of the art
    Current vehicles can display with head-up display devices, some information projecting them into the driver's field of vision.
    Description and advantages of the invention
    The present invention relates to a cover member for covering the projection orifice of a head-up display device of a vehicle in the path of the beam between the image generator unit of the head display device. high and a return element, in the installed state of the head-up display device, the cover element having an element for modifying the polarization of the light beam in the path of the beam between a first type of polarization and a second type polarization light and a polarization-transparent polarizing filter polarized with the second polarization type, in a determined polarization direction, the polarization filter being in the mounted state of the cover element on the side of the element polarization modification opposite to that of the image generator unit. The covering element is for example a cover plate or other at least partially transparent element. The cover element delimits the interior volume of the head-up display device with respect to its external volume. For example, the cover element is integrated in the dashboard of the vehicle; according to one embodiment it is connected in a mobile or rigid manner to it. The cover element may have a flat or curved surface. The projection aperture is correspondingly made in the dashboard to completely receive the cover element. A head-up display device is a display device providing information in the form of virtual images in the driver's field of view. The image generator unit projects, for example, a light beam through the projection opening on the deflection element, for example, the vehicle windshield or a combination window. A polarization modification element according to the invention is an optical component modifying the polarization or the phase of the light beam. The polarization modifying element is, for example, a delay range or delay film. By way of example, the polarization modifying element transforms a linear polarization into a circular polarization or a linear polarization into an elliptical polarization. A polarizing filter is an optical component that filters a light beam of a certain polarization, partially or with a different polarization. For example, the polarizing filter filters a light beam by selective absorption. The polarizing filter may in particular be designed as a linear polarizing filter. According to the embodiment, the polarization modifying element and the polarizing filter are combined in the form of layers, for example a combination of films. The retarding principle is thus applied according to which a polarizing filter and a retarder are integrated in the window covering the head-up display device. According to one embodiment, the second polarization direction is that which is traversed in the polarization filter so that the display beam first has its polarization turned and then it passes through the filter with the second polarization.
    The solution proposed here is based on the consideration that the combination of the polarization modifying elements and a polarizing filter in the cover element of a head-up display device, in particular a reflected head-up display device. directly through the windshield avoids reflections of sunlight in the head-up display device in the case of directly incident solar radiation. This avoids dazzling the observer looking at the head-up display device.
    Such a covering element for suppressing solar light reflections in a head-up display device has the advantage that, depending on the embodiment of the components such as, for example, microlens arrays, which have residual reflection. surface, under the effect of the curved surface, they allow to reflect in different directions, sunlight injected to a small extent; they can be applied to the optical system of the head-up display device so that the cover element avoids reflections of the sunlight by the direct-reflection display surface on which solar radiation coming from other angular areas by allowing, for example, to realize the head-up display device as an auto-stereoscopic display device using microlens arrays.
    According to one embodiment, the polarization modifying element modifies the polarization between a circular polarization as a first type of polarization and a linear polarization as a second type of polarization. The polarizing filter may be transparent to linearly polarized light. According to one embodiment, the light rays emitted by the display device are first polarized in circular polarization and then polarized in linear polarization by the retarder and passed through the linear polarizing filter. This embodiment causes only linearly polarized light rays to arrive in the viewer's field of view.
    According to another development, the polarization modifying element and in addition or alternatively the polarizing filter polarizes the light beam of the image generator unit so that the linear polarization, incident on another optical element present at the same time a perpendicular oscillation component and also parallel to the plane passing through the incident light beam arriving on the optical element and the normal to the surface of the optical element at the point of incidence. The optical element is, for example, the windshield of the vehicle or a handset glass. The polarization modifying element and / or the polarizing filter are thus made to polarize the substantially perpendicular light ray, parallel or inclined at an angle defined with respect to the plane of incidence, in the direction of emission of the light beam.
    According to one embodiment, for the same operation of the neutralization of the solar radiation reflection, the system offers a degree of freedom in the orientation of the linear polarization of the image rays on the windshield or the combined device. This linear polarization may be, for example oriented completely perpendicularly to the plane of incidence to allow significant reflection even at angles close to the Brewster angle. Alternatively, an orientation can be made with components perpendicular to and parallel to the plane of incidence, in comparison with a rotated polarization direction. Linear polarized sunglasses often completely filter the completely perpendicular polarized light so that the system is intentionally designed to have a parallel component. This embodiment improves the reflection of the light beam on the windshield. In addition, this allows the use of the head-up display device with special polarized sunglasses.
    According to an advantageous characteristic, the cover element directs in a skylight, the light beam arriving on the surface of the cover element turned towards a deflection element. A skylight is an element that absorbs light rays. The skylight is, for example, a matte black surface. This avoids parasitic light reflections in the observer's field of view.
    According to another feature, the polarization modifying element is a retardation film λ / 4. A λ / 4 retardation film polarises the light rays parallel to a component-specific axis by retarding them by a quarter of a wavelength relative to the perpendicularly polarized light rays. This makes it possible, for example, to convert linearly polarized light rays into circular or elliptically polarized light rays and vice versa.
    According to another development, the polarization modifying element and the polarizing filter are in the form of a combination of layers, which allows a simple and economical manufacture of the cover element. The invention also relates to a head-up display device for a vehicle, characterized in that it comprises an image generator unit, a projection opening in the path of the beam between the generator unit of images and a vehicle return element and, a cover element to cover the projection orifice.
    According to one development, the head-up display device has a skylight. The cover element directs a light beam into a skylight, arriving on the surface of the covering element facing the deflection element, which effectively avoids parasitic light reflections in the field of view of the observer.
    According to another development, the cover element comprises the skylight to have a particularly effective neutralization of the light reflections. The invention also relates to a method for directing light through the cover element according to any one of the above embodiments; the method comprises: changing the polarization of the light beam passing in the path between the image generator unit and the deflection element, to switch from a first type of polarization to a second type of polarization, and pass a light ray polarized in a certain polarization direction according to the second type of polarization through the polarizing filter.
    drawings
    The present invention will be described hereinafter in more detail with the aid of exemplary embodiments of cover elements and head-up display device shown in the accompanying drawings, in which: FIG. 2 is a diagram of an autostereoscopic head-up display device; FIG. 3 is a diagram of an autostereoscopic head-up display device with a parallax barrier; FIG. 4 is a schematic view of a head-up, auto-stereoscopic display device based on a microlens array, FIG. 5 is a schematic view of a head-up display device corresponding to an example embodiment. FIG. 6 is a diagram of the head-up display device of FIG. 5, FIG. 7 is another diagram of the head-up display device of FIG. 5, FIG. Fig. 9 is a schematic diagram of a head-up display device with a slat cover device, Fig. 9 is a schematic diagram of the head-up display device of Fig. 8; head-up display having a slat structure device on the display surface, and Fig. 11 is a very simplified flow chart of a method of guiding light through a cover member according to an exemplary embodiment of the invention.
    Description of embodiments
    In the following description, the exemplary embodiments of the invention will be described and the elements of the same function or of similar function will bear the same references and their description will not be systematically repeated.
    FIG. 1 shows the diagram of a head-up display device 100. The head-up display device 100 is installed in a vehicle 102 and includes an image generator unit 104 and a display optics head-up 106 for projecting the light beam of the image generator unit 104 into the eye 108 of the driver of the vehicle 102.
    The current head-up displays are constructed to form an image plane of the image generator unit 104 (abbreviated as the PGU) using head-up display optics. 106 on a virtual image in front of the vehicle 102. The driver perceives the enlarged image generated by the image generator unit 104. This image can be combined with the traffic scene and be at a defined distance from the windshield. serving as a projection surface on a virtual screen 110. The image generating element of the image generator unit 104 is, for example, an LCD module.
    As already indicated, the virtual image presented is an enlarged image supplied by the image generator unit 104. The head-up display optics 106 must thus have a certain magnification. The necessary magnification increases with the distance of the virtual screen 110, i.e. the image generated by the image generator unit 104 must be enlarged more strongly to account for the greater distance the desired field of vision of the driver. At the distance of the virtual screen 110 in the current head-up display devices is, for example of the order of 15 m.
    The auto-stereoscopic head-up display system generates distinct partial images for the left eye and the right eye creating a 3D relief effect as will be described hereinafter with reference to FIG.
    FIG. 2 is a diagram of an auto-stereoscopic head-up display device 100 showing the principle operation of the auto-stereoscopic head-up display device 100. Unlike the head-up display device described in FIG. With the aid of FIG. 1, the head-up display device 100 according to FIG. 2 generates distinct partial images for the left eye 200 and for the right eye 202. The partial images are, for example, generated by the unit. The optics 106 of the head-up display device then provides the light of the partial images to the respective eye in a small eye box.
    Such an auto-stereoscopic solution requires that the two partial images for the left eye and the right eye be emitted in the display of the image generator unit 104 in different directions to thereby be provided to each respective eye. by the optics 106 of the head-up display device.
    To separate the image information, the display device is, for example divided into different areas for both eyes. Each eye then sees only certain display parts that are, for example, in the form of bands distributed along the axis of display. Such a distribution can be achieved, for example by means of a parallax barrier which will be described hereinafter with reference to FIG.
    Figure 3 schematically shows a self-stereoscopic head-up display device 100 applying the parallax barrier. In this case, the LCD display 300 is provided at a short distance with a layer of band-shaped barriers 302 which cover certain display areas for each eye. Both eyes look through the barriers on different bands of the display 300. These tapes serve to represent different partial images for both eyes. The eyes can thus receive different partial images.
    A similar solution consists in producing a network of cylindrical microlenses on an LCD module. The principle is explained in FIG. 4 and operates analogously to the principle of FIG. 3. Each eye sees through the microlenses only strip-shaped zones determined from the display. This spatial separation makes it possible to present to both eyes, partial images different from the display.
    FIG. 4 is a schematic representation of an auto-stereoscopic head-up display device 100 based on the principle of a microlens array 400. The figure shows the principle of operation of a head-up display device 100 with a network of microlenses 400 installed in front of a flat LCD screen 402. Through the microlenses, each eye only sees a certain area of the display 402 corresponding to the partial images. The microlenses are distributed as cylindrical lenses over the entire display surface, resulting in strip-like areas for each partial image.
    Figure 5 is a diagram of a head-up display device 500 according to an example embodiment. The head-up display device 500 is integrated in a vehicle 502 and includes an image generator unit 504, here a display device and a cover member 506 for covering the projection opening 508 of the display device. Head-up display 500. Projection aperture 508 is in the path of the beam between image generator unit 504 and a deflection element 510 of vehicle 502. The deflection element is, for example, vehicle breeze or handset glass. The projection opening 508 is for example made in the dashboard of the vehicle 502. The image generator unit 504 emits a light beam 512 in the path of the beam. The cover member 506 is composed of a polarizing filter 514 and a polarization modifying element 516 between the polarizing filter 514 and the image generator unit 504. The figure shows an example of a system structure of the a head-up display device 500 with a self-timer integrated in the cover element 506 as a polarization-modifying element 516. The polarization-modifying element 516 makes it possible to modify the polarization of the incident light beam 512 originating from the image generator between a first type of polarization, here a circular polarization and a second type of polarization, here a linear polarization. The polarizing filter 514 passes only the light rays which correspond to the second type of polarization, in a certain polarization direction according to FIG. 5, that is to say a linear polarization having a defined orientation. The polarization types and the polarization directions of the light beam 512 are indicated by arrows.
    The polarizing filter 514 and the modifying element 516 are, for example combined in a vision module.
    According to an exemplary embodiment, the cover element 506 has an enlargement layer as a polarization modifying element 516 in combination with a linear polarizing filter 514. This combination makes it possible, for example, to filter out the incident solar radiation. on the return from the head-up display device 500. This results in particular as follows.
    In the case of a display polarization adapted to the system, the sunlight can be eliminated by filtering without influencing the useful light of the image generator unit 504, that is to say without deteriorating the efficiency of the system.
    An appropriate construction of the cover member 506 advantageously incorporates this principle into existing systems, eliminating the basic adaptation of the process design. By way of example, the direction of linear polarization of the light beam 512 directed towards the observer can be freely chosen in the construction of the system. After the passage of the polarizing filter 514, the light beam 512 may, for example, have a diagonal direction in space and which corresponds substantially to an angle of 45 ° with respect to the plane of the incident light of the light beam 512; this plane is subtended by the incident ray 512 in the direction and the ray reflected by the axis 518 towards the eye 520. This prevents a displayed virtual image 522 being filtered out of the sunglass with a filter horizontal linear polarizer. The orientation of the linear polarization with respect to the plane of incidence is important. The light beam 512 has a parallel portion and a perpendicular portion so that it will be oriented at 45 ° with respect to the plane of incidence. Thus, the double arrow of Figure 5 of the exemplary embodiment means that the linear polarization is rotated in the plane of the drawing. In this case, purely polarization type (s) would be suitable for those who do not wear polarizing sunglasses. Provided that, for reasons of sealing, the head-up display device 500 has a display chamber without a cover, the cover plate does not create additional space to achieve the proposed solution. The cover member 506 is particularly suitable for being integrated in a system having a display injected directly by the confirmation element 510. This allows a construction with a very small footprint.
    According to an exemplary embodiment, the head-up display device 500 applies the delay principle in that the cover element 506 which closes the head-up display device 500 has a linear polarization filter 514 and a delay film λ. / 4 as polarization modifying element 516. These two elements are integrated. Figure 5 shows the operation of such a system. The figure shows a variant with a display combined directly with the windshield 510. The display of the image generator unit 504 thus radiates in circular polarization. The circular polarization is shown schematically in Figure 5 by a circular arrow. After passing the useful light in the form of a light beam 512 through the polarization modifying element 516, the useful light is polarized linearly and can thus pass through the polarizing filter 514 without being modified. The linear polarization of the light beam 512 is characterized by the double inclined arrow.
    The polarizing filter 514 and the polarization modifying element 516, which are made, for example, in the form of layers, are positioned so that the passing useful light has a freely defined linear polarization direction. This allows, for example, a linear polarization perpendicular to the plane of incidence to maximize the reflection on the windshield 510 or a direction of linear polarization on the diagonal in space to prevent the image 522 is eliminated filtering by linear polarized sunglasses.
    FIG. 6 schematically shows a head-up display device 500 according to FIG. 5. The figure shows a function of a special shape, here concave, of the covering element 506 through which the light rays arriving from the zone of the position of the observer's head is deflected by reflection on the surface of the cover member 506, opposite the windshield 510 to arrive in a light well 600. The shape of the cover element 506 is, for example, designed to avoid surface reflections on the cover member 506 itself, by directing the light rays arriving from the observer's area, by reflection towards the cover member 506 in the well of light 600. The observer looks indirectly into the skylight 600 which has, for example, a matte black surface. This avoids a reverse path of dazzling rays of the sun, that is to say that it prevents the sun rays arrive through the cover element 506 in the eye 520 of the observer.
    According to this embodiment, the skylight 600 is at the edge of the cover member 506, opposite the observer.
    FIG. 7 is a schematic representation of a head-up display device 500 according to FIG. 5. FIG. 7 shows the filter function of the sunlight by the cover element 506. The unpolarized light beam 700, incident , is polarized by the polarizing filter 514 which is here a linear filter. After traversing the polarization modifying element 516, the light beam 700 has a circular polarization. Upon reflection on the display surface of the image generator unit 504, the circularly polarized light beam 700 is rotated in its direction of travel so that after the second pass through the polarization 516, it has a linear polarization crossed with respect to its polarization after the first pass. The light beam 700 is thus blocked by the polarizing filter 514.
    For example, the light ray 700 is a solar radiation beam that is firstly unpolarized and incidental and that, at the first pass through the polarization filter 514, is polarized linearly. This linearly polarized sun ray will be polarized in circular polarization at its first pass through the polarization modifying element 516 to then arrive at the display surface of the image generator unit 504.
    The reflection on the display surface changes the direction of the circular polarization by a phase jump. After another pass through the polarization modifying element 516, the sunlight is polarized again in linear mode. This linear polarization is now crossed with respect to the polarization direction of the polarizing filter 514 so that sunlight will finally be removed by filtering. The cover member 506 can be used independently of the design, also in systems having additional imaging mirrors, and is suitable for stereoscopic and non-stereoscopic head-up display devices.
    Figure 8 schematically shows a head-up display device 500 having a slat cover device. The head-up display device 500 is made analogous to the head-up display device described above with reference to FIGS. 5-7 except that the cover member 506 has a slat structure device 800 to the position of the polarizing filter and the polarization modifying element.
    The slats of the slat structure device 800, adapted to transmitted image rays, block the light rays beyond the angular range used by the image generator unit 504, which avoids the dazzling reflections of the solar rays. . The shape of the slat cover 506 may be chosen analogously to a conventional cover, so that the cover member 506 does not itself cause troublesome back reflections. Thus, the image generator unit 504 may have any output bias. The light rays emitted by the image generator unit 504 may, for example, not be polarized, which avoids negative effects such as could be, for example, caused by the observation of the display device head up through polarizing sunglasses.
    FIG. 8 shows a system structure with lamellae integrated in the cover element 506, the lamellae being formed to transmit only a certain angular range in which the useful image passes through the covering element 506. The light rays , beyond this angular range, arrive on the integrated slats which block them.
    According to an exemplary embodiment, the head-up display device 500 is made with a lamella cover whose lamellae are formed to let only light from a certain angular range like a blind. FIG. 8 applies the principle analogous to that of FIG. 6. The lamellae are oriented to allow the passage of the light rays generated in the angular range of the head-up display device 500 through the covering element 506. The shape of the covering element 506 is chosen so that the reflections on the surface do not dazzle the observer.
    FIG. 9 schematically shows a display device 500 according to FIG. 8. The figure shows the principle of the neutralization function of an incident light beam 900, passing through the windshield 510, using an element of FIG. cover 506 with an integrated slat structure device 800. The light rays beyond the angular range of lamella transmission are directly blocked. The light rays in the angular range are reflected by the display surface of the image generator unit 504 and arrive outside the acceptance angle on the cover member 506 so that are thus also blocked.
    Fig. 9 shows, by way of example, the behavior of the system in response to incident solar light. The solar rays outside the acceptance angle that arrive on the lamellae are blocked. The solar rays within the acceptance angle are reflected on the surface of the display and then arrive beyond the acceptance angle back onto the slat structure 800 so that they are also blocked.
    Figure 10 schematically shows a head-up display device 500 having a slat structure device on the display surface. Unlike the head-up display device described above with reference to FIGS. 5 to 9, here the display device 500 according to FIG. 10 does not comprise a cover element. Instead, the surface of the display device of the image generator unit 504 has a lamellar film 1000 with a slat structure device.
    The figure shows the system structure of the head-up display device 500 with a slat structure device directly on the reflective display surface. The principle of the neutralization of sunlight resembles the operating principle shown in FIG. 9. To avoid reflections on the surface of the lamella film 1000, this lamella film 1000 is optionally provided with a comb structure 1002 which has structures, for example blackened on one side.
    The display slats are, for example, made in the form of a free grid with narrow spacers or integrated in a film or in a layer of glass. The direct application of such a lamellar structure on the display surface has the following advantages: On the one hand the display used may have any polarization of radiation and, for example, not be polarized, this which avoids negative effects, for example, for those wearing polarized sunglasses and using the head-up display.
    By using sufficiently stable display structures the cover element is eliminated so that the space required for the head-up display device 500 will be reduced significantly.
    FIG. 10 shows an example of a system in which the display of the image display unit 504 is done directly by projection on the windshield 510. The film of lamellae 1000 is additionally covered by a comb structure 1002 whose segments are inclined. The inclined segments of the display device prevent light from happening by direct reflection on the upper surface towards the eye 520 of the conductor. The segments of the comb structure 1002 are, for example, blackened on one side.
    The comb structure 1002 may have the same periodicity as that of the slats applied to the display device. Alternatively the segments may have a smaller or larger gap than the slats. The different slats can be integrated into the film structure or the glass structure.
    As a variant of the lamellae integrated into the substrate, the display may also comprise a structure of free lamellae. In this case, it is not necessary to have a comb structure to receive the lamella structure. The comb structure can be combined with, for example, the cover element described above with the aid of FIGS. 5 to 7, to protect the lamella structure against dust and direct mechanical influences.
    The structure of free lamellae can be realized, for example, in the form of thin metal spacers, for example, in combination with stabilizing spacers in the transverse direction.
    Fig. 11 shows a flowchart of a method 1100 for driving light through the cover element according to an exemplary embodiment. The method 1100 is, for example, applied using the cover element described above, with the aid of FIGS. 5 to 7. In step 1110, the polarization modification element modifies the polarization of the led light beam. in the path of the beam between the image generator unit and the windshield, to switch from the first type of polarization to the second type of polarization. In a next step 1120, the light beam is passed through the polarizing filter, this ray having been polarized in a predefined polarization direction and corresponding to the second polarization type.
    NOMENCLATURE DBS MAIN ELEMENTS 100 Head-up display device 102 Vehicle 104 Image generator unit 106 Head-up display 108 Driver's eye 110 Virtual display 200 Left eye 202 Right eye 300 Display device 400 Microlens network
    402 LCD display 500 Head-up display 502 Vehicle 504 Image generator unit 506 Cover element 508 Projection port / cover element 510 Deflector / windshield / windshield-protecting element 512 Light beam / shape luminous radius 514 Low-pass filter / linear polarization filter 516 Polarization modification element 520 Eye 522 Virtual image 600 Lightwell 700 Luminous ray blocked by the polarizing filter 800 Lamella structure 1000 Lamella-film 1002 Comb structure
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1) Covering element (506) for covering the projection orifice (508) of a head-up display device (500) of a vehicle (502), the projection opening (508) being located in the beam path between the image generator unit (504) of the head-up display device (500) and a deflection element (510), in the installed state of the head-up display device (500). ), a covering element (506) characterized by: a polarization modifying element (516) for modifying the polarization of the light beam (512) in the optical path, for modifying it between a first polarization type and a second polarization type , and a polarizing filter (514) transparent to the light beam (512) polarized with the second type of polarization, in a determined polarization direction, the polarization filter (514) being, in the mounted state of the cover (506), on the side of the polarization modifying element (516) opposite to that of the unit image generator (504).
    [0002]
    2) Cover element (506) according to claim 1, characterized in that the polarization modifying element (516) modifies the polarization between a circular polarization as a first type of polarization and a linear polarization as a second type of polarization, the polarizing filter (514) being transparent to a linearly polarized light beam (512).
    [0003]
    3) Cover element (506) according to one of claims 1 and 2, characterized in that the polarization modifying element (516) and / or the polarizing filter (514) polarize the light beam (512) essentially perpendicularly or at an angle defined with respect to the plane of incidence of the light beam (512).
    [0004]
    4) Cover element (506) according to one of claims 1 to 3, characterized in that it directs the light beam arriving on the surface of the opening element (506) facing the deflection element (510) in a skylight (600).
    [0005]
    5 °) covering element (506) according to one of claims 1 to 4, characterized in that the polarization modifying element (516) is a polarizing film λ / 4.
    [0006]
    6 °) Cover element (506) according to one of claims 1 to 5, characterized in that the polarization modifying element (516) and the polarizing filter (514) are made as a combination of layers.
    [0007]
    7 °) head-up display device (500) for a vehicle (502), characterized in that it comprises an image generator unit (504), a projection aperture (508) in the optical path between l image generator unit (504) and a deflection element (510) of the vehicle (502), and a cover member (506) according to one of claims 1 to 7 for covering the projection orifice (508). ).
    [0008]
    8) Head-up display device (500) according to claim 7, comprising a skylight (600), the covering element (506) being formed to direct the light beam arriving on the surface of the light element. cover (506) facing the deflection element (510) in the skylight (600).
    [0009]
    9 °) head-up display device (500) according to claim 8, characterized in that the skylight (600) is part of the cover element (506).
    [0010]
    Method (1100) for guiding light through a cover element (506) according to one of Claims 1 to 6, characterized by the following steps: modifying (1110) the polarization of a light beam ( 512) in the optical path between the image generator unit (504) and the deflection element (510), between the first type of polarization and the second type of polarization, and passing (1120) the beam light (512) polarized in a direction of polarization predefined by the polarizing filter (514) according to the second type of polarization.
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    同族专利:
    公开号 | 公开日
    EP3377933A1|2018-09-26|
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    法律状态:
    2017-11-24| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-21| PLSC| Search report ready|Effective date: 20180921 |
    2019-11-21| PLFP| Fee payment|Year of fee payment: 4 |
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    优先权:
    申请号 | 申请日 | 专利标题
    DE102015222842.8A|DE102015222842A1|2015-11-19|2015-11-19|Cover element for covering a projection opening of a head-up display, head-up display and method for passing light through a cover|
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