EP3417334A1 - Projektionsvorrichtung für ein head-up-display, head-up-display sowie fahrzeug - Google Patents
Projektionsvorrichtung für ein head-up-display, head-up-display sowie fahrzeugInfo
- Publication number
- EP3417334A1 EP3417334A1 EP17705385.7A EP17705385A EP3417334A1 EP 3417334 A1 EP3417334 A1 EP 3417334A1 EP 17705385 A EP17705385 A EP 17705385A EP 3417334 A1 EP3417334 A1 EP 3417334A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- projection
- optical element
- projection device
- circular polarizer
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 110
- 238000003384 imaging method Methods 0.000 claims abstract description 33
- 239000011521 glass Substances 0.000 claims description 5
- 230000010287 polarization Effects 0.000 description 12
- 230000011514 reflex Effects 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000167880 Hirundinidae Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/65—Instruments specially adapted for specific vehicle types or users, e.g. for left- or right-hand drive
- B60K35/654—Instruments specially adapted for specific vehicle types or users, e.g. for left- or right-hand drive the user being the driver
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/20—Optical features of instruments
- B60K2360/33—Illumination features
- B60K2360/334—Projection means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
- G02B2027/012—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility comprising devices for attenuating parasitic image effects
Definitions
- the present invention relates to a projection device for a head-up display, a head-up display with such a projection device and a vehicle with such a head-up display.
- a head-up display in a vehicle has the task visually represent information in the natural visual field of the driver.
- the natural visual field corresponds to the vehicle environment, which the driver must primarily observe during operation of the vehicle, e.g. the road section in front of a car.
- the information in question is transmitted by a projection device to a suitable projection surface, e.g. a windscreen, projected and reflected there so that the driver can perceive the information visually, without having to take the view of the primary to be observed for the operation of the vehicle environment, which the reliability of equipped with such a head-up display Vehicle significantly increased.
- a head-up display In order to ensure reliable operation in different situations, in particular under varying lighting conditions, provision must be made in a head-up display to keep outside of the vehicle incident light, in particular sunlight, out of the beam path of the projection device or intrusion of light at least reduce. Otherwise reflected light on the surfaces of optical elements of the projection device leads to reflections that can be felt in the field of vision of the driver and in extreme cases dazzle, or at least irritate and / or interfere with the information to be visualized and possibly make them unreadable.
- the projection device has an imaging unit, which is designed to generate an image, and a projection unit, which is designed to project the image generated by the imaging unit onto a projection surface via a projection path, and is characterized by a projection path arranged in the projection path curved optical element, which is provided with a circular polarizer or designed as a circular polarizer.
- the head-up display according to the invention has a projection surface, in particular a windshield of a vehicle, and a projection device according to the invention.
- the vehicle according to the invention in particular motor vehicle, has a projection surface, in particular in the form of a front-end writing, and a projection device according to the invention.
- the invention is based on the approach of providing a domed circular polarizer or a domed optical element provided with a circular polarizer in the projection path.
- the curved circular polarizer or the curved optical element provided with the circular polarizer is located between the projection surface, in particular a windshield, and the imaging unit, for example a display.
- the curvature of the surface of the circular polarizer or of the optical element provided with the circular polarizer is concave on the side facing the projection surface.
- the domed circular polarizer or the circular polarizer-shaped domed optical element is shaped and / or arranged in the projection path so that a part of unpolarized light incident from the projection surface, such as sunlight, is reflected on the concave side not to be thrown back onto the projection screen. This prevents that this part of the light reflected at the circular polarizer or at the optical element provided with the circular polarizer appears as a disturbing reflection in the field of vision of the vehicle driver.
- the curved circular polarizer or the circular polarizer For the image produced by the image generating device and projected on the projection surface by the projection device, at least in a certain wavelength range, it must not be possible to prevent a portion of the unpolarized light incident from the projection surface from being transmitted through the circular polarizer or optical waveguide the optical element provided with the circular polarizer passes. This portion of the unpolarized light incident from the projection surface is impressed as it passes through the circular polarizer a first direction of polarization, wherein its mutually perpendicular portions are delayed by a phase of ⁇ / 2, so that it is circularly polarized in the interior of the projection device.
- the circular polarizer or the optical element provided with the circular polarizer After reflection on a surface of an optical element in the projection device, e.g. a mirror or a lens, the circular polarizer or the optical element provided with the circular polarizer now acts as absorber in the reverse direction of propagation of the circularly polarized light, since the phase delay of the two mutually perpendicular portions now produces a second polarization direction which is perpendicular to the first polarization direction stands.
- the circular polarizer or the optical element provided with the circular polarizer prevents the light reflected from the surface of optical elements of the projection device from exiting in the direction of the projection surface, so that reflections occur in the field of vision of the vehicle driver due to surfaces on the projection device optical elements of reflected light is prevented or at least greatly reduced.
- both the curved circular polarizer or the arched optical element and the other optical elements in the interior of the projection device reflected components of the incident on the projection device from the outside light, in particular sunlight, as disturbing reflections in the field of view the driver appear.
- the emergence of unwanted reflections in the natural field of vision of the driver is thereby prevented or at least significantly reduced.
- the surfaces of the optical elements located in the projection device are provided with antireflection coatings or antireflection surface structures are.
- the curved circular polarizer or the curved optical element provided with the circular polarizer is arranged such that light incident from the projection surface is reflected by a reflection on the concave side of the circular polarizer or of the optical element provided with the circular polarizer , eg an absorbing optical element is steered. In this way, it is reliably prevented that light incident from the projection surface and reflected by the concave surface of the circular polarizer or of the optical element strikes the projection surface and is perceived there by the driver as a disturbing reflex.
- the curved circular polarizer or the curved optical element provided with the circular polarizer is designed and / or arranged in such a way that light reflected from the area of the driver's eyes and mirrored on the projection surface and incident on the curved element is reflected by reflection concave side of the circular polarizer or provided with a circular polarizer optical element on a radiation trap, eg an absorbing optical element is steered.
- a radiation trap eg an absorbing optical element is steered.
- the circular polarizer has a linearly polarizing element and a ⁇ / 4 layer.
- Unpolarized light which falls in particular from outside the vehicle to the linearly polarizing element, after passing through the linearly polarizing element only a single direction of vibration, ie a fixed polarization, on.
- the ⁇ / 4 layer is oriented so that two mutually perpendicular components of the light polarized in this oscillation direction light when passing through the ⁇ / 4 layer are delayed so that their phase difference is exactly ⁇ / 2, whereby the direction of vibration of the now circularly polarized light seen from a fixed point of the form of a Helix has. This ensures in a simple manner and with high reliability that incident unpolarized light is circularly polarized as it enters the projection device.
- the ⁇ / 4-layer viewed in the direction of the projection path in the projection of the image onto the projection surface, is arranged in front of the linearly polarizing element.
- Light incident from the outside into the projection device thus first passes through the linearly polarizing element and then the ⁇ / 4 layer and is thereby circularly polarized in a simple and reliable manner.
- the light subsequently reflected on surfaces of optical elements in the interior of the projection device first passes through the ⁇ / 4 layer before exiting the projection device and then only the linearly polarizing element.
- the circular polarizer or the optical element provided with the circular polarizer acts as an absorber because of the now reversed propagation direction of the circularly polarized light, since the phase delay of the two mutually perpendicular components of the light through the ⁇ / 4 layer now produces a second polarization direction, which is perpendicular is in the first direction of polarization, so that the linearly polarized light in this way is absorbed by the linearly polarizing optical element located behind it.
- leakage of the light reflected on surfaces of optical elements in the projection device in the direction of the projection surface is prevented or at least greatly reduced.
- the optical element is formed as a curved, transparent plate, in particular as a glass or plastic plate.
- the circular polarizer is attached to this curved, transparent plate, in particular laminated.
- a reliable circular polarization of the incident unpolarized light is ensured with simultaneous simple production.
- a trained in this way optical element can be installed very compact, ie it requires only little space.
- a first side of the optical element is curved concavely and a second side of the optical element is convexly curved.
- the shape of the curvature on the first and second sides of the optical element is the same.
- the optical element is thin, lightweight and space-saving and can be easily installed in the projection device.
- the circular polariser is on the second side, i. the convex curved side, the optical element attached, in particular laminated.
- the reflection properties of the first side, i. concave side of the optical element with respect to the externally incident light can be optimized independently of the configuration of the circular polarizer, which in turn can be optimized regardless of the design of the reflective first side of the optical element in particular with respect to the polarizing or polarization-rotating properties.
- Undesirable reflexes in the field of vision of the driver are thereby particularly reliably prevented or at least reduced.
- the first side, ie the concave side, of the optical element is directed towards the projection surface.
- the second side, ie the convex side, of the optical element is directed toward the projection unit.
- the optical element is thus particularly favorably designed to at least partially reflect light that is incident from the outside and / or emanating from the area of the driver's eyes, reflected on the projection surface and striking the first side of the optical element so that it does not can get more on the projection surface and cause disturbing reflections in the field of vision of the driver.
- the concavely curved surface of the optical element acts as a bundle, so that reflected light is controlled in a direction in which the formation of reflections, which are perceived as dazzling or at least disturbing by the driver, is particularly reliably avoided.
- a part of the light incident on the projection device from the outside, such as sunlight, is efficiently reflected on the first side of the optical element even before the remaining part of the light passes through the circular polarizer. This will increase the intensity of the light entering the projection device is reduced so that undesired reflections in the field of vision of the vehicle driver are particularly reliably prevented or further reduced.
- the projection device has a beam catcher, which is arranged in such a way and / or designed to swallow, in particular to absorb, light beams incident and reflected on the first side of the optical element.
- a beam catcher is arranged in the immediate vicinity of the curved optical element, in particular next to the curved optical element. In this way, beam catcher and curved optical element can be installed to save space.
- the projection unit has at least one further optical element, in particular a mirror, a mirror system, a lens, a lens system or a light guide, wherein at least one surface of the at least one further optical element has an antireflection layer.
- the proportion of the circularly polarized light reflected at the at least one surface of the at least one further optical element is reduced, typically by a factor of 4 to 5.
- Undesired reflections in the field of vision of the vehicle driver due to reflections from the exterior of the projection device There reflected light on surfaces of optical elements are particularly reliably prevented or further reduced in this way.
- the projection device has a housing, which surrounds the projection device and has an exit window, through which the image generated by the imaging unit is projected onto the projection surface.
- the exit window is preferably formed by the optical element.
- the optical element acts as a cover glass of the housing.
- the curved circular polarizer or the optical element provided with a circular polarizer serves not only for the reduction or prevention of disturbing reflections in the field of vision of the Driver, but also provides an effective and easy-to-implement protection of the components of the projection device against ingress of dirt and dust, which could limit the functionality of the projection unit.
- FIG. 1 shows an example of a head-up display in a cross-sectional representation
- Fig. 2 is an example for illustrating the occurrence of disturbing
- FIG. 3 shows a further example of a head-up display in a cross-sectional representation
- Fig. 4 a shows a detail of a further example of a head-up display and b) an enlarged detail of the curved optical element, in each case in a cross-sectional representation;
- Fig. 5 examples of arranged in the projection path optical elements of a projection unit of a head-up display.
- the imaging unit 2 can be, for example, a display, preferably a display with thin-film transistor control (so-called TFT display) and backlighting.
- the imaging unit 2 generates an image which is projected by means of a projection unit into the field of vision of a vehicle driver 4 and can be visually perceived by the latter.
- the projection unit has optical elements 12 and 13, through which the image generated by the imaging unit 2 along a projection path 5 on a Projection surface 6, preferably the windscreen of a vehicle, projected and reflected there in the direction of the driver 4 (arrows).
- the imaging unit 2 is designed as a display which emits light not only perpendicular to its surface, but also in a solid angle area around the surface normal.
- the imaging unit 2 is preferably tilted with respect to the projection path 5, the projection path 5 being in the solid angle range in which the imaging unit 2 emits light. This prevents in a simple manner that from the outside in the projection device 3 incident light, such as sunlight, which strikes the imaging unit 2 along the projection path 3, is reflected back into the projection path 3 and perceived in the field of vision of the driver 4 as a disturbing reflex becomes.
- the projection unit has a plane mirror 12 and a concave mirror 13, which enlarges the image generated by the imaging unit 2.
- the projection unit can also contain other and / or additional and / or less optical elements, as will be explained in more detail below in connection with the examples shown in FIG. 5.
- the plane mirror 12 and the concave mirror 13 or, in the alternative embodiments, the other optical elements guide the light emitted by the imaging unit 2 along the projection path 5 until it leaves the projection unit 3. This ensures that the light is emitted in this way on the projection surface 6 generated image is sharp and sufficiently large.
- the projection surface 6 is formed by the windshield of a vehicle.
- a transparent or at least partially transparent surface can serve as the projection surface, for example a glass or plastic plate, which is arranged, for example, in front of the windshield of the vehicle.
- the light thrown onto the projection surface 6 is at least partially reflected by it in the direction of the vehicle driver 4.
- the driver 4 thereby perceives the image generated by the imaging unit 2 as a virtual image 7.
- the virtual image 7 appears enlarged relative to the image generated by the imaging unit 2.
- the imaging unit 2 can be kept small and the projection device 3 can be installed in a correspondingly space-saving manner.
- the virtual image 7 is in the natural field of view of the driver 4, so that the driver 4 can read the information represented by the image, without taking the view from the vehicle environment, for example a road section ahead of the vehicle.
- the mirrors 12 and 13 or the optical elements of the projection unit provided in alternative embodiments in the projection path 5 are designed as adaptive elements whose reflection or imaging properties are modifiable, in particular controllable during operation of the head-up display, so that eg the propagation direction of the light can be changed.
- the image of the image generated by the image generation unit 2 can be adapted to the respective visual field of the vehicle driver 4.
- the positioning of the head of the vehicle driver 4 can be taken into account.
- the projection device 3 in FIG. 1 is surrounded by a housing 8, which has an exit window 10.
- the exit window 10 is formed as a curved optical element 9, which is provided with a circular polarizer or is designed as a circular polarizer and is described below in connection with FIG. 4 in more detail.
- the exit window 10 is curved and preferably arranged such that a first, concavely curved side of the window 10 is directed toward the projection surface 6, whereas a second, convexly curved side of the window 10 in the interior Projection device 3 is located and is directed to the optical components 12 and 13 of the projection unit.
- the exit window 10 closes the housing 8 of the projection device 3 and thus acts as a cover glass for the projection device 3.
- it is removably attached to the housing 8, so that it in case of damage, such as a scratch, which may affect the representation of the virtual image 7 , easily replaceable.
- the housing 8 is installed in a preferred embodiment (not shown) in the dashboard of the vehicle, in particular behind the steering wheel, so that it does not protrude beyond the dashboard. This avoids that the field of view of the driver 4 is restricted by the housing 8. 2 shows an example to illustrate the occurrence of disturbing light reflections in the field of vision of a vehicle driver 4 in a head-up display.
- Sunlight 1 1 passes through the windscreen, which in this case forms the projection surface 6 of the head-up display, and strikes one or more surfaces of one or more optical elements of the projection device 3, which is only schematically indicated in the present illustration.
- FIG. 3 shows a further example of a head-up display 1 in a cross-sectional representation. As in the example shown in Fig.
- a curved optical element 9 which is provided with a circular polarizer or formed as a curved circular polarizer.
- a concavely curved side of the curved optical element 9 or the curved circular polarizer lies on the side of the projection surface 6, whereas the convexly curved side of the element 9 or circular polarizer lies on the side of the projection unit.
- a beam catcher 41 is provided, which is arranged between the curved optical element 9 and the projection surface 6, in particular the front screen, and which at the concave surface of the optical Elements 9 reflected light swallows, in particular, absorbed. In this way, it is reliably prevented that light incident from the outside, such as sunlight or street lighting, is projected onto the projection surface 6 after reflection at the optical element 9 and from there into the field of vision of the vehicle driver 4 and is perceived as a disturbing reflex.
- the curvature of the optical element 9 is particularly advantageous because reflected light can be bundled thereby particularly reliably on the beam catcher 41. As a result, the formation of reflections caused by scattering of the light reflected at the curved optical element 9 is prevented or at least significantly reduced.
- the optical element 9 is preferably arranged and / or curved in such a way that light striking the optical element 9, which originates from the area of the eyes of the driver 4 (so-called eyebox) and is reflected on the projection surface 6, is directed onto the beam catcher 41 , in particular bundled, is and can be absorbed there. In this way, it is reliably avoided that light which originates from the area of the eyes of the driver 4 passes through a renewed reflection on the projection surface 6 back into the eyebox of the driver.
- FIG. 4 a shows a section of a further example of a head-up display for further illustrating the mode of operation of a curved optical element 9 of the projection device 3 provided with a circular polarizer 51.
- FIG. 4 b) shows an enlarged detail of FIG the circular polarizer 51 provided curved optical element.
- the curved optical element 9 may be formed, for example, as a glass or plastic plate and its curvature obtained by casting and / or molding.
- the circular polarizer 51 preferably has a linearly polarizing element 52, for example a dichroic or birefringent film, which has a first axis in the film plane and allows components of the light passing in the direction of the first axis to be absorbed, but perpendicularly absorbed components of the light are absorbed or breaks.
- the linearly polarizing element 52 is followed by a retardation plate 53, in particular a ⁇ / 4 layer, which has a second axis and, with suitable orientation of the polarization direction of the light, delays two mutually perpendicular components of the light from each other by a phase of ⁇ / 2, whereby the polarization direction of the light passing through the retardation plate 53, with respect to a fixed point, takes the form of a helix.
- a retardation plate 53 in particular a ⁇ / 4 layer, which has a second axis and, with suitable orientation of the polarization direction of the light, delays two mutually perpendicular components of the light from each other by a phase of ⁇ / 2, whereby the polarization direction of the light passing through the retardation plate 53, with respect to a fixed point, takes the form of a helix.
- the polarizing element 52 is particularly thin and space-saving design.
- both the polarizing film 52 and the ⁇ / 4 layer 53 can be applied to the curved optical element 9 in a particularly simple and cost-effective manner by lamination.
- the linearly polarizing element 52 is also possible to form the linearly polarizing element 52 as a birefringent element, for example as a Nicols or Glan-Thomson prism.
- the linear polarization is achieved by reflection, preferably at the Brewster angle, of transparent plates, for example made of glass or plastic, arranged one behind the other and tilted with respect to the propagation direction of the light.
- parts of the outside incident unpolarized light 54 such as sunlight, are prevented from entering the projection device 3 by reflecting on the concave side of the curved optical element 9 and onto the beam catcher 41 are steered and absorbed there.
- the remaining portions of the incident light 54 pass through the optical element 9 provided with the circular polarizer 51 and are thereby converted into circularly polarized light 55.
- the optical elements 56 such as the imaging unit, a filter or a lens, arranged inside the projection unit, reflect the circularly polarized light 55 according to Fresnel's formulas to a certain degree.
- the propagation direction of the reflected circularly polarized light 57 is now the same as that of the light emitted by the imaging unit (not shown). So the reflected circularly polarized light 57 hits again on the curved optical element 9, where it first passes through the ⁇ / 4 layer 53. As a result, the reflected circularly polarized light 57 is again converted into linearly polarized light whose polarization direction is perpendicular to the first axis of the linearly polarizing element 52 lying behind it, due to the opposite propagation direction.
- the linearly polarizing element 52 acts as a filter and prevents the emergence of a large part of the reflected circularly polarized light 57, so that only a fraction of the reflected circularly polarized light 57 as a leaked linearly polarized light 58 on the projection surface 6 falls.
- the leaked linearly polarized light 58 is, however, by the described measures of so low intensity that it is no longer perceived as a disturbing reflex after reflection on the projection surface 6 in the field of vision of the driver.
- the function of the circular polarizer 51 is adapted to the angle of incidence ⁇ of the unpolarized light incident from the outside on the arched first side of the optical element 9. In this way, a weakening of the intensity of the leaked linearly polarized light 58 with respect to the incident unpolarized light 54 is achieved by a factor of 200 to 250.
- the curved and provided with a circular polarizer 51 or circular polarizer 51 designed as an exit window of the projection unit optical element 9 contributes in two respects to reduce or prevent disturbing reflections in the field of vision of the vehicle driver:
- a part of the incident light is reflected in a controlled manner on a beam catcher and thus rendered harmless, while the other part of the incident light is circularly polarized by the circular polarizer provided on the optical element or by the optical element formed as a circular polarizer and, upon reflection on one or more optical components inside the projection unit, is absorbed by the circular polarizer once again.
- the light entering the projection device 3 can be further attenuated by additionally providing surfaces of the optical elements 56, for example the front and / or back of lenses, filters or optical fibers, with an antireflection coating 59 or antireflection surface structures.
- the intensity of the reflection of the circularly polarized light 55 on such surfaces is further reduced.
- the intensity of the exiting linearly polarized light 58 with respect to the intensity of the externally incident unpolarized light 54 decreases by a factor of more than 1000, so that the extremely high brightness of incident sunlight can be sufficiently and reliably suppressed.
- FIG. 5 shows examples of optical elements which can be installed in the projection unit of the projection device 3 as an alternative or in addition to the optical elements described above.
- a magnifying image of the image by the imaging unit 2 e.g. formed as a display, emitted light through a lens 31 or a lens system having a plurality of successively arranged lenses, achieved.
- Fig. 5 b shows a multi-lens array 32, which has a plurality of small lenses 33, so-called. Lenslets, wherein all the lenslets have the same focal length and are arranged in a plane next to each other. As a result, a distribution of the light emanating from the imaging unit 2 to a plurality of channels is achieved. The lenslets used in the individual channels can thereby have a very short focal length, as a result of which the installation space required for the projection unit is significantly reduced.
- 5 c) shows a projection unit in which the image generated by the imaging unit 2 designed as a display is enlarged by a lens 34 or a lens system (not shown) and coupled into a light guide 35 and decoupled at another location. This allows flexible installation of the projection unit.
- FIG. 5 d shows an embodiment in which the projection device has only one imaging unit 2. Due to the design of the imaging unit 2 as a large display, a magnifying optical system for generating a well-recognizable virtual image 7 is not necessary. As a result, the required space is particularly small.
- Fig. 5 e shows an extension of Fig. 5 d), in which the display unit 2 formed as a display is provided with a parallax barrier 36 or a lenticular layer. Due to the parallax barrier 36 parts of the display for each one of the two angles of the two eyes of the driver 4 are hidden, so that a suitable representation of the information to be displayed on the display in the defined by the parallax barrier 36 parts of the display a stereoscopic virtual image 7 is formed. The same effect is achieved with the lenticular layer, which results from lenslets on the display, which direct the view from two different angles to different, defined parts of the display.
- the virtual image 7 can be generated at a further distance from the driver 4, so that it appears to be even better integrated into the objects in the natural field of vision of the vehicle driver 4, whereby the so-called contact analogy is further improved.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instrument Panels (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016202464.7A DE102016202464A1 (de) | 2016-02-18 | 2016-02-18 | Projektionsvorrichtung für ein Head-Up-Display, Head-Up-Display sowie Fahrzeug |
PCT/EP2017/053347 WO2017140702A1 (de) | 2016-02-18 | 2017-02-15 | Projektionsvorrichtung für ein head-up-display, head-up-display sowie fahrzeug |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3417334A1 true EP3417334A1 (de) | 2018-12-26 |
Family
ID=58046669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17705385.7A Withdrawn EP3417334A1 (de) | 2016-02-18 | 2017-02-15 | Projektionsvorrichtung für ein head-up-display, head-up-display sowie fahrzeug |
Country Status (4)
Country | Link |
---|---|
US (1) | US10739588B2 (de) |
EP (1) | EP3417334A1 (de) |
DE (1) | DE102016202464A1 (de) |
WO (1) | WO2017140702A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6402278B2 (ja) * | 2016-02-22 | 2018-10-10 | 富士フイルム株式会社 | 投写型表示装置 |
US10384645B1 (en) | 2018-02-27 | 2019-08-20 | Ford Global Technologies, Llc | Vehicle entry systems |
GB2569208B (en) * | 2018-07-19 | 2019-12-04 | Envisics Ltd | A head-up display |
JP7195168B2 (ja) * | 2019-02-08 | 2022-12-23 | 日本化薬株式会社 | 偏光板を備えた画像表示装置 |
US10996470B2 (en) * | 2019-05-21 | 2021-05-04 | GM Global Technology Operations LLC | Head-up display light trap |
JP7483355B2 (ja) * | 2019-11-27 | 2024-05-15 | 京セラ株式会社 | ヘッドアップディスプレイ、ヘッドアップディスプレイシステム及び移動体 |
JP7332495B2 (ja) * | 2020-01-31 | 2023-08-23 | マクセル株式会社 | 車両用情報表示システム及び情報表示システム |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3347271C2 (de) * | 1983-12-28 | 1986-08-28 | Daimler-Benz Ag, 7000 Stuttgart | Optische Einrichtung an Kraftfahrzeugen |
US5486840A (en) * | 1994-03-21 | 1996-01-23 | Delco Electronics Corporation | Head up display with incident light filter |
US6798579B2 (en) * | 1999-04-27 | 2004-09-28 | Optical Products Development Corp. | Real imaging system with reduced ghost imaging |
JP2012113127A (ja) * | 2010-11-25 | 2012-06-14 | Nippon Seiki Co Ltd | 表示装置 |
WO2015142654A1 (en) * | 2014-03-18 | 2015-09-24 | 3M Innovative Properties Company | Low profile image combiner for near-eye displays |
JP2015222337A (ja) * | 2014-05-23 | 2015-12-10 | 日本精機株式会社 | 表示装置 |
DE102014211339A1 (de) * | 2014-06-13 | 2015-12-17 | Continental Automotive Gmbh | Head-Up-Display mit polarisationsselektiven optischen Pfaden |
US10018840B2 (en) * | 2016-02-12 | 2018-07-10 | Lg Electronics Inc. | Head up display for vehicle |
DE102017212445A1 (de) * | 2017-07-20 | 2019-01-24 | Robert Bosch Gmbh | Head-up-Display-Einheit und Verfahren zum Herstellen einer Head-up-Display-Einheit |
-
2016
- 2016-02-18 DE DE102016202464.7A patent/DE102016202464A1/de active Pending
-
2017
- 2017-02-15 EP EP17705385.7A patent/EP3417334A1/de not_active Withdrawn
- 2017-02-15 WO PCT/EP2017/053347 patent/WO2017140702A1/de active Application Filing
-
2018
- 2018-08-17 US US16/104,498 patent/US10739588B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US10739588B2 (en) | 2020-08-11 |
US20180356634A1 (en) | 2018-12-13 |
DE102016202464A1 (de) | 2017-08-24 |
WO2017140702A1 (de) | 2017-08-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3417334A1 (de) | Projektionsvorrichtung für ein head-up-display, head-up-display sowie fahrzeug | |
WO2017084894A1 (de) | Abdeckelement zum abdecken einer projektionsöffnung eines head-up-displays, head-up-display und verfahren zum leiten von licht durch ein abdeckelement | |
DE102011075884A1 (de) | HUD mit holographischen optischen Elementen | |
EP2656122A1 (de) | Head-up-display für ein kraftfahrzeug | |
DE102016220742A1 (de) | Abtastprojektor-Durchlassschirm und Abtastprojektorsystem | |
DE102018103476B4 (de) | Frontscheibenanzeigesystem und vorrichtung mit einem frontscheibenanzeigesystem | |
DE102016226181A1 (de) | Optisches Anzeigelicht-Projektionssystem | |
DE102014211339A1 (de) | Head-Up-Display mit polarisationsselektiven optischen Pfaden | |
EP2406680B1 (de) | Winkelspiegel | |
DE102010002956A1 (de) | Head-up Display für Fahrzeuge | |
WO2014023658A2 (de) | Head-up-display | |
DE102011083662A1 (de) | Anzeigevorrichtung für einen Insassen eines Fahrzeugs und Verfahren zur Generierung einer Anzeige in einem Sichtfeld des Insassen | |
WO2021175608A1 (de) | Anordnung zur reflexionsunterdrückung bei einem frontscheibenanzeigesystem sowie frontscheibenanzeigesystem | |
DE102005020233A1 (de) | Head-Up-Display | |
DE112019004715T5 (de) | Head-up display | |
WO2022207597A1 (de) | Holographische projektionsvorrichtung | |
WO2016150713A1 (de) | Projektionsfläche, windschutzscheibe mit einer projektionsfläche sowie blickfeldanzeigevorrichtung für ein kraftfahrzeug | |
DE10139057B4 (de) | Fahrzeug-Anzeigevorrichtung | |
EP2507664B1 (de) | Projektionseinheit für ein head-up-display und verfahren zum betreiben einer projektionseinheit für ein head-up-display | |
WO2013189958A1 (de) | Vereinigungsoptik eines headup-displays und headup-display | |
EP3175277A1 (de) | Mikroskop mit einer strahlteileranordnung | |
DE102016225996A1 (de) | Projektionsanzeigevorrichtung und Verfahren zur Anzeige eines virtuellen Bildes | |
EP3367142A1 (de) | Kopf-oben-anzeigevorrichtung für ein kraftfahrzeug, kraftfahrzeug und verfahren zum anzeigen einer anzeige | |
DE102014209824A1 (de) | Projektionsvorrichtung für ein Head-up-Display, Head-up-Display sowie Fahrzeug mit einer Projektionsvorrichtung | |
DE102021207973B3 (de) | Abdeckanordnung und Head-Up-Display für ein Fortbewegungsmittel mit einer solchen Abdeckanordnung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180731 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20220124 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20220404 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230523 |