WO2022090232A1 - Head-up display with holographic slide - Google Patents

Head-up display with holographic slide Download PDF

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Publication number
WO2022090232A1
WO2022090232A1 PCT/EP2021/079692 EP2021079692W WO2022090232A1 WO 2022090232 A1 WO2022090232 A1 WO 2022090232A1 EP 2021079692 W EP2021079692 W EP 2021079692W WO 2022090232 A1 WO2022090232 A1 WO 2022090232A1
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WO
WIPO (PCT)
Prior art keywords
image
holographic
display
head
blade
Prior art date
Application number
PCT/EP2021/079692
Other languages
French (fr)
Inventor
Thomas Avisse
Soukaina CHAKIR
Stephane Gache
Pierre Mermillod
François GRANDCLERC
Original Assignee
Valeo Comfort And Driving Assistance
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Comfort And Driving Assistance filed Critical Valeo Comfort And Driving Assistance
Priority to EP21798710.6A priority Critical patent/EP4232855A1/en
Publication of WO2022090232A1 publication Critical patent/WO2022090232A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/32Holograms used as optical elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B27/0103Head-up displays characterised by optical features comprising holographic elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B27/0103Head-up displays characterised by optical features comprising holographic elements
    • G02B2027/0109Head-up displays characterised by optical features comprising holographic elements comprising details concerning the making of holograms
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0118Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G02B2027/012Head-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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0149Head-up displays characterised by mechanical features
    • G02B2027/015Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices

Definitions

  • the present invention generally relates to motor vehicle driving assistance devices.
  • a head-up display for a motor vehicle which comprises:
  • a head-up display suitable for projecting basic information (vehicle speed, direction to follow, etc.) at the level of the driver's eyes when the latter observes the road. .
  • Such a display generally comprises an image-forming device and an image-returning system which makes it possible to reflect the light beam emitted by the image-forming device towards a partially reflecting plate (commonly referred to as a "combiner" >) located in the driver's field of vision.
  • a partially reflecting plate commonly referred to as a "combiner" >
  • Such a display further comprises a housing which houses the image-forming device and the image-returning system.
  • This box is designed to be placed in the passenger compartment of the vehicle, more precisely in the dashboard of the vehicle, that is to say under the windshield.
  • the latter has a main window.
  • this main window is generally closed by a glass protection.
  • the difficulty is that the field of vision in which the information must be displayed is very large.
  • the image return system must then include a large magnifying mirror to cover the desired surface of the windshield.
  • the size of the protective glass must also be increased, which makes the above-mentioned luminosity problems even more significant.
  • the present invention proposes to replace the mirror and the protective glass with a single element providing their various functions.
  • a head-up display as defined in the introduction in which the image-returning system comprises a holographic blade which completely closes a window formed in the housing, which is arranged to directly receive the raw image generated by the image forming device and which is adapted to enlarge this raw image.
  • the holographic blade alone performs several functions, which makes it possible to reduce the size of the display.
  • the use of a holographic plate which has an image magnification function further makes it possible to reduce the size of the case.
  • the manufacturing cost of such a holographic plate turns out to be lower than that of a well-made concave mirror.
  • the return system is adapted to return the light beam from the image-forming device to the windshield of the motor vehicle;
  • said holographic blade is the only component of the return system which is suitable for magnifying said raw image
  • the image return system is formed solely from said holographic blade, the light beam from the image forming device being oriented directly towards said holographic blade and the light beam from said holographic blade being oriented directly towards the visor motor vehicle breeze;
  • the holographic blade has a function of deflecting the light beam passing through it;
  • the holographic blade has a function of distorting the light beam passing through it, said distortion being associated with a shape of a motor vehicle windscreen;
  • the holographic blade is formed by an inert plate
  • the holographic blade is formed by a flat plate
  • the image-forming device comprises at least one monochromatic light source.
  • the invention also proposes a motor vehicle comprising a passenger compartment which is closed at the front by a windshield and which internally houses a dashboard, and a head-up display as mentioned above, housed in the dashboard.
  • the holographic blade deflects the light beam directly from the image-forming device towards the windshield.
  • FIG. 1 is a view representing, in section and from the side, a head-up display according to the invention, placed in the passenger compartment of a motor vehicle.
  • FIG. 1 there is shown a head-up display 10 intended to equip any motor vehicle (car, truck ).
  • Such a motor vehicle conventionally comprises a chassis and a body which delimit a passenger compartment 70 for the driver and for the passengers of the vehicle.
  • This cabin 70 is closed at the front by a windshield 50 through which the driver can observe the road. It houses various elements, including seats and a 60 dashboard.
  • the head-up display 10 is here designed to be fixed to the dashboard 60 and to emerge from the latter through an opening 61 located opposite the windshield 50 of the vehicle.
  • This head-up display 10 comprises a box 40 which houses a computer 80 and an image forming device 20 controlled by the computer 80. An image return system is also attached to this box 40.
  • the housing 40 has outer walls which define between them an interior space. It comprises means for securing to the dashboard 60 of the vehicle, and means for fixing the image-forming device 20, the computer 80 and the image-returning system. It can for example be screwing means or any other suitable means.
  • the image forming device 20 comprises a light source 21 and an image generation system 22.
  • the light source 21 comprises at least one monochromatic source.
  • monochromatic we mean that it emits in a very small frequency band, preferably as small as possible.
  • the monochromatic source preferably emits a laser beam.
  • the light source 21 preferably comprises two (or even three) monochromatic sources emitting at distinct frequencies. One can thus provide that one of these monochromatic sources emits in the green while the other of these monochromatic sources emits in the red (the possible third monochromatic source emitting in the blue).
  • the light source 21 comprises exactly two monochromatic sources, the colors used will make it possible to display green, yellow and red information in the driver's field of vision.
  • the light source 21 comprises exactly three monochromatic sources, the colors used will make it possible to display in the driver's field of vision information of all possible colors, as well as white information.
  • the respective light beams of the monochromatic sources are preferentially combined (for example using dichroic mirrors) in order to form a polychromatic light beam (here laser) emitted at the output of the light source 21 .
  • the image generation system 22 can be of the "light modulation” type or of the "emissive” type.
  • liquid crystal display or LCD for “Liquid Crystal Display”
  • TFT thin-film transistor
  • the computer preferably, it will instead comprise a matrix of micro-mirrors that can be oriented independently of each other (one then commonly speaks of DMD or DLP technology).
  • the image generation system 22 is of the "emissive” type and that it comprises a diffuser 24 on which the images are formed and a scanning unit 23 controlled by the computer so as to deflect the laser beam in variable directions to scan the rear face of the diffuser 24.
  • the scanning unit 24 may thus for example comprise at least one movable mirror, for example in the form of a micro electromechanical system (or MEMS for "MicroElectroMechanical System” ).
  • the image forming device 20 makes it possible, under the control of the computer, to generate raw images comprising information useful for driving the vehicle, which the image return system will be able to project into the driver's field of vision when the driver's gaze is turned towards the road.
  • the image return system which is more precisely the subject of the present invention here, is more specifically designed to project a virtual image Img in the vehicle driver's field of vision. , at a distance from the driver which is greater than that separating the driver from the windshield 50 (so that the driver's eyes do not have to perform accommodation work in order to clearly perceive the road and the projected information) .
  • This image return system comprises a holographic blade 30.
  • This holographic blade 30 is designed to be traversed by the light beam from the image forming device 20. We therefore speak of a transmission hologram.
  • the holographic blade 30 has an interference pattern which makes it possible to restore a holographic image when it is illuminated by the light beam from the image-forming device 20.
  • the first of these functions is a raw image magnification function.
  • the maximum apex angle of the cone formed by the light beam from the image forming device 20 is less than the apex angle maximum of the cone formed by the virtual image.
  • the width of the light beam arriving on the windshield 50 is large, which not only makes it possible to display more information in the driver's field of vision, but which above all makes it possible to implement a augmented reality function making it possible to display elements superimposed on the environment in the driver's field of vision, in a position which precisely depends on this environment. For example, it is possible to display a flashing red triangle in the driver's field of vision, at the level of a pedestrian about to cross the road, so as to draw the driver's attention to the latter. .
  • the holographic blade 30 is preferably the only component of the head-up display 10 to ensure such a function of magnification of the raw image.
  • the image return system is composed exclusively of a single element, namely this holographic blade 30, which makes it possible to reduce its bulk and its cost.
  • the holographic plate 30 also has a function of deflecting the light beam passing through it.
  • This holographic blade 30 is thus arranged with respect to the image forming device 20 so as to directly receive the raw image generated by this image forming device 20, to magnify it and deflect it (by transmission) in a particular direction.
  • the angle of deflection of the light beam is chosen so that it takes a direction distinct from that of the parasitic light
  • the designer of the motor vehicle also has more latitude to install the head-up display 10 in the passenger compartment 70 of the vehicle, the angle of deviation possibly being adjusted so as to that the light beam coming out of the head-up display 10 is oriented towards the desired area of the windshield 50 of the motor vehicle.
  • the third function of the holographic blade 30 is a function of distortion of the light beam passing through it.
  • the windshield has a very particular curvature, which is not the same from one motor vehicle model to another. This curvature also varies from one point of the windshield to another.
  • the distortion function then makes it possible to compensate for this curvature so that the virtual image Img seen by the driver is as far as possible devoid of geometric aberration.
  • the distortion provided in the interference figure of the holographic blade 30 is then variable from one model of the motor vehicle to another, since it will be specific to the model of windshield fitted to the vehicle in which it will be installed.
  • the head-up display 10
  • the holographic blade 30 appears here in the form of a translucent and inert flat plate.
  • It is for example obtained by insolation.
  • it may be formed of a photopolymer layer coated with a hardenable protective layer making it possible to seal the interference figure printed on the photopolymer layer.
  • This impression can for example be obtained using a two-channel interferometer, in one of the channels of which a plane mirror is placed serving as a reference, and in the other of the channels of which a convex mirror is placed.
  • This convex mirror will then have to present the three aforementioned functions of magnification, deviation and distortion (by having a suitable shape and by being oriented with a desired inclination in the second channel of the interferometer).
  • interference figure could be obtained otherwise, for example by calculations and by photo-printing.
  • the holographic plate 30 and the windshield 50 allow the light beam to be returned to the driver, so as to display the virtual image Img in the driver's field of vision.
  • the light beam is therefore returned to the driver's face, on a surface (commonly referred to as an "eye box") which encompasses the driver's two eyes.
  • This surface measured in the plane in which the eyes of a driver are generally located (on average), has the overall shape of a rectangle of large dimensions, greater than 90 mm by 90 mm, here equal to 120 mm by 120 mm or 120 mm by 140 mm. In this way, whatever the position of the driver's face in this plane (shifted upwards, downwards, to the right or to the left), the driver will perceive the information displayed by the head-up display 10.
  • a holographic blade 30 makes it possible to overcome alignment constraints. Indeed, since the information stored in the holographic blade 30 is a Fourier transform, the information is repeated over the whole of the holographic blade 30 so that the driver will see the assistance information in substantially the same way. driving regardless of the position of his eyes in the aforementioned area.
  • the holographic blade 30 also makes it possible to properly control the dynamic distortion, that is to say the fact that the distortion of the perceived image varies when the driver moves his head from top to bottom or from right to left (due in particular to that the curvature of the windshield varies from point to point).
  • the holographic plate is directly attached to the case. It is here more precisely fixed in a window 41 made in the wall of the case which faces the windshield 50. It is fixed there so as to close it completely, in a dust-tight manner of more than one millimeter in diameter.
  • a partially reflecting plate commonly called a “combiner”
  • a partially reflecting plate commonly called a “combiner”
  • the holographic blade prefferably has only one or two functions (the magnification function here being the only one considered essential).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)
  • Holo Graphy (AREA)

Abstract

The invention relates to a head-up display (10) for a motor vehicle, comprising a housing (40), an image-forming device (20) housed inside the housing and designed to generate a raw image, and an image-returning system fixed to the housing. According to the invention, the image-returning system comprises a holographic slide (30) that completely closes off a window (41) formed in the housing, which is arranged to receive the raw image generated by the image-forming device and which is designed to magnify said raw image.

Description

DESCRIPTION DESCRIPTION
TITRE DE L’IN ENTION : AFFICHEUR TETE-HAUTE A LAME HOLOGRAPHIQUEINTENTION TITLE: HOLOGRAPHIC BLADE HEAD-UP DISPLAY
DOMAINE TECHNIQUE DE L'INVENTION TECHNICAL FIELD OF THE INVENTION
[0001] La présente invention concerne de manière générale les dispositifs d’aide à la conduite de véhicules automobiles. The present invention generally relates to motor vehicle driving assistance devices.
[0002] Elle concerne plus particulièrement un afficheur tête-haute pour véhicule automobile, qui comporte : [0002] It relates more particularly to a head-up display for a motor vehicle, which comprises:
- un boîtier, - a housing,
- un dispositif de formation d’images logé à l’intérieur du boîtier et adapté à générer une image brute, et - an image forming device housed inside the case and adapted to generate a raw image, and
- un système de renvoi d’images fixé au boîtier. - an image return system fixed to the case.
ETAT DE LA TECHNIQUE STATE OF THE ART
[0003] Afin de faciliter et rendre plus sûre la conduite d’un véhicule automobile, on souhaite éviter que le conducteur ne soit forcé de détourner son regard de la route qu’il emprunte lorsqu’il désire regarder le tableau de bord, par exemple pour voir la vitesse à laquelle il roule ou la direction qu’il doit emprunter pour arriver à destination. [0003] In order to make driving a motor vehicle easier and safer, it is desired to prevent the driver from being forced to look away from the road he is taking when he wishes to look at the dashboard, for example to see how fast it is going or which direction it needs to take to get to its destination.
[0004] Pour cela, il est connu d’utiliser un afficheur tête-haute, adapté à projeter des informations élémentaires (vitesse du véhicule, direction à suivre, ...) à la hauteur du regard du conducteur lorsque ce dernier observe la route. [0004] For this, it is known to use a head-up display, suitable for projecting basic information (vehicle speed, direction to follow, etc.) at the level of the driver's eyes when the latter observes the road. .
[0005] Un tel afficheur comporte généralement un dispositif de formation d’images et un système de renvoi d’images qui permet de réfléchir le faisceau lumineux émis par le dispositif de formation d’images vers une plaque partiellement réfléchissante (communément appelée « combineur >>) située dans le champ de vision du conducteur. [0005] Such a display generally comprises an image-forming device and an image-returning system which makes it possible to reflect the light beam emitted by the image-forming device towards a partially reflecting plate (commonly referred to as a "combiner" >) located in the driver's field of vision.
[0006] Un tel afficheur comprend en outre un boîtier qui loge le dispositif de formation d’image et le système de renvoi d’image. Ce boîtier est conçu pour être rapporté dans l’habitacle du véhicule, plus précisément dans la planche de bord du véhicule, c’est-à-dire sous le pare-brise. [0006] Such a display further comprises a housing which houses the image-forming device and the image-returning system. This box is designed to be placed in the passenger compartment of the vehicle, more precisely in the dashboard of the vehicle, that is to say under the windshield.
[0007] Pour permettre le passage de la lumière depuis le dispositif de formation d’images vers la lame partiellement réfléchissante qui est située à l’extérieur du boîtier, ce dernier présente une fenêtre principale. [0008] Pour éviter la chute d’objets dans le boîtier ou l’entrée de poussières à l’intérieur du boîtier, ce qui risquerait de détériorer l’un des composants de l’afficheur, cette fenêtre principale est généralement fermée par une vitre de protection. [0007] To allow the passage of light from the image-forming device to the partially reflecting blade which is located outside the housing, the latter has a main window. [0008] To prevent objects from falling into the casing or dust entering the interior of the casing, which could damage one of the components of the display, this main window is generally closed by a glass protection.
[0009] L’inconvénient majeur de cette vitre de protection est que, puisqu’elle est positionnée à proximité du pare-brise, elle est susceptible de réfléchir la lumière extérieure, notamment la lumière du soleil, ainsi que de réfracter cette lumière à l’intérieur du boîtier. Il peut alors arriver que cette lumière perturbe la lisibilité des informations projetées par l’afficheur tête-haute, voire qu’elle gêne le conducteur du véhicule. [0009] The major drawback of this protective glass is that, since it is positioned close to the windshield, it is likely to reflect outside light, in particular sunlight, as well as to refract this light at the inside the case. It may then happen that this light disturbs the readability of the information projected by the head-up display, or even that it bothers the driver of the vehicle.
[0010] Il est par ailleurs connu d’utiliser, en guise de lame partiellement réfléchissante, le pare-brise lui-même. La surface offerte par ce pare-brise étant très grande, il est alors envisageable d’implémenter une fonction de réalité augmentée permettant d’afficher dans le champ de vision du conducteur des éléments superposés à l’environnement, dans une position qui dépend justement de cet environnement. [0010] It is also known to use, as a partially reflecting strip, the windshield itself. The surface offered by this windshield being very large, it is then possible to implement an augmented reality function making it possible to display in the driver's field of vision elements superimposed on the environment, in a position which depends precisely on this environment.
[001 1] La difficulté est que le champ de vision dans lequel les informations doivent être affichées est très important. Le système de renvoi d’image doit alors comporter un miroir grossissant de grande taille pour couvrir la surface souhaitée du pare- brise. La taille de la vitre de protection doit également être agrandie, ce qui rend les problèmes de luminosité précités plus prégnants encore. [001 1] The difficulty is that the field of vision in which the information must be displayed is very large. The image return system must then include a large magnifying mirror to cover the desired surface of the windshield. The size of the protective glass must also be increased, which makes the above-mentioned luminosity problems even more significant.
[0012] Par ailleurs, ces éléments de grandes tailles génèrent un encombrement important, notamment car le miroir doit être incliné par rapport à la vitre de protection. De ce fait, le boîtier qui loge ces éléments occupe un grand volume qu’il est difficile d’implanter dans l’habitacle du véhicule lors de la conception de ce dernier. [0012] Furthermore, these large-sized elements generate significant space, in particular because the mirror must be inclined with respect to the protective glass. As a result, the box that houses these elements occupies a large volume that is difficult to fit into the passenger compartment of the vehicle during the design of the latter.
[0013] Enfin, il s’avère difficile de réaliser des miroirs aptes à réaliser le grossissement souhaité à des coûts restreints, sans générer des aberrations optiques désagréables pour le conducteur. [0013]Finally, it proves difficult to produce mirrors able to achieve the desired magnification at limited costs, without generating unpleasant optical aberrations for the driver.
PRESENTATION DE L'INVENTION PRESENTATION OF THE INVENTION
[0014] Afin de remédier aux inconvénients précités de l’état de la technique, la présente invention propose de remplacer le miroir et la vitre de protection par un unique élément assurant leurs différentes fonctions. [0015] Plus particulièrement, on propose selon l’invention un afficheur tête-haute tel que défini dans l’introduction, dans lequel le système de renvoi d’images comporte une lame holographique qui ferme entièrement une fenêtre pratiquée dans le boîtier, qui est agencée pour recevoir directement l’image brute générée par le dispositif de formation d’images et qui est adaptée à agrandir cette image brute. [0016] Ainsi, grâce à l’invention, la lame holographique assure à elle seule plusieurs fonctions, ce qui permet de réduire l’encombrement de l’afficheur. L’utilisation d’une plaque holographique qui a une fonction de grosissement d’images permet en outre de réduire la taille du boîtier. Enfin, le coût de fabrication d’une telle lame holographique s’avère moins élevé que celui d’un miroir concave de bonne facture. [0014] In order to remedy the aforementioned drawbacks of the state of the art, the present invention proposes to replace the mirror and the protective glass with a single element providing their various functions. [0015] More particularly, according to the invention, a head-up display as defined in the introduction is proposed, in which the image-returning system comprises a holographic blade which completely closes a window formed in the housing, which is arranged to directly receive the raw image generated by the image forming device and which is adapted to enlarge this raw image. [0016] Thus, thanks to the invention, the holographic blade alone performs several functions, which makes it possible to reduce the size of the display. The use of a holographic plate which has an image magnification function further makes it possible to reduce the size of the case. Finally, the manufacturing cost of such a holographic plate turns out to be lower than that of a well-made concave mirror.
[0017] D’autres caractéristiques avantageuses et non limitatives de l’afficheur tête- haute conforme à l’invention, prises individuellement ou selon toutes les combinaisons techniquement possibles, sont les suivantes : [0017] Other advantageous and non-limiting characteristics of the head-up display according to the invention, taken individually or in all technically possible combinations, are as follows:
- le système de renvoi est adapté à renvoyer le faisceau lumineux issu du dispositif de formation d’images vers le pare-brise du véhicule automobile ; - the return system is adapted to return the light beam from the image-forming device to the windshield of the motor vehicle;
- ladite lame holographique est le seul composant du système de renvoi qui est adapté à grossir ladite image brute ; - said holographic blade is the only component of the return system which is suitable for magnifying said raw image;
- le système de renvoi d’image est formé uniquement de ladite lame holographique, le faisceau lumineux issu du dispositif de formation d’images étant orienté directement vers ladite lame holographique et le faisceau lumineux issu de ladite lame holographique étant orienté directement vers le pare-brise du véhicule automobile ; - the image return system is formed solely from said holographic blade, the light beam from the image forming device being oriented directly towards said holographic blade and the light beam from said holographic blade being oriented directly towards the visor motor vehicle breeze;
- la lame holographique a une fonction de déviation du faisceau lumineux qui la traverse ; - the holographic blade has a function of deflecting the light beam passing through it;
- la lame holographique a une fonction de distorsion du faisceau lumineux qui la traverse, ladite distorsion étant associée à une forme de pare-brise de véhicule automobile ; - the holographic blade has a function of distorting the light beam passing through it, said distortion being associated with a shape of a motor vehicle windscreen;
- la lame holographique est formée par une plaque inerte ; - the holographic blade is formed by an inert plate;
- la lame holographique est formée par une plaque plane ; - the holographic blade is formed by a flat plate;
- le dispositif de formation d’images comporte au moins une source lumineuse monochromatique. - the image-forming device comprises at least one monochromatic light source.
[0018] L’invention propose également un véhicule automobile comportant un habitacle qui est fermé à l’avant par un pare-brise et qui loge intérieurement une planche de bord, et un afficheur tête-haute tel que précité, logé dans la planche de bord. [0018] The invention also proposes a motor vehicle comprising a passenger compartment which is closed at the front by a windshield and which internally houses a dashboard, and a head-up display as mentioned above, housed in the dashboard.
[0019] Préférentiellement, la lame holographique dévie le faisceau lumineux directement issu du dispositif de formation d’images vers le pare-brise. [0019] Preferably, the holographic blade deflects the light beam directly from the image-forming device towards the windshield.
[0020] Bien entendu, les différentes caractéristiques, variantes et formes de réalisation de l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres. Of course, the different characteristics, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or exclusive of each other.
DESCRIPTION DETAILLEE DE L'INVENTION DETAILED DESCRIPTION OF THE INVENTION
[0021] La description qui va suivre en regard des dessins annexés, donnés à titre d’exemples non limitatifs, fera bien comprendre en quoi consiste l’invention et comment elle peut être réalisée. The following description with reference to the accompanying drawings, given by way of non-limiting examples, will make it clear what the invention consists of and how it can be implemented.
[0022] Sur les dessins annexés : [0022] In the accompanying drawings:
[0023] [Fig. 1 ] est une vue représentant, en coupe et de côté, un afficheur tête- haute conforme à l’invention, placé dans l’habitacle d’un véhicule automobile. [0023] [Fig. 1] is a view representing, in section and from the side, a head-up display according to the invention, placed in the passenger compartment of a motor vehicle.
[0024] Sur la figure 1 , on a représenté un afficheur tête-haute 10 destiné à équiper un véhicule automobile quelconque (voiture, camion...). In Figure 1, there is shown a head-up display 10 intended to equip any motor vehicle (car, truck ...).
[0025] Un tel véhicule automobile comporte classiquement un châssis et une carrosserie qui délimitent un habitacle 70 pour le conducteur et pour les passagers du véhicule. [0025] Such a motor vehicle conventionally comprises a chassis and a body which delimit a passenger compartment 70 for the driver and for the passengers of the vehicle.
[0026] Cet habitacle 70 est fermé à l’avant par un pare-brise 50 au travers duquel le conducteur peut observer la route. Il loge différents éléments, parmi lesquels des sièges et une planche de bord 60. This cabin 70 is closed at the front by a windshield 50 through which the driver can observe the road. It houses various elements, including seats and a 60 dashboard.
[0027] L’afficheur tête-haute 10 est ici conçu pour être fixé à la planche de bord 60 et pour émerger de ce dernier par une ouverture 61 située en regard du pare-brise 50 du véhicule. The head-up display 10 is here designed to be fixed to the dashboard 60 and to emerge from the latter through an opening 61 located opposite the windshield 50 of the vehicle.
[0028] Cet afficheur tête-haute 10 comprend un boîtier 40 qui loge un calculateur 80 et un dispositif de formation d’image 20 piloté par le calculateur 80. Un système de renvoi d’images est également fixé à ce boîtier 40. This head-up display 10 comprises a box 40 which houses a computer 80 and an image forming device 20 controlled by the computer 80. An image return system is also attached to this box 40.
[0029] Le boîtier 40 comporte des parois externes qui délimitent entre elles un espace intérieur. Il comporte des moyens d’assujettissement à la planche de bord 60 du véhicule, et des moyens de fixation du dispositif de formation d’image 20, du calculateur 80 et du système de renvoi d’images. Il peut par exemple s’agir de moyens de vissage ou de tout autre moyen adapté. The housing 40 has outer walls which define between them an interior space. It comprises means for securing to the dashboard 60 of the vehicle, and means for fixing the image-forming device 20, the computer 80 and the image-returning system. It can for example be screwing means or any other suitable means.
[0030] Comme le montre la figure 1 , le dispositif de formation d’images 20 comporte une source de lumière 21 et un système de génération d’images 22. As shown in Figure 1, the image forming device 20 comprises a light source 21 and an image generation system 22.
[0031 ] La source de lumière 21 comprend au moins une source monochromatique. Par monochromatique, on entend qu’elle émet dans une bande de fréquences très réduite, de préférence aussi réduite que possible. Ici, la source monochromatique émet de préférence un faisceau laser. [0031] The light source 21 comprises at least one monochromatic source. By monochromatic, we mean that it emits in a very small frequency band, preferably as small as possible. Here, the monochromatic source preferably emits a laser beam.
[0032] La source de lumière 21 comporte, de préférence, deux (voire trois) sources monochromatiques émettant à des fréquences bien distinctes. On peut ainsi prévoir que l’une de ces sources monochromatiques émette dans le vert tandis que l’autre de ces sources monochromatiques émet dans le rouge (l’éventuelle troisième source monochromatique émettant dans le bleu). The light source 21 preferably comprises two (or even three) monochromatic sources emitting at distinct frequencies. One can thus provide that one of these monochromatic sources emits in the green while the other of these monochromatic sources emits in the red (the possible third monochromatic source emitting in the blue).
[0033] Si la source de lumière 21 comporte exactement deux sources monochromatiques, les couleurs employées permettront d’afficher dans le champ de vision du conducteur des informations vertes, jaunes et rouges. If the light source 21 comprises exactly two monochromatic sources, the colors used will make it possible to display green, yellow and red information in the driver's field of vision.
[0034] Si la source de lumière 21 comporte exactement trois sources monochromatiques, les couleurs employées permettront d’afficher dans le champ de vision du conducteur des informations de toutes les couleurs possibles, ainsi que des informations blanches. If the light source 21 comprises exactly three monochromatic sources, the colors used will make it possible to display in the driver's field of vision information of all possible colors, as well as white information.
[0035] Les faisceaux lumineux respectifs des sources monochromatiques sont préférentiellement combinés (par exemple à l’aide de miroirs dichroïques) afin de former un faisceau lumineux polychromatique (ici laser) émis en sortie de la source de lumière 21 . The respective light beams of the monochromatic sources are preferentially combined (for example using dichroic mirrors) in order to form a polychromatic light beam (here laser) emitted at the output of the light source 21 .
[0036] Le système de génération d’images 22 peut être du type « à modulation de lumière » ou du type « émissif ». The image generation system 22 can be of the "light modulation" type or of the "emissive" type.
[0037] S’il est du type « à modulation de lumière » , il pourrait comprendre un écran à cristaux liquides (ou LCD pour "Liquid Crystal Display") à transistors en couche mince (ou TFT pour "Thin-Film Transistor"), piloté par le calculateur. Toutefois, de préférence, il comprendra plutôt une matrice de micro-miroirs orientables indépendamment les uns des autres (on parle alors communément de technologie DMD ou DLP). If it is of the "light modulation" type, it could include a liquid crystal display (or LCD for "Liquid Crystal Display") with thin-film transistors (or TFT for "Thin-Film Transistor") , controlled by the computer. However, preferably, it will instead comprise a matrix of micro-mirrors that can be oriented independently of each other (one then commonly speaks of DMD or DLP technology).
[0038] On considérera ici que le système de génération d’images 22 est du type « émissif » et qu’il comprend un diffuseur 24 sur laquelle les images se forment et une unité de balayage 23 pilotée par le calculateur de façon à dévier le faisceau laser dans des directions variables pour balayer la face arrière du diffuseur 24. L’unité de balayage 24 pourra ainsi par exemple comprendre au moins un miroir mobile, se présentant par exemple sous la forme d’un microsystème électromécanique (ou MEMS pour "MicroElectroMechanical System"). It will be considered here that the image generation system 22 is of the "emissive" type and that it comprises a diffuser 24 on which the images are formed and a scanning unit 23 controlled by the computer so as to deflect the laser beam in variable directions to scan the rear face of the diffuser 24. The scanning unit 24 may thus for example comprise at least one movable mirror, for example in the form of a micro electromechanical system (or MEMS for "MicroElectroMechanical System" ).
[0039] Quel que soit son type, le dispositif de formation d’images 20 permet, sous le contrôle du calculateur, de générer des images brutes comprenant des informations utiles à la conduite du véhicule, que le système de renvoi d’images va pouvoir projeter dans le champ de vision du conducteur lorsque le regard de ce dernier est tourné vers la route. Whatever its type, the image forming device 20 makes it possible, under the control of the computer, to generate raw images comprising information useful for driving the vehicle, which the image return system will be able to project into the driver's field of vision when the driver's gaze is turned towards the road.
[0040] Comme le montre la figure 1 , le système de renvoi d’images, qui fait plus précisément ici l’objet de la présente invention, est plus spécifiquement conçu pour projeter une image virtuelle Img dans le champ de vision du conducteur du véhicule, à une distance du conducteur qui est supérieure à celle séparant le conducteur du pare-brise 50 (si bien que les yeux du conducteur n’ont pas à effectuer de travail d’accommodation pour percevoir de manière nette la route et les informations projetées). As shown in Figure 1, the image return system, which is more precisely the subject of the present invention here, is more specifically designed to project a virtual image Img in the vehicle driver's field of vision. , at a distance from the driver which is greater than that separating the driver from the windshield 50 (so that the driver's eyes do not have to perform accommodation work in order to clearly perceive the road and the projected information) .
[0041] Ce système de renvoi d’images comporte une lame holographique 30. This image return system comprises a holographic blade 30.
[0042] Cette lame holographique 30 est prévue pour être traversée par le faisceau lumineux issu du dispositif de formation d’images 20. On parle donc d’hologramme de transmission. This holographic blade 30 is designed to be traversed by the light beam from the image forming device 20. We therefore speak of a transmission hologram.
[0043] Elle est prévue pour recevoir directement l’image brute émise par le dispositif de formation d’images 20. Par « directement », on entend qu’aucun composant optique ne se trouve entre le dispositif de formation d’images 20 et cette lame holographique 30. It is designed to directly receive the raw image emitted by the image forming device 20. By "directly", we mean that no optical component is located between the image forming device 20 and this holographic blade 30.
[0044] La lame holographique 30 présente une figure d’interférence qui permet de restituer une image holographique lorsqu’elle est éclairée par le faisceau lumineux issu du dispositif de formation d’images 20. [0044] The holographic blade 30 has an interference pattern which makes it possible to restore a holographic image when it is illuminated by the light beam from the image-forming device 20.
[0045] Elle est plus précisément prévue pour déformer l’image brute affichée par le dispositif de formation d’images 20 d’une manière particulière. Elle présente à cet effet différentes « fonctions ». It is more specifically provided to distort the raw image displayed by the image forming device 20 in a particular way. It has different “functions” for this purpose.
[0046] La première de ces fonctions est une fonction de grossissement de l’image brute. The first of these functions is a raw image magnification function.
[0047] Ainsi, l’angle au sommet maximum du cône formé par le faisceau lumineux issu du dispositif de formation d’images 20 est inférieur à l’angle au sommet maximum du cône formé par l’image virtuelle. Thus, the maximum apex angle of the cone formed by the light beam from the image forming device 20 is less than the apex angle maximum of the cone formed by the virtual image.
[0048] De cette manière, la largeur du faisceau lumineux arrivant sur le pare-brise 50 est grande, ce qui permet non seulement d’afficher davantage d’informations dans le champ de vision du conducteur, mais qui permet surtout d’implémenter une fonction de réalité augmentée permettant d’afficher dans le champ de vision du conducteur des éléments superposés à l’environnement, dans une position qui dépend justement de cet environnement. A titre d’exemple, il est possible d’afficher un triangle rouge clignotant dans le champ de vision du conducteur, au niveau d’un piéton s’apprêtant à traverser la route, de façon à attirer l’attention du conducteur sur ce dernier. In this way, the width of the light beam arriving on the windshield 50 is large, which not only makes it possible to display more information in the driver's field of vision, but which above all makes it possible to implement a augmented reality function making it possible to display elements superimposed on the environment in the driver's field of vision, in a position which precisely depends on this environment. For example, it is possible to display a flashing red triangle in the driver's field of vision, at the level of a pedestrian about to cross the road, so as to draw the driver's attention to the latter. .
[0049] On notera ici que la lame holographique 30 est de préférence le seul composant de l’afficheur tête-haute 10 à assurer une telle fonction de grossissement de l’image brute. It will be noted here that the holographic blade 30 is preferably the only component of the head-up display 10 to ensure such a function of magnification of the raw image.
[0050] D’ailleurs, de façon préférentielle, le système de renvoi d’image est composé exclusivement d’un seul élément, à savoir de cette lame holographique 30, ce qui permet de réduire son encombrement et son coût. [0050] Moreover, preferably, the image return system is composed exclusively of a single element, namely this holographic blade 30, which makes it possible to reduce its bulk and its cost.
[0051] Préférentiellement, la lame holographique 30 a également une fonction de déviation du faisceau lumineux qui la traverse. Preferably, the holographic plate 30 also has a function of deflecting the light beam passing through it.
[0052] En d’autres termes, si on considère, d’une part, l’axe moyen du faisceau lumineux qui est émis par le dispositif de formation d’images 20 et qui arrive sur cette lame, et, d’autre part, l’axe du faisceau lumineux qui ressort de la lame holographique 30, on constate que ces deux axes sont inclinés l’un par rapport à l’autre. In other words, if we consider, on the one hand, the mean axis of the light beam which is emitted by the image-forming device 20 and which arrives at this blade, and, on the other hand , the axis of the light beam which emerges from the holographic blade 30, it can be seen that these two axes are inclined relative to each other.
[0053] Cette lame holographique 30 est ainsi agencée par rapport au dispositif de formation d’images 20 de manière à recevoir directement l’image brute générée par ce dispositif de formation d’images 20, pour la grossir et la dévier (par transmission) dans une direction particulière. This holographic blade 30 is thus arranged with respect to the image forming device 20 so as to directly receive the raw image generated by this image forming device 20, to magnify it and deflect it (by transmission) in a particular direction.
[0054] Dans le cas ici considéré, l’angle de déviation du faisceau lumineux est choisi de façon à ce qu’il prenne une direction distincte de celle des lumières parasites In the case considered here, the angle of deflection of the light beam is chosen so that it takes a direction distinct from that of the parasitic light
[0055] Grâce à cette fonction de déviation, le concepteur du véhicule automobile dispose en outre de davantage de latitude pour implanter l’afficheur tête-haute 10 dans l’habitacle 70 du véhicule, l’angle de déviation pouvant éventuellement être ajusté de façon que le faisceau lumineux qui sort de l’afficheur tête-haute 10 soit orientée vers la zone souhaitée du pare-brise 50 du véhicule automobile. [0055] Thanks to this deviation function, the designer of the motor vehicle also has more latitude to install the head-up display 10 in the passenger compartment 70 of the vehicle, the angle of deviation possibly being adjusted so as to that the light beam coming out of the head-up display 10 is oriented towards the desired area of the windshield 50 of the motor vehicle.
[0056] La troisième fonction de la lame holographique 30 est une fonction de distorsion du faisceau lumineux qui la traverse. The third function of the holographic blade 30 is a function of distortion of the light beam passing through it.
[0057] En effet, le pare-brise présente une courbure bien particulière, qui n’est pas la même d’un modèle de véhicule automobile à l’autre. Cette courbure varie en outre d’un point à l’autre du pare-brise. [0057] Indeed, the windshield has a very particular curvature, which is not the same from one motor vehicle model to another. This curvature also varies from one point of the windshield to another.
[0058] La fonction de distorsion permet alors de compenser cette courbure de façon que l’image virtuelle Img vue par le conducteur soit autant que possible dépourvue d’aberration géométrique. The distortion function then makes it possible to compensate for this curvature so that the virtual image Img seen by the driver is as far as possible devoid of geometric aberration.
[0059] La distorsion prévue dans la figure d’interférence de la lame holographique 30 est alors variable d’un modèle du véhicule automobile à l’autre, puisqu’elle sera propre au modèle de pare-brise équipant le véhicule dans lequel sera installé l’afficheur tête-haute 10, The distortion provided in the interference figure of the holographic blade 30 is then variable from one model of the motor vehicle to another, since it will be specific to the model of windshield fitted to the vehicle in which it will be installed. the head-up display 10,
[0060] En pratique, la lame holographique 30 se présente ici sous la forme d’une plaque plane translucide et inerte. In practice, the holographic blade 30 appears here in the form of a translucent and inert flat plate.
[0061 ] Elle est par exemple obtenue par insolation. A titre d’exemple, elle peut être formée d’une couche photopolymère revêtue d’une couche de protection durcissable permettant de sceller la figure d’interférence imprimée sur la couche photopolymère. [0061] It is for example obtained by insolation. By way of example, it may be formed of a photopolymer layer coated with a hardenable protective layer making it possible to seal the interference figure printed on the photopolymer layer.
[0062] Cette impression peut par exemple être obtenue à l’aide d’un interféromètre à deux voies, dans une des voies duquel on place un miroir plan servant de référence, et dans l’autre des voies duquel on place un miroir convexe. This impression can for example be obtained using a two-channel interferometer, in one of the channels of which a plane mirror is placed serving as a reference, and in the other of the channels of which a convex mirror is placed.
[0063] Ce miroir convexe devra alors présenter les trois fonctions précitées de grossissement, de déviation et de distorsion (en ayant une forme adaptée et en étant orienté avec une inclinaison souhaitée dans la seconde voie de l’interféromètre). [0063] This convex mirror will then have to present the three aforementioned functions of magnification, deviation and distortion (by having a suitable shape and by being oriented with a desired inclination in the second channel of the interferometer).
[0064] Bien entendu, la figure d’interférence pourrait être obtenue autrement, par exemple par calculs et par photo-impression. Of course, the interference figure could be obtained otherwise, for example by calculations and by photo-printing.
[0065] Comme le montre la figure 1 , la plaque holographique 30 et le pare-brise 50 permettent de renvoyer le faisceau lumineux vers le conducteur, de façon à afficher l’image virtuelle Img dans le champ de vision du conducteur. As shown in Figure 1, the holographic plate 30 and the windshield 50 allow the light beam to be returned to the driver, so as to display the virtual image Img in the driver's field of vision.
[0066] Le faisceau lumineux est pour cela renvoyée vers le visage du conducteur, sur une surface (communément appelée « eye box ») qui englobe les deux yeux du conducteur. [0067] Cette surface, mesurée dans le plan dans lequel se trouve généralement (en moyenne) les yeux d’un conducteur, présente une forme globale de rectangle de dimensions importantes, supérieures à 90 mm par 90 mm, ici égales à 120 mm par 120 mm ou à 120 mm par 140 mm. De cette façon, quelle que soit la position du visage du conducteur dans ce plan (décalé vers le haut, le bas, la droite ou la gauche), le conducteur percevra les informations affichées par l’afficheur tête-haute 10. [0066] The light beam is therefore returned to the driver's face, on a surface (commonly referred to as an "eye box") which encompasses the driver's two eyes. This surface, measured in the plane in which the eyes of a driver are generally located (on average), has the overall shape of a rectangle of large dimensions, greater than 90 mm by 90 mm, here equal to 120 mm by 120 mm or 120 mm by 140 mm. In this way, whatever the position of the driver's face in this plane (shifted upwards, downwards, to the right or to the left), the driver will perceive the information displayed by the head-up display 10.
[0068] A ce sujet, on notera que l’utilisation d’une lame holographique 30 permet de s'affranchir des contraintes d'alignement. En effet, puisque l'information stockée dans la lame holographique 30 est une transformée de Fourrier, l'information est répétée sur l'ensemble de la lame holographique 30 si bien que le conducteur verra sensiblement de la même façon les informations d’aide à la conduite quelle que soit la position de ses yeux dans la surface précitée. La lame holographique 30 permet également de bien contrôler la distorsion dynamique, c’est-à-dire le fait que la distorsion de l’image perçue varie lorsque le conducteur bouge sa tète de haut en bas ou de droite à gauche (du fait notamment que la courbure du pare-brise varie d’un point à l’autre). On this subject, it will be noted that the use of a holographic blade 30 makes it possible to overcome alignment constraints. Indeed, since the information stored in the holographic blade 30 is a Fourier transform, the information is repeated over the whole of the holographic blade 30 so that the driver will see the assistance information in substantially the same way. driving regardless of the position of his eyes in the aforementioned area. The holographic blade 30 also makes it possible to properly control the dynamic distortion, that is to say the fact that the distortion of the perceived image varies when the driver moves his head from top to bottom or from right to left (due in particular to that the curvature of the windshield varies from point to point).
[0069] Ici, comme le montre la figure 1 , la plaque holographique est directement fixée au boîtier. Elle est ici plus précisément fixée dans une fenêtre 41 pratiquée dans la paroi du boîtier qui fait face au pare-brise 50. Elle y est fixée de façon à la fermer entièrement, de manière étanche aux poussières de plus d’un millimètre de diamètre. [0069] Here, as shown in Figure 1, the holographic plate is directly attached to the case. It is here more precisely fixed in a window 41 made in the wall of the case which faces the windshield 50. It is fixed there so as to close it completely, in a dust-tight manner of more than one millimeter in diameter.
[0070] Elle est ici fixée dans le plan de cette fenêtre 41 , mais elle pourrait en variante être fixée contre la face interne ou contre la face externe du boîtier 40. [0070] It is here fixed in the plane of this window 41, but it could alternatively be fixed against the internal face or against the external face of the housing 40.
[0071] La présente invention n’est nullement limitée au mode de réalisation décrit et représenté, mais l’homme du métier saura y apporter toute variante conforme à l’invention. The present invention is in no way limited to the embodiment described and represented, but those skilled in the art will know how to make any variant in accordance with the invention.
[0072] A titre d’exemple, il serait possible d’utiliser une lame partiellement réfléchissante (communément appelée « combineur ») pour réfléchir le faisceau lumineux qui sort de l’afficheur tête-haute 10 dans le champ de vision du conducteur. [0072] For example, it would be possible to use a partially reflecting plate (commonly called a “combiner”) to reflect the light beam that comes out of the head-up display 10 into the driver's field of vision.
Selon une autre variante de l’invention, on pourrait prévoir que la lame holographique présente seulement une ou deux fonctions (la fonction de grossissement étant ici la seule considérée comme essentielle). According to another variant of the invention, provision could be made for the holographic blade to have only one or two functions (the magnification function here being the only one considered essential).

Claims

REVENDICATIONS
[Revendication 1] Afficheur tête-haute (10) pour véhicule automobile, comportant : [Claim 1] Head-up display (10) for a motor vehicle, comprising:
- un boîtier (40), - a box (40),
- un dispositif de formation d’images (20) logé à l’intérieur du boîtier (40) et adapté à générer une image brute, et - an image forming device (20) housed inside the housing (40) and adapted to generate a raw image, and
- un système de renvoi d’images fixé au boîtier (40), caractérisé en ce que le système de renvoi d’images comporte une lame holographique (30) qui ferme entièrement une fenêtre (41 ) pratiquée dans le boîtier (40), qui est agencée pour recevoir directement l’image brute générée par le dispositif de formation d’images (20) et qui est adaptée à grossir ladite image brute. - an image return system fixed to the housing (40), characterized in that the image return system comprises a holographic blade (30) which completely closes a window (41) formed in the housing (40), which is arranged to directly receive the raw image generated by the image forming device (20) and which is adapted to magnify said raw image.
[Revendication 2] Afficheur tête-haute (10) selon la revendication précédente, dans lequel, le système de renvoi étant adapté à renvoyer le faisceau lumineux issu du dispositif de formation d’images (20) vers le pare-brise (50) du véhicule automobile, ladite lame holographique (30) est le seul composant du système de renvoi qui est adapté à grossir ladite image brute. [Claim 2] Head-up display (10) according to the preceding claim, in which, the return system being adapted to return the light beam coming from the image-forming device (20) towards the windscreen (50) of the motor vehicle, said holographic blade (30) is the only component of the return system which is adapted to magnify said raw image.
[Revendication 3] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel le système de renvoi d’image est formé uniquement de ladite lame holographique (30), le faisceau lumineux issu du dispositif de formation d’images (20) étant orienté directement vers ladite lame holographique (30) et le faisceau lumineux issu de ladite lame holographique (30) étant orienté directement vers le pare-brise (50) du véhicule automobile. [Claim 3] Head-up display (10) according to one of the preceding claims, in which the image return system is formed solely of said holographic plate (30), the light beam issuing from the image-forming device (20) being oriented directly towards said holographic blade (30) and the light beam from said holographic blade (30) being oriented directly towards the windshield (50) of the motor vehicle.
[Revendication 4] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel la lame holographique (30) a une fonction de déviation du faisceau lumineux qui la traverse. [Claim 4] Head-up display (10) according to one of the preceding claims, in which the holographic blade (30) has a function of deflecting the light beam passing through it.
[Revendication 5] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel la lame holographique (30) a une fonction de distorsion du faisceau lumineux qui la traverse, ladite distorsion étant associée à une forme de pare-brise (50) de véhicule automobile. [Claim 5] Head-up display (10) according to one of the preceding claims, in which the holographic blade (30) has a function of distorting the light beam passing through it, said distortion being associated with a shape of (50) motor vehicle.
[Revendication 6] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel la lame holographique (30) est formée par une plaque inerte. [Claim 6] Head-up display (10) according to one of the preceding claims, in which the holographic blade (30) is formed by a inert plate.
[Revendication 7] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel la lame holographique (30) est formée par une plaque plane. [Claim 7] Head-up display (10) according to one of the preceding claims, in which the holographic plate (30) is formed by a flat plate.
[Revendication 8] Afficheur tête-haute (10) selon l’une des revendications précédentes, dans lequel le dispositif de formation d’images (20) comporte au moins une source lumineuse monochromatique. [Claim 8] Head-up display (10) according to one of the preceding claims, in which the imaging device (20) comprises at least one monochromatic light source.
[Revendication 9] Véhicule automobile comportant un habitacle (70) fermé à l’avant par un pare-brise (50) et qui loge intérieurement une planche de bord (60), caractérisé en ce qu’il comporte un afficheur tête-haute (10) conforme à l’une des revendications précédentes, logé dans la planche de bord (60). [Claim 9] Motor vehicle comprising a passenger compartment (70) closed at the front by a windscreen (50) and which internally houses a dashboard (60), characterized in that it comprises a head-up display ( 10) according to one of the preceding claims, housed in the dashboard (60).
[Revendication 10] Véhicule automobile selon la revendication précédente, dans lequel la lame holographique (30) dévie le faisceau lumineux directement issu du dispositif de formation d’images (20) vers le pare-brise. [Claim 10] Motor vehicle according to the preceding claim, in which the holographic blade (30) deflects the light beam directly coming from the image-forming device (20) towards the windshield.
PCT/EP2021/079692 2020-10-26 2021-10-26 Head-up display with holographic slide WO2022090232A1 (en)

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Citations (5)

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