(19)
(11)EP 3 129 706 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
26.06.2019 Bulletin 2019/26

(21)Application number: 15714420.5

(22)Date of filing:  09.04.2015
(51)International Patent Classification (IPC): 
G02B 27/01(2006.01)
B60K 35/00(2006.01)
H04N 9/31(2006.01)
G03B 21/16(2006.01)
B60K 37/02(2006.01)
(86)International application number:
PCT/EP2015/000751
(87)International publication number:
WO 2015/154879 (15.10.2015 Gazette  2015/41)

(54)

HEAD UP DISPLAY PROJECTING VISUAL INFORMATION ONTO A SCREEN

HEAD-UP-ANZEIGE ZUR PROJEKTION VON VISUELLEN INFORMATIONEN AUF EINEN SCHIRM

DISPOSITIF D'AFFICHAGE TÊTE HAUTE PROJETANT DES INFORMATIONS VISUELLES SUR UN ÉCRAN


(84)Designated Contracting States:
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

(30)Priority: 10.04.2014 EP 14164208

(43)Date of publication of application:
15.02.2017 Bulletin 2017/07

(73)Proprietor: Johnson Controls Automotive Electronics SAS
95892 Cergy-Pontoise Cedex (FR)

(72)Inventors:
  • HENON, Fabrice
    95800 Cergy (FR)
  • LAMBERT, Yves
    95520 Osny (FR)
  • LOUVIEAUX, Nicolas
    60240 Parnes (FR)
  • HASAN, Shenol
    1700 Sofia (BG)
  • ANDREEV, Dimitar
    1013 Sofia (BG)

(74)Representative: Loock, Jan Pieter et al
Kutzenberger Wolff & Partner Waidmarkt 11
50676 Köln
50676 Köln (DE)


(56)References cited: : 
JP-A- H0 811 580
JP-A- 2009 169 399
US-A1- 2006 285 080
JP-A- 2007 086 387
JP-A- 2009 288 484
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Background



    [0001] The present invention relates to a head up display that projects visual information onto a screen.

    [0002] Such head up displays are typically integrated into a vehicle dashboard and are intended to supply a passenger of the vehicle with information such as the current vehicle speed, the fuel gauge and/or warnings, for example. Typically, the visual information is projected onto a mirror or a combiner that is reversibly transformable between a usage position and a non-usage position.

    [0003] In general, it is essential to realize a compact head up display due to the limited space in front of the passenger. It is therefore reliable to arrange the components of the head up display directly next to each other. As a consequence, the space between a kinematic device (for transforming the combiner between the usage and the non-usage position) and a liquid crystal device, such as a TFT-display, is limited. This space is, however, provided for a light source that generates the backlight for illuminating the TFT-display as it is needed for projecting the visual information generated by the TFT-display onto the screen. Consequently, heat being generated by the light source of the operating head up display influences the TFT-display negatively and can even destroy it. Conventional head up displays are disclosed in JP 2009 288484, JP 2007 086387, JP H08 11580, JP 2009 169399 and US 2006/285080.

    Summary



    [0004] It is therefore the objective of the present invention to provide a head up display with a projector unit, wherein the heat of the operating projector unit is reduced without giving up the positive effect of arranging a heat generating light source and a liquid crystal device, which is affected by the heat, next to each other.

    [0005] The problem of the present invention is solved by a head up display as defined in independent claim 1.

    [0006] In contrast to the state of the art, it is herewith advantageously possible to reduce the heat of the projector unit by the global radiator such that a proper operating of the head up display is possible. Thus, a potential defect that can be otherwise caused by the heat originating from the light source can be avoided. Furthermore, it is possible to use such a powerful light source as a backlight for the light modulation device, that the screen is illuminated uniformly and reaches an illumination of at least 6000 Cd/m2.

    [0007] Preferably, it is provided that the light modulation device generates the visual information that is projected onto the screen by illuminating the light modulating device using the backlight of the light source. In particular, the light modulating device is at least partially transparent and the light from the light source, namely the backlight, passes the light modulation device at least partially. Preferably, at least a part of the light modulating device changes its transparency and/or color whenever the visual information has to be modified. Thus, the modulating device modulates the light of the light source corresponding to the visual information. Furthermore, it is provided that the global radiator device reduces the heat of at least two components of the projector unit by contacting them respectively.

    [0008] According to another embodiment of the present invention, it is provided that the light source is integrated into a printed circuit board. By using the liquid crystal display such as a TFT (thin film transistor)-display a light modulation device is provided that can generate the visual information. In particular, it is provided that the global radiator guarantees that the temperature of the TFT-display is below 95° C and therefore a damage caused by the heat of the TFT-display may be avoided. Furthermore, it is provided that the light from the light source passes the liquid crystal display for projecting the visual information generated by the liquid crystal device onto the screen. In particular, it is possible to change the visual information rapidly by controlling the liquid crystal display. For this purpose, the liquid crystal display is preferably connected to a control unit that determinates the information that should be generated by the light modulation device. Furthermore, it is provided that the light modulation device comprises a component, such as a lens, an aperture or a lens system, that modifies the light emitted by the light source for a preferably uniform illumination of the screen. As a consequence, the quality of the projected visual information is further raised. Furthermore, it is provided that the light source is a LED that is preferably integrated into a printed circuit board. Such a light source is small sized and easy to handle advantageously.

    [0009] According to a preferred embodiment it is provided that the projecting device is at least partially framed by the global radiator. By framing the projecting device the global radiator is able to cool jointly several, in particular all, components of the projecting device that requires cooling. Preferably the global radiator extends at least partially along the periphery of the projecting device. It is also thinkable that the global radiator covers more than 15 %, preferably more than 25 % and more preferably more than 40 % of the projecting device. In particular the projection device is almost completely framed by the global projecting device. According to another embodiment of the present invention, it is provided that the screen is a combiner and/or a mirror. In particular, the screen is designed such that the projected visual information is at least partially reflected back to the passenger or at least partially transmitted to the passenger. Using a semi-transparent screen such as a combiner has the advantage that the field of view of the passenger is not restricted significantly.

    [0010] It is provided that the global radiator contacts both the light source and the light modulation component. In particular, the global radiator contacts the light source, the lens and the TFT-display in order to realize an effective cooling of all essential parts of the projector unit.

    [0011] According to another embodiment of the present invention, it is provided that the screen is part of a windscreen and/or is reversibly transferable by a kinematic device between an usage position and a non-usage position. Thereby a space-saving head up display is realized advantageously. In particular, the kinematic device comprises a gearing mechanism and the screen is movably connected to a housing of the head up display. In particular, the screen is pivoted and/or shifted for transferring the screen between the usage position and the non-usage position.

    [0012] According to another embodiment of the present invention, it is provided that the projector unit is arranged below the screen in the usage position. That provides a compact head up display.

    [0013] According to another embodiment of the present invention, it is provided that the head up display has another mirror for forwarding the generated visual information from the projector unit to the screen. Thereby the projector unit can be located directly below the combiner and/or mirror.

    [0014] It is provided that the lens is arranged between the light sources and the liquid crystal display, wherein the lens is arranged inside the global radiator. In particular, it is provided that the lens, the light source and the liquid crystal display are framed by the global radiator. It is herewith possible to generate a compact and robust projector unit.

    [0015] According to another embodiment of the present invention, it is provided that the global radiator has

    -- a ripped design and/or

    -- an additional fan. Such a configuration of the global radiator advantageously increases the capability of the global radiator for cooling the projector unit at least partially. The ripped design increases the surface that can emit the heat being collected by the global radiator. Global radiators having a high thermal conductivity are preferably effective global radiators. According to another embodiment of the present invention, it is provided that the global radiator comprises at least partially Aluminum. Aluminum has a high thermal conductivity. A radiator having Aluminum is therefore an effective global radiator.



    [0016] According to another embodiment of the present invention, it is provided that the projector unit is arranged immediately adjacent to the screen in its non-usage position. It is herewith advantageously possible to realize a head up display that is designed such that it can be easily integrated into a vehicle. In such a case the global radiator allows using a powerful light source for a desired screen illumination without jeopardizing the liquid crystal device. According to another embodiment of the present invention, it is provided that the head up display is part of a vehicle dashboard. Preferably, the head up display is arranged in front of the passenger. It is therefore advantageously possible to localize the combiner within the field of view of the passenger.

    [0017] Another subject of the present invention is a vehicle dashboard having a head up display as it is described before.

    [0018] Another subject of the present invention is a vehicle having a head up display as it is described before.

    [0019] These and other characteristics, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. The description is given for the sake of example only, without limiting the scope of the invention. The reference figures quoted below refer to the attached drawings.

    Brief description of the drawings



    [0020] 

    Figure 1 shows a head up display according to a first exemplary embodiment of the present invention in a perspective view.

    Figure 2 shows the head up display according to the first exemplary embodiment of the present invention in a sectional view.


    Detailed description



    [0021] The present invention will be descripted with respect to particular embodiments and with the reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some elements may be exaggerated and not drawn on scale for illustrative purposes.

    [0022] Where an indefinite or definite article is used when referring to a singular noun, e.g. "a", "an", "the", this includes a plural of the noun unless something else is specifically stated.

    [0023] Furthermore, the terms first, second, third and the like in the description and in the claims are used to distinguish between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

    [0024] In figure 1 a head up display 1 according to a first exemplary embodiment of the present invention is illustrated in a perspective view. Such a head up display 1 is preferably integrated into a vehicle dashboard 10 and comprises a screen 4 for displaying visual information. In particular, the head up display 1 is arranged such that a passenger of the vehicle, in particular its driver, can take notice of the visual information without changing the head position and/or viewing direction. For example, such information is related to a current vehicle speed, fuel gauge and/or other parameters specifying the state of the vehicle and is displayed on the screen. It is also thinkable that warnings are displayed on the screen, too. Consequently, the head up display is used as a kind of prompter that supplies the passenger straightforward with information.

    [0025] It is provided that the visual information is projected onto a screen 4. A mirror, a combiner or a windscreen may be used as a screen 4, for instance. In particular, it is provided that the combiner is reversibly transferable between a usage position and a non-usage position. Preferably, the combiner being in the usage position is arranged in a field of view of the passenger and the combiner being in the non-usage position forms a part of the vehicle dashboard 10.

    [0026] In figure 2 a sectional view of the head up display 1 according to the first exemplary embodiment is illustrated. Herewith, it is provided that the head up display 1 has a projector unit 9 that generates the visual information. For generating the visual information, the projector unit 9 has a light source 2 as a backlight, such as a LED integrated in a printed circuit board, and a light modulation device for modulating the backlight such that a visual information is projected from the light modulation device to the screen 4. Preferably, the light modulation device comprises a lens 6 and/or a liquid crystal display 3, in particular a TFT (thin film transistor) display. In particular, it is provided that the liquid crystal display 3 generates the visual information that is projected onto the screen 4 by using the backlight of the light source 2. Preferably, the projector unit 9 is arranged immediately below the head up display 1. Therefore, another mirror 12 is needed for forwarding the visual information from the projector unit 9 to the screen 4 in the usage position. Preferably, another mirror 12 is integrated in a housing or part of the dashboard that accommodates also the projector unit 9. Furthermore, it is provided that the combiner is pivotally connected to the housing and/or can be moved translationally. In particular, the combiner is pivoted and/or shifted by a kinematic device 7 between the usage position and the non-usage position, wherein the kinematic device 7 preferably comprises a gearing mechanism 8.

    [0027] For adequately illuminating the screen 4 in such a head up display 1, the backlight originating from the light source 2 has to be powerful. In particular, the light source 2 has to be so powerful that an illumination of 6000 Cd/m2 is realized on the combiner. As a consequence, a heat originating from the light source affects the liquid crystal display 3, in particular the TFT display, disadvantageously. The compact arrangement of the combiner, the kinematic device 7, the light source 2, the lens 6 and liquid crystal display 3 enhances the impairment of the liquid crystal display 3 by the heat of the light source 2. An increment of the heat of the liquid crystal display 3 may damage it or prevent it from being operable properly. Therefore, it is necessary to cool the projector unit 9 at least partially for guaranteeing a proper operating of the head up display 1. For this purpose, it is provided that the projector unit 9 comprises a global radiator 5 for cooling the head up display 1 without giving up the advantageous arrangement components that form the head up display 1. In particular, it is provided that the global radiator 5 maintains the light source 2, preferably the printed circuit board with the integrated LED, the lens 6 and the liquid crystal display 3, in particular the TFT-display, and cool the liquid crystal display 3, preferably the TFT-display. In particular, the global radiator 5 has a ripped design and/or is at least partially made from a metal having a thermal conductivity greater than 100 W/(mK), preferably greater than 150 W/(mK) and more preferably greater than 200 W/(mK). Furthermore, it is provided that the global radiator 5 contacts the printed circuit board with the integrated LED, the lens 6 and the TFT-display. In particular, the lens 6 is framed by the global radiator 5. Furthermore, it is preferably provided that the printed circuit board with the integrated LED and/or the TFT-display are located at opposite regions of the global radiator 5 and determinate the ends of the global radiator. As a consequence, the global radiator 5 provides a compact projector unit 9 having components that are rigidly fixed to each other in well-defined distances by the framing global radiator 5. Furthermore, it is provided that such a TFT-display is tilted with respect to a direction being perpendicular to a main propagation direction of the backlight in order to compensate aberrations on the screen 4. The global radiator 5 is adapted to the tilted TFT-display and is designed asymmetrically.

    Reference signs



    [0028] 
    1
    head up display
    2
    light source
    3
    liquid crystal display
    4
    screen
    5
    global radiator
    6
    lens
    7
    kinematic device
    8
    gearing mechanism
    9
    projector unit
    10
    housing/dashboard
    12
    another mirror



    Claims

    1. Head up display (1) projecting visual information onto a screen (4), wherein the head up display (1) has a projector unit (9) comprising a light source (2) for illuminating a light modulating device with backlight and the light modulation device for generating the visual information, wherein the projector unit (9) has a global radiator (5) for cooling the projector unit (9), wherein the projector unit (9) is arranged immediately adjacent to a kinematic device (7) and wherein the global radiator (5) comprises at least partially a material having a thermal conductivity greater than 100 W/(mK), wherein the light modulation device comprises a lens (6) and a liquid crystal display (3), wherein the global radiator (5) contacts both the light source (2) and the light modulation device, wherein the lens (6) is arranged between the light source (2) and the liquid crystal display (3), wherein the lens (6) is arranged inside the global radiator (5), wherein the liquid crystal display (3) is a TFT-display,
    characterised in that the TFT-display is tilted with respect to a direction being perpendicular to a main propagation direction of the backlight in order to compensate aberrations on the screen (4), wherein the global radiator (5) is adapted to the tilted TFT-display and is designed asymmetrically.
     
    2. Head up display (1) according to claim 1, wherein

    -- the light source (2) is integrated into a printed circuit board.


     
    3. Head up display (1) according to any one of the preceding claims, wherein the screen (4) is a combiner and/or a mirror.
     
    4. Head up display (1) according to any one of the preceding claims, wherein the screen (4) is part of a windscreen and/or is reversibly transferable by a kinematic device (7) between a usage position and a non-usage position.
     
    5. Head up display (1) according to any one of the preceding claims, wherein the projector unit (9) is arranged below the screen (4) in the usage position.
     
    6. Head up display (1) according to any one of the preceding claims, wherein the head up display (1) has another mirror for forwarding the generated visual information from the projector unit (9) to the screen (4).
     
    7. Head up display (1) according to one of the claims 2 to 8, wherein the global radiator (5) has

    -- a ripped design and/or

    -- an additional fan.


     
    8. Head up display (1) according to any one of the preceding claims, wherein the global radiator (5) at least partially comprises aluminum.
     
    9. Head up display (1) according to any one of the preceding claims, wherein the projector unit (9) is arranged immediately adjacent to the screen (4) in its non-usage position.
     
    10. Head up display (1) according to any one of the preceding claims, wherein the head up display (1) is part of a vehicle dashboard (10).
     
    11. Head up display (1) according to any one of the preceding claims, wherein the projector unit (9) is at least partially framed by the global radiator (5), wherein the global radiator (5) extends at least partially along the periphery of the projector unit (9).
     
    12. Head up display (1) according to any one of the preceding claims, wherein the light source (2) and the liquid crystal display (3) are preferably located at opposite regions of the global radiator (5) and determinate the ends of the global radiator (5).
     
    13. Head up display (1) according to one of the preceding claims, wherein the light-source (2) is configured to provide a uniform illumination of the screen (4) of at least 6000 Cd/m2.
     
    14. Vehicle dashboard (10) having a head up display (1) according to any one of the preceding claims.
     
    15. Vehicle having a head up display (1) according to any one of the preceding claims.
     


    Ansprüche

    1. Head-up-Anzeige (1) zur Projektion von visuellen Informationen auf einen Schirm (4), wobei die Head-up-Anzeige (1) eine Projektoreinheit (9) aufweist, die eine Lichtquelle (2) umfasst, um eine lichtmodulierende Vorrichtung mit Rücklicht zu beleuchten und die Lichtmodulationsvorrichtung dazu dient, die visuellen Informationen zu erzeugen, wobei die Projektoreinheit (9) einen globalen Kühler (5) zum Kühlen der Projektoreinheit (9) aufweist, wobei die Projektoreinheit (9) unmittelbar benachbart zu einer kinematischen Vorrichtung (7) angeordnet ist und wobei der globale Kühler (5) zumindest teilweise ein Material umfasst, das eine Wärmeleitfähigkeit aufweist, die größer als 100 W/(mK) ist, wobei die Lichtmodulationsvorrichtung eine Linse (6) und eine Flüssigkristallanzeige (3) umfasst, wobei der globale Kühler (5) sowohl die Lichtquelle (2) als auch die Lichtmodulationsvorrichtung kontaktiert, wobei die Linse (6) zwischen der Lichtquelle (2) und der Flüssigkristallanzeige (3) angeordnet ist, wobei die Linse (6) innerhalb des globalen Kühlers (5) angeordnet ist, wobei die Flüssigkristallanzeige (3) eine TFT-Anzeige ist,
    dadurch gekennzeichnet, dass die TFT-Anzeige in Bezug auf eine Richtung geneigt ist, die senkrecht zu einer Hauptausbreitungsrichtung des Rücklichtes ist, um Aberrationen auf dem Schirm (4) zu kompensieren, wobei der globale Kühler (5) auf die geneigte TFT-Anzeige ausgelegt ist und asymmetrisch gestaltet ist.
     
    2. Head-up-Anzeige (1) nach Anspruch 1, wobei
    die Lichtquelle (2) in eine Leiterplatte integriert ist.
     
    3. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei der Schirm (4) ein Kombinierer und/oder ein Spiegel ist.
     
    4. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei der Schirm (4) Teil einer Windschutzscheibe ist und/oder durch eine kinematische Vorrichtung (7) umkehrbar zwischen einer Benutzungsposition und einer Nichtbenutzungsposition umwandelbar ist.
     
    5. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Projektoreinheit (9) in der Benutzungsposition unter dem Schirm (4) angeordnet ist.
     
    6. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Head-up-Anzeige (1) einen weiteren Spiegel zum Weiterleiten der erzeugten visuellen Informationen von der Projektoreinheit (9) zu dem Schirm (4) aufweist.
     
    7. Head-up-Anzeige (1) nach einem der Ansprüche 2 bis 8, wobei der globale Kühler (5)
    eine Rippengestaltung, und/oder
    ein zusätzliches Gebläse aufweist.
     
    8. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei der globale Kühler (5) zumindest teilweise Aluminium umfasst.
     
    9. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Projektoreinheit (9) in seiner Nichtbenutzungsposition unmittelbar benachbart zu dem Schirm (4) angeordnet ist.
     
    10. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Head-up-Anzeige (1) Teil eines Fahrzeugarmaturenbretts (10) ist.
     
    11. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Projektoreinheit (9) zumindest teilweise von dem globalen Kühler (5) eingerahmt ist, wobei sich der globale Kühler (5) zumindest teilweise entlang des Umfangs der Projektoreinheit (9) erstreckt.
     
    12. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei sich die Lichtquelle (2) und die Flüssigkristallanzeige (3) bevorzugt in gegenüberliegenden Regionen des globalen Kühlers (5) befinden und die Enden des globalen Kühlers (5) bestimmen.
     
    13. Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche, wobei die Lichtquelle (2) konfiguriert ist, um eine einheitliche Beleuchtung des Schirms (4) von zumindest 6000 Cd/m2 bereitzustellen.
     
    14. Fahrzeugarmaturenbrett (10), das eine Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche aufweist.
     
    15. Fahrzeug, das eine Head-up-Anzeige (1) nach einem der vorhergehenden Ansprüche aufweist.
     


    Revendications

    1. Dispositif d'affichage tête haute (1) projetant des informations visuelles sur un écran (4), dans lequel le dispositif d'affichage tête haute (1) a une unité de projection (9) comprenant une source de lumière (2) pour l'éclairage d'un dispositif de modulation de lumière avec rétroéclairage et le dispositif de modulation de lumière pour la génération des informations visuelles, dans lequel l'unité de projection (9) a un radiateur global (5) pour le refroidissement de l'unité de projection (9), dans lequel l'unité de projection (9) est agencée de manière immédiatement adjacente à un dispositif cinématique (7) et dans lequel le radiateur global (5) comprend au moins en partie un matériau ayant une conductivité thermique supérieure à 100 W/(mK), dans lequel le dispositif de modulation de lumière comprend une lentille (6) et un dispositif d'affichage à cristaux liquides (3), dans lequel le radiateur global (5) entre en contact à la fois avec la source de lumière (2) et le dispositif de modulation de lumière, dans lequel la lentille (6) est agencée entre la source de lumière (2) et le dispositif d'affichage à cristaux liquides (3), dans lequel la lentille (6) est agencée à l'intérieur du radiateur global (5), dans lequel le dispositif d'affichage à cristaux liquides (3) et un dispositif d'affichage TFT,
    caractérisé en ce que le dispositif d'affichage TFT est incliné par rapport à une direction perpendiculaire à une direction de propagation principale du rétroéclairage afin de compenser des aberrations sur l'écran (4), dans lequel le radiateur global (5) est adapté au dispositif d"affichage TFT incliné et est conçu asymétriquement.
     
    2. Dispositif d'affichage tête haute (1) selon la revendication 1, dans lequel
    la source de lumière (2) est intégrée dans une carte de circuit imprimé.
     
    3. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel l'écran (4) est un combineur et/ou un miroir.
     
    4. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel l'écran (4) fait partie d'un pare-brise et/ou est réversiblement transférable par un dispositif cinématique (7) entre une position d'utilisation et une position de non-utilisation.
     
    5. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel l'unité de projection (9) est agencée sous l'écran (4) dans la position d'utilisation.
     
    6. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel le dispositif d'affichage tête haute (1) a un autre miroir pour transmettre les informations visuelles générées de l'unité de projection (9) à l'écran (4).
     
    7. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications 2 à 8, dans lequel le radiateur global (5) a
    une conception nervurée et/ou
    un ventilateur supplémentaire.
     
    8. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel le radiateur global (5) comprend au moins en partie de l'aluminium.
     
    9. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel l'unité de projection (9) est agencée de manière immédiatement adjacente à l'écran (4) dans sa position de non-utilisation.
     
    10. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel le dispositif d'affichage tête haute (1) fait partie du tableau de bord du véhicule (10).
     
    11. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel l'unité de projection (9) est encadrée au moins en partie par le radiateur global (5), dans lequel le radiateur global (5) s'étend au moins en partie le long de la périphérie de l'unité de projection (9).
     
    12. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel la source de lumière (2) et le dispositif d'affichage à cristaux liquides (3) sont situés de préférence au niveau de régions opposées du radiateur global (5) et déterminent les extrémités du radiateur global (5).
     
    13. Dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes, dans lequel la source de lumière (2) est configurée pour fournir un éclairage uniforme de l'écran (4) d'au moins 6000 Cd/m2.
     
    14. Tableau de bord de véhicule (10) ayant un dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes.
     
    15. Véhicule ayant un dispositif d'affichage tête haute (1) selon l'une quelconque des revendications précédentes.
     




    Drawing








    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description