Image generation device and head-up display incorporating such a device

Abstract

An image generation device (2) for a head-up display (1) is proposed, comprising a light source (6; 24) configured to generate a light beam (7), and a variable transmittance element array (8) configured to selectively receive and transmit the light beam. The device is characterized in that the image generation device includes a folding mirror (9; 23) configured to reflect the light beam emitted by the light source back to the variable transmittance element array, and in that a reflective polarizer (10; 23) is placed in a path of the light beam (7). Figure 2 is shown in the abstract.

Description

Title of the invention: Image generation device and head-up display comprising such a device. Technical field

[0001] The present invention relates to the technical field of display systems, and more specifically to the technical field of image projection systems.

[0002] The invention relates particularly to an image generation device and a head-up display comprising such a device. Technological background

[0003] A head-up display is an optical system that projects an image into the driver's field of vision, for example, to allow them to access certain driving or vehicle status information (speed, GPS directions, etc.) without having to take their eyes off the road. Typically, a head-up display includes an image generation device, which comprises, for example, a light source coupled to a matrix of elements with variable transmittance, such as a liquid crystal display (LCD), and an optical system for transmitting the images generated by the image generation device to a semi-reflective (i.e., partially reflective and partially transparent) surface, such as the vehicle's windshield or a separate semi-reflective surface dedicated to the display (known as a "combiner")..

[0004] Certain head-up displays allow the display of augmented reality images, that is, images which, from the driver's point of view, appear to be integrated into the vehicle's environment. For example, arrows can be virtually projected onto the road (that is, they appear, from the driver's point of view, to be projected onto the road) at a distance of a few meters from the vehicle. Similarly, obstacles or road signs can be virtually highlighted.

[0005] The virtual image (as perceived by the driver) displayed by an augmented reality display has several characteristics. It is inclined at least 30° to a plane orthogonal to the road or is parallel to the road. It has a luminance of approximately 5 cd / m² in night mode and a maximum luminance of at least 5000 cd / m², preferably at least 8000 cd / m². It has a contrast ratio of at least 1500:1 and a width of at least 1 meter. Its brightness must be uniform.

[0006] Therefore, a head-up display suitable for providing a virtual image in augmented reality must include a light source capable of providing very high optical power, which generates very high heat that is potentially harmful to the components of the head-up display, and include an optical system that has a magnification factor of at least 5, preferably of at least 10. Such an optical system, when subjected to solar radiation (which arrives in the opposite direction to the light beam generated by the display), risks strongly concentrating the sun's rays at a point in the variable transmittance element matrix, which can damage the variable transmittance element matrix.

[0007] There is therefore a need to find a way to respect the optical and light constraints specific to the display of images in augmented reality while preserving the integrity of the head-up display. Summary of the invention

[0008] The present invention addresses this need by providing an imaging device with improved energy efficiency.

[0009] According to one aspect, an image generation device for a head-up display is proposed, comprising a light source configured to generate a light beam, and a variable transmittance element array configured to selectively receive and transmit the light beam. The image generation device includes a folding mirror configured to reflect the light beam emitted by the light source towards the variable transmittance element array, and a reflective polarizer is placed in a path of the light beam between the light source and the variable transmittance element array.

[0010] A folding mirror advantageously allows the optical path traveled by the light beam to be folded, thus providing a longer optical path for the same device dimensions. This allows the light source to be placed at a greater distance from the variable transmittance element array, advantageously limiting the latter's heating. Furthermore, the reflective polarizer ensures selective transmission of the rays to the variable transmittance element array, preventing rays with unsuitable polarization from being absorbed by the array, which would contribute to its heating. The energy efficiency of the device is thereby improved.

[0011] According to one embodiment, the light source is configured to transmit the light beam to reflective polarizer through an optical reflector having an inner wall which is covered with a metallic coating and which is configured to collimate rays of the light beam.

[0012] According to one embodiment, the image generation device comprises a plurality of light sources, each light source being configured to transmit a light beam to the reflective polarizer through a separate optical reflector.

[0013] According to one embodiment, the reflective polarizer is located on the path of the light beam between the light source and the folding mirror, and preferably between the optical reflector and the folding mirror.

[0014] Thus, the rays reflected by the polarizer can be sent back to the optical reflector and undergo one or more further reflections on the walls of the reflector and / or on the reflective polarizer until they reach the reflective polarizer with the appropriate polarization. In this way, more light rays will be transmitted by the polarizer. The optical efficiency of the device is thereby improved, as is its thermal efficiency, since the rays, being either reflected or transmitted, are not absorbed by the device.

[0015] According to one embodiment, the folding mirror is formed by the reflective polarizer.

[0016] This reduces the number of elements in the device, since a single element performs the functions of both folding mirror and polarizer. Furthermore, a reflective polarizer acting as a folding mirror allows for better control of the polarization of the reflected rays. In addition, only rays with the appropriate polarization are reflected back to the variable transmittance element array, thus limiting its heating.

[0017] According to one embodiment, an optical diffuser is placed in the path of the light beam between the reflective polarizer and the variable transmittance element array.

[0018] According to one embodiment, the optical diffuser and the variable transmittance element array are placed on an optical axis of the image generation device such that each forms a different angle with the optical axis in the same plane containing the optical axis. In other words, according to this embodiment, the optical diffuser and the variable transmittance element array are not parallel.

[0019] According to one embodiment, a collimating lens is placed in the path of the light beam, between the light source and the reflective polarizer.

[0020] According to one embodiment, the image generation device comprises a housing made of an opaque material (i.e., one that impedes the passage of light. An opaque material can therefore absorb or reflect light, but not be permeated by it) defining a conduit delimiting the contours of the beam path luminous, at least part of the inner surface of the casing having a reflection coefficient greater than 0.6.

[0021] According to one embodiment, a glass plate at least partially transparent is placed in contact with a downstream face of the matrix of elements with variable transmittance relative to the direction of propagation of the light beam.

[0022] According to another aspect, a head-up display for a motor vehicle is proposed, comprising an image generation device according to the invention and an optical system configured to reflect the light beam from the image generation device into a field of vision of a driver of the motor vehicle.

[0023] Of course, the various features, variants, and embodiments of the invention can be combined with one another in various ways, provided they are not incompatible or mutually exclusive. Brief description of the figures

[0024] In addition, various other features of the invention become apparent from the attached description made with reference to the drawings which illustrate non-limiting embodiments of the invention and where:

[0025] [Fig. 1] is a schematic representation of a head-up display according to the invention;

[0026] [Fig.2] is a schematic representation of an image generation device according to one embodiment of the invention,

[0027] [Fig.3] is a schematic representation of an image generation device according to another embodiment of the invention, and

[0028] [Fig.4] is a schematic representation of an image generation device according to another embodiment of the invention.

[0029] It should be noted that in these figures the structural and / or functional elements common to the different variants may have the same references.

[0030] A head-up display according to an embodiment of the invention, as schematically represented in [Fig. 1] and designated as a whole by the reference numeral 1, is configured to generate and display an augmented reality image I in the field of vision of a driver CD of a motor vehicle, for example a car. To this end, the head-up display 1 comprises an image generation device 2 configured to generate a downstream light beam (or flux) 3 (relative to the direction of propagation of the light beam and with respect to an upstream light beam which will be defined below) corresponding to the image to be displayed, a partially transparent blade 4, for example the windshield of the vehicle, and an optical system 5, here comprising two folding mirrors 27, configured to reflect the downstream light beam 3 towards the partially transparent blade 4.

[0031] The image generation device 2, illustrated in more detail in [Fig.2], comprises a light source 6 configured to generate an upstream light beam 7 (relative to the direction of propagation of the beam), a variable transmittance element matrix 8 configured to receive the upstream light beam 7 and to transmit it selectively, so as to form the downstream light beam 3, as well as a folding mirror 9 and a reflective polarizer 10 placed in the path of the upstream light beam 7, between the light source 6 and the variable transmittance element matrix 8.

[0032] The light source 6 comprises, for example, at least one light-emitting diode and preferably a plurality of light-emitting diodes, in particular arranged in a matrix on a printed circuit board IL

[0033] The variable transmittance element matrix 8 is here controlled so that, depending on the image to be displayed, one or more of its elements are opaque (zero transmittance), one or more of its other elements have maximum transmittance (relative to the capacity of the matrix), and one or more of its other elements have transmittances of intermediate values.

[0034] For example, the variable transmittance element matrix 8 here comprises a first polarizing film applied to its upstream face and a second polarizing film applied to its downstream face (not shown in the figures). The first and second polarizing films are arranged in a crossed configuration (each allows two distinct polarization directions to pass through). Each element of the variable transmittance element matrix 8 can be controlled to modify the polarization of the light delivered by the first polarizing film.Thus, depending on the command applied to it, either the element does not modify the polarization of the light passing through it (the two polarizing films being crossed, the light is blocked by the second polarizing film and the transmittance of the element is zero), or it partially modifies the polarization (the transmittance is then of intermediate value), or it modifies the polarization so as to correspond to that of the second polarizing film (the transmittance is then maximum).

[0035] The path of the upstream light beam 7, from the light source 6 to the The variable transmittance element matrix 8 is centered around two optical axes (an optical axis is understood here as the average path of the rays of the upstream light beam 7). It is centered around a first optical axis Ax between the light source 6 and the folding mirror 9 and, after reflection on the folding mirror, around a second optical axis Ay between the folding mirror 9 and the variable transmittance element matrix 8.

[0036] The variable transmittance element matrix 8 extends within a plane. The first optical axis Ax of the image generation device 2 forms an angle not straight and not zero with the plane in which the variable transmittance element matrix 8 extends. The first optical axis Ax is thus neither orthogonal nor coplanar with the plane containing the variable transmittance element matrix 8.

[0037] For example, the variable transmittance element matrix 8 forms, in section in a plane containing the first optical axis Ax (here the plane of [Fig.2]), an angle between 15° and 45°, preferably between 25° and 35°, even more preferably an angle of 30° with the first optical axis Ax.

[0038] Similarly, the second optical axis Ay of the image generation device 2 forms a non-right and non-zero angle with the plane in which the variable transmittance element matrix 8 extends. The second optical axis Ay is thus neither orthogonal nor coplanar with the plane containing the variable transmittance element matrix 8.

[0039] For example, the variable transmittance element matrix 8 is a liquid crystal display (LCD, for "Liquid Crystal Display" according to the usual Anglo-Saxon acronym).

[0040] In this example, the image generation device 2 comprises a protective housing 12 made of an opaque material defining a conduit through which the upstream light beam 7 flows and which is globally centered around the first optical axis Ax and the second optical axis Ay. At a first end of the protective housing 12 (at the bottom of the housing, i.e. here at the level of the most upstream part of the housing, relative to the direction of propagation of the light beam) is the light source 6. A second end of the protective housing 12 opposite to the first end (i.e. at the level of the most downstream part of the protective housing 12, relative to the direction of propagation of the upstream light beam) has an opening at the level of which is the variable transmittance element array 8, which is arranged so as to close the opening.The variable transmittance element matrix 8 forms the only optical output (the only non-opaque portion) of the protective housing 12.

[0041] In this example, the protective housing 12 comprises three distinct portions fixed to one another. A first portion 20, or lower portion, here comprises an optical reflector 14. A second portion 21, or intermediate portion, has a first end adapted to be fixed to the first portion 20. A third portion 22, or upper portion, has a first end adapted to be fixed to a second end of the second portion 21, and a second end configured to receive the variable transmittance element array 8. The portions of the protective housing 12 are, for example, fixed to one another, here by a snap-fit ​​system.

[0042] For example, the three portions 20, 21, 22 are made of the same material, for example a polymer material, for example polycarbonate or polybutylene terephthalate, reinforced or not by glass fibers.

[0043] The image generation device 2 includes a folding mirror 9 placed on the optical path of the upstream light beam 7 so as to reflect it towards the variable transmittance element array 8. For example, here, the folding mirror 9 is a plane mirror inclined at 45° with respect to the first optical axis Ax. The first optical axis Ax and the second optical axis Ay thus form an angle with each other, for example a right angle (as illustrated in [Fig. 2]).

[0044] The folding mirror 9 includes, for example, a reflective film applied to an internal wall of the protective housing 12, here an internal wall of the second portion 21, or a rigid mirror itself forming a wall of the protective housing 12.

[0045] The image generation device 2 here comprises the optical reflector 14 configured to collimate at least a portion of the rays from the upstream light beam 7. In this example, the optical reflector 14 is partly formed by the first portion 20 of the protective housing 12. The optical reflector 14 is positioned relative to the light source 6 such that all rays emitted by the light source 6 at an angle of 90° or less with respect to the first optical axis Ax enter the optical reflector 14. For example, here, the optical reflector 14 forms a conduit that flares downstream (relative to the direction of propagation of the upstream light beam) and has a narrow first end and a wider second end. The optical reflector 14 is positioned so that the narrow end is at the same level as the light source 6. For example, the narrow end is in contact with the printed circuit board 11.

[0046] The curvature of the inner walls of the optical reflector 14 (i.e., here, the inner walls of the first portion 20 of the protective housing 12) is chosen so that all rays emitted by the light source 6 that strike the inner wall of the optical reflector 14 at a given angle with respect to the first optical axis Ax are reflected in such a way as to reduce said given angle. For example, they are reflected so as to present a zero or almost zero angle (for example, less than 10°) with respect to the first optical axis Ax.

[0047] Here, the inner wall of the optical reflector 14 has a reflectivity greater than or equal to 65%, preferably greater than or equal to 85%. It is, for example, made of metal, such as aluminum, silver, or an alloy containing at least one of these metals, which gives it this reflectivity. For example, the inner wall of the first portion is covered with a metallic coating 26.

[0048] Preferably, the thickness of this metallic coating 26 is greater than 100 nanometers, so that the coating is not damaged during any eventual The expansion of the optical reflector 14 under the effect of heat is less than 500 nanometers to ensure a sufficiently homogeneous surface. A passivation layer is applied to the metallic coating 26 to prevent moisture-related corrosion. For example, this passivation layer effectively protects the metallic coating 26 in an environment where the relative humidity (i.e., the amount of water in the ambient air relative to the saturation level) reaches 65%.

[0049] In order to limit the thermal expansion of the optical reflector 14, the material on which the metallic coating is applied has a low coefficient of thermal expansion, i.e. here a coefficient of thermal expansion less than or equal to 5.10 5 K *. For example, this material is a polymer, in particular high-temperature polycarbonate (HTPC).

[0050] Here, a collimating lens 15 is placed downstream of the light source 6, such that the light source 6 is located at least partially at a principal focus of the collimating lens 15. The collimating lens 15 is a converging lens configured such that the rays emitted by the light source 6 at the principal focus of the collimating lens 15 emerge from the collimating lens 15 parallel to the first optical axis Ax. The other rays, which are emitted by the light source 6 at a distance from the principal focus of the lens, emerge from the lens at an angle to the first optical axis Ax that is reduced compared to their angle of emission.

[0051] The reflective polarizer 10 is positioned at the second end (the wider end, furthest from the light source 6) of the optical reflector 14, and is configured to transmit all incoming rays with a polarization corresponding to that of the first polarizing film (upstream polarizing film) of the variable transmittance element array 8, and to reflect all incoming rays with a different polarization. These latter rays will eventually be reflected off the internal walls of the optical reflector 14 and the reflective polarizer 10 until they reach the optical reflector 14 with the correct polarization (that accepted by the first polarizing film).Thus, rays with a polarization unsuitable for the first polarizing film will not be transmitted to the variable transmittance element array 8, thereby preventing them from being absorbed by the variable transmittance element array and contributing to its temperature rise. For example, the reflective polarizer 10 is housed in a compartment located at the first end of the second portion 21 of the protective housing 12. It is, for example, fixed to the second portion 21 or held by clamping between the first portion 20 and the second portion 21.

[0052] The reflective polarizer 10 comprises, for example, a polarizing film associated with a rigid, transparent plate that provides its rigidity. For example, the polarizing film is integrated into the rigid plate, or is applied to one of the faces of the rigid plate, preferably the upstream face (relative to the direction of propagation of the light beam). The rigid plate is, for example, made of glass or plastic. The reflective polarizer 10 is configured here to operate in a temperature range of at least 105°C. The reflective polarizer 10 has a thickness of less than 0.15 millimeters, for example 0.075 millimeters, notably due to the lamination operations inherent in its manufacture. An example of such a polarizer is, at the date of filing of this application, marketed by 3M® under the name "3M™ Visible-Light Reflective Polarizer (VRP)".

[0053] An optical diffuser 16 is configured here to receive the upstream light beam 7 and to transmit it uniformly to the variable transmittance element array 8 (i.e., so that the luminance of the upstream light beam reaching the variable transmittance element array 8 is homogeneous over the entire surface of the array). Here, the optical diffuser 16 is in the form of a plate placed in the path of the light beam, downstream of the folding mirror 9 and opposite and upstream of the variable transmittance element array 8. The optical diffuser 16 is located at a non-zero distance from the variable transmittance element array. The greater the space between the optical diffuser 16 and the variable transmittance element array 8, the lower the convective heat transfer between these two elements.

[0054] Here, the optical diffuser 16 is located orthogonally on the second optical axis Ay (in section in a plane containing the second optical axis Ay, here the plane of [Fig. 2]). Thus, the optical diffuser 16 and the variable transmittance element array 8 each form a different angle with the second optical axis Ay. In other words, the optical diffuser 16 and the variable transmittance element array 8 are not parallel.

[0055] The optical diffuser 16 is for example housed in a housing located at the second end of the second portion 21 of the protective housing, and is fixed to the second portion 21 or held by clamping between the second portion 21 and the third portion 22.

[0056] A transparent heat dissipation plate 17 is applied here to one of the faces of the variable transmittance element matrix 8, here the downstream face. It is configured on the one hand to absorb and dissipate the heat accumulated in the variable transmittance element matrix, for example the heat generated by the upstream light beam 7, and on the other hand to absorb and dissipate the heat generated by the solar flux that would arrive on the downstream face of the matrix 8.

[0057] The heat dissipation plate 17 has an optical transmission rate greater than 95%, preferably greater than 98%. It has a thickness greater than or equal to 1 millimeter, for example here greater than or equal to 2 millimeters. In this example, it also includes a hot mirror (not shown in the figures) applied to its downstream face and configured to reflect infrared radiation, in particular that from the solar flux.

[0058] In this embodiment, the heat dissipation plate 17 and the variable transmittance element array 8 are held against each other and against the protective housing 12 by a retaining frame 18. Here, the retaining frame 18 is in contact with the heat dissipation plate 17 and is fixed to the protective housing 12, for example, by a snap-fit ​​system. The retaining frame 18 is made of a thermally conductive material, in particular a metal and especially aluminum, and forms a thermal bridge configured to dissipate heat from the heat dissipation plate 17 to the outside (via the ambient air) and to the protective housing 12.

[0059] The image generation device 2 further includes a cooling system 19 for the light source 6. Here, the cooling system 19 is placed in contact with the printed circuit board 11, on a face opposite to the face housing the light source 6. The cooling system includes, for example, one or more passive heat sinks, for example, a metal heat sink with fins that increase its surface area in contact with the air. It may or may not be coupled to one or more active cooling systems, for example, a fan or a heat transfer fluid system.

[0060] According to an alternative embodiment illustrated in [Fig. 3], the image generation device 2 comprises a reflective polarizer 23 which, in addition to its polarization function, also serves as a folding mirror, a function which, in the previous embodiment, was performed by the folding mirror 9. Here, the reflective polarizer 23 is configured to reflect back to the variable transmittance element array 8 all the rays that reach it with a polarization corresponding to that of the first (upstream) polarizing film of the variable transmittance element array 8, and to transmit (allow to pass through) the other rays. Thus, rays with a polarization unsuitable for the first polarizing film will not be transmitted to the variable transmittance element array, thereby preventing them from being absorbed by the variable transmittance element array and contributing to its temperature rise.

[0061] For example here, the reflective polarizer 23 is a polarizing film applied to a wall of the protective housing 12. Thus, the rays which it transmits are absorbed by the protective housing 12.

[0062] In this example, a portion of the internal surface of the protective housing 12 has a reflectance greater than 0.7. For example, here, the entire internal surface of the second portion 21 of the protective housing 12, with the exception of the area covered by the reflective polarizer 23, is coated with a reflective material. Preferably, the reflective material has a reflectance greater than 70%. For example, the reflective material is white or, as illustrated in [Fig. 3], the reflective material is the same as the metallic coating 26 applied to the internal wall of the reflector 14.

[0063] The invention is not limited to the embodiments described above with reference to Figures 1 to 3. For example, an image generation device comprising a single light source and a single optical reflector has been described. As illustrated in [Fig. 4], the invention is compatible with several light sources 24, each associated with a separate optical reflector 25. Each of these reflectors functions analogously to the reflector described above with reference to [Fig. 2].

[0064] Alternatively, the image generation device 2 may comprise several light sources associated with the same optical reflector. In this case, each of these light sources associated with the same optical reflector is associated with a separate collimating lens, or at least some of these light sources are associated with the same collimating lens.

[0065] The image generation devices described above include a folding mirror, or a reflective polarizer acting as a folding mirror, which are configured to reflect the light emitted by the source at an angle, for example, of 90°. The invention is not limited to an angle of 90° but is compatible with any angle value, and preferably with angle values ​​greater than or equal to 90°, for example greater than or equal to 100°, greater than or equal to 120° or greater than or equal to 135°.

[0066] Although a three-part housing is particularly advantageous for assembling the device and, in particular, for installing the various optical elements described above, the invention is not limited to a housing comprising three parts, but is compatible with a different number of parts, in particular a number of parts adapted to the number and configuration of the optical elements, or with a housing made of a single part. For example, the protective housing 12 of the embodiment illustrated in [Fig. 4] comprises a single part.

[0067] The optical diffuser described above advantageously allows for homogeneous illumination of the variable transmittance element array. However, the invention is not limited to the presence of an optical diffuser, and embodiments cover image generation devices without an optical diffuser. The same applies to the heat dissipation plate, which can be absent in some embodiments, or placed on the upstream face of the matrix. Some embodiments include a heat dissipation plate on each face of the matrix. Similarly, the collimation lens is advantageous but optional within the scope of the invention.

[0068] The embodiments described above include a liquid crystal display. However, the invention is not limited to this technology and is compatible with any variable transmittance element array technology.

[0069] A protective housing made of polymer material has been described previously. However, the invention is compatible with any material, preferably opaque. Furthermore, when the protective housing comprises several portions, these may be made of the same material or of different materials. Some embodiments include at least one portion of the protective housing made of a thermally conductive material, in particular metal, and preferably aluminum. Moreover, the outer wall of the housing may be covered, at least partially, by the metallic coating mentioned above, in order to improve the heat dissipation of the device.

[0070] Various other modifications may be made to the invention within the scope of the annexed claims.

Claims

Demands

1. Image generation device (2) for head-up display (1) comprising a light source (6; 24) configured to generate a light beam (7), a variable transmittance element array (8) configured to selectively receive and transmit the light beam (7), characterized in that the image generation device (2) comprises a folding mirror (9; 23) configured to reflect the light beam emitted by the light source towards the variable transmittance element array, and in that a reflective polarizer (10; 23) is placed on a path of the light beam (7) between the light source (6) and the variable transmittance element array (8).

2. Device according to claim 1, wherein the light source (6) is configured to transmit the light beam (7) to the reflective polarizer (10; 23) through an optical reflector (14) having an inner wall which is covered with a metallic coating (26) and which is configured to collimate rays from the light beam (7).

3. Device according to claim 1 or 2, comprising a plurality of light sources (24), each light source being configured to transmit a light beam to the reflective polarizer through a separate optical reflector (25).

4. Device according to any one of claims 1 to 3, wherein the reflective polarizer (10) is located on the path of the light beam between the light source (6) and the folding mirror (9).

5. Device according to any one of claims 1 to 3, wherein the folding mirror is formed by the reflective polarizer (23).

6. Device according to any one of claims 1 to 5, wherein an optical diffuser (16) is placed in the path of the light beam (7) between the reflective polarizer (10) and the variable transmittance element array (8).

7. Device according to claim 6, wherein the optical diffuser (16) and the variable transmittance element array (8) are placed on an optical axis (Ay) of the image generation device (2) so as to each form, in the same plane containing the optical axis (Ay), a different angle with the optical axis (Ay).

8. Device according to any one of claims 1 to 7, wherein a collimating lens (15) is placed on the optical path of the light beam (7), between the light source (6) and the reflective polarizer (10; 23).

9. Device according to any one of claims 1 to 8, comprising a housing (12) made of an opaque material defining a conduit delimiting the contours of the path of the light beam (7), at least a part of the inner surface of the housing having a reflection coefficient greater than 0.

6.

10. Device according to any one of claims 1 to 9, wherein a glass plate (17) at least partially transparent is placed in contact with a downstream face of the variable transmittance element matrix (8) relative to the direction of propagation of the light beam (7).

11. Head-up display for motor vehicle comprising an image generation device according to any one of claims 1 to 10 and an optical system (5) configured to reflect a downstream light beam (3) from the image generation device (2) into a driver's (CD) field of vision of the motor vehicle.

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