Head-up Display

Abstract

The head-up display comprises an electro-optical display (102) and a first mirror (108, 110, 120), wherein an image (106) can be generated by means of the electro-optical display (102), which can be reflected via the first mirror (108, 110, 120) against a combiner (101), thus enabling a beam path (S) from the electro-optical display (102) to the combiner (101), and thus allowing an observer of the head-up display to perceive both the image (106) generated by the electro-optical display as a virtual image (107) and the environment behind the combiner (101) when looking at the combiner (101), and the first mirror (108, 110, 120) is designed to be rotatable about a rotation axis (109, 111, 123) to change the position of the virtual image. is, wherein the axis of rotation (109, 111, 123) is arranged outside the optical center (122) of the first mirror (108, 110, 120), characterized in that the axis of rotation (109, 111,123) is shifted from the optical center (122) of the first mirror (108, 110, 120) in front of an active surface (121) of the first mirror (108, 110, 120).

Description

[0001] The invention relates to a head-up display. Head-up displays are known in the art that comprise an electro-optical display, a first mirror, and a combiner. An image can be generated by means of the electro-optical display, which can be reflected back to the combiner via the at least first mirror. In this way, a beam path from the image-generating device to the combiner is realized, allowing an observer of the head-up display to perceive both the image generated by the display as a virtual image and the environment behind the combiner when looking at the combiner. The virtual image is superimposed on the real world. Although the virtual image appears to the observer to be floating behind the combiner, the observer is actually looking at the electro-optical display, with the combiner also acting as a mirror.Therefore, there is only a small area, the so-called eyebox, within which an observer's eyes must be positioned to perceive the virtual image. For this reason, the first mirror is designed to be rotatable around an axis of rotation to change the position of the virtual image. In the prior art, this axis of rotation lies within the optical center (central ray) of the first mirror. This design requires a large installation space, which is rarely available in typical vehicle dashboards, as these also contain other displays, wiring, and air conditioning ducts, for example.

[0002] DE 10 2014 008 201 A1 discloses a display device for a motor vehicle, which has a display surface for showing an image and an optical device designed to project an image displayed on the display surface as a virtual image onto a reflective surface. The optical device has at least one reflector and one actuator designed to move the reflector. DE 10 2014 013 967 A1 describes a head-up display for a motor vehicle. WO 2006 / 072 529 A1 relates to a head-up display with an image generation unit and at least one mirror arranged in the beam path downstream of the image generation unit. DE 38 22 222 A1 relates to head-up displays and the avoidance of double images and disturbing reflections on a windshield by arrangements of linear polarizing filters and louvered films.DE 10 2013 218 085 A1 relates to a head-up display for use in a motor vehicle with an image generation device that generates a real image and wherein the light rays of the real image reach a combiner and thus form a beam path and are reflected from there towards an observer, so that the observer can perceive a virtual image behind the combiner outside the motor vehicle.

[0003] The object of the invention is to provide a head-up display which requires a smaller installation space compared to solutions known in the prior art.

[0004] This is achieved by positioning the axis of rotation outside the optical center of the first mirror. This allows the individual components in the beam path of the head-up display to be arranged closer together, thus reducing the required installation space of the head-up display.

[0005] It is particularly preferred to shift the axis of rotation from the optical center of the first mirror towards an edge of the first screen, especially to the edge of the first mirror. According to the invention, space can be saved by shifting the axis of rotation from the optical center of the first mirror in front of an active surface of the first mirror. Optimal space savings can be achieved by combining the aforementioned shifts.

[0006] If the combiner is designed as a motor vehicle windshield, no additional component is required for the combiner, and therefore no additional installation space is needed. Furthermore, the position of the virtual image can be optimally adjusted.

[0007] If the combiner is designed as a separate component, the first mirror can be simpler, since the combiner can then have a flat surface and thus the first mirror does not have to compensate for any distortions. If this separate combiner is pivotable, it can be swivelled when not in use, for example, to cover the other components of the head-up display.

[0008] If the first mirror is aspherical, distortions caused by a curved windshield can be compensated for in such a way that the virtual image appears undistorted.

[0009] If another mirror is placed in the beam path between the electro-optical display and the combiner, a correspondingly longer beam path can be achieved, so that the virtual image lies further away behind the combiner.

[0010] If the image displayed on the electro-optical display can be distorted, distortions that cannot be corrected by the first mirror can be corrected so that the virtual image appears undistorted again.

[0011] The invention is explained in more detail below with reference to the figures. They show: Fig. 1 An embodiment of a head-up display according to the state of the art Fig. 2 a first embodiment of the head-up display according to the invention Fig. 3 a second embodiment of the head-up display according to the invention Fig. 4 an embodiment of a first mirror according to the invention

[0012] In Fig. Figure 1 shows a partial representation of a motor vehicle 100 with a windshield 101, an electro-optical display 102, a second mirror 103, a first mirror 104 with a rotation axis 105, an image display 106, a virtual image 107, a beam path S, and the eye E of an observer of the head-up display who is otherwise not shown. The image display 106 generated by the electro-optical display 102 is reflected via the second mirror 103 to the first mirror 104. The first mirror 104 reflects the light rays back towards the windshield 101, which, also acting as a combiner, reflects the light rays incident from the first mirror 104 into the eye E of an observer, so that the observer has the impression of perceiving the virtual image 107 at the displayed position.Since the observer's eye E actually looks at the electro-optical display 102, the beam path must be rotated by turning the first mirror 104 about its axis of rotation, depending on the position of the observer's eye E, so that the beam path S can also reach eye E. In the prior art, this axis of rotation 105 is arranged as shown at the optical center of the first mirror 104.

[0013] In Fig. 2 can also be recognized as in Fig. 1 again the motor vehicle 100 with the windshield 101, an electro-optical display 102, the second mirror 103, the virtual image 107, the beam path S and the eye E of an observer. A first mirror 108 is rotatable about a rotation axis 109, the rotation axis 109 being located at the edge of the first mirror 108 and in front of its active surface. This allows the required installation space to be reduced. The image 106 of the electro-optical display 102 is reflected via the second mirror 103 back towards the first mirror 108 and from there reflected via the windshield 101 into the eye E of the observer, so that he can perceive the virtual image 107 at the displayed position.

[0014] In Fig. Figure 3 again shows the motor vehicle 100 with the windshield 101, the electro-optical display 102, the image display 106, the beam path S, the virtual image 107, and the eye E of an observer. A first mirror 110 is also shown, which is rotatable about an axis of rotation 111. The axis of rotation 111 is located in front of the optically active surface of the first mirror 110, outside the optical center of the first mirror 110 (which is not shown).

[0015] The image 106 of the electro-optical display 102 is reflected by the first mirror 110 against the windshield 101 and from there into the eye E of an observer. In this way, an observer can perceive the virtual image 107 at the displayed position with their eye E. In this embodiment, a second mirror has been omitted. This further reduces the required installation space.

[0016] In Fig. Figure 4 shows a first mirror 120 with an optically active surface (mirror surface) 121, an optical center 122 of the first mirror 120, and a rotation axis 123 of the first mirror 120. A central ray MS, reflected from the optical center 122, is also shown. The rotation axis 123 of the first mirror 120 is located in front of and at the edge of the optically active surface 121 of the first mirror 120, as shown. Despite the displacement of the rotation axis 123 from the optical center 122, significant degradation of the virtual image is avoided. Minor inaccuracies can be compensated for, if necessary, by a pre-distortion of the image representation 106 (in Fig. 2 and Fig. 3) be balanced.

Claims

[1] Head-up display comprising an electro-optical display (102) and a first mirror (108, 110, 120), wherein an image representation (106) can be generated by means of the electro-optical display (102), which can be reflected via the first mirror (108, 110, 120) against a combiner (101), and thus a beam path (S) from the electro-optical display (102) to the combiner (101) can be realized, and thus for an observer of the head-up display, when looking at the combiner (101), both the image representation (106) generated by means of the electro-optical display as a virtual image (107) and the environment present behind the combiner (101) can be perceived, and the first mirror (108, 110, 120) can be rotated about a rotation axis (109, 111, 123) to change the position of the virtual image. is designed in such a way that the axis of rotation (109, 111, 123) is arranged outside the optical center (122) of the first mirror (108, 110, 120), characterized by, that the axis of rotation (109, 111, 123) is shifted from the optical center (122) of the first mirror (108, 110, 120) in front of an active surface (121) of the first mirror (108, 110,120). [2] Head-up display according to claim 1, characterized by , that the axis of rotation (109, 111, 123) is shifted from the optical center (122) of the first mirror (108, 110, 120) towards an edge of the first mirror (108, 110, 120). [3] Head-up display according to claim 2, characterized by , that the axis of rotation (109, 111, 123) is shifted from the optical center (122) of the first mirror (108, 110, 120) to the edge of the first mirror. [4] Head-up display according to one of the preceding claims, characterized by , that the combiner is designed as a windshield (101) of a motor vehicle (100). [5] Head-up display according to any one of the preceding claims 1 to 3, characterized bythat the combiner is designed as a separate component of a motor vehicle. [6] Head-up display according to claim 5 above, characterized by that the combiner is arranged to pivot [7] Head-up display according to one of the preceding claims, characterized by , that the first mirror (108, 110, 120) is designed aspherically. [8] Head-up display according to one of the preceding claims, characterized by , that a further mirror (103) is arranged in the beam path between the electro-optical display (102) and the combiner (101). [9] Head-up display according to one of the preceding claims, characterized by , that the image display (106) on the electro-optical display (102) can be produced in a distorted manner. [10] Head-up display according to claim 9, characterized by, that the image display (106) on the electro-optical display (102) can be distorted in such a way that the image display in the form of the virtual image (107) appears undistorted to the observer.

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