Head-up display system and vehicle

Abstract

The invention provides a head-up display system and a vehicle, and belongs to the technical field of vehicle optical display. The head-up display system comprises a light source assembly, a plane reflector group, a free-form surface reflector and a windshield. The light source assembly is used for emitting a reference light beam and at least one path of deflection light beam, and an included angle is formed between the orientation of the at least one path of deflection light beam and the orientation of the reference light beam; the plane reflector group is used for reflecting the at least one path of deflection light beam to the free-form surface reflector; the free-form surface reflecting mirror is located in the light emitting direction of the reference light beam, and the free-form surface reflecting mirror is used for reflecting the reference light beam and the at least one path of deflection light beam to the windshield. According to the invention, the driving information acquisition convenience of a driver can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle optical display technology, and in particular to a head-up display system and a vehicle. Background Technology

[0002] With the gradual development of intelligent driving technology, the application of HUD (Head-Up Display) systems has become increasingly widespread. HUD systems can project driving information such as vehicle speed, RPM, and fuel level onto the windshield. After reflection from the windshield, a magnified virtual image is formed in front of the driver, effectively avoiding the drawback of drivers needing to look down at traditional instrument panels to obtain driving information.

[0003] Currently, HUD systems have a relatively limited imaging position, which means that drivers can only obtain driving information within a specific field of vision, resulting in poor information accessibility. Summary of the Invention

[0004] This disclosure provides a head-up display system and a vehicle, which can solve the technical problems existing in related technologies. The technical solutions of the head-up display system and the vehicle are as follows:

[0005] In a first aspect, this disclosure provides a head-up display system, which includes a light source assembly, a planar mirror assembly, a freeform surface mirror, and a windshield;

[0006] The light source assembly is used to emit a reference beam and at least one deflection beam, wherein the orientation of the at least one deflection beam is at an angle to the orientation of the reference beam;

[0007] The plane mirror assembly is used to reflect the at least one deflection beam to the freeform surface mirror;

[0008] The freeform surface mirror is located in the light-emitting direction of the reference beam, and the freeform surface mirror is used to reflect the reference beam and the at least one deflection beam to the windshield.

[0009] In one possible implementation, the light source assembly includes a light source and a diffractor;

[0010] The light source is used to emit a beam of light;

[0011] The diffracting element is located in the light-emitting direction of the light source, and the diffracting element is used to diffract the light beam to obtain a reference beam and at least one deflection beam.

[0012] In one possible implementation, the diffracting element includes a first diffracting element, which is a tilted grating, and the first diffracting element is capable of diffracting a reference beam and a first deflection angle beam.

[0013] The planar mirror assembly includes a first planar mirror, which is used to reflect the first deflection beam to the freeform surface mirror.

[0014] In one possible implementation, the diffracting element includes a second diffracting element, which is a right-angle grating, and the second diffracting element is capable of diffracting a reference beam, a first-angle beam, and a second-angle beam.

[0015] The planar reflector group includes a first planar reflector and a second planar reflector. The second planar reflector is used to reflect the second deflection beam to the first planar reflector, and the first planar reflector is used to reflect the first deflection beam and the second deflection beam to the freeform surface reflector, respectively.

[0016] In one possible implementation, the diffracting element further includes a first diffracting element, which is a tilted grating, and the first diffracting element is capable of diffracting a reference beam and a first deflection angle beam.

[0017] The head-up display system further includes a driving component, which is connected to the first diffractor and the second diffractor respectively. The driving component is used to drive one of the first diffractor and the second diffractor to move in the light emission direction of the light source.

[0018] In one possible implementation, the optical path length of the second deflection beam is less than the focal length of the freeform mirror.

[0019] In one possible implementation, the light source assembly includes a light source and a diffractor;

[0020] The light source is used to emit the reference beam and the first beam, the reference beam and the first beam carrying different optical information;

[0021] The diffracting element is located in the light-emitting direction of the first beam. The diffracting element is a holographic grating used to diffract the first beam to obtain a first deflection angle beam.

[0022] In one possible implementation, the light source is one of a thin-film transistor projector, a digital light processing projector, a silicon-based liquid crystal projector, or a laser projector.

[0023] In one possible implementation, the freeform reflector is a concave mirror, and the concave surface of the concave mirror is arranged opposite to the light source assembly.

[0024] Secondly, this disclosure provides a vehicle that includes a head-up display system as described in the first aspect and its possible implementations.

[0025] The technical solution provided in this disclosure includes at least the following beneficial effects.

[0026] This disclosure provides a head-up display (HUD) system in which a light source assembly emits a reference beam and at least one deflection beam, both carrying driving information. The reference beam is directly incident on a freeform surface mirror and reflected by the mirror to the windshield. The deflection beam is first reflected by a plane mirror assembly to the freeform surface mirror, and then by the same mirror to the windshield. It is easy to understand that the optical path of the deflection beam is greater than that of the reference beam, meaning the object distance corresponding to the deflection beam is greater than that corresponding to the reference beam. According to the imaging formula 1 / f = 1 / u + 1 / v, the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the freeform surface mirror are different. Consequently, the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the windshield will also be different. This means that the reference beam and the deflection beam can form virtual images at different positions after reflection by the windshield. This allows the driver to obtain driving information in different visual areas, thereby improving the convenience of obtaining driving information.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a dual-focal-area head-up display system provided in an embodiment of this disclosure;

[0030] Figure 2 This is a schematic diagram of the structure of a trifocal head-up display system provided in an embodiment of this disclosure;

[0031] Figure 3 This is a schematic diagram of the structure of a switchable dual-focal / trifocal head-up display system provided in an embodiment of this disclosure;

[0032] Figure 4 This is a schematic diagram of the structure of a dual-focal-plane head-up display system that can be displayed separately and independently, according to an embodiment of this disclosure.

[0033] Legend

[0034] 1. Light source assembly;

[0035] 11. Light source; 12. Diffracting element;

[0036] 121. First diffractor; 122. Second diffractor;

[0037] 2. Plane mirror assembly;

[0038] 21. First plane mirror; 22. Second plane mirror;

[0039] 3. Freeform surface mirror;

[0040] 4. Windshield;

[0041] 5. Drive components;

[0042] 100. Eye box.

[0043] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0045] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0046] With the gradual development of intelligent driving technology, the application of HUD (Head-Up Display) systems has become increasingly widespread. HUD systems project driving information such as vehicle speed, engine speed, and fuel level onto the windshield. After reflection from the windshield, a magnified virtual image is formed in front of the driver's field of vision. The driver can directly obtain driving information from the windshield, effectively avoiding the drawback of needing to look down at a traditional instrument panel. This technology significantly improves driving safety and has become a core configuration of modern automotive human-machine interaction systems and an important manifestation of intelligent driving technology. Currently, however, HUD systems have a relatively limited imaging position, which means that drivers can only obtain driving information within a specific visual area, resulting in less convenient information access.

[0047] To address the aforementioned problems, embodiments of this disclosure provide a head-up display system, such as... Figure 1 As shown, the head-up display system includes a light source assembly 1, a plane mirror assembly 2, a freeform surface mirror 3, and a windshield 4.

[0048] The light source assembly 1 emits a reference beam and at least one deflection beam, the orientation of which is at an angle to the orientation of the reference beam. The planar mirror assembly 2 reflects the at least one deflection beam to the freeform surface mirror 3. The freeform surface mirror 3 is located in the direction of the reference beam's emission and reflects the reference beam and the at least one deflection beam to the windshield 4, respectively.

[0049] Among them, the freeform surface reflector 3 is a concave mirror, and the concave surface of the concave mirror is arranged opposite to the light source component 1.

[0050] Using the technical solution provided in this disclosure, the light source assembly can emit a reference beam and at least one deflection beam. Both the reference beam and the at least one deflection beam carry driving information. The reference beam is directly incident on the freeform surface reflector 3 and reflected by the freeform surface reflector 3 to the windshield 4. The deflection beam is reflected first by the planar reflector group 2 to the freeform surface reflector 3, and then reflected by the freeform surface reflector 3 to the windshield 4. It is easy to understand that the optical path of the deflection beam is greater than that of the reference beam, that is, the object distance corresponding to the deflection beam is greater than that corresponding to the reference beam. According to the imaging formula, 1 / f = 1 / u + 1 / v (u is the object distance, v is the image distance, and f is the focal length of the freeform surface mirror 3), the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the freeform surface mirror 3 are different. Correspondingly, the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the windshield 4 will also be different. That is, the reference beam and the deflection beam can form virtual images in different positions after reflection by the windshield 4. This allows the driver to obtain driving information in different visual areas, thereby improving the convenience of the driver in obtaining driving information.

[0051] The following is a detailed introduction to the specific structure and imaging principle of the head-up display system:

[0052] For ease of explanation, Figure 1 The area is simply divided, see [reference]. Figure 1 Windshield 4 Figure 1 Extending from the upper left to the lower right, the area at the lower left of the windshield 4 is the cockpit area, and the area at the upper right of the windshield is the driver's forward field of vision area. In addition, in the description of this disclosure, the actual small curvature of the windshield 4 is ignored, and the windshield 4 is described as a flat glass.

[0053] In some possible embodiments, the head-up display system is able to form the same virtual image at different locations in the driver's forward field of vision.

[0054] In some examples, such as Figure 1 As shown, the light source assembly 1 includes a light source 11 and a diffractor 12. The light source 11 is used to emit a light beam containing light rays with driving information. The diffractor 12 is located in the light emission direction of the light source 11 and is used to diffract the light beam emitted by the light source 11 to obtain a reference beam and at least one deflection beam.

[0055] Specifically, the diffracting element 12 can be a diffraction grating. According to the diffraction equation d*sinq=ml, where d is the period of the grating, λ is the wavelength of the incident light, θ is the diffraction angle, and m is the order of the beam. The beam emitted from the light source assembly 1, that is, the beam emitted from the light source 11, after being diffracted by the diffraction grating, will obtain multiple order beams, such as 0th order light, +1st order light, -1st order light, +2nd order light, and -2nd order light. See also... Figure 1 The diffraction angle θ of the 0th order light is 0°. The direction of the 0th order light is the same as the direction of the beam emitted by the light source 11, that is, the 0th order light is the reference beam. The directions of the +1st order light, -1st order light, +2nd order light and -2nd order light and other multi-order beams are all at an angle with the direction of the beam emitted by the light source 11, that is, these order beams are deflected beams.

[0056] In one example, the diffraction grating described above is a tilted grating.

[0057] See Figure 1 The diffracting element 12 includes a first diffracting element 121, which is a tilted grating. The first diffracting element 121 is capable of diffracting a reference beam and a first deflection angle beam.

[0058] In practice, the tilted grating concentrates the energy of the diffracted light into the 0th and +1st order beams and suppresses the energy loss of other orders. Therefore, the beam diffracted by the tilted grating is mainly concentrated in the 0th and +1st order beams, and the 0th order beam is the aforementioned reference beam. Figure 1 The beam that was not deflected after passing through diffraction element 12, the +1 order light ( Figure 1 The beam that is deflected upwards by the diffractor 12 is the first deflection angle beam mentioned above.

[0059] See also Figure 1 The plane mirror assembly 2 includes a first plane mirror 21 located in the light-emitting direction of the first deflection beam. The first plane mirror 21 is used to reflect the first deflection beam to the freeform surface mirror 3. In this example, the optical path lengths of both the reference beam and the first deflection beam are less than the focal length of the freeform surface mirror 3. In this disclosure, unless otherwise specified, the reference beam and all deflection beams are less than the focal length of the freeform surface mirror 3.

[0060] Furthermore, such as Figure 1 As shown, the reference beam is directed directly towards the freeform surface mirror 3, and the first deflection beam is reflected by the first plane mirror 21 before being directed towards the freeform surface mirror 3. It is easy to understand that the distance traveled by the first deflection beam is greater than the distance traveled by the reference beam. That is, the optical path length OMA2 of the first deflection beam is greater than the optical path length OA1 of the reference beam.

[0061] Based on the imaging principle of a concave mirror, when u < f, as the object moves further away from the concave mirror, the image distance of the virtual image on the other side of the mirror gradually approaches infinity. Therefore, A2D2 > A1D1. (See also...) Figure 1 The reference beam and the first deflection beam are reflected to the windshield 4 by the freeform surface mirror 3. Since the first deflection beam has a deflection angle, the beam after being reflected by the freeform surface mirror 3 is more deflected to one side of the cockpit area, that is, more deflected to the left. Therefore, the reflection point B2 of the first deflection beam on the windshield 4 is closer to the upper left than the reflection point B1 of the reference beam on the windshield 4. Furthermore, the optical path A2B2 of the first deflection beam between the freeform surface mirror 3 and the windshield 4 must be greater than the optical path A1B1 of the reference beam between the freeform surface mirror 3 and the windshield 4. Finally, based on the principle of plane mirror imaging, B1C1 = A1D1 + A1B1, B2C2 = A2D2 + A2B2, then the two virtual images C1 (near-distance virtual image) and C2 (far-distance virtual image) that the eye box 100 (equivalent to the driver's eye) can observe will have gaps in both the vertical and horizontal directions. That is, the driver can obtain driving information in two different visual areas, thereby improving the convenience of the driver to obtain information.

[0062] In one example, the diffraction grating described above is a right-angle grating.

[0063] See Figure 2 The diffracting element 12 includes a second diffracting element 122, which is a right-angle grating. The second diffracting element 122 is capable of diffracting a reference beam, a first-angle beam, and a second-angle beam.

[0064] In practice, a right-angle grating can concentrate the energy of the diffracted light mainly in the 0th order, +1st order, and -1st order light. Therefore, the beam diffracted by the right-angle grating is mainly concentrated in the 0th order, +1st order, and -1st order light, and the 0th order light is the aforementioned reference beam. Figure 2 The beam that was not deflected after passing through diffraction element 12, the +1 order light ( Figure 2 The beam that is deflected upwards by the diffractor 12 is the aforementioned first-angle beam, which is the -1st order light ( Figure 2 The beam that is deflected downwards after passing through the diffractor 12 is the aforementioned second deflection angle beam.

[0065] See also Figure 2 The plane mirror assembly 2 includes a first plane mirror 21 and a second plane mirror 22. The first plane mirror 21 is located in the light-emitting direction of the first angled beam, and the second plane mirror 22 is located in the light-emitting direction of the second angled beam. The second plane mirror 22 is used to reflect the second angled beam back to the first plane mirror 21, and the first plane mirror 21 is used to reflect the first angled beam and the second angled beam back to the freeform surface mirror 3, respectively. In this example, the optical path length of the reference beam, the optical path length of the first angled beam, and the optical path length of the second angled beam are all less than the focal length of the freeform surface mirror 3.

[0066] Furthermore, such as Figure 2 As shown, the reference beam is directed directly towards the freeform surface mirror 3. The first deflection beam is first reflected by the first plane mirror 21 and then directed towards the freeform surface mirror 3. The second deflection beam is first reflected by the second plane mirror 22 to the first plane mirror 21, and then reflected by the first plane mirror 21 to the freeform surface mirror 3. It is easy to understand that the distances traveled by the reference beam, the first deflection beam, and the second deflection beam increase sequentially. That is, the optical path lengths of the reference beam, the first deflection beam, and the second deflection beam increase sequentially. Correspondingly, the optical path length ONMA3 of the object distance of the second deflection beam is greater than the optical path length OMA2 of the object distance of the first deflection beam, which is greater than the optical path length OA1 of the object distance of the reference beam.

[0067] Based on the imaging principle of concave mirrors, when u < f, as the object moves further away from the concave mirror, the image distance of the virtual image on the other side of the mirror gradually approaches infinity. Therefore, A3D3 > A2D2 > A1D1. (See also...) Figure 2The reference beam, the first deflection beam, and the second deflection beam are reflected to the windshield 4 by the freeform surface reflector 3. Since the first deflection beam and the second deflection beam have deflection angles and the deflection angles gradually increase, the beam of the first deflection beam after being reflected by the freeform surface reflector 3 is more deflected to one side of the cab than the reference beam, and the beam of the second deflection beam after being reflected by the freeform surface reflector 3 is more deflected to one side of the cab than the first deflection beam, that is, it gradually deflects to the left. Therefore, the reflection point B3 of the second deflection beam on the windshield 4 is closer to the upper left than the reflection point B2 of the first deflection beam on the windshield 4, and the reflection point B2 of the first deflection beam on the windshield 4 is closer to the upper left than the reflection point B1 of the reference beam on the windshield 4. Furthermore, the optical path A3B3 of the second deflection beam between the freeform mirror 3 and the windshield 4 must be greater than the optical path A2B2 of the first deflection beam between the freeform mirror 3 and the windshield 4, and the optical path A2B2 of the first deflection beam between the freeform mirror 3 and the windshield 4 must be greater than the optical path A1B1 of the reference beam between the freeform mirror 3 and the windshield 4. Finally, based on the principle of plane mirror imaging, B1C1 = A1D1 + A1B1, B2C2 = A2D2 + A2B2, and B3C3 = A3D3 + A3B3. Therefore, the three virtual images C1 (near-distance virtual image), C2 (medium-distance virtual image), and C3 (far-distance virtual image) that the eye box 100 can observe will have gaps in both the vertical and horizontal directions. In other words, the driver can obtain driving information in three different visual areas, further improving the convenience of the driver in obtaining information.

[0068] Optionally, the head-up display system may also include a driver 5.

[0069] like Figure 3 As shown, the diffraction element 12 includes a first diffraction element 121 and a second diffraction element 122. The first diffraction element 121 is an inclined grating, and the second diffraction element 122 is a right-angle grating. The driving element 5 is disposed on the cockpit side and is connected to both the first diffraction element 121 and the second diffraction element 122. The driving element 5 is used to drive one of the first diffraction element 121 and the second diffraction element 122 to the light-emitting direction of the light source 11. Figure 3 In the example shown, the second diffractor 122 is located in the light-emitting direction of the light source 11.

[0070] Using the technical solution provided in this disclosure embodiment, and in conjunction with the example above, when the driving member 5 drives the first diffractor 121 to the light emission direction of the light source 11, the two virtual images C1 (near-distance virtual image) and C2 (far-distance virtual image) that the eye box 100 can observe will have spacing in both the vertical and horizontal directions. In the end, the driver can obtain driving information in two different visual areas. When the driving member 5 drives the second diffractor 122 to the light emission direction of the light source 11, the three virtual images C1, C2, and C3 that the eye box 100 can observe will have spacing in both the vertical and horizontal directions. That is, the driver can obtain driving information in three different visual areas.

[0071] For example, the drive element 5 can be a linear motor. Of course, the drive element 5 can also be any other reasonable drive mechanism, and this application does not limit it.

[0072] In some possible embodiments, the head-up display system is able to form different virtual images at different locations in the driver's forward field of vision.

[0073] like Figure 4 As shown, the light source assembly 1 includes a light source 11 and a diffracting element 12.

[0074] The light source 11 emits a reference beam and a first beam, which carry different optical information. For example, the light in the reference beam can carry vehicle speed information from driving information, and the light in the first beam can carry rotational speed information from driving information.

[0075] Among them, the diffraction element 12 is a holographic grating.

[0076] See Figure 4 The diffracting element 12 is located in the light-emitting direction of the first beam. The diffracting element 12 is used to diffract the first beam to obtain a first deflection angle beam. The reference beam is not blocked by the diffracting element 12 and can be directly directed towards the freeform surface mirror 3.

[0077] In practice, the diffractor 12 can concentrate the energy of the diffracted light into the +1st order light and suppress the energy loss of other orders of light. Therefore, the beam diffracted by the holographic grating is mainly concentrated in the +1st order light. Figure 1 The beam that is deflected upwards by the diffractor 12 is the first deflection angle beam mentioned above.

[0078] See also Figure 4 The plane mirror assembly 2 includes a first plane mirror 21, which is located in the light output direction of the first deflection beam and is used to reflect the first deflection beam to the freeform surface mirror 3.

[0079] Furthermore, such as Figure 4 As shown, the reference beam is directed directly towards the freeform surface mirror 3, and the first deflection beam is reflected by the first plane mirror 21 before being directed towards the freeform surface mirror 3. It is easy to understand that the distance traveled by the first deflection beam is greater than the distance traveled by the reference beam. That is, the optical path length OMA of the first deflection beam is greater than the optical path length OA of the reference beam.

[0080] Based on the imaging principle of a concave mirror, when u < f, as the object moves further away from the concave mirror, the image distance of the virtual image on the other side of the mirror gradually approaches infinity, that is, AD2 > AD1. See also... Figure 4 The reference beam and the first deflection beam are reflected to the windshield 4 by the freeform mirror 3. Due to the deflection angle of the first deflection beam, the beam reflected by the freeform mirror 3 is more deflected to one side of the driver's cab, i.e., more to the left. Therefore, the reflection point B2 of the first deflection beam on the windshield 4 is closer to the upper left than the reflection point B1 of the reference beam on the windshield 4. Furthermore, the optical path AB2 of the first deflection beam between the freeform mirror 3 and the windshield 4 is necessarily greater than the optical path AB1 of the reference beam between the freeform mirror 3 and the windshield 4. Finally, based on the principle of plane mirror imaging, B1C1 = AD1 + AB1, B2C2 = AD2 + AB2. Therefore, the two virtual images C1 and C2 observed by the eye-box 100 will have gaps in both the vertical and horizontal directions. That is, the driver can obtain driving information in two different visual areas. Moreover, since the reference beam and the first beam carry different optical information, the specific content of the two virtual images C1 and C2 will also be different.

[0081] In some possible embodiments, the light source 11 is a single image generation unit (PGU). Specifically, the light source 11 can be one of a thin-film transistor projector, a digital light processing projector, a silicon-based liquid crystal projector, or a laser projector.

[0082] The technical solutions provided in this disclosure include at least the following beneficial effects.

[0083] This disclosure provides a head-up display system in which a light source assembly emits a reference beam and at least one deflected beam. Both the reference beam and the at least one deflected beam carry driving information. The reference beam is directly incident on a freeform surface mirror 3 and reflected by the freeform surface mirror 3 to the windshield 4. The deflected beam is first reflected by a planar mirror group 2 to the freeform surface mirror 3, and then reflected by the freeform surface mirror 3 to the windshield 4. It is easy to understand that the optical path of the deflected beam is greater than that of the reference beam, that is, the object distance corresponding to the deflected beam is greater than that corresponding to the reference beam. According to the imaging formula, 1 / f = 1 / u + 1 / v, the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the freeform surface mirror 3 are different. Correspondingly, the image distances of the virtual images formed by the reference beam and the deflection beam after reflection by the windshield 4 will also be different. That is, the reference beam and the deflection beam can form virtual images in different positions after reflection by the windshield 4. This allows the driver to obtain driving information in different visual areas, thereby improving the convenience of the driver in obtaining driving information.

[0084] Furthermore, using the technical solution provided in this disclosure, in the light source assembly 1, the diffractor 12 diffracts and modulates a single beam emitted from the light source 11, so the light source 11 emits only a single beam. Compared to the optical path architecture of dual light sources 11 used in related technologies to achieve multi-focal plane imaging, the diffractor 12's ease of integration significantly reduces the size and cost of the HUD optical system. Moreover, by partitioning the diffractor 12, independent control of the beam in different regions of a single light source 11 is achieved, enabling the system to generate multiple (two or more) focal planes with different virtual image distances. Each focal plane can independently display different image content, achieving layered information presentation.

[0085] This disclosure also provides a vehicle that includes the head-up display system described above.

[0086] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A head-up display system, characterized in that, The head-up display system includes a light source assembly (1), a plane mirror assembly (2), a freeform surface mirror (3), and a windshield (4); The light source assembly (1) is used to emit a reference beam and at least one deflection beam, wherein the orientation of the at least one deflection beam is at an angle to the orientation of the reference beam; The planar mirror assembly (2) is used to reflect the at least one deflection beam to the freeform surface mirror (3); The freeform surface reflector (3) is located in the light output direction of the reference beam, and the freeform surface reflector (3) is used to reflect the reference beam and the at least one deflection beam to the windshield (4).

2. The head-up display system according to claim 1, characterized in that, The light source assembly (1) includes a light source (11) and a diffractor (12); The light source (11) is used to emit a beam of light; The diffracting element (12) is located in the light-emitting direction of the light source. The diffracting element (12) is used to diffract the light beam to obtain a reference beam and at least one deflection beam.

3. The head-up display system according to claim 2, characterized in that, The diffraction element (12) includes a first diffraction element (121), which is a tilted grating. The first diffraction element (121) can diffract a reference beam and a first deflection beam. The planar mirror assembly (2) includes a first planar mirror (21) for reflecting the first deflection beam to the freeform surface mirror (3).

4. The head-up display system according to claim 2, characterized in that, The diffraction element (12) includes a second diffraction element (122), which is a right-angle grating. The second diffraction element (122) can diffract a reference beam, a first deflection beam, and a second deflection beam. The plane mirror assembly (2) includes a first plane mirror (21) and a second plane mirror (22). The second plane mirror (22) is used to reflect the second angled beam to the first plane mirror (21), and the first plane mirror (21) is used to reflect the first angled beam and the second angled beam to the freeform surface mirror (3), respectively.

5. The head-up display system according to claim 4, characterized in that, The diffraction element (12) further includes a first diffraction element (121), which is a tilted grating and is capable of diffracting a reference beam and a first deflection angle beam. The head-up display system further includes a driving component (5), which is connected to the first diffracting element (121) and the second diffracting element (122) respectively. The driving component (5) is used to drive one of the first diffracting element (121) and the second diffracting element (122) to move to the light emission direction of the light source (11).

6. The head-up display system according to claim 4, characterized in that, The optical path length of the second deflection beam is less than the focal length of the freeform mirror (3).

7. The head-up display system according to claim 1, characterized in that, The light source assembly (1) includes a light source (11) and a diffractor (12); The light source (11) is used to emit the reference beam and the first beam, the reference beam and the first beam carrying different optical information; The diffraction element (12) is located in the light-emitting direction of the first beam. The diffraction element (12) is a holographic grating used to diffract the first beam to obtain a first deflection angle beam.

8. The head-up display system according to any one of claims 2 to 7, characterized in that, The light source (11) is one of a thin-film transistor projector, a digital light processing projector, a silicon-based liquid crystal projector, or a laser projector.

9. The head-up display system according to any one of claims 1 to 7, characterized in that, The freeform reflector (3) is a concave mirror, and the concave surface of the concave mirror is arranged opposite to the light source assembly (1).

10. A vehicle, characterized in that, The vehicle includes a head-up display system as described in any one of claims 1 to 9.

Images