Multi-focal-plane head-up display system

Abstract

The utility model relates to a multi-focal-plane head-up display system, comprising an image source module which comprises a first display unit used for emitting first image light, a second display unit used for emitting second image light, and a third display unit used for emitting third image light; the first reflecting part is arranged on the light emitting side of the image source module; the second reflecting part is arranged on the light emitting side of the first reflecting part; the imaging part is arranged on the light emitting side of the second reflecting part; distance differences exist between the first display unit, the second display unit and the third display unit and the first reflecting part, optical distances from the first image light, the second image light and the third image light to the imaging part are different, and the projection distance of the first virtual image surface is larger than that of the third virtual image surface. The second virtual image plane is obliquely located between the first virtual image plane and the third virtual image plane, and the two ends of the second virtual image plane are connected with the first virtual image plane and the third virtual image plane respectively. According to the utility model, the driving comfort and safety can be improved.

Description

Technical Field

[0001] This utility model relates to the field of head-up display technology, and more specifically, to a multi-focal head-up display system. Background Technology

[0002] All head-up displays (HUDs) on the market, whether WHUD (Windshield HUD) or AR-HUD (Augmented Reality HUD), have a fixed imaging distance for the displayed image. However, during driving, the driver's field of vision includes the main unit screen, dashboard information, HUD information, road information, road sign information, etc. The real-world distance of each piece of information is not continuous. The image information of existing head-up displays cannot cover the distance in front of the driver's field of vision, resulting in the virtual image not being able to fully blend with the real-world information. Therefore, the driver's vision needs to switch back and forth between the real-world and virtual images, which distracts the driver's attention and affects safety. Utility Model Content

[0003] The purpose of this invention is to provide a multi-focal head-up display system that can fully cover the driver's field of vision, allowing the virtual image to be completely integrated with the real scene, thereby reducing the driver's visual switching and improving driving comfort and safety.

[0004] A multi-focal head-up display system, comprising:

[0005] The image source module includes a first display unit for emitting a first image light, a second display unit for emitting a second image light, and a third display unit for emitting a third image light.

[0006] A first reflector is disposed on the light-emitting side of the image source module for reflecting the first image light, the second image light, and the third image light.

[0007] A second reflector, disposed on the light-emitting side of the first reflector, is used to reflect the first image light, the second image light, and the third image light reflected by the first reflector; and

[0008] An imaging unit is disposed on the light-emitting side of the second reflector and is used to reflect the first image light, the second image light, and the third image light after being reflected by the second reflector, and to form a first virtual image surface, a second virtual image surface, and a third virtual image surface, respectively.

[0009] The first display unit, the second display unit, and the third display unit have a distance difference from the first reflector. The optical distances of the first image ray, the second image ray, and the third image ray to the imaging unit are different. The projection distance of the first virtual image surface is greater than the projection distance of the third virtual image surface. The second virtual image surface is tilted between the first virtual image surface and the third virtual image surface, and the two ends of the second virtual image surface are respectively connected to the first virtual image surface and the third virtual image surface.

[0010] In the above technical solution, by setting a distance difference between the first display unit, the second display unit, and the third display unit and the first reflector, the optical distances of the first image ray, the second image ray, and the third image ray to the imaging unit are different, thereby forming a first virtual image surface, a second virtual image surface, and a third virtual image surface with different projection distances in the imaging unit. This allows the virtual image to cover the field of vision distance in front of the driver and to match the distance of the real scene, reducing the driver's visual switching between the virtual image and the real scene and reducing the driver's visual fatigue.

[0011] The projection distance of the first virtual image surface is greater than that of the third virtual image surface. The second virtual image surface is tilted between the two and connected to the first and third virtual image surfaces at both ends. On the one hand, it can realize continuous virtual images and avoid the difference in projection distance between virtual images, reducing the driver's visual switching between virtual images. On the other hand, it can make the virtual images match the real scene in driving. For example, the first virtual image surface is infinitely far away and can be integrated with the distant landscape in actual driving. The second virtual image surface is tilted at the visual center and can be integrated with the real road and road signs. The third virtual image surface has a smaller projection distance and can be integrated with the real scene in front of the vehicle. In this way, the virtual images can be perfectly matched with the real scene, further reducing the driver's visual switching and avoiding visual fatigue such as blurriness and dizziness, thus improving driving comfort and safety.

[0012] In one embodiment, the first reflector is an integral structure, and the first reflector has a continuous first reflective surface.

[0013] In the above technical solution, the first reflector is set as an integral structure, and the image light is reflected by the continuous first reflector surface, which can effectively reduce the size of the system, reduce the space occupied in the vehicle, and meet the demand for miniaturization of the head-up display system.

[0014] Furthermore, the first reflective surface includes a first reflective region for reflecting first image light, a second reflective region for reflecting second image light, and a third reflective region for reflecting third image light.

[0015] In the above technical solution, on the one hand, the first image light, the second image light, and the third image light are reflected simultaneously by a single surface, thereby reducing the number of lenses; on the other hand, the image light rays are completely separated in the usage area of ​​the first reflective surface, which can avoid the problem of crosstalk between different focal planes.

[0016] In another embodiment, the first reflector includes a first sub-reflective unit and a second sub-reflective unit, wherein the first sub-reflective unit is used to reflect the first image light and the third image light, and the second sub-reflective unit is used to reflect the second image light.

[0017] In the above technical solution, by reflecting the second image light through an independent second sub-reflection unit, the second virtual image formed by the second image light can be easily adjusted, making the connection between the second virtual image and the first and third virtual images more matched, thereby improving the display effect and reducing the difficulty of adjustment.

[0018] Furthermore, the second reflector is an integral structure, and the second reflector has a continuous second reflective surface.

[0019] In the above technical solution, the second reflector is set as an integral structure, and the image light is reflected by the continuous second reflective surface, which can effectively reduce the size of the system, reduce the space occupied in the vehicle, and meet the demand for miniaturization of the head-up display system.

[0020] Furthermore, the second reflective surface includes a fourth reflective region for reflecting the light from the first image, a fifth reflective region for reflecting the light from the second image, and a sixth reflective region for reflecting the light from the third image.

[0021] In the above technical solution, on the one hand, the first image light, the second image light, and the third image light are reflected simultaneously by a single surface, thereby reducing the number of lenses; on the other hand, the individual image light rays are completely separated in the usage area of ​​the second reflective surface, which can avoid the problem of crosstalk between different focal plane light rays.

[0022] Furthermore, the first virtual image plane and the third virtual image plane are perpendicular to the horizontal direction.

[0023] In the above technical solution, the first virtual image plane and the third virtual image plane are perpendicular to the horizontal direction, which can form a virtual image plane perpendicular to the driver's visual direction, making it easier for the driver to observe.

[0024] Furthermore, the first virtual image plane is located at the upper end of the second virtual image plane, and the third virtual image plane is located at the lower end of the second virtual image plane.

[0025] In the above technical solution, since the projection distance of the first virtual image surface is greater than that of the third virtual image surface, setting the first virtual image surface higher than the third virtual image surface can match the actual scene. Specifically, during driving, the scene above the driver's field of vision is the distant scene, such as the sky, buildings, and mountains, while the scene below the field of vision is the near scene, such as the front of the car and the nearby road. Setting the first virtual image surface, which has a larger projection distance, above can match the distant scene, thereby better integrating the virtual image with the real scene. At the same time, setting the third virtual image surface below can match the near scene, making it easier for the driver to observe.

[0026] Furthermore, light-shielding components are provided between the first display unit and the second display unit, as well as between the second display unit and the third display unit.

[0027] In the above technical solution, the light-shielding component can avoid crosstalk between image rays from different projection distances, thereby avoiding stray light problems. In existing technologies, to avoid light crosstalk, each image ray from a different projection distance needs to be configured with a corresponding reflector, resulting in an increase in the number of reflectors and the size of the system. By setting a light-shielding component, while avoiding light crosstalk, the reflective surface can be reused on a single reflector, thereby reducing the number of reflectors and achieving a multi-focal HUD using fewer reflective lenses.

[0028] Furthermore, the imaging unit is a windshield.

[0029] Compared with the prior art, the beneficial effects of this utility model are: by setting a distance difference between the first display unit, the second display unit, and the third display unit and the first reflector, the optical distances of the first image ray, the second image ray, and the third image ray to the imaging unit are different, thereby forming a first virtual image surface, a second virtual image surface, and a third virtual image surface with different projection distances in the imaging unit, so that the virtual image can cover the field of vision distance in front of the driver and can match the real scene distance, reducing the driver's visual switching between the virtual image and the real scene, and reducing the driver's visual fatigue.

[0030] The projection distance of the first virtual image surface is greater than that of the third virtual image surface. The second virtual image surface is tilted between the two and connected to the first and third virtual image surfaces at both ends. On the one hand, it can realize continuous virtual images and avoid the difference in projection distance between virtual images, reducing the driver's visual switching between virtual images. On the other hand, it can make the virtual images match the real scene in driving. For example, the first virtual image surface is infinitely far away and can be integrated with the distant landscape in actual driving. The second virtual image surface is tilted at the visual center and can be integrated with the real road and road signs. The third virtual image surface has a smaller projection distance and can be integrated with the real scene in front of the vehicle. In this way, the virtual images can be perfectly matched with the real scene, further reducing the driver's visual switching and avoiding visual fatigue such as blurriness and dizziness, thus improving driving comfort and safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the multifocal head-up display system according to the first embodiment of this utility model.

[0032] Figure 2 for Figure 1 A partial structural diagram.

[0033] Figure 3 This is a schematic diagram of the structure of the multifocal head-up display system according to the second embodiment of this utility model.

[0034] Figure 4 for Figure 3 A partial structural diagram.

[0035] Figure 5 This is a distribution diagram of the reflection area of ​​the first reflecting surface in an embodiment of the present invention.

[0036] Figure 6 This is a distribution diagram of the reflection area of ​​the second reflecting surface in an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the virtual image plane in an embodiment of the present invention.

[0038] Explanation of icon numbers:

[0039] Image source module 1, first display unit 11, second display unit 12, third display unit 13, first reflector 2, first reflective surface 21, first reflective area 211, second reflective area 212, third reflective area 213, first sub-reflective unit 22, second sub-reflective unit 23, second reflector 3, fourth reflective area 31, fifth reflective area 32, sixth reflective area 33, imaging unit 4, first virtual image surface 41, second virtual image surface 42, third virtual image surface 43, first image ray 5, second image ray 6, third image ray 7, light shield 8. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] Please refer to Figures 1 to 7 The multi-focal-plane head-up display system of this utility model mainly includes an image source module 1, a first reflector 2, a second reflector 3, and an imaging unit 4. The image source module 1 includes a first display unit 11 for emitting a first image light 5, a second display unit 12 for emitting a second image light 6, and a third display unit 13 for emitting a third image light 7. The first reflector 2 is disposed on the light-emitting side of the image source module 1 and is used to reflect the first image light 5, the second image light 6, and the third image light 7. The second reflector 3 is disposed on the light-emitting side of the first reflector 2 and is used to reflect the first image light 5, the second image light 6, and the third image light 7 after being reflected by the first reflector 2. The imaging unit 4 is disposed on the light-emitting side of the second reflector 3 and is used to reflect the first image light 5, the second image light 6, and the third image light 7 after being reflected by the second reflector 3, forming a first virtual image surface 41, a second virtual image surface 42, and a third virtual image surface 43, respectively.

[0043] Among them, the first display unit 11, the second display unit 12, and the third display unit 13 have a distance difference from the first reflector 2. The optical distances of the first image ray, the second image ray 6, and the third image ray 7 to the imaging unit 4 are different. The projection distance of the first virtual image surface 41 is greater than the projection distance of the third virtual image surface 43. The second virtual image surface 42 is tilted between the first virtual image surface 41 and the third virtual image surface 43, and the two ends of the second virtual image surface 42 are respectively connected to the first virtual image surface 41 and the third virtual image surface 43.

[0044] For example, the image source module 1 can be an existing display device, which includes at least three independent display units, namely a first display unit 11, a second display unit 12, and a third display unit 13. The three display units can independently emit image light to display different content. The first reflector 2 and the second reflector 3 can be optical reflective lenses. The imaging unit 4 can be a car windshield. The first image light 5, the second image light 6, and the third image light 7 are reflected sequentially by the first reflector 2 and the second reflector 3 to form the imaging unit 4, and are reflected by the imaging unit 4 to form a first virtual image surface 41, a second virtual image surface 42, and a third virtual image surface 43. The distance between the first display unit 11 and the first reflector 2 is greater than the distance between the third display unit 13 and the first reflector 2, so that the optical path of the first image light 5 is greater than the optical path of the second image light 6, thereby making the projection distance of the first virtual image surface 41 greater than the projection distance of the third virtual image surface 43. By adjusting the angles of the second display unit 12, the first reflector 2, and the second reflector 3, the second virtual image surface 42 can be tilted so that the projection distance gradually increases from one end to the other. The two ends of the second virtual image surface 42 are connected to the first virtual image surface 41 and the third virtual image surface 43, respectively. The three virtual image surfaces work together to form a display surface with a continuous projection distance, so that when the driver observes the displayed content, he can avoid visual switching caused by the jump in virtual image projection distance and reduce visual fatigue.

[0045] For example, according to the principle of perspective, the first virtual image surface 41 has the largest projection distance, and its fusion distance with the real scene is infinitely far, while the third virtual image surface 43 has the smallest projection distance, which can be set to a projection distance greater than or equal to 0.5m, that is, the distance from the driver's glasses to the front of the car. Then, the first virtual image surface 41 and the third virtual image surface 43 are connected by the second virtual image surface 42. In this way, the virtual image completely covers the infinite distance from the front of the car to the front, eliminating the need for the driver to switch back and forth between the image and the real scene, thus improving driving safety.

[0046] As can be seen from the above technical solution, by setting a distance difference between the first display unit 11, the second display unit 12, and the third display unit 13 and the first reflector 2, the optical distances of the first image ray, the second image ray 6, and the third image ray 7 to the imaging unit 4 are different. This results in the formation of a first virtual image surface 41, a second virtual image surface 42, and a third virtual image surface 43 with different projection distances in the imaging unit 4. This allows the virtual image to cover the driver's field of vision distance and match the real scene distance, reducing the driver's visual switching between the virtual image and the real scene and reducing the driver's visual fatigue. The projection distance of the first virtual image surface 41 is greater than that of the third virtual image surface 43. The second virtual image surface 42 is tilted between the two, and its two ends are connected to the first virtual image surface 41 and the third virtual image surface 43 respectively. On the one hand, it can realize continuous virtual images and avoid the difference in projection distance between virtual images, reducing the driver's visual switching between virtual images. On the other hand, it can make the virtual images match the real scene in driving. For example, the first virtual image surface 41 is infinitely far away and can be integrated with the distant landscape in actual driving. The second virtual image surface 42 is tilted at the visual center and can be integrated with the real road and road signs. The third virtual image surface 43 has a smaller projection distance and can be integrated with the real scene in front of the vehicle. In this way, the virtual images can be completely matched with the real scene, further reducing the driver's visual switching and avoiding visual fatigue such as blurriness and dizziness, thus improving driving comfort and safety.

[0047] Please refer to Figure 1 and Figure 2 In the first embodiment of this utility model, the first reflector 2 is an integral structure, and the first reflector 2 has a continuous first reflective surface 21. Exemplarily, the first reflective surface 21 can be a flat or curved surface covered with an optical film, wherein the optical film can be an existing optical isolation film material. By setting the first reflector 2 as an integral structure and reflecting image light through the continuous first reflective surface 21, the system size can be effectively reduced, the space occupied in the vehicle interior can be reduced, and the miniaturization requirement of the head-up display system can be met.

[0048] Please refer to Figure 5 The first reflective surface 21 includes a first reflective region 211 for reflecting the first image light 5, a second reflective region 212 for reflecting the second image light 6, and a third reflective region 213 for reflecting the third image light 7. By setting several reflective regions on the first reflective surface 21, on the one hand, it is possible to simultaneously reflect the first image light 5, the second image light 6, and the third image light 7 through a single surface, thereby reducing the number of lenses; on the other hand, the usage areas of each image light ray on the first reflective surface 21 are completely separated, which can avoid the problem of crosstalk between light rays from different focal planes.

[0049] Please refer to Figure 3 and Figure 4The second embodiment of this utility model differs from the first embodiment in that the first reflector 2 includes a first sub-reflective unit 22 and a second sub-reflective unit 23. The first sub-reflective unit 22 reflects the first image light 5 and the third image light 7, and the second sub-reflective unit 23 reflects the second image light 6. For example, both the first sub-reflective unit 22 and the second sub-reflective unit 23 can be flat or curved reflectors covered with an optical film. The second sub-reflective unit 23 is independent of the first sub-reflective unit 22, allowing the second virtual image formed by the second image light 6 to be adjusted by changing the angle and position of the second sub-reflective unit 23. This makes the connection between the second virtual image and the first and third virtual images more consistent, thereby improving the display effect and reducing the difficulty of adjustment.

[0050] The second reflector 3 is an integral structure with a continuous second reflective surface. For example, the second reflective surface can be a flat or curved surface covered with an optical film. By making the second reflector 3 an integral structure and reflecting image light through the continuous second reflective surface, the size of the system can be effectively reduced, the space occupied in the vehicle can be reduced, and the miniaturization of the head-up display system can be met.

[0051] Please refer to Figure 6 The second reflective surface includes a fourth reflective region 31 for reflecting the first image light ray 5, a fifth reflective region 32 for reflecting the second image light ray 6, and a sixth reflective region 33 for reflecting the third image light ray 7. By setting several reflective regions on the second reflective surface, on the one hand, it is possible to simultaneously reflect the first image light ray 5, the second image light ray 6, and the third image light ray 7 through a single surface, thereby reducing the number of lenses; on the other hand, the usage areas of each image light ray on the second reflective surface are completely separated, which can avoid the problem of crosstalk between light rays from different focal planes.

[0052] Please refer to Figure 7 The first virtual image plane 41 and the third virtual image plane 43 are perpendicular to the horizontal direction. The first virtual image plane 41 and the third virtual image plane 43 are perpendicular to the horizontal direction, which can form a virtual image plane perpendicular to the driver's visual direction, making it easier for the driver to observe.

[0053] The first virtual image surface 41 is located above the second virtual image surface 42, and the third virtual image surface 43 is located below the second virtual image surface 42. Since the projection distance of the first virtual image surface 41 is greater than that of the third virtual image surface 43, setting the first virtual image surface 41 higher than the third virtual image surface 43 can match the actual scene. Specifically, during driving, the scene above the driver's field of vision is the distant scene, such as the sky, buildings, and mountains, while the scene below the field of vision is the near scene, such as the front of the car and the nearby road. Setting the first virtual image surface 41, which has a larger projection distance, above can match the distant scene, thereby better integrating the virtual image with the real scene. At the same time, setting the third virtual image surface 43 below can match the near scene, making it easier for the driver to observe.

[0054] Light-shielding elements 8 are provided between the first display unit 11 and the second display unit 12, and between the second display unit 12 and the third display unit 13. The light-shielding elements 8 can prevent crosstalk between image rays from different projection distances, thereby avoiding stray light problems. In the prior art, to avoid light crosstalk, each image ray from a different projection distance needs to be configured with a corresponding reflector, resulting in an increase in the number of reflectors and the system size. By setting the light-shielding elements 8, while avoiding light crosstalk, the reflective surface can be reused on a single reflector, thereby reducing the number of reflectors and achieving a multi-focal HUD using fewer reflective lenses.

[0055] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-focal head-up display system, characterized in that, include: The image source module includes a first display unit for emitting a first image light, a second display unit for emitting a second image light, and a third display unit for emitting a third image light. A first reflector is disposed on the light-emitting side of the image source module for reflecting the first image light, the second image light, and the third image light. The second reflector is disposed on the light-emitting side of the first reflector and is used to reflect the first image light, the second image light, and the third image light after being reflected by the first reflector. as well as An imaging unit is disposed on the light-emitting side of the second reflector and is used to reflect the first image light, the second image light, and the third image light after being reflected by the second reflector, and to form a first virtual image surface, a second virtual image surface, and a third virtual image surface, respectively. The first display unit, the second display unit, and the third display unit have a distance difference from the first reflector. The optical distances of the first image ray, the second image ray, and the third image ray to the imaging unit are different. The projection distance of the first virtual image surface is greater than the projection distance of the third virtual image surface. The second virtual image surface is tilted between the first virtual image surface and the third virtual image surface, and the two ends of the second virtual image surface are respectively connected to the first virtual image surface and the third virtual image surface.

2. The multi-focal surface head-up display system according to claim 1, characterized in that, The first reflector is an integral structure and has a continuous first reflective surface.

3. The multi-focal surface head-up display system according to claim 2, characterized in that, The first reflective surface includes a first reflective region for reflecting light from a first image, a second reflective region for reflecting light from a second image, and a third reflective region for reflecting light from a third image.

4. The multi-focal surface head-up display system according to claim 1, characterized in that, The first reflector includes a first sub-reflective unit and a second sub-reflective unit. The first sub-reflective unit is used to reflect the first image light and the third image light, and the second sub-reflective unit is used to reflect the second image light.

5. The multi-focal surface head-up display system according to claim 1, characterized in that, The second reflector is an integral structure and has a continuous second reflective surface.

6. The multi-focal surface head-up display system according to claim 5, characterized in that, The second reflective surface includes a fourth reflective region for reflecting light from the first image, a fifth reflective region for reflecting light from the second image, and a sixth reflective region for reflecting light from the third image.

7. The multi-focal surface head-up display system according to claim 1, characterized in that, The first virtual image plane and the third virtual image plane are perpendicular to the horizontal direction.

8. The multi-focal surface head-up display system according to claim 7, characterized in that, The first virtual image plane is located at the upper end of the second virtual image plane, and the third virtual image plane is located at the lower end of the second virtual image plane.

9. The multi-focal surface head-up display system according to claim 1, characterized in that, A light-shielding element is provided between the first display unit and the second display unit, and between the second display unit and the third display unit.

10. The multi-focal surface head-up display system according to claim 1, characterized in that, The imaging unit is a windshield.

Images