Head-up display system and vehicle

Abstract

The utility model relates to the technical field of vehicle-mounted head-up display, and discloses a head-up display system and a vehicle. Two opposite surfaces of a target reflector of the head-up display system are respectively provided with a first reflecting film and a second reflecting film, the first reflecting film is used for reflecting a first part of image source light to form first projection light, and the second reflecting film is used for reflecting a second part of the image source light to form second projection light. The first projection light and the second projection light have an optical path difference, the first projection light is configured to be projected to the windshield of the vehicle to form a first virtual image, and the second projection light is configured to be projected to the windshield of the vehicle to form a second virtual image. By means of the mode, the head-up display system can project different virtual images, the overall size of the head-up display system can be reduced, and the cost of the head-up display system can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle head-up display technology, and in particular to a head-up display system and a vehicle. BACKGROUND

[0002] An augmented reality head-up display (AR-HUD) is a technology that magnifies and projects image information of an optical engine into a real scene. In recent years, with the rapid development of intelligent cockpits, AR-HUD has been widely applied to the automotive field. AR-HUD can project important information such as ADAS (Advanced Driving Assistance System) information into the driver's forward field of view, so that the driver no longer needs to frequently look down at the vehicle screen, thereby improving driving safety.

[0003] Most of the AR-HUDs commonly used on the market can only project a single picture. In a picture of limited size, both vehicle basic information and AR interaction information need to be projected, resulting in too much information to be presented on the same picture, which affects the driver's observation of the live scene and is not conducive to safe driving. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a head-up display system and a vehicle, which can project different virtual images and reduce the overall size and cost of the head-up display system.

[0005] The present application provides a head-up display system. The head-up display system includes an image source device configured to output image source light. The head-up display system further includes a target mirror having two opposite surfaces respectively provided with a first reflective film and a second reflective film. The first reflective film is configured to reflect a first portion of the image source light to form first projection light, and the second reflective film is configured to reflect a second portion of the image source light to form second projection light. The first projection light and the second projection light have an optical path difference. The first projection light is configured to be projected onto a windshield of a vehicle to form a first virtual image, and the second projection light is configured to be projected onto the windshield of the vehicle to form a second virtual image.

[0006] In an embodiment of the present application, the reflectivity of the first portion on the first reflective film is greater than the transmittance of the first portion on the first reflective film, and the transmittance of the second portion on the first reflective film is greater than the reflectivity of the second portion on the first reflective film. The reflectivity of the second portion on the second reflective film is greater than the transmittance of the second portion on the second reflective film.

[0007] In an embodiment of the present application, the first projection light and the second projection light have different polarization directions.

[0008] In an embodiment of the present application, the first projection light and the second projection light have different wavelengths.

[0009] In an embodiment of the present application, one of the first projection light and the second projection light is S-polarized light, and the other is P-polarized light; or, one of the first projection light and the second projection light is red light, and the other is blue-green light.

[0010] In an embodiment of the present application, the head-up display system further comprises a first mirror for receiving the image source light, and a second mirror for receiving the reflected light from the first mirror and reflecting to the windshield of the vehicle; wherein the first mirror is the target mirror.

[0011] In an embodiment of the present application, the head-up display system further comprises a first mirror for receiving the image source light, and a second mirror for receiving the reflected light from the first mirror and reflecting to the windshield of the vehicle; wherein the second mirror is the target mirror.

[0012] In an embodiment of the present application, the focal length of the first mirror is f1, and the focal length of the second mirror is f2, satisfying: 0<|f1| / |f2|<1.

[0013] In an embodiment of the present application, the focal length of the optical system composed of the first mirror, the second mirror and the windshield is f, and the focal length of the first mirror is f1, satisfying: 0<|f1| / |f|<2.

[0014] Correspondingly, the present application also provides a vehicle comprising a windshield and a head-up display system as described in the above embodiments.

[0015] The present application has the beneficial effect that, different from the prior art, the present application provides a head-up display system and a vehicle. The target mirror of the head-up display system is provided with a first reflecting film and a second reflecting film on two surfaces opposite to each other, the first projection light reflected by the first reflecting film and the second projection light reflected by the second reflecting film have a path difference, and thus the first virtual image and the second virtual image are projected. Therefore, the present application can realize the head-up display system to project different virtual images.

[0016] Moreover, the present application provides the first reflecting film and the second reflecting film on the two surfaces opposite to each other of the target mirror, without the need for multiple image source devices or multiple sets of reflecting systems, so that the head-up display system can project different virtual images, which is beneficial to reduce the overall volume of the head-up display system and reduce the cost of the head-up display system. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 is a structural schematic diagram of a first embodiment of the head-up display system of the present application;

[0019] Figure 2 is a structural schematic diagram of a second embodiment of the head-up display system of the present application.

[0020] Explanation of reference signs:

[0021] 10 head-up display system; 11 image source device; 12a target mirror; 121 first mirror; 122 second mirror; 13 first reflecting film; 14 second reflecting film; 20 windshield; 30 eye box.

[0022] O image source light; M1 first projection light; M2 second projection light; N1 first virtual image; N2 second virtual image. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely in the following description of the embodiments of the present application with reference to the drawings. Obviously, the described embodiments only constitute some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified and limited, the terms such as "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the present application, unless otherwise specified and limited, the terms such as "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The application provides a head-up display system and a vehicle, which are described in detail below. It should be noted that the description order of the following embodiments is not used as a limitation on the preferred order of the embodiments of the application. Moreover, the description of each embodiment in the following embodiments has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0026] To solve the technical problem that the AR-HUD can only project a single picture in the prior art, an embodiment of the application provides a head-up display system. The head-up display system comprises an image source device, which is configured to output image source light. The head-up display system further comprises a target mirror, which has a first reflecting film and a second reflecting film arranged on two opposite surfaces, respectively. The first reflecting film is configured to reflect a first part of the image source light to form a first projection light, and the second reflecting film is configured to reflect a second part of the image source light to form a second projection light. The first projection light and the second projection light have an optical path difference. The first projection light is configured to be projected to a windshield of a vehicle to form a first virtual image, and the second projection light is configured to be projected to the windshield of the vehicle to form a second virtual image. Details are described below.

[0027] Please refer to Figure 1 , Figure 1 which is a structural schematic diagram of the first embodiment of the head-up display system of the application.

[0028] In an embodiment, the vehicle comprises a windshield 20 and a head-up display system 10, which projects image information into the front field of view of the driver through the windshield 20. The head-up display system 10 can use display technologies such as AR-HUD. The head-up display system 10 can project different pictures. Specifically, the head-up display system 10 can use a far-near bifocal surface projection, and can project pictures with different distances according to different needs, for example, project basic vehicle driving information on a near-focal picture with a distance of about 2-3 meters, and project interactive information fused with AR on a far-focal picture with a distance of more than 8 meters.

[0029] Specifically, the head-up display system 10 comprises an image source device 11, which is configured to output image source light O. The head-up display system 10 further comprises a target mirror 12a, which has a first reflecting film 13 and a second reflecting film 14 arranged on two opposite surfaces, respectively. The first reflecting film 13 is configured to reflect a first part of the image source light O to form a first projection light M1, and the second reflecting film 14 is configured to reflect a second part of the image source light O to form a second projection light M2. The first projection light M1 and the second projection light M2 have an optical path difference. The first projection light M1 is configured to be projected to a windshield 20 of a vehicle to form a first virtual image N1, and the second projection light M2 is configured to be projected to the windshield 20 of the vehicle to form a second virtual image N2.

[0030] In the above manner, the target mirror 12a of the head-up display system 10 is provided with the first reflecting film 13 and the second reflecting film 14 on two opposite surfaces respectively, the first reflecting film 13 reflects the first projection light M1 formed and the second reflecting film 14 reflects the second projection light M2 formed, and the first projection light M1 and the second projection light M2 have an optical path difference, and then the first virtual image N1 and the second virtual image N2 are projected. Therefore, the head-up display system 10 can project different virtual images.

[0031] In addition, in the prior art, if the AR-HUD is required to project multiple images, multiple optical machines or multiple optical reflection systems are often required, which undoubtedly greatly increases the cost and the size of the whole machine, and is not conducive to the landing of the product. The first reflecting film 13 and the second reflecting film 14 are arranged on the two opposite surfaces of the target mirror 12a, multiple image source devices 11 or multiple reflection systems are not required, and different virtual images can be projected by the head-up display system 10, which is conducive to reducing the size of the head-up display system 10 and reducing the cost of the head-up display system 10.

[0032] It should be noted that one of the first virtual image N1 and the second virtual image N2 can be the near-focus image, and the other can be the far-focus image. The embodiment of the application takes the first virtual image N1 as the near-focus image and the second virtual image N2 as the far-focus image as an example for illustration, which is only required for discussion and is not limited.

[0033] The first part of the image source light O has a reflectivity greater than a transmittance of the first part in the first reflecting film 13, and the second part of the image source light O has a transmittance greater than a reflectivity of the second part in the first reflecting film 13, that is, the first reflecting film 13 is configured to reflect the first part of the image source light O and transmit the second part. The second part has a reflectivity greater than a transmittance of the second part in the second reflecting film 14, that is, the second reflecting film 14 is configured to reflect the second part of the image source light O. In this way, when the image source light O is transmitted to the target mirror 12a, the first part is reflected in the first reflecting film 13 to form the first projection light M1, and the second part is transmitted through the first reflecting film 13 and reflected in the second reflecting film 14 to form the second projection light M2, the first projection light M1 and the second projection light M2 have an optical path difference, and finally the first projection light M1 is projected to the windshield 20 of the vehicle, and the driver can observe the first virtual image N1, and the second projection light M2 is projected to the windshield 20 of the vehicle, and the driver can observe the second virtual image N2.

[0034] In an embodiment, the first projection light ray M1 and the second projection light ray M2 have different polarization directions, and the first reflective film 13 and the second reflective film 14 exhibit different reflectivity and transmittance for light rays with different polarization directions. Specifically, one of the first projection light ray M1 and the second projection light ray M2 is S-polarized light, and the other is P-polarized light. Taking the first projection light ray M1 as S-polarized light and the second projection light ray M2 as P-polarized light as an example, the first reflective film 13 is configured to reflect S-polarized light and transmit P-polarized light, and the second reflective film 14 is configured to reflect P-polarized light.

[0035] Specifically, the head-up display system 10 includes a first mirror 121 and a second mirror 122. The first mirror 121 is configured to receive the image source light ray O, and the second mirror 122 is configured to receive the reflected light from the first mirror 121 and reflect it to the windshield 20 of the vehicle. The first mirror 121 is a target mirror 12a, i.e., the two surfaces of the first mirror 121 opposite to each other are provided with the first reflective film 13 and the second reflective film 14, respectively.

[0036] The image source device 11 outputs the image source light ray O. When the image source light ray O is transmitted to the first mirror 121, the S-polarized light in the image source light ray O is reflected at the first reflective film 13 to form the first projection light ray M1, and the P-polarized light transmits through the first reflective film 13 and is reflected at the second reflective film 14 to form the second projection light ray M2. The first projection light ray M1 and the second projection light ray M2 are reflected to the windshield 20 of the vehicle via the second mirror 122. The first projection light ray M1 and the second projection light ray M2 have an optical path difference. When the first projection light ray M1 is projected to the windshield 20 of the vehicle, the windshield 20 reflects the first projection light ray M1 to the eyebox 30, so that the driver can observe the first virtual image N1. When the second projection light ray M2 is projected to the windshield 20 of the vehicle, the windshield 20 reflects the second projection light ray M2 to the eyebox 30, and the driver can observe the second virtual image N2. The first virtual image N1 and the second virtual image N2 are projected at different distance positions in front of the driver, achieving the effect of far-near bifocal imaging.

[0037] Optionally, the image source device 11 can apply display technologies such as DLP (Digital Light Processing), LBS (Laser Beam Scanning), LCOS (Liquid Crystal On Silicon projection), microLED (Micro Light Emitting Diode), etc. The first mirror 121 can be a small curved mirror, etc., and the second mirror 122 can be a large curved mirror, etc. In addition, the curved mirror types of the first mirror 121 and the second mirror 122 can be free curved mirrors, aspheric mirrors, etc., which are not limited herein.

[0038] In an embodiment, the focal length of the first mirror 121 is f1, and the focal length of the second mirror 122 is f2, satisfying: 0<|f1| / |f2|<1. In the above manner, the embodiment is beneficial to ensure the reasonable imaging of the first virtual image N1 and the second virtual image N2 by reasonably setting the focal length of the first mirror 121 and the focal length of the second mirror 122. The focal length of the optical system composed of the first mirror 121, the second mirror 122 and the windshield 20 is f, satisfying: 0<|f1| / |f|<2. In the above manner, the embodiment is beneficial to ensure the reasonable imaging of the first virtual image N1 and the second virtual image N2 by reasonably setting the focal length of the first mirror 121 and the focal length of the second mirror 122.

[0039] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a second embodiment of the head-up display system of the present application.

[0040] In an alternative embodiment, the embodiment differs from the above-mentioned embodiments in that the second mirror 122 is the target mirror 12a, i.e., the two surfaces of the second mirror 122 opposite to each other are respectively provided with the first reflective film 13 and the second reflective film 14.

[0041] The image source device 11 outputs image source light rays O, which are reflected by the first mirror 121 to the second mirror 122. When the image source light rays O are transmitted to the second mirror 122, the S-polarized light in the image source light rays O is reflected by the first reflecting film 13 to form the first projection light rays M1, and the P-polarized light transmits through the first reflecting film 13 and is reflected by the second reflecting film 14 to form the second projection light rays M2. The first projection light rays M1 and the second projection light rays M2 have an optical path difference. When the first projection light rays M1 are projected to the windshield 20 of the vehicle, the windshield 20 reflects the first projection light rays M1 to the eyebox 30, so that the driver can observe the first virtual image N1. When the second projection light rays M2 are projected to the windshield 20 of the vehicle, the windshield 20 reflects the second projection light rays M2 to the eyebox 30, so that the driver can observe the second virtual image N2. The first virtual image N1 and the second virtual image N2 are projected at different distance positions in front of the driver, achieving the effect of dual-focal surface imaging.

[0042] In an alternative embodiment, the embodiment is different from the above-mentioned embodiments in that the first projection light rays M1 and the second projection light rays M2 have different wavelengths, and the first reflecting film 13 and the second reflecting film 14 exhibit different reflectivity and transmittance for light rays of different wavelengths. Specifically, one of the first projection light rays M1 and the second projection light rays M2 is red light, and the other is blue-green light. Taking the case that the first projection light rays M1 are blue-green light and the second projection light rays M2 are red light as an example, the first reflecting film 13 is configured to reflect blue-green light and transmit red light, and the second reflecting film 14 is configured to reflect red light.

[0043] The first mirror 121 is a target mirror 12a, that is, the two surfaces of the first mirror 121 opposite to each other are respectively provided with the first reflecting film 13 and the second reflecting film 14. The image source device 11 outputs image source light rays O. When the image source light rays O are transmitted to the first mirror 121, the blue-green light in the image source light rays O is reflected by the first reflecting film 13 to form the first projection light rays M1, and the red light transmits through the first reflecting film 13 and is reflected by the second reflecting film 14 to form the second projection light rays M2. The first projection light rays M1 and the second projection light rays M2 are reflected by the second mirror 122 to the windshield 20 of the vehicle. The first projection light rays M1 and the second projection light rays M2 have an optical path difference. When the first projection light rays M1 are projected to the windshield 20 of the vehicle, the windshield 20 reflects the first projection light rays M1 to the eyebox 30, so that the driver can observe the first virtual image N1. When the second projection light rays M2 are projected to the windshield 20 of the vehicle, the windshield 20 reflects the second projection light rays M2 to the eyebox 30, so that the driver can observe the second virtual image N2. The first virtual image N1 and the second virtual image N2 are projected at different distance positions in front of the driver, achieving the effect of dual-focal surface imaging.

[0044] In an alternative embodiment, the embodiment is different from the above-mentioned embodiments in that the second mirror 122 is the target mirror 12a, that is, the two surfaces of the second mirror 122 are respectively provided with the first reflecting film 13 and the second reflecting film 14.

[0045] The image source device 11 outputs image source light O, and the image source light O is reflected by the first mirror 121 to the second mirror 122. When the image source light O is transmitted to the second mirror 122, the blue-green light in the image source light O is reflected by the first reflecting film 13 to form the first projection light M1, and the red light transmits through the first reflecting film 13 and is reflected by the second reflecting film 14 to form the second projection light M2. The first projection light M1 and the second projection light M2 have an optical path difference. When the first projection light M1 is projected to the windshield 20 of the vehicle, the windshield 20 reflects the first projection light M1 to the eyebox 30, so that the driver can observe the first virtual image N1. When the second projection light M2 is projected to the windshield 20 of the vehicle, the windshield 20 reflects the second projection light M2 to the eyebox 30, and the driver can observe the second virtual image N2. The first virtual image N1 and the second virtual image N2 are projected at different distance positions in front of the driver, achieving the effect of forming a far-near bifocal surface image.

[0046] In summary, the application provides a head-up display system and a vehicle. The target mirror of the head-up display system is provided with a first reflecting film and a second reflecting film on the two opposite surfaces, respectively, the first projection light reflected by the first reflecting film and the second projection light reflected by the second reflecting film have an optical path difference, and then the first virtual image and the second virtual image are projected. Therefore, the application can realize that the head-up display system projects different virtual images. Moreover, the application sets the first reflecting film and the second reflecting film on the two opposite surfaces of the target mirror, without the need for multiple image source devices or multiple sets of reflecting systems, so as to realize that the head-up display system projects different virtual images, which is beneficial to reduce the overall volume of the head-up display system and reduce the cost of the head-up display system. The head-up display system of the application uses a single optical engine to realize bifocal surface projection without increasing the overall volume, which is beneficial to reduce the cost and has a simple assembly process, which is beneficial to product localization.

[0047] The head-up display system and the vehicle provided by the application are described in detail above, and specific examples are applied to describe the principles and implementation modes of the application. The above embodiment is only used to help understand the method and core idea of the application; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the content of the specification should not be understood as a limitation of the application.

Claims

1. A head-up display system, characterized by, Comprising: an image source device configured to output image source light rays; and a target mirror having two opposite surfaces respectively provided with a first reflective film and a second reflective film, the first reflective film being configured to reflect a first portion of the image source light rays to form first projection light rays, the second reflective film being configured to reflect a second portion of the image source light rays to form second projection light rays, such that the first projection light rays and the second projection light rays have an optical path difference, the first projection light rays being configured to be projected to a windshield of a vehicle to form a first virtual image, the second projection light rays being configured to be projected to the windshield of the vehicle to form a second virtual image.

2. The head-up display system of claim 1, wherein a reflectivity of the first portion at the first reflective film is greater than a transmittance of the first portion at the first reflective film, and a transmittance of the second portion at the first reflective film is greater than a reflectivity of the second portion at the first reflective film; a reflectivity of the second portion at the second reflective film is greater than a transmittance of the second portion at the second reflective film.

3. The head-up display system of claim 1 or 2, wherein the first projection light rays and the second projection light rays have different polarization directions.

4. The head-up display system of claim 1 or 2, wherein the first projection light rays and the second projection light rays have different wavelengths.

5. The head-up display system of claim 1 or 2, wherein one of the first projection light rays and the second projection light rays is S-polarized light, and the other is P-polarized light; or one of the first projection light rays and the second projection light rays is red light, and the other is blue-green light.

6. The head-up display system of claim 1, further comprising: a first mirror configured to receive the image source light rays; and a second mirror configured to receive reflected light from the first mirror and reflect to the windshield of the vehicle; wherein the first mirror is the target mirror.

7. The head-up display system of claim 1, further comprising: a first mirror configured to receive the image source light rays; and a second mirror configured to receive reflected light from the first mirror and reflect to the windshield of the vehicle; wherein the second mirror is the target mirror.

8. The head-up display system of claim 6 or 7, wherein a focal length of the first mirror is f1, and a focal length of the second mirror is f2, satisfying: 0<|f1| / |f2|<1.

9. The head-up display system of claim 6 or 7, wherein a focal length of an optical system composed of the first mirror, the second mirror, and the windshield is f, and a focal length of the first mirror is f1, satisfying: 0<|f1| / |f|<2. a windshield and a head-up display system according to any one of claims 1 to 9. ​ 10. A vehicle characterized by comprising: ​

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