Augmented reality head-up display system, automobile

Abstract

The present application discloses an augmented reality head-up display system and a car. The display system includes a first image generating unit for projecting a near-view image to a first reflecting unit; a second image generating unit for projecting a far-view image to a second emitting unit; a first reflecting unit for forming a first virtual image within a first imaging distance through a windshield unit; a second reflecting unit for forming a second virtual image within a second imaging distance through a windshield unit; and also includes: a windshield unit, wherein a diffraction grating is provided on the windshield unit. The present application solves the technical problem that the head-up display system has poor imaging effect on augmented reality optical images. Through the present application, the utilization rate of light energy is improved, the power consumption and heat dissipation requirements of the head-up display system are reduced, while at the same time ensuring a high transmittance of external ambient light, which will not affect the driver's judgment of the road conditions.

Description

Technical Field

[0001] The present application relates to the field of augmented reality and head-up display devices, and more specifically, to an augmented reality head-up display system and a car. Background Art

[0002] The augmented reality head-up display system can overlay navigation information, vehicle system information and actual road conditions to enhance the driving experience.

[0003] The inventors found that when imaging through the windshield, the light energy utilization rate is poor, thereby increasing the power consumption of the head-up display system. At the same time, if the light energy utilization rate is improved, the light transmittance will be reduced, thereby affecting the driver's judgment of the road conditions.

[0004] Currently, no effective solution has been proposed to the problem that the head-up display system in the related art has poor optical image processing effect for augmented reality. Summary of the invention

[0005] The main purpose of the present application is to provide an augmented reality head-up display system and a car to solve the problem that the optical image processing effect of the head-up display system for augmented reality is poor.

[0006] In order to achieve the above objective, according to one aspect of the present application, an augmented reality head-up display system is provided.

[0007] The augmented reality head-up display system according to the present application includes: a first image generating unit, used to project a near-view image to a first reflecting unit; a second image generating unit, used to project a far-view image to a second emitting unit; a first reflecting unit, used to form a first virtual image within a first imaging distance through a windshield unit; a second reflecting unit, used to form a second virtual image within a second imaging distance through a windshield unit; and also includes: a windshield unit, on which a diffraction grating is arranged.

[0008] Furthermore, a blazed grating is provided on the windshield unit.

[0009] Furthermore, a rectangular wave phase grating is provided on the windshield unit.

[0010] Further, the number of layers of diffraction gratings provided on the windshield unit corresponds to the number of light source types of the first image generating unit or the second image generating unit.

[0011] Furthermore, the diffraction grating is arranged in the middle layer of the windshield unit.

[0012] Furthermore, the first reflection unit adopts at least one free-form surface reflection mirror.

[0013] Furthermore, the second reflection unit uses at least two free-form surface reflection mirrors.

[0014] Furthermore, the first image generating unit includes: any one or more of LCD, LED, OLED, LCOS or DLP display devices.

[0015] Furthermore, the second image generating unit is any one or more of LCD, LED, OLED, LCOS or DLP display devices.

[0016] In order to achieve the above objective, according to another aspect of the present application, a car is provided, which is equipped with the above-mentioned augmented reality head-up display system.

[0017] In the embodiment of the present application, a dual-layer image display method is adopted. By providing a diffraction grating on the windshield unit, the purpose of layered display of close-up images and distant images is achieved, thereby achieving the technical effect of improving the utilization rate of light energy and reducing the power consumption of the system, and further solving the technical problem of poor optical image imaging processing effect of the head-up display system for augmented reality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0019] Figure 1 is a structural diagram of an augmented reality head-up display system according to an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the structure of an augmented reality head-up display system according to a specific embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a blazed grating according to an embodiment of the present application;

[0022] Figure 4 Schematic diagram of a rectangular wave phase grating according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] like Figure 1As shown, the system includes: a first image generating unit 10, which is used to project a near-view image to the first reflecting unit; a second image generating unit 30, which is used to project a far-view image to the second reflecting unit; a first reflecting unit 20, which is used to form a first virtual image within a first imaging distance through a windshield unit; a second reflecting unit 40, which is used to form a second virtual image within a second imaging distance through a windshield unit; and a windshield unit 50, on which a diffraction grating 60 is provided. The near-view image is used to project the first image generating unit 10, and the near-view image usually has a small depth of field, and can be used to display vehicle information that needs to be displayed frequently, such as vehicle speed, fuel volume, and temperature, within the first imaging distance. The far-view image is used to project the second image generating unit 30, and the far-view image usually has a large depth of field, and can be used to superimpose navigation information and actual road conditions within the second imaging distance, and display information such as front vehicle collision warning, vehicle distance monitoring and warning, and lane departure warning in combination with the ADAS module to improve driving safety. The images in the first image generating unit 10 and the second image generating unit 30 can be respectively reflected by the first reflecting unit 20 and the second reflecting unit 40, and then reflected by the windshield unit 50 for imaging. By setting the diffraction grating 60 in the windshield unit 50 and making a microstructure with optical diffraction effect in the imaging beam projection area of ​​the windshield unit 50, the reflectivity of the imaging beam can be significantly improved, the light energy utilization rate is improved, the power consumption and heat dissipation requirements of the LED are reduced, and at the same time, the high transmittance of the external ambient light can be ensured, which will not affect the driver's judgment of the road conditions. Preferably, as Figure 3 As shown, a blazed grating is provided on the windshield unit 50. Preferably, as Figure 4 As shown, a rectangular wave phase grating is provided in the windshield unit 50. Specifically, in the embodiments of the present application, a reflective diffraction grating such as a rectangular wave phase grating or a blazed grating is used. The microstructure diagram of the diffraction grating is shown in FIG. Figure 3 or Figure 4 shown. Figure 3 It is a phase-type blazed grating. Figure 4 It is a rectangular wave phase grating. Figure 3 and Figure 4 The size of the microstructures is on the order of the wavelength of light.

[0030] The implementation principle of this application is as follows:

[0031] In addition to the reflection of the free-form reflector, the imaging beam also needs to be reflected by the windshield to enter the eye box area (Eye Box). The reflectivity of the windshield to the imaging beam is about 20%, resulting in about 80% energy loss of the LED, and at the same time brings difficulties to the heat dissipation of the LED. In order to improve the reflectivity of the windshield, a reflective film with a certain reflectivity is usually pasted on the inside of the windshield, but at the same time it reduces the transmittance of the external ambient light, which may affect the driver's judgment of the road condition information, thereby affecting driving safety. By making a microstructure with optical diffraction effect in the imaging beam projection area of ​​the windshield, the reflectivity of the imaging beam can be significantly improved, the utilization rate of light energy can be improved, the power consumption and heat dissipation requirements of the LED can be reduced, and at the same time the high transmittance of the external ambient light can be guaranteed, which will not affect the driver's judgment of the road condition.

[0032] In the embodiment of the present application, two different imaging optical paths are used to realize dual-layer display of distant images and near-field images. The corresponding depth of field in the second image generation unit 30 is relatively large, so that the virtual image surface and the road conditions can be superimposed on each other, forming an augmented reality effect, allowing the driver to observe the real road environment while obtaining driving prompt information, thereby improving driving safety. Since the vehicle driving information of the first image generation unit 10, including information such as vehicle speed, temperature, and fuel level, needs to be displayed for a long time and cannot block the driver's front line of sight, the display screen of the driving information needs to be separated from the auxiliary driving information displayed by the second image generation unit 30.

[0033] From the above description, it can be seen that the present application achieves the following technical effects:

[0034] In the embodiment of the present application, a dual-layer image display method is adopted. By providing a diffraction grating on the windshield unit, the purpose of layered display of close-up images and distant images is achieved, thereby achieving the technical effect of improving the utilization rate of light energy and reducing the power consumption of the system, and further solving the technical problem of poor optical image imaging processing effect of the head-up display system for augmented reality.

[0035] like Figure 2 As shown, it includes: windshield 1, eye box area 2, PGU1 distant image generation unit 3, PGU2 close-up image generation unit 4, first free-form surface 5, and second free-form surface 6. PGU1 distant image generation unit 3 is reflected by the second free-form surface 6 reflector, and then reflected by the windshield to form an image. PGU2 close-up image generation unit 4 is reflected by the second free-form surface 6 and the first free-form surface 5 reflectors in turn, and then reflected by the windshield to form an image.

[0036] As a preference in this embodiment, the number of layers of diffraction gratings 60 provided on the windshield unit 50 corresponds to the number of light source types of the first image generating unit or the second image generating unit. Specifically, since the diffraction grating is selective to the wavelength of light, if the first image generating unit 10 or the second image generating unit 30 adopts a monochromatic wavelength light source, such as a single wavelength semiconductor laser, then there may be only one layer of diffraction grating corresponding to the wavelength of light on the windshield. If the first image generating unit 10 or the second image generating unit 30 adopts a light source of three monochromatic wavelengths of RGB or a wide spectrum light source, such as an LCD backlight light source, then there needs to be three layers of diffraction gratings corresponding to the three wavelengths of RGB on the windshield.

[0037] As a preferred embodiment of the present invention, the diffraction grating 60 is disposed in the middle interlayer of the windshield unit. Considering that the windshield is usually composed of two layers of glass and a PVB transparent plastic layer sandwiched between the two layers of glass, the diffraction grating can also be sandwiched in the interlayer of the windshield.

[0038] As a preference in this embodiment, the first reflecting unit 20 uses at least one free-form surface reflecting mirror. Figure 2 As shown, the first reflection unit 20 of the close-up image generation unit reflects through a single free-form surface reflector, and then reflects through the windshield to form an image, and the imaging distance is about 2.5 meters. The field of view of the close-up image is 5°×1°, that is, the horizontal field of view is 5°, the vertical field of view is 1°, the lower viewing angle is -6°, and the imaging distance is 2.5 meters (which can be used as the first imaging distance). The lower viewing angle of -6° means that the driver's horizontal line of sight is 6 degrees downward.

[0039] As a preference in this embodiment, the second reflection unit uses at least two free-form surface reflection mirrors. Specifically, Figure 2 As shown, the image generating unit second image generating unit 30 is reflected by two free-form surface reflectors, and then reflected by the windshield for imaging, and the image depth of field is 7 to 10 meters. The field of view of the long-range image is 10°×3°, that is, the horizontal field of view is 10°, the vertical field of view is 4°, the lower viewing angle is -2.75°, and the imaging distance is 7 to 10 meters (which can be used as the second imaging distance). The lower viewing angle of -2.75° means that the driver's horizontal line of sight is 2.75 degrees downward.

[0040] As a preference in this embodiment, the first image generating unit includes: any one or more of LCD, LED, OLED, LCOS or DLP display devices. In the embodiments of the present application, the display device used by the image generating unit is not limited, and those skilled in the art can select different display devices according to actual conditions.

[0041] As a preference in this embodiment, the second image generating unit is any one or more of LCD, LED, OLED, LCOS or DLP display devices. In the embodiments of the present application, the display device used by the image generating unit is not limited, and those skilled in the art can select different display devices according to actual conditions.

[0042] In addition, in another embodiment of the present application, a car is also provided, including the above-mentioned augmented reality head-up display system, and its implementation principle and beneficial effects are as described above and will not be repeated.

[0043] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0044] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An augmented reality head-up display system, characterized in that: include: A first image generating unit, used for projecting a near-field image to a first reflecting unit; A second image generating unit, used for projecting a distant image to a second transmitting unit; A first reflecting unit, used for forming a first virtual image within a first imaging distance through a windshield unit; A second reflecting unit, used for forming a second virtual image within a second imaging distance through the windshield unit; It also includes: a windshield unit, on which a diffraction grating is arranged; The number of layers of diffraction gratings provided on the windshield unit corresponds to the number of light source types of the first image generating unit or the second image generating unit; The first reflection unit adopts at least one free-form surface reflection mirror; the second reflection unit adopts at least two free-form surface reflection mirrors; The windshield unit is provided with a blazed grating.

2. The augmented reality head-up display system according to claim 1, characterized in that: The windshield unit is provided with a rectangular wave phase grating.

3. The augmented reality head-up display system according to claim 1, characterized in that: The diffraction grating is arranged in the middle layer of the windshield unit.

4. The augmented reality head-up display system according to claim 1, characterized in that: The first reflection unit uses at least one free-form surface reflection mirror.

5. The augmented reality head-up display system according to claim 1, characterized in that: The second reflection unit uses at least two free-form surface reflection mirrors.

6. The augmented reality head-up display system according to claim 1, characterized in that: The first image generating unit includes: any one or more of LCD, LED, OLED, LCOS or DLP display devices.

7. The augmented reality head-up display system according to claim 1, characterized in that: The second image generating unit is any one or more of LCD, LED, OLED, LCOS or DLP display devices.

8. A car, characterized in that: It has an augmented reality head-up display system as described in any one of claims 1 to 7.

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