Augmented reality head-up display device, light path system and vehicle
By using a combination technology of external projection optical machine and diffraction waveguide in augmented reality head-up display equipment, the problems of image quality decline and distortion in existing equipment are solved, and high-quality image display and improved light energy utilization are achieved.
Patent Information
- Application Number
- CN202311188860.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-14
- Publication Date
- 2025-03-14
AI Technical Summary
When existing augmented reality head-up display devices are imaged outside the vehicle, the front windshield surface type participates in dilatation of the pupil, resulting in image quality deterioration and distortion, resulting in blurred and uncomfortable images.
An external projection optical machine is used to emit polarized light, and the total reflection pupil is dilated through the diffraction waveguide, and the polarizer, 1/4 wave plate and curved mirror are distributed up and down the diffraction waveguide to achieve efficient use of light and aberration correction.
Improve the quality of the displayed image, reduce image quality drop and distortion, eliminate crosstalk caused by ambient light, and reduce device volume.
Smart Images
Figure CN119620396A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a display device, and in particular to an augmented reality head-up display device, an optical path system and a vehicle. Background Art
[0002] Head up display (HUD) functions as a "projector" for car information. This technology can project car-related information in front of the driver's line of sight, thereby reducing the frequency of looking down at the instrument or central control screen during driving. At present, the mainstream HUD is mainly divided into combined type (C-HUD) and windshield type (W-HUD). Technically, C-HUD has a simple optical structure and is relatively easy to design, but its display size and projection distance are limited, and it may cause secondary damage to the driver in the event of a vehicle collision. The W-HUD display effect is more integrated, but its optical structure is complex, and it is difficult to design and arrange. It occupies a large volume, and its optical principle needs to be coordinated with a windshield with a complex surface, which undoubtedly increases the difficulty of preparation and mass production.
[0003] In recent years, the augmented reality head-up display (AR-HUD) based on optical waveguides superimposes digital images on the real environment outside the car, allowing the driver to obtain augmented reality visual effects. It can be used for AR navigation, adaptive cruise control, lane departure warning, etc. Compared with the current mainstream C-HUD and W-HUD, AR-HUD has the characteristics of small size, long projection distance, large field of view, and high universality. However, since the current vehicle windshield surface is involved in the imaging optical path after pupil expansion, it will cause image quality degradation and distortion problems, resulting in the driver's observation of blurred images, dizziness and other discomfort. Summary of the invention
[0004] The purpose of the present invention is to provide an augmented reality head-up display device that effectively improves the quality of displayed images and the utilization rate of light energy.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] An augmented reality head-up display device comprises a projection optical machine, a diffraction waveguide, a polarizer, a quarter wave plate, a curved reflector and a windshield, wherein the diffraction waveguide comprises an incoupling region and an outcoupling region, the projection optical machine is arranged at one end of the incoupling region of the diffraction waveguide, the polarizer, the diffraction waveguide, the quarter wave plate and the curved reflector are arranged in sequence from top to bottom, and the polarizer, the quarter wave plate and the curved reflector are distributed at one end of the outcoupling region of the diffraction waveguide, and the windshield is arranged obliquely above the polarizer.
[0007] Furthermore, the projection optical machine emits polarized light to the coupling-in area of the diffraction waveguide, and one beam of the polarized light coupled out from the coupling-out area is directed toward the polarizer, and after reflection, passes through the 1 / 4 wave plate and irradiates the curved reflector, and then is reflected through the 1 / 4 wave plate, the diffraction waveguide and the polarizer to irradiate the windshield before entering the human eye; the other beam is irradiated to the curved reflector through the 1 / 4 wave plate, and then is reflected through the 1 / 4 wave plate, the diffraction waveguide and the polarizer to irradiate the windshield before entering the human eye.
[0008] Further, the polarization state of the out-coupling light in the out-coupling region of the diffractive waveguide is the same as the polarization state of the in-coupling light in the in-coupling region of the diffractive waveguide.
[0009] Furthermore, the optical axis plane of the 1 / 4 wave plate and the polarization direction of the polarized light form an angle of 45°.
[0010] Furthermore, the polarized light in the outcoupling zone of the diffraction waveguide is linearly polarized light, and the linearly polarized light is converted into circularly polarized light by the quarter wave plate.
[0011] Furthermore, the curved reflector can change the handedness of the circularly polarized light.
[0012] Furthermore, the curved reflector is a spherical surface, an aspherical surface, a Zernike polynomial free-form surface, or an extended polynomial free-form surface.
[0013] Furthermore, the polarizer transmits polarized light having a polarization state opposite to the polarized light coupled out of the outcoupling region of the diffraction waveguide.
[0014] Furthermore, the polarizer is a device that uses a PBS prism or a metal wire grid to achieve polarization.
[0015] An optical path system is applied to the above-mentioned augmented reality head-up display device:
[0016] S1: the projection optical machine emits p / s polarized light to the coupling-in region of the diffraction waveguide;
[0017] S2: the p / s polarized light undergoes multiple total reflections in the diffraction waveguide and couples out the p / s polarized light of the same state from the outcoupling region of the diffraction waveguide;
[0018] S3: the p / s polarized light coupled out of the outcoupling zone passes through the 1 / 4 wave plate directly or after being reflected by the polarizer, and the p / s polarized light becomes left-handed / right-handed circularly polarized light and irradiates the curved reflector;
[0019] S4: The left-handed / right-handed circularly polarized light is switched to right-handed / left-handed circularly polarized light at the curved reflector and emitted to the 1 / 4 wave plate;
[0020] S5: the right-handed / left-handed circularly polarized light is converted into s / p state polarized light after passing through the 1 / 4 wave plate;
[0021] S6: the s / p polarized light passes through the polarizer and is irradiated onto the windshield;
[0022] S7: The s / p polarized light on the windshield is reflected and enters the human eye.
[0023] A vehicle comprises the augmented reality head-up display device as described above.
[0024] The present invention uses an external projection optical machine to emit polarized light, and the polarized light is totally reflected inside the diffraction waveguide to achieve pupil expansion, and then the polarized light is coupled out on the upper and lower sides of the diffraction waveguide, thereby achieving efficient use of the polarized light; the present invention places the polarizer on the diffraction waveguide, and places the 1 / 4 wave plate and the curved reflector below the diffraction waveguide, thereby achieving correction of the aberration irradiated to the windshield, and the polarizer can also eliminate crosstalk caused by ambient light; furthermore, the entire optical path system of the present invention reduces the number of the curved reflectors, thereby greatly reducing the volume of the entire augmented reality head-up display device. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of an augmented reality head-up display device according to the present invention.
[0026] Figure 2 This is a schematic diagram of the principle of light emitted from the upper surface of a diffraction waveguide of an augmented reality head-up display device of the present invention.
[0027] Figure 3 This is a schematic diagram of the principle of light emitted from the lower surface of a diffraction waveguide of an augmented reality head-up display device of the present invention.
[0028] Figure 4 This is an xy-direction cross-sectional diagram of ray tracing within the eyebox range of an augmented reality head-up display device according to the present invention.
[0029] Figure 5 This is a cross-sectional diagram in the yz direction of ray tracing within the eyebox range of an augmented reality head-up display device according to the present invention.
[0030] Figure 6 for Figure 5 Schematic diagram of the spatial position of the augmented reality head-up display device shown.
[0031] Figure 7 for Figure 6 Schematic diagram of a curved reflector for an augmented reality head-up display device shown.
[0032] Figure 8 This is a schematic diagram of the optical path of a human eye placed at the eyebox position of an augmented reality head-up display device of the present invention.
[0033] Fig. 9 This is a point arrangement diagram of an augmented reality head-up display device on an 8mm human eye pupil light reverse tracing image plane of the present invention.
[0034] Fig.10 It is the MTF quality of an augmented reality head-up display device of the present invention with a zero field of view on an 8mm human eye pupil ray reverse tracing image plane.
[0035] Fig.11 It is the MTF quality of the diagonal field of view of an augmented reality head-up display device on an 8mm human eye pupil ray reverse tracing image plane of the present invention. DETAILED DESCRIPTION
[0036] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0037] See also Figure 1 and Figure 6 The present invention provides an augmented reality head-up display device, comprising a projection optical machine 1, a diffraction waveguide 2, a polarizer 3, a quarter wave plate 4, a curved reflector 5 and a windshield 6. The polarizer 3, the diffraction waveguide 2, the quarter wave plate 4 and the curved reflector 5 are arranged in sequence from top to bottom, the projection optical machine 1 is arranged at one end of the diffraction waveguide 2, the polarizer 3, the quarter wave plate 4 and the curved reflector 5 are distributed at the other end of the diffraction waveguide 2, and the windshield 6 is arranged obliquely above the polarizer 3.
[0038] The projector light machine 1 emits a light source for generating an image. Among them, the image light source can be DLP, LCOS, LCD or MINILED, MICROLED, but is not limited to these light sources. In this embodiment, the output light of the projector light machine 1 is polarized light, that is, the light source emitted by the projector light machine 1 itself is polarized light. In other cases, the display light source of the projector light machine is non-polarized light, and the output light is polarized by using a polarizing plate or PBS prism, a metal wire grid, etc. in the projector light machine 1. This embodiment is not limited to the above-mentioned method for realizing polarization. Furthermore, the exit pupil of the projector light machine 1 is externally placed to facilitate the matching of the next step of pupil expansion.
[0039] The diffraction waveguide 2 includes an incoupling region 201 and an outcoupling region 202. The projection optical engine 1 is disposed at one end of the incoupling region 201 of the diffraction waveguide 2. The polarizer 3, the quarter wave plate 4 and the curved reflector 5 are distributed at one end of the outcoupling region 202 of the diffraction waveguide 2.
[0040] Furthermore, the exit pupil of the projection optical machine 1 coincides with the coupling-in area 201 of the diffraction waveguide 2, so as to facilitate coupling the light of the projection optical machine 1 into the diffraction waveguide 2. After the coupling-in light entering the coupling-in area 201 of the diffraction waveguide 2 undergoes multiple total reflections in the diffraction waveguide 2, it couples out of the diffraction waveguide 2 in the coupling-out area 202 of the diffraction waveguide 2. Among them, coupling-out light is emitted from both the upper and lower surfaces of the diffraction waveguide 2. And the polarization state of the coupling-out light emitted from the upper and lower surfaces of the coupling-out area 202 of the diffraction waveguide 2 is the same as the polarization state of the coupling-in light in the coupling-in area of the diffraction waveguide. More specifically, if the polarization state of the light emitted from the projection light machine 1 is p-state, then the polarization state of the outcoupled light on the upper and lower surfaces of the outcoupled area 202 of the diffraction waveguide 2 is also p-state; conversely, if the polarization state of the light emitted from the projection light machine 1 is s-state, then the polarization state of the outcoupled light on the upper and lower surfaces of the outcoupled area 202 of the diffraction waveguide 2 is also s-state.
[0041] In this embodiment, the polarizer 3 can transmit polarized light of the opposite polarization state to the polarized light coupled out of the outcoupling region 202 of the diffraction waveguide 2, while the polarized light after pupil expansion emitted from the diffraction waveguide 2 cannot pass through the polarizer 3, and these lights are reflected and absorbed by the polarizer 3, while the polarized light reflected by the polarizer 3 further passes through the diffraction waveguide 2. More specifically, the polarizer 3 is not limited to a polarizer, and a device for realizing polarization, such as a PBS prism and a metal wire grid, can also be used.
[0042] Furthermore, the ambient sunlight can be absorbed or reflected by the polarizer 3. The polarizer 3 can absorb polarized light of the polarization state that cannot pass through. The light of the polarization state that can pass through is converted into a polarization state in a vertical direction by the 1 / 4 wave plate 4 and cannot be transmitted from the polarizer 3 again. This part of the light can be consumed well.
[0043] Among them, reflective polarizers, such as polarization devices such as metal wire grids, can adjust and fine-tune the angle of the augmented reality head-up display device so that the reflected ambient sunlight does not enter the human eye observation area.
[0044] Therefore, the use of the polarizer 3 can effectively eliminate the visual crosstalk problem caused by ambient sunlight.
[0045] In this embodiment, the optical axis plane of the 1 / 4 wave plate 4 and the polarization direction of the polarized light form an angle of 45°. The p-state or s-state polarized light coupled out of the outcoupling region 202 of the diffraction waveguide 2 is linearly polarized light, and the linearly polarized light becomes circularly polarized light after passing through the 1 / 4 wave plate 4. More specifically, when the polarized light is p-state linearly polarized light, it becomes left-handed circularly polarized light after passing through the 1 / 4 wave plate; when the polarized light is s-state linearly polarized light, it becomes right-handed circularly polarized light after passing through the 1 / 4 wave plate.
[0046] In other embodiments, the angle between the optical axis plane of the 1 / 4 wave plate 4 and the polarization direction of the polarized light is not 45°. In this case, the linearly polarized light will become elliptically polarized light after passing through the 1 / 4 wave plate 4.
[0047] See also Figure 7 , the function of the curved reflector 5 is to change the rotation direction of circularly polarized light. When the light before the incident is left-handed circularly polarized light, after passing through the curved reflector, the outgoing light becomes right-handed circularly polarized light; when the light before the incident is right-handed circularly polarized light, after passing through the curved reflector, the outgoing light becomes left-handed polarized light. The curved reflector 5 is a spherical surface, an aspherical surface, a Zernike polynomial free-form surface, an extended polynomial free-form surface, etc., but is not limited to these surface types. The extended polynomial free-form surface equation is:
[0048]
[0049] Among them, see Figure 2 and Figure 3 The projection optical machine 1 emits polarized light to the coupling-in area 201 of the diffraction waveguide 2, and one beam of the polarized light coupled out of the coupling-out area 202 is directed toward the polarizer 3, and then passes through the 1 / 4 wave plate 4 and irradiates the curved reflector 5 after being reflected, and then passes through the 1 / 4 wave plate 4, the diffraction waveguide 2 and the polarizer 3 to irradiate the windshield 6 and then reflects into the human eye; another beam of the polarized light coupled out of the coupling-out area 202 is irradiated to the curved reflector 5 through the 1 / 4 wave plate 4, and then passes through the 1 / 4 wave plate 4, the diffraction waveguide 2 and the polarizer 3 to irradiate the windshield and then enter the human eye.
[0050] Since the outcoupled light from the upper and lower sides of the diffraction waveguide 2 eventually enters the human eye after being reflected by the windshield 6, not only the light energy is fully utilized and the light energy utilization rate is improved, but also the power consumption of the optical machine is reduced.
[0051] In this embodiment, the verification is performed using conditions such as a human eye pupil of 8 mm, an eyebox size of 130*50 mm, a curved reflector size of 300*200 mm, and a field of view of 13*8°.
[0052] See also Figure 4, showing the xy cross-section of the ray tracing within the entire eyebox.
[0053] See also Figure 5 , showing the yz direction cross-section of the ray tracing within the entire eyebox range.
[0054] See also Figure 8 , shows a schematic diagram of the light path of a human eye placed at the eyebox position. The human eye can move freely in the entire eyebox area, and the light trajectory diagram at a pupil of 8mm.
[0055] See also Fig. 9 The above experimental results show the spot diagram on the image plane of the 8mm light tracing of the pupil of the human eye. It can be seen from the spot diagram that the size of the spot diagram under different fields of view is smaller than the size of the display image source. The display image source size is larger than 5um, and the maximum point diagram RMS size is 3.7um. The single pixel of the display image source can be well distinguished, that is, the image clarity when observed by the human eye is not limited by the image quality.
[0056] See also Fig.10 The above experimental results show the MTF quality of 8mm light tracing on the image plane with 0 field of view, showing that the image source size is greater than 5um, corresponding to 100lp / mm. From the MTF image quality, it can be seen that the MTF is 0.6 at 100lp / mm, which can well distinguish the single pixel of the display image source.
[0057] See also Fig.11 The above experimental results show the MTF quality of the diagonal field of view on the image plane of the 8mm light tracing of the pupil of the human eye. The image source size is greater than 5um, corresponding to 100lp / mm. From the MTF image quality, it can be seen that the MTF is 0.4 at 100lp / mm, which can well distinguish the single pixel of the display image source.
[0058] From the experimental results of imaging, the present invention effectively controls the degradation and distortion of image quality by correcting the aberration of polarized light irradiating the windshield 6, making the image clearer, so that there will be no blurry images or even visual dizziness.
[0059] See also Figure 2 and Figure 3 The present invention also provides an optical path system,
[0060] When the output light of the projection optical machine 1 is p-state polarized light, the optical path is as follows:
[0061] S1: the projection optical machine 1 emits p-state polarized light to the coupling-in region 201 of the diffraction waveguide 2;
[0062] S2: the p-state polarized light undergoes multiple total reflections in the diffraction waveguide 2 and couples out the p-state polarized light of the same state from the outcoupling region 202 of the diffraction waveguide 2;
[0063] S3: the p-state polarized light coupled out of the coupling-out region 202 passes through the quarter wave plate 4 directly or after being reflected by the polarizer 3, and the p-state polarized light becomes left-handed circularly polarized light and irradiates the curved reflector 5;
[0064] S4: the left-handed circularly polarized light is switched to right-handed circularly polarized light at the curved reflector 5 and emitted to the quarter wave plate 4;
[0065] S5: the right-handed circularly polarized light becomes s-state polarized light after passing through the quarter wave plate 4;
[0066] S6: the s-state polarized light passes through the polarizer 3 and is irradiated onto the windshield 6;
[0067] S7: The s-polarized light on the windshield 6 is reflected and enters the human eye.
[0068] In another case, when the output light of the projection optical machine 1 is s-state polarized light, the optical path is as follows:
[0069] S1: the projection optical machine 1 emits s-state polarized light to the coupling-in region 201 of the diffraction waveguide 2;
[0070] S2: the s-state polarized light undergoes multiple total reflections in the diffraction waveguide 2 and couples out the s-state polarized light of the same state from the outcoupling region 202 of the diffraction waveguide 2;
[0071] S3: the s-state polarized light coupled out of the coupling-out region 202 passes through the 1 / 4 wave plate 4 directly or after being reflected by the polarizer 3, and the s-state polarized light becomes right-handed circularly polarized light and irradiates the curved reflector 5;
[0072] S4: the right-handed circularly polarized light is switched to left-handed circularly polarized light at the curved reflector 5 and emitted to the quarter wave plate 4;
[0073] S5: the left-handed circularly polarized light becomes p-state polarized light after passing through the quarter wave plate 4;
[0074] S6: the p-state polarized light passes through the polarizer 3 and is irradiated onto the windshield 6;
[0075] S7: The p-state polarized light on the windshield 6 is reflected and enters the human eye.
[0076] The present invention also provides a vehicle, including the augmented reality head-up display device as shown above, forming a virtual image in front of the windshield 6. The vehicle can be a car, an electric car, etc., for example, a pure electric car, an extended-range electric car, a hybrid electric car, a fuel cell car, a new energy car, etc., without specific limitation.
[0077] The present invention uses the external projection optical machine 1 to emit polarized light, and the polarized light is totally reflected in the diffraction waveguide 2 to achieve pupil expansion, and then the polarized light is coupled out on the upper and lower sides of the diffraction waveguide 2, thereby achieving efficient use of the polarized light; the present invention adopts the method of placing the polarizer 3 on the diffraction waveguide 2, and placing the 1 / 4 wave plate 4 and the curved reflector 5 below the diffraction waveguide 2, thereby achieving correction of the aberration irradiated to the windshield 6, and the polarizer 3 can also eliminate the crosstalk caused by ambient light; furthermore, the entire optical path system of the present invention reduces the number of the curved reflectors 5, thereby greatly reducing the volume of the entire augmented reality head-up display device.
[0078] In the accompanying drawings, the sizes and relative sizes of layers and regions are exaggerated for clarity. It should be understood that when an element, such as a layer, region, or substrate, is referred to as being "formed on," "disposed on," or "located on" another element, the element may be disposed directly on the other element, or there may be intervening elements. Conversely, when an element is referred to as being "formed directly on" or "disposed directly on" another element, there are no intervening elements.
[0079] In this document, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0080] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description, and therefore should not be understood as limitations on this application.
[0081] In this document, the ordinal adjectives “first”, “second”, etc. used to describe elements are only used to distinguish elements with similar attributes, and do not mean that the elements described in this way must follow a given order, or time, space, level or other limitations.
[0082] As used herein, unless otherwise specified, “plurality” or “several” means two or more.
[0083] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.
[0084] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. An augmented reality head-up display device, characterized in that: The invention comprises a projection optical machine, a diffraction waveguide, a polarizer, a quarter wave plate, a curved reflector and a windshield, wherein the diffraction waveguide comprises a coupling-in region and a coupling-out region, the projection optical machine is arranged at one end of the coupling-in region of the diffraction waveguide, the polarizer, the diffraction waveguide, the quarter wave plate and the curved reflector are arranged in sequence from top to bottom, and the polarizer, the quarter wave plate and the curved reflector are distributed at one end of the coupling-out region of the diffraction waveguide, and the windshield is arranged obliquely above the polarizer.
2. The augmented reality head-up display device according to claim 1, characterized in that: The projection optical machine emits polarized light to the coupling-in area of the diffraction waveguide, and one beam of the polarized light coupled out of the coupling-out area is directed toward the polarizer, and after being reflected, passes through the 1 / 4 wave plate and irradiates the curved reflector, and then is reflected through the 1 / 4 wave plate, the diffraction waveguide and the polarizer to irradiate the windshield before entering the human eye; the other beam of polarized light is irradiated to the curved reflector through the 1 / 4 wave plate, and then is reflected through the 1 / 4 wave plate, the diffraction waveguide and the polarizer to irradiate the windshield before entering the human eye.
3. The augmented reality head-up display device according to claim 1, characterized in that: The polarization state of the out-coupled light in the out-coupling region of the diffractive waveguide is the same as the polarization state of the in-coupled light in the in-coupling region of the diffractive waveguide.
4. The augmented reality head-up display device according to claim 2, characterized in that: The optical axis plane of the 1 / 4 wave plate and the polarization direction of the polarized light form an angle of 45°.
5. The augmented reality head-up display device according to claim 4, characterized in that: The polarized light in the outcoupling zone of the diffraction waveguide is linearly polarized light, and the linearly polarized light is converted into circularly polarized light by the 1 / 4 wave plate.
6. The augmented reality head-up display device according to claim 5, characterized in that: The curved reflector changes the handedness of circularly polarized light.
7. The augmented reality head-up display device according to claim 6, characterized in that: The curved reflector is a spherical surface, an aspherical surface, a Zernike polynomial free-form surface, or an extended polynomial free-form surface.
8. The augmented reality head-up display device according to claim 2, characterized in that: The polarizer transmits polarized light having a polarization state opposite to the polarized light coupled out of the outcoupling region of the diffraction waveguide.
9. The augmented reality head-up display device according to claim 8, characterized in that: The polarizer is a device that uses a PBS prism and a metal wire grid to achieve polarization.
10. An optical path system, applied to the augmented reality head-up display device according to any one of claims 1 to 8, characterized in that: S1: the projection optical machine emits p / s polarized light to the coupling-in region of the diffraction waveguide; S2: the p / s polarized light undergoes multiple total reflections in the diffraction waveguide and couples out the p / s polarized light of the same state from the outcoupling region of the diffraction waveguide; S3: the p / s polarized light coupled out of the outcoupling zone passes through the 1 / 4 wave plate directly or after being reflected by the polarizer, and the p / s polarized light becomes left-handed / right-handed circularly polarized light and irradiates the curved reflector; S4: The left-handed / right-handed circularly polarized light is switched to right-handed / left-handed circularly polarized light at the curved reflector and emitted to the 1 / 4 wave plate; S5: the right-handed / left-handed circularly polarized light is converted into s / p state polarized light after passing through the 1 / 4 wave plate; S6: the s / p polarized light passes through the polarizer and is irradiated onto the windshield; S7: The s / p polarized light on the windshield is reflected and enters the human eye.
11. A vehicle, characterized in that: It comprises an augmented reality head-up display device as described in any one of claims 1 to 8.