Head-up display device and vehicle comprising same

Abstract

The invention provides a head-up display device and a vehicle comprising the same, the head-up display device comprises an imaging unit, a reflector and a windshield of the vehicle, the windshield comprises a reflection area and a transmission area, the imaging unit forms a first light ray and emits the first light ray to the reflection area, the reflection area reflects the first light ray to form a second light ray, and the second light ray is emitted to the transmission area. The reflecting area reflects the second light to the reflecting mirror, the reflecting mirror reflects the second light to form third light, the reflecting mirror reflects the third light to the transmission area to form fourth light, the transmission area reflects the fourth light to the human eyes, and the fourth light forms a virtual image on the other side, opposite to the human eyes, of the windshield. According to the head-up display device provided by the invention, the volume of the light path can be compressed through multiplexing the light path and multiplexing the windshield reflection, and the volume of the head-up display device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and in particular to a head-up display device and a vehicle including the head-up display device. Background Art

[0002] Head-up display (HUD) devices are an important part of smart cars that are being vigorously developed both internationally and domestically. Through the promotion and application of head-up display devices by major automobile brands in the early stage, more and more car manufacturers and users have realized the importance of head-up display device technology for safe driving, enabling drivers to obtain important information such as vehicle speed, navigation, road conditions and vehicle distance without taking their eyes off the road. Its unique display position cannot be replaced by display devices in other positions on the car, so more and more car manufacturers are installing head-up display devices on new models as a priority configuration to improve driving safety.

[0003] The head-up display industry currently has an industry pain point problem, that is, consumers want the HUD display screen to be as large as possible. However, due to the limitations of the geometric optical principles used by the current traditional HUD, a certain optical path is required to obtain a larger display screen, and two or more reflective lenses must be used in the design. The current reflective lenses, in order to obtain high reflectivity, need to be coated with a full reflection film on the glass surface, so the transmittance is very low, so the reflective lenses must be arranged outside the optical path, occupying an additional part of the independent space, and each optical path is independent of each other, so the size of the entire HUD product increases accordingly. However, the structural space under the car dashboard is limited, and the larger HUD machine volume is easy to interfere with the sheet metal panel of the car dashboard, the air conditioning defrost outlet for the front windshield, the mounting bracket, etc., and cannot be arranged.

[0004] Therefore, it is of great practical significance to develop a more compact optical path spatial multiplexing HUD optical path structure. Summary of the invention

[0005] The main purpose of this application is to provide a spatially multiplexed HUD imaging optical path structure, which aims to reduce the number of reflectors and the volume of the optical path space under the premise of the same screen size through optical path spatial multiplexing technology, thereby reducing the overall volume of the HUD and saving space.

[0006] To achieve the above objectives, the present application provides the following technical solutions:

[0007] A head-up display device comprises: an imaging unit, a reflector and a windshield of a vehicle, wherein the windshield comprises a reflection area and a transmission area, wherein the imaging unit forms a first light ray and directs the first light ray toward the reflection area, wherein the reflection area reflects the first light ray to form a second light ray, wherein the reflection area reflects the second light ray to the reflector, wherein the reflector reflects the second light ray to form a third light ray, wherein the reflector reflects the third light ray to the transmission area to form a fourth light ray, wherein the transmission area reflects the fourth light ray to a human eye, wherein the fourth light ray forms a virtual image on the other side of the windshield relative to the human eye.

[0008] Based on the same application concept, an embodiment of the present application also provides a means of transportation, including the above-mentioned head-up display device.

[0009] Compared with the prior art, the imaging optical path structure of the head-up display device based on the spatial reuse of the automobile windshield of the present application has the following beneficial effects: the present application, through the above technical solution, includes a generation unit, a reflector and a windshield, the windshield includes a transmission area and a reflection area, the reflection area is located in the optical path between the imaging unit and the reflector, the imaging light beam emitted from the image generation unit is directed to the reflection area, and then reflected to the reflector, and then reflected to the transmission area of ​​the windshield, and finally converged at the driver's eye position to realize the display function. Through the above design, the present application realizes that under the same HUD imaging field of view (FOV), it can be realized with a smaller product volume and arranged on more vehicle models, thereby solving the contradiction between large screen and small volume in the HUD industry and solving a major pain point in the industry; the use of the present application solution can also achieve a larger display screen with a similar product volume, which can bring a larger FOV, so that the ARHUD screen is wider and higher, and can cover more and farther lanes. When there are dangerous factors in vehicle driving, it can be projected on the ARHUD earlier, and the driver can get an early warning earlier, thereby improving the safety of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0011] Figure 1 It is a schematic diagram of a head-up display device provided by the prior art;

[0012] Figure 2 The present application embodiment provides a schematic diagram of a head-up display device;

[0013] Figure 3 The embodiment of the present application provides a schematic diagram of an imaging unit;

[0014] Figure 4 is a schematic diagram of a windshield provided in an embodiment of the present application;

[0015] Figure 5 is a schematic diagram of another windshield provided in an embodiment of the present application;

[0016] Figure 6 This is a schematic diagram of a quarter glass slide provided in an embodiment of the present application;

[0017] Figure 7 is a schematic diagram of another head-up display device provided in an embodiment of the present application;

[0018] Figure 8 is a schematic diagram of another head-up display device provided in an embodiment of the present application;

[0019] Fig. 9 is a schematic diagram of another head-up display device provided in an embodiment of the present application;

[0020] Fig.10 is a schematic diagram of a height adjustment structure provided in an embodiment of the present application;

[0021] Fig.11 It is a schematic diagram of a means of transportation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 are within the scope of protection of this application.

[0023] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] At present, the design of HUD imaging systems on the market mostly adopts a zigzag optical path, such as Figure 1 As shown, Figure 1 This is a schematic diagram of a head-up display device provided by the prior art. The head-up display device adopts a traditional solution including at least two reflectors, and the reflector lenses are opaque and must be set separately from the main light path, requiring an additional independent space, so that the whole device occupies a relatively large space. Figure 1 In the prior art, a head-up display device 100' includes an imaging unit 200', a first reflector M1, a second reflector M2 and a windshield 300'. The imaging unit 200' is arranged inside the car dashboard, and the emitted light is directed toward the first reflector M1. The first reflector M1 is arranged on the imaging unit 200', close to the driver (human eye 400'), receives the light emitted from the imaging unit 200', and reflects the received light toward the second reflector M2. The first reflector M1 is a plane reflector or a free-form surface mirror. The second reflector M2 is arranged on the side of the first reflector M1 away from the driver (human eye 400). The second reflector M2 is a free-form surface mirror, receives the light reflected from the first reflector M1, and reflects the light to the windshield 300'. After being reflected by the windshield 300', the light is emitted to the vicinity of the driver (human eye 400'), and forms a virtual image on the side of the windshield 300' away from the driver (human eye 400'), thereby realizing a head-up display. In the prior art, the entire optical path is imaging unit 200'→first reflector M1→second reflector M2→windshield 300'→driver (human eye 400'), and the entire optical path is independent of each other. To obtain a large-sized virtual image, it is necessary to expand the light-emitting area of ​​the imaging unit 200' or the reflection area of ​​the first reflector M1 and the second reflector M2 in the entire optical path. However, the light-emitting area of ​​the imaging unit 200' or the reflection area of ​​the first reflector M1 and the second reflector M2 is limited by the space of the vehicle head-up display device 100' and is difficult to increase at will.

[0026] This application proposes a head-up display device imaging optical path structure based on the spatial reuse of the automobile windshield. The technical solution adopted by the head-up display device imaging optical path structure based on the spatial reuse of the automobile windshield in this application is mainly to set a reflection area on the lower side of the windshield to replace the reflector, and reuse the optical paths between the various components of the head-up display device, which can compress the optical path space to the maximum extent, thereby further saving the occupied space of the head-up display device.

[0027] Specifically, Figure 2 The present application embodiment provides a schematic diagram of a head-up display device, such as Figure 2 As shown, the head-up display device 100 includes an imaging unit 200, a reflector M and a windshield 300 of a vehicle, the windshield 300 includes a reflection area R and a transmission area T, the imaging unit 200 forms a first light ray L1, and emits the first light ray L1 to the reflection area R, the reflection area R reflects the first light ray L1 to form a second light ray L2, the reflector M receives the second light ray L2 and reflects it to form a third light ray L3, the reflector M reflects the third light ray L3 to the transmission area T, and after reflection by the transmission area T, forms a fourth light ray L4, and the fourth light ray L4 forms a virtual image X on the other side of the windshield 300 relative to the human eye 400.

[0028] In this embodiment, by providing a reflection area R on the windshield and reusing the reflection area R of the windshield 300 for reflection, the number of reflectors in the head-up display device 100 can be reduced, and thus the volume of the head-up display device 100 can be reduced.

[0029] In the embodiment of the present application, the imaging unit 200 refers to a graphic generation unit that can convert an electrical signal into an optical signal. As a non-limiting example, the imaging unit 200 optionally includes a display device that can emit image light, or a real image or virtual image formed by these display devices through refraction, reflection, etc. For example, the imaging unit 200 can be a liquid crystal display, or an active light-emitting dot matrix screen composed of light source points such as LED (Light-Emitting Diode), OLED (Organic Light-Emitting Diode), and plasma light-emitting points; it can also be based on projection technologies such as DLP (Digital Light Procession), LCOS (Liguid Crystalon Silicon), liquid crystal, etc., driven by light sources such as LED, OLED, laser, fluorescent light or a combination thereof, reflected or transmitted by display panels such as DMD (Digital Micromirror Device), LCOS, LCD, and then projected on the projection screen through a projection lens to form an image; it can also be a projection imaging device that scans a laser beam on the screen to form an image; and the real image or virtual image formed by one or more refractions or reflections of all the above display devices can also be used as the imaging unit 200.

[0030] Optionally, in some embodiments, the imaging unit 200 is a liquid crystal display, such as Figure 3 As shown, the liquid crystal display includes an upper polarizer P2 and a lower polarizer P1 located on the upper and lower sides of a liquid crystal box B. The upper polarizer P2 and the lower polarizer P1 modulate the light emitted by a backlight unit L below the liquid crystal box B into linear polarized light, wherein the absorption axes of the upper polarizer P2 and the lower polarizer P1 are perpendicular.

[0031] Optionally, in some embodiments, Figure 2 As shown, the first light ray L1 and the third light ray L3 intersect, and the imaging light path of the head-up display device 100 is changed from a traditional "Z"-shaped light path to a "△"-shaped light path, which is more conducive to light path folding and has a compact light path structure, thereby reducing the volume of the light path space and thus reducing the volume of the head-up display device 100; on the other hand, in the embodiment of the present application, there is only one reflector M, which reduces one reflector compared to the traditional imaging light path, and can save the volume occupied by the reflector, thereby further reducing the volume of the head-up display device 100.

[0032] Alternatively, in other embodiments, such as Figure 2As shown, the head-up display device also includes an instrument panel 500, which is provided with an opening W. The imaging unit 200, the reflector M and the reflection area R of the windshield 300 are all arranged inside the instrument panel 500. The third light ray L3 is projected to the transmission area T through the opening M. In the embodiment of the present application, the imaging unit 200, the reflector M and the reflection area R are all arranged inside the instrument panel 500 to prevent interference from external light. The third light ray L3 is projected to the outside of the instrument panel 500 through the opening W, and forms a virtual image X after being reflected by the transmission area T of the windshield 300.

[0033] In this embodiment, the reflector M may be a curved reflector, and specifically, the curved reflector may be a concave reflector, and the surface of the concave reflector facing the opening W of the instrument panel 500 is a concave curved surface, and the image light will be reflected and gathered after passing through the concave reflector. According to the imaging principle of the head-up display device, the image light emitted by the image imaging unit 200 changes the propagation direction after being reflected by the reflection area R of the windshield 300, and then emitted to the curved reflector M, and the reflected image light is emitted to the outside of the instrument panel 500 through the opening W of the instrument panel 500, and forms a virtual image after being reflected by the external reflective medium (such as the reflective imaging part). The external reflective medium generally includes the windshield 300 of the vehicle or the added transparent material imaging window, which is generally a plane surface shape, or a curved surface shape close to a plane; therefore, the reflection of the light on the windshield 300 is close to mirror reflection, that is, the external reflective medium has little effect on the imaging distance, and the imaging distance of the head-up display device is mainly determined by the curved reflector M. In the case where the curved reflector is a concave reflector (i.e., a reflector whose reflective surface is a concave curved surface), if the distance between the imaging unit 200 and the concave reflector is less than the focal length of the concave reflector, the concave reflector forms an upright and enlarged virtual image based on the image output by the imaging unit 200. For example, according to the imaging properties of the concave reflector, when the optical distance between the imaging unit 200 and the concave reflector is less than the focal length of the concave reflector (i.e., the image display unit is located within one focal length of the concave reflector), the image distance of the concave reflector increases as the distance between the imaging unit 200 and the concave reflector increases, that is, the greater the distance between the imaging unit 200 and the concave reflector, the greater the imaging distance of the head-up display device. Therefore, the imaging distance of the virtual image finally formed by different display areas can be adjusted by adjusting the distance between different display areas and the curved reflective element.

[0034] Optionally, in some embodiments, Figure 2As shown, the reflection area R of the windshield 300 is arranged on the lower side of the windshield 300, and the reflection area R is provided with a reflection film layer 600. Specifically, the reflection film layer 600 is arranged on the inner side of the windshield 300, that is, the side close to the human eye 400, which can avoid damage from external forces. For example, repeated scraping of the wiper can easily cause the reflection film layer 600 to fall off or be damaged from the windshield 300.

[0035] Optionally, in some embodiments, Figure 4 As shown, Figure 4 3 is a schematic diagram of a windshield 300 provided by the present application. The windshield 300 is a laminated glass, including a first glass plate 300A and a second glass plate 300B. The first glass plate 300A is located on a side close to the human eye, and the second glass plate 300B is located on a side away from the human eye. It also includes a reflective film layer 600, which is arranged between the first glass plate 300A and the second glass plate 300B to prevent the reflective film layer 600 from being damaged by external forces. For example, in addition to preventing the reflective scraping of the wiper from damaging the reflective film layer 600, it can also prevent the reflective film layer 600 from being damaged during the installation process of the windshield 300.

[0036] Optionally, in some embodiments, Figure 5 As shown, Figure 5 is a schematic diagram of another windshield 300 provided by the present application, the windshield 300 comprises a first glass plate 300A, a second glass plate 300B and a wedge film 700 sandwiched between the first glass plate 300A and the second glass plate 300B, the material of the wedge film 700 is usually polyvinyl butyral (PVB), which is used to bond and fix the first glass plate 300A and the second glass plate 300B together. It can be understood that the material of the wedge film 700 in the embodiment of the present application is not limited thereto, and polycarbonate (PC), polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyacrylate (PA), polymethyl methacrylate (PMMA) or polyurethane (PUR) can also be selected. The wedge film 700 has a first surface 700A and a second surface 700B opposite to each other. The first surface 700A faces the first glass plate 300A, and the second surface 700B faces the second glass plate 300B. The reflective film layer 600 is disposed between the first glass plate 300A and the first surface 700A of the wedge film 700 (not shown in the figure). In some embodiments, the reflective film layer 600 may be disposed between the second glass plate 300B and the second surface 700B of the wedge film 700 (not shown in the figure).

[0037] In some embodiments, the reflective film layer 600 may be a coating film, a transfer film, a silk-screen film, a sputtering film, or a vapor-deposited film. Alternatively, the reflective film layer 600 may be formed by printing a black ink. Printing methods include rod coating, reverse coating, gravure coating, die coating, roller coating, and silk-screen printing. However, silk-screen printing is preferred because it can be printed on various substrates in a simple manner and can be printed according to the size of the windshield 300.

[0038] In other embodiments, the reflective film layer 600 may also be formed of a metal reflective film or an organic reflective film. Specifically, the reflective film layer 600 may be a metal reflective film made of any metal such as gold, silver, or copper, or may be a combination of one or more materials such as aluminum, silver, aluminum alloy, or silver alloy, or may be made of an organic light reflective film such as a polyethylene terephthalate plastic film (PET film).

[0039] Figure 6 is a schematic diagram of a quarter glass slide provided in an embodiment of the present application, such as Figure 6 As shown, in this embodiment, the quarter glass slide 800 has different refractive indices (that is, different propagation speeds) for incident light with different polarization directions. The quarter glass slide 800 controls the material and thickness so that after the light passes through the quarter glass slide, the two lights with different polarization directions produce a phase difference of one-quarter wavelength, and the synthesized light under this phase difference is circularly polarized light. The fast axis of the quarter glass slide 800 is at an angle of 45° with the polarization direction of the incident light beam (P light), and the imaging light beam is modulated into right-handed polarized light. The right-handed circularly polarized light is modulated into linearly polarized light (S light) after reflection and passing through the quarter glass slide again; or the fast axis of the quarter glass slide 800 is at an angle of 45° with the polarization direction of the incident light beam (S light), and the imaging light beam is modulated into left-handed polarized light. The left-handed circularly polarized light is modulated into linearly polarized light (P light) after reflection and passing through the quarter glass slide again (not shown in the figure). Therefore, the polarized light of the first light L1 and the third light L3 can have different polarization directions, so that the two light beams in the same space can be composited and utilized without interfering with each other, thereby compressing the optical path space of the head-up display device 100 and making the structure of the head-up display device more compact.

[0040] Optionally, in some embodiments, the reflection region R is provided with a quarter glass slide 800. Figure 7 is a schematic diagram of another head-up display device 100 provided in an embodiment of the present application, such as Figure 7As shown, the first light ray L1 emitted by the imaging unit 200 is emitted toward the reflection area R, passes through the quarter glass slide 800 and reaches the surface of the reflection area R, and is reflected by the reflection area R to form the second light ray L2. The second light ray L2 passes through the quarter glass slide 800 again and is reflected and emitted toward the reflector M, and is reflected by the reflector M to form the third light ray L3. The third light ray L3 is emitted toward the transmission area T of the windshield 300, and is finally reflected by the windshield 300 to form the fourth light ray L4 that converges near the position of the driver's eyes 400, thereby realizing the display function.

[0041] The specific working principle adopted in this embodiment is: the imaging beam of the first light L1 emitted by the imaging unit 200 can be a linearly polarized light S light with a specific polarization direction, which passes through the quarter glass slide 800. After being modulated by the quarter glass slide 800, the azimuth of the vibration plane of the first light L1 polarized in the S direction rotates 45° to become left-handed circularly polarized light. After the first light L1 becomes left-handed circularly polarized light, it is emitted to the reflection area R. The reflection area R faces the side of the imaging unit 200 with a reflection film layer 600 with a reflection function. After the first light L1 is reflected by the reflection film layer 600, it forms a second light L2. The second light L2 is also left-handed circularly polarized light. The reflection film layer 600 The second light L2 containing left-handed circularly polarized light is reflected toward the reflector M. The second light L2 passes through the quarter glass 800 again. After being modulated by the quarter glass 800, the vibration plane of the second light L2 containing left-handed circularly polarized light is rotated by 45° again to become P-direction polarized light. The second light L2 polarized in the P direction then reaches the surface of the reflector M. After being reflected by the reflector M, a third light L3 polarized in the P direction is formed. The third light L3 is reflected toward the transmission area T of the windshield 300. After being reflected by the transmission area T of the windshield 300, a fourth light L4 is formed. Finally, the fourth light L4 is focused near the human eye 400 in the form of P-direction linearly polarized light to form an image.

[0042] Alternatively, the imaging beam of the first light L1 emitted by the imaging unit 200 can be a linearly polarized light P light with a specific polarization direction. After passing through the quarter glass slide 800, after being modulated by the quarter glass slide 800, the azimuth of the vibration plane of the first light L1 polarized in the P direction is rotated by 45° to become right-handed circularly polarized light. After the first light L1 becomes right-handed circularly polarized light, it is emitted to the reflection area R. The reflection area R faces a side of the imaging unit 200 with a reflection film layer 600 having a reflection function. After the first light L1 is reflected by the reflection film layer 600, it forms a second light L2. The second light L2 is also right-handed circularly polarized light. The reflection film layer 600 modulates the right-handed circularly polarized light. The second light L2 of the right circularly polarized light is reflected toward the reflector M, and the second light L2 passes through the quarter glass 800 again. After being modulated by the quarter glass 800, the azimuth of the vibration plane of the second light L2 of right circularly polarized light is rotated by 45° again to become S-polarized light. The second light L2 of S-polarized light then reaches the surface of the reflector M, and after being reflected by the reflector M, forms a third light L3 of which the polarization direction is also S-direction. The third light L3 is reflected toward the transmission area T of the windshield 300, and after being reflected by the transmission area T of the windshield 300, forms a fourth light L4. Finally, the fourth light L4 is focused near the human eye 400 in the form of S-linearly polarized light to form an image.

[0043] Since the reflective area R with the quarter glass slide 800 attached or plated thereon can change the polarization direction of light, the polarized light of the first light beam L1 and the third light beam L3 can have different polarization directions, so that the two light beams in the same space can be composited and utilized without interfering with each other, thereby compressing the optical path space of the head-up display device 100 and making the structure of the head-up display device more compact.

[0044] Optionally, in some embodiments, the reflector M is provided with a quarter glass slide 800, Figure 8 is a schematic diagram of another head-up display device 100 provided in an embodiment of the present application, such as Figure 8 As shown, the first light ray L1 emitted by the imaging unit 200 is emitted toward the reflection area R, and the first light ray L1 is reflected by the reflection area R to form the second light ray L2, and then reflected toward the reflector M, and reaches the surface of the reflector M after passing through the quarter glass slide 800, and then is reflected by the reflector M to form the third light ray L3, and the third light ray L3 passes through the quarter glass slide 800 again and is emitted toward the transmission area T of the windshield 300, and finally is reflected by the windshield 300 to form the fourth light ray L4 that converges near the position of the driver's eyes 400, thereby realizing the display function.

[0045] The specific working principle adopted in this embodiment is: the imaging beam of the first light L1 emitted by the imaging unit 200 is a linearly polarized light S light with a specific polarization direction. The first light L1 is emitted to the reflection area R. The reflection area R faces the side of the imaging unit 200 with a reflection film layer 600 with a reflection function. After being reflected by the reflection film layer 600, the second light L2 is formed. The second light L2 is also S-direction linearly polarized light. After passing through the quarter glass slide 800 and being modulated by the quarter glass slide 800, the azimuth of the vibration plane of the second light L2 of the S-direction polarized light is rotated by 45° to become left-handed circularly polarized light. The second light L2 is converted into left-handed circularly polarized light and then emitted to the surface of the reflector M. After being reflected by the reflector M, the third light L3 is formed, which is also left-handed circularly polarized light. The third light L3 passes through the quarter glass 800 again. After being modulated by the quarter glass 800, the azimuth of the vibration plane of the left-handed circularly polarized light is rotated by 45° again to become P-polarized light. The third light L3 with P-polarized light is emitted to the transmission area T of the windshield 300. After being reflected by the transmission area T of the windshield 300, the fourth light L4 is formed. Finally, the fourth light L4 is gathered near the human eye 400 in the form of linearly polarized light P light to form an image.

[0046] Alternatively, the imaging beam of the first light L1 emitted by the imaging unit 200 is a linearly polarized light P light with a specific polarization direction. The first light L1 is emitted toward the reflection area R. The reflection area R faces a reflection film layer 600 with a reflection function on one side of the imaging unit 200. After being reflected by the reflection film layer 600, a second light L2 is formed. The second light L2 is also a linearly polarized light in the P direction. After passing through the quarter glass slide 800 and being modulated by the quarter glass slide 800, the azimuth of the vibration plane of the second light L2 polarized in the P direction is rotated by 45° to become a right-handed circularly polarized light. The second light L2 becomes The right-handed circularly polarized light then strikes the surface of the reflector M, and after being reflected by the reflector M, forms a third light ray L3 whose polarization direction is also right-handed circularly polarized light. The third light ray L3 passes through the quarter glass 800 again, and after being modulated by the quarter glass 800, the orientation of the vibration plane of the right-handed circularly polarized light is rotated by 45° again to become S-polarized light. The third light ray L3 with S-polarized light strikes the transmission area T of the windshield 300, and after being reflected by the transmission area T of the windshield 300, forms a fourth light ray L4. Finally, the fourth light ray L4 is focused near the human eye 400 in the form of linearly polarized light S light to form an image.

[0047] Similarly, since the reflector R attached to or plated with a quarter glass slide 800 can change the polarization direction of light, the polarized light of the first light ray L1 and the third light ray L3 can have different polarization directions, so that the two light beams in the same space can be composited and utilized without interfering with each other, thereby compressing the optical path space of the head-up display device 100 and making the structure of the head-up display device more compact.

[0048] In some embodiments, the first light ray L1 and the third light ray L3 do not intersect. Fig. 9 As shown, Fig. 9 1 is a schematic diagram of another head-up display device 100 provided by an embodiment of the present application. The first light L1 emitted by the imaging unit 200 is directed to the reflection area R. The reflection area R has a reflection film layer 600 with a reflection function on one side facing the imaging unit 200. After being reflected by the reflection film layer 600, a second light L2 is formed. Then, the second light L2 is reflected to the reflection mirror M. After being reflected by the reflection mirror M, a third light L3 is formed. The third light L3 is directed to the transmission area T of the windshield 300. Finally, after being reflected by the transmission area T of the windshield 300, a fourth light L4 is formed and converges near the position of the driver's eyes 400 to realize the display function.

[0049] In this embodiment, the light emitted by the imaging unit 200 is S-polarized light or P-polarized light. Since the first light L1 and the third light L3 do not intersect with each other, and do not intersect with other light in the light path, there is no need to set a quarter glass or other forms of optical film to prevent light interference. The first light L1, the second light L2, the third light L3 and the fourth light L4 have the same polarization direction. Therefore, the brightness of the head-up display device 100 can be improved.

[0050] In order to adapt to the line of sight heights of drivers of different heights and drivers with different sitting postures, the embodiment of the present application also includes an image height adjustment structure for adjusting the imaging height, and the image height adjustment structure is arranged on the second lens M.

[0051] like Fig.10 As shown, the image height adjustment structure 1100 is arranged on the reflective lens M, and is used to adjust the size of the angle of the reflective lens M. Specifically, the image height adjustment structure 1100 includes a rotating shaft 900 and an electric adjustment mechanism 1000. The rotating shaft 900 is arranged in the middle of the reflective lens, and the reflective lens can be rotated through the electric adjustment mechanism 1000 located at the lower end of the reflective lens, thereby changing the angle of the reflected imaging light of the reflective lens M, and the position of the imaging light reflected to the windshield 300 changes, thereby changing the imaging height of the head-up display device.

[0052] In some embodiments, Figure 2As shown, the imaging unit 200 is a rectangular parallelepiped or trapezoidal platform as a whole, and the imaging unit 200 is the image source for the head-up display device 100 to provide image light. The imaging unit 200 is arranged inside the car dashboard or the center console, facing the reflection area R1 of the windshield 300, and emits the imaging light to the reflection area R. The angle between the first imaging light L1 emitted by the imaging unit 200 and the direction perpendicular to the reflection area R is the first incident angle α1, and the angle of the first incident angle is greater than 10° and less than 45°. Preferably, the angle of the first incident angle α1 is greater than 15° and less than 35°. For example, Figure 2 As shown, the first incident angle α1 is 25°.

[0053] The reflector M receives the second imaging light L2 from the reflection area R, and reflects the imaging light to the transmission area T of the windshield 300, and then reflects it from the transmission area T to the vicinity of the driver's eyes 400, thereby realizing a head-up display. The angle between the second light L2 reflected from the reflection area R to the reflector M and the direction perpendicular to the reflector M is a second incident angle α2, and the second incident angle α2 is greater than 10° and less than 45°. Preferably, the second incident angle α2 is greater than 15° and less than 35°. For example, Figure 2 As shown, the second incident angle is 20°.

[0054] The transmission area T receives the third imaging light L3 from the reflection area R, and reflects the imaging light to the transmission area T of the windshield 300, and then reflects it from the transmission area T to the vicinity of the driver's eyes 400, thereby realizing a head-up display. The angle between the third light L3 reflected by the reflector M to the transmission area T and the direction perpendicular to the transmission area T is a third incident angle α3, and the third incident angle α3 is greater than 50° and less than 70°. Preferably, the third incident angle α3 is greater than 55° and less than 65°. For example, Figure 2 As shown, the third incident angle is 60°.

[0055] Since the imaging optical path structures of a car head-up display (HUD) and a vehicle windshield-based non-media suspended display (VPA) are similar, the present application is also applicable to the imaging optical path structure of a vehicle windshield-based non-media suspended display (VPA), and the imaging optical path structure of a vehicle windshield-based non-media suspended display (VPA) realized by means of the implementation scheme proposed in the present application is included in the scope of patent protection of the application.

[0056] The imaging optical path structure of the head-up display device based on the spatial reuse of the automobile windshield of the present application has the following beneficial effects: the present application, through the above technical solution, includes a generation unit, a reflector and a windshield, the windshield includes a transmission area and a reflection area, the reflection area is located in the optical path between the imaging unit and the reflector, the imaging light beam emitted from the image generation unit is directed to the reflection area, then reflected to the reflector, and then reflected to the transmission area of ​​the windshield, and finally converged at the driver's eye position to realize the display function, and realize that under the same HUD imaging field of view (FOV), it can be realized with a smaller product volume, so that it can be arranged on more vehicle models with a smaller volume, thereby solving the contradiction between large screen and small volume in the HUD industry and solving a major pain point in the industry; the solution of the present application can also realize a larger display screen with a similar product volume, which can bring a larger FOV, so that the ARHUD screen is wider and higher, and can cover more and farther lanes. When there are dangerous factors in vehicle driving, they can be projected on the ARHUD earlier, and the driver can get an early warning earlier, thereby improving the safety of vehicle driving.

[0057] Fig.11 is a schematic diagram of a vehicle according to an embodiment of the present application, such as Fig.11 As shown, the vehicle 000 includes the head-up display device 100 of the above embodiment. The structure and imaging principle of the head-up display device 100 can refer to the description of the above embodiment, which will not be repeated here.

[0058] According to the vehicle 000 of the embodiment of the present application, the head-up display device 100 of the above embodiment can be used to realize floating real image display, and can provide a large-size display image to improve user experience. In addition, the human-computer interaction function can be realized through the interactive device of the head-up display device 100, so that the driver can operate without lowering his head, especially during driving, which can improve driving safety.

[0059] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A head-up display device, comprising: An imaging unit, a reflector and a windshield of a vehicle, wherein the windshield includes a reflection area and a transmission area, and is characterized in that the imaging unit forms a first light ray and directs the first light ray toward the reflection area, the reflection area reflects the first light ray to form a second light ray, the reflection area reflects the second light ray to the reflector, the reflector reflects the second light ray to form a third light ray, the reflector reflects the third light ray to the transmission area to form a fourth light ray, the transmission area reflects the fourth light ray to a human eye, and the fourth light ray forms a virtual image on the other side of the windshield relative to the human eye.

2. The head-up display device according to claim 1, characterized in that: The first ray and the third ray intersect.

3. The head-up display device according to claim 1, characterized in that: The first ray and the third ray do not intersect.

4. The head-up display device according to claim 1, characterized in that: It also includes a dashboard with an opening, the imaging unit, the reflector and the reflection area are all arranged inside the dashboard, and the third light is projected to the transmission area through the opening.

5. The head-up display device according to claim 1, characterized in that: The reflection area is arranged on the lower side of the windshield, and the reflection area includes a reflection film layer.

6. The head-up display device according to claim 5, characterized in that: The reflective film layer is arranged on a side of the reflective area close to the human eye.

7. The head-up display device according to claim 5, characterized in that: The windshield includes a first glass plate and a second glass plate, and the reflective film layer is disposed between the first glass plate and the second glass plate.

8. The head-up display device according to claim 7, characterized in that: The windshield further includes a wedge-shaped film disposed between the first glass plate and the second glass plate, and the reflective film layer is disposed between the wedge-shaped film and the first glass plate, the first glass plate being close to a human eye side.

9. The head-up display device according to claim 5, characterized in that: The reflective film layer includes one or more combinations of a coating film, a transfer film, a silk-screen film, a sputtering film or an evaporation film.

10. The head-up display device according to claim 5, characterized in that: The reflective film layer includes one or more combinations of aluminum, silver, aluminum alloy or silver alloy materials.

11. The head-up display device according to claim 2, characterized in that: The reflection area is provided with a quarter glass slide.

12. The head-up display device according to claim 2, characterized in that: The reflector is provided with a quarter glass slide.

13. The head-up display device according to claim 2, characterized in that: The first light, the second light, the third light and the fourth light are all polarized lights, wherein the polarization directions of the first light and the third light are different.

14. The head-up display device according to claim 3, characterized in that: The first light, the second light, the third light and the fourth light are all polarized lights, wherein the polarization directions of the first light, the second light and the third light are the same.

15. The head-up display device according to claim 13, characterized in that: The polarization directions of the first light and the third light are perpendicular.

16. The head-up display device according to claim 1, characterized in that: The first light and the reflection area form a first angle, and the first angle is between 10° and 45°.

17. The head-up display device according to claim 15, characterized in that: The second light and the reflector form a second angle, and the second angle is between 10° and 45°.

18. The head-up display device according to claim 16, characterized in that: The third light and the transmission area form a third angle, and the third angle is between 50° and 70°.

19. The head-up display device according to claim 1, characterized in that: The imaging unit is a liquid crystal display, which includes a liquid crystal box and an upper polarizer and a lower polarizer located at upper and lower sides of the liquid crystal box, wherein the absorption axis of the upper polarizer is perpendicular to the absorption axis of the lower polarizer.

20. A means of transport, characterized in that: Comprising the head-up display device according to any one of claims 1-19.

Images