Head-up display device

Abstract

The invention relates to a head-up display device. The head-up display device comprises an image generation module and an optical rotation film, the image generation module is provided with a light emitting side and is used for projecting display light to a windshield to form a display picture; the optical rotation film is arranged on the light emitting side of the image generation module, and the optical rotation film comprises a first polaroid, a light deflection layer and a second polaroid which are arranged in a stacked mode in the light emitting direction of the image generation module; the light-transmitting axis of the second polaroid rotates by a first preset angle relative to the light-transmitting axis of the first polaroid; the light deflection layer is used for deflecting the polarization direction of the light by a second preset angle, the second preset angle is equal to the first preset angle, the first preset angle is not equal to Npi, and N is a natural number including 0; therefore, on the basis of reducing backward flowing of sunlight through the optical rotation film, the cost can be effectively controlled, and the structural design freedom degree of the head-up display device can be improved.

Description

Technical Field

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

[0002] With the increasing demand for interactive experience of display information and intelligent driving, as well as the popularization of AR (full name in English: Augmented Reality, Chinese abbreviation: Augmented Reality) technology, the market prospect of HUD (full name in English: Head-Up Display, Chinese abbreviation: Head-Up Display) technology is becoming more and more broad. In actual use, sunlight enters the interior of the HUD device along the path of the display light, which not only affects the driver's reading of driving information, but also generates high heat inside the HUD device. In the existing technology, on the one hand, projection display devices such as DLP (full name in English: Digital Light Processing, Chinese abbreviation: Digital Light Processing) and LCOS (full name in English: Liquid Crystal on Silicon, Chinese abbreviation: Silicon-based Liquid Crystal) are used to solve the problem of sunlight backflow, but the equipment cost is high; on the other hand, the dust cover and curved mirror are controlled to reduce sunlight backflow, but the design freedom is low. Summary of the invention

[0003] The embodiment of the present application provides a head-up display device, which can effectively control the cost and improve the freedom of structural design of the head-up display device on the basis of reducing the backflow of sunlight by setting a light-rotating film.

[0004] In order to achieve the above object, according to a first aspect of the present application, a head-up display device is provided, comprising:

[0005] An image generation module, wherein the image generation module has a light emitting side for projecting display light onto the windshield to form a display image; and

[0006] A light-rotating film is arranged on the light-emitting side of the image generating module. In the light-emitting direction of the image generating module, the light-rotating film comprises a first polarizing film, a light deflecting layer and a second polarizing film which are stacked;

[0007] Among them, the transmission axis of the second polarizer is rotated by a first preset angle compared to the transmission axis of the first polarizer, and the light deflection layer is used to deflect the polarization direction of the light by a second preset angle, the second preset angle is equal to the first preset angle, and the first preset angle is not equal to Nπ, and N is set to a natural number including 0.

[0008] In one embodiment, the transmission axis of the second polarizer is arranged parallel to the vertical polarization direction;

[0009] The transmission axis direction of the first polarizer is rotated counterclockwise by the first preset angle compared to the vertical polarization direction;

[0010] The light deflection layer is used to rotate the polarization direction of the light clockwise by the second preset angle.

[0011] In one embodiment, the first preset angle and the second preset angle are both set to be greater than or equal to Mπ / 2 and less than or equal to Mπ / 2+45°, where M is set to a natural number including 0.

[0012] In one embodiment, the first preset angle and the second preset angle are both set to 45°.

[0013] In one embodiment, the first polarizer is configured as a reflective polarizer or an absorptive polarizer;

[0014] The second polarizer is configured as a reflective polarizer or an absorptive polarizer.

[0015] In one embodiment, the light deflection layer is configured as a magneto-optical crystal layer, and the material of the magneto-optical crystal layer includes one of yttrium iron garnet, gallate garnet and rare earth aluminate garnet.

[0016] In one embodiment, the image generation module includes:

[0017] an image generating unit having a display side; and

[0018] A reflective component is disposed on the display side of the image generating unit and reflects the light emitted from the display side to form the display light.

[0019] In one embodiment, the reflective component comprises:

[0020] a first reflector, the first reflector being disposed on a light-emitting path of the image generating unit and being used for reflecting the light emitted from the display side and forming a first reflected light emission; and

[0021] A second reflector, the second reflector is arranged opposite to the first reflector, and is used to reflect the first reflected light and form the display light.

[0022] In one embodiment, the first reflector is configured as a concave reflector, the first reflector has a first concave reflective surface, and the first concave reflective surface is arranged toward the display side of the image generating unit;

[0023] The second reflector is configured as a concave reflector. The second reflector has a second concave reflective surface. The second concave reflective surface is arranged toward the first concave reflective surface.

[0024] In one embodiment, the head-up display device further includes a frame and a dust cover, the frame having a receiving cavity, the image generation module being disposed in the receiving cavity, the frame having an opening communicating with the receiving cavity, the opening being located on a light emitting side of the image generation module, and the dust cover being disposed on the opening;

[0025] The optically active film is disposed on the side of the dust cover away from the image generation module.

[0026] In the head-up display device of the embodiment of the present application, taking the first polarizer allowing the light with an angle α between the polarization direction and the vertical polarization direction to pass as an example, the transmission axis of the second polarizer is rotated by a first preset angle θ1 compared to the transmission axis of the first polarizer, and the light deflection layer is used to deflect the polarization direction of the light by a second preset angle θ2. After the display light passes through the first polarizer, the light with an angle α between the polarization direction and the vertical polarization direction is allowed to pass. After passing through the light deflection layer, the angle between the polarization direction of the light and the vertical polarization direction is α+θ2. The second polarizer allows the angle between the polarization direction and the vertical polarization direction to be The light of α+θ1 passes through, and since θ2 is equal to θ1, the light deflected by the light deflection layer can pass through the second polarizer and be transmitted to the windshield; and the ambient light pouring back from the windshield, after passing through the second polarizer, the light whose polarization direction and the vertical polarization direction are at an angle of α+θ1 is allowed to pass through, and after passing through the light deflection layer, the angle between the polarization direction of the light and the vertical polarization direction is α+θ1+θ2; at this time, the angle between the polarization direction of the light and the direction of the light transmission axis of the first polarizer is 2θ1, and the energy of the light passing through the first polarizer meets the following formula: I=icos 2 (2θ1); since the first preset angle θ1 is not equal to Nπ, and N is set to a natural number including 0, the light will be at least partially blocked when passing through the first polarizer, thereby reducing the light entering the image generation module, thereby improving the internal heating problem of the head-up display device caused by the backflow of sunlight, and improving the performance and life of the head-up display device; at the same time, by arranging a polarizing film to block the backflow of ambient light, compared with the prior art using DLP and LCOS, the cost can be effectively controlled; and since the polarizing film is directly arranged on the light-emitting side of the image generation module, there is no need to reduce the backflow of sunlight by controlling the dust cover and the curved mirror, thereby making the head-up display device more free in structural design.

[0027] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0029] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0030] Figure 1 A light path diagram of a head-up display device (display light) provided in an embodiment of the present application;

[0031] Figure 2 A light path diagram of a head-up display device (ambient light) provided in an embodiment of the present application;

[0032] Figure 3 A light path diagram of the optically active film (displaying light) provided in an embodiment of the present application;

[0033] Figure 4 This is a light path diagram of the optically active film (ambient light) provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely 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, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] The embodiment of the present application provides a head-up display device 100. The following are detailed descriptions. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0036] The head-up display device 100 is generally used in vehicle-mounted equipment, and can also be used in the aviation industry or medical equipment, and no specific limitation is made here. The head-up display device 100 generally adopts an LCD (Liquid Crystal Display).

[0037] In addition, polarization state: the polarization state of light includes natural light, partially polarized light, linearly polarized light, circularly polarized light and elliptically polarized light. Among them, natural light is also called "natural light", which does not directly show polarization phenomenon. Natural light includes all possible vibration directions perpendicular to the propagation direction of light waves, so it does not show polarization; linearly polarized light, the trajectory of the light vector endpoint is a straight line, that is, the light vector only vibrates along a certain direction, its size changes with the phase, and the direction remains unchanged. The most common linear polarized light is light with a polarization direction of P polarization and light with a polarization direction of S polarization. Among them, S-polarization (s-polarized) vertical polarization refers to the situation where the electric field vector (E vector) of the light wave is perpendicular to the incident plane. The "incident plane" mentioned here is the plane formed by the direction of the incident light and the normal direction of the interface; in contrast to S polarization, the electric field vector direction of P polarization (p-polarized light) horizontal polarization is parallel to the incident plane.

[0038] In one embodiment of the present application, the head-up display device 100 includes an image generation module 1 and a light-rotating film 2; the image generation module 1 has a light-emitting side A for emitting display light to a windshield 200 to form a virtual image; the light-rotating film 2 is arranged on the light-emitting side A of the image generation module 1, and in the light-emitting direction of the image generation module 1, the light-rotating film 2 includes a first polarizer 21, a light deflection layer 22 and a second polarizer 23 that are stacked; wherein the light transmission axis of the second polarizer 23 is rotated by a first preset angle θ1 compared to the light transmission axis of the first polarizer 21; the light deflection layer 22 is used to deflect the polarization direction of the light by a second preset angle θ2, wherein the second preset angle θ2 is equal to the first preset angle θ1, and θ1 is not equal to Nπ, and N is set to a natural number including 0.

[0039] See also Figure 1 , Figure 1 The light path diagram of the head-up display device 100 (display light) provided in an embodiment of the present application. The head-up display device 100 includes an image generation module 1, and the image generation module 1 includes a PGU (full name: picture generating unit, Chinese abbreviation: image generation unit 11) and a reflection component 12, and the reflection component 12 is arranged on the display side B of the image generation unit 11, and reflects the light emitted from the display side B to form the display light.

[0040] When using the head-up display device 100 to project driving-related image information, such as navigation information, instrument information, etc., please refer to Figure 1The image generating unit 11 is used to generate linear polarized light, which carries driving-related image information; the linear polarized light is then transmitted through the reflective component 12 to form the display light, which is transmitted to the windshield 200 to form a virtual image, and then transmitted to the driver's eyes. The eyes receive a virtual image of the driving-related image information. The vertical-field of view (V-FOV) and horizontal-field of view (H-FOV) of the virtual image are related to the type of the head-up display device 100. Different types of head-up display devices 100 will generate different V-FOVs and different H-FOVs.

[0041] It should be noted that in order to reflect linearly polarized light to the driver's eyes, the positional relationship between the image generation unit 11 and the reflection component 12 must meet the requirements of linearly polarized light transmission, and the reflection component 12 is often fitted to the windshield to eliminate the distortion of the virtual image.

[0042] As mentioned above, in the embodiments of this application, please refer to Figure 1 and Figure 2 The optical rotation film 2 is arranged on the light-emitting side A of the image generating module 1. In the light-emitting direction of the image generating module 1, the optical rotation film 2 includes a first polarizer 21, a light deflection layer 22 and a second polarizer 23 which are stacked; wherein the light transmission axis of the second polarizer 23 is rotated by a first preset angle θ1 compared with the light transmission axis of the first polarizer 21; the light deflection layer 22 is used to deflect the polarization direction of the light by a second preset angle θ2.

[0043] See also Figure 3 , taking the example that the first polarizer 21 allows the light whose angle between the polarization direction and the polarization direction of the S-polarized light is α to pass through, it is shown that after the light passes through the first polarizer 21, the light whose angle between the polarization direction and the polarization direction of the S-polarized light is α is allowed to pass through, and after passing through the light deflection layer 22, the angle between the polarization direction of the light and the polarization direction of the S-polarized light is α+θ2. Since the transmission axis of the second polarizer 23 is rotated by the first preset angle θ1 compared with the transmission axis of the first polarizer 21, the second polarizer 23 allows the light whose angle between the polarization direction and the polarization direction of the S-polarized light is α+θ1 to pass through. Since θ2 is equal to θ1, the light deflected by the light deflection layer 22 can pass through the second polarizer 23 and be transmitted to the windshield 200.

[0044] It is known that during use, sunlight enters the head-up display device 100 along the path of the display light, and the convergence of light increases the internal heat of the head-up display device 100. Since the head-up display device 100 generally uses an LCD display screen, the maximum heat resistance of the liquid crystal component of the LCD display screen is 105°, and the maximum heat resistance of its polarizer assembly is less than 100°. Based on the demand for imaging brightness, the head-up display device 100 has a high screen brightness during use, which will cause the LCD display screen itself to heat up quickly. In addition, the backflow of sunlight increases the internal heat of the head-up display device 100, which will greatly affect the performance and life of the display screen, thereby affecting the reliability of the head-up display device 100.

[0045] See also Figure 4 After the optically active film 2 is set, the ambient light flowing back from the windshield 200 is allowed to pass through the second polarizer 23, and the angle between the polarization direction of the light and the polarization direction of the S polarized light is α+θ1. After passing through the light deflection layer 22, the angle between the polarization direction of the light and the polarization direction of the S polarized light is α+θ1+θ2. At this time, the angle between the polarization direction of the light and the direction of the light transmission axis of the first polarizer 21 is 2θ1, and the energy of the light passing through the first polarizer 21 meets the following formula: I=icos 2 (2θ1); since the first preset angle θ1 is not equal to Nπ, and N is set to a natural number including 0, the light will be at least partially blocked when passing through the first polarizer 21, thereby reducing the light entering the image generation module 1, thereby improving the internal heating problem of the head-up display device 100 caused by the backflow of sunlight, and improving the performance and life of the head-up display device 100; at the same time, by setting the optical rotation film 2 to block the backflow of ambient light, compared with the prior art using DLP and LCOS, the cost can be effectively controlled; and since the optical rotation film 2 is directly set on the light-emitting side of the image generation module 1, there is no need to reduce the backflow of sunlight by controlling the dust cover and the curved mirror, so that the structural design freedom of the head-up display device 100 is higher.

[0046] The present application does not impose any specific limitation on the form of the light deflection layer 22 . The light deflection layer 22 may be a wave plate, a prism, a liquid crystal layer, an electro-optic modulator, or a magneto-optic modulator.

[0047] In one embodiment, the light deflection layer 22 is configured as a magneto-optical crystal layer 221, and the material of the magneto-optical crystal layer 221 includes one of yttrium iron garnet, gallate garnet and rare earth aluminate garnet. The phenomenon that the polarization direction of the linear polarized light rotates after the linear polarized light passes through the magneto-optical crystal layer 221 under the action of an external magnetic field is called the Faraday effect. Moreover, under the action of a predetermined magnetic field, the magneto-optical crystal layer 221 can rotate the polarization direction of the linear polarized light passing through the magneto-optical crystal layer 221 from left to right clockwise by a predetermined degree, and can also rotate the polarization direction of the linear polarized light passing through the magneto-optical crystal layer 221 from right to left clockwise by a predetermined degree. In an embodiment of the present application, the magneto-optical crystal layer 221 is used to deflect the polarization direction of the light by a second preset angle θ2.

[0048] After the display light passes through the first polarizer 21, the light whose polarization direction has an angle α with the polarization direction of the S-polarized light is allowed to pass through. After passing through the magneto-optical crystal layer 221, the angle between the polarization direction of the light and the polarization direction of the S-polarized light is α+θ2. Since the light transmission axis of the second polarizer 23 is rotated by the first preset angle θ1 compared with the light transmission axis of the first polarizer 21, the second polarizer 23 allows the light whose polarization direction has an angle α+θ1 with the polarization direction of the S-polarized light to pass through. Since θ2 is equal to θ1, the light deflected by the light deflection layer 22 can pass through the second polarizer 23 and be transmitted to the windshield 200.

[0049] After the backflowing ambient light passes through the second polarizer 23, the light whose polarization direction is at an angle of α+θ1 to the polarization direction of the S-polarized light is allowed to pass through. After passing through the magneto-optical crystal layer 221, the angle between the polarization direction of the light and the polarization direction of the S-polarized light is α+θ1+θ2. The light will be at least partially blocked when passing through the first polarizer 21, thereby reducing the light entering the image generation module 1, thereby improving the internal heating problem of the head-up display device 100 caused by the backflow of sunlight.

[0050] The present application does not impose any specific restrictions on the magneto-optical crystal layer 221. It can be known that when the light passes through the magneto-optical crystal layer 221, along the wave propagation direction, the light is induced by the chirality of the magnetic field to produce Faraday rotation, and the polarization direction of the light rotates by an angle β=VBL (β: Faraday rotation angle; V: Verdet constant; B: magnetic flux density in the wave propagation direction; L: thickness of the magneto-optical crystal layer 221); it can be known that the rotation angle β of the polarization direction of the light can be adjusted by adjusting the magnitude of the magnetic field applied to the magneto-optical crystal layer 221 and / or the thickness of the magneto-optical crystal layer 221.

[0051] The present application does not limit the polarization direction of the light that the first polarizer 21 and the second polarizer 23 allow to pass. Figure 3 and Figure 4 , the transmission axis of the second polarizer 23 is parallel to the vertical polarization direction; the transmission axis of the first polarizer 21 is rotated counterclockwise by the first preset angle θ1 compared to the vertical polarization direction; the light deflection layer 22 is used to rotate the polarization direction of the light clockwise by the second preset angle θ2. That is, at this time, the angle α is set to -θ1.

[0052] As mentioned above, the ambient light pouring back from the windshield 200 is emitted as S-polarized light after passing through the second polarizer 23; after passing through the light deflection layer 22, the angle between the polarization direction of the light and the polarization direction of the S-polarized light is θ2. Since the transmission axis direction of the first polarizer 21 is rotated counterclockwise by the first preset angle θ2 compared to the vertical polarization direction, the first polarizer 21 allows the polarization direction to be -θ1 with respect to the polarization direction of the S-polarized light. At this time, the angle between the polarization direction of the light reaching the first polarizer 21 and the direction of the transmission axis of the first polarizer 21 is 2θ1.

[0053] It can be seen that after the ambient light flows back through the second polarizer 23 and the light deflection layer 22 , the angle between the polarization direction of the light reaching the first polarizer 21 and the direction of the light transmission axis of the first polarizer 21 is 2θ1.

[0054] It can be known that when light passes through the first polarizer 21, part of the light will be blocked, and the energy of the light passing through the first polarizer 21 meets the following formula: I = icos 2 (2α); It can be seen that when the first preset angle θ1 is set to Mπ / 2≤θ1≤Mπ / 2+45°, where M is set to a natural number including 0, the larger the value of the first preset angle θ1, the greater the energy attenuation when the light passes through the first polarizer 21, that is, the less light passes through the first polarizer 21.

[0055] The present application does not impose any specific restrictions on the value of the first preset angle θ1. When M=0, 0≤θ1≤45°; when M=1, 90°≤θ1≤135°; when M=2, 180°≤θ1≤215°; users can choose according to the actual product.

[0056] When the value of the first preset angle θ1 is configured to be 45°, the polarization direction of the light reaching the first polarizer 21 is orthogonal to the direction of the light transmission axis of the first polarizer 21, and the light is completely absorbed by the first polarizer 21. At this time, the effect of preventing the backflow of ambient light is maximized.

[0057] As mentioned above, the display light emitted by the image generation module 1 will be transmitted to the windshield 200 after passing through the optical rotation film 2; since the windshield 200 has a lower reflectivity for P-polarized light, the first polarizer 21 is configured as a reflective polarizer or an absorptive polarizer; the second polarizer 23 is configured as a reflective polarizer or an absorptive polarizer.

[0058] See also Figure 1 In an embodiment of the present application, the reflective component 12 includes a first reflector 121 and a second reflector 122; the first reflector 121 is arranged on the light output path of the image generating unit 11, and is used to reflect the light emitted from the display side B and form a first reflected light output; the second reflector 122 is arranged opposite to the first reflector 121, and is used to reflect the first reflected light and form the display light.

[0059] By adjusting the relative positions of the first reflector 121 and the second reflector 122 , the emission path of the display light can be changed.

[0060] The present application does not impose any specific limitation on the first reflector 121 and the second reflector 122 . The first reflector 121 may be a plane mirror or a concave mirror; the second reflector 122 may be a plane mirror or a concave mirror.

[0061] In one embodiment, the first reflector 121 is configured as a concave reflector, the first reflector 121 has a first concave reflective surface, and the first concave reflective surface is arranged toward the display side B of the image generating unit 11; the second reflector 122 is configured as a concave reflector, the second reflector 122 has a second concave reflective surface, and the second concave reflective surface is arranged toward the first concave reflective surface.

[0062] When the light emitted by the image generating unit 11 is reflected by the first concave reflecting surface and the second concave reflecting surface, since the first concave reflecting surface and the second concave reflecting surface have a certain convergence effect on the light, the display light formed by the reflection of the first concave reflecting surface and the second concave reflecting surface can be better converged onto the windshield 200, thereby further improving the display effect of the virtual image.

[0063] See also Figure 1The head-up display device 100 also includes a frame 3 and a dust cover 4, the frame 3 has a accommodating cavity 31, the image generation module 1 is arranged in the accommodating cavity 31, the frame 3 is provided with an opening connected to the accommodating cavity 31, the opening is located on the light-emitting side A of the image generation module 1, and the dust cover 4 is covered on the opening; wherein the optical rotation film 2 is arranged on a side of the dust cover 4 away from the image generation module 1.

[0064] Generally, in order to make the head-up display device 100 easier to install, the head-up display device 100 is provided with the frame 3 and the dust cover 4, wherein the frame 3 and the dust cover 4 form a closed accommodating cavity 31; the image generation module 1 is arranged in the accommodating cavity 31; and the optical rotation film 2 is arranged on the side of the dust cover 4 away from the image generation module 1. The light emitted by the image generation unit 11 is reflected by the first reflector 121 and the second reflector 122 to form the display light, and the display light is incident perpendicular to the optical rotation film 2, and the display light passes through the first polarizer 21, the light deflection layer 22 and the second polarizer 23, and is emitted to the windshield 200 to form a virtual image.

[0065] As mentioned above, since the first polarizer 21 is configured as a reflective polarizer or an absorptive polarizer, the first polarizer 21 has a light blocking function; at the same time, it can be known that the image generation unit 11 is usually an LCD display panel, and polarizers are usually arranged on both sides of the LCD display panel to absorb part of the polarized light. Since in the present application, the circularly polarized light emitted from the LCD display panel becomes linearly polarized light after passing through the first polarizer 21, the polarizer on the display side B of the LCD display panel can be eliminated; without affecting the light path, the setting of a layer of polarizer can be reduced, and the process of the LCD display panel can be simplified on the basis of saving costs.

[0066] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0069] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A head-up display device, characterized in that: include: An image generation module, wherein the image generation module has a light emitting side for projecting display light onto the windshield to form a display image; as well as, A light-rotating film is arranged on the light-emitting side of the image generating module. In the light-emitting direction of the image generating module, the light-rotating film comprises a first polarizing film, a light deflecting layer and a second polarizing film which are stacked; Among them, the transmission axis of the second polarizer is rotated by a first preset angle compared to the transmission axis of the first polarizer, and the light deflection layer is used to deflect the polarization direction of the light by a second preset angle, the second preset angle is equal to the first preset angle, and the first preset angle is not equal to Nπ, and N is set to a natural number including 0.

2. The head-up display device according to claim 1, characterized in that: The transmission axis of the second polarizer is arranged in parallel with the vertical polarization direction; The transmission axis direction of the first polarizer is rotated counterclockwise by the first preset angle compared to the vertical polarization direction; The light deflection layer is used to rotate the polarization direction of the light clockwise by the second preset angle.

3. The head-up display device according to claim 1, characterized in that: The first preset angle and the second preset angle are both set to be greater than or equal to Mπ / 2 and less than or equal to Mπ / 2+45°, where M is set to a natural number including 0.

4. The head-up display device according to claim 3, characterized in that: The first preset angle and the second preset angle are both set to 45°.

5. The head-up display device according to claim 1, characterized in that: The first polarizer is configured as a reflective polarizer or an absorptive polarizer; The second polarizer is configured as a reflective polarizer or an absorptive polarizer.

6. The head-up display device according to claim 1, wherein: The light deflection layer is configured as a magneto-optical crystal layer, and the material of the magneto-optical crystal layer includes one of yttrium iron garnet, gallate garnet and rare earth aluminate garnet.

7. The head-up display device according to claim 1, characterized in that: The image generation module comprises: an image generating unit having a display side; and A reflective component is disposed on the display side of the image generating unit and reflects the light emitted from the display side to form the display light.

8. The head-up display device according to claim 7, characterized in that: The reflective component comprises: a first reflector, the first reflector being disposed on a light-emitting path of the image generating unit and being used for reflecting the light emitted from the display side and forming a first reflected light emission; and A second reflector, the second reflector is arranged opposite to the first reflector, and is used to reflect the first reflected light and form the display light.

9. The head-up display device according to claim 8, characterized in that: The first reflector is configured as a concave reflector, the first reflector has a first concave reflective surface, and the first concave reflective surface is arranged toward the display side of the image generating unit; The second reflector is configured as a concave reflector. The second reflector has a second concave reflective surface. The second concave reflective surface is arranged toward the first concave reflective surface.

10. The head-up display device according to claim 1, wherein: The head-up display device further includes a frame and a dust cover, the frame having a receiving cavity, the image generating module being arranged in the receiving cavity, the frame having an opening communicating with the receiving cavity, the opening being located at a light emitting side of the image generating module, and the dust cover being arranged on the opening; Wherein, the optical rotation film is arranged on a side of the dust cover plate away from the image generation module.

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