Head-up display system and vehicle

Abstract

This disclosure provides a head-up display system and a vehicle, belonging to the field of vehicle optical display technology. The head-up display system includes a windshield, a light source assembly, and a metal wire grid; the windshield includes an inner glass layer, a mid-layer, and an outer glass layer stacked together; the light source assembly is located on the side of the inner glass layer away from the outer glass layer and is used to emit a reference beam; the metal wire grid is connected to the inner glass layer; wherein the reference beam is configured to be incident on the metal wire grid at a Brewster angle. Using this disclosure, ghosting in HUD system imaging can be eliminated.

Description

Technical Field

[0001] This disclosure belongs to the field of vehicle optical display technology, and particularly relates to a head-up display system and a vehicle. Background Technology

[0002] With the gradual development of vehicle optical display technology, the application of HUD (Head-Up Display) systems has become increasingly widespread. HUD systems project driving information such as vehicle speed, turn signals, and fuel level onto the windshield. After reflection from the windshield, a magnified virtual image is formed in front of the driver, effectively avoiding the drawback of drivers needing to look down at traditional instrument panels to obtain driving information. Currently, most HUD systems exhibit noticeable ghosting in their imaging. Summary of the Invention

[0003] This disclosure provides a head-up display system and a vehicle, which can solve the technical problems existing in related technologies. The technical solutions of the head-up display system and the vehicle are as follows: In a first aspect, this disclosure provides a head-up display system, the head-up display system including a windshield, a light source assembly and a metal grid; The windshield includes an inner glass layer, a laminated glass layer, and an outer glass layer arranged in a stacked manner; The light source assembly is located on the side of the inner glass away from the outer glass and is used to emit a reference beam; The metal wire grid is connected to the inner glass layer; The reference beam is configured to be incident on the metal wire grid at a Brewster angle.

[0004] In one possible implementation, the metal wire grid includes a substrate and a grating, the substrate being connected to the inner glass layer, and the grating being connected to the side of the substrate opposite to the inner glass layer.

[0005] In one possible implementation, the period of the grating is arranged along the X direction, and the grating lines extend along the Z direction; Wherein, the X direction is the direction between the lower end and the upper end of the windshield, and the Y direction is the thickness direction of the windshield.

[0006] In one possible implementation, the substrate material is one of polyethylene terephthalate, cellulose triacetate, and cyclic olefin polymers; The grating is made of aluminum or silver.

[0007] In one possible implementation, the substrate is formed by roll-to-roll embossing, and the grating is formed by etching.

[0008] In one possible implementation, the first projected spot formed by the reference beam on the inner glass is located within the metal wire grid.

[0009] In one possible implementation, the metal wire grid is detachably connected to the inner glass layer.

[0010] In one possible implementation, the light source assembly is also used to emit a calibration beam that can form a second projection spot on the inner glass layer, the second projection spot being adapted to the shape and size of the metal wire grid.

[0011] In one possible implementation, the inner glass layer has the same refractive index as the outer glass layer, and the difference in refractive index between the interlayer and the inner glass layer is no greater than 0.05.

[0012] Secondly, this disclosure provides a vehicle that includes a head-up display system as described in the first aspect and its possible implementations.

[0013] The technical solution provided in this disclosure includes at least the following beneficial effects: This disclosure provides a head-up display system in which a metal grid is arranged in the light-emitting direction of a light source component. The light source component emits a reference beam toward the metal grid, and the reference beam is incident on the metal grid at a Brewster angle. When the beam is incident on the metal grid at a Brewster angle, for a P-polarized beam, the metal grid allows most of the P-polarized beam to pass through and reflects a small portion of the P-polarized beam. For an S-polarized beam, the metal grid reflects most of the S-polarized beam and completely suppresses the transmission of the S-polarized beam. Since the ghosting is caused by the secondary reflection of the S-polarized light transmitted to the outer glass, and since the reference beam, after passing through the metal grid, does not have an S-polarized beam transmitted through the inner glass, there is no reflection of the S-polarized beam at the outer glass, thereby eliminating the ghosting in the head-up display system.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings: Figure 1 This is a ray tracing diagram of an S-polarized beam S1 incident on the windshield at Brewster angle and passing through the windshield, according to an embodiment of this disclosure. Figure 2This is a ray tracing diagram of a P-polarized beam P1 incident on the windshield at Brewster angle and passing through the windshield, provided in a disclosed embodiment. Figure 3 This is a schematic diagram of the structure of a head-up display system provided in an embodiment of this disclosure; Figure 4 This is a ray tracing diagram of an S-polarized beam S1 incident at Brewster angle onto a windshield with a metal wire grid 3 and passing through the windshield, according to an embodiment of this disclosure. Figure 5 This is a ray tracing diagram of a P-polarized beam P1 incident at Brewster angle onto a windshield with a metal wire grid 3 and passing through the windshield, according to an embodiment of this disclosure. Figure 6 This is a schematic diagram of a metal wire grid and inner glass structure provided in an embodiment of the present disclosure; Figure 7 This is a schematic diagram of a light spot formed on a metal wire grid by a reference beam according to an embodiment of this disclosure; Figure 8 This is a schematic diagram of the structure of a head-up display system provided in an embodiment of this disclosure; Figure 9 This is a schematic diagram of the assembly of a calibration beam forming a light spot on the inner glass layer and a metal wire grid, according to an embodiment of this disclosure.

[0016] Legend: 1. Front windshield; 11. Inner glass; 12. Laminated glass; 13. Outer glass; 101. First inner surface; 102. First outer surface; 103. Second inner surface; 104. Second outer surface; 2. Light source assembly; 3. Metal wire mesh; 31. Substrate; 32. Grating; 01, Reference beam; 010, First projected beam spot; 02, Calibration beam; 020, Second projection spot.

[0017] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0024] With the gradual development of vehicle optical display technology, the application of HUD systems has become increasingly widespread. A HUD system utilizes the principle of optical reflection to project key driving information such as vehicle speed, turn signals, and fuel level as magnified virtual images onto a transparent windshield in front of the driver's field of vision. This allows users to observe this driving information without shifting their gaze, effectively avoiding the drawback of drivers needing to look down at a traditional instrument panel for this information. HUD systems significantly improve driving safety and are gradually becoming a core component of intelligent vehicle human-machine interaction systems and an important manifestation of intelligent driving technology. Currently, to ensure sufficient impact resistance, national standards require vehicle windshields to use double-layered glass. This double-layered glass structure is also called "laminated glass." Specifically, a windshield typically consists of an inner layer of glass, an outer layer of glass, and a PVB (Polyvinyl Butyral) film between the two layers. This double-layered glass structure significantly improves the strength and height of the windshield, making it less prone to breakage when impacted by flying stones at high speeds. If the windshield shatters due to a greater impact, the PVB film can, to some extent, contain the broken glass shards, reducing the risk of injury to occupants. However, the light beam emitted by the HUD system, after being reflected twice by the inner and outer glass layers, easily forms two non-overlapping virtual images, resulting in noticeable ghosting in most HUD images. Below, with the help of the attached diagram... Figure 1 and Figure 2 Please explain the cause of ghosting. See [link / reference]. Figure 1 and Figure 2 The windshield includes an inner glass layer, an outer glass layer, and a PVB film installed on the inner and outer glass layers. In the direction from inside the vehicle cabin to outside the vehicle cabin, the first inner surface 101, the first outer surface 102, the second inner surface 103, and the second outer surface 104 of the inner glass layer are distributed sequentially. Since the refractive index difference between the PVB film and the inner and outer glass layers is very small, the reflection of light when entering and exiting the PVB film is very subtle. Therefore, when discussing the cause of ghosting in this disclosure, the reflection of the light beam at the first outer surface 102 and the second inner surface 103 is ignored, and only the reflection of the light beam between the glass and the air is considered.

[0025] Figure 1 This is a ray tracing diagram of an S-polarized light beam S1 incident at a Brewster angle onto and through the windshield, according to an embodiment of this disclosure. An S-polarized light beam refers to a beam whose electric field vector vibration direction is perpendicular to the incident plane, i.e., perpendicular to the windshield. Figure 1 As shown, the S-polarized beam S1 reaches the first inner surface 101. Part of the light is transmitted through the first inner surface 101, forming beam S11 in the figure. Part of the light is reflected by the first inner surface 101, forming beam S12 in the figure. Beam S12 is the first beam directed into the cockpit. Part of the beam is absorbed by the first inner surface 101 (this portion is very small, and obviously the absorbed beam is not the cause of the ghosting, so it will not be mentioned again in the following explanation). Beam S11 continues to transmit through the first outer surface 102 and the second inner surface 103. Beam S11 reaches the second outer surface 104. Part of the beam is transmitted through the second outer surface 104, forming beam S111 in the figure. Part of the beam is reflected by the second outer surface 104, forming beam S112 in the figure. Obviously, beam S111 is directed out of the cockpit and does not cause ghosting. For beam S112, its propagation direction changes from pointing outwards to pointing inwards. Beam S112 passes through the second inner surface 103 and the first outer surface 102, reaching the first inner surface 101. Part of the beam is transmitted through the first inner surface 101, forming beam S1121 in the figure, and part of the beam is reflected by the first inner surface 101, forming beam S1122 in the figure. Beam S1122 is the second beam directed into the cockpit. (Continue to see...) Figure 1 Beams S11 and S1122 are directed into the cockpit in parallel or nearly parallel directions. These two beams can form magnified virtual images, thus causing ghosting.

[0026] Figure 2This is a ray tracing diagram of a P-polarized light beam P1 incident at a Brewster angle onto and through a windshield, according to a disclosed embodiment. A P-polarized light beam refers to a beam whose electric field vector vibration direction is parallel to the incident plane, i.e., parallel to the windshield. Figure 2 As shown, the P-polarized light beam P1 reaches the first inner surface 101. The beam passes through the first inner surface 101, forming beam P11 as shown in the figure. Since the P-polarized light beam P1 is incident on the windshield at a Brewster angle, according to the Brewster angle effect, the P-polarized light beam P1 is not reflected at all on the first inner surface 101, and therefore does not form a reflected beam. Beam P11 continues to pass through the first outer surface 102 and the second inner surface 103, reaching the second outer surface 104. The beam passes through the second outer surface 104, forming beam P111. Clearly, beam P111 is directed outwards from the cockpit and does not cause ghosting. Similarly, according to the Brewster angle effect, beam P11 is not reflected at all on the second outer surface 104, and therefore does not form a reflected beam. Therefore, the P-polarized light beam P1 does not form any beam directed into the cockpit after passing through the windshield; thus, the P-polarized light beam P1 is not the cause of ghosting.

[0027] Based on the above analysis, the beam emitted by the HUD system can be understood as a beam formed by the superposition of P-polarized beams and S-polarized beams. When the beam emitted by the HUD system is incident on the windshield at Brewster angle, the ghosting phenomenon is caused by the S-polarized beam. More specifically, the ghosting phenomenon is caused by the reflection of the S-polarized beam that is partially transmitted through the first inner surface 101 onto the second outer surface 104.

[0028] Based on the above analysis, it is easy to understand that when the beam emitted by the HUD system does not strike the windshield at Brewster angle, it will also cause ghosting. In this case, the P-polarized beam will be reflected by the first inner surface 101 and the second outer surface 104. The P-polarized beam is also one of the causes of ghosting in this situation.

[0029] To address the issue of noticeable ghosting, this disclosure provides a head-up display system, such as... Figure 3 As shown, the head-up display system includes a windshield 1, a light source assembly 2, and a metal grid 3.

[0030] In the diagram, the X, Y, and Z directions are perpendicular to each other. The positive X direction points from the bottom to the top of the windshield 1. The positive Y direction is perpendicular to the thickness of the windshield 1 and points from inside the driver's area to outside the driver's cabin. The positive Z direction points from the right side of the windshield 1 to the left side.

[0031] Specifically, see Figure 3The windshield 1 includes an inner glass layer 11, a laminate 12, and an outer glass layer 13 arranged in layers. In the direction from inside the vehicle cabin to outside the vehicle cabin, the first inner surface 101 of the inner glass layer 11, the first outer surface 102 of the inner glass layer 11, the second inner surface 103 of the outer glass layer 13, and the second outer surface 104 of the outer glass layer 13 are distributed in sequence.

[0032] Further, see Figure 3 The light source assembly 2 is located on the side of the inner glass 11 away from the outer glass 13 and is used to emit a reference beam 01. The metal grid 3 is connected to the first inner surface 101 and the reference beam 01 is configured to be incident on the metal grid 3 at Brewster angle.

[0033] Using the technical solution provided in this disclosure, for a head-up display system, a metal grid 3 is arranged in the light-emitting direction of the light source component 2. The light source component 2 can emit a reference beam 01 towards the metal grid 3, and the reference beam 01 is incident on the metal grid 3 at a Brewster angle. When the beam is incident on the metal grid 3 at a Brewster angle, for a P-polarized beam, the metal grid 3 allows most of the P-polarized beam to pass through and reflects a small portion of the P-polarized beam. For an S-polarized beam, the metal grid 3 can reflect most of the S-polarized beam and completely suppress the transmission of the S-polarized beam. Accordingly, after the reference beam 01 passes through the metal grid 3, there is no S-polarized beam transmitted through the first inner surface 101, and therefore there is no reflection of the S-polarized beam at the second outer surface 104, thereby eliminating ghosting in the head-up display system.

[0034] Figure 4 This is a ray tracing diagram of an S-polarized beam S1 incident at Brewster angle onto a windshield with a metal wire grid 3 and passing through the windshield, according to an embodiment of this disclosure. Figure 5 This is a ray tracing diagram of a P-polarized beam P1 incident at a Brewster angle onto a windshield with a metal wire grid 3 and passing through the windshield, according to an embodiment of this disclosure. Below, in conjunction with... Figure 4 and Figure 5 The light distribution of the head-up display system provided in the embodiments of this disclosure will be briefly described.

[0035] like Figure 4 As shown ( Figure 4 (The metal grid 3 is not shown in the figure). When the S-polarized beam S1 reaches the metal grid 3, under the action of the metal grid 3: the transmission of the beam S1 is completely suppressed, that is, the beam S1 does not transmit through the metal grid 3. Correspondingly, the beam S1 does not transmit through the first inner surface 101. Most of the beam S1 is reflected by the metal grid 3, forming the beam S12 in the figure.

[0036] like Figure 5As shown ( Figure 5 (The metal grid 3 is not shown in the figure). When the P-polarized beam P1 reaches the metal grid 3, under the action of the metal grid 3: most of the beam P1 is transmitted through the metal grid 3 to the first inner surface 101, and is projected through the first inner surface 101 in a non-reflective manner, forming the beam P11 in the figure. The beam P11 continues to be transmitted through the first outer surface 102 and the second inner surface 103, and the beam P11 reaches the second outer surface 104. The beam P11 is projected through the second outer surface 104 in a non-reflective manner, forming the beam P111. A small part of the beam P1 is reflected by the metal grid 3, forming the beam P12 in the figure.

[0037] Beams S12 and P12 work together to form a magnified virtual image used to display driving information. Since beams S12 and P12 are two completely overlapping polarized beams, the head-up display system provided in this embodiment of the present disclosure no longer suffers from ghosting.

[0038] The following is a detailed description of the specific structure of the head-up display system: 1. Front windshield The windshield 1 is a component in the head-up display system used to reflect the light beam emitted by the light source assembly 2 to form a magnified virtual image.

[0039] See Figure 3 The windshield 1 is made of Figure 3 Extending from the upper left to the lower right, the area at the lower left of the windshield 1 is the cockpit area, and the area at the upper right of the windshield 1 is the driver's forward field of vision area. In addition, when describing the embodiments of this disclosure, the actual small curvature of the windshield 1 is ignored, and the windshield 1 is described as a flat glass.

[0040] like Figure 3 As shown, the windshield 1 includes an inner glass layer 11, a laminated layer 12, and an outer glass layer 13.

[0041] Among them, interlayer 12 is a PVB film layer.

[0042] In practice, the PVB film layer, made of a viscoelastic polymer material, can effectively fill the gap between the inner glass layer 11 and the outer glass layer 13, thereby making the windshield 1 a complete whole.

[0043] In some examples, the inner glass 11 and the outer glass 13 have the same refractive index.

[0044] For example, the refractive indices of the inner glass 11 and the outer glass 13 are between 1.52 and 1.54. For instance, the refractive indices of the inner glass 11 and the outer glass 13 are both 1.52, 1.53, or 1.54.

[0045] In some examples, the refractive index difference between the interlayer 12 (PVB film) and the inner glass 11 is no greater than 0.05. Thus, the refractive index differences between the inner glass 11 and the interlayer 12, and between the outer glass 13 and the interlayer 12, are very small. This allows the light beam to undergo only very weak reflection between the first outer surface 102 of the inner glass 11 and the second inner surface 103 of the outer glass 13, resulting in a virtual image formed by the reflected light beam that is so blurred that it is almost impossible for the driver to observe with the naked eye, thus avoiding noticeable ghosting.

[0046] For example, the refractive index of the interlayer 12 is between 1.48 and 1.49. When the refractive index of the interlayer 12 is 1.48, the refractive index of the inner glass 11 can be 1.52 or 1.53. When the refractive index of the interlayer 12 is 1.49, the refractive index of the inner glass 11 can be 1.52, 1.53 or 1.54.

[0047] II. Light Source Component 2 The light source component 2 is the component that emits the light beam in the head-up display system.

[0048] like Figure 3 As shown, the light source assembly 2 is used to emit a beam of light into the metal wire grid 3, which contains light carrying driving information.

[0049] In some examples, the light source assembly 2 includes a light source and a polarization adjustment element. The light source is used to emit a beam of light into the metal wire grid 3. The polarization adjustment element is located in the light emission direction of the light source and between the light source and the metal wire grid 3. The polarization adjustment element is used to adjust the beam of light emitted by the light source.

[0050] In practice, based on the above discussion, the light beam emitted by the light source is incident on the metal grid 3 at Brewster angle. Under the action of the metal grid 3, the reflection ratio of the S-polarized beam and the P-polarized beam included in the light beam is different. Therefore, the proportion of S-polarized light and P-polarized light included in the light beam reflected to the driver's glasses is different.

[0051] Using the technical solution provided in the above example, the ratio of S-polarized light and P-polarized light in the light beam reaching the metal grid 3 can be adjusted by a polarization adjustment component between the light source and the metal grid 3, thereby making the ratio of S-polarized light and P-polarized light in the light beam reflected to the driver's glasses tend to be equal.

[0052] In some examples, the light source component 2 can be an LED (Light Emitting Diode). This reduces the overall cost and energy consumption of the head-up display system. In other examples, a laser can be used as the light source. This increases the overall brightness of the magnified virtual image formed by the head-up display system, thus improving its visibility.

[0053] III. Metal Grid 3 The metal wire grid 3 is the core component of the head-up display system provided in this disclosure, and is used to suppress the S-polarized light in the beam emitted by the light source assembly 2, and to suppress the transmission of the S-polarized light through the inner glass 11.

[0054] In some possible embodiments, such as Figure 6 As shown, the metal wire grid 3 comprises multiple parts.

[0055] See Figure 6 and combined Figure 3 The metal wire grid 3 includes a substrate 31 and a grating 32. The substrate 31 has a thin plate structure and is connected to the first inner surface 101 of the inner glass 11. The grating 32 is connected to the side of the substrate 31 away from the inner glass 11.

[0056] Please continue reading Figure 6 The figure only shows a partial schematic diagram of the inner glass 11 and does not represent the actual size relationship between the metal grid 3 and the inner glass 11.

[0057] In implementation, head-up display systems can be divided into windshield-type (referred to as W-HUD) and augmented reality-type (referred to as AR-HUD). For W-HUD, its FOV (Field of View) is usually small, for example, 10° × 5°. The two angles represent the horizontal field of view and the vertical field of view, respectively. Taking the distance from the light outlet of the light source component 2 to the windshield 1 as 10cm as a calculation, the size of the light spot formed by the light source component 2 on the windshield 1 is approximately 1.8cm × 0.9cm. Correspondingly, the overall size of the metal wire grid 3 needs to be set slightly larger than the size of the light spot. For example, the size of the metal wire grid 3 is 2.0cm × 1.0cm. For AR-HUD, its FOV is usually larger, such as 13°×5° or even 14.25°×5°. The two angles represent the horizontal field of view and the vertical field of view, respectively. Taking the distance from the light outlet of the light source component 2 to the windshield 1 as 10cm as a calculation, the size of the light spot formed by the light source component 2 on the windshield 1 is about 2.6~2.85cm×0.9cm. Correspondingly, the overall size of the metal grid 3 needs to be set slightly larger than the size of the light spot. For example, the size of the metal grid 3 is 2.7~3.0cm×1.0cm.

[0058] As can be seen, the overall size of the metal wire mesh is very limited, so even if it is installed on the windshield 1 of the vehicle, it will not significantly affect the driver's vision.

[0059] In some examples, grating 32 includes a plurality of parallel-arranged line gratings.

[0060] like Figure 6 As shown, multiple gratings each have a strip structure, the period of grating 32 (i.e. the distance between two adjacent gratings) is arranged along the X direction, and the gratings of grating 32 all extend along the Z direction.

[0061] In some examples, the substrate 31 is made of a material with good light transmittance. Exemplarily, the material of the substrate 31 is one of polyethylene terephthalate, cellulose triacetate, and cyclic olefin polymers. Further, the material of the substrate 31 can be a combination of polyethylene terephthalate, cellulose triacetate, and cyclic olefin polymers. This minimizes the extent to which the metal wire grid 3 obstructs the driver's view.

[0062] Furthermore, the substrate 31 can be formed using a roll-to-roll embossing process. In practice, the material used to form the substrate 31 undergoes rigorous pretreatment processes such as degreasing and washing to ensure the material surface is free of impurities. Subsequently, a rigid template with a nanowire grid structure can be used for roll-to-roll embossing, enabling mass production and reducing costs.

[0063] In some examples, the grating 32 is made of aluminum. Aluminum exhibits good polarization properties across a broad spectral range (ultraviolet to infrared) and is relatively inexpensive; therefore, using aluminum for the grating 32 reduces its overall cost. In other examples, the grating 32 is made of silver.

[0064] Furthermore, the grating 32 can be formed using an etching process.

[0065] In some possible embodiments, the coverage area of ​​the metal wire grid 3 is larger than the imaging area of ​​the reference beam 01 emitted from the light source assembly 2. This ensures that the metal wire grid 3 completely modulates the reference beam 01 emitted from the light source assembly 2.

[0066] like Figure 7 As shown, the reference beam 01 emitted by the light source assembly 2 is incident on the metal wire grid 3 at Brewster angle. The reference beam 01 can form a first projection spot 010 on the metal wire grid 3. The edges of the first projection spot 010 are located within the metal wire grid 3. More specifically, the edges of the first projection spot 010 are located within the effective modulation area of ​​the metal wire grid 3. The effective modulation area is the area formed by the edges of multiple gratings 32.

[0067] It should be noted that the first projected light spot 010 shown in the figure is circular. This shape is only an example and does not limit the specific shape of the grating emitted by the light source component 2 in the metal wire grid 3.

[0068] In some possible embodiments, the metal wire grid 3 is detachably connected to the inner glass layer 11. Exemplarily, the metal wire grid 3 and the inner glass layer 11 can be bonded together with traceless adhesive. When it is necessary to remove the metal wire grid 3, the user can peel off the flange from the edge of the base 31 to remove the metal wire grid 3.

[0069] In practice, the metal wire grid 3 is attached to the windshield 1. Although the metal wire grid 3 is connected to the first inner surface 101 of the inner glass 11 in the windshield 1, it may still fail under the influence of prolonged sunlight and airflow circulation inside the cockpit. In this case, the user can manually remove the failed metal wire grid 3 and reinstall the unfailed metal wire grid 3 on the first inner surface 101 to solve the ghosting problem of the head-up display system.

[0070] In some examples, the light source assembly 2 is able to provide position guidance for the reinstalled metal wire grid 3.

[0071] like Figure 8 As shown, the light source assembly 2 is also used to emit a calibration beam 02. Unlike the reference beam 01 mentioned above, the calibration beam 02 can be composed of light without driving information. Further, as... Figure 9 As shown and combined Figure 3 The calibration beam 02 can form a second projection spot 020 on the first inner surface 101 of the inner glass 11. The shape and size of the second projection spot 020 are adapted to the shape and size of the metal wire grid 3, respectively.

[0072] More specifically, the shape and size of the second projected spot 020 are adapted to the shape and size of the substrate 31 in the metal wire grid 3.

[0073] As an example, see Figure 9 The substrate 31 has a rectangular thin plate structure. The calibration beam 02 can form a rectangular second projection spot 020 on the first inner surface 101 of the inner glass 11, which is used to indicate the installation position of the metal wire grid 3.

[0074] In practice, the light source assembly 2 can continuously emit a calibration beam 02, thereby forming a persistent second projection spot 020 on the first inner surface 101. Subsequently, the user can apply traceless adhesive to the side of the substrate 31 away from the grating 32, align the edge of the substrate 31 with the edge of the second projection spot 020, and press the substrate to attach the metal wire grid 3 to the first inner surface 101.

[0075] This improves the positional accuracy of the reinstalled metal wire grid 3 and prevents misalignment between the reference beam 01 emitted by the light source assembly 2 and the reinstalled metal wire grid 3.

[0076] In some possible embodiments, the head-up display system also includes a controller. The controller is communicatively connected to the vehicle's infotainment system and is used to emit a reference beam 01 or a calibration beam based on beam switching commands sent by the vehicle's infotainment system.

[0077] The controller can be one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), central processing units (CPUs), or other electronic components. The aforementioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof; this application does not impose specific limitations on the embodiments thereof.

[0078] The technical solutions provided in this disclosure have at least the following beneficial effects: This disclosure provides a head-up display system. In this system, a metal grid 3 is arranged in the light-emitting direction of a light source assembly 2. The light source assembly 2 emits a reference beam 01 towards the metal grid 3, and the reference beam 01 is incident on the metal grid 3 at a Brewster angle. When the beam is incident on the metal grid 3 at a Brewster angle, for a P-polarized beam, the metal grid 3 allows most of the P-polarized beam to pass through and reflects only a small portion of it. For an S-polarized beam, the metal grid 3 reflects most of the S-polarized beam and completely suppresses its transmission. Therefore, after the reference beam 01 passes through the metal grid 3, there is no S-polarized beam transmitted through the first inner surface 101, and thus no S-polarized beam is reflected at the second outer surface 104, thereby eliminating ghosting in the head-up display system.

[0079] This disclosure provides a vehicle that includes the head-up display system described above.

[0080] This disclosure does not specifically limit the type of vehicle, such as cars, buses, trucks, sport utility vehicles (SUVs), etc. The vehicle can be a gasoline vehicle, a pure electric vehicle (BEV, or EV), or a hybrid electric vehicle (HEV), such as a range-extended vehicle or a plug-in hybrid vehicle.

[0081] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A head-up display system, characterized in that, The head-up display system includes a windshield (1), a light source assembly (2), and a metal wire grid (3). The windshield (1) includes an inner glass layer (11), a laminate (12) and an outer glass layer (13) arranged in layers. The light source assembly (2) is located on the side of the inner glass (11) away from the outer glass (13) and is used to emit a reference beam (01). The metal wire grid (3) is connected to the inner glass (11). The reference beam (01) is configured to be incident on the metal wire grid (3) at Brewster angle.

2. The head-up display system according to claim 1, characterized in that, The metal wire grid (3) includes a substrate (31) and a grating (32), the substrate (31) being connected to the inner glass (11), and the grating (32) being connected to the side of the substrate (31) away from the inner glass (11).

3. The head-up display system according to claim 2, characterized in that, The period of the grating (32) is arranged along the X direction, and the grating lines of the grating (32) extend along the Z direction; Wherein, the X direction is the direction between the lower end and the upper end of the windshield (1), and the Y direction is the thickness direction of the windshield (1).

4. The head-up display system according to claim 2, characterized in that, The material of the substrate (31) is one of polyethylene terephthalate, cellulose triacetate and cyclic olefin polymer; The grating (32) is made of aluminum or silver.

5. The head-up display system according to claim 2, characterized in that, The substrate (31) is formed by roll-to-roll embossing, and the grating (32) is formed by etching.

6. The head-up display system according to claim 1, characterized in that, The first projection spot (010) formed by the reference beam (01) on the inner glass (11) is located within the metal wire grid (3).

7. The head-up display system according to claim 1, characterized in that, The metal wire grid (3) is detachably connected to the inner glass (11).

8. The head-up display system according to claim 7, characterized in that, The light source assembly (2) is also used to emit a calibration beam (02), which is capable of forming a second projection spot (020) on the inner glass (11), and the second projection spot (020) is adapted to the shape and size of the metal wire grid (3).

9. The head-up display system according to claim 1, characterized in that, The inner glass (11) and the outer glass (13) have the same refractive index, and the difference in refractive index between the interlayer (12) and the inner glass (11) is not greater than 0.

05.

10. A vehicle, characterized in that, The vehicle includes a head-up display system as described in any one of claims 1 to 9.

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