Head-up display glass, head-up display system, and vehicle

Abstract

The present disclosure relates to a head-up display glass, a head-up display system and a vehicle. The head-up display glass comprises a glass body, a bonding layer, a substrate and a functional layer, wherein the bonding layer, the substrate and the functional layer are sequentially stacked on one side of the glass body, and the bonding layer is located between the glass body and the substrate; the functional layer comprises at least one stack structure composed of a first reflective layer and a second reflective layer, the first reflective layer in each stack structure is located on the side of the second reflective layer close to the substrate, and the refractive index of the first reflective layer is higher than that of the second reflective layer. The head-up display glass provided by the present disclosure can improve the display brightness of the head-up display.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more specifically, to a head-up display glass, a head-up display system, and a vehicle. Background Technology

[0002] Head-up display (HUD), also known as head-up display, works by projecting important driving information such as speed and navigation onto a projection medium, such as the windshield or a specially designed screen in the cockpit, through a designed optical path. This allows the driver to view the information, avoiding the safety hazards caused by the driver looking down at the instrument panel or other driver assistance devices, and increasing driving safety.

[0003] In related technologies, the windshield is typically used as the projection medium for reflecting image light. The image light emitted by the head-up display system's optical engine is reflected by the windshield and enters the human eye, allowing the observer to see the corresponding virtual image. However, the reflectivity of the image light on the inner surface of the windshield is low, resulting in low brightness of the image observed by the human eye. Utility Model Content

[0004] This disclosure provides a head-up display glass, a head-up display system, and a carrier that can improve the display brightness of the head-up display.

[0005] According to one aspect of this disclosure, a head-up display glass is provided, comprising: a glass body, an adhesive layer, a substrate, and a functional layer, wherein the adhesive layer, the substrate, and the functional layer are sequentially stacked on one side of the glass body, and the adhesive layer is located between the glass body and the substrate;

[0006] The functional layer includes at least one stacked structure consisting of a first reflective layer and a second reflective layer, wherein the first reflective layer in each stacked structure is located on the side of the second reflective layer closer to the substrate, and the refractive index of the first reflective layer is higher than that of the second reflective layer.

[0007] In one exemplary embodiment of this disclosure, the functional layer includes no fewer than four sets of the stacked structures.

[0008] In one exemplary embodiment of this disclosure, the functional layer includes a third reflective layer disposed on the side of the functional layer away from the substrate; the refractive index of the third reflective layer is higher than that of the second reflective layer.

[0009] In one exemplary embodiment of this disclosure, the thickness of the substrate is less than 0.5 mm, and the thickness of the functional layer is less than 1 micrometer.

[0010] In one exemplary embodiment of this disclosure, the adhesive layer comprises polyvinyl butyral.

[0011] In one exemplary embodiment of this disclosure, the substrate is glass; or, the substrate is polyethylene terephthalate.

[0012] In one exemplary embodiment of this disclosure, the refractive index of the first reflective layer is greater than or equal to 2.3, and the refractive index of the second reflective layer is less than 1.8.

[0013] In one exemplary embodiment of this disclosure, the material of the first reflective layer includes niobium oxide; and / or, the material of the second reflective layer includes silicon oxide.

[0014] In one exemplary embodiment of this disclosure, the orthographic projection of the substrate onto the glass body is within the edge of the glass body and does not coincide with the edge of the glass body.

[0015] According to another aspect of this disclosure, a head-up display system is provided, including a head-up display glass according to any of the foregoing; and a head-up display for projecting image light onto the head-up display glass, the image light being reflected at least in the functional layer.

[0016] In one exemplary embodiment of this disclosure, the image light emitted by the head-up display is entirely located at the incident point of the head-up display glass in the functional layer.

[0017] According to another aspect of this disclosure, a carrier is provided, including the head-up display glass of any of the foregoing.

[0018] The head-up display (HUD) glass disclosed herein comprises a functional layer consisting of one or more stacked structures of alternating high and low refractive index first and second reflective layers, creating a Bragg mirror effect. Image light reflected at the junctions of each first and second reflective layer, as well as at the junction of the first reflective layer and the substrate, has the same phase when returning to the initially incident surface, resulting in constructive interference and increasing the reflectivity of the image light. Furthermore, the HUD glass of this disclosure simplifies the manufacturing process. During manufacturing, the functional layer can be deposited onto the substrate first, and then the substrate is attached to the glass body using an adhesive layer. This eliminates the need for vacuum coating of the entire HUD glass, improving production efficiency and reducing costs. Moreover, during maintenance, the HUD glass can be easily removed or reattached to restore or remove its HUD function. In addition, the substrate and adhesive layer enhance the impact resistance of the glass body, improving the safety of the HUD glass.

[0019] 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

[0020] 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. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] Figure 1 This is a schematic diagram of one embodiment of the head-up display system of this disclosure.

[0022] Figure 2 This is a schematic diagram of the reflection of light from an image in the functional layer of the head-up display system of this disclosure.

[0023] Figure 3 This is a schematic diagram illustrating how the reflected light from the image in the head-up display system of this disclosure undergoes constructive interference, thereby increasing reflectivity.

[0024] Figure 4 This is a schematic diagram of the reflection of image light from the head-up display system of this disclosure in a functional layer of another embodiment.

[0025] Figure 5 This is a schematic diagram showing the mating of the substrate, adhesive layer, and glass body of the head-up display system disclosed herein.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Head-up display glass; 200. Head-up display unit; 300. Eye box;

[0028] 1. Glass body; 2. Adhesive layer; 3. Substrate; 4. Functional layer; 41. First reflective layer; 42. Second reflective layer; 43. Third reflective layer. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0030] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first” and “second” are used only as markers and are not a limitation on the number of objects.

[0031] This disclosure provides a head-up display (HUD) glass 100, a HUD system, and a vehicle. To facilitate explanation, one possible application scenario is illustrated by using the HUD glass 100 and HUD system in an automobile, specifically a car as the vehicle. Those skilled in the art should understand that the HUD glass 100 and HUD system of this exemplary embodiment can also be applied to, for example, sanitation vehicles, fire trucks, and military vehicles, as well as to fields such as shipbuilding and aviation. For example, the vehicle could be an aircraft such as a fighter jet, allowing the driver to track and aim at objects with the assistance of the HUD system. The implementation methods and technical effects of the HUD glass 100, HUD system, and vehicle of this exemplary embodiment are not limited to any specific application scenario.

[0032] To facilitate the explanation of the solutions disclosed herein, the working principle of the head-up display system will first be illustrated by way of example. (Reference) Figure 1 As shown, the head-up display system may include a head-up display glass 100 and a head-up display 200. The head-up display 200 is used to project image light onto the head-up display glass 100, and the head-up display glass 100 is used to reflect the image light onto the eye box 300 to form a target virtual image corresponding to the image light.

[0033] For example, the head-up display 200 may include an image source and an image adjustment component. The image source emits image light, and the image adjustment component deflects the image light emitted by the image source onto the head-up display glass 100. The head-up display glass 100 may be the glass of a vehicle, such as the windshield of a car, allowing the driver to observe the external environment through the windshield while receiving a virtual image of the target projected by the head-up display 200. The adhesive layer 2, substrate 3, and functional layer 4 of this disclosure may be sequentially stacked on the inner side of the head-up display glass 100, i.e., located inside the vehicle, near the eye box 300.

[0034] For example, the image source can be either a display imaging device or a virtual or real image formed by the display imaging device. For instance, the display imaging device may include a liquid crystal display (LCD), whose backlight source may include one or more of lasers, light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), stimulated fluorescence (SFF) materials, and quantum dot excitation sources; the display imaging device may also include an actively emitting dot matrix screen composed of light-emitting point sources such as LEDs, MicroLEDs, OLEDs, and plasma light-emitting points; or, the display imaging device may also include a projection imaging system based on projection technologies such as Digital Light Processing (DLP), Liquid Crystal on Silicon (LCoS), and Liquid Crystal Display (LCD), driven by light sources such as LEDs, MicroLEDs, OLEDs, lasers, and fluorescence, or combinations thereof, reflected or transmitted through display panels such as Digital Micromirror Display (DMD), LcoS, and LCD, and then projected onto a projection screen via a projection lens; the display imaging device may also include a laser beam scanning (LBS) projection imaging system where a laser beam scans the screen to form an image. All the display imaging devices mentioned above can also serve as image sources, whether real or virtual images formed by one or more refractions or reflections.

[0035] Exemplarily, the image adjustment component includes a mirror, and may also include optical elements such as lenses or waveguides. Exemplarily, in addition to redirecting image light emitted from the image source to the head-up display glass 100, the image adjustment component is also used to adjust the image light, such as magnifying the image and correcting aberrations.

[0036] Eyebox 300 refers to the area where the driver's or observer's eyes are located. The range of eyebox 300 can be determined based on the driver's height, posture, etc. Eyebox 300 defines an effective area for an eye point; only when the observer's eye point is located within this effective area can the observer see a satisfactory virtual image of the target.

[0037] The head-up display 200 projects relevant driving information in front of the driver's field of vision in the form of an image display. In related technologies, there is a problem that the reflectivity of the image light on the inner surface of the windshield is low, resulting in low brightness of the image observed by the human eye.

[0038] This disclosure provides a head-up display glass 100, comprising: a glass body 1, an adhesive layer 2, a substrate 3, and a functional layer 4, wherein the adhesive layer 2, the substrate 3, and the functional layer 4 are sequentially stacked on one side of the glass body 1, and the adhesive layer 2 is located between the glass body 1 and the substrate 3; the functional layer 4 includes at least one stacked structure composed of a first reflective layer 41 and a second reflective layer 42, wherein the first reflective layer 41 in each stacked structure is located on the side of the second reflective layer 42 closer to the substrate 3, and the refractive index of the first reflective layer 41 is higher than that of the second reflective layer 42.

[0039] The head-up display glass 100 disclosed herein has a substrate 3 disposed on the inner side of the glass body 1 via an adhesive layer 2. A functional layer 4 is provided on the substrate 3. The functional layer 4 includes one or more stacked structures composed of alternating high and low refractive index first reflective layers 41 and second reflective layers 42, which can form the effect of a Bragg mirror. Image light reflected at the junction of each first reflective layer 41 and second reflective layer 42, and at the junction of the first reflective layer 41 and the substrate 3, has the same phase when returning to the initially incident surface, thereby generating constructive interference and improving the reflectivity of the image light. Simultaneously, the head-up display glass 100 of this disclosure simplifies the manufacturing process. During manufacturing, the functional layer 4 can be deposited onto the substrate 3 first, and then the substrate 3 can be attached to the glass body 1 via the adhesive layer 2. This eliminates the need for vacuum coating of the entire head-up display glass 100, improving production efficiency and reducing costs. Furthermore, during maintenance of the head-up display glass 100, the substrate 3 can be easily removed or reattached to allow the head-up display glass 100 to retain or retain its head-up display function. In addition, the substrate 3 and the adhesive layer 2 can also improve the impact resistance of the glass body 1, thereby enhancing the safety of the head-up display glass 100.

[0040] Substrate 3 and functional layer 4 can be referenced. Figure 2 and Figure 3 As shown, Figure 2 The diagram shows the reflection of image light at the outermost surface of functional layer 4, at the junction of each first reflective layer 41 and second reflective layer 42, and at the junction of the first reflective layer 41 and the substrate 3. Figure 3 A schematic diagram is shown showing how reflected light generates constructive interference, thereby increasing reflectivity. Figure 3 In the diagram, R1 and R2 show the waveforms of image light reflected at one of the aforementioned reflective interfaces, and R3 shows the superimposed waveforms after the constructive interference of R1 and R2. Of course, Figure 3 This is only used to illustrate the effect of constructive interference on reflectivity. Those skilled in the art will understand that it does not actually represent the actual waveform of the light rays in the image of this disclosure.

[0041] It should be noted that the head-up display glass 100 provided in this disclosure can refer to a projection medium used to reflect image light to the eye box 300. In the prior art, it can typically be the windshield of a vehicle. Those skilled in the art will understand that, with technological advancements, the substrate of the head-up display glass 100, i.e., the glass body 1 described in this disclosure, may not be made of glass; however, this does not exceed the scope of this disclosure. The use of terms such as "windshield," "head-up display glass," and "glass body" in this disclosure is for ease of explanation and understanding, and is not intended to limit the materials of the head-up display glass 100 or the glass body 1.

[0042] In some embodiments, the glass body 1 can be laminated glass. For example, the glass body 1 may include an inner glass layer near the cockpit and an outer glass layer near the outside of the vehicle. The inner and outer glass layers can be bonded together, and a ghosting reduction film layer is deposited between the inner and outer glass layers to reduce the ghosting phenomenon of the laminated glass reflection. The adhesive layer 2, substrate 3, and functional layer 4 of this disclosure can be sequentially stacked on the inner side of the inner glass layer of the glass body 1, that is, on the surface of the glass body 1 adjacent to the cockpit.

[0043] For example, in one embodiment, the head-up display 200 can be mounted below the instrument panel on the vehicle's center console. When the image light is incident at an angle close to Brewster's angle of 60° to 70° at the head-up display glass 100, the reflectivity of P-polarized light, whose polarization plane is parallel to the incident plane, is close to zero. However, due to the limitations of the vehicle's interior layout, the angle at which the image light enters the windshield is exactly close to Brewster's angle, resulting in very low reflectivity of the P-component in the image light reflected from the inside of the windshield, preventing it from entering the eye box 300.

[0044] In some embodiments, particularly for head-up displays 200 that use an LCD display as the image source, the image light transmitted through the linear polarizer of the LCD display is P-light. Therefore, as the image light is reflected from the windshield to the eye box 300, a significant decrease in brightness occurs. The head-up display glass 100 provided in this disclosure can significantly increase the reflectivity of P-light, thereby improving the brightness of the head-up display projection.

[0045] In one exemplary embodiment of this disclosure, reference is made to Figure 4 As shown, the functional layer 4 also includes a third reflective layer 43, which is located on the side away from the substrate 3, and the refractive index of the third reflective layer 43 is higher than that of the second reflective layer 42. Figure 4 A schematic diagram is shown showing the reflection of image light at the interfaces of different refractive indices in functional layer 4.

[0046] For example, functional layer 4 includes a stacked structure in which a first reflective layer 41 is located on the side of the second reflective layer 42 closer to the substrate 3, and a third reflective layer 43 is provided on the side of the second reflective layer 42 away from the substrate 3. That is, the first reflective layer 41, the second reflective layer 42, and the third reflective layer 43 are stacked sequentially on the side of the substrate 3 away from the adhesive layer 2. As another example, in an exemplary embodiment of this disclosure, functional layer 4 includes two stacked structures in which the first reflective layer 41 is located on the side of the second reflective layer 42 closer to the substrate 3, and a third reflective layer 43 is provided on the side of the second reflective layer 42 away from the substrate 3 in the outermost stacked structure. That is, the first reflective layer 41, the second reflective layer 42, the first reflective layer 41, the second reflective layer 42, and the third reflective layer 43 are stacked sequentially on the side of the substrate 3 away from the adhesive layer 2.

[0047] The refractive index of the third reflective layer 43 is higher than that of the second reflective layer 42. For example, the refractive index of the third reflective layer 43 may be the same as that of the first reflective layer 41, for example, the third reflective layer 43 and the first reflective layer 41 may be made of the same material.

[0048] In one exemplary embodiment of this disclosure, the functional layer 4 includes at least four sets of stacked structures. For example, the functional layer 4 may include four sets of stacked structures. The thicknesses of the first reflective layer 41 and the second reflective layer 42 within each stacked structure may be unequal; the thicknesses of the first reflective layer 41 and the second reflective layer 42 within each stacked structure may also be unequal.

[0049] For example, the functional layer 4 includes four stacked structures and a third reflective layer 43, which can increase the average reflectivity of P-polarized light in the visible light wavelength range of 400-700nm to about 26%, and the reflection hue effect is relatively ideal.

[0050] In one exemplary embodiment of this disclosure, the thickness of the substrate 3 is less than 0.5 mm, and the thickness of the functional layer 4 is less than 1 micrometer. For example, the substrate 3 can be an ultrathin glass or polyethylene terephthalate film, and the first reflective layer 41, the second reflective layer 42, and the third reflective layer 43 of the functional layer 4 can be generated by physical vapor deposition (PVD) to form each stacked structure. Exemplarily, the first reflective layer 41, the second reflective layer 42, and the third reflective layer 43 of the functional layer 4 can be stacked layer by layer on the substrate 3 by magnetron sputtering.

[0051] refer to Figure 5As shown, after the functional layer 4 is formed, the side of the substrate 3 away from the functional layer 4 is adhered to the glass body 1 through the adhesive layer 2 to form the head-up display glass 100. For example, the adhesive layer 2 may include polyvinyl butyral. By attaching the substrate 3 to a portion of the glass body 1 through polyvinyl butyral, tests have shown that the drop ball test height and impact resistance of the head-up display glass 100 are significantly improved.

[0052] In one embodiment provided in this disclosure, the functional layer 4 includes a first stacked structure, a second stacked structure, a third stacked structure and a fourth stacked structure stacked sequentially on the side of the substrate 3 away from the adhesive layer 2, wherein the first stacked structure is closest to the substrate 3 and the fourth stacked structure is farthest from the substrate 3. In the first stacked structure, the first reflective layer 41 has a physical thickness of 25.87 nm and an optical thickness of 0.119 nm; the second reflective layer 42 has a physical thickness of 52.72 nm and an optical thickness of 0.151 nm; in the second stacked structure, the first reflective layer 41 has a physical thickness of 29.40 nm and an optical thickness of 0.136 nm; the second reflective layer 42 has a physical thickness of 244.6 nm and an optical thickness of 0.701 nm; in the third stacked structure, the first reflective layer 41 has a physical thickness of 55.55 nm and an optical thickness of 0.256 nm; the second reflective layer 42 has a physical thickness of 109.63 nm and an optical thickness of 0.314 nm; in the fourth stacked structure, the first reflective layer 41 has a physical thickness of 57.26 nm and an optical thickness of 0.264 nm; the second reflective layer 42 has a physical thickness of 211.12 nm and an optical thickness of 0.605 nm.

[0053] In one exemplary embodiment of this disclosure, the refractive index of the first reflective layer 41 is greater than or equal to 2.3, and the refractive index of the second reflective layer 42 is less than 1.8. For example, the material of the first reflective layer 41 includes niobium oxide. For example, the material of the second reflective layer 42 includes silicon oxide. The refractive index of the first reflective layer 41 may be 2.35, and the refractive index of the second reflective layer 42 may be 1.46.

[0054] In one exemplary embodiment of this disclosure, the orthographic projection of the substrate 3 onto the glass body 1 lies within the edge of the glass body 1 and does not coincide with the edge of the glass body 1. For example, the substrate 3 is attached to a portion of the glass body 1 via the adhesive layer 2. Exemplarily, the substrate 3 can be disposed in the area of ​​the glass body 1 used for head-up display, such that the image light emitted by the head-up display 200 is entirely within the functional layer 4 at the incident point of the head-up display glass 100; while in areas not used for head-up display, such as those outside the light envelope of the image light from the head-up display 200, the adhesive layer 2, substrate 3, and functional layer 4 may not be provided. This embodiment avoids directly setting an enhanced reflection structure on a large area of ​​the glass body 1, thereby eliminating the need for large vacuum coating equipment, improving production efficiency, and reducing production costs.

[0055] Furthermore, in some embodiments, the glass body 1 can be a car windshield, and its surface shape may be a complex freeform surface. This disclosure allows for the formation of a functional layer 4 on a planar substrate 3, followed by bonding the substrate 3 to the glass body 1 via an adhesive layer 2. Since the substrate 3 has a thickness of less than 0.5 mm, such as ultra-thin glass or polyethylene terephthalate film, it possesses a certain degree of flexibility. Therefore, the planar substrate 3 can be bonded to the freeform glass body 1, simplifying the process and making the uniformity of the functional layer 4 easier to control, resulting in better adjustment effects on the reflectivity and hue of image light.

[0056] Furthermore, in some embodiments of this disclosure, the substrate 3 is disposed in the area of ​​the glass body 1 used for head-up display, which is usually in front of the driver's eye level. This area corresponds precisely to the area where the driver's head will hit the glass in the event of an accident. The substrate 3 is attached to this area by the adhesive layer 2, which can improve the impact resistance of this area, thereby giving the head-up display glass 100 better head-impact safety performance.

[0057] According to another aspect of this disclosure, a head-up display system is provided, including a head-up display glass 100 and a head-up display 200 as described above. The head-up display 200 projects image light onto the head-up display glass 100, and the image light is reflected at least at the functional layer 4 to the eye box 300. For details regarding the structure, principle, and implementation of the head-up display 200 and the head-up display system, please refer to the description of the foregoing exemplary embodiments of this disclosure; further details will not be repeated here.

[0058] According to another aspect of this disclosure, a vehicle is provided, including the head-up display glass 100 of any of the foregoing embodiments. For example, the vehicle may be a car, a ship, or an aircraft.

[0059] In some embodiments of this disclosure, the vehicle may further include a head-up display 200. The head-up display 200 may be mounted below the instrument panel on the vehicle's center console. For example, the angle of incidence of the image light emitted from the head-up display 200 onto the head-up display glass 100 is 56°. In some embodiments, the head-up display 200 may also be arranged in other locations on the vehicle, as long as it facilitates the emission of image light onto the head-up display glass 100.

[0060] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A head-up display glass, characterized in that, include: The glass body, adhesive layer, substrate and functional layer are stacked sequentially on one side of the glass body, and the adhesive layer is located between the glass body and the substrate. The functional layer includes at least one stacked structure consisting of a first reflective layer and a second reflective layer, wherein the first reflective layer in each stacked structure is located on the side of the second reflective layer closer to the substrate, and the refractive index of the first reflective layer is higher than that of the second reflective layer.

2. The head-up display glass according to claim 1, characterized in that, The functional layer includes no fewer than four sets of the aforementioned stacked structures.

3. The head-up display glass according to claim 1, characterized in that, The functional layer includes a third reflective layer, which is disposed on the side of the functional layer away from the substrate; the refractive index of the third reflective layer is higher than that of the second reflective layer.

4. The head-up display glass according to any one of claims 1 to 3, characterized in that, The thickness of the substrate is less than 0.5 mm, and the thickness of the functional layer is less than 1 micrometer.

5. The head-up display glass according to claim 1, characterized in that, The adhesive layer comprises polyvinyl butyral.

6. The head-up display glass according to claim 1, characterized in that, The substrate is glass; or, the substrate is polyethylene terephthalate.

7. The head-up display glass according to claim 1, characterized in that, The refractive index of the first reflective layer is greater than or equal to 2.3, and the refractive index of the second reflective layer is less than 1.

8.

8. The head-up display glass according to claim 7, characterized in that, The material of the first reflective layer includes niobium oxide; and / or, the material of the second reflective layer includes silicon oxide.

9. The head-up display glass according to claim 1, characterized in that, The orthographic projection of the substrate onto the glass body is within the edge of the glass body and does not coincide with the edge of the glass body.

10. A head-up display system, characterized in that, include: Head-up display glass as claimed in any one of claims 1 to 9; A head-up display for projecting image light onto the head-up display glass, the image light being reflected at least in the functional layer.

11. The head-up display system according to claim 10, characterized in that, The image light emitted by the head-up display is entirely located at the incident point of the head-up display glass within the functional layer.

12. A vehicle, characterized in that, include: The head-up display glass according to any one of claims 1 to 9.

Images