Head-up display system and vehicle

Abstract

The application relates to the technical field of display, and provides a head-up display system and a vehicle. The head-up display system provided by the application comprises an image source, the image source is used for emitting incident light; a reflection member is arranged on the light path of the incident light, the reflection member is used for reflecting the incident light and emitting reflected light; and a deflection member is arranged on the light path of the reflected light, the deflection member is used for refracting and emitting the reflected light.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a head-up display system and a vehicle. Background Technology

[0002] Head-up displays (HUDs) typically employ either Senkrecht (S-light) or Parallel (P-light) light sources. Among these, the Parallel (P-light) light source meets the needs of users wearing polarized lenses to view information on the HUD and shows promising development prospects. However, the Parallel (P-light) reflective scheme requires the use of a Parallel reflective film in the reflective element. In related technologies, Parallel panoramic head-up displays (P-HUDs) suffer from ghosting and poor viewing experience. Summary of the Invention

[0003] This application aims to address the problems in related technologies and proposes a head-up display system and a vehicle.

[0004] This application provides a head-up display system, including:

[0005] Image source, used to emit incident light;

[0006] A reflector is placed in the optical path of the incident light and is used to reflect the incident light and emit reflected light.

[0007] A deflector is placed in the optical path of the reflected light and is used to refract and emit the reflected light.

[0008] In some alternative embodiments, the deflector includes a first glass, a deflecting film, and a second glass, with the reflective film disposed between the first glass and the second glass.

[0009] In some alternative embodiments, at least one surface of the deflection film is wedge-shaped.

[0010] In some alternative embodiments, the first glass is a light-transmitting material, and / or the second glass is a light-transmitting material.

[0011] In some alternative implementations, the light-transmitting material is high-transmittance glass or plexiglass.

[0012] In some alternative embodiments, it further includes: a blocking member disposed in the optical path of the reflected light to block part of the reflected light and / or the incident light.

[0013] In some alternative implementations, the deflector is positioned between the shielding member and the reflector.

[0014] In some alternative embodiments, the reflector includes a reflective film for reflecting the incident light.

[0015] In some alternative implementations, the difference between the incident angle of the incident light and the Brewster angle is less than a preset difference.

[0016] In some alternative implementations, the optical paths of the incident light and the reflected light do not overlap at least partially.

[0017] This application also provides a vehicle that includes the head-up display system described above.

[0018] In some alternative implementations, the reflector is the vehicle's windshield.

[0019] In summary, this application can achieve at least the following technical effects:

[0020] The head-up display system of this application refracts and emits the reflected light by setting a deflector in the optical path of the reflected light, thereby controlling the incident light emitted by the image source to be near the Brewster angle, thus suppressing ghosting, solving the problem of ghosting in the head-up display system under P-light conditions, and improving the viewing effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a head-up display system in related technologies. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of a head-up display system in related technologies. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the head-up display system in the embodiments of this application. Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the head-up display system in the embodiments of this application. Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the deflection element in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the reflector in an embodiment of this application.

[0027] Attached image labels:

[0028] 1. Reflector; 11. Third glass; 12. Reflective film; 13. Fourth glass; 2. Image source; 3. Blocking element; 4. Human eye; 5. Deflector; 51. First glass; 52. Deflecting film; 53. Second glass. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] In related technologies, the P-light panoramic head-up display (P-HUD) employs an inner coating scheme for the reflector. The reason for ghosting under P-light light is that, besides the reflection of P-light rays at the reflective film of reflector 1, the inner surface of reflector 1 also reflects P-light rays. The large distance difference between these two reflected rays results in two virtual images, which, in turn, cause a ghosted image to appear to the driver, affecting the viewing experience. Figure 1 , Figure 2 , Figure 4 As shown, the imaging principle of P-HUD is to determine the imaging area and the position of the eye box (the position of the human eye) and then confirm the placement of the image source 2 in reverse. Since the imaging position of P-HUD is within 5° below the position of the eye box, it can be roughly inferred that the incident angle θ of the incident light is at least greater than (95-β)°, where β is the tilt angle of reflector 1. Since the tilt angle of conventional car models is less than 30°, the incident angle θ of the incident light is generally greater than 65°, which is higher than the Brewster angle of 57° between air and glass. Therefore, it is impossible to suppress ghosting by controlling the incident angle θ to be near the Brewster angle. The Brewster angle is also known as the polarization angle. When natural light is incident at the Brewster angle, the reflected light and the refracted light are perpendicular to each other.

[0036] The current solutions for addressing the ghosting problem in HUDs are as follows:

[0037] By controlling the incident light to be reflected only on one surface or almost only on one surface, such as by attaching or coating a P-light reflective film on the inner surface of the windshield, almost all the light is reflected in the P-light reflective film area, and very little or no light can enter the intermediate interlayer for reflection, thereby eliminating ghosting.

[0038] Alternatively, the direction of the light can be controlled to make the position of the ghosted image coincide with the position of the main image as much as possible. For example, a wedge-shaped film can be used to adjust the position of the virtual image, or the routes of the glass and image source 2 can be designed as a whole through calculation to keep the positions of the two images within a certain angle. Most HUDs currently use this method to eliminate ghosting.

[0039] Alternatively, the intensity of the light can be adjusted to increase the brightness difference between the two images, such as by reducing the angle between the two reflected virtual images or weakening the brightness of one of the secondary images. These solutions, however, would significantly increase material costs or impose much higher requirements on the entire system.

[0040] Example 1:

[0041] Embodiment 1 of this application provides a head-up display system, including:

[0042] Image source 2, used to emit incident light;

[0043] Reflector 1 is disposed in the optical path of the incident light and is used to reflect the incident light and emit reflected light.

[0044] Deflector 5 is disposed in the optical path of the reflected light and is used to refract and emit the reflected light.

[0045] By setting a deflector 5 in the optical path of the reflected light, the reflected light emitted by the reflector 1 is refracted and emitted, thereby controlling the incident light emitted by the image source 2 to be near the Brewster angle, thus suppressing ghosting, solving the problem of ghosting in the display system under P-light conditions, effectively improving the projection effect of P-HUD, and enhancing the viewing experience.

[0046] The head-up display system in related technologies mainly includes an image source 2 for providing a light source and a reflector 1 for reflecting the light source. The light enters the human eye 4 after being reflected by the reflector 1. This application, however, sets a deflector 5 in the optical path of the reflected light from the reflector 1 to the human eye 4. The deflector 5 refracts the reflected light, thereby changing the optical path of the reflected light. Specifically, the image source 2 is used to generate a light source and emit incident light, which can be P-beam. The projection light of the head-up display system is expected to be pure P-beam or primarily P-beam. The image source 2 typically includes a PGU (Image Generation Unit) and a Concave Mirror. The PGU is used to generate graphics and control brightness; the Concave Mirror is used to magnify the image and eliminate distortion caused by the reflector 1 (windshield). The incident light emitted by the image source 2 is reflected by the reflector 1, which can also further magnify the image.

[0047] By adding a deflector 5 to the optical path of the reflected light, the incident light rays with an incident angle near Brewster's angle are deflected to the human eye at angle 4, and the optical path is as follows: Figure 3 , Figure 4 As shown. The function of the deflector 5 is to deflect the reflected light at a certain angle. The reflected light enters the deflector 5 from one side, and after refraction inside the deflector 5, the light rays exit from the other side of the deflector 5 and enter the human eye 4.

[0048] This solution fixes the incident angle of the incident light near the Brewster angle. By customizing the deflector 5, light rays with an incident angle of the Brewster angle are directed into the human eye 4, thus reducing ghosting. The reflectivity of the reflector 1 for P-light drops to a very low level near the Brewster angle. Therefore, when the light rays reflected into the human eye 4 enter the human eye 4 from the inside of the reflector 1 at an angle close to the Brewster angle, the brightness of the ghosting image is negligible.

[0049] Meanwhile, by adjusting the incident angle of the incident light emitted by image source 2 to the Brewster angle, the arrangement of image source 2 can be adjusted upwards, making image source 2 require less installation space and reducing the encroachment of image source 2 on the installation space.

[0050] In some alternative embodiments, the deflector 5 includes a first glass, a deflection film, and a second glass, with the deflection film disposed between the first glass and the second glass.

[0051] like Figure 5 As shown, the deflector 5 is a laminated glass structure, with a deflection film sandwiched between the first glass and the second glass. The first glass and the second glass are used for structural support and to protect the intermediate film structure.

[0052] Deflection films are functional thin films used to adjust the direction of light propagation, achieving viewing angle control by changing the polarization state of light. Deflection films can be designed with curved surfaces or layered to deflect light in a specific direction, optimizing the viewing angle and improving display performance in wide-viewing-angle scenarios. Deflection films can be based on dichroic materials, allowing only light from a specific direction to pass through, achieving directional transmission of polarized light. Deflection films also possess moisture-proof and UV-resistant properties to maintain long-term stable display performance.

[0053] In some alternative embodiments, at least one surface of the deflection film is wedge-shaped.

[0054] A wedge-shaped thin film is an optical device in which a small thin film is sandwiched between two parallel surfaces. When parallel light shines on this film, the light rays are reflected and refracted due to the change in the speed of light in the medium. The reflected and refracted rays meet at other points, thus producing an interference phenomenon.

[0055] Wedge-shaped films can alter the direction of light propagation. Wedge-shaped films typically exhibit a design that is thicker at the top and thinner at the bottom, or a prism-like beveled surface. This structure produces unique optical effects when deposited on a liquid substrate, and its non-flat surface reflects light differently from traditional planar thin films.

[0056] A certain thickness difference exists between the reflective and refractive surfaces of the wedge-shaped film. Adjusting this difference alters the degree of interference. When two beams of light have a phase difference, interference fringes appear. By adjusting the thickness difference, the phase difference can be varied to control the spacing and number of interference fringes.

[0057] In some alternative embodiments, the first glass is a light-transmitting material, and / or the second glass is a light-transmitting material.

[0058] Transparent materials refer to materials that can transmit visible light (0.39–0.76 μm), infrared light (1–1000 μm), and ultraviolet light (0.01–0.4 μm). They are mainly divided into three categories: inorganic transparent materials, polymer transparent materials, and transparent composite materials. Silicate glass has a light transmittance of up to 98% and is the most widely used inorganic material, but it has drawbacks such as high density and difficulty in processing. Organic materials such as polymethyl methacrylate (PMMA) and polycarbonate (PC) have light transmittance close to 90% and are lightweight and impact-resistant.

[0059] In some alternative implementations, the light-transmitting material is high-transmittance glass or plexiglass.

[0060] High-transmittance glass is a type of glass material with high visible light transmittance, typically above 70%.

[0061] Acrylic glass (chemical name polymethyl methacrylate, PMMA) is a transparent polymer material with advantages such as light weight, good weather resistance, and easy processing.

[0062] In some alternative embodiments, it further includes: a blocking member 3, which is disposed in the optical path of the reflected light to block part of the reflected light and / or the incident light.

[0063] The blocking element 3 is used to block the light from the image source 2 that is directly incident on the human eye 4, or to block excess light reflected by the reflector 1 that is outside the position of the human eye 4, thereby improving the quality of the light and pattern received by the human eye 4.

[0064] In some alternative embodiments, the deflector 5 is disposed between the shielding member 3 and the reflector 1.

[0065] In related technologies, the image source module of P-HUD needs to be recessed a certain distance to ensure that the reflected light path is transmitted to the driver's eyes, thus compressing some of the placement space in the front cabin, making the HUD have large space requirements for installation location. At the same time, the image source module is located in the gap between the instrument panel and the windshield. The image source in the gap is in an exposed state, which easily accumulates dust, affecting the imaging effect, and is difficult to observe and clean.

[0066] The shielding member 3 provides a mounting position for the deflecting member 5. By setting the deflecting member 5 between the shielding member 3 and the reflector 1, the light rays with an incident angle near the Brewster angle are deflected to the human eye 4. At the same time, the deflecting member 5 can seal the image source 2, which was originally directly exposed to the outside, so that the image source 2 is in a sealed state, reducing the mechanical damage and dust pollution caused by impurities to the image source 2, and making it easier for the user to clean impurities and dust.

[0067] In some alternative embodiments, the reflector 1 includes a reflective film for reflecting the incident light.

[0068] A reflective film is an optical material whose function is to reflect light leaking through a light guide plate back, reducing light loss and increasing backlight brightness. The reflectivity of reflective films is typically required to be above 96%, and by coating with a high-reflectivity coating or mirror-like silver plating, the reflectivity can reach over 97%, or even 100%. Reflective films can generally be divided into two main categories: metallic reflective films and all-dielectric reflective films. In addition, there are metallic dielectric reflective films that combine both.

[0069] Specifically, reflector 1 can be laminated glass or single-layer glass. The reflective film can be disposed in the middle layer of the laminated glass (e.g., ...). Figure 6 As shown, the reflective film 12 is disposed between the third glass 11 and the fourth glass 13, or disposed on one outer surface of the laminated glass, or disposed on one outer surface of the single-layer glass.

[0070] In some alternative implementations, the difference between the incident angle of the incident light and the Brewster angle is less than a preset difference.

[0071] Setting a preset difference ensures that the incident angle of the incident light is near Brewster's angle and allows for a certain angular error. For example, the preset difference can be set to ±10°, ±5°, ±3°, etc. The smaller the preset difference, the better the ghosting effect.

[0072] In some alternative implementations, the optical paths of the incident light and the reflected light do not overlap at least partially.

[0073] The deflector 5 is only disposed on the optical path of the reflected light, avoiding the placement of the deflector 5 on the optical path of the incident light, thus preventing the deflector 5 from deflecting the optical path of the incident light.

[0074] The display area in this application is not limited to the black border area printed with a black layer, but can also be displayed on the windshield in areas other than the black border area.

[0075] Example 2:

[0076] Embodiment 2 of this application provides a vehicle that includes the head-up display system described above.

[0077] By using a head-up display system, ghosting of the head-up display system is suppressed, effectively improving the projection effect of the P-HUD, enhancing the viewing experience for the viewer, and improving the driving safety and comfort of the vehicle.

[0078] In some alternative implementations, the reflector 1 is the windshield of a vehicle.

[0079] The image source 2 in the head-up display system is installed in the front cabin of the vehicle. Since the incident angle of the incident light emitted by the image source 2 is adjusted to the Brewster angle, the arrangement of the image source 2 can be adjusted upwards, so that the image source 2 requires less space in the front cabin and reduces the encroachment of the image source 2 on the front cabin space.

[0080] The shielding component 3 is the outer shell of the instrument panel. The function of the instrument panel 3 is to block the light from the image source 2 that directly enters the human eye 4 and to provide an installation position for the deflection component 5.

[0081] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A head-up display system, characterized in that, include: Image source (2), said image source (2) is used to emit incident light; A reflector (1) is disposed in the optical path of the incident light, and the reflector (1) is used to reflect the incident light and emit reflected light; A deflector (5) is disposed on the optical path of the reflected light and is used to refract and emit the reflected light.

2. The head-up display system as described in claim 1, characterized in that, The deflecting element (5) includes a first glass, a deflecting film, and a second glass, with the deflecting film disposed between the first glass and the second glass.

3. The head-up display system as described in claim 2, characterized in that, At least one surface of the deflection film is wedge-shaped.

4. The head-up display system as described in claim 2, characterized in that, The first glass is a light-transmitting material, and / or the second glass is a light-transmitting material.

5. The head-up display system as described in claim 4, characterized in that, The light-transmitting material is high-transmittance glass or plexiglass.

6. The head-up display system as described in claim 1, characterized in that, Also includes: A shielding member (3) is disposed on the optical path of the reflected light to block part of the reflected light and / or the incident light.

7. The head-up display system as described in claim 6, characterized in that, The deflector (5) is disposed between the shielding member (3) and the reflector (1).

8. The head-up display system according to any one of claims 1-7, characterized in that, The reflector (1) includes a reflective film for reflecting the incident light.

9. The head-up display system according to any one of claims 1-7, characterized in that, The difference between the incident angle and the Brewster angle is less than a preset difference.

10. The head-up display system according to any one of claims 1-7, characterized in that, The optical path of the incident light and the optical path of the reflected light do not overlap at least partially.

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

12. The vehicle as claimed in claim 11, characterized in that, The reflector (1) is the windshield of the vehicle.

Images