Head-up display device and motor vehicle

Abstract

The present invention relates to the field of display technology, and discloses a head-up display device and a motor vehicle, comprising: a housing; an image source and a reflective assembly disposed within the housing; wherein the housing is provided with a light outlet, and the reflective assembly includes a first reflective element, a second reflective element, a third reflective element, and a fourth reflective element; the image source is disposed on a side of the first reflective element away from the light outlet, the second reflective element is disposed on a side of the first reflective element closer to the light outlet, the third reflective element is disposed on a side of the first reflective element closer to the light outlet, and the fourth reflective element is disposed on a side of the first reflective element away from the light outlet; the image source is configured to emit imaging light, and the imaging light reflected by the first reflective element is emitted through the light outlet, so that the light emitted through the light outlet is imaged by an external imaging device. The head-up display device and motor vehicle provided by embodiments of the present invention have the advantages of reducing the size of the head-up display device while ensuring the optical path of the imaging light.

Description

Technical Field

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

[0002] As automobile manufacturing technology matures, more and more high-end vehicles are equipped with advanced automotive electronics, one of which is the Head-Up Display (HUD). HUD is an automotive electronic product based on augmented reality (AR) technology. AR, in simple terms, superimposes computer-generated image information on the human field of view to enhance human perception of the current environment. For example, an AR-based HUD can project images such as vehicle speed and navigation information onto an imaging device such as a projection screen above the windshield or the center console to assist the driver in driving the vehicle. The driver can directly see the image without lowering his head, avoiding the distraction caused by looking down at the dashboard while driving, improving driving safety, and also providing a better driving experience. When in use, the HUD is generally installed inside the vehicle's console.

[0003] However, the inventors of this invention discovered that in order to better position the HUD within the console, it was necessary to limit the volume of the HUD. This reduced volume, however, shortened the optical path of the imaging light before forming an image, preventing distant images from being formed. This severely degraded the user experience. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a head-up display device and a motor vehicle, which can reduce the size of the head-up display device while ensuring the optical path of imaging light.

[0005] To solve the above technical problems, an embodiment of the present invention provides a head-up display device, comprising: a housing; an image source and a reflective assembly disposed within the housing; wherein the housing is provided with a light outlet, and the reflective assembly comprises a first reflective element, a second reflective element, a third reflective element, and a fourth reflective element, the image source being disposed on a side of the first reflective element away from the light outlet, the second reflective element being disposed on a side of the first reflective element close to the light outlet, the third reflective element being disposed on a side of the first reflective element close to the light outlet, and the fourth reflective element being disposed on a side of the first reflective element away from the light outlet, the image source being configured to emit imaging light, the fourth reflective element being configured to reflect the imaging light emitted by the image source, the third reflective element being configured to reflect the imaging light reflected by the fourth reflective element, the imaging light reflected by the third reflective element being irradiated onto the second reflective element, the second reflective element being configured to reflect the imaging light, the first reflective element being configured to reflect the imaging light reflected by the second reflective element, the imaging light reflected by the first reflective element being emitted through the light outlet, so that the light emitted through the light outlet is imaged by an external imaging device.

[0006] An embodiment of the present invention further provides a motor vehicle, comprising: an imaging device and the aforementioned head-up display device, wherein the imaging device is used to image the imaging light emitted through a light outlet.

[0007] Compared with the prior art, the embodiment of the present invention arranges the image source on the side of the first reflecting element away from the light exit port, and the imaging light emitted by the image source is reflected by the fourth reflecting element, the third reflecting element, the second reflecting element and the first reflecting element and then emitted from the light exit port. The optical path of the imaging light is ensured by multiple reflections of four different reflecting elements; in addition, the second reflecting element is arranged on the side of the first reflecting element close to the light exit port, and the image source is arranged on the side of the first reflecting element away from the light exit port. When the required optical path is constant, the space between the image source and the light exit port can be better utilized, thereby improving the space utilization rate and reducing the volume of the head-up display device.

[0008] In addition, the first reflective element is a curved reflective element, the second reflective element is a flat reflective element, the third reflective element is a flat reflective element, and the fourth reflective element is a flat reflective element. Setting the first reflective element as a curved reflective element can magnify the image and provide a longer imaging distance.

[0009] In addition, the second reflective element is a curved reflective element, the first reflective element is a flat reflective element, the third reflective element is a flat reflective element, and the fourth reflective element is a flat reflective element. Setting the second reflective element as a curved reflective element can magnify the image and provide a longer imaging distance.

[0010] In addition, the first reflective element and / or the second reflective element are movably disposed within the housing. By moving the first reflective element and / or the second reflective element, the optical path and imaging position of the imaging light can be changed, thereby meeting more usage needs and expanding the applicability of the head-up display device.

[0011] In addition, the first reflective element is movably disposed in the housing along a first preset direction, and the first preset direction is any direction within an angle formed by the incident principal axis and the reflection principal axis of the first reflective element.

[0012] In addition, the first preset direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the first reflective element.

[0013] In addition, the second reflective element is movably disposed in the housing along a second preset direction, and the second preset direction is any direction within an angle formed by the incident principal axis and the reflection principal axis of the second reflective element.

[0014] In addition, the second preset direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the second reflective element.

[0015] In addition, the image source is movably disposed within the housing. The image source is movably disposed within the bridge body. By moving the image source, the optical path of the imaging light and the imaging position can be changed, thereby meeting more usage needs and expanding the applicability of the head-up display device.

[0016] The device further includes a light shielding element; a sealing member is provided at the light outlet of the housing, and the light shielding element is configured to shield external light directed toward the sealing member along a third predetermined direction. The light shielding element is configured to block external light directed toward the light outlet along the first predetermined direction, thereby preventing the sealing member provided on the light outlet from reflecting external light into the driver's eyes, thereby reducing glare at the light outlet.

[0017] Furthermore, the second reflective element at least partially extends outside the housing to form the shading element. This partially extending second reflective element outside the housing to form the shading element eliminates the need for an additional shading element, simplifying the manufacturing process. Furthermore, a portion of the second reflective element can be disposed outside the housing, further reducing the size of the head-up display device.

[0018] In addition, the image source includes a light source, a backlight assembly and an image generating element; the backlight assembly is used to transmit the light emitted by the light source; and the image generating element is used to convert the light transmitted through the backlight assembly into the imaging light.

[0019] In addition, the backlight assembly includes a reflective light-guiding element, a direction-controlling element, and a diverging element; the reflective light-guiding element is used to collect the light emitted by the light source; the direction-controlling element is used to converge the light after passing through the reflective light-guiding element; and the diverging element is used to diverge the light after converging through the direction-controlling element at a preset angle.

[0020] In addition, the reflective light-guiding element includes a hollow lamp cup; the hollow lamp cup includes a hollow shell surrounded by a reflective wall, the light outlet of the hollow lamp cup faces the direction control element, and the light source is arranged at an end of the hollow lamp cup away from the light outlet. The light emitted by the light source is reflected when it is incident on the reflective wall, so that the light reflected by the reflective wall is emitted through the light outlet to the direction control element.

[0021] In addition, sunglasses are also included, including: the sunglasses are used to transmit P polarized light and block S polarized light.

[0022] Furthermore, a phase delay element is provided between the light outlet and the imaging device. The imaging light emitted through the light outlet is S-polarized light, and the phase delay element is configured to convert the S-polarized light emitted through the light outlet into circularly polarized light or P-polarized light. The phase delay element is provided between the light outlet and the imaging device to convert the S-polarized light emitted from the light outlet into circularly polarized light or P-polarized light. The circularly polarized light has a P-polarized component, thereby enabling drivers and passengers to clearly see the image formed by the head-up display device even when wearing sunglasses.

[0023] In addition, the imaging device is provided with a P-polarized reflective film, and the imaging light emitted through the light outlet is P-polarized light. The P-polarized reflective film on the imaging device can increase the reflectivity of the imaging light in the P-polarized state on the imaging device, thereby improving the clarity of the image on the head-up display device when the driver and passengers are wearing sunglasses.

[0024] In addition, the imaging device is a windshield, and a wedge-shaped film is arranged in the windshield. The wedge-shaped film is arranged in the windshield to eliminate the ghosting of the imaging and improve the clarity of the imaging.

[0025] In addition, a selective reflective film is provided on the imaging device, and the selective reflective film is used to reflect the imaging light. The selective reflective film is provided on the imaging device to reflect the imaging light, thereby preventing the imaging light from forming a secondary image on the imaging device, eliminating the ghosting of the imaging, and improving the clarity of the imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a head-up display device provided by a first embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a head-up display device provided by another embodiment of the present invention;

[0028] Figure 3 1 is a schematic structural diagram of an image source in a head-up display device provided in a first embodiment of the present invention;

[0029] Figure 4 1 is a schematic structural diagram of a backlight assembly in a head-up display device provided in a first embodiment of the present invention;

[0030] Figure 5 1 is a schematic structural diagram of a backlight assembly in a head-up display device provided in a first embodiment of the present invention;

[0031] Figure 6 is a schematic structural diagram of a backlight assembly in a head-up display device provided by another embodiment of the present invention;

[0032] Figure 7 is a schematic structural diagram of a backlight assembly in a head-up display device provided by another embodiment of the present invention;

[0033] Figure 8 is a schematic structural diagram of a head-up display device provided by a second embodiment of the present invention;

[0034] Figure 9 is a schematic structural diagram of a head-up display device provided by a third embodiment of the present invention;

[0035] Figure 10 is a schematic structural diagram of a motor vehicle provided by a fourth embodiment of the present invention;

[0036] Figure 11 It is a schematic structural diagram of a motor vehicle provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to help readers better understand the present application. However, even without these technical details and various variations and modifications based on the following embodiments, the technical solutions claimed in this application can still be implemented.

[0038] The first embodiment of the present invention relates to a head-up display device, the specific structure of which is as follows: Figure 1 As shown, the device comprises: a housing 10 having a light outlet 11 defined therein; an image source 20 and a reflective assembly 30 disposed within the housing 10. The reflective assembly 30 comprises a first reflective element 31, a second reflective element 32, a third reflective element 33, and a fourth reflective element 34. The image source 20 is disposed on a side of the first reflective element 31 away from the light outlet 11, the second reflective element 32 is disposed on a side of the first reflective element 31 closer to the light outlet 11, the third reflective element 33 is disposed on a side of the first reflective element 31 closer to the light outlet 11, and the fourth reflective element 34 is disposed on a side of the first reflective element 31 away from the light outlet 11. The image source 20 is used to emit imaging light to the fourth reflecting element 34, the fourth reflecting element 34 is used to reflect the imaging light emitted by the image source 20, the third reflecting element 33 is used to reflect the imaging light reflected by the fourth reflecting element 34, the imaging light reflected by the third reflecting element 33 is irradiated onto the second reflecting element 32, the second reflecting element 32 is used to reflect the imaging light, the first reflecting element 31 is used to reflect the imaging light reflected by the second reflecting element 32, the imaging light reflected by the first reflecting element 31 is emitted through the light outlet 11, so that the light emitted through the light outlet 11 is imaged by the external imaging device 100 ( Figure 1 20 ′ is the image formed by the image source 20 on the imaging device 100 , that is, the imaging light is reflected to the human eye box area 200 via the external imaging device 100 .

[0039] Compared with the prior art, the head-up display device provided by the first embodiment of the present invention sets the image source 20 on the side of the first reflective element 31 away from the light outlet 11. The imaging light emitted by the image source 20 is reflected by the fourth reflective element 34, the third reflective element 33, the second reflective element 32 and the first reflective element 31 and then emitted from the light outlet 11. The optical path of the imaging light is ensured by multiple reflections of multiple reflective elements; in addition, the second reflective element 32 is set on the side of the first reflective element 31 close to the light outlet 11, and the image source 20 is set on the side of the first reflective element 31 close to the light outlet 11. When the required optical path is constant, the space between the image source 20 and the light outlet 11 can be better utilized, thereby improving the space utilization rate and reducing the volume of the head-up display device.

[0040] It can be understood that the aforementioned reflective assembly 30 including the first reflective element 31, the second reflective element 32, the third reflective element 33 and the fourth reflective element 34 is only a specific embodiment in this embodiment and does not constitute a limitation. In other embodiments of the present invention, other embodiments such as the fifth reflective element and the sixth reflective element may also be included, which are not listed one by one here.

[0041] Specifically, in this embodiment, the first reflective element 31 is a curved reflective element. Setting the first reflective element 31 as a curved reflective element can magnify the image and provide a longer imaging distance. It is understood that the first reflective element 31 being a curved reflective element is only a specific preferred embodiment of this embodiment and does not constitute a limitation. In other embodiments of the present invention, it can also be as follows Figure 2 As shown, the second reflective element 32 is configured as a curved reflective element. This configuration can also amplify the image and provide a longer imaging distance. Furthermore, other embodiments are possible in which both the first reflective element 31 and the second reflective element 32 are curved reflective elements. These embodiments are not listed here, and can be flexibly configured based on actual needs.

[0042] Furthermore, in this embodiment, the first reflective element 31 is movably disposed within the housing 10. For example, a guide rail is provided, and a slider is movably disposed on the guide rail. The first reflective element 31 is fixed to the slider, thereby achieving the movability of the first reflective element 31 within the housing 10. It will be understood that the use of a guide rail and a slider to movably dispose the first reflective element 31 within the housing 10 is merely an example of a specific implementation method and does not constitute a limitation. In actual production, the first reflective element 31 can also be movably disposed within the housing 10 through other methods, such as motor drive, electromagnetic drive, etc. The first reflective element 31 is movably disposed within the housing 10. By moving the first reflective element 31, the optical path and imaging position of the imaging light can be changed, thereby meeting more usage needs and expanding the applicability of the head-up display device. It can be understood that the aforementioned first reflecting element 31 being movably arranged in the housing 10 is only a specific example in this embodiment and does not constitute a limitation. In actual production and use, the second reflecting element 32 can also be movably arranged in the housing 10, or the first reflecting element 31 and the second reflecting element 32 can both be movably arranged in the housing 10, or the third reflecting element 33, the fourth reflecting element 34 and other reflecting elements can be movably arranged in the housing 10. They are not listed one by one here, and can be flexibly arranged according to actual needs.

[0043] Specifically, in this embodiment, if Figure 1 As shown, the first reflective element 31 is movably arranged in the housing 10 along a first preset direction. The first preset direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the first reflective element 31. The incident principal axis is the centerline of the incident light beam, and the reflection principal axis is the centerline of the reflected light beam. It can be understood that the aforementioned first preset direction being the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the first reflective element 31 is only a specific example in this embodiment and does not constitute a limitation. In other embodiments of the present invention, the first preset direction can also be any direction within the angle formed by the incident principal axis and the reflection principal axis of the first reflective element 31, and can be flexibly set according to actual needs.

[0044] It should be understood that the aforementioned movably disposed first reflective element 31 within the housing 10 is merely an example of a specific embodiment in this embodiment and does not constitute a limitation. In other embodiments of the present invention, the first reflective element 31 may be fixedly disposed within the housing 10, and the second reflective element 32 may be movably disposed within the housing 10 along a second predetermined direction, or both the first reflective element 31 and the second reflective element 32 may be movably disposed within the housing 10. The arrangement can be flexibly configured according to actual needs. The second predetermined direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the second reflective element 32. The incident principal axis is the centerline of the incident light beam, and the reflection principal axis is the centerline of the reflected light beam. It should be understood that the aforementioned second predetermined direction being the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the second reflective element 32 is merely an example of a specific embodiment in this embodiment and does not constitute a limitation. In other embodiments of the present invention, the second predetermined direction may also be any direction within the angle formed by the incident principal axis and the reflection principal axis of the second reflective element 32. The arrangement can be flexibly configured according to actual needs.

[0045] Furthermore, in this embodiment, the image source 20 is movably disposed within the housing 10. For example, a guide rail is provided, and a slider is movably disposed on the guide rail. The image source 20 and the slider are fixed to each other, thereby achieving the movable placement of the image source 20 within the housing 10. It should be understood that the use of a guide rail and a slider to achieve the movable placement of the image source 20 within the housing 10 is merely an example of a specific implementation method and does not constitute a limitation. In actual production, the image source 20 can also be movably disposed within the housing 10 through other methods, such as motor drive or electromagnetic drive. The movable placement of the image source 20 within the housing 10 allows the optical path of the imaging light and the position of the image to be changed by moving the image source 20, thereby meeting more application needs and expanding the applicability of the head-up display device.

[0046] Specifically, in this embodiment, the image source 20 extends along the main axis of the imaging light ( Figure 1 The image source 20 is movably disposed in the housing 10 along the main axis of the imaging light. It should be understood that the aforementioned arrangement of the image source 20 movably disposed in the housing 10 along the main axis of the imaging light is merely an example of this embodiment and does not constitute a limitation. In other embodiments of the present invention, the image source 20 may be movably disposed in other directions within the housing 10. The arrangement can be flexibly adjusted according to actual needs.

[0047] Specifically, in this embodiment, if Figure 3 、 Figure 4 As shown, the image source 20 includes a light source 21 for generating light, a backlight assembly 22 for transmitting the light emitted by the light source 21, and an image generating element 23 for converting the light transmitted through the backlight assembly 22 into imaging light. The backlight assembly 22 may include a reflective light guide element 221, a direction control element 222, and a diverging element 223, which are sequentially arranged on the light-emitting side of the light source 21. The reflective light guide element 221 is used to collect the light emitted by the light source 21 and transmit the collected light to the direction control element 222. The direction control element 222 is used to converge the light collected by the reflective light guide element and transmit the converged light to the diverging element 223. The diverging element 223 is used to diverge the light converged by the direction control element 222 at a preset angle and transmit the diverging light to the image generating element 23. Specifically, the reflective light guide element 221 is arranged on the light exit side of the light source 21 , the direction control element 222 is arranged on the light exit side of the reflective light guide element 221 and is located on the light exit side of the reflective light guide element 221 , and the diverging element 223 is arranged on the light exit side of the reflective light guide element 221 .

[0048] The light source 21 is used to generate light and may include at least one electroluminescent element that generates light through electric field excitation, such as a light emitting diode (LED), an organic light-emitting diode (OLED), a mini LED, a micro LED, a cold cathode fluorescent lamp (CCFL), a cold LED light source 21 (Cold LED Light, CLL), an electroluminescent (EL), an electron emission (FED), or a quantum dot light source 21 (QD). The image generating element 23 includes a liquid crystal panel that can convert the light emitted by the light source 21 into image light.

[0049] like Figure 4 As shown, in this embodiment, the reflective light-guiding element 221 is a hollow lamp cup, which includes a hollow shell surrounded by a reflective wall 2211. The hollow shell includes a light-emitting opening 2212, which is arranged toward the direction-controlling element 222. The light source 21 is arranged at an end of the hollow lamp cup away from the light-emitting opening 2212. When the light emitted by the light source 21 is incident on the reflective wall 2211, it is reflected so that the light reflected by the reflective wall is emitted through the light-emitting opening 2212 to the direction-controlling element 222. In other words, among the light emitted by the light source 21, the light emitted toward the light-emitting opening 2212 directly illuminates the direction-controlling element 222, while the light emitted toward the reflective wall 2211 is reflected by the reflective wall 2211 and then illuminates the direction-controlling element 222 from the light-emitting opening 2212, thereby improving the utilization rate of the light from the light source 21.

[0050] It should be noted that the shape of the reflective light guide element 221 can be a triangular pyramid, a quadrangular pyramid or a paraboloid (similar to a bowl shape). Figure 5 As shown, the outer shape of the reflective light-guiding element 221 is a quadrangular pyramid. The shape of the light-emitting opening 2212 and the bottom of the reflective light-guiding element 221 can be circular, elliptical, rectangular, square, trapezoidal or parallelogram. The shapes of the light-emitting opening 2212 and the bottom can be the same or different.

[0051] The direction control element 222 is arranged at the light outlet opening 2212, that is, the direction control element 222 can be close to the light outlet opening 2212 or maintain a certain distance from the light outlet opening 2212. The direction control element 222 controls the direction of the light emitted by the reflective light guide element 221, and gathers the light into a predetermined range, which can further gather the light and improve the light utilization rate. The direction control element 222 can be a lens or a lens combination, such as a convex lens, a Fresnel lens or a lens combination. In this embodiment, the direction control element 222 is a convex lens. It can be understood that the predetermined range can be a point, such as the focus of a convex lens, or a smaller area. The purpose of setting the direction control element 222 is to gather the large-angle light emitted by the light source 21 and improve the light utilization rate.

[0052] The diverging element 223 diffuses the light into a beam with a certain distribution angle. The smaller the diffusion angle, the higher the brightness of the light beam, and vice versa. The diverging element 223 diffuses the gathered light at a certain angle, increases the diffusion degree of the light, and can evenly distribute the light in a certain area. The diverging element 223 can be a diffraction optical element, such as a beam shaping element (beam shper). After the light passes through the diverging element 223, it will diffuse and form a light beam with a specific cross-sectional shape, and the cross-sectional shape includes but is not limited to linear, circular, elliptical, square or rectangular. By controlling the microstructure of the diverging element 223, the diffusion angle and cross-sectional shape of the light can be precisely controlled, thereby achieving precise control of the diffusion effect.

[0053] It should be noted that the reflective light guide element 221 is not limited to the aforementioned hollow lamp cup structure, and may also be other structures. Figure 6As shown, the light guide element is a solid light-transmitting component with a refractive index greater than 1. It includes a light-emitting surface 2213, a light-reflecting surface 2214, and a light source receiving groove 2215. The light-emitting surface 2213 is adjacent to the direction-controlling element 222. The light-reflecting surface 2214 extends from the periphery of the light-emitting surface 2213 in a direction away from the direction-controlling element 222 (not shown). The light source receiving groove 2215 is located on the side of the light-reflecting surface 2214 facing away from the light-emitting surface 2213 and is recessed from the edge of the light-reflecting surface 2214 on that side toward the side closer to the light-emitting surface 2213. The light source receiving groove 2215 includes a bottom wall 2215a disposed opposite the light-emitting surface 2213 and side walls connecting the periphery of the bottom wall 2215a to the light-reflecting surface 2214. The bottom wall 2215a and the side walls serve as the light-incident surfaces of the light guide element. Thus, the light source 21 is disposed within the light source receiving groove 2215 and faces the bottom wall 2215a of the light source receiving groove 2215. The bottom wall 2215a is a convex surface that protrudes away from the light-emitting surface 2213. This convex surface is used to receive light emitted by the light source 21 with a relatively small divergence angle and convert it into collimated light when it enters through the convex surface. Collimated light refers to light with a very small or almost zero divergence angle, and is parallel or nearly parallel. When collimated light enters the image generating element 23, the light is more consistent, which is more conducive to the conversion of light into an image.

[0054] Preferably, after the bottom wall 2215a converts the incident light into collimated light, the collimated light is perpendicular to the light-emitting surface 2213. Of course, it is understandable that the light incident through the bottom wall 2215a, after being converted into collimated light, is not necessarily perpendicular to the light-emitting surface 2213, and may also form a specific angle (between 0 degrees and 90 degrees) with the light-emitting surface 2213 based on specific considerations. It should be noted that the light-reflecting surface 2214 is the inner surface of the light-guiding element. Since the refractive index of the light-guiding element is greater than 1, after the large-angle light emitted by the light source 21 is incident on the light-reflecting surface 2214 through the side wall, the light that meets the total reflection condition will be totally reflected on the light-reflecting surface 2214 of the light-guiding element and emerge through the light-emitting surface 2213. The small-angle light emitted by the light source 21 is incident on the light-guiding element through the bottom wall 2215a, but does not enter the light-reflecting surface 2214, but directly enters the light-emitting surface 2213 and emerges through the light-emitting surface 2213.

[0055] It should be noted that, in this embodiment, the bottom wall 2215a is set to a convex surface, so that the convex bottom wall 2215a is used to form a plano-convex lens structure, which plays a role in adjusting the small-angle light line to a collimated light line. Figure 6Here, only a plano-convex lens formed by a convex surface is used as an example for illustration. In other modified implementation schemes, this convex surface can also be used to form a collimating lens with a light collimating function, such as a Fresnel lens or a lens combination, and the convex surface can be set separately and installed on a solid light-transmitting member, or it can be formed integrally with the solid light-transmitting member. The shape of the light-reflecting surface 2214 includes a curved surface shape, such as a parabolic shape, a free-form surface shape or a conical surface shape, etc. Such a setting can effectively increase the incident angle of the aforementioned large-angle light incident on the light-reflecting surface 2214, thereby making it easier to meet the critical condition of total reflection of light propagation, so as to maximize the guarantee that as much light as possible is reflected by the light-reflecting surface 2214 to the light-emitting surface 2213 and emitted for imaging, thereby improving the light utilization efficiency. In addition, the bottom wall 2215a of the light source receiving groove 2215 is not limited to the aforementioned convex structure, and it can also be other structures, as long as it can ensure that "the light incident on the light-guiding element is converted into collimated light and emitted from the light-guiding element". For example Figure 7 As shown, the light-emitting surface 2213 is provided with a blind hole 2216 recessed toward the bottom wall 2215a. The bottom surface 2216a of the blind hole 2216 is a convex surface that protrudes toward the side of the light-emitting surface 2213. This convex surface is used to emit light incident through the bottom wall 2215a and convert the light into collimated light when it is emitted through the convex surface. The specific implementation of the convex surface is similar to that of the convex surface of the bottom wall 2215a in the above-mentioned embodiment and will not be repeated here. Under this configuration, the bottom wall 2215a is a plane parallel to the light-emitting surface 2213. Of course, there are many other possible design solutions for the shape of the bottom wall 2215a, which will not be repeated here.

[0056] A second embodiment of the present invention relates to a head-up display device. Figure 8 As shown, the second embodiment is substantially the same as the first embodiment, both comprising a housing 10, an image source 20, and a reflective assembly 30. The main difference is that this embodiment further comprises a light shielding element 40 and a sealing member 50. The sealing member 50 is disposed at the light outlet 11, and the light shielding element 40 is disposed on the housing 10 to shield external light directed toward the sealing member 50 along a third predetermined direction A.

[0057] Specifically, in this embodiment, the third preset direction A is the direction of external light. For example, when the vehicle is driving against the sunlight, the sunlight directly shines on the sealing member 50 from the front windshield, and then forms a mirror reflection on the surface of the sealing member 50, forming a glare spot in the driver's eyes, affecting the driver's normal driving. At this time, the first preset direction is the direction of sunlight shining on the front windshield of the vehicle.

[0058] Compared with the prior art, the head-up display device provided by the second embodiment of the present invention retains all the technical effects of the first embodiment while providing a sealing member 50 on the light outlet 11, which can effectively prevent external dust and impurities from entering the interior of the head-up display device, thereby improving the reliability of the head-up display device; in addition, a shading element 40 is provided on the outer shell 10 to block sunlight irradiated onto the sealing member 50 along a third preset direction, which can effectively prevent the sealing member 50 from directly reflecting sunlight into the human eye, thereby eliminating the highlight area that may be formed on the sealing member 50 by sunlight.

[0059] Preferably, in this embodiment, the shading element 40 is movably disposed on the housing 10. The shading element 40 is movably disposed on the housing 10 so that it can be adjusted accordingly according to the incident direction of external light, thereby better blocking external light and further preventing external light from forming a highlight area on the sealing member 50. For example, an annular guide rail is provided around the light outlet 11, a slider is movably provided on the annular guide rail, and the shading element 40 is fixed to the slider. It will be understood that the foregoing is merely an example of a specific implementation method for movably disposing the shading element 40 on the housing 10 in this embodiment and does not constitute a limitation.

[0060] A third embodiment of the present invention relates to a head-up display device. Figure 9 As shown, the third embodiment is substantially the same as the second embodiment, both comprising a housing 10 , an image source 20 , a reflective assembly 30 , and a sealing member 50 ; the main difference is that in this embodiment, a portion of the second reflective element 32 extends to the outside of the housing 10 to form a shading element 40 .

[0061] Compared with the prior art, the head-up display device provided in the third embodiment of the present invention retains all the technical effects of the first embodiment while configuring the second reflective element 32 to partially extend outside the housing 10 to form a shading element 40, thereby eliminating the strong light area and further reducing the volume of the head-up display device.

[0062] A fourth embodiment of the present invention provides a motor vehicle, such as Figure 10 As shown, it includes an imaging device 100 and the head-up display device provided in the first embodiment, wherein the imaging device 100 is used to image the imaging light emitted through the light outlet 11. The head-up display device includes a housing 10, a light outlet 11, an image source 20, and a reflective component 30.

[0063] After the imaging light emitted by the image source 20 is projected onto the imaging device 100, it is reflected toward the area where the driver's eyes are located (i.e., the eye box area 200), so that the driver can see the HUD image. It should be noted that the eye box area 200 has a certain size. The driver's eyes can move a certain distance relative to the center of the eye box area 200, such as up and down, left and right. As long as they are still within the eye box area, they can still see the HUD image. Figure 4 The diverging element 223 shown in FIG. 1 is used in this embodiment to precisely diffuse light, ensuring that the diffused light beam, after reflection from the reflective assembly 30 and the imaging device 100, covers the eyebox area. In this embodiment, this area is precisely covered, achieving high light efficiency while not affecting normal observation. It is understood that the diffused light beam can be larger than the eyebox area, as long as it completely covers the eyebox. Preferably, after the diverging element 223 is provided, the diffused light beam precisely covers the eyebox area, achieving the highest system light efficiency.

[0064] In this embodiment, the imaging device 100 can be a car's windshield. Because the windshield has a high reflectivity for S-polarized light, the light emitted by the image source 20, which includes a backlight module and an imaging module, is generally S-polarized light. For example, the image source 20 is an LCD (liquid crystal display) module that emits S-polarized light. However, when the driver wears sunglasses, the sunglasses filter S-polarized light, that is, they block S-polarized light and transmit light with other polarization characteristics. Therefore, the HUD image may not be visible when wearing sunglasses. Therefore, preferably, a phase delay element 300, such as a 1 / 4 wave plate, can be provided between the light outlet 11 and the windshield (i.e., the imaging device 100) to convert the S-polarized imaging light into circularly polarized light, generating a P-polarized light component. In this way, the driver can still see the HUD image when wearing sunglasses. Of course, the phase delay element 300 is not limited to being disposed between the windshield and the light outlet 11, and can also be disposed at any other position in the optical path of the imaging light, such as: a. being disposed between the first reflective element 31 and the light outlet 11; b. being disposed on a side surface of the sealing member 50 close to the first reflective element 31, etc. It is understandable that if the image source 20 is adjusted to emit P-polarized imaging light, the phase delay element 300 can be omitted to ensure that the driver can see the image when wearing sunglasses. However, since the windshield has a very low reflectivity for P-polarized light, Figure 10As shown, a P-polarized reflective film 400 can be installed on the windshield (i.e., imaging device 100) to enhance the reflection of P-polarized light and improve image clarity. Furthermore, after some imaging light passes through the P-polarized reflective film 400, due to the windshield's high transmittance for P-polarized light, the transmitted P-polarized light will also pass through the windshield (i.e., imaging device 100). The reflectivity of the inner surface of the windshield (i.e., imaging device 100) is very low, thereby eliminating ghosting.

[0065] In addition, it can be understood that the head-up display device included in the motor vehicle provided in the fourth embodiment of the present invention can also be replaced by the head-up display device provided in any one of the second and third embodiments.

[0066] It should be noted that when the transflective device is a windshield, since the windshield is generally a curved surface, the position of the virtual image formed by the image source 20 after reflection by the curved reflective element is located at the focal plane of the windshield, or at a position less than one focal length of the windshield and close to the focal plane of the windshield. In this case, according to the law of curved surface imaging, the virtual image ( Figure 10 The image (shown as the dotted rectangle in the middle) will be formed at a farther distance or even infinity, such as 20 meters, 30 meters, 50 meters, or even infinity, which is suitable for AR-HUD use and has a better enhanced display fit with the real scene outside the car.

[0067] Preferably, when the imaging device 100 is a windshield, a wedge-shaped film may be added to the interlayer of the imaging device 100 to eliminate ghosting.

[0068] In addition, a selective reflective film may be added to the imaging device 100, such as the inner surface (the surface of the windshield facing the reflective element). The selective reflective film only reflects the imaging light emitted by the image source 20. If the imaging light includes light in three bands of RGB, the selective reflective film only reflects the RGB light and transmits other light. The imaging light will not be reflected twice on the inner surface of the outer side of the windshield (the side of the windshield facing away from the reflective element), thereby eliminating ghosting.

[0069] Furthermore, a half-wave plate or a quarter-wave plate can be added to the inner surface of the windshield to work with an image source 20 that emits S-polarized light. After the S-polarized imaging light is reflected by the reflective film, the transmitted light is converted to circularly polarized light or P-polarized light by the wave plate. The reflectivity on the inner surface of the windshield is very low, thereby eliminating ghosting. Furthermore, a P-polarized light reflective film can be added to the inner surface of the windshield to work with an image source 20 that emits P-polarized light. After the P-polarized imaging light is reflected by the reflective film, the transmitted P-polarized light will also pass through the windshield due to the glass's high transmittance for P-polarized light. The reflectivity on the inner surface of the windshield is very low, thereby eliminating ghosting.

[0070] It is not difficult to see that this embodiment is a motor vehicle embodiment corresponding to the aforementioned embodiment of the head-up display device, and this embodiment can be implemented in conjunction with the aforementioned embodiment of the head-up display device. The relevant technical details mentioned in the aforementioned embodiment of the head-up display device are still applicable to this embodiment and will not be repeated here to reduce repetition. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the aforementioned embodiment of the head-up display device.

[0071] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiments can be implemented by instructing related hardware through a program, which is stored in a storage medium and includes a number of instructions for causing a device (which may be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., various media that can store program code.

[0072] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A head-up display device, characterized in that: include: shell; An image source and a reflective component disposed within the housing; Wherein, a light outlet is provided on the housing, and the reflective assembly includes a first reflective element, a second reflective element, a third reflective element and a fourth reflective element. The image source is provided on a side of the first reflective element away from the light outlet, the second reflective element is provided on a side of the first reflective element close to the light outlet, the third reflective element is provided on a side of the first reflective element close to the light outlet, and the fourth reflective element is provided on a side of the first reflective element away from the light outlet. The image source is used to emit imaging light, the fourth reflective element is used to reflect the imaging light emitted by the image source, the third reflective element is used to reflect the imaging light reflected by the fourth reflective element, and the imaging light reflected by the third reflective element is irradiated onto the second reflective element, the second reflective element is used to reflect the imaging light, the first reflective element is used to reflect the imaging light reflected by the second reflective element, and the imaging light reflected by the first reflective element is emitted through the light outlet, so that the light emitted through the light outlet is imaged by an external imaging device; The head-up display device further includes a guide rail and a slider movably arranged on the guide rail, and the first reflective element or the second reflective element is fixed to the slider; or the head-up display device further includes a motor or an electromagnetic module; By driving the slider on the guide rail, driving the motor or driving the electromagnetic module, the first reflective element and / or the second reflective element are driven to be movably disposed in the housing to change the optical path of the imaging light and the imaging position; The second reflective element at least partially extends outside the shell to form a shading element. A sealing member is provided at the light outlet of the shell. The shading element is used to block external light emitted toward the sealing member along a third preset direction to prevent the sealing member from directly reflecting the external light into the human eye.

2. The head-up display device according to claim 1, characterized in that: Also includes: The first reflective element is a curved reflective element, the second reflective element is a flat reflective element, the third reflective element is a flat reflective element, and the fourth reflective element is a flat reflective element.

3. The head-up display device according to claim 1, characterized in that: Also includes: The second reflective element is a curved reflective element, the first reflective element is a flat reflective element, the third reflective element is a flat reflective element, and the fourth reflective element is a flat reflective element.

4. The head-up display device according to claim 1, characterized in that: The first reflective element is movably disposed in the housing along a first preset direction, and the first preset direction is any direction within an angle formed by an incident principal axis and a reflection principal axis of the first reflective element.

5. The head-up display device according to claim 4, characterized in that: The first preset direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the first reflective element.

6. The head-up display device according to claim 1, characterized in that: The second reflective element is movably disposed in the housing along a second preset direction, and the second preset direction is any direction within an angle formed by an incident principal axis and a reflection principal axis of the second reflective element.

7. The head-up display device according to claim 6, characterized in that: The second preset direction is the direction of the bisector of the angle formed by the incident principal axis and the reflection principal axis of the second reflective element.

8. The head-up display device according to claim 1, wherein: The image source is movably arranged in the housing.

9. The head-up display device according to claim 1, characterized in that: The image source includes a light source, a backlight assembly and an image generating element; The backlight assembly is used to transmit the light emitted by the light source; The image generating element is used to convert the light transmitted through the backlight assembly into the imaging light.

10. The head-up display device according to claim 9, characterized in that: The backlight assembly includes a reflective light guide element, a direction control element and a diverging element; The reflective light-guiding element is used to collect the light emitted by the light source; The direction control element is used to converge the light collected by the reflective light guide component; The diverging element is used to diverge the light converged by the direction control element at a preset angle.

11. The head-up display device according to claim 10, characterized in that: The reflective light guide element includes a hollow lamp cup; The hollow lamp cup includes a hollow shell surrounded by a reflective wall, the light outlet opening of the hollow lamp cup faces the direction control element, and the light source is arranged at an end of the hollow lamp cup away from the light outlet opening. The light emitted by the light source is reflected when it is incident on the reflective wall, so that the light reflected by the reflective wall is emitted through the light outlet opening to the direction control element.

12. A motor vehicle, characterized in that: include: An imaging device and a head-up display device according to any one of claims 1 to 11, wherein the imaging device is used to image the imaging light emitted through the light outlet.

13. The motor vehicle according to claim 12, characterized in that Also included are sunglasses, characterized in that: the sunglasses are used to transmit P-polarized light and block S-polarized light.

14. The motor vehicle according to claim 13, characterized in that It also includes a phase delay element arranged between the light outlet and the imaging device. The imaging light emitted through the light outlet is S-polarized light. The phase delay element is used to convert the S-polarized light emitted through the light outlet into circularly polarized light or P-polarized light.

15. The motor vehicle according to claim 13, characterized in that The imaging device is provided with a P-polarized reflective film, and the imaging light emitted through the light outlet is P-polarized light.

16. The motor vehicle according to claim 12, characterized in that The imaging device is a windshield, and a wedge-shaped film is arranged inside the windshield.

17. The motor vehicle according to claim 12, wherein: It also includes a selective reflection film arranged on the imaging device, and the selective reflection film is used to reflect the imaging light.

Images