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; a first image source, a transflective mirror, a first reflector, a second reflector, and a third reflector disposed within the housing; wherein the housing is provided with a light outlet, the first image source is disposed on a side of the transflective mirror away from the light outlet, the first reflector and the third reflector are disposed on a side of the transflective mirror closer to the light outlet, the first image source is configured to emit first image light, the first image light being emitted to the transflective mirror, the light transmitted through the transflective mirror being emitted to the first reflector, the light reflected through the first reflector being emitted to the transflective mirror, the light reflected through the transflective mirror being emitted to the second reflector, the light reflected through the second reflector being emitted to the third reflector, and the light reflected through the third reflector being emitted through the light outlet. The head-up display device and motor vehicle provided by embodiments of the present invention have the advantage of reducing the size of the head-up display device.

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] HUD (head up display) uses the car windshield to form an image (virtual image), allowing the head up display to project an image containing instrument panel information. While the driver is viewing the real environment outside the windshield, he can also view the image of the head up display, thus avoiding the distraction caused by looking down at the instrument panel while driving, improving driving safety and providing a better driving experience.

[0003] However, the inventors of the present invention have discovered that there are applications in the prior art that overlap the HUD virtual image with the real scene, such as a real road scene, for display. Since this application method of the real road scene requires the HUD virtual image to be imaged at a farther position, the image light must have a longer optical path. The increase in the optical path leads to an increase in the volume of the HUD, which increases the difficulty of installing the HUD and reduces the scope of application of the HUD. Summary of the Invention

[0004] An object 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 image light.

[0005] To solve the above technical problems, an embodiment of the present invention provides a head-up display device, comprising: a housing; a first image source and a reflective structure arranged in the housing; wherein the housing is provided with a light outlet, the reflective structure includes a transflective mirror, a first reflective mirror, a second reflective mirror, and a third reflective mirror, the first reflective mirror being a plane reflective mirror, the first image source being provided on a side of the transflective mirror away from the light outlet, the first reflective mirror and the third reflective mirror being provided on a side of the transflective mirror close to the light outlet, the first image source being used to emit a first image light, the transflective mirror allowing both light reflection and light transmission, the first image light emitted by the first image source being emitted to the transflective mirror, the light transmitted through the transflective mirror being emitted to the first reflective mirror for reflection, the light reflected through the first reflective mirror being emitted to the transflective mirror, the light reflected through the transflective mirror being emitted to the second reflective mirror, the light reflected through the second reflective mirror being emitted to the third reflective mirror, and the light reflected through the third reflective mirror 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 image light emitted through a light outlet.

[0007] Compared with the prior art, the embodiment of the present invention sets the first image source on the side of the transflective mirror away from the light outlet. The first image light emitted by the first image source can be transmitted through the transflective mirror and then reflected multiple times between the first reflector, the transflective mirror, the second reflector and the third reflector to be emitted from the light outlet, thereby ensuring the optical path of the image light. In addition, the image source is set on the side of the transflective mirror away from the light outlet. When the required optical path is constant, the space between the image source and the light outlet can be better utilized, thereby improving space utilization and reducing the volume of the head-up display device.

[0008] In addition, it also includes: a second image source, the second image source is used to emit second image light, the second image source is located on the side of the transflective mirror away from the light outlet; the second image light is emitted to the transflective mirror, the light transmitted through the transflective mirror is emitted to the second reflector, the light reflected through the second reflector is emitted to the third reflector, and the light reflected through the third reflector is emitted through the light outlet, so that the light emitted through the light outlet is imaged by an external imaging device.

[0009] In addition, the second image light is transmitted through the reflective mirror and overlaps with the first image light. The first image light is transmitted through the reflective mirror and overlaps with the second image light, thereby increasing the intensity of the image light and making the image clearer.

[0010] In addition, a light characteristic conversion element is provided between the first reflector and the transflective mirror, the transflective mirror is used to transmit light with a first characteristic and reflect light with other characteristics, and the light characteristic conversion element is used to convert the characteristics of the transmitted light; the first image light is emitted to the transflective mirror, the light with the first characteristic in the first image light is transmitted to the light characteristic conversion element, the light with the first characteristic is converted into light with a second characteristic after passing through the light characteristic conversion element and is emitted to the first reflector, the light with the second characteristic reflected by the first reflector is emitted to the light characteristic conversion element, the light with the second characteristic is converted into light with a third characteristic after passing through the light characteristic conversion element and is emitted to the transflective mirror, and the light reflected by the transflective mirror is emitted to the second reflector; wherein, the first characteristic, the second characteristic and the third characteristic are all different.

[0011] In addition, a light characteristic conversion element is provided between the first reflector and the transflective mirror, the transflective mirror being configured to transmit light with a first characteristic and reflect light with other characteristics, the light characteristic conversion element being configured to convert the characteristics of the transmitted light; the first image light is emitted to the transflective mirror, the light with the first characteristic in the first image light is transmitted to the light characteristic conversion element, the light with the first characteristic is transmitted through the light characteristic conversion element and converted into light with a second characteristic and emitted to the first reflector, the light with the second characteristic reflected by the first reflector is emitted to the light characteristic conversion element, the light with the second characteristic is transmitted through the light characteristic conversion element and converted into light with a third characteristic and emitted to the transflective mirror, the light with the third characteristic reflected by the transflective mirror is emitted to the light characteristic conversion element, the light with the third characteristic is transmitted through the light characteristic conversion element and converted into light with a fourth characteristic and emitted to the second reflector; wherein the first characteristic, the second characteristic, the third characteristic and the fourth characteristic are all different.

[0012] In addition, the optical characteristic conversion element is a wave plate.

[0013] In addition, the second reflector is a curved reflector, and the third reflector is a flat reflector. Setting the second reflector as a curved reflector can magnify the image and provide a longer imaging distance.

[0014] In addition, the first reflector and / or the second reflector and / or the third reflector and / or the transflective mirror are movably disposed within the housing. The first reflector and / or the second reflector and / or the third reflector and / or the transflective mirror are movably disposed within the housing or movably disposed within the bridge body. By moving the first reflector and / or the second reflector and / or the third reflector and / or the transflective mirror, the optical path of the image light and the position of the image can be changed, thereby meeting more usage needs and expanding the applicability of the head-up display device.

[0015] In addition, the first reflector is movably arranged in the housing along a first preset direction, and the first preset direction is any direction within the angle formed by the incident principal axis and the reflection principal axis of the first reflector.

[0016] 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 reflector.

[0017] In addition, the transflective mirror is movably arranged in the housing along a second preset direction, and the second preset direction is any direction within the angle formed by the incident principal axis and the reflection principal axis of the transflective mirror.

[0018] 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 transflective mirror.

[0019] 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 image light and the imaging position can be changed, thereby meeting more usage needs and expanding the applicability of the head-up display device.

[0020] The light-shielding portion further includes a sealing member disposed at the light outlet of the housing, the sealing member being configured to block external light directed toward the sealing member in a third predetermined direction. The light-shielding portion blocks external light directed toward the light outlet in the first predetermined direction, thereby preventing the sealing member disposed on the light outlet from reflecting external light into the driver's eyes, thereby reducing glare at the light outlet.

[0021] In addition, the second reflector at least partially extends outside the housing to form the light shielding portion. This partially extending second reflector outside the housing to form the light shielding portion eliminates the need for an additional light shielding portion, simplifying the manufacturing process. Furthermore, a portion of the second reflector can be disposed outside the housing, further reducing the size of the head-up display device.

[0022] 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 image light.

[0023] In addition, the backlight assembly includes a reflective light-guiding element, a direction control element and a diffusion 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 after passing through the reflective light-guiding element; and the diffusion element is used to diverge the light converged by the direction control element at a preset angle.

[0024] 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.

[0025] In addition, sunglasses are also included, including: the sunglasses are used to transmit light in the P polarization state and block light in other states.

[0026] The system also includes a phase delay element disposed between the light outlet and the imaging device. The image 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. The phase delay element is disposed between the light outlet and the imaging device to convert the S-polarized light emitted from the light outlet into circularly 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.

[0027] In addition, the imaging device is provided with a P-polarized reflective film, and the image 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 P-polarized image light on the imaging device, thereby improving the clarity of the image on the head-up display when the driver and passengers are wearing sunglasses.

[0028] 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.

[0029] The imaging device further includes a selective reflective film disposed on the imaging device, the selective reflective film being used to reflect the image light. The selective reflective film is disposed on the imaging device to reflect the image light, thereby preventing the image light from forming a secondary image on the imaging device, eliminating ghosting, and improving image clarity. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 2 is a schematic structural diagram of an image source in a head-up display device provided in a first embodiment of the present invention;

[0032] Figure 3 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;

[0033] 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;

[0034] Figure 5 is a schematic structural diagram of a backlight assembly in a head-up display device provided in another embodiment of the present invention;

[0035] Figure 6 is a schematic structural diagram of a backlight assembly in a head-up display device provided in another embodiment of the present invention;

[0036] Figure 7is a schematic structural diagram of a head-up display device provided by a second embodiment of the present invention;

[0037] Figure 8 is a schematic structural diagram of a head-up display device provided by a third embodiment of the present invention;

[0038] Figure 9 is a schematic structural diagram of a head-up display device provided by a fourth embodiment of the present invention;

[0039] Figure 10 is a schematic structural diagram of a head-up display device provided by a fifth embodiment of the present invention;

[0040] Figure 11 is a structural schematic diagram of a head-up display device provided by another embodiment of the present invention;

[0041] Figure 12 is a schematic structural diagram of a motor vehicle provided by a sixth embodiment of the present invention;

[0042] Figure 13 It is a schematic structural diagram of a motor vehicle provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] The first embodiment of the present invention relates to a head-up display device, the specific structure of which is as follows: Figure 1As shown, it includes: a shell 10; a first image source 20 and a reflective structure 30 arranged in the shell 10; wherein, a light outlet 11 is provided on the shell 10, and the reflective structure 30 includes a transflective mirror 31, a first reflective mirror 32, a second reflective mirror 33 and a third reflective mirror 34, the first reflective mirror 32 is a plane reflective mirror, the first image source 20 is arranged on the side of the transflective mirror 31 away from the light outlet 11, and the first reflective mirror 32 and the third reflective mirror 34 are arranged on the side of the transflective mirror 31 close to the light outlet 11. The first image source 20 is used to emit first image light, and the transflective mirror 31 allows light to be reflected and transmitted. The first image light emitted by the first image source 20 is emitted to the transflective mirror 31, and the light transmitted through the transflective mirror 31 is emitted to the first reflective mirror 32 for reflection. The light reflected by the first reflective mirror 32 is emitted to the transflective mirror 31, and the light reflected by the transflective mirror 31 is emitted to the second reflective mirror 33. The light reflected by the second reflective mirror 33 is emitted to the third reflective mirror 34. The light reflected by the third reflective mirror 34 is emitted through the light outlet 11, so that the light emitted through the light outlet 11 is imaged by an external imaging device.

[0045] Compared with the prior art, the head-up display device provided in the first embodiment of the present invention disposes the first image source 20 on the side of the transflective mirror 31 away from the light outlet 11. The first image light emitted by the first image source 20 can be transmitted through the transflective mirror 31 and then reflected multiple times between the first reflector 32, the transflective mirror 31, the second reflector 33 and the third reflector 34 to be emitted from the light outlet 11, thereby ensuring the optical path of the image light. In addition, the image source is disposed on the side of the transflective mirror 31 away from the light outlet 11. When the required optical path is constant, the space between the image source and the light outlet 11 can be better utilized, thereby improving space utilization and reducing the size of the head-up display device.

[0046] Specifically, in this embodiment, the transflective mirror 31 can transmit a portion of the light that strikes its surface and reflect a portion of the light that strikes its surface. For example, the transflective mirror 31 can reflect 50% of the light and transmit 50% of the light, or reflect 60% of the light and transmit 40% of the light, or reflect 70% of the light and transmit 30% of the light, and so on. Common materials for the transflective mirror 31 include glass, transparent plastic, and the like. Specifically, when the first image light first strikes the transflective mirror 31, a portion of the first image light passes through the transflective mirror 31 and strikes the reflector 32. After being reflected by the reflector 32, it strikes the transflective mirror 31 again. A portion of the first image light is reflected to the second reflector 33, and again reflected by the second reflector 33 to the third reflector 34. Finally, it is reflected by the third reflector 34 to the light outlet 11 for exit. This allows the light exiting through the light outlet 11 to be imaged by an external imaging device.

[0047] In this embodiment, the second reflector 33 is a curved reflector, and the third reflector 34 is a flat reflector. Setting the second reflector 33 as a curved reflector can magnify the image and provide a longer imaging distance.

[0048] Furthermore, in this embodiment, the first reflector 32 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 reflector 32 is fixed to the slider, thereby achieving the movability of the first reflector 32 within the housing 10. It will be understood that the use of a guide rail and a slider to movably dispose the first reflector 32 within the housing 10 is merely an example of a specific implementation method and does not constitute a limitation. In actual production, the movability of the first reflector 32 within the housing 10 may also be achieved through other methods, such as motor drive or electromagnetic drive. The first reflector 32 is movably disposed within the housing 10. By moving the first reflector 32, the optical path of the image light and the position of the image can be changed, thereby meeting more application needs and expanding the applicability of the head-up display device. It can be understood that the aforementioned first reflector 32 being movably arranged in the shell 10 is only a specific example in this embodiment and does not constitute a limitation. In actual production and use, the transflective mirror 31 can also be movably arranged in the shell 10, or the reflector 32 and the transflective mirror 31 can both be movably arranged in the shell 10, or the second reflector 33 and the third reflector 34 can be movably arranged in the shell 10. The specific arrangement can be flexibly made according to actual needs.

[0049] Specifically, in the present embodiment, the first reflector 32 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 reflector 32. The incident principal axis is the center line of the incident light beam, and the reflection principal axis is the center line of the reflected light beam. It can be understood that the aforementioned 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 reflector 32. It is only a specific example in the present 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 reflector 32, and can be flexibly set according to actual needs.

[0050] It will be understood that in this embodiment, the transflective mirror 31 is movably disposed within the housing 10 along a second preset direction. The second preset direction is the direction of the angle bisector of the angle formed by the incident principal axis and the reflection principal axis of the transflective mirror 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 will be understood that the aforementioned second preset direction being the direction of the angle bisector of the angle formed by the incident principal axis and the reflection principal axis of the transflective mirror 31 is merely a specific example in this embodiment and does not constitute a limitation. In other embodiments of the present invention, the second preset direction may also be any direction within the angle formed by the incident principal axis and the reflection principal axis of the transflective mirror 31, and may be flexibly set according to actual needs.

[0051] Furthermore, in this embodiment, the first 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 first image source 20 is secured to the slider, thereby enabling the first image source 20 to be movably disposed within the housing 10. It should be understood that the use of a guide rail and a slider to movably dispose the first image source 20 within the housing 10 is merely an example of a specific implementation and is not intended to be limiting. In actual production, the first image source 20 may be movably disposed within the housing 10 through other means, such as motor drive or electromagnetic drive. The movability of the first image source 20 within the housing 10 allows the optical path of the image light and the position of the image to be changed by moving the first image source 20, thereby meeting a wider range of usage needs and expanding the applicability of the head-up display device.

[0052] Specifically, in this embodiment, the first image source 20 is movably disposed within the housing 10 along the direction in which the principal axis of the image light extends. It will be appreciated that the aforementioned movably disposed within the housing 10 along the direction in which the principal axis of the image light extends is merely an example of this embodiment and does not constitute a limitation. In other embodiments of the present invention, the first image source 20 may be movably disposed within the housing 10 along other directions, and a flexible configuration may be implemented based on actual needs.

[0053] Specifically, in this embodiment, Figure 2 、 Figure 3As shown, the first 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 by the backlight assembly 22 into image light. The backlight assembly 22 may include a reflective light guide element 221, a direction control element 222, and a diffusion 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 diffusion element 223. The diffusion element 223 is used to diverge the light converged by the direction control element 222 at a preset angle and transmit the diffused 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 diffusion element 223 is arranged on the light exit side of the reflective light guide element 221.

[0054] 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.

[0055] like Figure 3As 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.

[0056] 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 4 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.

[0057] 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.

[0058] The diffusion 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 diffusion element 223 diffuses the concentrated light at a certain angle, increases the diffusion degree of the light, and can evenly distribute the light in a certain area. The diffusion element 223 can be a diffraction optical element, such as a beam shaping element (bemshper). After the light passes through the diffusion 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 diffusion element 223, the diffusion angle and cross-sectional shape of the light can be precisely controlled, thereby achieving precise control of the diffusion effect.

[0059] 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 5 As 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 and convert it into collimated light when it enters 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.

[0060] 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.

[0061] 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 6 Here, 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 6 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.

[0062] A second embodiment of the present invention relates to a head-up display device. Figure 7 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 structure 30. The main difference is that this embodiment further comprises a light shielding portion 40 and a sealing member 50. The sealing member 50 is disposed at the light outlet 11, and the light shielding portion 40 is disposed on the housing 10 to block external light directed toward the sealing member 50 along a third predetermined direction A.

[0063] 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.

[0064] 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 portion 40 is provided on the 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.

[0065] Preferably, in this embodiment, the light shielding portion 40 is movably provided on the housing 10. The light shielding portion 40 is movably provided on the housing 10, so that it can be adjusted accordingly according to the incident direction of the external light, so as to better block the external light, and further prevent the 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 light shielding portion 40 is fixed on the slider, etc. It can be understood that the above is only an example of a specific implementation method of realizing the movability of the light shielding portion 40 on the housing 10 in this embodiment, and does not constitute a limitation.

[0066] A third embodiment of the present invention relates to a head-up display device. Figure 8 As shown, the third embodiment is substantially the same as the second embodiment, both including a housing 10 , an image source 20 , a reflective structure 30 , and a sealing member 50 ; the main difference is that in this embodiment, a portion of the second reflector 32 extends to the outside of the housing 10 to form a light shielding portion 40 .

[0067] 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 reflector 32 to partially extend outside the housing 10 to form a shading portion 40, thereby eliminating the strong light area and further reducing the size of the head-up display device.

[0068] A fourth embodiment of the present invention relates to a head-up display device. Figure 9 As shown, the fourth embodiment is substantially the same as the first embodiment, and both include a housing 10, a first image source 20, and a reflective structure 30. The main difference is that in this embodiment, a second image source 60 is further included. The second image source 60 is disposed on a side of the reflective mirror 31 away from the light outlet 11 for emitting a second image light.

[0069] Specifically, the second image light is emitted to the transflective mirror 31, the light projected by the transflective mirror 31 is emitted to the second reflective mirror 33, the light reflected by the second reflective mirror 33 is emitted to the third reflective mirror 34, and the light reflected by the third reflective mirror 34 is emitted through the light outlet 11, so that the light emitted through the light outlet 11 is imaged by an external imaging device.

[0070] Specifically, in this embodiment, the second image light is transmitted through the reflective mirror 31 and then overlaps with the first image light.

[0071] Compared with the prior art, the head-up display device provided in the fourth embodiment of the present invention is provided with a first light source and a second image source. The second image light is transmitted through the reflective mirror 31 and overlaps with the first image light, which can effectively enhance the intensity of the image light and improve the clarity of the image.

[0072] A fifth embodiment of the present invention relates to a head-up display device. Figure 10As shown, the fifth embodiment is substantially the same as the first embodiment, and both include a housing 10, a first image source 20, and a reflective structure 30. The main difference is that in this embodiment, a light characteristic conversion element 70 is further included. The light characteristic conversion element is disposed between the first reflector 32 and the transflective mirror 31. The transflective mirror 31 is a polarizing transflective mirror 31, which is used to transmit light with a first characteristic and reflect light with other characteristics. The light characteristic conversion element is used to convert the characteristics of the transmitted light. The first image light is emitted to the transflective mirror 31, and the light with the first characteristic in the first image light is transmitted to the light characteristic conversion element. The light with the first characteristic is transmitted through the light characteristic conversion element. The light is converted into a light with a second characteristic after being reflected by the light element and is emitted to the first reflector 32. The light with the second characteristic reflected by the first reflector 32 is emitted to the light characteristic conversion element. The light with the second characteristic is transmitted through the light characteristic conversion element and converted into a light with a third characteristic and is emitted to the transflective mirror 31. The light reflected by the transflective mirror 31 is emitted to the second reflector 33. The light reflected by the second reflector 33 is incident on the third reflector 34. The light reflected by the third reflector 34 is emitted through the light outlet 11, so that the light emitted through the light outlet 11 is imaged by an external imaging device; wherein the first characteristic, the second characteristic and the third characteristic are all different.

[0073] Compared with the prior art, the fifth embodiment of the present invention retains all the technical effects of the first embodiment while setting the reflective mirror 31 as a polarizing reflective mirror 31 and providing a light characteristic conversion element to convert the light of the first characteristic projected through the reflective mirror 31 into the light of the second characteristic, which is reflected on the polarizing reflective mirror 31, thereby reducing light loss and improving image clarity.

[0074] Specifically, in the present embodiment, the light characteristic conversion element is a wave plate, such as a 1 / 4 wave plate or a 1 / 2 wave plate. Here, an example of the light characteristic conversion element being a 1 / 4 wave plate is given, and the first image light with the first characteristic is exemplified as vertically polarized light. The vertically polarized light is transformed into light of the second characteristic, i.e., circularly polarized light, after passing through the 1 / 4 wave plate for the first time. The circularly polarized light is reflected by the first reflector 32 and passes through the 1 / 4 wave plate again to be transformed into light of the third characteristic, i.e., horizontally polarized light. After the horizontally polarized light is irradiated on the reflector 31, since the polarization reflector 31 can only transmit light of the first characteristic, i.e., vertically polarized light, all the horizontally polarized light is reflected to the light outlet 11 for emission. This reduces the loss of the first image light and improves the clarity of the imaging. It can be understood that the above is only a specific example in the present embodiment and does not constitute a limitation. In other embodiments of the present invention, it may also be as follows Figure 11As shown, the first image light is emitted to the transflective mirror 31, and the light with the first characteristic in the first image light is transmitted to the light characteristic conversion element. The light with the first characteristic is converted into a light with the second characteristic after passing through the light characteristic conversion element and is emitted to the first reflector 32. The light with the second characteristic reflected by the first reflector 32 is emitted to the light characteristic conversion element. The light with the second characteristic is transmitted through the light characteristic conversion element and is converted into a light with the third characteristic and is emitted to the transflective mirror 31. The light with the third characteristic reflected by the transflective mirror 31 is emitted to the light characteristic conversion element. The light with the third characteristic is transmitted through the light characteristic conversion element and is converted into a light with the fourth characteristic and is incident on the second reflector 33. The light reflected by the second reflector 33 is incident on the third reflector 34. The light reflected by the third reflector 34 is emitted through the light outlet 11, so that the light emitted through the light outlet 11 is imaged by an external imaging device; wherein the first characteristic, the second characteristic, the third characteristic and the fourth characteristic are all different.

[0075] A sixth embodiment of the present invention provides a motor vehicle, such as Figure 12 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 image 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 structure 30.

[0076] After the image light from 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 diffuser 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 structure 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 diffuser element 223 is provided, the diffused light beam precisely covers the eyebox area, achieving the highest system light efficiency.

[0077] 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 P-polarized light. 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 image 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 propagation path of the image light, such as: a. between the first reflector 31 and the light outlet 11; b. on a side surface of the sealing member 50 close to the first reflector 31, etc. It is understandable that if the image source 20 is adjusted to emit P-polarized image 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 12 As 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 image light passes through the P-polarized reflective film 400, due to the high transmittance of the glass 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.

[0078] Furthermore, it is understood that the head-up display device included in the motor vehicle provided in the fourth embodiment of the present invention may also be replaced by a head-up display device provided in any one of the second and third embodiments.

[0079] 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 reflected by the curved reflector 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 12 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.

[0080] 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.

[0081] 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 image light emitted by the image source 20. If the image light includes light in three wavelength bands, RGB, the selective reflective film only reflects the RGB light and transmits the other light. In this way, the image 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.

[0082] 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 image 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 image 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.

[0083] It is not difficult to see that this embodiment is a system 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 are not 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.

[0084] 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.

[0085] 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: case; a first image source and a reflective structure disposed within the housing; Wherein, a light outlet is provided on the shell, and the reflective structure includes a transflective mirror, a first reflector, a second reflector and a third reflector, wherein the first reflector is a plane reflector, the first image source is provided on a side of the transflective mirror away from the light outlet, the first reflector and the third reflector are provided on a side of the transflective mirror close to the light outlet, the first image source is used to emit a first image light, the transflective mirror allows light to be reflected and allowed to be transmitted, the first image light emitted by the first image source is emitted to the transflective mirror, the light transmitted through the transflective mirror is emitted to the first reflector for reflection, the light reflected by the first reflector is emitted to the transflective mirror, the light reflected by the transflective mirror is emitted to the second reflector, the light reflected by the second reflector is emitted to the third reflector, and the image light reflected by the third reflector is emitted through the light outlet, so that the image light emitted through the light outlet is imaged by an external imaging device; The first image source includes a light source and a backlight assembly; The backlight assembly is used to transmit the light emitted by the light source; the backlight assembly includes a reflective light guide element and a direction control element; the reflective light guide 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 element; The reflective light-guiding element comprises a solid light-transmitting component having a refractive index greater than 1; the solid light-transmitting component comprises a light-emitting surface, a light-reflecting surface, and a light-source receiving groove; the light-emitting surface is adjacent to the direction-controlling element, the light-reflecting surface extends from the periphery of the light-emitting surface in a direction away from the direction-controlling element, and the light-source receiving groove is located on a side of the light-reflecting surface away from the light-emitting surface and is recessed from the edge of the light-reflecting surface on that side toward a side closer to the light-emitting surface; a second image source, the second image source being configured to emit a second image light, the second image source being located on a side of the reflective mirror away from the light outlet; The second image light is emitted to the transflective mirror, the light transmitted through the transflective mirror is emitted to the second reflective mirror, the light reflected through the second reflective mirror is emitted to the third reflective mirror, and the light reflected through the third reflective mirror is emitted through the light outlet, so that the light emitted through the light outlet is imaged by an external imaging device; The second image light is transmitted through the reflective mirror and then overlaps with the first image light.

2. The head-up display device according to claim 1, wherein: Also includes: a light characteristic conversion element, the light characteristic conversion element being disposed between the first reflector and the transflective mirror, the transflective mirror being configured to transmit light of a first characteristic and reflect light of other characteristics, the light characteristic conversion element being configured to convert the characteristics of the transmitted light; The first image light is emitted to the transflective mirror, light with a first characteristic in the first image light is transmitted to the light characteristic conversion element, the light with the first characteristic is converted into light with a second characteristic after passing through the light characteristic conversion element and is emitted to the first reflector, the light with the second characteristic reflected by the first reflector is emitted to the light characteristic conversion element, the light with the second characteristic is converted into light with a third characteristic after passing through the light characteristic conversion element and is emitted to the transflective mirror, and the light reflected by the transflective mirror is emitted to the second reflector; The first characteristic, the second characteristic and the third characteristic are all different.

3. The head-up display device according to claim 1, wherein: Also includes: a light characteristic conversion element, the light characteristic conversion element being disposed between the first reflector and the transflective mirror, the transflective mirror being configured to transmit light of a first characteristic and reflect light of other characteristics, the light characteristic conversion element being configured to convert the characteristics of the transmitted light; The first image light is emitted to the transflective mirror, and light with a first characteristic in the first image light is transmitted to the light characteristic conversion element. The light with the first characteristic is transmitted through the light characteristic conversion element and converted into light with a second characteristic and emitted to the first reflector. The light with the second characteristic reflected by the first reflector is emitted to the light characteristic conversion element. The light with the second characteristic is transmitted through the light characteristic conversion element and converted into light with a third characteristic and emitted to the transflective mirror. The light with the third characteristic is reflected by the transflective mirror and emitted to the light characteristic conversion element. The light with the third characteristic is transmitted through the light characteristic conversion element and converted into light with a fourth characteristic and emitted to the second reflector. The first characteristic, the second characteristic, the third characteristic and the fourth characteristic are all different.

4. The head-up display device according to claim 2 or 3, characterized in that: The light characteristic conversion element is a wave plate.

5. The head-up display device according to claim 1, wherein: The second reflector is a curved reflector, and the third reflector is a flat reflector.

6. The head-up display device according to claim 1, wherein: The first reflecting mirror and / or the second reflecting mirror and / or the third reflecting mirror and / or the transflective mirror are movably arranged in the housing.

7. The head-up display device according to claim 6, characterized in that: The first reflector 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 reflector.

8. The head-up display device according to claim 7, 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 reflector.

9. The head-up display device according to claim 6, wherein: The transflective mirror is movably arranged in the housing along a second preset direction, and the second preset direction is any direction within the angle formed by the incident principal axis and the reflection principal axis of the transflective mirror.

10. The head-up display device according to claim 9, 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 transflective mirror.

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

12. The head-up display device according to claim 1, wherein: Also includes: shading part; Wherein, a sealing member is provided at the light outlet of the shell, and the light shielding portion is used to shield external light emitted toward the sealing member along a third preset direction.

13. The head-up display device according to claim 12, characterized in that: The second reflector at least partially extends outside the housing to form the light shielding portion.

14. The head-up display device according to claim 1, wherein: The first image source further includes an image generating element; The image generating element is used to convert the light transmitted through the backlight assembly into the image light.

15. The head-up display device according to claim 14, characterized in that: The backlight assembly further includes a diffusion element; The diffusion element is used to diffuse the light converged by the direction control element at a preset angle.

16. A motor vehicle, characterized in that: include: An imaging device and a head-up display device according to any one of claims 1 to 15, wherein the imaging device is used to image the image light emitted through the light outlet.

17. The motor vehicle according to claim 16, characterized in that Also included are sunglasses, characterized in that: the sunglasses are used to transmit P-polarized light and block S-polarized light.

18. The motor vehicle according to claim 17, characterized in that It also includes a phase delay element arranged between the light outlet and the imaging device. The image 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.

19. The motor vehicle according to claim 17, wherein: The imaging device is provided with a P-polarized reflective film, and the image light emitted through the light outlet is P-polarized light.

20. The motor vehicle according to claim 16, wherein: The imaging device is a windshield, and a wedge-shaped film is arranged inside the windshield.

21. The motor vehicle according to claim 16, wherein: It also includes a selective reflection film arranged on the imaging device, and the selective reflection film is used to reflect the image light.

Images