3D display system and method, vehicle-mounted sun shield assembly and vehicle

Abstract

The invention discloses a 3D display system and method, a vehicle-mounted sun shield assembly and a vehicle, and the system comprises a first projection unit which comprises a first light machine and a first optical waveguide unit, the first light machine is configured to output first image light of a scene, and the first optical waveguide unit is configured to output second image light of the scene; the first optical waveguide unit is configured to converge the first image light at a first viewpoint position on the imaging side of the 3D display system; and the second projection unit comprises a second light machine and a second optical waveguide unit, the second light machine is configured to output second image light of the scene, and the second optical waveguide unit is configured to converge the second image light at a second viewpoint position on the imaging side of the 3D display system. The first projection unit and the second projection unit emit the first image light and the second image light of different visual angles of the same scene respectively, the first image light and the second image light are coupled out through the optical waveguide and then reach the left eye and the right eye of a person respectively, long-distance large-size high-definition color naked-eye 3D imaging can be achieved, the visual space in a cabin is expanded, and the watching effect and the experience feeling are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D display, more particularly, to a display system, a vehicle-mounted sun visor assembly and a vehicle. BACKGROUND

[0002] Nowadays, as more and more cars, as the third space in addition to living and working, the in-cabin experience is put in an increasingly important position. As an indispensable intelligent cabin function, the movie display is paid more and more attention and investment by more and more car companies. However, due to the limitation of the physical space in the car, the movie display technology related thereto has the problem of poor movie effect, which affects the user experience. SUMMARY

[0003] The embodiments of the present application provide a 3D display system, method, vehicle-mounted sun visor assembly and vehicle, which improve the movie effect and user experience in the limited physical space in the car.

[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a 3D display system is provided, comprising:

[0005] A first projection unit, the first projection unit comprises a first light machine and a first light waveguide unit, the first light machine is configured to output first image light rays of a scene, and the first light waveguide unit is configured to converge the first image light rays at a first viewpoint position on the imaging side of the 3D display system.

[0006] A second projection unit, the second projection unit comprises a second light machine and a second light waveguide unit, the second light machine is configured to output second image light rays of the scene, and the second light waveguide unit is configured to converge the second image light rays at a second viewpoint position on the imaging side of the 3D display system.

[0007] Optionally, the first light waveguide unit comprises a first coupling-in element, a first waveguide substrate and a first coupling-out element,

[0008] The first coupling-in element is configured to couple the first image light rays into the first waveguide substrate;

[0009] The first waveguide substrate is configured to transmit the first image light rays;

[0010] The first coupling-out element is configured to couple the first image light rays to the first viewpoint position.

[0011] Optionally, the coupling-out diffraction efficiency of the first coupling-out element gradually increases along the direction in which the first viewpoint position points to the second viewpoint position.

[0012] Optionally, the first coupling-in element and the first coupling-out element are surface relief gratings or volume holographic gratings.

[0013] Optionally, the first outcoupling element is a one-dimensional grating or a two-dimensional grating.

[0014] Optionally, the first optical waveguide unit further includes a first turning element, and the first outcoupling element is a one-dimensional grating.

[0015] The first turning element is configured to deflect the optical path of the first image light transmitted from the first waveguide substrate and then transmit it to the first outcoupling element, so as to achieve pupil expansion of the first image light.

[0016] Optionally, the first optical engine includes a first micro display and a first collimator,

[0017] The first microdisplay is configured to output the first image light;

[0018] The first collimator is configured to convert the first image light into a multi-field collimated parallel light beam.

[0019] According to a second aspect of the present application, there is provided a vehicle sun visor assembly, comprising:

[0020] sun visor housing;

[0021] The first projection unit and the second projection unit of the above-mentioned 3D display system are symmetrically arranged on the side of the sun visor housing facing the user.

[0022] Optionally, the component further comprises an eye tracking device, wherein the eye tracking device is arranged on a side of the sun visor shell facing the user, and the eye tracking device is configured to obtain the user's eye position.

[0023] Optionally, the assembly further comprises a first multi-degree-of-freedom mechanical control unit and a second multi-degree-of-freedom mechanical control unit,

[0024] The sun visor housing is connected to the first projection unit via the first multi-degree-of-freedom mechanical control unit;

[0025] The sun visor housing is connected to the second projection unit via the second multi-degree-of-freedom mechanical control unit;

[0026] The multi-degree-of-freedom mechanical control unit is configured to adjust the posture of the first projection unit, and the second multi-degree-of-freedom mechanical control unit is configured to adjust the posture of the second projection unit.

[0027] Optionally, the first multi-degree-of-freedom mechanical control unit includes a first telescopic element, a second telescopic element, a third telescopic element, a fourth telescopic element and a fifth telescopic element.

[0028] The first telescopic element, the second telescopic element, the fourth telescopic element and the fifth telescopic element are respectively arranged around the first projection unit on the side facing away from the user, and the third telescopic element is arranged at the center of the first projection unit on the side facing away from the user.

[0029] According to a third aspect of the present application, a 3D display control method is provided for the above-mentioned vehicle sun visor assembly, comprising:

[0030] Get the user's eye position;

[0031] The positions of the first viewpoint and the second viewpoint are adjusted according to the eye position of the user.

[0032] According to a fourth aspect of the present application, an electronic device is provided, including:

[0033] Memory, on which computer programs / instructions are stored;

[0034] A processor is configured to execute the computer program / instructions in the memory to implement the steps of the above-mentioned 3D display control method.

[0035] According to a fifth aspect of the present application, a computer-readable storage medium is provided, on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, the steps of the above-mentioned 3D display control method are implemented.

[0036] According to a sixth aspect of the present application, a computer program product is provided, comprising a computer program / instruction, wherein the computer program / instruction implements the steps of the above-mentioned 3D display control method when executed by a processor.

[0037] According to the seventh aspect of the present application, a vehicle is provided, which includes the electronic device as described above, or the computer-readable storage medium as described above, or the vehicle sun visor assembly as described above, or the 3D display system as described above.

[0038] This application uses first and second projection units to emit first and second image light rays from different perspectives of the same scene. After coupling through optical waveguides, these light rays reach the left and right eyes, respectively, allowing each eye to receive different images. Based on binocular parallax and brain fusion, 3D stereoscopic vision is ultimately achieved. Compared to larger optical waveguide displays, this application does not require such a large eye box to simultaneously cover both eyes and the dynamic range of movement. It can achieve large-scale, high-definition, color, naked-eye 3D imaging at long distances, expanding the visual space within the cabin, providing more intuitive information display, a stronger sense of immersion, and more vivid images, greatly improving the viewing effect and experience.

[0039] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 A schematic diagram of a 3D display system architecture provided by certain embodiments of the present application;

[0042] Figure 2 A schematic diagram of an optical architecture of a 3D display system provided in certain embodiments of the present application;

[0043] Figure 3 A schematic diagram of a one-dimensional grating and one-dimensional pupil expansion structure provided in certain embodiments of the present application;

[0044] Figure 4 A schematic diagram of a one-dimensional grating two-dimensional pupil expansion structure provided in certain embodiments of the present application;

[0045] Figure 5 A schematic diagram of a two-dimensional grating two-dimensional pupil expansion structure provided in certain embodiments of the present application;

[0046] Figure 6 A schematic diagram of the layout of a vehicle sun visor assembly provided in certain embodiments of the present application;

[0047] Figure 7 A schematic diagram of a layout of a multi-degree-of-freedom mechanical control unit provided in certain embodiments of the present application;

[0048] Figure 8 Another schematic side view layout diagram of a vehicle sun visor assembly provided by certain embodiments of the present application;

[0049] Figure 9 A schematic diagram of the principle of long-distance, large-scale imaging using an optical waveguide is provided in certain embodiments of the present application.

[0050] Description of reference numerals:

[0051] 1. First projection unit; 11. First optical engine; 111. First microdisplay; 112. First collimator; 12. First optical waveguide unit; 121. First coupling element; 122. First waveguide substrate; 123. First coupling element; 124. First turning element; 125. Left edge viewing angle ray of the leftmost area of ​​the first coupling element 123; 126. Center viewing angle ray of the leftmost area of ​​the first coupling element 123; 127. Right edge viewing angle ray of the leftmost area of ​​the first coupling element 123; 128. Right edge viewing angle ray of the rightmost area of ​​the first coupling element 123; 129. Center viewing angle ray of the rightmost area of ​​the first coupling element 123; 130. Rightmost area of ​​the first coupling element 123 1. Left edge viewing angle ray; 2. Second projection unit; 21. Second optical machine; 211. Second microdisplay; 212. Second collimator; 22. Second optical waveguide unit; 221. Second coupling element; 3. First viewpoint position; 4. Second viewpoint position; 5. Sun visor housing; 6. Eye tracking device; 7. First multi-degree-of-freedom mechanical control unit; 71. First telescopic element; 72. Second telescopic element; 73. Third telescopic element; 74. Fourth telescopic element; 75. Fifth telescopic element; 8. Second multi-degree-of-freedom mechanical control unit; 81. Sixth telescopic element; 82. Seventh telescopic element; 83. Eighth telescopic element; 84. Ninth telescopic element; 85. Tenth telescopic element; 9. Long-distance large-size virtual image;

[0052] A1, the first viewpoint position 3 points to the direction of the second viewpoint position 4; A2, the second viewpoint position 4 points to the direction of the first viewpoint position 3. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0054] With the increasing number of cars in use, the in-cabin experience is becoming increasingly important as a third space, alongside living and working. Existing in-cabin displays mostly rely on conventional LCD screens, which offer only 2D effects. Due to the physical limitations of the vehicle, the screen size and viewing distance are very limited. Prolonged viewing can easily lead to visual fatigue and motion sickness when the vehicle is in motion. As an essential smart cockpit feature, in-car viewing displays are attracting increasing attention and investment from automakers, making it imperative to improve in-car viewing quality.

[0055] In order to solve the above problems, the present invention provides a 3D display system. Figure 1 Shown, including:

[0056] A first projection unit 1, comprising a first optical engine 11 and a first optical waveguide unit 12, wherein the first optical engine 11 is configured to output a first image light of a scene, and the first optical waveguide unit 12 is configured to converge the first image light at a first viewpoint position 3 on an imaging side of the 3D display system;

[0057] The second projection unit 2 includes a second optical engine 21 and a second optical waveguide unit 22. The second optical engine 21 is configured to output a second image light of the scene, and the second optical waveguide unit 22 is configured to converge the second image light at a second viewpoint position 4 on the imaging side of the 3D display system.

[0058] Among them, it can be understood that the optical machine may include but is not limited to being the core of image generation, responsible for converting digital signals into high-resolution, high-brightness optical signals and controlling the optical path; the optical waveguide unit may include but is not limited to being used to efficiently transmit, guide and expand optical signals, ensuring that light is transmitted from the image source (optical machine) to the human eye or target display area along a specific path; the viewpoint position may include but is not limited to being the key position point in the projection optical path for generating 3D images, that is, the position of the observer's left eye or right eye in three-dimensional space.

[0059] Specifically, the first projection unit 1 includes a first optical engine 11 and a first optical waveguide unit 12. The first optical engine 11 outputs a first image light of a scene to the first optical waveguide unit 12, which converges the first image light at a first viewpoint 3 on the imaging side of the 3D display system (e.g., the left eye). The second projection unit 2 includes a second optical engine 21 and a second optical waveguide unit 22. The second optical engine 21 outputs a second image light of the same scene from a different perspective to the second optical waveguide unit 22, which converges the second image light at a second viewpoint 4 on the imaging side of the 3D display system (e.g., the right eye). In one specific embodiment, after rationally designing the field of view angle and eye box size, the first projection unit 1 and the second projection unit 2 respectively emit first and second image light of the same 3D scene adapted for different perspectives of the left and right eyes. The light is then coupled out through the first and second optical waveguide units and reaches the left and right eyes, respectively, so that the left and right eyes receive different images, ultimately achieving 3D stereoscopic vision based on binocular parallax and brain fusion. Compared with larger-area optical waveguide displays, this application does not require such a large eye box to cover both eyes and the dynamic movement range at the same time, and can achieve long-distance, large-size, high-definition, color, naked-eye 3D imaging, expanding the visual space in the cockpit, making information display more intuitive, more immersive, and more vivid, greatly improving the viewing effect and experience.

[0060] Figure 9 A schematic diagram shows the principle of creating a large-scale, long-distance virtual image 9 with an optical waveguide. In the figure, α represents the horizontal field of view, β represents the vertical field of view, and 9 represents the resulting large-scale, long-distance virtual image. Parallel light beams at various field angles projected by the microprojector pass through the incoupling element, the deflection element (if any), and the outcoupling element, ultimately reaching the human eye. Based on long-established visual experience, the human eye reversely traces the light rays to observe the large-scale, long-distance virtual image 9. Combined with binocular parallax and brain fusion, 3D stereoscopic vision is achieved.

[0061] In certain embodiments, combined Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the first optical waveguide unit 12 includes a first coupling element 121, a first waveguide substrate 122 and a first coupling element 123.

[0062] The first coupling element 121 is configured to couple the first image light into the first waveguide substrate 122;

[0063] The first waveguide substrate 122 is configured to transmit a first image light;

[0064] The first outcoupling element 123 is configured to couple the first image light to the first viewpoint position 3 .

[0065] It can be understood that the coupling-in element may include, but is not limited to, a diffraction structure located on the surface of the waveguide substrate, which couples the image light of a collimated external light source (such as a laser or microdisplay) into the waveguide substrate, causing it to propagate through total internal reflection. The coupling-in element may be a surface relief grating, a volume holographic grating, or may include, but is not limited to, inclined side surfaces, reflective elements, refractive prisms, photonic crystals, etc. The waveguide substrate may include, but is not limited to, a material made of a high refractive index material (such as glass or polymer), which guides light propagation internally through total internal reflection. The coupling-out element may include, but is not limited to, a diffraction structure located on the surface of the waveguide substrate, such as a surface relief grating or a volume holographic grating, which couples the totally reflected light within the waveguide substrate out of the waveguide substrate, forming visible multi-field parallel light.

[0066] Specifically, the first optical waveguide unit 12 is composed of a first coupling element 121, a first waveguide substrate 122, and a first coupling element 123. The first image light of the scene output by the first optical engine 11 is coupled into the first waveguide substrate 122 through the first coupling element 121. The first image light then undergoes total internal reflection within the first waveguide substrate 122 for a certain distance before reaching the first coupling element 123. The first coupling element 123 then couples the first image light to the first viewpoint 3 (e.g., the left eye).

[0067] In certain embodiments, combined Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the outcoupling diffraction efficiency of the first outcoupling element 123 gradually increases in the direction from the first viewpoint position 3 to the second viewpoint position 4.

[0068] It can be understood that the outcoupling diffraction efficiency may include but is not limited to the efficiency of the outcoupling element in coupling the light propagating in the waveguide substrate out of the waveguide substrate, that is, the ratio of the power of the output light to the power of the input light.

[0069] Specifically, the diffraction efficiency of the first outcoupling element 123 gradually increases along the direction A1 pointing from the first viewpoint position 3 to the second viewpoint position 4. In one specific embodiment, taking a surface relief grating as an example, a particle swarm optimization algorithm combined with a rigorous coupled wave analysis method or other global optimization algorithm can be used to optimize the diffraction efficiency of the coupling grating to a target value. Optimizable parameters include the material of the waveguide substrate, the material of the coupling grating, and the shape of the coupling grating, such as a rectangular grating, a blazed grating, a tilted grating, or a trapezoidal grating, to obtain the target diffraction efficiency. The optimized first outcoupling element 123 can maximize the diffraction efficiency of the grating in the rightmost region of the first outcoupling element 123 for viewing angle light 129 and viewing angle light 130, while minimizing or even eliminating the diffraction efficiency for viewing angle light 128 that may enter the right eye. This ensures that the first projection unit 1 and the second projection unit 2 do not cause image crosstalk.

[0070] In certain embodiments, combined Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the first coupling-in element 121 and the first coupling-out element 123 are surface relief gratings or volume holographic gratings. By using surface relief gratings or volume holographic gratings, high diffraction efficiency, a large field of view, and high stability can be achieved.

[0071] Optionally, the first coupling element 121 has an inclined side surface. This inclined side surface of the waveguide substrate 122 can serve as the functional surface of the light coupling mechanism. This inclined side surface faces the projection light engine, allowing image light projected by the projection light engine to be refracted at the inclined side surface and coupled into the waveguide substrate. To reduce reflection losses, an antireflection coating can also be applied to the inclined side surface.

[0072] Optionally, the first coupling element 121 is a reflective element, which can be disposed correspondingly on the inclined side surface of the waveguide substrate 122. The first surface of the waveguide substrate 122 faces the projection light engine, so that the image light is reflected at the inclined side surface and coupled into the waveguide substrate 122. The reflective element can include a reflective film or be composed of a prism coated with a reflective film.

[0073] Optionally, the first coupling element 121 is a refractive prism having a coupling side surface and an inclined surface extending obliquely relative to the coupling side surface. The inclined surface of the refractive prism is attached to the second surface of the waveguide substrate, and the coupling side surface serves as a functional surface of the light coupling mechanism, so that light can be coupled into the waveguide substrate 122.

[0074] Optionally, the first coupling element 121 is a photonic crystal, and the optical signal transmission structure is finely designed and controlled through micro-nano optics, and optical coupling is achieved by using spatial optical path coupling methods such as lens transformation.

[0075] In certain embodiments, combined Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the first outcoupling element 123 is a one-dimensional grating or a two-dimensional grating.

[0076] It can be understood that a one-dimensional grating may include but is not limited to a grating having a periodic structure in only one direction (such as horizontal or vertical periodic etching); a two-dimensional grating may include but is not limited to a grating having a periodic structure in both directions (such as horizontal and vertical periodic etching).

[0077] Specifically, in some specific embodiments, the first coupling-out element 123 may be as follows: Figure 3 or Figure 4 The one-dimensional grating shown, or Figure 5 In one embodiment, the two-dimensional grating Figure 5 This demonstration demonstrates a diffractive waveguide using a two-dimensional grating as an output coupling element to achieve two-dimensional pupil expansion. The two-dimensional grating performs both pupil expansion and exit pupil functions. Its unit structure micro-units can be cylinders, prismatic columns, or other polygonal columns, making the entire optical system more compact. Using one-dimensional or two-dimensional pupil expansion techniques can significantly reduce the size of the first optical engine 11.

[0078] In certain embodiments, combined Figure 2 and Figure 4 As shown, the first optical waveguide unit 12 further includes a first turning element 124, and the first outcoupling element 123 is a one-dimensional grating.

[0079] The first turning element 124 is configured to deflect the first image light transmitted from the first waveguide substrate 122 and transmit the deflected light to the first outcoupling element 123 to achieve pupil expansion of the first image light.

[0080] It can be understood that the turning element may include but is not limited to a periodic structure for changing the propagation direction of light in a waveguide, and usually realizes pupil expansion and steering of the light path through reflection and diffraction.

[0081] Specifically, the first optical engine 11 outputs the first image light of the scene, which is coupled into the first waveguide substrate 122 through the first coupling element 121. Then, the first image light reaches the first turning element 124 after undergoing total internal reflection for a certain distance inside the first waveguide substrate 122. The first turning element 124 redirects the optical path of the first image light into multiple paths, and then transmits it to the first coupling element 123 through the first waveguide substrate 122. The first coupling element 123 couples the first image light to the first viewpoint position 3 (such as the left eye). The introduction of the turning element can achieve a large FOV and large eyebox display even when the first coupling element 123 is a one-dimensional grating, thereby enhancing the sense of immersion.

[0082] In some embodiments, in combination with Figure 1 and Figure 2 As shown, the first light engine 11 includes a first micro display 111 and a first collimator 112,

[0083] The first micro display 111 is configured to output first image light rays;

[0084] The first collimator 112 is configured to convert the first image light rays into a multi-view collimated parallel light beam.

[0085] Wherein, it can be understood that the first micro display 111 can include but is not limited to Micro-LED (Micro Light Emitting Diode Display), LCD (Liquid Crystal Display), DLP (Digital Light Porsessor), LCOS (Liquid Crystal on Silicon), etc.; The first collimator 112 can include but is not limited to a conventional lens group, a Fresnel lens, a super lens, a super surface, etc.

[0086] Specifically, the first micro display 111 is responsible for converting digital signals into high-resolution, high-brightness first image light rays and emitting them to the first collimator 112. Then the first collimator 112 converts the first image light rays into a multi-view collimated parallel light beam, reducing the divergence angle of light.

[0087] In some embodiments, in combination with Figure 1 and Figure 2 As shown, the second projection unit 2 and the first projection unit 1 are symmetrical and identical in structure.

[0088] In some embodiments, in combination with Figure 1 and Figure 2 As shown, the diffraction efficiency of the second out-coupling element of the second light waveguide unit 22 gradually increases in the direction from the second viewpoint position 4 to the first viewpoint position 3.

[0089] The embodiments of the present application provide a vehicle sun visor assembly, in combination with Figure 6 As shown, it includes:

[0090] A sun visor housing 5;

[0091] The first projection unit 1 and the second projection unit 2 of the above-mentioned 3D display system are symmetrically arranged on the side of the sun visor housing 5 facing the user.

[0092] Specifically, a first and second symmetrical projection unit 1 and 2 are integrated on the user-facing side of the sun visor housing 5. After properly designing the field of view and eyebox size, the left and right projection units each project images of the same 3D scene, adapted for the different perspectives of the left and right eyes. After waveguide coupling, these images reach the left and right eyes, allowing each to receive a different image. Ultimately, 3D stereoscopic vision is achieved based on binocular parallax and brain fusion. In one specific embodiment, taking an SUV as an example, the passenger sun visor is divided into two symmetrical parts. By measuring the distance from the visor to the eye when it is normally open (i.e., the pupil relief), the angle of half the visor's opening relative to the eye can be calculated. The field of view angle is then determined based on the desired eyebox size. Specifically, the appropriate eyebox size and field of view angle can be determined based on the size of the sun visor and the size of the coupling element that can be placed on the sun visor. Integrating a glasses-free 3D display system into a vehicle sun visor not only expands the functional boundaries of traditional sun visors but also provides innovative directions for interactive design in smart cars by optimizing spatial efficiency, interaction efficiency, safety, and user experience.

[0093] Optionally, the 3D display system can be arranged in different locations in the car according to different needs and application scenarios, such as on the skylight, on the headrests of the front seats, etc. These different application scenarios will not be described separately to avoid unnecessary repetition.

[0094] In a specific embodiment, Figure 9 A schematic diagram shows the principle of creating a large-scale, long-distance virtual image 9 with an optical waveguide. In the figure, α represents the horizontal field of view, β represents the vertical field of view, and 9 represents the resulting large-scale, long-distance virtual image. Parallel light beams at various field angles projected by the microprojector pass through the incoupling element, the deflection element (if any), and the outcoupling element, ultimately reaching the human eye. Based on long-established visual experience, the human eye reversely traces the light rays to observe the large-scale, long-distance virtual image 9. Combined with binocular parallax and brain fusion, 3D stereoscopic vision is achieved.

[0095] In certain embodiments, combined Figure 6 As shown, the assembly further includes an eye tracking device 6, which is disposed on the side of the sun visor housing 5 facing the user, and is configured to obtain the user's eye position.

[0096] It can be understood that an eye tracking device may include but is not limited to a device that monitors and records the movement trajectory of the human eye through optical or electronic technology.

[0097] Specifically, the eye tracking device 6 is disposed on the side of the sun visor housing 5 facing the user, such as above the symmetrical centerline between the first projection unit 1 and the second projection unit 2. By configuring the eye tracking device 6 to detect the user's eye position, the first viewpoint position 3 and the second viewpoint position 4 can be adjusted, significantly improving the system's interactivity, display quality, and user experience.

[0098] In certain embodiments, combined Figure 7 and Figure 8 As shown, the assembly further includes a first multi-degree-of-freedom mechanical control unit 7 and a second multi-degree-of-freedom mechanical control unit 8.

[0099] The sun visor housing 5 is connected to the first projection unit 1 via a first multi-degree-of-freedom mechanical control unit 7;

[0100] The sun visor housing 5 is connected to the second projection unit 2 via a second multi-degree-of-freedom mechanical control unit 8;

[0101] The multi-degree-of-freedom mechanical control unit 7 is configured to adjust the posture of the first projection unit 1 , and the second multi-degree-of-freedom mechanical control unit 8 is configured to adjust the posture of the second projection unit 2 .

[0102] Specifically, the user-facing side of the sun visor housing 5 is connected to the first projection unit 1 via a first multi-DOF mechanical control unit 7, while the user-facing side of the sun visor housing 5 is connected to the second projection unit 2 via a second multi-DOF mechanical control unit 8. For example, the sun visor housing 5 and the first multi-DOF mechanical control unit 7 are fixedly connected, while the first projection unit 1 and the multi-DOF mechanical control unit 7 are movably connected. Under the respective control of the first multi-DOF mechanical control unit 7 and the second multi-DOF mechanical control unit 8, the first and second projection units 1 and 2 can adjust their postures, such as leaning forward, left, or backward, to accommodate different passengers' heights and sitting postures, further enhancing the in-cabin user experience.

[0103] Optionally, the first multi-degree-of-freedom mechanical control unit 7 and the second multi-degree-of-freedom mechanical control unit 8 are symmetrically arranged and have the same internal structure.

[0104] In certain embodiments, combined Figure 7 and Figure 8 As shown, the first multi-degree-of-freedom mechanical control unit 7 includes a first telescopic element 71, a second telescopic element 72, a third telescopic element 73, a fourth telescopic element 74 and a fifth telescopic element 75.

[0105] The first telescopic element 71 , the second telescopic element 72 , the fourth telescopic element 74 and the fifth telescopic element 75 are respectively arranged around the side of the first projection unit 1 facing away from the user, and the third telescopic element 73 is arranged at the center of the side of the first projection unit 1 facing away from the user.

[0106] It can be understood that the telescopic element may include but is not limited to a telescopic rod, an electric push rod, an expansion / folding structure, a spring telescopic device, a hydraulic cylinder / pneumatic cylinder, etc.

[0107] Specifically, the degree-of-freedom mechanical control unit 7 includes five telescopic elements: a first telescopic element 71, a second telescopic element 72, a third telescopic element 73, a fourth telescopic element 74, and a fifth telescopic element 75. The first telescopic element 71, the second telescopic element 72, the fourth telescopic element 74, and the fifth telescopic element 75 are disposed around the sides of the first projection unit 1 facing away from the user, such as at the four corners or diagonal positions of the first projection unit 1. The third telescopic element 73 is disposed at the center of the side of the first projection unit 1 facing away from the user. For example, the first telescopic element 71, the second telescopic element 72, the third telescopic element 73, the fourth telescopic element 74, and the fifth telescopic element 75 are each fixedly connected to the sun visor housing 5 and movably connected to the first projection unit 1. The use of multiple telescopic elements enables more precise posture control. In one specific embodiment, for minors or petite passengers, after the sun visor's 3D display system is deployed, the eye tracking device 6 can be used to determine the passenger's eye position. This can then control the forward extension of the fourth telescopic element 74, thereby tilting the optical waveguide system to the appropriate angle and position for the passenger's optimal visual experience. The five degrees of freedom of the mechanical elements can be simultaneously extended and retracted to accommodate the forward and backward movement of passengers. The five degrees of freedom of the retractable elements can also be independently controlled to track the passenger's up, down, left, right, forward, and backward position, ensuring the best viewing experience in real time.

[0108] The present application provides a 3D display control method for the above-mentioned vehicle sun visor assembly, comprising:

[0109] Get the user's eye position;

[0110] The positions of the first viewpoint and the second viewpoint are adjusted according to the user's eye position.

[0111] Specifically, eye tracking device 6 detects eye position, and then adjusts degree-of-freedom mechanical control units 7 and 8 in real time based on the eye position, thereby adjusting the postures of first projection unit 1 and second projection unit 2 to adjust the positions of the first and second viewpoints. This allows for adaptation to different passenger heights and sitting postures, further enhancing the in-cabin user experience.

[0112] An embodiment of the present application provides an electronic device, including:

[0113] Memory, on which computer programs / instructions are stored;

[0114] The processor is configured to execute the computer program / instructions in the memory to implement the steps of the above-mentioned 3D display control method.

[0115] An embodiment of the present application provides a computer-readable storage medium having a computer program / instruction stored thereon. When the computer program / instruction is executed by a processor, the steps of the above-mentioned 3D display control method are implemented.

[0116] An embodiment of the present application provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the above-mentioned 3D display control method are implemented.

[0117] An embodiment of the present application provides a vehicle, which includes the electronic device as described above, or the computer-readable storage medium as described above, or the vehicle sun visor assembly as described above, or the 3D display system as described above.

[0118] In the description of this specification, the descriptions with reference to the terms "particularly", "optionally", "further", "in particular", "may be understood as", "further" and the like are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms are not intended to refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0119] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0120] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A 3D display system, characterized in that: include: A first projection unit (1), comprising a first optical engine (11) and a first optical waveguide unit (12), wherein the first optical engine (11) is configured to output a first image light of a scene, and the first optical waveguide unit (12) is configured to converge the first image light at a first viewpoint position (3) on an imaging side of the 3D display system; A second projection unit (2), the second projection unit (2) comprising a second optical engine (21) and a second optical waveguide unit (22), the second optical engine (21) being configured to output a second image light of the scene, and the second optical waveguide unit (22) being configured to converge the second image light at a second viewpoint position (4) on the imaging side of the 3D display system.

2. The system according to claim 1, wherein: The first optical waveguide unit (12) comprises a first coupling-in element (121), a first waveguide substrate (122) and a first coupling-out element (123), The first coupling element (121) is configured to couple the first image light into the first waveguide substrate (122); The first waveguide substrate (122) is configured to transmit the first image light; The first outcoupling element (123) is configured to couple the first image light to the first viewpoint position (3).

3. The system according to claim 2, characterized in that The outcoupling diffraction efficiency of the first outcoupling element (123) gradually increases in a direction from the first viewpoint position (3) to the second viewpoint position (4).

4. The system according to claim 2 or 3, characterized in that The first coupling-in element (121) and the first coupling-out element (123) are surface relief gratings or volume holographic gratings.

5. The system according to any one of claims 2 to 4, characterized in that: The first outcoupling element (123) is a one-dimensional grating or a two-dimensional grating.

6. The system according to claim 5, characterized in that The first optical waveguide unit (12) further includes a first turning element (124), the first outcoupling element (123) is a one-dimensional grating, The first turning element (24) is configured to perform optical path deflection on the first image light transmitted from the first waveguide substrate (122) and transmit the light to the first outcoupling element (123), so as to achieve pupil expansion of the first image light.

7. The system according to claim 1, wherein: The first optical engine (11) includes a first microdisplay (111) and a first collimator (112), The first micro display (111) is configured to output the first image light; The first collimator (112) is configured to convert the first image light into a multi-field collimated parallel light beam.

8. A vehicle sun visor assembly, characterized in that: include: Sun visor housing (5); The first projection unit (1) and the second projection unit (2) of the 3D display system according to any one of claims 1 to 7, wherein the first projection unit (1) and the second projection unit (2) are symmetrically arranged on the side of the sun visor housing (5) facing the user.

9. The assembly according to claim 8, characterized in that The component further comprises an eye tracking device (6), which is arranged on the side of the sun visor housing (5) facing the user, and is configured to obtain the eye position of the user.

10. The assembly according to any one of claims 8 or 9, characterized in that The assembly further comprises a first multi-degree-of-freedom mechanical control unit (7) and a second multi-degree-of-freedom mechanical control unit (8), The sun visor housing (5) is connected to the first projection unit (1) via the first multi-degree-of-freedom mechanical control unit (7); The sun visor housing (5) is connected to the second projection unit (2) via the second multi-degree-of-freedom mechanical control unit (8); The multi-degree-of-freedom mechanical control unit (7) is configured to adjust the posture of the first projection unit (1), and the second multi-degree-of-freedom mechanical control unit (8) is configured to adjust the posture of the second projection unit (2).

11. The assembly according to claim 10, characterized in that The first multi-degree-of-freedom mechanical control unit (7) comprises a first telescopic element (71), a second telescopic element (72), a third telescopic element (73), a fourth telescopic element (74) and a fifth telescopic element (75), The first telescopic element (71), the second telescopic element (72), the fourth telescopic element (74) and the fifth telescopic element (75) are respectively arranged on the four sides of the first projection unit (1) facing away from the user, and the third telescopic element (73) is arranged at the center of the first projection unit (1) facing away from the user.

12. A 3D display control method, used for the vehicle sun visor assembly according to any one of claims 8 to 11, characterized in that: include: Get the user's eye position; The positions of the first viewpoint and the second viewpoint are adjusted according to the eye position of the user.

13. An electronic device, characterized in that: include: Memory, on which computer programs / instructions are stored; A processor is configured to execute the computer program / instructions in the memory to implement the steps of the 3D display control method according to claim 12.

14. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the 3D display control method according to claims 1-12 are implemented.

15. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the 3D display control method according to claims 1-12 are implemented.

16. A vehicle, characterized in that: The vehicle comprises the electronic device according to claim 13, or the computer-readable storage medium according to claim 14, or the vehicle sun visor assembly according to any one of claims 8-11, or the 3D display system according to any one of claims 1-7.

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