Vehicle-mounted projection system for projecting to ground

Abstract

The vehicle-mounted projection system comprises a host unit and at least one optical fiber scanning projection unit, a control unit and light source units in one-to-one correspondence with the optical fiber scanning projection units are arranged in the host unit, and light beams emitted by the light source units are coupled into first optical fibers. The first optical fiber is optically connected with a second optical fiber of the optical fiber scanning projection unit, and the control unit is electrically connected with the optical fiber scanner and the light source unit and used for controlling the light source unit to emit modulated light and controlling the optical fiber scanner to conduct two-dimensional scanning according to a preset track. The optical fiber scanning projection unit is installed on the vehicle body and emits image light towards the ground outside the vehicle. The optical fiber scanning projection unit used for emitting the image light is not provided with a light source component or a heat dissipation component, so that the installation space occupied by the optical fiber scanning projection unit is extremely small, the installation position of the optical fiber scanning projection unit is flexible, and the optical fiber scanning projection unit can be conveniently designed and deployed in a vehicle according to market requirements.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a vehicle-mounted projection system for projecting onto the ground. Background Art

[0002] With the development of the vehicle industry, vehicle-mounted projection systems have attracted increasing attention in the industry. For example, a vehicle-mounted projection system that has emerged in recent years in the vehicle industry has functions such as a ground illumination lamp function and projecting the model number or brand pattern of the vehicle, etc., and can project information such as the vehicle logo onto the ground. On the one hand, it can display information such as the vehicle brand, and on the other hand, it can play a role in illumination at night and remind pedestrians and vehicles in front of and behind the vehicle to pay attention to safety.

[0003] However, current projection devices generally use CRT (Cathode Ray Tube) projection systems, LCD (Liquid Crystal Display) projection systems, LCOS (Liquid Crystal on Silicon) projection systems, or DLP (Digital Light Processor) projection systems. Such devices generally have non-negligible volume sizes, and such devices also all have relatively large heat dissipation structures. A large installation space needs to be reserved at the position where the vehicle body installs the projection device, resulting in great limitations on the position and quantity of the projection devices installed on the entire vehicle. For example, usually, external vehicle projections are mostly installed on the door bodies of the vehicle doors and the trunk door bodies with relatively large cavity volumes. At the same time, since the heat dissipation components of traditional projection devices are structures integrally provided with the projection display components, it also becomes a problem how to dissipate heat well for each projection device. Summary of the Utility Model

[0004] Embodiments of this application provide a vehicle-mounted projection system for projecting onto the ground, so as to at least overcome the technical problem that existing vehicle-mounted projection devices are large in volume and not easy to install.

[0005] To achieve the above application objectives, embodiments of this application provide a vehicle-mounted projection system for projecting onto the ground, which includes a host unit and at least one fiber optic scanning projection unit. A control unit and a light source unit corresponding to the fiber optic scanning projection unit one by one are arranged in the host unit. The light beam emitted by the light source unit is coupled into a first optical fiber, and the first optical fiber is optically connected to a second optical fiber of the fiber optic scanning projection unit. The control unit is electrically connected to the fiber optic scanner and the light source unit respectively, and is used to control the light source unit to emit modulated light and control the fiber optic scanner to perform two-dimensional scanning along a predetermined trajectory. The fiber optic scanning projection unit is installed on the vehicle body and emits image light towards the ground outside the vehicle.

[0006] The fiber optic scanning projection unit includes a first housing. One end of the first housing is the light output end, and an imaging lens is provided at the light output end of the first housing. Inside the first housing, there is a fiber optic scanner that emits image light to the outside through the imaging lens. This structure makes the fiber optic scanning projection unit an independent component encapsulated in the first housing. It can lead out optical fibers and signal transmission lines for connecting to the light source unit and the control unit from the first housing, or photoelectric connectors, such as photoelectric plugging structures, can be provided in the first housing to achieve convenient connection and disconnection of the fiber optic scanning projection unit to the connecting optical fibers and signal transmission lines, so as to achieve connection and disconnection to the light source unit and the control unit. In this way, the convenient disassembly and assembly of the fiber optic scanning projection unit are realized, and the separate maintenance and replacement of the fiber optic scanning projection unit are achieved.

[0007] The light source unit includes a second housing. Inside the second housing, there are multiple semiconductor lasers. The light beams emitted by the semiconductor lasers are coupled into a first optical fiber through a coupling lens. The light output end of the first optical fiber is connected to the light input end of a second optical fiber of the fiber optic scanner corresponding to this light source unit. This structure makes the light source unit an independent component encapsulated in the second housing. It can lead out optical fibers and signal transmission lines for connecting to the scanning projection unit and the control unit from the second housing, or photoelectric connectors can be provided in the second housing to achieve convenient connection and disconnection of the fiber optic scanning projection unit to the connecting optical fibers and signal transmission lines, so as to achieve connection and disconnection to the scanning projection unit and the control unit. In this way, the convenient disassembly and assembly of the light source unit are realized, and the separate maintenance and replacement of the light source unit are achieved.

[0008] The fiber optic scanner includes a scanning actuator and a second optical fiber. The light output end of the second optical fiber is fixedly arranged at the free end of the scanning actuator in a cantilever-supported manner. The scanning actuator is fixedly installed inside the first housing, and the free end of the scanner actuator makes two-dimensional scanning vibrations under the drive of a drive signal.

[0009] The light input end of the second optical fiber is connected to the light output end of the first optical fiber. Of course, the second optical fibers of each fiber optic scanning projection unit are all connected to the first optical fiber led out from the light source unit corresponding to this fiber optic scanning projection unit. In a specific embodiment, the second optical fiber and the first optical fiber can be an integrally formed structure, that is, the optical fiber receiving the light output from the light source and the optical fiber installed on the fiber optic scanner are the same optical fiber. However, this makes the layout of the optical fiber very difficult. Therefore, in order to reduce the installation and layout difficulty, the first optical fiber and the second optical fiber are two independent optical fibers, and the two are connected for light guiding through an optical connection structure.

[0010] Optionally, the scanning actuator is a piezoelectric ceramic actuator. Under the drive of a drive signal, its free end makes high-frequency vibrations along a first direction to achieve line scanning, and at the same time, its free end makes low-frequency vibrations along a second direction to achieve frame scanning.

[0011] The light source control module outputs a light source modulation signal according to the received control signal to modulate each semiconductor laser in the light source unit. The light generated by each semiconductor laser in the light source unit is combined by a coupling lens and then generates the light corresponding to each pixel point in the image one by one.

[0012] The fiber optic scanning projection unit can be installed at any position where image light can be emitted to the ground outside the vehicle, and there is no limitation on this. The installation position of the fiber optic scanning projection unit can be the front side, rear side, left side, right side of the vehicle body, the car door, the trunk door, etc. Optionally, the fiber optic scanning projection unit can be installed at a position where image light is emitted to the ground outside the vehicle only when the car door or the trunk door of the vehicle is in the open state, such as installed on the side or bottom surface of the car door or the trunk door, installed on the body pillar, roof, door frame of the vehicle body, installed on the seat, the center console, etc.

[0013] Optionally, one fiber optic scanning projection unit is provided on each of the left and right sides of the front side of the vehicle body. And preferably, the fiber optic scanning projection unit is installed inside the lamp cover of the front vehicle lamp. The fiber optic scanning projection units respectively emit image light to the ground in the left front and right front of the vehicle.

[0014] Optionally, one fiber optic scanning projection unit is provided on each of the front door and the rear door on the left side of the vehicle body. The fiber optic scanning projection unit emits image light to the ground on the left side of the vehicle.

[0015] Optionally, one fiber optic scanning projection unit is provided on each of the left and right sides of the rear side of the vehicle body. The fiber optic scanning projection units respectively emit image light to the ground in the left rear and right rear of the vehicle.

[0016] When the number of installed fiber optic scanning projection units is two or more, each fiber optic scanning projection unit can respectively emit a complete image; or each fiber optic scanning projection unit emits a certain part of a complete image, and the images emitted by two or more adjacent fiber optic scanning projection units are spliced on the ground into a complete image.

[0017] The vehicle-mounted terminal is electrically connected to the control unit, and the image information to be displayed inside the vehicle-mounted terminal can be projected onto the ground through the fiber optic scanning projection unit. The image to be displayed can be any type of information, such as vehicle operation parameter information, traffic reminder information, vehicle logo icon, personalized image, text image information, etc., and can be set arbitrarily according to the actual situation.

[0018] One or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0019] The host unit can be arbitrarily selected for installation according to the actual working conditions. Since the host unit is not used for the final projection imaging, its installation position is flexible and will not affect the design inside the vehicle. Moreover, the main heat-generating components in the projection system are the light source unit and the control unit, so the heat dissipation structure is also arranged in the host unit part. And the component for emitting image light is the fiber optic scanning projection unit which is connected to the light source unit through an optical fiber. Therefore, there are neither light source components nor heat dissipation components. Combining the advantage of the small size of the fiber optic scanner itself, the installation space occupied by the fiber optic scanning projection unit is extremely small, making its installation position flexible and having a minimal impact on the installation space of the vehicle body components, providing a technical basis for the vehicle to be equipped with multiple projection imaging components, so that multiple projection imaging components can be set according to different application scenarios.

[0020] The in-vehicle projection system according to the embodiment of the present application is convenient for design and deployment inside the vehicle according to market needs, and is also convenient for maintenance and replacement according to the actual usage situation. Brief Description of the Drawings

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is a structural schematic diagram of the light source unit of the host unit and the fiber optic scanning projection unit realizing optical connection through an optical fiber;

[0023] Figure 3 is a structural schematic diagram of the fiber optic scanning projection unit;

[0024] Figure 4 is a structural schematic diagram of the light source unit;

[0025] Figure 5 is a structural schematic diagram of an embodiment of the present application;

[0026] Figure 6 is a structural schematic diagram of another embodiment of the present application;

[0027] Figure 7 is a structural schematic diagram of the third embodiment of the present application. Detailed Description of the Embodiment

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0029] Such as Figure 1 、 Figure 2As shown in the figure, an in-vehicle projection system for projecting onto the ground provided by an embodiment of the present application includes a host unit 100 and at least one fiber optic scanning projection unit 200. A control unit and a light source unit 101 corresponding one-to-one to the fiber optic scanning projection unit 200 are provided in the host unit 100. The light beam emitted by the light source unit 101 is coupled into a first optical fiber 1011. The first optical fiber 1011 is optically connected to a second optical fiber 2032 of the fiber optic scanning projection unit 200. The control unit is electrically connected to the fiber optic scanner 203 and the light source unit 101 respectively, and is used to control the light source unit 101 to emit modulated light and control the fiber optic scanner 203 to perform two-dimensional scanning along a predetermined trajectory, combined with Figures 5 - 7 As shown in the figure, the fiber optic scanning projection unit 200 is installed on the vehicle body and emits image light towards the ground outside the vehicle.

[0030] The host unit 100 can be installed at any position inside the vehicle, such as: in the engine compartment of the vehicle, inside the console housing, in the trunk or in the passenger compartment, without limitation. For example, in the passenger compartment, it can be set in the space under the seat or in the armrest box, etc. The host unit 100 can be arbitrarily selected for installation according to the actual working conditions. Since the host unit 100 is not used for the final projection imaging, its installation position is free and flexible and will not affect the internal design of the vehicle. And the main heating components in the projection system are the light source unit 101 and the control unit, so the heat dissipation structure is also arranged in the host unit 100 part. And the component for emitting image light is the fiber optic scanning projection unit 200 which is optically connected to the light source unit 101 through an optical fiber. Therefore, there are neither light source components nor heat dissipation components. Combining the advantage of the small size of the fiber optic scanner 203 itself, the installation space occupied by the fiber optic scanning projection unit 200 is extremely small, making its installation position flexible and having extremely little impact on the interior space of the vehicle and the installation space of the vehicle body components, providing a technical basis for arranging multiple projection imaging components inside the vehicle body, so that multiple projection imaging components can be set according to different application scenarios.

[0031] The in-vehicle projection system of the embodiment of the present application is convenient for design and deployment inside the vehicle according to market needs, and is also convenient for maintenance and replacement according to the actual use situation.

[0032] In the embodiments of the present application, by independently arranging a host unit and at least one fiber optic scanning projection unit, projection display can be realized in a specified area inside or outside the vehicle. For example, the host unit is arranged inside the vehicle, and one or more fiber optic scanning projection units are distributed at different positions of the vehicle, such as the outside of the vehicle body, inside the vehicle, etc. One or more fiber optic scanning projection units are connected to the light source unit and the control unit in the host unit through optical fibers. The relatively small-sized fiber optic scanning projection units can be flexibly installed at different positions of the vehicle, avoiding the impact on the overall design of vehicle body components caused by the installation of the fiber optic scanning projection units and the problem of poor projection display caused by the installation position. At the same time, a high-grade sealing structure can be adopted only for the host unit or the fiber optic scanning projection unit installed at a position with high dust and water protection requirements, while the remaining host units or fiber optic scanning projection units can adopt a lower-grade sealing structure, effectively reducing the equipment cost.

[0033] Specifically, taking the fiber optic scanning projection unit 200 arranged outside the vehicle as an example, an opening is made on the vehicle body or the vehicle rearview mirror, and the fiber optic scanning projection unit 200 is embedded in the opening. The fixing method of the fiber optic scanning projection unit 200 can be set as required. An anti-vibration structure is arranged between the fiber optic scanning projection unit 200 and the opening or inside the scanner to reduce the influence of vibration during vehicle driving. The projection range and projection quality can be ensured by adjusting the opening position, the angle relative to the horizontal plane, etc.

[0034] In the embodiments of the present application, the light source units of the host unit and the fiber optic scanning projection units are in one-to-one correspondence, and the control unit is electrically connected to each fiber optic scanning projection unit and each light source unit respectively, controlling the light source unit to emit light and controlling the fiber optic scanning projection unit to perform two-dimensional scanning to realize scanning imaging display. The embodiments of the present application realize the application of fiber optic scanning projection to the vehicle field, thus meeting various needs in the vehicle projection scenario, and the deployment of the light source unit and the fiber optic scanning projection unit in the embodiments of the present application also facilitates the maintenance and replacement of components in the vehicle projection scenario.

[0035] Such as Figure 3As shown in the figure, the fiber optic scanning projection unit 200 includes a first housing 201. One end of the first housing 201 is the light-emitting end. An imaging lens 202 is provided at the light-emitting end of the first housing 201. Inside the first housing 201, there is a fiber optic scanner 203 that emits image light to the outside through the imaging lens 202. This structure makes the fiber optic scanning projection unit 200 an independent component encapsulated in the first housing 201. It can lead out the optical fibers and signal transmission lines for connecting the light source unit 101 and the control unit from the first housing 201, or an optoelectronic connector can be provided in the first housing 201, such as an optoelectronic plugging structure, to achieve convenient connection and disconnection of the fiber optic scanning projection unit 200 with the connected optical fibers and signal transmission lines, so as to achieve connection and disconnection with the light source unit 101 and the control unit. In this way, the convenient disassembly and assembly of the fiber optic scanning projection unit 200 are realized, and the separate maintenance and replacement of the fiber optic scanning projection unit 200 are realized.

[0036] As Figure 4 shown in the figure, the light source unit 101 includes a second housing 1012. A plurality of semiconductor lasers 1013 are provided inside the second housing 1012. The light beams emitted by the semiconductor lasers 1013 are coupled into the first optical fiber 1011 through the coupling lens 1014. The light-emitting end of the first optical fiber 1011 is connected to the light-incident end of the second optical fiber 2032 of the fiber optic scanner 203 corresponding to the light source unit 101. This structure makes the light source unit 101 an independent component encapsulated in the second housing 1012. It can lead out the optical fibers and signal transmission lines for connecting the scanning projection unit 200 and the control unit from the second housing 1012, or an optoelectronic connector can be provided in the second housing 1012 to achieve convenient connection and disconnection of the fiber optic scanning projection unit 200 with the connected optical fibers and signal transmission lines, so as to achieve connection and disconnection with the scanning projection unit 200 and the control unit. In this way, the convenient disassembly and assembly of the light source unit 101 are realized, and the separate maintenance and replacement of the light source unit 101 are realized.

[0037] The coupling lens 1014 can be a focusing lens or a collimating lens 1015 and other optical devices that can couple the light beams emitted by the semiconductor lasers 1013 into the optical fiber to improve the coupling efficiency. As a preferred embodiment, the coupling lens 1014 in this embodiment is a focusing lens.

[0038] In this embodiment, three semiconductor lasers 1013 are provided in the second housing 1012. However, it can be understood that the number of semiconductor lasers 1013 can also be any number such as two, four, six, seven, etc. Further, in the housing of the fiber optic scanner 203, collimating lenses 1015 and filter plates 1016 are provided corresponding to each semiconductor laser 1013 one by one. The collimating lens 1015 and the filter plate 1016 are located on the optical path of the corresponding semiconductor laser 1013. The collimating lens 1015 is used to collimate the light beam emitted by the semiconductor laser 1013, and the filter plate 1016 is used to reflect the collimated light beam emitted by the corresponding semiconductor laser 1013 to the focusing lens and transmit the light beams emitted by other semiconductor lasers 1013, so as to combine the light beams emitted by each semiconductor laser 1013 into a single laser beam. The combined laser beam is focused by the focusing lens and then coupled into the optical fiber. The above structure enables different light source units 101 to have different emission colors and brightnesses. The number, color, and the number of semiconductor lasers 1013 of the same color inside it can be determined according to the needs of the light source unit 101 corresponding to the scanning projection unit 200.

[0039] The color of the semiconductor laser 1013 is R, G, or B. As a preferred embodiment, the light source unit 101 is a color light source unit 101. The colors of the three semiconductor lasers 1013 are R, G, and B respectively. The three filter plates 1016 are arranged in parallel with each other. Each filter plate 1016 is used to reflect the light beam emitted by the corresponding semiconductor laser 1013 by 90° and then emit it to the focusing lens, and transmit the light beams emitted by other semiconductor lasers 1013. Optionally, two or more semiconductor lasers 1013 of the same color can also be provided in the housing to increase the energy density of the light source. For example, when six semiconductor lasers 1013 are provided in the housing, the number of semiconductor lasers 1013 with colors of R, G, or B is two each.

[0040] In another specific implementation of the embodiments of the present application, it may further include an infrared laser for emitting an infrared beam. The beam emitted by the infrared laser is also collimated by a corresponding collimating lens, reflected by a filter, and then emitted to a focusing lens. The infrared light can be used for feedback correction of the projected image, or for identifying whether there is a person within the projection range to prevent the laser from hurting people's eyes. For example, when it is detected that there is a person within the projection range, the projection is stopped or the lens assembly is instructed to close the aperture. Specifically, the micro motor is controlled by the infrared recognition result, or a structure that can be opened and closed is provided on the vehicle body, and the micro motor is controlled by the infrared recognition result. The infrared light in the embodiments of the present application can also be replaced by light sources in other bands. Selecting invisible light sources can avoid the influence of light on the projected image. Of course, when using an infrared laser, corresponding detection devices, such as infrared sensors, cameras, etc., will be correspondingly set, which will not be specifically described here. It is also feasible to use some non-visible light lasers.

[0041] As Figure 3 shown, the fiber optic scanner 203 includes a scanning actuator 2031 and a second optical fiber 2032. The light-emitting end of the second optical fiber 2032 is fixedly arranged at the free end of the scanning actuator 2031 in a cantilever-supported manner. The scanning actuator 2031 is fixedly installed in the first housing 201, and the free end of the scanner actuator performs two-dimensional scanning vibration under the drive of a drive signal.

[0042] The light-incident end of the second optical fiber 2032 is connected to the light-emitting end of the first optical fiber 1011. Of course, the second optical fibers 2032 of each fiber optic scanning projection unit 200 are all connected to the first optical fiber 1011 led out from the light source unit 101 corresponding to the fiber optic scanning projection unit 200. In a specific embodiment, the second optical fiber 2032 and the first optical fiber 1011 can be an integrally formed structure, that is, the optical fiber for receiving the output light of the light source and the optical fiber installed on the fiber optic scanner 203 are the same optical fiber. However, this makes the layout of the optical fiber very difficult. Therefore, in order to reduce the installation and layout difficulty, the first optical fiber 1011 and the second optical fiber 2032 are two independent optical fibers, and the two are connected and guided through an optical connection structure. The second optical fiber 2032 is a component installed in the fiber optic scanning projection unit 200. One end of the first optical fiber 1011 is optically connected to the light source unit 101, and the other end is optically connected to the second optical fiber 2032 of the corresponding fiber optic scanning projection unit 200. For the convenience of installation and layout, the first optical fiber 1011 can be an independent component with optical connection structures provided at both ends; it can also be a component with one end fixedly installed in the light source unit 101 and the other end having an optical connection structure; it can also be a component with one end fixedly installed in the fiber optic scanning projection unit 200 and the other end having an optical connection structure. At this time, the first optical fiber 1011 and the second optical fiber 2032 can be the same optical fiber. Further optionally, the optical connection structure can be a ceramic ferrule or a connection structure connected by optical fiber fusion.

[0043] Specifically, since the optical energy density at the connection of the fiber optic connector is relatively high, ablation is likely to occur once there is dust at the connection of the fiber optic connector. The optical connection structure of the embodiments of the present application can also be provided with a lens (e.g., a collimating device) between the first optical fiber 1011 and the second optical fiber 2032. Under the same sealing conditions, the optical energy density at the connection of the fiber optic connector can be reduced, so that the influence of dust on the optical connection structure is small, and the occurrence of ablation problems is reduced.

[0044] Optionally, the scanning actuator 2031 is a piezoelectric ceramic actuator. Under the drive of a drive signal, the free end of the piezoelectric ceramic actuator vibrates at a high frequency along a first direction to achieve line scanning, and at the same time, the free end vibrates at a low frequency along a second direction to achieve frame scanning. Further preferably, a vibration sensor for collecting the forced vibration signal of the first housing is provided inside the first housing. The vibration sensor respectively collects the forced vibration signals in the first direction and the second direction, and the vibration sensor is electrically connected to the control unit. The control unit generates a correction control signal according to the forced vibration signals in the first direction and the second direction to drive the fiber optic scanner 203, and controls the two-dimensional scanning of the fiber optic scanner 203 to cancel the interference of the forced vibration signal. Thereby, the fiber optic scanning projection unit 200 has good anti-seismic performance.

[0045] The control unit includes a processor, an image storage unit, a light source control module, a scanning drive module, a readable storage medium, an image storage unit, and a first-in first-out memory FIFO.

[0046] The readable storage medium stores a marking signal, and the marking signal is used to mark the scanning direction of the fiber cantilever of the second optical fiber 2032 in three-dimensional space. A program is stored on the storage medium, and when the program is executed by the processor, the following steps are implemented:

[0047] Send an electrical control signal (i.e., a drive signal) to the scanning drive module to drive the fiber optic scanner 203, and control the fiber cantilever in the fiber optic scanner 203 to perform a scanning motion along a predetermined two-dimensional scanning trajectory (e.g., spiral scanning, raster scanning, Lissajous scanning);

[0048] Starting from obtaining the image output start signal, read the image data of the current display image from the image storage unit according to the pixel point scanning order corresponding to the marking signal;

[0049] Write the image data of the current display image into the first-in first-out memory FIFO according to the pixel point scanning order;

[0050] Send an electrical control signal to the light source control module to control the light source unit 101, and control the light source unit 101 to sequentially output the light corresponding to each pixel point in the current display image according to the image data in the FIFO, so that the light output by the light source completely matches the fiber optic scanning trajectory and forms an image on the projection surface.

[0051] Specifically, the light source control module outputs a light source modulation signal according to the received control signal to modulate each semiconductor laser 1013 in the light source unit 101. The light generated by each semiconductor laser 1013 in the light source unit 101 is combined by the coupling lens 1014 and then sequentially generates the light corresponding to each pixel point in the image.

[0052] The fiber optic scanning projection unit 200 can be installed at any position where image light can be emitted to the ground outside the vehicle, and there is no restriction on this. As mentioned above, the fiber optic scanning projection unit 200 does not have a light source and a heat dissipation structure, so its volume is extremely small, the installation location can be widely selected, and two or more fiber optic scanning projection units 200 can be set according to actual needs. For example, the installation position of the fiber optic scanning projection unit 200 can be the front side, rear side, left side, right side of the vehicle body, the car door, the trunk door, etc. Alternatively, the fiber optic scanning projection unit 200 can be installed at a position where image light is emitted to the ground outside the vehicle only when the car door or the trunk door is in the open state, such as installed on the side or bottom surface of the car door or the trunk door, installed at positions such as the pillar of the vehicle body, the roof, the door frame, etc., installed at positions such as the seat, the center console, etc.

[0053] As Figure 5 shown in the embodiment, one fiber optic scanning projection unit 200 is provided on each of the left and right sides of the front side of the vehicle body. And preferably, the fiber optic scanning projection unit 200 is installed in the lamp cover of the front headlight. The fiber optic scanning projection unit 200 emits image light to the ground in front of the left side and the ground in front of the right side of the vehicle respectively. As Figure 6 shown in the embodiment, one fiber optic scanning projection unit 200 is provided on each of the front door and the rear door on the left side of the vehicle body. The fiber optic scanning projection unit 200 emits image light to the ground on the left side of the vehicle. As Figure 7 shown in the embodiment, one fiber optic scanning projection unit 200 is provided on each of the left and right sides of the rear side of the vehicle body. The fiber optic scanning projection unit 200 emits image light to the ground in the left rear and the ground in the right rear of the vehicle respectively.

[0054] When the number of installed fiber optic scanning projection units 200 is two or more, each fiber optic scanning projection unit 200 can emit a complete image respectively; or each fiber optic scanning projection unit 200 emits a certain part of a complete image, and the images emitted by two or more adjacent fiber optic scanning projection units 200 are spliced together on the ground to form a complete image.

[0055] The vehicle-mounted terminal is electrically connected to the control unit, and the image information to be displayed inside the vehicle-mounted terminal can be projected onto the ground through the fiber optic scanning projection unit 200. The image to be displayed can be any type of information, such as vehicle operation parameter information, passing reminder information, vehicle logo icons, personalized images, text image information, etc., and can be set arbitrarily according to the actual situation.

[0056] It should be noted that the above embodiments are illustrative of the present application rather than restrictive of the present application, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "including" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, and third, etc. does not denote any order and these words can be interpreted as names.

[0057] All features disclosed in this specification, except for mutually exclusive features, can be combined in any way.

[0058] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless specifically stated otherwise, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated otherwise, each feature is only an example of a series of equivalent or similar features.

[0059] The present application is not limited to the foregoing specific embodiments. The present application extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A vehicle-mounted projection system for projecting onto the ground, characterized in that, It includes a host unit and at least one fiber optic scanning projection unit. A control unit and a light source unit corresponding to the fiber optic scanning projection unit one by one are arranged in the host unit. The light beam emitted by the light source unit is coupled into the first optical fiber. The first optical fiber is optically connected to the second optical fiber of the fiber optic scanning projection unit. The control unit is electrically connected to the fiber optic scanner and the light source unit respectively, and is used to control the light source unit to emit modulated light and control the fiber optic scanner to perform two-dimensional scanning along a predetermined trajectory. The fiber optic scanning projection unit is installed on the vehicle body and emits image light towards the ground outside the vehicle.

2. The vehicle-mounted projection system for projecting onto the ground according to claim 1, wherein, The fiber optic scanning projection unit is installed at a position where it emits image light towards the ground outside the vehicle only when the vehicle door or trunk door is in an open state.

3. The vehicle-mounted projection system for projecting onto the ground according to claim 1, wherein, One fiber optic scanning projection unit is arranged on each of the left and right sides of the front side of the vehicle body.

4. The vehicle-mounted projection system for projecting onto the ground according to claim 3, characterized in that, The fiber optic scanning projection unit is installed in the lamp cover of the front headlight. The fiber optic scanning projection unit emits image light towards the ground in the left front and right front of the vehicle respectively.

5. The vehicle-mounted projection system for projecting onto the ground according to claim 1, wherein, One fiber optic scanning projection unit is arranged on each of the front door and the rear door on the left side of the vehicle body. The fiber optic scanning projection unit emits image light towards the ground on the left side of the vehicle.

6. The vehicle-mounted projection system for projecting onto the ground according to claim 1, characterized in that, One fiber optic scanning projection unit is arranged on each of the left and right sides of the rear side of the vehicle body. The fiber optic scanning projection unit emits image light towards the ground in the left rear and right rear of the vehicle respectively.

7. The vehicle-mounted projection system for projecting onto the ground according to claim 1, wherein, When the number of installed fiber optic scanning projection units is two or more, each fiber optic scanning projection unit emits a complete image respectively, or each fiber optic scanning projection unit emits a certain part of a complete image, and the images emitted by two or more fiber optic scanning projection units are spliced into a complete image on the vehicle roof.

8. The vehicle-mounted projection system for projecting onto the ground according to claim 1, wherein The fiber optic scanning projection unit includes a first housing. One end of the first housing is the light-emitting end. An imaging lens is arranged at the light-emitting end of the first housing. A fiber optic scanner that emits image light to the outside through the imaging lens is arranged inside the first housing.

9. The vehicle-mounted projection system for projecting onto the ground according to claim 8, characterized in that, The light source unit includes a second housing. A plurality of semiconductor lasers are arranged in the second housing. The light beam emitted by the semiconductor lasers is coupled into the first optical fiber through a coupling lens. The light-emitting end of the first optical fiber is connected to the light-incident end of the second optical fiber of the fiber optic scanner corresponding to this light source unit.

10. The vehicle-mounted projection system for projecting onto the ground according to claim 9, characterized in that, The fiber optic scanner includes a scanning actuator and a second optical fiber. The light-emitting end of the second optical fiber is fixedly arranged at the free end of the scanning actuator in a cantilever-supported manner. The scanning actuator is fixedly installed inside the first housing. The free end of the scanning actuator performs two-dimensional scanning vibration under the drive of a drive signal.

11. The vehicle-mounted projection system for projecting onto the ground according to claim 10, characterized in that, The scanning actuator is a piezoelectric ceramic actuator. Under the drive of a drive signal, its free end performs high-frequency vibration along the first direction to achieve line scanning, and at the same time its free end performs low-frequency vibration along the second direction to achieve frame scanning.

Images