Vehicle-mounted in-vehicle projection curtain projection system

Abstract

The utility model discloses a vehicle-mounted in-vehicle projection curtain projection system which comprises a curtain arranged in a vehicle body, 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 optical fiber scanning projection unit is installed in the vehicle body and emits image light towards the curtain. 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 technology, and particularly to an in-vehicle projection screen projection system for vehicles. Background Art

[0002] With the improvement of users' functional requirements for vehicle ride comfort, vehicle driving safety, vehicle information display, etc., some current vehicles are equipped with in-vehicle and out-of-vehicle projection devices to meet various image display needs. However, the problem that comes with this is that 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 a non-negligible volume size, and such devices also all have a relatively large heat dissipation structure.

[0003] Therefore, whether the projection device is installed on the seat, roof or center console inside the vehicle body, or the projection device is installed outside the vehicle body for external projection display, it faces great installation difficulties. When installed inside the vehicle body, since the projection device needs to project an image onto the display interface, it can only be installed on the outer surface of the in-vehicle components, which makes it difficult not to affect the performance, shape and appearance of the in-vehicle components, occupies the already narrow space inside the vehicle, and is also likely to affect the actions of passengers getting on and off the vehicle or their actions inside the vehicle. When installed outside the vehicle body, a large-volume installation cavity needs to be reserved for it at the installation positions such as the car door, engine compartment or trunk. At the same time, due to the limited flexibility of the installation position and the limited volume of the installation position, it is difficult to enable the projection device to have good heat dissipation performance. Vehicles have become a conventional means of transportation for people's daily travel, and people's attention to aspects such as driving safety and convenience is also increasing. Summary of the Utility Model

[0004] The embodiments of this application provide an in-vehicle projection screen projection system for vehicles, so as to at least overcome the technical problem that existing in-vehicle projection devices are large in volume and difficult to install.

[0005] To achieve the above application objectives, the embodiments of the present application provide a vehicle-mounted in-vehicle projection screen projection system, which includes a screen, a host unit, and at least one fiber optic scanning projection unit disposed inside the vehicle body. A control unit and a light source unit corresponding to the fiber optic scanning projection unit one by one are provided inside 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 inside the vehicle body and emits image light towards the screen.

[0006] The fiber optic scanning projection unit includes a first housing, one end of the first housing is a light-emitting end, an imaging lens is provided at the light-emitting end of the first housing, and a fiber optic scanner that emits image light to the outside through the imaging lens is provided inside the first housing.

[0007] The light source unit includes a second housing, and a plurality of semiconductor lasers are provided inside the second housing. The light beam emitted by the semiconductor lasers is coupled into the first optical fiber through a coupling lens, and 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 the light source unit.

[0008] The coupling lens can be a focusing lens or a collimating lens, etc., which are optical devices capable of coupling the light beam emitted by the semiconductor lasers into the optical fiber to improve the coupling efficiency. As a preferred embodiment, the coupling lens in this embodiment is a focusing lens.

[0009] The fiber optic scanner includes a scanning actuator and a second optical fiber. The light-emitting end of the second optical fiber is fixedly provided 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 performs two-dimensional scanning vibration under the drive of a drive signal.

[0010] The light incident 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 scanning projection unit are all connected to the first optical fiber led out from the light source unit corresponding to that fiber 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 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 by an optical connection structure to conduct light. The second optical fiber is a component installed in the fiber scanning projection unit. One end of the first optical fiber is optically connected to the light source unit, and the other end is optically connected to the second optical fiber of the corresponding fiber scanning projection unit. For the convenience of installation and layout, the first optical fiber can either be an independent component with optical connection structures provided at both ends; or be a component with one end fixedly installed in the light source unit and the other end having an optical connection structure; or be a component with one end fixedly installed in the fiber scanning projection unit and the other end having an optical connection structure. In this case, the first optical fiber and the second optical fiber 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 splicing.

[0011] Optionally, the scanning actuator 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 the first direction to achieve line scanning, and at the same time, the free end vibrates at a low frequency along the second direction to achieve frame scanning.

[0012] 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.

[0013] 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 in three-dimensional space. The storage medium stores a program, and when the program is executed by the processor, the following steps are implemented:

[0014] Send an electrical control signal (i.e., a drive signal) to the scanning drive module to drive the fiber scanner, and control the fiber cantilever in the fiber scanner to perform a scanning motion along a predetermined two-dimensional scanning trajectory (such as: spiral scanning, raster scanning, Lissajous scanning);

[0015] Starting from obtaining an 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;

[0016] Write the image data of the current display image into the first-in-first-out memory FIFO according to the pixel point scanning order;

[0017] Send an electrical control signal to the light source control module to control the light source unit, and control the light source unit 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.

[0018] Specifically, 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 sequentially generates the light corresponding to each pixel point in the image.

[0019] Preferably, the curtain extends in the vertical direction and is arranged parallel to the rear side of the front row seats. Further preferably, the curtain is a projection screen that can be unfolded and retracted. For example, the upper end of the curtain is fixedly connected to a rotating shaft, and the rotating shaft is optionally installed on the ceiling of the carriage. The rotating shaft is connected to a driving motor that drives its rotation, and the retraction and unfolding of the curtain are realized by the forward or reverse rotation of the motor.

[0020] The fiber optic scanning projection unit can be installed at any position where image light can be emitted to the curtain, and there is no limitation on this. As described above, the fiber optic scanning projection unit does not have a light source and a heat dissipation structure, so its volume is extremely small, there is no noise, the installation location can be widely selected, and two or more fiber optic scanning projection units can be set according to actual needs.

[0021] For example, the installation position of the fiber optic scanning projection unit can be the ceiling of the carriage, the vehicle body column, the top of the seat, etc.

[0022] 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 can emit 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 roof.

[0023] Optionally, the controller of the curtain is electrically connected to the vehicle-mounted terminal. The controller is used to control the unfolding and retraction of the curtain. When roof projection display is required, the vehicle-mounted terminal sends a control signal to the controller, and the controller controls the curtain to unfold. At the same time, the vehicle-mounted terminal sends a signal to the control unit, and the image information to be displayed can be projected onto the unfolded curtain through the fiber optic scanning projection unit.

[0024] One or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0025] 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. And 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 set in the host unit part. The component for emitting image light is the fiber optic scanning projection unit which is connected to the light source unit through optical fibers. 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 extremely little impact on the installation space inside the vehicle and on the vehicle body components. This enables the vehicle to have the 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.

[0026] The vehicle-mounted 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 use situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the connection structure between the host unit and the fiber optic scanning projection unit of the present application;

[0028] Figure 2 It is a schematic diagram of the structure for the fiber optic scanning projection unit to emit image light to the screen;

[0029] Figure 3 It is a schematic diagram of the structure of the light source unit;

[0030] Figure 4 It is a schematic diagram of the structure of the fiber optic scanning projection unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the 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 creative efforts shall fall within the protection scope of the present application.

[0032] Such as Figure 1 、 Figure 2As shown in the figure, an in-vehicle projection screen projection system provided by an embodiment of the present application includes a screen 300, a host unit 100, and at least one fiber optic scanning projection unit 200 disposed inside the vehicle body. A control unit and a light source unit 101 corresponding to the fiber optic scanning projection unit 200 one by one are disposed inside the host unit 100. The light beam emitted by the light source unit 101 is coupled into a first optical fiber 1011, and 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 respectively, and is used to control the light source unit to emit modulated light and control the fiber optic scanner 203 to perform two-dimensional scanning along a predetermined trajectory. The fiber optic scanning projection unit 200 is installed inside the vehicle body and emits image light toward the screen 300.

[0033] The host unit 100 can be installed at any position inside the vehicle body, such as: inside the engine compartment of the vehicle, inside the console housing, inside the trunk, or inside the driver and passenger compartment, without limitation. Inside the driver and passenger compartment, it can be set in the space under the seat or inside 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 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 set in the host unit 100 part. And the component for emitting image light is the fiber optic scanning projection unit 200 which is 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, enabling the vehicle to have the technical basis for arranging multiple projection imaging components inside the vehicle body, so as to set multiple projection imaging components according to different application scenarios.

[0034] By independently setting the host unit and at least one fiber optic scanning projection unit in the embodiment of the present application, and connecting the fiber optic scanning projection unit to the light source unit and the control unit in the host unit through an optical fiber, the fiber optic scanning projection unit with a relatively small volume can be flexibly installed at different positions of the vehicle, avoiding the problem of affecting the overall design of the vehicle body components due to the installation of the fiber optic scanning projection unit and the poor projection display caused by the installation position. At the same time, a high-grade sealing structure can be used only for the host unit or the fiber optic scanning projection unit installed at positions with higher dust and waterproof requirements, while the remaining host units or fiber optic scanning projection units can use a lower-grade sealing structure, effectively reducing the equipment cost.

[0035] In the embodiments of the present application, the light source units and the fiber optic scanning projection units of the host unit 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 achieve scanning imaging display. The embodiments of the present application realize the application of fiber optic scanning projection in the vehicle field, and the deployment of the light source unit and the fiber optic scanning projection unit also facilitates the maintenance and replacement of components in the vehicle projection scenario.

[0036] As Figure 3 shown, 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, such as an optoelectronic plug-in structure, can be provided on the first housing 201 to achieve the 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 the 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 individual maintenance and replacement of the fiber optic scanning projection unit 200 are realized.

[0037] As Figure 4 shown, 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 on the second housing 1012 to achieve the 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 the 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 individual maintenance and replacement of the light source unit 101 are realized.

[0038] The coupling lens 1014 can be a focusing lens or an optical device such as a collimating lens 1015 that can couple the light beam emitted by the semiconductor laser 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.

[0039] 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 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.

[0040] 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.

[0041] In another specific implementation of the embodiment of the present application, it may further include an infrared light laser for emitting an infrared light beam. The beam emitted by the infrared light 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 embodiment of the present application can also be replaced by light sources of other bands, and selecting an invisible light source can avoid the influence of light on the projected image. Of course, when using an infrared light laser, corresponding detection devices, such as infrared sensors, cameras, etc., will be correspondingly provided, which will not be specifically described here. It is also feasible to use some non-visible light lasers.

[0042] As Figure 3 shown, the fiber optic scanner 203 includes a scanning actuator 2031 and a second optical fiber 2032. The light output 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.

[0043] The light input end of the second optical fiber 2032 is connected to the light output 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 light output of the light source and the optical fiber installed on the fiber optic scanner 203 are the same optical fiber. However, this makes the laying of the optical fiber very difficult. Therefore, in order to reduce the installation and laying 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 laying, the first optical fiber 1011 can either be an independent component with optical connection structures provided at both ends; or a component with one end fixedly installed in the light source unit 101 and the other end having an optical connection structure; or a component with one end fixedly installed in the fiber optic scanning projection unit 200 and the other end having an optical connection structure. In this case, 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 fiber fusion splicing.

[0044] Specifically, since the optical energy density at the connection of the fiber optic connector is relatively high, once there is dust at the connection of the fiber optic connector, ablation is likely to occur. The optical connection structure of the embodiment of the present application can also be provided with a lens (for example, 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.

[0045] 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 arranged in the first housing. The vibration sensor respectively collects the forced vibration signals in the first direction and the second direction. 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. Thus, the fiber optic scanning projection unit 200 has good anti-seismic performance.

[0046] 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.

[0047] A marking signal is stored on the readable storage medium. 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. When the program is executed by the processor, the following steps are implemented:

[0048] 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 (such as: spiral scanning, raster scanning, Lissajous scanning);

[0049] 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;

[0050] Write the image data of the current display image into the first-in first-out memory FIFO according to the pixel point scanning order;

[0051] An electrical control signal is sent to the light source control module to control the light source unit 101, and the light source unit 101 is controlled 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 optical fiber scanning trajectory, and an image is formed on the projection surface. The projection surface is a medium surface that forms an image through transmission or reflection.

[0052] 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 to generate the light corresponding to each pixel point in the image one by one.

[0053] As a preferred embodiment, the curtain 300 extends in the vertical direction and is arranged in parallel at the rear side of the front row seats. Further preferably, the curtain 300 is a projection screen that can be unfolded and retracted. For example, the upper end of the curtain 300 is fixedly connected to a rotating shaft, and the rotating shaft is optionally installed on the ceiling of the carriage. The rotating shaft is connected to a driving motor that drives its rotation, and the retraction and unfolding of the curtain 300 are realized by the forward or reverse rotation of the motor.

[0054] The fiber optic scanning projection unit 200 can be installed at any position where image light can be emitted to the curtain 300, and there is no limitation on this. As described 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, there is no noise, the installation location can be widely selected, and two or more fiber optic scanning projection units 200 can be set according to actual needs.

[0055] For example, the installation position of the fiber optic scanning projection unit 200 can be the carriage ceiling, the vehicle body column, the top of the seat, etc.

[0056] 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 can emit a certain part of a complete image, and the images emitted by two or more fiber optic scanning projection units 200 are spliced into a complete image on the roof.

[0057] Optionally, the controller of the curtain 300 is electrically connected to the vehicle-mounted terminal. The controller is used to control the unfolding and retraction of the curtain 300. When roof projection display is required, the vehicle-mounted terminal sends a control signal to the controller, and the controller controls the curtain 300 to unfold. At the same time, the vehicle-mounted terminal sends a signal to the control unit, and the image information to be displayed can be projected onto the unfolded curtain 300 through the fiber optic scanning projection unit 200.

[0058] It should be noted that the above embodiments are illustrative of the present application rather than restrictive thereof, 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.

[0059] All features disclosed in this specification, except mutually exclusive features, can be combined in any manner.

[0060] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless specifically recited, may be replaced by other equivalent or similar purpose alternative features. That is, unless specifically recited, each feature is only an example of a series of equivalent or similar features.

[0061] The present application is not limited to the specific embodiments described above. The present application extends to any new feature or any new combination disclosed in this specification, as well as to any new method or process step or any new combination disclosed.

Claims

1. A vehicle-mounted in-vehicle projection screen projection system, characterized in that, It includes a curtain, a host unit and at least one fiber optic scanning projection unit disposed inside the vehicle body. A control unit and a light source unit corresponding one-to-one to the fiber optic scanning projection unit are provided inside 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 inside the vehicle body and emits image light towards the curtain.

2. The on-vehicle in-vehicle projection screen projection system 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, and an imaging lens is provided 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 provided inside the first housing.

3. The on-vehicle in-vehicle projection screen projection system according to claim 2, wherein The light source unit includes a second housing. A plurality of semiconductor lasers are provided inside 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.

4. The in-vehicle projection screen projection system according to claim 3, wherein, The fiber optic scanner includes a scanning actuator and a second optical fiber. The light-emitting end of the second optical fiber is fixedly provided 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 performs two-dimensional scanning vibration under the drive of a drive signal.

5. The on-vehicle in-vehicle projection screen projection system according to claim 4, wherein The light-incident end of the second optical fiber is connected to the light-emitting end of the first optical fiber.

6. The vehicle-mounted in-vehicle projection screen projection system according to claim 4, 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 a first direction to achieve line scanning, and at the same time its free end performs low-frequency vibration along a second direction to achieve frame scanning.

7. The on-vehicle in-vehicle projection screen projection system according to claim 1, wherein, The curtain extends in the vertical direction and is arranged in parallel at the rear side of the front row seats.

8. A vehicle in-vehicle projection screen projection system according to claim 7, characterized in that, The curtain is a projection screen that can be unfolded and rolled up.

9. The on-vehicle in-vehicle projection screen projection system according to claim 1, wherein The installation position of the fiber optic scanning projection unit includes the ceiling of the carriage, the vehicle body column or the top of the seat.

10. A vehicle-mounted in-vehicle projection screen projection system according to claim 1, characterized in that, 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 roof.

Images