Vehicle-mounted digital advertisement system

Abstract

A vehicle-mounted digital advertisement system comprises a rear projection film, a sucker fixing device, a central control end advertisement data distribution device, a central control end advertisement data communication device, a vehicle-mounted end advertisement data communication device and a digital projector. The rear projection film is connected with the sucker fixer adsorbed on the vehicle window glass so as to be fixed on the inner side or the outer side of the vehicle window glass; a data transmission path is established between the vehicle-mounted end advertisement data communication device and the central control end advertisement data communication device in a wireless communication mode; the central control end advertisement data communication device receives image data sent by the central control end advertisement data distribution device and transmits the image data to the vehicle-mounted end advertisement data communication device through the data transmission path; the vehicle-mounted end advertisement data communication device transmits image data to a digital projector arranged in a vehicle, and the digital projector projects an image to a rear projection film; therefore, people can see the advertisement projected on the rear projection film; the system is convenient to install and use when the automobile is parked, and the automobile can be normally driven after the rear projection film is detached.

Description

Technical Field

[0001] The utility model relates to an advertisement system, in particular to a vehicle-mounted digital advertisement system. Background Art

[0002] In modern society, cars have become an indispensable means of transportation for people's daily travel, and the number of cars is increasing. Cars are generally parked in garages, parking lots, and roadside parking spaces; most of the above places are public places with frequent traffic. When a car is parked, using the car to carry out advertising has broad commercial value.

[0003] Currently, there is still a lack of an in-vehicle digital advertising system that is easy to install and use when the car is parked, and easy to dismantle without affecting the driving of the vehicle. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a vehicle-mounted digital advertising system, which includes a rear projection film, a suction cup fixture, a central control end advertising data distribution device, a central control end advertising data communication device, a vehicle-mounted advertising data communication device, and a digital projector; the digital projector is a digital projector with a rear projection function; the suction cup fixture is adsorbed on the vehicle window glass through its vacuum suction cup, and the rear projection film is fixed to the inner side or outer side of the vehicle window glass by connecting with the suction cup fixture adsorbed on the vehicle window glass; the vehicle-mounted advertising data communication device establishes data with the central control end advertising data communication device through wireless communication. Transmission path; the central control end advertising data communication device receives the image data sent by the central control end advertising data distribution device and transmits it to the vehicle-mounted advertising data communication device through the data transmission path; then the vehicle-mounted advertising data communication device transmits the image data to a digital projector installed in the vehicle, and the digital projector converts the received image data into an image and projects it onto the rear projection film; in this way, people outside the vehicle can watch the image on the rear projection film, and the purpose of advertising display is achieved; the rear projection film can be removed by removing the suction cup fixture from the vehicle window glass, and the vehicle can be driven normally after the rear projection film is removed.

[0005] Preferably, the suction cup fixture is adsorbed on the inner surface of the vehicle window glass through its vacuum suction cup; the rear projection film is fixed on the inner side of the vehicle window glass by connecting with the suction cup fixture adsorbed on the inner surface of the vehicle window glass.

[0006] Furthermore, the suction cup fixture is adsorbed on the inner surface of the vehicle's front windshield through its vacuum suction cup; the rear projection film is fixed to the inner side of the vehicle's front windshield by connecting with the suction cup fixture adsorbed on the inner surface of the vehicle's front windshield.

[0007] Furthermore, the rear projection film is fixed to the inner side of the vehicle's front windshield and is located within 20 cm from the vehicle's front windshield by connecting with the suction cup fixture adsorbed on the inner surface of the vehicle's front windshield.

[0008] Preferably, the vehicle-mounted digital advertising system further comprises an elastic connector; the rear projection film is connected to the suction cup holder via the elastic connector; under the elastic force provided by the elastic connector, the rear projection film fixed to the side of the vehicle window glass is in a taut and flat state.

[0009] Furthermore, the vehicle-mounted digital advertising system also includes a reel with a buckle and a rear-projection film side bar rod; the reel with the buckle has an installation slot opened axially on the outer wall of its shaft tube; the inner walls of the reel at both ends of the installation slot are fixedly connected with the buckles in the reel; the rear-projection film is rectangular, and its two short sides are respectively fixedly connected to the rod walls of two rear-projection film side bar rods; both ends of the rear-projection film side bar rods are fixedly connected with the elastic connecting parts; the two rear-projection film side bar rods to which the short sides of the rear-projection film are fixedly connected have a rear-projection film that can be embedded in the reel shaft tube through the installation slot, and the two ends of the rear-projection film can also be fixedly connected to the buckles at both ends of the installation slot on the inner wall of the reel by snapping. The side bar rod; the connection between the side bar rod of the back-projection film and the buckle is a detachable connection; in this way, when the side bar rod is clamped in the buckle, the back-projection film can be rolled up and unfolded by rolling the reel; after the back-projection film is unfolded, the side bar rod of the back-projection film can be easily taken out from the buckle, and then connected with the suction cup fixture adsorbed on the car window glass through the elastic connecting parts fixedly connected at both ends of the side bar rod of the back-projection film, so as to realize the installation of the back-projection film; the two short sides of the back-projection film are fixed on the side bar rod of the back-projection film, which can effectively prevent the back-projection film from curling; the reel can easily roll up the back-projection film, which is very beneficial for the storage of the back-projection film.

[0010] Furthermore, the elastic connecting member is a rubber ring or a spring.

[0011] Preferably, the central control end advertising data communication device includes an Internet communication device; the vehicle-mounted advertising data communication device includes a mobile Internet communication device; the data transmission path between the vehicle-mounted advertising data communication device and the central control end advertising data communication device is established by the mobile Internet communication device and the Internet communication device via Internet communication.

[0012] Furthermore, the in-vehicle digital advertising system also includes a 4G / 5G smartphone with a Bluetooth module, and the digital projector is a digital projector integrated with a Bluetooth module; the in-vehicle advertising data communication device is composed of a 4G / 5G network communication module and a Bluetooth module in the smartphone and a Bluetooth module integrated in the digital projector; the 4G / 5G network communication module in the smartphone is a mobile Internet communication device in the in-vehicle advertising data communication device; the central control end advertising data communication device transmits image data to the 4G / 5G smartphone with a Bluetooth module through the data transmission path, and the 4G / 5G smartphone with a Bluetooth module transmits the received image data to the digital projector integrated with the Bluetooth module via Bluetooth; the digital projector can then project.

[0013] Preferably, the vehicle-mounted digital advertising system also includes a vehicle-mounted advertising display effect data acquisition device, a vehicle-mounted advertising display effect data communication device, a central control end advertising display effect data communication device and a central control end advertising display effect data receiving device; the vehicle-mounted advertising display effect data communication device establishes a data transmission channel with the central control end advertising display effect data communication device through wireless communication; the vehicle-mounted advertising display effect data acquisition device captures the projection screen of the digital projector and converts the captured image into digital information and transmits it to the vehicle-mounted advertising display effect data communication device; then the vehicle-mounted advertising display effect data communication device transmits the digital information it receives to the central control end advertising display effect data communication device through the data transmission channel; then the central control end advertising display effect data communication device transmits the digital information it receives to the central control end advertising display effect data receiving device; in this way, the advertiser can monitor, record and evaluate the advertising display effect.

[0014] Furthermore, the central control end advertising display effect data communication device includes an Internet communication device; the vehicle-mounted end advertising display effect data communication device includes a mobile Internet communication device; the data transmission channel between the vehicle-mounted end advertising display effect data communication device and the central control end advertising display effect data communication device is established by the mobile Internet communication device and the Internet communication device through Internet communication.

[0015] Furthermore, the vehicle-mounted advertising display effect data collection device and the vehicle-mounted advertising display effect data communication device are the same 4G / 5G smartphone with a digital camera.

[0016] Furthermore, the Internet communication devices in the central control end advertising data communication device and the central control end advertising display effect data communication device both include wireless network cards.

[0017] Preferably, the vehicle-mounted digital advertising system further comprises a projector position adjustment device; the projector position adjustment device is a device for adjusting the position of the digital projector so that it is in a projector position (the projector position refers to: the position of the projector that meets the projection requirements).

[0018] Furthermore, the projector position adjustment device includes a metal hose bracket connected to the digital projector and / or a lockable universal ball head connected to the digital projector.

[0019] Preferably, the vehicle-mounted digital advertising system further comprises a projector fixing device; the projector fixing device is a device for fixing the digital projector at the projector position by means of a detachable fixed connection.

[0020] Furthermore, the projector fixing device includes a vacuum suction cup that uses atmospheric pressure to adsorb the vehicle so that the projector fixing device itself is fixed in the vehicle and / or a magnetic suction cup that uses magnetic force to adsorb the vehicle so that the projector fixing device itself is fixed in the vehicle.

[0021] Preferably, the vehicle-mounted digital advertising system also includes a projector posture adjustment device; the projector posture adjustment device is a device for adjusting the posture of the digital projector so that the projection image of the digital projector is projected onto the rear projection film and the projection image is in a position that meets the requirements.

[0022] Furthermore, the projector posture adjustment device includes a metal hose bracket connected to the digital projector and / or a lockable universal ball head connected to the digital projector.

[0023] Preferably, the rear projection film is a rectangular high-definition rear projection film.

[0024] Preferably, the digital projector is an ultra-short-throw high-definition digital projector or a short-throw high-definition digital projector.

[0025] The vehicle-mounted digital advertising system has a simple structure and is easy to install, which is very convenient for use when the car is parked; the back transparent film is easy to remove, and after the back transparent film is removed, the driver's field of vision will not be affected by the back transparent film, so that the driver can drive normally. In particular, when the vehicle-mounted advertising display effect data acquisition device and the vehicle-mounted advertising display effect data communication device are the same 4G / 5G smartphone with a digital camera, some devices in the vehicle-mounted digital advertising system are shared with people's existing equipment, so the advertising system is further simplified, the manufacturing cost is reduced, and the practicality is further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0027] Figure 1 Schematic diagram of the installation of the mobile advertising terminal in Example 1 (side view of the vehicle)

[0028] Figure 2 Schematic diagram of the installation of the mobile advertising terminal in Example 1 (view from inside the vehicle)

[0029] Figure 3 for Figure 1 A partial enlarged view

[0030] Figure 4 for Figure 2 Partial enlarged view of point B in the middle

[0031] Figure 5 Schematic diagram of the installation of the mobile advertising terminal in Example 2 (from the perspective of the vehicle interior)

[0032] Figure 6 for Figure 5 Partial enlargement of point C in the middle

[0033] Figure 7 Schematic diagram of the connection between the rear projection film, the rear projection film side bar, the rubber ring and the reel in Example 2 (when the rear projection film side bar and the reel are in a separated state)

[0034] Figure 8 Schematic diagram of the connection between the rear projection film, the rear projection film side bar, the rubber ring and the reel in Example 2 (when the rear projection film side bar and the reel are in a clamping state)

[0035] Figure numerals: 1a. Front windshield, 1b. Center console, 11. Rear-projection film, 12. Reel, 13. Digital projector, 131. Lens, 132. Camera, 133. Support foot, 14. Suction cup holder, 15. Rubber ring, 211. Rear-projection film, 212. Rear-projection film side bar, 22. Reel with buckle, 221. Shaft tube, 222. Buckle, 25. Rubber ring. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Each embodiment is based on the technical solution of the present invention and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0037] Example 1

[0038] The in-vehicle digital advertising system shown in this embodiment includes a mobile advertising terminal and a central control computer; Figure 1 to Figure 4 As shown, the mobile advertising terminal components include: a rear projection film 11, a reel 12, a digital projector 13, a suction cup holder 14, and a rubber ring 15. The rear projection film 11 is a high-definition rear projection film in a rectangular shape suitable for ultra-short-focus projection. The two short sides of the rear projection film 11 are respectively fixedly connected to the outer walls of the shaft tubes of the two reels 12; the reels 12 retract and release the rear projection film 11 by rolling. The shaft ends of the reels 12 are fixedly connected with rubber rings 15. The digital projector 13 is an intelligent ultra-short-focus high-definition digital projector with rear projection, side projection, automatic keystone correction, automatic focus and automatic picture screen alignment (automatic picture screen alignment means: automatically aligning the edge of the projection picture with the edge of the screen) functions, and its components include a lens 131, a camera 132, and a support foot 133. The lens 131 and the camera 132 are integrated in the projector body; in addition, a 4G network communication module (not shown) is also integrated in the projector body. The camera 132 is an intelligent digital camera with an autofocus function and a field of view that can completely cover the projection image of the lens 131. The support foot 133 is a screw connected to the projector body through a thread; four support feet 133 are respectively installed at the four corners of the bottom of the projector body, and they change the length of their protruding body by screwing in and out, thereby adjusting the height and posture of the projector body. The suction cup holder 14 is a suction cup holder with a hook at the end opposite to its rubber vacuum suction cup. The central control computer (not shown) is integrated with a wireless network card.

[0039] When installing the rear projection film 11, first fix the four suction cup holders 14 at the appropriate positions of the four corners of the inner side of the front windshield 1a of the vehicle by suction cups, then unfold the rear projection film 11, and then hang the four rubber rings 15 fixedly connected to the axial ends of the reel 12 on the hooks of the four suction cup holders 14, and make the rear projection film 11 in a flat and taut state; when installing the digital projector 13, first place it at the appropriate position of the vehicle center console 1b, adjust its direction, and then adjust the height of the digital projector 13 by rotating the supporting feet 133 so that it is in the projector position, and then adjust the posture of the digital projector 13 so that the projection picture of the digital projector 13 is projected onto the rear projection film 11, and make the projection picture in a position that meets the requirements; in this way, the installation of the mobile advertising terminal is completed.

[0040] When in use, the central control computer accesses the Internet through the wireless network card integrated therein; the digital projector 13 also accesses the Internet through the 4G network communication module integrated therein. The central control computer transmits the advertising image data to the digital projector 13 through the Internet; the digital projector 13 converts the advertising image data into an image, and projects the image onto the rear projection film 11 in rear projection mode; at the same time, the digital projector 13 also has side projection, automatic keystone correction, automatic focus and automatic screen alignment functions, which also provide basic guarantees for the quality of the advertising image; in this way, people outside the vehicle can watch the advertisement through the front windshield 1a of the vehicle, and the purpose of advertising display is achieved. In addition, the camera 132 integrated in the digital projector 13 can also shoot the projected image; the digital projector 13 converts the image shot by the camera 132 into digital information and transmits it back to the central control computer through the Internet, so that the advertiser can monitor, record and evaluate the advertising display effect.

[0041] After the advertisement display is completed, the suction cup holder 14 is removed from the car window glass to complete the disassembly of the mobile advertising terminal; after the suction cup holder 14 is disconnected from the rubber ring 15, the back projection film 11 can be rolled up by the rolling reel 12, so that the back projection film 11 is very easy to store.

[0042] In this embodiment, the central control computer is both the central control end advertising data distribution device and the central control end advertising display effect data receiving device; the wireless network card integrated in the central control computer is both the central control end advertising data communication device and the central control end advertising display effect data communication device. The 4G network communication module integrated in the digital projector 13 is both the vehicle-mounted advertising data communication device and the vehicle-mounted advertising display effect data communication device; and the camera 132 in the digital projector 13 is the vehicle-mounted advertising display effect data acquisition device; the supporting foot 133 of the digital projector 13

[0043] It is both the projector position adjustment device and the projector posture adjustment device.

[0044] In summary, the vehicle-mounted digital advertising system shown in this embodiment has the characteristics of simple structure, convenient installation and disassembly, and easy storage.

[0045] Example 2

[0046] This embodiment is basically the same as the first embodiment, and the only difference from the first embodiment is that: the reel in this embodiment is a reel with a buckle, and the components of the mobile advertising terminal in this embodiment also include a rear projection film side bar; the connection between the rear projection film and the reel in this embodiment is achieved by first fixing the rear projection film with the rear projection film side bar, and then the rear projection film side bar is snapped with the buckle in the reel with the buckle; the connection between the rear projection film and the suction cup holder in this embodiment is achieved by first fixing the rear projection film with the rear projection film side bar, and then fixing the rubber rings at both ends of the rear projection film side bar with the suction cup holder. The following only describes in detail the differences between this embodiment and the first embodiment, and omits the description of the same parts.

[0047] like Figures 5 to 8 As shown, the reel 22 with buckle is composed of a shaft tube 221 and a buckle 222. The shaft tube 221 is cylindrical, and a slit penetrating the wall is provided on the wall along the axial direction, which is the installation slit; cantilevered buckles 222 are fixedly connected to the inner wall of the shaft tube at both ends of the installation slit; the buckle 222 and the shaft tube 221 are both made of plastic and are integrally formed. The rear projection film side bar 212 is rod-shaped as a whole; the rear projection film 211 is rectangular, and its two short sides are respectively fixedly connected to the rod walls of two rear projection film side bar rods 212; rubber rings 25 are fixedly connected to both ends of the rear projection film side bar rods 212. The side bar 212 of the rear projection film fixedly connected to the short side of the rear projection film 211 can be embedded in the shaft tube 221 through the installation seam, and its two ends can be respectively connected to the buckles 222 at the two ends of the installation seam to fix itself; the connection between the side bar 212 of the rear projection film and the buckle 222 is a detachable connection; in this way, when the side bar 212 of the rear projection film is connected to the buckle 222, the rear projection film 211 can be rolled up and unfolded by rolling the reel 22 with the buckle. After the rear projection film 211 is unfolded, the side bar 212 of the rear projection film can be easily taken out from the buckle 222, and then the rubber ring 25 fixedly connected to the two ends of the side bar 212 of the rear projection film is connected to the suction cup holder fixed to the four corners of the front windshield of the vehicle by the method of Example 1, so as to realize the installation of the rear projection film 211. The disassembly method of the mobile advertising terminal in this embodiment is the same as that in Embodiment 1; after the rubber ring 25 is disconnected from the suction cup holder, the back projection film side bar 212 can be snapped into the buckle 222 of the reel 22 with the buckle, and then the reel 22 with the buckle can roll up the back projection film 211, so that the back projection film 211 is very easy to store. Both short sides of the back projection film 211 are fixed on the back projection film side bar 212, which can effectively prevent the back projection film 211 from curling. Compared with Embodiment 1, when the back projection film is installed in this embodiment, the suction cup holder fixed on the car window glass only needs to bear the weight of the back projection film and the back projection film side bar without bearing the weight of the reel, which creates conditions for reducing the mounting weight, and is very conducive to the miniaturization of the mobile advertising terminal.

[0048] Example 3

[0049] This embodiment is basically the same as Embodiment 2, and the only difference from Embodiment 2 is that the components of the mobile advertising terminal in this embodiment also include a 4G smart phone with a Bluetooth module and a digital camera, and the digital projector in this embodiment is integrated with a Bluetooth module but not an integrated 4G network communication module. Only the differences between this embodiment and Embodiment 2 are described in detail below, and the description of the same parts is omitted.

[0050] When the in-vehicle digital advertising system shown in this embodiment is in use, the digital projector communicates with the smartphone via Bluetooth, and the smartphone communicates with the central control computer via the Internet; the central control computer transmits the advertising image data to the smartphone via the Internet, and the smartphone then transmits the advertising image data to the digital projector via Bluetooth, and the digital projector can then start projection; the smartphone takes a picture of the projection screen and transmits the captured image to the central control computer via the Internet, and the information on the advertising display effect is then transmitted back.

[0051] In this embodiment, the digital camera in the smart phone is the vehicle-mounted advertising display effect data collection device; the 4G network communication module and Bluetooth module in the smart phone and the Bluetooth module integrated in the digital projector together constitute the vehicle-mounted advertising data communication device; at the same time, the 4G network communication module in the smart phone is also the vehicle-mounted advertising display effect data communication device.

[0052] In this embodiment, the vehicle-mounted advertising display effect data collection device and the vehicle-mounted advertising display effect data communication device are both the same 4G smart phone with a digital camera; and the 4G network communication module and Bluetooth module in the mobile phone are also part of the vehicle-mounted advertising data communication device; in this way, some devices in the vehicle-mounted digital advertising system shown in this embodiment are shared with people's existing equipment, so that the structure of the advertising system is simplified.

[0053] In the above three embodiments, the vehicle-mounted advertising data communication device and the vehicle-mounted advertising display effect data communication device both use a 4G network communication module to communicate with the central control communication device; in the above embodiment and other embodiments, the vehicle-mounted advertising data communication device and the vehicle-mounted advertising display effect data communication device may also use a 5G network communication module or a newer generation of mobile Internet communication modules to communicate with the central control communication device.

[0054] In the above three embodiments, the central control end advertising data communication device and the central control end advertising display effect data communication device are both wireless network cards; in the above embodiments and other embodiments, the central control end advertising data communication device and the central control end advertising display effect data communication device can also be 4G / 5G network communication modules or newer generation mobile Internet communication modules, and can also be wired network cards integrated in the central control computer.

[0055] In Example 3, the Bluetooth module is used for communication between the 4G smartphone and the digital projector; in this embodiment, a WI-FI communication module can also be used to replace the Bluetooth module integrated in the digital projector, and then WI-FI can be used to achieve communication between the 4G smartphone and the digital projector.

[0056] In the above three embodiments, the supporting feet installed at the bottom of the digital projector are both the projector position adjustment device and the projector posture adjustment device; in other embodiments, a metal hose bracket connected to the digital projector and / or a lockable universal ball head connected to the digital projector can also be used as the projector position adjustment device to adjust the position of the digital projector; a metal hose bracket connected to the digital projector and / or a lockable universal ball head connected to the digital projector can also be used as the projector posture adjustment device to adjust the posture of the projector; in other embodiments, the vehicle-mounted digital advertising system may not include a dedicated projector position adjustment device and a projector posture adjustment device, and when the digital projector is installed, the digital projector is lifted by daily-used objects carried on the vehicle to achieve the purpose of adjusting the position and posture of the digital projector.

[0057] In the above three embodiments, the digital projector is placed on the center console of the vehicle; in other embodiments, the digital projector can be placed in other locations in the vehicle (such as the center armrest box cover, seat, etc.) or integrated into the center console of the vehicle in accordance with the principle of convenient advertising image projection; in other embodiments, the vehicle-mounted digital advertising system may also include a projector fixing device that fixes the digital projector to the projector position by a detachable fixed connection; further, the projector fixing device may also include a vacuum suction cup that uses atmospheric pressure to adsorb the vehicle so that the projector fixing device itself is fixed in the vehicle and / or a magnetic suction cup that uses magnetic force to adsorb the vehicle so that the projector fixing device itself is fixed in the vehicle.

[0058] In the above three embodiments, the back-projection film is connected to the suction cup fixture through a rubber ring; in other embodiments, the back-projection film can also be directly bonded to the suction cup fixture, and after the suction cup fixture is adsorbed on the vehicle window glass, the back-projection film is fixed to the inner or outer side of the vehicle window glass through it.

[0059] In the above three embodiments, the elastic connecting members connecting the rear projection film and the suction cup holder are all rubber rings; in the above embodiment and other embodiments, the elastic connecting members may also be springs.

[0060] In the above three embodiments, the rear-projection film is fixed on the inside of the vehicle's front windshield during installation, and the digital projector is placed on the vehicle's center console; the projection distance of the digital projector is very short, so an ultra-short-focus digital projector suitable for the projection distance is selected, and the rear-projection film also uses a rear-projection film suitable for ultra-short-focus projection that matches the focal length of the digital projector; in other embodiments, digital projectors with other focal lengths that are suitable for the projection distance can also be selected according to different projection distances, and then a rear-projection film that matches the focal length of the digital projector can be selected according to the selected digital projector.

[0061] The above-mentioned embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The vehicle-mounted digital advertising system is characterized by: It comprises a rear projection film, a suction cup holder, a central control end advertising data distribution device, a central control end advertising data communication device, a vehicle-mounted end advertising data communication device, and a digital projector; the digital projector is a digital projector with a rear projection function; the suction cup holder is adsorbed on the vehicle window glass by its vacuum suction cup, and the rear projection film is fixed on the inner side or outer side of the vehicle window glass by connecting with the suction cup holder adsorbed on the vehicle window glass; the vehicle-mounted end advertising data communication device establishes a data transmission path with the central control end advertising data communication device by wireless communication; the central control end advertising data communication device receives the image data sent by the central control end advertising data distribution device and transmits it to the vehicle-mounted end advertising data communication device through the data transmission path; Then the vehicle-mounted advertising data communication device transmits the image data to the digital projector installed in the vehicle, and the digital projector converts the received image data into an image and projects it onto the rear projection film.

2. The vehicle-mounted digital advertising system according to claim 1 is characterized in that: The suction cup fixture is adsorbed on the inner surface of the vehicle's front windshield through its vacuum suction cup; the rear projection film is fixed on the inner side of the vehicle's front windshield by connecting with the suction cup fixture adsorbed on the inner surface of the vehicle's front windshield.

3. The vehicle-mounted digital advertising system according to claim 2 is characterized in that: The rear projection film is connected to the suction cup fixture adsorbed on the inner surface of the vehicle's front windshield and is fixed on the inner side of the vehicle's front windshield and is located within 20CM of the vehicle's front windshield.

4. The vehicle-mounted digital advertising system according to claim 1 is characterized in that: It also includes an elastic connecting piece; the rear projection film is connected to the suction cup fixture via the elastic connecting piece; under the elastic force provided by the elastic connecting piece, the rear projection film fixed on the side of the vehicle window glass is in a tight and flat state.

5. The vehicle-mounted digital advertising system according to claim 4 is characterized in that: It also includes a reel with a buckle and a rear-projection film edge bar; the reel with the buckle has an installation slot opened axially on the outer wall of its shaft tube; the buckles in the reel are fixedly connected to the inner walls of the reel at both ends of the installation slot; the rear-projection film is rectangular, and its two short sides are respectively fixedly connected to the rod walls of two rear-projection film edge bars; both ends of the rear-projection film edge bar are fixedly connected to the elastic connecting parts; among the two rear-projection film edge bars fixedly connected with the short sides of the rear-projection film, there is a rear-projection film edge bar that can be embedded in the reel shaft tube through the installation slot, and its two ends can also be fixedly connected to the buckles on the inner wall of the reel at both ends of the installation slot by snapping; the connection between the rear-projection film edge bar and the buckle is a detachable connection.

6. The vehicle-mounted digital advertising system according to claim 1 is characterized in that: The central control end advertising data communication device includes an Internet communication device; the vehicle-mounted advertising data communication device includes a mobile Internet communication device; the data transmission path between the vehicle-mounted advertising data communication device and the central control end advertising data communication device is established by the mobile Internet communication device and the Internet communication device through Internet communication.

7. The vehicle-mounted digital advertising system according to claim 6 is characterized in that: It also includes a 4G / 5G smartphone with a Bluetooth module, and the digital projector is a digital projector integrated with a Bluetooth module; the vehicle-mounted advertising data communication device is composed of a 4G / 5G network communication module and a Bluetooth module in the smartphone and a Bluetooth module integrated in the digital projector; the 4G / 5G network communication module in the smartphone is a mobile Internet communication device in the vehicle-mounted advertising data communication device; the central control-end advertising data communication device transmits image data to the 4G / 5G smartphone with a Bluetooth module through the data transmission path, and the 4G / 5G smartphone with a Bluetooth module transmits the received image data to the digital projector integrated with the Bluetooth module via Bluetooth.

8. The vehicle-mounted digital advertising system according to claim 1 is characterized in that: It also includes a vehicle-mounted advertising display effect data collection device, a vehicle-mounted advertising display effect data communication device, a central control end advertising display effect data communication device and a central control end advertising display effect data receiving device; the vehicle-mounted advertising display effect data communication device establishes a data transmission channel with the central control end advertising display effect data communication device through wireless communication; The vehicle-mounted advertising display effect data acquisition device captures the projection screen of the digital projector and converts the captured image into digital information and transmits it to the vehicle-mounted advertising display effect data communication device; then the vehicle-mounted advertising display effect data communication device transmits the received digital information to the central control end advertising display effect data communication device through the data transmission channel; then the central control end advertising display effect data communication device transmits the received digital information to the central control end advertising display effect data receiving device.

9. The vehicle-mounted digital advertising system according to claim 8 is characterized in that: The central control end advertising display effect data communication device includes an Internet communication device; the vehicle-mounted end advertising display effect data communication device includes a mobile Internet communication device; the data transmission channel between the vehicle-mounted end advertising display effect data communication device and the central control end advertising display effect data communication device is established by the mobile Internet communication device and the Internet communication device through Internet communication.

10. The vehicle-mounted digital advertising system according to claim 9, characterized in that: The vehicle-mounted advertising display effect data collection device and the vehicle-mounted advertising display effect data communication device are the same 4G / 5G smartphone with a digital camera.

Images