Energy-saving device and method for splicing LED display screens
By setting the driver components and driving structure in the installation frame of the spliced LED display, the telescopicity of the group B spliced LED display and the movement of the group A spliced LED display, and when the light becomes dim, the installation frame is reduced and the group B is closed The display screen solves the problem of poor energy saving effect of splicing LED display screens, achieving more efficient energy saving effect and better viewing.
Patent Information
- Application Number
- CN202411534510.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-02-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the spliced LED display screens installed outdoors have poor energy saving effects, mainly because the spliced LED display screen is always in a working state and has a large power consumption.
By setting the driver components and driving structure in the installation frame of the spliced LED display, the telescopicity of the group B spliced LED display and the movement of the group A spliced LED display. When the light becomes dim, shrink into the installation frame and close Group B. Display screen to reduce power consumption.
In darker light environments, by turning off the B group spliced LED display, the power consumption of spliced LED display is significantly reduced, and the energy-saving effect is improved. At the same time, the display's appearance and effect are improved through the setting of the diffusion device and projection structure. Display effect.
Smart Images
Figure CN119400087A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of splicing LED display screens, and in particular to an energy-saving device and method for splicing LED display screens. Background Art
[0002] Splicing LED display screens can be combined together to form a larger display screen. This kind of screen usually involves both hardware and software work, including selecting the appropriate LED display screen, hardware splicing, and software configuration.
[0003] However, the energy-saving method adopted by the prior art for the spliced LED display screen installed outdoors has certain defects. The prior art spliced LED display screen installed outdoors saves energy by using the energy-saving mode. The energy-saving mode is when the light is dim at night, by reducing the power output of the spliced LED display screen, so that the brightness of the spliced LED display screen becomes dim, thereby saving energy for the spliced LED display screen. Although reducing the power output of the spliced LED display screen and dimming the brightness of the spliced LED display screen can achieve a certain energy-saving effect for the spliced LED display screen, the effect is not very good, because the spliced LED display screen is always in a working state and still has a large power consumption. Therefore, an energy-saving device and method for a spliced LED display screen are needed. Summary of the invention
[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide an energy-saving device and method for a spliced LED display screen, which is used to solve the technical problem that the energy-saving effect of the spliced LED display screen set outdoors in the prior art is poor.
[0005] The above-mentioned purpose of the present application is achieved through the following technical solutions: an energy-saving device for a spliced LED display screen, comprising a mounting frame, a mounting plate installed inside the mounting frame, a group A spliced LED display screen installed on the mounting plate, and a group B spliced LED display screen installed on the mounting plate, the mounting plate is provided with a driving component for controlling the extension and retraction of the group B spliced LED display screen, the mounting plate is provided with a driving structure for moving the group A spliced LED display screen, the group A spliced LED display screen and the group B spliced LED display screen are both provided with two columns, and the two columns of the group B spliced LED display screens are arranged on both sides of the group A spliced LED display screen.
[0006] Furthermore, the driving assembly includes a driving electric cylinder installed on a mounting plate and a telescopic mounting plate fixedly connected to an output end of the driving electric cylinder, the group B spliced LED display screen is installed on the telescopic mounting plate, and the number and position of the driving assembly correspond to the group B spliced LED display screen.
[0007] Furthermore, the driving structure includes a fixed block installed on the mounting plate, a movable block arranged on the surface of the fixed block and extending outward from the mounting frame, a sliding groove provided on the movable block, and a movable mounting plate slidably connected to the movable block through the sliding groove, and the group A spliced LED display screen is installed on the movable mounting plate, and the driving structure also includes two relatively arranged movable electric cylinders located at the upper end of the interior of the mounting frame, and a movable push piece fixedly connected to the side wall of the movable mounting plate for pushing the movable mounting plate to move is fixed on the output end of the movable electric cylinder, and the quantity and position of the driving structure correspond to the group A spliced LED display screen.
[0008] By adopting the above technical solution, when the light becomes dim at night, the driving electric cylinder can be started to make the telescopic mounting plate with the group B spliced LED display screen retract into the installation frame, leaving space for the group A spliced LED display screen to move, and then the moving electric cylinder is started to make the moving push piece push the two rows of group A spliced LED display screens to move to the position where half of the group A spliced LED display screen covers half of the group B spliced LED display screen, and at the same time, the group B spliced LED display screen is turned off, so that the group A spliced LED display screen can work. Because the light is dim at night, the intervals between the group A spliced LED display screens will be blocked by the light emitted by the group A spliced LED display screen, so that the group A spliced LED display screen can play normally, so that the group B spliced LED display screen can be turned off to save energy in a darker light environment, thereby improving the energy saving effect of the spliced LED display screen.
[0009] Furthermore, storage grooves are provided on the left and right sides of the interior of the installation frame, and a diffusion device for expanding the brightness of the A group of spliced LED display screens is provided in the storage grooves.
[0010] Furthermore, the diffusion device includes a protective shell arranged on the left and right sides of the outside of the installation frame, a control electric cylinder arranged inside the protective shell and having an output end extending into a storage groove, a connecting rod fixedly connected to the output end of the control electric cylinder, a flange arranged on the connecting rod whose number and position correspond to a column of group A spliced LED display screens, and a glass cover fixedly connected to the flange for amplifying the brightness of group A spliced LED display screens.
[0011] By adopting the above technical solution, although the position of the spliced LED display screen of group A is moved so that the emitted light can block the gap between the spliced LED display screens of group A, since the spliced LED display screen of group A itself does not increase the input of electricity, the emitted light is limited and cannot completely block the gap between the spliced LED display screens of group A. The setting of the diffusion device solves this technical problem. When the spliced LED display screen of group A completes the movement, the control electric cylinder is started to control the extension of the output end of the electric cylinder to drive the glass cover on the connecting rod to cover the spliced LED display screen of group A. The light of the spliced LED display screen of group A is enhanced and diffused by the glass cover, so that the light of the spliced LED display screen of group A is diffused wider, thereby covering the gap between the spliced LED display screens of group A and improving the visual experience of the spliced LED display screen.
[0012] Furthermore, a projection structure for improving the appearance of the spliced LED display screen is provided at the upper end of the interior of the installation frame.
[0013] Furthermore, the projection structure includes a projection motor inside a mounting frame, a rotating shaft fixedly connected to an output end of the projection motor, and a rear-projection screen rolled up on the rotating shaft, one end of the rear-projection screen is fixedly connected to the rotating shaft, an end of the rotating shaft away from the projection motor is rotatably connected to the mounting frame, and the rotating shaft is horizontally placed at the upper end inside the mounting frame.
[0014] By adopting the above technical solution, although the setting of the diffusion device makes the light of the spliced LED display screen of group A diffuse more widely and improves the viewing experience of the spliced LED display screen, the user's viewing angle of the LED display screen is three-dimensional, which causes the content played by the spliced LED display screen of group A to be very blurry when the user watches it after the light is diffused. The setting of the projection structure solves this technical problem. When the spliced LED display screen of group A is covered by the glass cover, the projection motor is started to rotate the rotating shaft, so that the rolled-up rear projection screen gradually extends to block the spliced LED display screen of group A and the glass cover, so that the light diffused by the spliced LED display screen of group A is irradiated on the rear projection screen, so that the rear projection screen displays the content played by the spliced LED display screen of group A, so that the user can watch the content played by the spliced LED display screen of group A through the rear projection screen. In this way, the content played by the spliced LED display screen of group A after the light is diffused will not be very blurry, which further improves the viewing experience of the spliced LED display screen.
[0015] Furthermore, one end of the rear projection screen away from the rotating shaft is fixedly connected with a sinker.
[0016] By adopting the above technical solution, the sinker is used to prevent the rear projection screen from folding when it is extended.
[0017] Furthermore, the protective shell is arranged at the lower end of the mounting frame and the bottom surface is flush with the bottom surface of the mounting frame.
[0018] By adopting the above technical solution, the protective shell is arranged at the lower end of the installation frame and the bottom surface is flush with the bottom surface of the installation frame, which can increase the contact area between the installation frame and the ground and improve the stability of the installation frame.
[0019] An energy-saving method for an energy-saving device for splicing LED display screens in the above technical solution comprises the following steps: S1. When the light is dim, start the driving electric cylinder to retract the telescopic mounting plate with the B group of spliced LED display screens into the installation frame, leaving space for the A group of spliced LED display screens to move; S2, start the moving electric cylinder to make the moving push piece push the two rows of group A spliced LED display screens to the position where half of group A spliced LED display screens cover half of group B spliced LED display screens, and at the same time close group B spliced LED display screens; S3, start the control electric cylinder, and the output end of the control electric cylinder extends to drive the glass cover on the connecting rod to cover the group A spliced LED display screen. The light of the group A spliced LED display screen is enhanced and diffused through the glass cover; S4. Start the projection motor to rotate the rotating shaft, so that the rolled-up rear-projection screen gradually extends to block the group A spliced LED display screen and the glass cover, so that the diffused light of the group A spliced LED display screen shines on the rear-projection screen, so that the rear-projection screen displays the content played by the group A spliced LED display screen.
[0020] In summary, the present application includes at least one of the following beneficial technical effects: By setting the driving components and the driving structure, it is achieved that when the light becomes dim at night, the driving electric cylinder can be started to make the telescopic mounting plate with the group B spliced LED display screen retract into the installation frame, leaving the moving space for the group A spliced LED display screen, and then the moving electric cylinder is started to make the moving push piece push the two rows of group A spliced LED display screens to move to the position where half of the group A spliced LED display screen covers half of the group B spliced LED display screen, and the group B spliced LED display screen is turned off at the same time, so that the group A spliced LED display screen can work. Because the light is dim at night, the intervals between the group A spliced LED display screens will be blocked by the light emitted by the group A spliced LED display screen, so that the group A spliced LED display screen can play normally, so that the group B spliced LED display screen can be turned off to save energy in a dark environment, thereby improving the energy-saving effect of the spliced LED display screen. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the overall structure of the embodiment; Figure 2 It is a detailed structural diagram of the mounting plate, drive components and drive structure; Figure 3 yes Figure 2 The structural view of the telescopic mounting plate and the movable mounting plate is hidden; Figure 4 is along Figure 1 Section view along line AA.
[0022] Figure numerals: 1. Mounting frame; 10. Mounting plate; 11. Storage groove; 2. Driving assembly; 20. Driving electric cylinder; 21. Telescopic mounting plate; 3. Driving structure; 30. Fixed block; 31. Moving block; 32. Moving mounting plate; 33. Moving electric cylinder; 34. Moving push piece; 4. Diffusion device; 40. Protective shell; 41. Control electric cylinder; 42. Connecting rod; 43. Glass cover; 5. Projection structure; 50. Rotating shaft; 51. Rear projection screen; 52. Pendant. DETAILED DESCRIPTION
[0023] The present application is further described in detail below in conjunction with the accompanying drawings.
[0024] Example, see Figure 1 , Figure 2 , Figure 3 , an energy-saving device for splicing LED display screens, comprising a mounting frame 1, a mounting plate 10 fixedly mounted inside the mounting frame 1, and two groups of splicing LED display screens, group A and group B, respectively mounted on the mounting plate 10. The two groups of display screens not only have two-column configurations, but the group B splicing LED display screens are also arranged on both sides of the group A splicing LED display screens, forming a side-by-side layout.
[0025] In order to realize flexible control of the B group of spliced LED display screens, a plurality of driving components 2 for controlling the extension and retraction of the B group of spliced LED display screens are arranged on the mounting plate 10, and the number and position of these driving components 2 correspond to the B group of spliced LED display screens. Each driving component 2 is composed of a driving electric cylinder 20 mounted on the mounting plate 10, and the output end of the driving electric cylinder 20 is fixedly connected to a telescopic mounting plate 21, and the telescopic mounting plate 21 is used to install the B group of spliced LED display screens, so that the B group of spliced LED display screens can perform telescopic movement under the drive of the driving electric cylinder 20.
[0026] At the same time, in order to allow the A group of spliced LED screens to move as needed, the mounting plate 10 is also provided with a driving structure 3 that matches the number and position of the A group of spliced LED screens. These driving structures 3 not only include a fixed block 30 mounted on the mounting plate 10 and a moving block 31 extending outward from the surface of the fixed block 30, but also a sliding groove is provided on the moving block 31, and a moving mounting plate 32 is provided that is slidably connected to the moving block 31 through the sliding groove. The moving mounting plate 32 is used to install the A group of spliced LED screens.
[0027] In order to control the left and right movement of the group A spliced LED display screen, the driving structure 3 also includes two moving electric cylinders 33. These moving electric cylinders 33 are arranged at the upper end of the interior of the mounting frame 1, and the two moving electric cylinders 33 are arranged opposite to each other. Moving push pieces 34 are fixed on their output ends. These push pieces are tightly attached to the side walls of the moving mounting plate 32 and are fixedly connected to the moving mounting plate 32. When the moving electric cylinders 33 are started, they can push the moving mounting plate 32 and the group A spliced LED display screen thereon to move.
[0028] When night falls and the light gradually dims, the driving electric cylinder 20 is started to retract the telescopic mounting plate 21 with the group B spliced LED display screen into the interior of the mounting frame 1, thereby making room for the movement of the group A spliced LED display screen. Subsequently, the moving electric cylinder 33 is started to make the moving push piece 34 push the two rows of group A spliced LED display screens to a specific position, that is, half of the group A spliced LED display screen can just cover half of the group B spliced LED display screen. At this time, the group B spliced LED display screen will be turned off, and the group A spliced LED display screen will start working.
[0029] Because the light is dark at night, when the spliced LED display screen A emits light, the light it emits will block the gap between the screens, allowing the spliced LED display screen A to play normally. In this way, in a dark environment, the spliced LED display screen B can be turned off to achieve energy saving, thereby greatly improving the energy saving performance of the entire spliced LED display screen.
[0030] Although the position of group A spliced LED display screens can be moved so that the emitted light can block the gaps between group A spliced LED display screens, since group A spliced LED display screens themselves do not increase the power input, the emitted light is limited and cannot completely block the gaps between group A spliced LED display screens.
[0031] In order to solve the problem that the light emitted by group A of spliced LED displays is limited after being moved and cannot completely cover the interval between the displays, refer to Figure 4In this embodiment, a receiving groove 11 is specially provided on the left and right sides of the interior of the mounting frame 1. In the interior of the receiving groove 11, a diffusion device 4 for expanding the brightness of the spliced LED display screen of group A is installed. The diffusion device 4 is composed of multiple key components. First, there are protective shells 40 provided on the left and right sides of the exterior of the mounting frame 1. These protective shells 40 not only play a protective role, but also provide necessary support for the internal mechanical structure. Next, in this embodiment, control electric cylinders 41 are installed inside the protective shells 40. The output ends of these control electric cylinders 41 extend into the interior of the receiving groove 11, providing a power source for subsequent components.
[0032] The output end of the control electric cylinder 41 is fixedly connected to a connecting rod 42, and the design of the connecting rod 42 enables the driving force of the control electric cylinder 41 to be evenly transmitted to other parts of the diffusion device 4. On the connecting rod 42, the embodiment is provided with flanges whose number and position correspond to a row of group A spliced LED display screens, and the flanges are fixedly connected with glass covers 43, so that they can be installed on the connecting rod 42 and keep a proper distance from the group A spliced LED display screens.
[0033] In this embodiment, a glass cover 43 capable of amplifying the light of the spliced LED display screen of group A is selected. When the spliced LED display screen of group A reaches a predetermined position, the embodiment only needs to start the control electric cylinder 41, and the output end of the control electric cylinder 41 will extend, driving the glass cover 43 located on the connecting rod 42 to slowly cover the spliced LED display screen of group A. At this time, the light emitted by the spliced LED display screen of group A will become wider and brighter after being enhanced and diffused by the glass cover 43, thereby effectively covering the interval between the display screens, greatly improving the appearance of the entire spliced LED display screen.
[0034] The diffusion device 4 not only solves the technical problems in the original design, but also enables the spliced LED display screen to maintain excellent display effects while saving energy, bringing users a more shocking visual experience.
[0035] In this embodiment, the protective shell 40 is arranged at the lower end of the mounting frame 1 and the bottom surface is flush with the bottom surface of the mounting frame 1. The protective shell 40 is arranged at the lower end of the mounting frame 1 and the bottom surface is flush with the bottom surface of the mounting frame 1, which can increase the contact area between the mounting frame 1 and the ground, thereby improving the stability of the mounting frame 1.
[0036] Although the setting of the diffusion device 4 significantly enhances the light diffusion range of the spliced LED display screen of group A, thereby improving the visual effect of the overall spliced LED display screen, the angle at which the user views the screen is three-dimensional. This characteristic causes the user to feel that the picture is blurred when viewing the content played by the spliced LED display screen of group A from certain angles after the light is diffused. In order to solve this technical problem, the present embodiment sets a projection structure 5 at the upper end of the interior of the mounting frame 1, aiming to further optimize the user's viewing experience.
[0037] The core components of the projection structure 5 include a projection motor installed inside the frame, a rotating shaft 50 firmly connected to the output end of the projection motor, and a rear projection screen 51 tightly wound on the rotating shaft 50. One end of the rear projection screen 51 is fixedly connected to the rotating shaft 50, and the other end of the rotating shaft 50 is installed on the mounting frame 1 by a rotating connection, ensuring that the rotating shaft 50 can smoothly rotate horizontally at the upper end inside the mounting frame 1.
[0038] When the A group of spliced LED display screens are completely covered by the glass cover 43, we only need to start the projection motor, and the motor will then drive the rotating shaft 50 to start rotating. As the rotating shaft 50 rotates, the rear projection screen 51 originally wound on it will gradually unfold until it completely covers the A group of spliced LED display screens and the glass cover 43 on it. At this time, the diffused light of the A group of spliced LED display screens will be projected onto the rear projection screen 51, and the screen will clearly show the content being played by the A group of spliced LED display screens.
[0039] This setting enables users to watch the content of group A spliced LED display screens through the rear projection screen 51, and ensures that the clarity of the content is not affected even after the light is diffused. The rear projection screen 51 can not only effectively reduce the problem of image blur caused by light scattering, but also provide users with a wider and more comfortable viewing angle, thereby further improving the overall viewing experience of the spliced LED display screen.
[0040] In this embodiment, a weight block 52 is fixedly connected to one end of the rear projection screen 51 away from the rotating shaft 50 , and the weight block 52 is used to prevent the rear projection screen 51 from folding when it is extended.
[0041] In this embodiment, the driving electric cylinder 20, the moving electric cylinder 33, the controlling electric cylinder 41, the projection motor and the group B spliced LED display screen can be circuit-connected to the photosensitive sensor, and the photosensitive sensor detects the brightness of external light to control the opening and closing of the driving electric cylinder 20, the moving electric cylinder 33, the controlling electric cylinder 41, the projection motor and the group B spliced LED.
[0042] Specific implementation process: when the light is dim, the driving electric cylinder 20 is started to make the telescopic mounting plate 21 with the group B spliced LED display screen retract into the mounting frame 1, leaving space for the group A spliced LED display screen to move, and then the moving electric cylinder 33 is started to make the moving push piece 34 push the two rows of group A spliced LED display screens to move to a position where half of the group A spliced LED display screen covers half of the group B spliced LED display screen, and at the same time, the group B spliced LED display screen is closed, and then the control electric cylinder 41 is started, and the output end of the control electric cylinder 41 extends to drive the glass cover 43 located on the connecting rod 42 to cover the group A spliced LED display screen, and the light of the group A spliced LED display screen is enhanced and diffused by the glass cover 43, and finally the projection motor is started to rotate the rotating shaft 50, so that the retracted rear projection screen 51 gradually extends to block the group A spliced LED display screen and the glass cover 43, so that the diffused light of the group A spliced LED display screen is irradiated on the rear projection screen 51, so that the rear projection screen 51 displays the content played by the group A spliced LED display screen.
[0043] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An energy-saving device for splicing LED display screens, characterized in that: The invention comprises a mounting frame (1), a mounting plate (10) mounted inside the mounting frame (1), a group A spliced LED display screen mounted on the mounting plate (10), and a group B spliced LED display screen mounted on the mounting plate (10); the mounting plate (10) is provided with a driving component (2) for controlling the extension and retraction of the group B spliced LED display screen; the mounting plate (10) is provided with a driving structure (3) for moving the group A spliced LED display screen; the group A spliced LED display screen and the group B spliced LED display screen are both provided with two columns, and the two columns of the group B spliced LED display screens are arranged on both sides of the group A spliced LED display screen.
2. According to claim 1, an energy-saving device for splicing LED display screens, characterized in that: The driving assembly (2) comprises a driving electric cylinder (20) mounted on a mounting plate (10) and a telescopic mounting plate (21) fixedly connected to an output end of the driving electric cylinder (20); the group B spliced LED display screens are mounted on the telescopic mounting plate (21); and the number and position of the driving assembly (2) correspond to the group B spliced LED display screens.
3. According to the energy-saving device for splicing LED display screens as claimed in claim 1, it is characterized in that: The driving structure (3) comprises a fixed block (30) mounted on the mounting plate (10), a moving block (31) arranged on the surface of the fixed block (30) and extending outward from the mounting frame (1), a sliding groove provided on the moving block (31), and a moving mounting plate (32) slidably connected to the moving block (31) via the sliding groove, the group A spliced LED display screen being mounted on the moving mounting plate (32), the driving structure (3) further comprising two moving electric cylinders (33) arranged opposite to each other at the upper end of the interior of the mounting frame (1), a moving push piece (34) fixedly connected to the side wall of the moving mounting plate (32) and used for pushing the moving mounting plate (32) to move being fixedly provided on the output end of the moving electric cylinder (33), and the number and position of the driving structure (3) correspond to the group A spliced LED display screen.
4. The energy-saving device for splicing LED display screens according to claim 1, characterized in that: The installation frame (1) is provided with storage grooves (11) on the left and right sides thereof, and a diffusion device (4) for expanding the brightness of the A-group spliced LED display screen is provided in the storage grooves (11).
5. The energy-saving device for splicing LED display screens according to claim 4, characterized in that: The diffusion device (4) comprises a protective shell (40) arranged on the left and right sides of the outside of the installation frame (1), a control electric cylinder (41) arranged inside the protective shell (40) and having an output end extending into the storage groove (11), a connecting rod (42) fixedly connected to the output end of the control electric cylinder (41), flanges arranged on the connecting rod (42) and having a number and position corresponding to a row of group A spliced LED display screens, and a glass cover (43) fixedly connected to the flanges for amplifying the brightness of group A spliced LED display screens.
6. The energy-saving device for splicing LED display screens according to claim 1, characterized in that: A projection structure (5) for improving the visual experience of the spliced LED display screen is provided at the upper end of the interior of the installation frame (1).
7. The energy-saving device for splicing LED display screens according to claim 6, characterized in that: The projection structure (5) comprises a projection motor inside a mounting frame (1), a rotating shaft (50) fixedly connected to the output end of the projection motor, and a rear projection screen (51) rolled up on the rotating shaft (50), one end of the rear projection screen (51) is fixedly connected to the rotating shaft (50), one end of the rotating shaft (50) away from the projection motor is rotatably connected to the mounting frame (1), and the rotating shaft (50) is horizontally placed at the upper end inside the mounting frame (1).
8. The energy-saving device for splicing LED display screens according to claim 7, characterized in that: One end of the rear projection screen (51) away from the rotating shaft (50) is fixedly connected to a sinker (52).
9. The energy-saving device for splicing LED display screens according to claim 5, characterized in that: The protective shell (40) is arranged at the lower end of the installation frame (1) and the bottom surface is flush with the bottom surface of the installation frame (1).
10. An energy-saving method for an energy-saving device for splicing LED display screens as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, when the light is dark, the driving electric cylinder (20) is started to retract the telescopic mounting plate (21) with the group B spliced LED display screen into the interior of the mounting frame (1), leaving space for the group A spliced LED display screen to move; S2, starting the moving electric cylinder (33) so that the moving push piece (34) pushes the two rows of the spliced LED display screens of group A to move to a position where half of the spliced LED display screens of group A cover half of the spliced LED display screens of group B, and at the same time closing the spliced LED display screens of group B; S3, starting the control electric cylinder (41), the output end of the control electric cylinder (41) extends to drive the glass cover (43) located on the connecting rod (42), and covers the group A spliced LED display screen, and the light of the group A spliced LED display screen is enhanced and diffused through the glass cover (43); S4, starting the projection motor to rotate the rotating shaft (50), so that the rolled-up rear projection screen (51) gradually extends to block the group A spliced LED display screen and the glass cover (43), so that the diffused light of the group A spliced LED display screen is irradiated on the rear projection screen (51), so that the rear projection screen (51) displays the content played by the group A spliced LED display screen.