Seamlessly spliced spherical display screen

Abstract

The invention discloses a seamlessly spliced spherical display screen, which comprises a central base frame, a synchronous driving device, a plurality of groups of telescopic frameworks and an LED display unit group, and is characterized in that the synchronous driving device is arranged in the central base frame; comprising a driving unit, a driving shaft connected with the output end of the driving unit, a plurality of driving bevel gears fixedly arranged at intervals in the axial direction of the driving shaft, driven bevel gears meshed with the driving bevel gears respectively and a ball screw pair. The multiple sets of telescopic frameworks are annularly distributed around the center base frame, and each telescopic framework comprises a connecting base fixedly connected with the tail end of a lead screw of the corresponding ball screw pair and a supporting frame supported by the connecting base and extending in the radial direction. The LED display unit group comprises a plurality of special-shaped display units, and each special-shaped display unit is detachably mounted at the tail end of the support frame; according to the technical scheme, the problem that a traditional spherical LED display screen is difficult to install and debug is solved.

Description

Technical Field

[0001] This invention relates to the field of spherical display technology, and in particular to a seamless splicing spherical display. Background Technology

[0002] Spherical LED displays, with their unique visual immersion and enveloping effect, have gained increasingly widespread application in fields such as science and technology museums, exhibitions, stage performances, and commercial advertising. However, as is well known to those skilled in the art, traditional spherical LED displays have long faced several technical bottlenecks in structural design and practical application that urgently need to be addressed.

[0003] In terms of installation and maintenance, traditional dome screens mostly adopt fixed rigid structures or modular assembly schemes. Once the display screen is finally formed, its internal space is usually extremely small or enclosed, making it difficult for technicians to access each display unit for precise positioning, complex wiring, and meticulous debugging. This not only significantly reduces installation efficiency and increases labor and time costs, but also makes it extremely easy for wiring errors or unit damage to occur due to insufficient operating space, making subsequent maintenance and replacement work exceptionally difficult. Summary of the Invention

[0004] The main objective of this invention is to provide a seamless spherical display screen, which aims to solve the problem of difficult installation and debugging of traditional spherical LED displays.

[0005] To achieve the above objectives, the present invention proposes a seamless splicing spherical display screen, comprising: The central frame is used to bear the overall load and to lay cables. A synchronous drive device, disposed within the central base frame, includes a drive unit, a drive shaft connected to the output end of the drive unit, a plurality of drive bevel gears fixedly spaced along the axial direction of the drive shaft, driven bevel gears meshing with each of the drive bevel gears, and a ball screw pair; the driven bevel gears are rotatably supported on the central base frame via a bearing structure, the nut of the ball screw pair is coaxially fixedly connected to the driven bevel gear, the screw of the ball screw pair is arranged radially along the central base frame, and the screw slides with the central base frame via a linear guide structure; Multiple sets of telescopic frames are arranged around the central base frame. Each telescopic frame includes a connecting base fixedly connected to the end of a ball screw pair, and a support frame supported by the connecting base and extending radially. The LED display unit group includes multiple irregularly shaped display units, each of which is detachably mounted on the end of the support frame; The drive unit drives each of the active bevel gears to rotate synchronously via the drive shaft, thereby driving each of the driven bevel gears and the lead screw fixed thereto to rotate synchronously, which in turn causes the nuts that cooperate with each of the lead screws to move linearly, thereby driving all the telescopic skeletons to extend and retract radially synchronously. When the telescopic frame expands radially, each of the irregularly shaped display units separates to form a working space; when the telescopic frame contracts radially, each of the irregularly shaped display units comes together to form a complete seamless spherical display surface.

[0006] In one possible implementation, the drive unit includes a servo motor and a reducer connected to the output end of the servo motor. The output shaft of the reducer is coaxially connected to the drive shaft, and the drive shaft is rotatably supported within the central frame via a bearing housing.

[0007] In one possible implementation, the irregularly shaped display unit includes: Flexible LED panels; The display unit frame is used to support and fix the flexible LED panel; and A flexible skin is used to cover the edge of the display unit skeleton.

[0008] In one possible implementation, a permanent magnet is provided on the back of the irregularly shaped display unit, and a magnetically conductive mounting base that is attracted and engaged with the permanent magnet is provided at the end of the support frame.

[0009] In one possible implementation, a limit block is provided at the end of the lead screw away from the driven bevel gear, and a limit switch that cooperates with the limit block is provided at the corresponding position of the central base frame to limit the maximum expansion stroke of the telescopic frame.

[0010] In one possible implementation, a synchronization detection device is also included, which includes displacement sensors disposed at the ends of each of the support frames and a controller communicatively connected to each of the displacement sensors. The controller is used to determine whether each of the telescopic frames moves synchronously based on the detection data of each sensor.

[0011] The technical solution of this invention adopts a central synchronous drive structure, in which a single motor drives the vertical drive shaft, and the power is synchronously transmitted to all telescopic frames through a bevel gear pair and a ball screw pair. This achieves synchronous and stable telescopic extension and retraction of the entire spherical display screen, solving the problems of limited installation and maintenance space, difficult operation, high cost, complex control, and easy desynchronization of traditional spherical screens. At the same time, the rigid-flexible composite design of irregularly shaped display units and flexible edge skin enables the physical gaps to be filled and the visual black lines to be eliminated when the display screen is in the retracted state, thereby achieving a high-quality seamless splicing display effect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 This is a partially enlarged schematic diagram of a synchronous drive device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of an irregularly shaped display unit structure according to an embodiment of the present invention; Explanation of icon numbers: 1. Central base frame; 2. Synchronous drive device; 21. Drive unit; 211. Servo motor; 212. Reducer; 22. Drive shaft; 23. Drive bevel gear; 24. Driven bevel gear; 25. Lead screw; 26. Nut; 3. Telescopic frame; 31. Connecting base; 32. Support frame; 4. Irregularly shaped display unit; 41. Flexible LED panel; 42. Display unit frame; 43. Flexible skin; 51. Permanent magnet; 52. Magnetic mounting base; 61. Limit block; 62. Limit switch.

[0014] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0016] To address the problems in the background technology, this invention proposes a seamless splicing spherical display screen, comprising: Central base frame 1 is used to bear the overall load and lay cables; The synchronous drive device 2, disposed within the central base frame 1, includes a drive unit 21, a drive shaft 22 connected to the output end of the drive unit 21, a plurality of drive bevel gears 23 fixedly spaced along the axial direction of the drive shaft 22, driven bevel gears 24 meshing with each of the drive bevel gears 23, and a ball screw pair 25. The driven bevel gears 24 are rotatably supported on the central base frame 1 by a bearing structure. The nut 26 of the ball screw pair 25 is coaxially fixedly connected to the driven bevel gears 24. The screw 25 of the ball screw pair 25 is arranged radially along the central base frame 1, and the screw 25 slides with the central base frame 1 through a linear guide structure. Multiple sets of telescopic frames 3 are arranged around the central base frame 1. Each telescopic frame 3 includes a connecting base 31 fixedly connected to the end of the lead screw 25 of a ball screw pair 25, and a support frame 32 supported by the connecting base 31 and extending radially. The LED display unit group includes multiple irregularly shaped display units 4, each of which is detachably mounted on the end of the support frame 32; The drive unit 21 drives each of the drive bevel gears 23 to rotate synchronously via the drive shaft 22, thereby driving each of the driven bevel gears 24 and the lead screw 25 fixed thereto to rotate synchronously, which in turn causes the nuts 26 that cooperate with each of the lead screws 25 to produce linear motion, thereby driving all the telescopic frames 3 to expand and contract radially synchronously. When the telescopic frame 3 expands radially, each of the irregularly shaped display units 4 separates to form a working space; when the telescopic frame 3 contracts radially, each of the irregularly shaped display units 4 comes together to form a complete seamless spherical display surface.

[0017] Combined with reference Figures 1 to 4As shown, in this embodiment, the central base frame 1 constitutes the load-bearing foundation and structural skeleton of the entire system, typically constructed from high-strength aluminum alloy profiles or welded steel pipes into a frame structure. Its interior features a well-organized cable channel for the orderly laying of power and signal lines, and reinforced structures at the top and bottom for mounting the drive unit 21 and bearing seats. The synchronous drive device 2, serving as the power and motion control hub, is compactly integrated within the central base frame 1. This device includes a drive unit 21 as a power source, preferably a combination of a servo motor 211 and a worm gear reducer 212 with a self-locking function. The output end of the reducer 212 is coaxially connected to a vertically positioned drive shaft 22 via a coupling, and the drive shaft 22 is stably supported on the central base frame 1 by two bearing seats. Preferably, multiple drive bevel gears 23 are fixed at certain intervals along the axial direction of this drive shaft 22 via key connections. Each drive bevel gear 23 precisely meshes with a driven bevel gear 24, forming a set of orthogonal bevel gear pairs. Each driven bevel gear 24 is rotatably and securely supported on the side wall of the central base frame 1 by a set of angular contact ball bearings or tapered roller bearings. In this embodiment, the hub of each driven bevel gear 24 is coaxially and fixedly connected to one end of the lead screw 25 of the ball screw pair, thereby directly transmitting rotational motion to the lead screw 25. The nut 26 of the ball screw pair serves as a power output component and is fixedly connected to the connecting base 31 of the telescopic frame 3 via a connecting sleeve. To ensure that the nut 26 does not rotate with the lead screw 25 but only produces precise axial linear motion, the connecting sleeve or nut 26 forms a sliding fit with the central base frame 1 through a linear guide structure. This linear guide structure is preferably a combination of a high-precision linear guide rail and a slider, or a combination of a guide shaft and a linear bearing. When the drive unit 21 operates, the rotation of the driven bevel gear 24 drives the lead screw 25 to rotate synchronously. Under the constraint of the linear guide structure, the nut 26 moves linearly along the rotating lead screw 25, thereby directly driving the connecting base 31 and the support frame 32 to extend and retract radially. In another embodiment, the synchronous drive device 2 adopts a center-converging transmission layout. The vertical output shaft of the drive unit 21 is connected to and drives a large-diameter active bevel gear disk located in the middle of the main shaft. Multiple driven bevel gears 24 are evenly distributed around the active bevel gear disk circumferentially and simultaneously mesh orthogonally with the active bevel gear disk. In this layout, the hub of each driven bevel gear 24 is also fixedly connected to one end of the lead screw 25 of a ball screw pair 25. Each lead screw 25 rotates accordingly, while each nut 26 is fixed to the support frame 32 through the connecting base 31 and its rotation is restricted by the linear guide structure. When the central active bevel gear disk rotates, it synchronously drives all driven bevel gears 24 and lead screws 25 to rotate, thereby forcing all nuts 26 to produce synchronous linear motion, driving all support frames 32 to achieve precise synchronous radial extension and retraction.

[0018] The telescopic frames 3 consist of multiple sets, evenly distributed in a ring around the central base frame 1, centered on its central axis. Each set of telescopic frames 3 includes a connecting base 31 and a support frame 32. The connecting base 31 is fixedly connected to the end of the corresponding set of ball screws 25 via threads or a flange. The support frame 32 is vertically fixed to the connecting base 31 and extends radially outward. In this embodiment, the support frame 32 itself is a rigid structure, and its telescopic movement is entirely driven by the linear movement of the ball screw 25. The LED display unit group constitutes the final display surface. It includes multiple precisely calculated and processed irregularly shaped display units 4, such as spherical polygons (e.g., spherical triangles, quadrilaterals, or hexagons). The housings of these irregularly shaped display units 4 are specially designed so that their outer surfaces are curved to match the target sphere, while their inner surfaces match the shape of the end of the support frame 32. Each of the irregularly shaped display units 4 is detachably fixed to the end of the corresponding support frame 32 by means of bolts or quick clamps or other mechanisms.

[0019] The working principle of this invention is as follows: When the spherical surface needs to be opened for maintenance, the drive unit 21 is activated, driving the drive shaft 22 to rotate, and all the drive bevel gears 23 fixed on it rotate synchronously. The drive bevel gears 23 drive each driven bevel gear 24 meshing with them to rotate synchronously, thereby driving the nuts 26 of all ball screw pairs 25 coaxially fixed with the driven bevel gears 24 to rotate synchronously. Under the constraint of the linear guide structure, the rotational motion of the nuts 26 is converted into the synchronous linear motion of each screw 25, and all screws 25 extend outward radially along the central base frame 1 at the same time. Since the ends of the screws 25 are fixed to the support frame 32 through the connecting base 31, all the telescopic frames 3 are driven to expand outward radially synchronously. As the support frame 32 moves radially, the irregularly shaped display units 4 fixedly installed at its ends separate from each other, forming a sufficiently large working space in the middle of the spherical surface, allowing maintenance personnel to easily enter the sphere to perform operations. When a closed spherical display is required, the drive unit 21 rotates in the opposite direction, driving all lead screws 25 to retract radially inward synchronously via the aforementioned transmission chain, causing all telescopic frames 3 and their display units to converge towards the center synchronously. When the retraction reaches the design endpoint, the edges of each irregularly shaped display unit 4 fit tightly together, and with their precise irregular curved surface structure, they are pieced together to form a complete, visually seamless spherical display surface.

[0020] In one possible implementation, the drive unit 21 includes a servo motor 211 and a reducer 212 connected to the output end of the servo motor 211. The output shaft of the reducer 212 is coaxially connected to the drive shaft 22, and the drive shaft 22 is rotatably supported in the central base frame 1 through a bearing seat.

[0021] Combined with reference Figure 3 As shown, in this embodiment, the servo motor 211 is preferably an AC servo motor 211 with an encoder, which is fixedly mounted on a dedicated motor mount inside the central base frame 1 via a flange. The output shaft of the servo motor 211 is directly connected to the input shaft of the reducer 212 via a high-rigidity coupling. The reducer 212 is preferably a worm gear reducer 212, taking advantage of its smooth transmission, low noise, and reverse self-locking characteristics. The output shaft of the reducer 212 is coaxially connected to the drive shaft 22 via a key connection to ensure the accuracy and efficiency of power transmission. To ensure the stability and concentricity of the drive shaft 22 under high-speed rotation, the drive shaft 22 is rotatably supported on the side wall or internal frame of the central base frame 1 by at least two bearing seats. Deep groove ball bearings or angular contact bearings are installed in the bearing seats to withstand radial loads and a certain axial load. The axis of the drive shaft 22 preferably coincides with the central axis of the central base frame 1.

[0022] In one possible implementation, the irregularly shaped display unit 4 includes: Flexible LED panel 41; The display unit frame 42 is used to support and fix the flexible LED panel 41; and The flexible skin 43 covers the edge of the display unit skeleton 42.

[0023] Combined with reference Figure 4 As shown, in this embodiment, the flexible LED panel 41 uses a bendable LED module based on flexible circuit board technology, which can adapt to certain curved deformations without affecting display performance. The display unit frame 42, as the main supporting structure, is precision cast from lightweight, high-strength aluminum alloy or engineering plastic. Its shape is designed as a spherical trapezoid or spherical triangle, etc., according to the target curvature of the spherical display screen. The flexible LED panel 41 is smoothly attached and fixed to the front of the display unit frame 42 using a special adhesive or snap-fit ​​structure. The flexible skin 43 uses highly elastic silicone or thermoplastic polyurethane material, and is completely wrapped around all the outer edges of the display unit frame 42 through overmolding or bonding processes, forming a flexible boundary protection layer. When the display screen shrinks and molds, the flexible skin 43 at the edges of adjacent display units can be squeezed together and tightly fitted, effectively filling the physical gaps between units and visually eliminating the black gaps that are difficult to avoid with traditional rigid splicing, thus improving the seamless display effect.

[0024] In one possible implementation, a permanent magnet 51 is provided on the back of the irregularly shaped display unit 4, and a magnetically conductive mounting base 52 that is attracted and engaged with the permanent magnet 51 is provided at the end of the support frame 32.

[0025] Combined with reference Figure 4As shown, in this embodiment, the irregularly shaped display unit 4 and the support frame 32 adopt a magnetic quick-connect structure. Specifically, multiple high-performance permanent magnets 51 are provided on the back of the irregularly shaped display unit 4, i.e., the side facing the central support frame 32. These permanent magnets 51 are preferably made of neodymium iron boron material, which has strong magnetic force and good temperature stability. They are uniformly embedded in the reserved mounting grooves on the back of the display unit frame 42 and firmly fixed with epoxy resin. Correspondingly, at the end of the support frame 32, a magnetically conductive mounting base 52 matching the array of permanent magnets 51 is provided. This mounting base is made of metal materials with excellent magnetic permeability, such as low-carbon steel. Its contact surface is precision machined, and its shape matches the contour of the back of the display unit, ensuring maximum contact area and adsorption force. The operator only needs to bring the display unit close to the magnetically conductive mounting base 52, and the strong magnetic force will automatically guide the unit to be accurately positioned and firmly adsorbed, reducing the installation time of a single unit from the traditional minutes to the seconds, greatly improving installation efficiency.

[0026] In one possible implementation, a limiting block 61 is provided at the end of the lead screw 25 away from the driven bevel gear 24, and a limit switch 62 that cooperates with the limiting block 61 is provided at the corresponding position of the central base frame 1 to limit the maximum expansion stroke of the telescopic frame 3.

[0027] Specifically, in this embodiment, a limit block 61 is fixedly installed at the end of the ball screw 25 furthest from the driven bevel gear 24. This limit block 61 is made of high-strength metal and is firmly connected to the end of the ball screw 25 via threaded connection or welding. Correspondingly, a limit switch 62 is installed at the corresponding radial position of the central support frame 32. This limit switch 62 is preferably a contact microswitch or a non-contact proximity switch, precisely fixed at the limit position of the maximum allowable stroke of the ball screw 25 by a dedicated mounting bracket. When the drive unit 21 drives the ball screw 25 to extend radially, the limit block 61 at the end of the ball screw 25 moves outward synchronously with the ball screw 25. When the telescopic frame 3 is about to reach its maximum designed expansion diameter, the limit block 61 contacts the sensing element of the limit switch 62 or enters its sensing range. At this time, the limit switch 62 immediately generates an electrical signal and transmits it to the control system. Upon receiving the signal, the control system immediately cuts off the power to the drive unit 21 or stops its operation, thereby precisely limiting the maximum expansion stroke of the telescopic frame 3 and effectively preventing damage to mechanical parts or safety accidents caused by excessive extension of the mechanism.

[0028] In one possible implementation, a synchronization detection device is also included, which includes displacement sensors disposed at the ends of each of the support frames 32 and a controller communicatively connected to each of the displacement sensors. The controller is used to determine whether each of the telescopic frames 3 moves synchronously based on the detection data of each sensor.

[0029] Combined with reference Figure 3 As shown, in this embodiment, the synchronization detection device includes displacement sensors installed at the ends of each support frame 32, and a central controller connected to all displacement sensors via fieldbus or parallel communication. The displacement sensors are preferably laser rangefinders or magnetic grating displacement sensors, with their detection direction arranged radially along the central support frame 32, used to accurately measure the radial displacement value of each support frame 32 end relative to the central support frame 32 in real time. The central controller uses a PLC or embedded industrial control system with multi-channel high-speed data acquisition capabilities, and has a pre-installed synchronization judgment algorithm program. When the drive unit 21 moves each telescopic frame 3, the displacement sensors at the ends of each support frame 32 continuously collect real-time displacement data and transmit the data to the central controller via communication lines. The synchronization judgment algorithm inside the controller continuously compares the displacement data of each channel and calculates the displacement deviation between each support frame 32. When the deviation of the displacement value of any channel from the reference value exceeds a preset threshold, the controller can adopt various processing strategies: immediately issue a stop command to the drive unit 21 to prevent further desynchronization; or fine-tune the output of the drive unit 21; and simultaneously trigger an audible and visual alarm device to alert the operator.

[0030] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A seamlessly spliced ​​spherical display screen, characterized in that, include: The central frame is used to bear the overall load and to lay cables. A synchronous drive device, disposed within the central base frame, includes a drive unit, a drive shaft connected to the output end of the drive unit, a plurality of drive bevel gears fixedly spaced along the axial direction of the drive shaft, driven bevel gears meshing with each of the drive bevel gears, and a ball screw pair; the driven bevel gears are rotatably supported on the central base frame via a bearing structure, the nut of the ball screw pair is coaxially fixedly connected to the driven bevel gear, the screw of the ball screw pair is arranged radially along the central base frame, and the screw slides with the central base frame via a linear guide structure; Multiple sets of telescopic frames are arranged around the central base frame. Each telescopic frame includes a connecting base fixedly connected to the end of a ball screw pair, and a support frame supported by the connecting base and extending radially. The LED display unit group includes multiple irregularly shaped display units, each of which is detachably mounted on the end of the support frame; The drive unit drives each of the active bevel gears to rotate synchronously via the drive shaft, thereby driving each of the driven bevel gears and the lead screw fixed thereto to rotate synchronously, which in turn causes the nuts that cooperate with each of the lead screws to move linearly, thereby driving all the telescopic skeletons to extend and retract radially synchronously. When the telescopic frame expands radially, each of the irregularly shaped display units separates to form a working space; when the telescopic frame contracts radially, each of the irregularly shaped display units comes together to form a complete seamless spherical display surface.

2. The seamless splicing spherical display screen according to claim 1, characterized in that, The drive unit includes a servo motor and a reducer connected to the output end of the servo motor. The output shaft of the reducer is coaxially connected to the drive shaft, and the drive shaft is rotatably supported in the central frame through a bearing seat.

3. The seamless splicing spherical display screen according to claim 1, characterized in that, The irregularly shaped display unit includes: Flexible LED panels; The display unit frame is used to support and fix the flexible LED panel; and A flexible skin is used to cover the edge of the display unit skeleton.

4. The seamless splicing spherical display screen according to claim 3, characterized in that, The back of the irregularly shaped display unit is provided with a permanent magnet, and the end of the support frame is provided with a magnetically conductive mounting base that is attracted and engaged with the permanent magnet.

5. The seamless splicing spherical display screen according to claim 1, characterized in that, A limit block is provided at the end of the lead screw away from the driven bevel gear, and a limit switch that cooperates with the limit block is provided at the corresponding position of the central base frame to limit the maximum expansion stroke of the telescopic frame.

6. The seamless splicing spherical display screen according to claim 1, characterized in that, It also includes a synchronous detection device, which includes a displacement sensor disposed at the end of each of the support frames and a controller communicatively connected to each of the displacement sensors. The controller is used to determine whether each of the telescopic frames moves synchronously based on the detection data of each sensor.

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