Display screen angle adjustment support

Abstract

The utility model discloses a display screen angle adjusting support, include: connecting frame, positioning frame, angle adjusting mechanism and angle indicating piece, positioning frame rotatable connection in connecting frame, positioning frame still can hold display screen with releasable mode, angle adjusting mechanism is used for making positioning frame rotate, and the included angle between positioning frame and connecting frame will change along with when positioning frame rotates, angle indicating piece includes indicating scale and pointer, indicating scale sets up on one of positioning frame and connecting frame, and the pointer sets up on the other of positioning frame and connecting frame, and positioning frame rotates and is suitable for making the relative rotation between pointer and indicating scale, and the rotation axis between pointer and indicating scale parallels or coincides with the rotation axis between positioning frame and connecting frame. The utility model discloses display screen angle adjusting support, and it can solve the problem of low operating efficiency and insufficient angle adjusting precision of artificial in the display screen brightness correction process.

Description

Technical Field

[0001] This utility model relates to the field of display screen bracket technology, and in particular to a display screen angle adjustment bracket. Background Technology

[0002] LED displays are high-tech products integrating optoelectronics, microelectronics, computer technology, and video technology. Their light-emitting components are assembled from LEDs (light-emitting diodes). Their advantages include low power consumption, high brightness, low operating voltage, simple driving, long lifespan, and stable performance. LED displays offer perfect multimedia effects and powerful visual impact, displaying information, text, images, animations, and videos in various ways. They have become a revolutionary product for information dissemination and are widely used in railways, civil aviation, large shopping malls, banks, securities markets, and various monitoring and dispatching systems.

[0003] Currently, the industry generally uses CCD imaging-based luminance and chromaticity correction systems to correct the luminance and chromaticity of LED displays. The equipment mainly includes an imaging luminance meter, a standard color chart, and a data processing workstation. The standard operating procedure is as follows: First, the LED display is horizontally fixed on the measurement platform. Full-screen luminance / chromaticity data is acquired using a CCD camera. A correction coefficient matrix is ​​generated using specialized software and written into the control system. During the correction process, the LED display needs to be tilted at a certain angle. Adjusting the angle of the LED display is a crucial step in luminance and chromaticity correction, and its necessity stems from optical characteristics; that is, when the viewing angle deviates from the screen's normal direction, L... The luminous intensity and chromaticity of LEDs change significantly. To ensure consistent display across multiple viewing angles, it is necessary to collect luminance and chromaticity data from different angles by tilting the screen to generate a global compensation coefficient. However, existing LED display brackets cannot effectively adjust the angle of the LED display. Each angle adjustment requires first loosening the hinge locking bolts of the LED display bracket, manually pushing the LED display to the target tilt angle, visually aligning it with the scale marks, and then tightening the bolts step by step. Finally, a laser level is used to verify the actual angle. This method relies on manual positioning, which suffers from angle rebound and low efficiency, greatly increasing the time required for a single full-view calibration. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a display screen angle adjustment bracket, which can solve the problems of insufficient accuracy and low operation efficiency of manual angle adjustment during the brightness and color correction process of the display screen.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A display screen angle adjustment bracket, comprising:

[0007] Connecting frame, positioning frame, angle adjustment mechanism, and angle indicator;

[0008] The positioning frame is rotatably connected to the connecting frame; the positioning frame can also releasably clamp the display screen.

[0009] The angle adjustment mechanism is used to rotate the positioning frame, and when the positioning frame rotates, the included angle between the positioning frame and the connecting frame will change accordingly.

[0010] The angle indicator includes an indicator scale and a pointer. The indicator scale is disposed on one of the positioning frame and the connecting frame, and the pointer is disposed on the other of the positioning frame and the connecting frame. When the positioning frame rotates, it is adapted to cause relative rotation between the pointer and the indicator scale. The axis of rotation between the pointer and the indicator scale is parallel to or coincides with the axis of rotation between the positioning frame and the connecting frame.

[0011] Furthermore, a pivot is provided at the bottom of the connecting frame, and the bottom of the positioning frame is fixedly connected to the pivot. One end of the pivot protrudes from the connecting frame, and the pointer is provided at the protruding end. The indicated scale is set on the connecting frame and is distributed in an arc shape. The axis of the pivot passes through the center of the indicated scale.

[0012] Furthermore, the angle adjustment mechanism includes a guide rail, a sliding sleeve, a connecting arm, a drive structure, and a locking structure. The guide rail is disposed on the connecting frame and is perpendicular to the rotation axis between the positioning frame and the connecting frame. The sliding sleeve is slidably connected to the guide rail. The drive structure is used to drive the sliding sleeve to move along the guide rail. The locking structure is used to lock the position of the sliding sleeve on the guide rail. One end of the connecting arm is hinged to the sliding sleeve, and the other end of the connecting arm is hinged to the positioning frame.

[0013] Furthermore, the drive structure includes a lead screw and a handwheel. The lead screw is parallel to the guide rail and rotatably mounted on the connecting frame. The lead screw is threadedly connected to the sliding sleeve. The handwheel is located outside the connecting frame and coaxially connected to the lead screw.

[0014] Furthermore, the locking structure includes a locking gear, a stop block, a locking tooth block, a pull rod, and a first spring disposed outside the connecting frame. The locking gear is coaxially connected to the lead screw, the stop block is connected to the connecting frame, the pull rod passes through the stop block and is connected to the locking tooth block, and the first spring is sleeved on the pull rod and located between the stop block and the locking tooth block. The first spring is used to provide a force to the locking tooth block toward the locking gear so that the locking tooth block meshes with the locking gear.

[0015] Furthermore, a clamping structure is provided within the positioning frame. The clamping structure includes two elastic components and two opposing clamping plates. When the two clamping plates move away from each other, the two elastic components are adapted to provide a force that brings the two clamping plates closer together.

[0016] Furthermore, the elastic component includes a guide rod, which is arranged parallel to the clamping plate. Two movable sleeves are fitted on the guide rod, and a second spring is respectively provided between the two movable sleeves and the two ends of the guide rod. A linkage rod is also hinged to each movable sleeve, and the linkage rod is also hinged to the corresponding clamping plate.

[0017] Furthermore, a support plate is provided at the bottom of both clamping plates, and / or a buffer pad is provided on the opposite surfaces of the two clamping plates, and / or a heat dissipation groove and heat dissipation holes are provided on the connecting frame.

[0018] Furthermore, the display screen angle adjustment bracket also includes a fixed base and a rotation drive mechanism, a turntable, and an angle measuring device disposed on the fixed base. The rotation drive mechanism is used to drive the turntable to rotate, the turntable is fixedly connected to the connecting frame, and the angle measuring device is used to measure the rotation angle of the turntable.

[0019] Furthermore, the rotary drive mechanism includes a motor, a drive wheel, a driven wheel, and a transmission belt connecting the drive wheel and the driven wheel. The drive shaft of the motor is connected to the drive wheel, and a transmission shaft is provided on the driven wheel. The transmission shaft is connected to the turntable. The angle measuring device includes an indexing plate and a photoelectric sensor. The indexing plate is connected to the drive shaft, and the photoelectric sensor is used to measure the rotation angle of the indexing plate.

[0020] Compared to existing technologies, the advantages of this invention are as follows: the angle adjustment mechanism allows the positioning frame to rotate, thereby changing the angle between the positioning frame and the connecting frame, thus meeting the angle adjustment requirements during the display screen calibration process, making operation very convenient. Furthermore, because an angle indicator is provided, workers can accurately read the real-time angle of the display screen, facilitating the adjustment of the display screen to the target tilt angle to meet calibration requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the interaction between the utility model display screen angle adjustment bracket and the display screen;

[0022] Figure 2 for Figure 1 Exploded view;

[0023] Figure 3 for Figure 2 A schematic diagram showing the interaction between the connecting frame and the angle adjustment mechanism;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0026] Figure 6 for Figure 1 A schematic diagram showing the interaction between the positioning frame and the clamping structure;

[0027] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0028] Figure 8 for Figure 1 A schematic diagram showing the fit between the fixed base and the turntable;

[0029] Figure 9 for Figure 8 A sectional view;

[0030] Figure 10 for Figure 9 Enlarged view of point D in the middle.

[0031] In the diagram: 1. Connecting frame; 11. Rotating shaft; 2. Positioning frame; 21. Elastic component; 211. Guide rod; 212. Moving sleeve; 213. Second spring; 214. Linkage rod; 22. Clamping plate; 23. Support plate; 24. Buffer pad; 25. Heat dissipation groove; 26. Heat dissipation hole; 3. Angle adjustment mechanism; 31. Guide rail; 32. Sliding sleeve; 33. Connecting arm; 34. Drive structure; 341. Lead screw; 342. Handwheel; 35. Locking structure; 351. Locking gear; 352. Stop; 353. Locking tooth block; 354. Pull rod; 355. First spring; 41. Pointer; 42. Indicating scale; 5. Fixing base; 61. Motor; 62. Drive wheel; 63. Driven wheel; 64. Transmission belt; 65. Drive shaft; 66. Transmission shaft; 7. Turntable; 8. Angle measuring device; 81. Indexing plate; 82. Photoelectric sensor; 9. Display screen. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Reference Figure 1-5 As shown, a display screen angle adjustment bracket includes a connecting frame 1, a positioning frame 2, an angle adjustment mechanism 3, and an angle indicator. The positioning frame 2 is rotatably connected to the connecting frame 1. The positioning frame 2 can also releasably clamp the display screen 9. The angle adjustment mechanism 3 is used to rotate the positioning frame 2, and when the positioning frame 2 rotates, the included angle between the positioning frame 2 and the connecting frame 1 will change accordingly. The angle indicator includes an indicator scale 42 and a pointer 41. The indicator scale 42 is set on one of the positioning frame 2 and the connecting frame 1, and the pointer 41 is set on the other of the positioning frame 2 and the connecting frame 1. When the positioning frame 2 rotates, it is suitable to cause relative rotation between the pointer 41 and the indicator scale 42. The rotation axis between the pointer 41 and the indicator scale 42 is parallel to or coincides with the rotation axis between the positioning frame 2 and the connecting frame 1.

[0036] The indicator scale 42 is set on one of the positioning frame 2 and the connecting frame 1, and the pointer 41 is set on the other of the positioning frame 2 and the connecting frame 1. It should be understood that there are two possible settings: First, the indicator scale 42 is set on the positioning frame 2 and the pointer 41 is set on the connecting frame 1; Second, the indicator scale 42 is set on the connecting frame 1 and the pointer 41 is set on the positioning frame 2.

[0037] In order for the pointer 41 and the indicating scale 42 to coordinate with the rotation angle of the positioning frame 2, the rotation axis between the pointer 41 and the indicating scale 42 needs to be parallel or coincident with the rotation axis between the positioning frame 2 and the connecting frame 1. It should be noted that the parallelism or coincidence here does not require absolute parallelism or coincidence, but allows for a certain degree of error, such as errors caused by limitations in machining accuracy.

[0038] In actual use, the calibrated display screen 9 is first clamped and fixed by the positioning frame 2. At this time, the display screen 9 should be almost parallel to the positioning frame 2, that is, the display screen 9 should be almost in contact with the positioning frame 2. Then, the positioning frame 2 is rotated by the angle adjustment mechanism 3, thereby changing the angle between the positioning frame 2 and the connecting frame 1, thus meeting the angle adjustment requirements of the display screen 9 during the calibration process. In the above process, because an angle indicator is provided, the worker can accurately read the real-time angle of the display screen 9, which makes it convenient to adjust the display screen 9 to the target tilt angle to meet the calibration requirements.

[0039] In some implementations, refer to Figure 3 A rotating shaft 11 is provided at the bottom of the connecting frame 1. The bottom of the positioning frame 2 is fixedly connected to the rotating shaft 11. One end of the rotating shaft 11 protrudes from the connecting frame 1, and a pointer 41 is provided at this protruding end. The indicated scale 42 is provided on the connecting frame 1 and is distributed in an arc shape. The axis of the rotating shaft 11 passes through the center of the indicated scale 42. That is, the positioning frame 2 can be rotatably connected to the connecting frame 1 via the rotating shaft 11. Specifically, the rotating shaft 11 is fixedly connected to the positioning frame 2. When the positioning frame 2 rotates, the rotating shaft 11 will also rotate. Since the pointer 41 is provided on the rotating shaft 11, the pointer 41 will also rotate. Thus, the pointer 41 can indicate the angle in real time in conjunction with the indicated scale 42.

[0040] In some implementations, refer to Figure 2-3 as well as Figure 5 The angle adjustment mechanism 3 includes a guide rail 31, a sliding sleeve 32, a connecting arm 33, a drive structure 34, and a locking structure 35. The guide rail 31 is mounted on the connecting frame 1 and is perpendicular to the rotation axis between the positioning frame 2 and the connecting frame 1. The sliding sleeve 32 is slidably connected to the guide rail 31. The drive structure 34 drives the sliding sleeve 32 to move along the guide rail 31. The locking structure 35 locks the position of the sliding sleeve 32 on the guide rail 31. One end of the connecting arm 33 is hinged to the sliding sleeve 32, and the other end is hinged to the positioning frame 2. Specifically, the drive structure 34 includes a lead screw 341 and a handwheel 342. The lead screw 341 is parallel to the guide rail 31 and rotatably mounted on the connecting frame 1. The lead screw 341 is threadedly connected to the sliding sleeve 32. The handwheel 342 is located outside the connecting frame 1 and coaxially connected to the lead screw 341. The locking structure 35 includes a locking gear 351, a stop block 352, a locking tooth block 353, a pull rod 354, and a first spring 355 disposed outside the connecting frame 1. The locking gear 351 is coaxially connected to the lead screw 341. The stop block 352 is connected to the connecting frame 1. The pull rod 354 passes through the stop block 352 and is connected to the locking tooth block 353. The first spring 355 is sleeved on the pull rod 354 and located between the stop block 352 and the locking tooth block 353. The first spring 355 is used to provide a force to the locking tooth block 353 toward the locking gear 351 so that the locking tooth block 353 meshes with the locking gear 351.

[0041] The angle adjustment mechanism 3 is used as follows: When it is necessary to adjust the angle of the positioning frame 2, first pull the lever 354 to separate the locking block 353 from the locking gear 351, then turn the handwheel 342 to drive the lead screw 341 to rotate, thereby driving the sliding sleeve 32 to move up and down. The sliding connection between the sliding sleeve 32 and the guide rail 31 ensures the reliability of the sliding sleeve 32 during its up and down movement. When the sliding sleeve 32 moves up and down, one end of the connecting arm 33, which is hinged to it, will also move up and down accordingly. The two ends of the connecting arm 33 are respectively connected to the sliding sleeve 32 and the guide rail 31. The positioning frame 2 is hinged, and its bottom is rotatably connected to the connecting frame 1. Therefore, the up-and-down movement of the sliding sleeve 32 will cause the positioning frame 2 to rotate around the rotation axis of the positioning frame 2 and the connecting frame 1, thereby achieving the angle adjustment of the positioning frame 2. After the angle adjustment is completed, the pull rod 354 is released, and the locking tooth block 353 will re-engage with the locking gear 351 under the elastic force of the first spring 355. At this time, the lead screw 341 will not be able to rotate, thereby locking the position of the sliding sleeve 32 on the guide rail 31, that is, locking the positioning frame 2 and preventing it from rotating arbitrarily.

[0042] In some implementations, refer to Figure 6-7 The positioning frame 2 is equipped with a clamping structure, which includes two elastic components 21 and two opposing clamping plates 22. When the two clamping plates 22 move away from each other, the two elastic components 21 are adapted to provide a force that brings the two clamping plates 22 closer together. The clamping structure can be used to clamp and fix or release the display screen 9.

[0043] In some implementations, reference continues. Figure 6-7 The elastic component 21 includes a guide rod 211, which is parallel to the clamping plate 22. Two movable sleeves 212 are fitted on the guide rod 211. A second spring 213 is respectively provided between the two movable sleeves 212 and the two ends of the guide rod 211. A linkage rod 214 is also hinged to each movable sleeve 212, and the linkage rod 214 is also hinged to the corresponding clamping plate 22. Its working principle is as follows: When it is necessary to clamp the display screen 9 in the positioning frame 2, the two clamping plates 22 can be moved in opposite directions. At this time, the movable sleeve 212 near the upper end of the guide rod 211 will move upward, while the movable sleeve 212 near the lower end of the guide rod 211 will move downward, and the second spring 213 will also be compressed. When the distance between the two clamping plates 22 meets the requirements of the display screen 9, the two clamping plates 22 can be released. The two clamping plates 22 will move closer to each other under the action of the second spring 213, thereby clamping the display screen 9.

[0044] In some embodiments, a support plate 23 is provided at the bottom of both clamping plates 22. By providing the support plate, the display screen 9 can be supported, making the display screen 9 more reliably fixed on the positioning frame 2.

[0045] In some embodiments, buffer pads 24 are provided on the opposing surfaces of the two clamping plates 22. By providing buffer pads 24, damage to the display screen 9 during the calibration process can be reduced.

[0046] In some embodiments, the connecting frame 1 is provided with heat dissipation grooves 25 and heat dissipation holes 26. By providing heat dissipation grooves 25 and heat dissipation holes 26, the display screen 9 can have better heat dissipation conditions during the calibration process, avoiding damage to the display screen 9 due to high temperature.

[0047] In some implementations, refer to Figure 8-10 The display screen angle adjustment bracket also includes a fixed base 5 and a rotary drive mechanism, a turntable 7, and an angle measuring device 8 mounted on the fixed base 5. The rotary drive mechanism drives the turntable 7 to rotate. The rotation axis of the turntable 7 is perpendicular to the plane where the connecting frame 1 is located. The turntable 7 is fixedly connected to the connecting frame 1. The angle measuring device 8 is used to measure the rotation angle of the turntable 7. Specifically, the rotary drive mechanism includes a motor 61, a drive wheel 62, a driven wheel 63, and a transmission belt 64 connecting the drive wheel 62 and the driven wheel 63. The drive shaft 65 of the motor 61 is connected to the drive wheel 62. A transmission shaft 66 is provided on the driven wheel 63 and is connected to the turntable 7. The angle measuring device 8 includes an indexing plate 81 and a photoelectric sensor 82. The indexing plate 81 is connected to the drive shaft 65, and the photoelectric sensor 82 is used to measure the rotation angle of the indexing plate 81.

[0048] In the above configuration, the rotation axis of turntable 7 is perpendicular to the plane of connecting frame 1. Therefore, the rotation mechanism can meet the multi-angle correction requirements of display screen 9 in the horizontal direction, further improving the brightness and color correction effect of display screen 9. Furthermore, when the rotation drive mechanism drives turntable 7 to rotate, angle measuring device 8 can also record the rotation angle of turntable 7 in real time, facilitating recording by workers.

[0049] Specifically, when the display screen 9 is being calibrated, the start motor 61 drives the drive wheel 62 to rotate via the drive shaft 65 of the motor 61, and transmits the power to the driven wheel 63 via the transmission belt 64, thereby driving the turntable 7 to rotate. At this time, the indexing plate 81 rotates synchronously with the drive shaft 65 of the motor 61, and the photoelectric sensor 82 detects the scale marks on the indexing plate 81 in real time and feeds the position signal back to the external control system to achieve precise angle positioning of the turntable 7.

[0050] The method of using the display screen angle adjustment bracket of this utility model is as follows:

[0051] S1. Fix the mounting base 5 to the table surface with anchor bolts, then connect the connecting frame 1 to the turntable 7 with bolts, and then clamp the display screen 9 to be calibrated in the positioning frame 2.

[0052] S2. Rotate the handwheel 342 to make the sliding sleeve 32 move along the guide rail 31 under the action of the lead screw 341. At this time, the connecting arm 33 pushes the positioning frame 2 to rotate around the rotation axis of the positioning frame 2 and the connecting frame 1. The real-time angle is confirmed by the cooperation of the pointer 41 and the indicator scale 42.

[0053] S3. Place the standard color card in front of the main body of the display screen 9 as the reference, use a CCD imaging luminance meter to collect the brightness and color data of the whole screen, and record the brightness non-uniformity and color coordinate deviation at each angle.

[0054] S4. Start motor 61 to drive turntable 7 to rotate. At this time, indexing plate 81 also rotates synchronously with drive shaft 65 of motor 61. Photoelectric sensor 82 detects the scale marks on indexing plate 81 in real time and feeds back the position signal to external control system to achieve precise angle positioning of turntable 7 and meet the multi-angle correction requirements of the main body of display screen 9 in the horizontal direction.

[0055] S5. Import the collected luminance and chromaticity data into an external workstation to generate a matrix that includes horizontal / vertical viewing angle compensation coefficients and luminance attenuation compensation. Write the compensation matrix into the control system of the display screen 9 to cover all preset angle parameters, thereby completing the luminance and chromaticity correction of the display screen 9.

[0056] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A display screen angle adjustment bracket, characterized in that, include: Connecting frame, positioning frame, angle adjustment mechanism, and angle indicator; The positioning frame is rotatably connected to the connecting frame; The positioning frame can also hold the display screen in a releasable manner; The angle adjustment mechanism is used to rotate the positioning frame, and when the positioning frame rotates, the included angle between the positioning frame and the connecting frame will change accordingly. The angle indicator includes an indicator scale and a pointer. The indicator scale is disposed on one of the positioning frame and the connecting frame, and the pointer is disposed on the other of the positioning frame and the connecting frame. When the positioning frame rotates, it is adapted to cause relative rotation between the pointer and the indicator scale. The axis of rotation between the pointer and the indicator scale is parallel to or coincides with the axis of rotation between the positioning frame and the connecting frame.

2. The display screen angle adjustment bracket as described in claim 1, characterized in that: A pivot is provided at the bottom of the connecting frame, and the bottom of the positioning frame is fixedly connected to the pivot. One end of the pivot protrudes from the connecting frame, and the pointer is provided at the protruding end. The indicated scale is set on the connecting frame and is distributed in an arc shape. The axis of the pivot passes through the center of the indicated scale.

3. The display screen angle adjustment bracket as described in claim 1, characterized in that: The angle adjustment mechanism includes a guide rail, a sliding sleeve, a connecting arm, a drive structure, and a locking structure. The guide rail is disposed on the connecting frame and is perpendicular to the rotation axis between the positioning frame and the connecting frame. The sliding sleeve is slidably connected to the guide rail. The drive structure is used to drive the sliding sleeve to move along the guide rail. The locking structure is used to lock the position of the sliding sleeve on the guide rail. One end of the connecting arm is hinged to the sliding sleeve, and the other end of the connecting arm is hinged to the positioning frame.

4. The display screen angle adjustment bracket as described in claim 3, characterized in that: The drive structure includes a lead screw and a handwheel. The lead screw is parallel to the guide rail and rotatably mounted on the connecting frame. The lead screw is threadedly connected to the sliding sleeve. The handwheel is located outside the connecting frame and coaxially connected to the lead screw.

5. The display screen angle adjustment bracket as described in claim 4, characterized in that: The locking structure includes a locking gear, a stop block, a locking tooth block, a pull rod, and a first spring disposed outside the connecting frame. The locking gear is coaxially connected to the lead screw, the stop block is connected to the connecting frame, the pull rod passes through the stop block and is connected to the locking tooth block, and the first spring is sleeved on the pull rod and located between the stop block and the locking tooth block. The first spring is used to provide a force to the locking tooth block toward the locking gear so that the locking tooth block meshes with the locking gear.

6. The display screen angle adjustment bracket as described in claim 1, characterized in that: The positioning frame is provided with a clamping structure, which includes two elastic components and two opposing clamping plates. When the two clamping plates move away from each other, the two elastic components are adapted to provide a force that brings the two clamping plates closer together.

7. The display screen angle adjustment bracket as described in claim 6, characterized in that: The elastic component includes a guide rod, which is arranged parallel to the clamping plate. Two movable sleeves are fitted on the guide rod, and a second spring is respectively provided between the two movable sleeves and the two ends of the guide rod. A linkage rod is also hinged to each movable sleeve, and the linkage rod is also hinged to the corresponding clamping plate.

8. The display screen angle adjustment bracket as described in claim 7, characterized in that: The bottom of both clamping plates is provided with a support plate, and / or the opposing surfaces of the two clamping plates are provided with a buffer pad, and / or the connecting frame is provided with heat dissipation grooves and heat dissipation holes.

9. The display screen angle adjustment bracket as described in any one of claims 1-8, characterized in that: The display screen angle adjustment bracket also includes a fixed base and a rotary drive mechanism, a turntable, and an angle measuring device disposed on the fixed base. The rotary drive mechanism is used to drive the turntable to rotate. The turntable is fixedly connected to the connecting frame. The angle measuring device is used to measure the rotation angle of the turntable.

10. The display screen angle adjustment bracket as described in claim 9, characterized in that: The rotary drive mechanism includes a motor, a drive wheel, a driven wheel, and a transmission belt connecting the drive wheel and the driven wheel. The drive shaft of the motor is connected to the drive wheel, and a transmission shaft is provided on the driven wheel. The transmission shaft is connected to the turntable. The angle measuring device includes an indexing plate and a photoelectric sensor. The indexing plate is connected to the drive shaft, and the photoelectric sensor is used to measure the rotation angle of the indexing plate.

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