CN215868488U - Positioning device and display screen - Google Patents

Abstract

The utility model relates to a positioning device and a display screen, which are used for connecting a box body of a display module. The positioning device comprises a gap positioning component and an angle positioning component. The gap positioning assembly comprises 2 simulation plates which are rotatably connected, wherein the 2 simulation plates are detachably connected to the 2 boxes to be spliced and used for simulating the splicing state of the display panels of the display modules, the 2 simulation plates are rotatably connected, the first binding surfaces of the 2 simulation plates are respectively bound with the front end surfaces of the boxes to be spliced, and the side walls of the 2 boxes to be spliced are respectively flush with the side surfaces of the 2 simulation plates; the angle locating component comprises a connecting block, the connecting block comprises 2 second binding faces which are preset in angle setting, and the rear end face of the box body is attached to the second binding faces. The positioning device provided by the utility model can avoid the installation interference of the connecting modules, and simultaneously ensures the precision of the angle and the clearance between the box bodies.

Description

Positioning device and display screen

Technical Field

The utility model relates to the technical field of display screens, in particular to a positioning device and a display screen.

Background

The LED display screen has the advantages of bright color, wide dynamic range, high brightness, long service life, stable and reliable work and the like, is widely applied in life, along with the popularization of the LED display screen, more and more users put forward higher requirements on the display effect of the lED display screen, the display screen has better visual effect compared with a linear screen, the picture of the display screen cannot be deformed when the display screen is watched from different angles, and the LED display screen is more popular in the market.

Large-scale LED display screen contains the multiunit can splice in LED display module assembly of an organic whole usually, and display module assembly divide into display panel and box usually, for avoiding installation damage display panel, splices a plurality of boxes to suitable position earlier usually, installs display panel again one by one. The angle is 0 degree between the lateral wall of the box of conventional LED display screen and box, and the screen body is the linear type promptly, and the display effect after the display module assembly concatenation depends on the concatenation gap of module display surface, when the screen body need be done the inner arc display effect, when the screen body radian is different, the angle in the clearance between the box side wall will be different, consequently hardly when the installation display module assembly when guaranteeing display module assembly lateral wall angle precision guarantee the precision in the positive clearance of display module assembly.

SUMMERY OF THE UTILITY MODEL

Therefore, a positioning device is needed to solve the problem that the accuracy of the sidewall angle and the front gap of the LED display module of the display screen is difficult to be ensured.

The utility model provides a positioning device, which is used for connecting a box body of a display module, wherein the box body is used for installing a display panel of the display module, and the positioning device comprises:

the gap positioning assembly comprises 2 simulation plates, each simulation plate comprises a first binding surface and a side surface adjacent to the first binding surface, the 2 simulation plates are detachably connected to the 2 boxes to be spliced and are used for simulating the splicing state of the display panels of the 2 display modules, the 2 simulation plates are rotatably connected by taking the splicing edges of the two at the sides far away from the boxes as rotating axes, the first binding surfaces of the 2 simulation plates are respectively bound with the front end surfaces of the boxes to be spliced, and the side walls, used for splicing, of the 2 boxes to be spliced are respectively flush with the side surfaces of the 2 simulation plates;

the angle positioning assembly comprises a connecting block, the connecting block comprises 2 second binding faces which are preset in angle setting, and the box body is connected to the connecting block in a laminating mode.

In one embodiment, the simulation board is provided with a positioning pin, the positioning pin is arranged on the first attaching surface, and the case body is provided with a positioning hole, and the positioning pin is inserted into the positioning hole when the first attaching surface is attached to the front end surface.

In one embodiment, the positioning pin on at least one of the above-mentioned dummy plates is a telescopic positioning pin, when the telescopic positioning pin is in the extended position, the telescopic positioning pin is inserted into the positioning hole, and when the telescopic positioning pin is in the retracted position, the end surface of the telescopic positioning pin is not higher than the first abutting surface.

In one embodiment, the telescopic positioning pin is in threaded connection with the simulation plate.

In one embodiment, the clearance positioning assembly comprises an elastic member, and when the elastic member is in a free state, the telescopic positioning pin is abutted against the extending position.

In one embodiment, the box body is provided with a magnet, the end face of the magnet, which is far away from the box body, is not higher than the front end face, the simulation board is made of a magnetic metal material, and when the simulation board is arranged on the box body, the simulation board is adsorbed by the magnet, and the first attaching face is attached to the front end face.

In one embodiment, the box body is provided with a magnet, the end face of the magnet, which is far away from the box body, is not higher than the front end face, the simulation plate is made of a non-magnetic material, and an iron sheet is embedded in the simulation plate and used for being adsorbed by the magnet to attach the first attaching face to the front end face.

In one embodiment, the angle positioning component comprises a bolt, the bolt comprises a nut and a threaded section, the box body comprises a connecting hole, the connecting block comprises a threaded hole, and the threaded section penetrates through the connecting hole and is matched with the threaded hole to lock the box body and the connecting block.

In one embodiment, the simulation plate is provided with a through hole, and the bolt penetrates through the through hole to lock the box body and the connecting block.

In one embodiment, the 2 dummy plates are pivotally connected by a hinge.

In one embodiment, the preset angle between the 2 second abutting surfaces ranges from 150 degrees to 180 degrees.

In another aspect, the present invention provides a display screen, including the above positioning device.

Above-mentioned positioner connects the box of display module assembly in order to predetermine the angle through clearance locating component and angle locating component, has guaranteed the precision of angle between the box, has planned the mounted position when display panel installs on the box through the emulation board, guarantees can not mutual interference when display panel installs, through with 2 adjacent lateral walls of box respectively with the side of emulation board laminating aligns, guarantees 2 display panel and connects the precision of back front clearance.

Drawings

FIG. 1 is a schematic structural diagram of a case of a display screen in an embodiment;

FIG. 2 is a schematic structural diagram of a positioning device connecting box according to an embodiment;

FIG. 3 is a top view of one embodiment of a positioning device coupled to a housing;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of a gap positioning assembly of the positioning device according to an embodiment;

FIG. 6 is a rear view of a gap setting assembly of the positioning device of one embodiment;

FIG. 7 is a schematic structural diagram of a positioning pin of the positioning device according to an embodiment;

FIG. 8 is a flowchart illustrating steps of a method for installing a display screen in one embodiment.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a box body according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a positioning device according to an embodiment of the present invention connected to the box body, fig. 3 is a top view of a positioning device according to an embodiment of the present invention connected to the box body, fig. 4 is an enlarged view of a position a in fig. 3, and fig. 5 is a schematic structural diagram of a gap positioning assembly according to an embodiment of the present invention. The positioning device is used for connecting the box body 20 of the display module, and the box body 20 is used for being connected with a display panel of the display module. Through connecting a plurality of boxes 20 and installing display panel respectively on box 20, positioner can connect the constitution display screen with the multiunit display module assembly. The positioning device of the present invention includes a gap positioning assembly 100 and an angle positioning assembly 200.

The gap positioning assembly 100 includes 2 simulation boards 110, each simulation board 110 includes a first attachment surface 111 and a side surface 116 adjacent to the first attachment surface 111, in a general case, the side surface 116 is perpendicular to the first attachment surface 111, and the 2 simulation boards 110 are respectively detachably connected to the 2 cases 20 to be connected and used for simulating a splicing state when the 2 cases 20 are correspondingly mounted with display panels, and the 2 simulation boards 110 are rotatably connected, where a rotation axis is a splicing edge of the 2 simulation boards 110 far from the cases 20. The first attaching surface 111 is attached to the front end surface 24 of the box 20 to be assembled, and the side walls 25 of the 2 box 20 to be assembled for assembling are flush with the side surfaces 116 of the 2 simulation plates 110. The angle positioning assembly 200 includes a connecting block 210, the connecting block 210 is provided with two second abutting surfaces 211 arranged at a preset angle, and when the box body 20 is connected to the connecting block 210, the rear end surface 26 of the box body 20 abuts against the second abutting surfaces 211.

In the process of connecting the box body 20 of the display module, the rotating shafts 121 of the 2 simulation plates 110 of the gap positioning assembly 100 are arranged at the splicing edge far from the box body 20, when the 2 simulation plates 110 are attached to the front end surface 24 of the box body 20 at a certain angle, the rotatably connected 2 simulation plates 110 simulate the installation effect when a display panel is installed on the box body 20, and at the moment, the box body 20 can be arranged at any angle along with the simulation plates 110, for example, the 2 simulation plates can be arranged at 155 degrees, 165 degrees or 175 degrees. Through the simulation of clearance locating component 100, when can avoiding installing display panel, 2 display panel mutual interference, angle locating component 200 and the laminating of rear end face 26 of box 20, the precision of angle between the box 20 has been guaranteed, and the cooperation through angle locating component 200 and clearance locating component 100, when box 20 is connected to angle locating component, the precision in clearance between the box 20 has also been guaranteed, not only promoted the display effect after the concatenation of display module assembly, and need not readjust the relative position of box 20 when installing display panel, also reduced the probability that display panel received the damage in the installation when simplifying the installation procedure.

The thickness of the dummy board 110 of the present invention is arranged according to the actual display panel, and may be thicker or thinner than the display panel. For example, in some embodiments, when the thickness of the display panel is 5mm, the thickness of the dummy plate 110 may be 4.5mm to 6mm, for example, the thickness of the dummy plate 110 is 4.5mm, 5mm, 5.5mm, or 6 mm. In other embodiments, when the thickness of the display panel is 30mm, the thickness of the simulation board 110 may be 28mm to 32mm, for example, the thickness of the simulation board 110 is 28mm, 29mm, 30mm, or 32 mm.

Referring to fig. 6, in some embodiments, the dummy plate 110 is provided with a positioning pin 112, the positioning pin 112 is provided on the first attaching surface 111, an axis of the positioning pin 112 is perpendicular to the first attaching surface 111, the case 20 is provided with a positioning hole 21, the positioning hole 21 is provided on the front end surface 24 of the case 20, and when the first attaching surface 111 is attached to the front end surface 24, the positioning pin 112 is inserted into the corresponding positioning hole 21 for positioning between the dummy plate 110 and the case 20. The positioning pins 112 are advantageous in that, on one hand, the position accuracy between the dummy plate 110 and the case 20 is ensured, and the reduction of the accuracy of the gap and angle after the case 20 is connected due to the relative sliding between the dummy plate 110 and the case 20 during the operation process is avoided. On the other hand, when the 2 cases 20 connected with the dummy plates 110 are disposed at an angle, that is, the axes of the positioning pins 112 of the 2 dummy plates 110 are not parallel, the positioning pins 112 may be used to prevent the gap positioning member 100 attached to the case 20 from falling off.

In the present embodiment, a plurality of positioning pins 112 may be provided for each dummy board 110, and the positioning accuracy between the dummy board 110 and the case 20 can be further improved by providing a plurality of positioning pins 112 on the same dummy board 110. The positioning hole 21 can be a positioning hole 21 which is specially arranged on the box body 20 and used for positioning the simulation board 110, or can be a screw hole which is arranged on the box body 20 and used for being connected with the display panel, and the screw hole is used as the positioning hole 21, so that the special positioning hole can be prevented from being formed in the box body 20, the structure of the box body 20 is simplified, the production cost of the box body 20 is favorably reduced, and the weakening of the strength of the box body 20 due to the arrangement of redundant hole sites is avoided.

In some embodiments, the positioning pins 112 of at least one of the dummy plates 110 are telescopic positioning pins 1121, and specifically, the positioning pins 112 of one dummy plate 110 may be provided as telescopic positioning pins 1121, and the fixing positioning pins 1122 may be provided on another dummy plate 110. When the retractable positioning pin 1121 is in the extended position, the retractable positioning pin 1121 may extend into the positioning hole 21, and when the retractable positioning pin 1121 is in the retracted position, the end surface of the positioning pin 112 is not higher than the first abutting surface 111. After the 2 cases 20 are mounted on the connecting block 210 at a certain angle, the positioning pin 1121 of one of the dummy plates 110 is adjusted to the retracted position, so that the clearance positioning assembly 100 can be removed along the axial direction of the fixing positioning pin 1122 of the other dummy plate 110, and the advantage of providing the positioning pin 1121 on the dummy plate 110 is to prevent the positioning pin 112 from being damaged when the clearance positioning assembly 100 is directly removed.

Referring to fig. 4, in some embodiments, the telescopic positioning pin 1121 is threadedly coupled to the dummy plate 110, and specifically, the telescopic positioning pin 1121 is adjustable in extension and retraction by a screwdriver or an allen wrench.

Referring to fig. 7, in some embodiments, the positioning pin 1121 is elastically connected to the dummy plate 110, and an elastic member 113 is disposed in the gap positioning assembly 100, so that when the elastic member 113 is in a free state, the positioning pin 1121 is pressed against an extended position. Specifically, the telescopic positioning pin 1121 includes an insertion portion 1121a, a stepped portion 1121b, and an adjusting portion 1121c, the insertion portion 1121a is configured to be engaged with the positioning hole 21, the stepped portion 1121b is configured to limit an axial position of the telescopic positioning pin 1121, the elastic member 113 is sleeved on the adjusting portion 1121c, when the elastic member 113 is in a free state, the elastic member 113 supports the telescopic positioning pin 1121 at an extended position, and when the telescopic positioning pin 1121 needs to be retracted, the telescopic positioning pin 1121 can be pulled back through the adjusting portion 1121 c. The advantage of this arrangement is that when the gap positioning assembly 100 is disassembled, the telescopic positioning pin 1121 can be adjusted to the retracted state directly through the adjusting portion 1121c without using a special adjusting tool, so that the disassembling process is simplified, and the assembling efficiency is improved.

In some embodiments, the case 20 is provided with the magnet 22 embedded on the front end surface 24, the end surface of the magnet 22 away from the case 20 is not higher than the front end surface 24 of the case 20, the dummy plate 110 is made of a magnetic metal, for example, iron or an iron alloy, and when the dummy plate 110 is placed on the case 20, the dummy plate is attracted by the magnet 22, and the first attachment surface 111 is attached to the front end surface 24, so that the dummy plate 110 is detachably connected with the case 20. The magnet 22 provided on the case 20 is advantageous in that it can be used for the detachable connection of the gap setting assembly 100 to the case 20 when the case 20 is coupled, and the magnet 22 can also be used for the attachment of the display panel to the case 20 when the display panel is mounted.

In some embodiments, the simulation board 110 may also be made of a non-magnetic material, and a patch or a magnet is embedded in the simulation board 110 for being attracted to the magnet 22 on the case 20, so as to attach the first attachment surface 111 to the front end surface 24, thereby achieving the detachable connection between the simulation board 110 and the case 20. The advantage of providing the simulation board 110 as a non-magnetic material and embedding the iron sheet 114 or the magnet 22 is that not only the simulation board 110 is detachably connected with the case 20, but also the positioning of the simulation board 110 and the case 20 on the first abutting surface 111 can be realized by utilizing the magnetism of the magnet 22.

Preferably, the dummy plate 110 may be made of transparent plastic, for example, PMMA (polymethyl methacrylate), PS (polystyrene), PC (polycarbonate), or ABS (acrylonitrile butadiene styrene plastic) may be used, and the specific material of the dummy plate 110 is not limited herein. The provision of the emulation plate 110 as a transparent plastic is advantageous in that a specific structure of the case 20 and a position thereof can be directly observed through the emulation plate 110 when the emulation plate 110 is installed, contributing to an improvement in efficiency of attachment of the case 20.

In other embodiments, the simulated board 110 and the box 20 may be detachably connected by a snap, a screw, or a traceless removable glue or a traceless double-sided glue, and the connection manner of the simulated board 110 and the box 20 is not limited herein.

In some embodiments, the angle positioning assembly 200 includes a bolt 220, the bolt 220 includes a nut 221 and a threaded section 222, the case 20 is provided with the connection hole 23, the connection block 210 is provided with a threaded hole, an axis of the threaded hole is perpendicular to the second abutting surface 211, and the threaded section 222 passes through the connection hole 23 to lock the case 20 and the connection block 210.

Referring to fig. 5, in some embodiments, the dummy plate 110 is provided with a through hole 115 for a bolt 220 and/or a tool for installing the bolt 220 to pass through, a radial dimension of the through hole 115 is larger than a radial dimension of the nut 221, when the dummy plate 110 is attached to the box body 20, a projection of the connection hole 23 on a plane where the dummy plate 110 is located falls into the through hole 115, and when the bolt 220 is installed, the bolt 220 can be operated through the through hole 115 to lock the box body 20 with the connection block 210. The advantage of providing the through hole 115 is that the distance between the connecting hole 23 and the side wall 25 on the box 20 can be reduced, thereby facilitating the control of the size of the connecting block 210 and reducing the production cost of the positioning device.

In other embodiments, the housing 20 and the connection block 210 may be detachably connected by a snap fit or other means. Adopt detachably connected mode to connect box 20 and connecting block 210's benefit lies in, the display module assembly dismantles the convenience after connecting, is favorable to display module assembly and positioner's maintenance and transportation.

In other embodiments, the box 20 and the connecting block 210 can be further connected in a non-detachable manner, for example, the box 20 and the connecting block 210 can be connected in a manner of glue, welding or riveting, and the advantage of the non-detachable connection between the box 20 and the connecting block 210 is that the connection between the boxes 20 is more stable, and the performance of wind resistance and vibration resistance after the display module assembly is spliced is better.

In some embodiments, the angle positioning assembly 200 further includes a supporting member 230, and the supporting member 230 is disposed on a side of the connecting block 210 facing away from the box body 20 for supporting the display module after being assembled. In this embodiment, the connecting block 210 is not only used for connecting the display modules, but also used for supporting the display modules, and meanwhile, compared with supporting each display module, the arrangement of the supporting member 230 on the connecting block 210 is not only helpful for reducing the arrangement of the supporting member 230, but also is helpful for simplifying the structure of the box 20, thereby saving the manufacturing cost.

In this embodiment, the supporting member 230 is connected to the connecting block 210 by the bolt 220, which is advantageous in that the supporting member 230 and the connecting block 210 are easy to mount and dismount, and maintenance and transportation of the display module and the positioning device are facilitated. In other embodiments, the supporting member 230 and the connecting block 210 can be further configured as an integral structure, which has the advantages of more stable structure of the angle positioning assembly 200 and better wind and vibration resistance after the display module assembly is assembled.

In some embodiments, the 2 dummy plates 110 are connected by a hinge 120, and the hinge 120 includes a rotation shaft 121 and an engaging plate 122 rotatably connected by the rotation shaft 121. In other embodiments, the 2 dummy boards 110 may be connected by other rotation connection methods, and the connection method of the dummy boards 110 is not limited herein.

In some embodiments, the preset angle between the 2 second abutting surfaces 211 of the connecting block 210 is 150 ° to 180 °, for example, 150 °, 160 °, 170 ° or 180 °.

Referring to fig. 8, fig. 8 is a flowchart illustrating steps of a display screen installation method according to an embodiment of the present invention, and the present invention further provides a display screen installation method, including the following steps:

step S102, providing a positioning device 10;

step S104, respectively attaching the first attaching surfaces 111 of the 2 simulation boards 110 to the front end surfaces 24 of the box bodies 20 of the 2 display modules, and respectively aligning the side walls 25, which are used for splicing, of the 2 box bodies 20 to be spliced with the side surfaces 116 of the 2 simulation boards 110;

step S106, rotating the simulation board 110 and the box body 20 to enable the rear end surfaces 26 of the 2 box bodies 20 to be respectively attached to the 2 second attaching surfaces 211 of the connecting block 210;

step S108, locking the 2 boxes 20 with the connecting block 210;

step S110, removing the gap positioning assembly 100 attached to the front end surface 24 of the box body 20;

in step S112, a display panel is mounted on each of the cases 20.

According to the display screen installation method, the display modules of the planes are spliced at a certain angle to form the arc-shaped display screen. In the installation, the installation effect when utilizing 2 emulation boards 110 of rotating the connection to simulate installing display panel on box 20, when having avoided installing display panel, 2 display panel produce mutual interference, through the laminating of angle locating component 200 and the rear end face 26 of box 20, the precision of angle between the box 20 has been guaranteed, and the cooperation through angle locating component 200 and clearance locating component 100, when box 20 is connected to angle connecting component, the precision of the clearance between the box 20 has also been guaranteed, therefore, adopt this installation method not only to promote the display effect after the display module assembly concatenation, and need not readjust the relative position of box 20 when installing display panel at the in-process of installation, also avoided display panel's damage in the installation when simplifying installation procedure.

The utility model also provides a display screen which comprises the positioning device 10 or is obtained by adopting the display screen installation method.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a positioner for connect the box of display module assembly, the box is used for installing display module assembly's display panel, and its characterized in that, positioner includes:

the gap positioning assembly comprises 2 simulation plates, each simulation plate comprises a first binding surface and a side surface adjacent to the first binding surface, the 2 simulation plates are detachably connected to the 2 boxes to be spliced and are used for simulating the splicing state of the display panels of the 2 display modules, the 2 simulation plates are rotatably connected by taking the splicing edges of the two at the sides far away from the boxes as rotating axes, the first binding surfaces of the 2 simulation plates are respectively bound with the front end surfaces of the boxes to be spliced, and the side walls, used for splicing, of the 2 boxes to be spliced are respectively flush with the side surfaces of the 2 simulation plates;

the angle positioning assembly comprises a connecting block, the connecting block comprises 2 second binding faces which are preset in angle setting, and the box body is connected to the connecting block in a laminating mode.

2. The positioning device according to claim 1, wherein the dummy plate is provided with a positioning pin, the positioning pin is provided on the first abutting surface, and the case is provided with a positioning hole, into which the positioning pin is inserted when the first abutting surface abuts against the front end surface.

3. The positioning device according to claim 2, wherein the positioning pin of at least one of the dummy plates is a retractable positioning pin, the retractable positioning pin is inserted into the positioning hole when the retractable positioning pin is in the extended position, and an end surface of the retractable positioning pin is not higher than the first abutting surface when the retractable positioning pin is in the retracted position.

4. The positioning device of claim 3, wherein the retractable positioning pin is threadedly coupled to the simulated plate.

5. The positioning device of claim 3, wherein the clearance positioning assembly includes a resilient member that urges the retractable positioning pin against the extended position when the resilient member is in a free state.

6. The positioning device according to claim 1, wherein the box body is provided with a magnet, an end face of the magnet, which faces away from the box body, is not higher than the front end face, the simulation board is made of a magnetic metal material, and when the simulation board is placed on the box body, the first attaching face is attached to the front end face by the attraction of the magnet.

7. The positioning device according to claim 1, wherein the box body is provided with a magnet, an end face of the magnet, which faces away from the box body, is not higher than the front end face, the simulation board is made of a non-magnetic material, and an iron sheet is embedded in the simulation board and used for being adsorbed by the magnet to attach the first attaching face to the front end face.

8. The positioning device of claim 1, wherein the angular positioning assembly comprises a bolt, the bolt comprises a nut and a threaded section, the housing comprises a connecting hole, the connecting block comprises a threaded hole, and the threaded section passes through the connecting hole and is engaged with the threaded hole to lock the housing and the connecting block.

9. The positioning device as set forth in claim 8, wherein said dummy plate is provided with a through hole through which said bolt passes to lock said case body with said connection block.

10. A display screen comprising a positioning device according to any one of claims 1-9.

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