Patent Publication Number: US-2022227112-A1

Title: Laminating device and laminating method

Description:
CROSS-REFERENCE OF RELATED APPLICATIONS 
     The present application is a continuation of International Application No. PCT/CN2021/080788, filed on Mar. 15, 2021, which claims priority to Chinese Patent Application No. 202010345410.5, filed on Apr. 27, 2020, both of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present application relates to the technical field of flexible screen laminating equipment, in particular to a laminating device and a laminating method. 
     BACKGROUND 
     With the advent of the ubiquitous screen era, people&#39;s demand for full screens is becoming stronger. In order to increase the screen-to-body ratio, the hyperbolic laminating technology and the four-curved laminating technology came into being. 
     In the prior art, the flexibility of the flexible screen is mainly used to realize a full screen. The current laminating method of the flexible screen mainly use a silicone pad to press the flexible screen to the inner side of the curved cover plate. During the laminating process, because the laminating pressure in the plane area of the curved cover plate is greater than the laminating pressure in the bending area of the curved cover plate, the laminating pressure in the bending area is small, and bubbles are prone to appear, which will lead to poor laminating between the curved cover plate and the flexible screen. 
     Therefore, there is an urgent need for a new laminating device and laminating method 
     SUMMARY 
     The present application provides a laminating device and a laminating method, which aim to solve the problem of bubbles generated during the laminating process of the flexible screen and the cover plate. 
     The embodiment of the first aspect of the present application provides a laminating device for laminating a curved cover plate and a flexible screen. The laminating device includes at least one elastic support assembly and a flexible supporting board for supporting the flexible screen. The flexible supporting board includes a top wall and two side walls facing to each other in a width direction of the top wall. The top wall has a central spine portion extending along a length direction of the top wall and loading portions located on both sides of the central spine portion. The top wall is connected to one of the side walls through one of the loading portions. The side walls and the top wall enclose to form a hollow space; the elastic support assembly is located in the hollow space and is configured to support the flexible supporting board. The elastic support assembly is arranged to be deformable in the pressing direction of the curved cover plate so that the flexible supporting board is deformed from a first state to a second state under the pressing effect of the curved cover plate; wherein, in the first state, the flexible supporting board is in a shape of a ridge, and one of the loading portions is obliquely connected between the central spine portion and one of the side walls, so that during a process of the flexible supporting board being deformed from the first state to the second state, an inclination of the loading portion gradually decreases. 
     According to any one of the foregoing embodiments of the first aspect of the present application, a thickening portion is correspondingly located between the side wall and the elastic support assembly, and/or the laminating device further includes at least two elastic support assemblies, and the at least two elastic support assemblies are distributed along the width direction of the top wall, there is a space between two adjacent elastic support assemblies, and the thickening portion is correspondingly located between the two adjacent elastic support assemblies. 
     According to any one of the foregoing embodiments of the first aspect of the present application, the laminating device further includes at least two elastic support assemblies, the at least two elastic support assemblies are distributed in the width direction of the top wall, there is a space between two adjacent elastic support assemblies, and a heating component is located between the two adjacent elastic support assemblies, and/or the heating component is located between one of the elastic support assemblies and one of the side walls. 
     According to any one of the foregoing embodiments of the first aspect of the present application, the laminating device further includes a plurality of heating components, and the plurality of heating components are evenly distributed in the hollow space. 
     The embodiment of the second aspect of the present application also provides a laminating method, which uses the above-mentioned laminating device to laminate the curved cover plate and the flexible screen, and the method includes: 
     Placing the flexible screen on the flexible supporting board, and making the flexible supporting board in the first state; 
     Disposing the curved cover plate on the flexible screen in a covering manner; 
     Applying pressure to the curved cover plate to make the flexible supporting board deform from the first state to the second state. The inclination of the loading portion is gradually reduced. The two side walls move away from each other. The curved cover plate and the flexible screen are laminated gradually from the position corresponding to the central spine portion. 
     In the laminating device of the embodiment of the present application, the laminating device includes a flexible supporting board and at least one elastic support assembly. During the laminating process of the curved cover plate and the flexible screen, the flexible screen can be arranged on the top wall of the flexible supporting board in the first state. In the initial stage of pressing, the curved cover plate is firstly laminated at the position corresponding to the central spine portion. Then, pressure is applied to the curved cover plate, and since the elastic support assembly is arranged to be deformable in the pressing direction of the curved cover plate, the flexible supporting board can be deformed from the first state to the second state. During this process, the inclination of the loading portion gradually decreases, and the curved cover plate and the flexible screen are gradually laminated, that is, the contact between the flexible screen and the curved cover plate is gradually pressed from the middle to the two sides, which can effectively eliminate the air bubbles between the curved cover plate and the flexible screen, and can improve the product yield. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       By reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings, other features, purposes and advantages of the present application will become more apparent, wherein the same or similar reference signs indicate the same or similar features. 
         FIG. 1  is a schematic diagram of the structure of a laminating device; 
         FIG. 2  is a schematic diagram of a structure of a laminating device provided by an embodiment of the present application; 
         FIG. 3  is a schematic diagram of a structure of a laminating device in a first state according to an embodiment of the present application; 
         FIG. 4  is a schematic diagram of a structure of a laminating device in a second state according to an embodiment of the present application; 
         FIG. 5  is a front view of a laminating device in a first state according to another embodiment of the present application; 
         FIG. 6  is a front view of a laminating device in a second state according to another embodiment of the present application; 
         FIG. 7  is a top view of a laminating device provided by further another embodiment of the present application; 
         FIG. 8  is a schematic diagram of a structure of a laminating device provided by still another embodiment of the present application; 
         FIG. 9  is a schematic diagram of a structure of a laminating device from another perspective according to still another embodiment of the present application; 
         FIG. 10  is a schematic diagram of a structure of a laminating device provided by yet another embodiment of the present application; 
         FIG. 11  is a schematic diagram of a structure of a laminating device provided by yet another embodiment of the present application; 
         FIG. 12  is a schematic diagram of a structure of a laminating device in a first state according to an embodiment of the present application; 
         FIG. 13  is a schematic diagram of a structure of a laminating device in another state according to an embodiment of the present application; 
         FIG. 14  is a schematic diagram of a structure of a laminating device in a second state according to an embodiment of the present application; 
         FIG. 15  is a schematic diagram of a partial structure of a curved cover plate; 
         FIG. 16  is a schematic diagram of a partial structure of a flexible supporting board of a laminating device provided by an embodiment of the present application; 
         FIG. 17  is a schematic diagram of a partial structure of a protective pad of a laminating device provided by an embodiment of the present application; 
         FIG. 18  is a flowchart of a laminating method provided by an embodiment of the present application. 
     
    
    
     DETAILED DESCRIPTION 
     The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are proposed in order to provide a comprehensive understanding of the present application. However, it is obvious to the skilled person in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least part of the well-known structures and technologies are not shown in order to avoid unnecessary blurring of the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner. 
     The orientation words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms “mounting” and “connection” should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or indirect connection. For the skilled person in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to specific circumstances. 
     With the advent of the ubiquitous screen era, people&#39;s demand for full screens is becoming stronger. In order to increase the screen-to-body ratio, the hyperbolic laminating technology and the four-curved laminating technology came into being. However, the current surface laminating has a problem of low yield. 
     As shown in  FIG. 1 , a flexible silicone substrate  30  is generally used to realize the mutual laminating of the curved cover plate  10  and the flexible screen  20 . The curved cover plate  10  includes a curved portion  12  and a flat portion  11 . A typical curved cover plate  10  includes two curved portions  12  opposite to each other in the width direction, and the flat portion  11  is connected between the two curved portions  12 . The curved portion  12  has a relatively large curvature, and the flat portion  11  is generally flat. 
     The flexible silicone substrate  30  of  FIG. 1  includes a loading surface, and the shape of the loading surface matches the shape of the curved cover plate  10 . In the process of laminating the curved cover plate  10  and the flexible screen  20 , the flexible screen  20  is firstly placed on the loading surface, and then the curved cover plate  10  is pressed on the flexible screen  20 . 
     Since the laminating pressure of the flat portion  11  of the curved cover plate  10  is greater than the laminating pressure of the curved portion  12 , laminating bubbles are prone to appear in the curved portion  12 , and the risk of laminating rebound is prone to occur, resulting in poor laminating between the curved cover plate  10  and the flexible screen  20 . And when the minimum space between the two curved portions  12  is smaller than the width of the curved cover plate  10 , that is, when the opening of the curved cover plate  10  is small, the curved cover plate  10  and the flexible screen  20  cannot be laminated. 
     In order to solve the above technical problems, the present application is proposed. 
     In order to better understand the present application, the laminating device  1  and the laminating method of the embodiment of the present application will be described in detail below with reference to  FIGS. 2 to 19 . 
     Please refer to  FIGS. 2 and 3  together.  FIG. 2  is a schematic diagram of a structure of a laminating device  1  provided by an embodiment of the present application, and  FIG. 3  is a front view of a laminating device  1  provided by an embodiment of the present application, and  FIG. 4  is a schematic diagram of a structure of a laminating device  1  in another use state provided by an embodiment of the present application. 
     The laminating device  1  of the embodiment of the present application is used for laminating the curved cover plate  10  and the flexible screen  20 . The laminating device  1  includes: a flexible supporting board  100  for supporting the flexible screen  20  and at least one elastic support assembly  200 . The flexible supporting board  100  includes a top wall  110  and two side walls  120  facing to each other in a width direction of the top wall (X direction in  FIG. 2 ). The top wall  110  has a central spine portion  111  formed by extending along a length direction of the top wall (Y direction in  FIG. 2 ) and loading portions  112  located on both sides of the central spine portion  111 . The top wall  110  is connected to one of the side walls  120  through one of the loading portions  112 , and the side walls  120  and the top wall  110  enclose to form a hollow space. The elastic support assembly  200  is located in the hollow space and is used to support the flexible supporting board  100 . The elastic support assembly  200  is arranged to be deformable in the pressing direction of the curved cover plate  10  so that the flexible supporting board  100  can be deformed from a first state to a second state under the pressing effect of the curved cover plate  10 . In the first state, the flexible supporting board  100  is in a shape of a ridge, and the loading portion  112  is obliquely connected between the central spine portion  111  and one of the side walls  120 , so that during the process of the flexible supporting board  100  being deformed from the first state to the second state, the inclination of the loading portion  112  gradually decreases. 
     The gradual decrease in the inclination of the loading portion  112  means that the angle between the loading portion  112  and the horizontal direction is gradually reduced. When the inclination of the loading portion  112  gradually decreases, the flexible supporting board  100  changes from a bent state to a flattened state. 
     The first state and the second state can be disposed in many ways.  FIG. 3  is a schematic diagram of a structure of the flexible supporting board  100  in the first state in the embodiment of the present application.  FIG. 4  is a schematic diagram of a structure of the flexible supporting board  100  in the second state in the embodiment of the present application. In the process of the flexible supporting board  100  being deformed from the first state to the second state, the top wall  110  changes from the ridge shape in  FIG. 3  to the plane shape in  FIG. 4 . 
     The structure of the flexible supporting board  100  in a natural state can be disposed in many ways. For example, the flexible supporting board  100  is in the first state as shown in  FIG. 3  in the natural state, and the flexible screen  20  can be directly disposed on the flexible supporting board  100  in the natural state (i.e. the first state) when use. Or, the flexible supporting board  100  is in the second state as shown in  FIG. 4  in the natural state, before the flexible screen  20  is disposed on the flexible supporting board  100 , or after the flexible screen  20  is disposed on the flexible supporting board  100 , the flexible supporting board  100  is driven to be in the first state, and the flexible supporting board  100  is changed from the first state to the second state during the laminating process of the flexible screen  20  and the curved cover plate  10 . 
     In  FIG. 3 , in order to show the structure of the flexible supporting board  100  more clearly, the top wall  110 , the central spine portion  111 , the loading portion  112 , and the side walls  120  are defined on the flexible supporting board  100  with dotted lines. The dotted line does not constitute a structural limitation of the laminating device  1  of the embodiment of the present application. 
     The pressing direction of the curved cover plate can be disposed in many ways. For example, the pressing direction of the curved cover plate is a vertical direction or a horizontal direction. The embodiment of the present application will be described with an example in which the pressing direction of the curved cover plate is the height direction of the laminating device  1  (the Z direction in  FIG. 2 ). 
     In the laminating device  1  of the embodiment of the present application, the laminating device  1  includes a flexible supporting board  100  and at least one elastic support assembly  200 . During the laminating process of the curved cover plate  10  and the flexible screen  20 , the flexible screen  20  may be disposed on the top wall  110  of the flexible supporting board  100  in the first state. In the initial stage of pressing, the curved cover plate  10  is firstly laminated at the position corresponding to the central spine portion  111 . Then, pressure is applied to the curved cover plate  10 , and since the elastic support assembly  200  is deformable in the pressing direction of the curved cover plate  10 , the flexible supporting board  100  can be deformed from the first state to the second state. During this process, the inclination of the loading portion  112  gradually decreases, and the curved cover plate  10  and the flexible screen  20  are gradually laminated, that is, the contact between the flexible screen  20  and the curved cover plate  10  is realized by gradually pressing from the middle to the two sides, which can effectively eliminate the air bubbles between the curved cover plate  10  and the flexible screen  20  and improve the product yield. 
     In addition, in the laminating device  1  of the embodiment of the present application, when the flexible supporting board  100  is deformed from the first state to the second state, the inclination of the loading portion  112  gradually decreases, and the size of the loading portion  112  in the width direction of the top wall gradually increase. When the bending angle of the curved portion  12  on the curved cover plate  10  is large, so that the minimum size between the two curved portions  12  on the curved cover plate  10  is smaller than the size of the flat portion  11 , that is, when the size of the opening of the curved cover plate  10  is smaller than the width of the curved cover plate  10 , the curved cover plate  10  can still be fastened to the top wall  110 , and the flexible screen  20  and the curved cover plate  10  are gradually pressed together from the inside to the outside. 
     Please continue to refer to  FIG. 2 . In some alternative embodiments, the laminating device  1  further includes a pressing station  600 , the pressing station  600  includes a receiving groove  610  for accommodating the curved cover plate  10 , and the pressing station  600  is located on the side of the flexible supporting board  100  away from the elastic support assembly  200 , and the pressing station  600  is arranged to be movable along the pressing direction of the curved cover plate  10 . 
     In these alternative embodiments, during the laminating process of the curved cover plate  10  and the flexible screen  20 , the curved cover plate  10  may be disposed in the pressing station  600 , and the pressing station  600  may be driven in a direction close to the flexible supporting board  100 , thereby causing that the curved cover plate  10  provides a pressing force to the flexible supporting board  100 , so as to press the curved cover plate  10  onto the flexible screen  20 . 
     In some optional embodiments, the laminating device  1  further includes a heating component  700  arranged in the hollow space. The heating component  700  can provide heat energy to the flexible supporting board  100  and the flexible screen  20  disposed on the flexible supporting board  100 , so that the flexible screen  20  has a good flexibility and the flexible supporting board  100  can be better deformed. 
     When the laminating device  1  further includes at least two elastic support assemblies  200 , and the at least two elastic support assemblies  200  are distributed in the width direction of the top wall, there is a space between two adjacent elastic support assemblies, the heating component  700  is located between the two adjacent elastic support assemblies  200 , and/or the heating component  700  is located between one of the elastic support assemblies  200  and one of the side walls  120 . 
     In some optional embodiments, a plurality of heating components  700  are evenly distributed in the hollow space, so that the plurality of heating components  700  can provide uniform heat energy to the flexible supporting board  100  and the flexible screen  20 . 
     The elastic support assembly  200  can provide support to the flexible supporting board  100  by a plurality of ways. For example, the elastic support assembly  200  has elasticity, one end of the elastic support assembly  200  can be disposed on any supporting surface, and the other end of the elastic support assembly  200  is connected to the top wall  110  so that the elastic support assembly  200  can provide support to the flexible supporting board  100 . 
     In some optional embodiments, the laminating device  1  further includes a base  300 , and the elastic support assembly  200  is supported and connected between the base  300  and the top wall  110 . The base  300  can provide good support to the elastic support assembly  200  and the flexible supporting board  100 . 
     In some optional embodiments, the elastic support assembly  200  includes a support portion  210  formed by extending in the length direction of the top wall and at least two reset portions  220  connected to the support portion  210 . The reset portion  220  is connected to a side of the support portion  210  facing away from the flexible supporting board  100 . The support portion  210  is used to support the flexible supporting board  100 , and at least two reset portions  220  are distributed along the length direction of the top wall, there is a space between two adjacent reset portions, so that the at least two reset portions  220  can stably support the support portion  210 . Each of the reset portions  220  is deformable in the pressing direction of the curved cover plate, and the deformation of the reset portions  220  enables the flexible supporting board  100  to be deformed from the first state to the second state. 
     In some optional embodiments, one support portion  210  is provided with two reset portions  220  correspondingly, and the two reset portions  220  are connected to both ends of the support portion  210  in the length direction of the top wall. In other optional embodiments, one support portion  210  may also be correspondingly provided with at least three reset portions  220 , and the at least three reset portions  220  are distributed in the length direction of the top wall, there is a space between two adjacent reset portions, and the at least three reset portions  220  are connected to the same support portion  210 . 
     In some optional embodiments, the reset portion  220  is retractable in the pressing direction of the curved cover plate, so that the flexible supporting board  100  can be changed from the first state to the second state. 
     Or, in other optional embodiments, the reset portion  220  can be in a reciprocating deformation in the pressing direction of the curved cover plate, so that the flexible supporting board  100  can be changed between the first state and the second state mutually, and the flexible supporting board  100  can be used repeatedly. 
     The reset portion  220  can deform in many ways. For example, the reset portion  220  includes a deforming portion  225  and a connecting portion  226  which are successively distributed in the pressing direction of the curved cover plate. The deforming portion  225  is connected to the support portion  210  through the connecting portion  226 , and the deforming portion  225  is deformable in the pressing direction of the curved cover plate. 
     Or, please refer to  FIG. 5  and  FIG. 6  together.  FIG. 5  shows a schematic diagram of a structure of the laminating device  1  in the first state in another embodiment of the present application. In order to show the structure of the base  300 , a cross-sectional view of the base  300  is shown in  FIG. 5 .  FIG. 6  shows a schematic diagram of a structure of the laminating device  1  in the second state in another embodiment of the present application. 
     In other optional embodiments, the base  300  is provided with a through hole  310 ; the reset portion  220  includes a guide rod  221  and an elastic member  222 . One end of the guide rod  221  is located in the through hole  310  and is arranged to be movable along the through hole  310  in the pressing direction of the curved cover plate. The elastic member  222  is arranged on the guide rod  221  and is arranged to be in a reciprocating deformation along the guide rod  221 . 
     In these alternative embodiments, the reset portion  220  includes a guide rod  221  and an elastic member  222  so that the elastic member  222  can move along the guide rod  221 . By properly disposing the extension direction of the guide rod  221 , the deformation direction of the elastic member  222  can be controlled, and then the deformation direction of the reset portion  220  can be controlled, so that the flexible supporting board  100  can be deformed in a preset manner. In the process of resetting and deforming of the elastic member  222 , the guide rod  221  is arranged to be movable in the through hole  310 , so that the space between the flexible supporting board  100  and the base  300  will be changed, and thus the flexible supporting board  100  can be deformed from the first state to the second state. 
     In some optional embodiments, the guide rod  221  has a first end  221   a  and a second end  221   b  opposite to each other in the pressing direction of the curved cover plate. The second end  221   b  is connected to the support portion  210 , and the first end  221   a  is connected to a first baffle  223 . The first baffle  223  is located on the side of the base  300  away from the top wall  110  to prevent the guide rod from falling off from the through hole  310 , so that the guide rod  221  can be in a reciprocating movement in the pressing direction of the curved cover plate in the through hole  310 . 
     The elastic member  222  can be arranged in many ways. For example, the elastic member  222  is a spring, and the spring is sleeved on the guide rod  221  so that the spring can be in a reciprocating deformation along the guide rod  221 . 
     In some optional embodiments, the guide rod  221  is further provided with a second baffle  224 . The second baffle  224  is located between the base  300  and the top wall  110 , and the elastic member  222  is located between the base  300  and the second baffle  224 . By providing the second baffle  224 , the elastic member  222  can be provided with a position limit, so that the elastic member  222  can be in a reciprocating deformation between the second baffle  224  and the base  300 . 
     In some optional embodiments, when the laminating device  1  includes the base  300 , the side wall  120  can be movable relative to the base  300  in the width direction of the top wall. When the flexible supporting board  100  is deformed from the first state to the second state, the inclination of the loading portion  112  gradually decreases, and the space between the side wall  120  and the central spine portion  111  gradually increases. 
     In these alternative embodiments, the side walls  120  are arranged to be movable relative to the base  300 , so that the two side walls  120  can move away from each other. The size of the flexible supporting board  100  in the width direction of the top wall gradually increases, and the curved cover plate  10  and the flexible screen  20  are gradually laminated. 
     The number of the elastic support assembly  200  can be disposed in many ways, and the number of the elastic support assembly  200  can be one or more. In some optional embodiments, the elastic support assembly  200  includes a first support assembly  200   a  connected between the central spine portion  111  and the base  300 , and the first support assembly  200   a  is used to support the central spine portion  111 . When the flexible supporting board  100  is deformed from the first state to the second state, the first support assembly  200   a  is used to provide elastic support to the central spine portion  111  so that the central spine portion  111  can move in a direction close to the base  300 . 
     In some optional embodiments, the first support assembly  200   a  and the central spine portion  111  are fixedly connected so as to avoid tilting of the central spine portion  111  when moving in a direction close to the base  300 . 
     The first support assembly  200   a  can be fixedly connected to the central spine portion  111  in many ways. In some alternative embodiments, the support portion  210  of the first support assembly  200   a  and the central spine portion  111  are fixedly connected. For example, the support portion  210  of the first support assembly  200   a  is welded to the central spine portion  111 . 
     Or, in some optional embodiments, the top wall  110  is provided with a first clamping portion  113  on the surface facing the first support assembly  200   a , and the support portion  210  of the first support assembly  200   a  and the first clamping portion  113  are fixedly connected in a clamping manner. 
     In these alternative embodiments, the support portion  210  of the first support assembly  200   a  and the central spine portion  111  are connected by the first clamping portion  113  in a clamping manner, which facilitates the mounting and removal of the laminating device  1 . During the transportation of the laminating device  1 , the laminating device  1  can be disassembled to reduce the occupied space of the laminating device  1 , which facilitates the transportation of the laminating device  1 . 
     In some optional embodiments, the first clamping portion  113 , the support portion  210  of the first support assembly  200   a , and the central spine portion  111  have the same size in the length direction, so that the first support assembly  200   a  can provide good support for the central spine portion  111 . 
     The first clamping portion  113  is connected to the support portion  210  in a clamping manner in many ways. In some optional embodiments, one of the first clamping portion  113  and the support portion  210  is a clamping groove, and the other is a clamping column, and the clamping column is clamped in the clamping groove. 
     As shown in  FIGS. 3 to 5 , the support portion  210  has a columnar structure, the support portion  210  is a clamping column, the first clamping portion  113  is a clamping groove, and the support portion  210  is clamped in the clamping groove. 
     In some alternative embodiments, please also refer to  FIG. 7  together, the size of the opening of the clamping groove is smaller than the size of the support portion  210  so as to prevent the support portion  210  from being detached from the clamping groove via the opening when the flexible supporting board  100  is deformed from the second state to the first state. 
     The side wall  120  can be movable relative to the base  300  in the width direction in many ways. Please continue to refer to  FIG. 7 . When the number of the elastic support assembly  200  is one, the laminating device  1  further includes a sliding portion  400 . The sliding portion is supported and connected between the side wall  120  and the base  300 . The sliding portion  400  is arranged to be slidable along the base  300  in the width direction of the top wall, so that the side wall  120  is arranged to be movable relative to the base  300  through the sliding portion  400  in the width direction of the top wall. 
     In these alternative embodiments, the sliding portion  400  can not only provide support to the side wall  120 , but also provide good support to the curved portion  12  at the junction of the side wall  120  and the loading portion  112 , and ensure complete laminating of the curved portion  12  of the curved cover plate  10  and the flexible screen  20 . In addition, the side wall  120  can also move relative to the base  300  through the sliding portion  400 . 
     The base  300  is provided with two limiting portions  320  respectively at two ends in the width direction of the top wall. The sliding portion  400  is located between the two limiting portions  320 , and in the first state, there is a predetermined distance between the sliding portion  400  and the limiting portion  320 . 
     In these alternative embodiments, a limit portion  320  is provided on the base  300  to limit the sliding portion  400  so as to prevent the side wall  120  from moving too far and prevent causing irreversible deformation of the flexible supporting board  100 . At the same time, the limiting portion  320  can provide a limiting force to the side wall  120 , thereby increasing the support of the side wall  120  to the flexible screen  20 , and ensuring that laminating bubbles generated between the flexible screen  20  and the curved cover plate  10  can be avoided. 
     The sliding portion  400  can be disposed in many ways. In some optional embodiments, as shown in  FIG. 7 , the sliding portion  400  includes a pulley  410 . One of the side walls  120  is arranged to be movable relative to the base  300  through the pulley  410 . For example, an end of the side wall  120  away from the loading portion  112  is provided with a receiving portion  130 . The pulley  410  is arranged in the receiving portion  130 , and the pulley  410  is arranged to be movable relative to the base  300 . 
     Or, in other alternative embodiments, please continue to refer to  FIG. 6 , the sliding portion  400  includes a sliding block  420  and at least two pulleys  410 . The pulleys  410  are arranged on the side of the sliding block  420  facing the base  300 , and at least two pulleys  410  are distributed in the width direction of the top wall and there is a space between two adjacent pulleys. The one of the side walls  120  is hinged with the sliding block  420 . 
     In these alternative embodiments, the sliding portion  400  includes a sliding block  420 , and the sliding block  420  can provide good support to the side wall  120 . The sliding block  420  is provided with at least two pulleys  410  on the side of the sliding block  420  facing the base  300 . The at least two pulleys  410  are distributed in the width direction of the top wall and there is a space between two adjacent pulleys. The sliding block  420  can move relative to the base  300  through the pulleys  410  in the width direction of the top wall. During the process of the flexible supporting board  100  being deformed from the first state to the second state, the two side walls  120  move in directions away from each other, and the distance between the side walls  120  and the base  300  gradually decreases, and the one of the side walls  120  is hinged with the sliding block  420 , so that the angle between the side wall  120  and the sliding block  420  can be changed, and the normal and stable laminating is ensured. 
     Please refer to  FIGS. 8 to 11  together.  FIG. 8  is a schematic diagram of the three-dimensional structure of the laminating device  1  in another embodiment of the present application;  FIG. 9  is a front view of the laminating device  1  in another embodiment of the present application;  FIG. 10  is a front view of the laminating device  1  in further another embodiment of the present application;  FIG. 11  is a front view of the laminating device  1  in still another embodiment of the present application. 
     In other optional embodiments, the number of elastic support assemblies  200  is at least two, and the at least two elastic support assemblies  200  further include a plurality of second support assemblies  200   b , and the plurality of second support assemblies  200   b  are located on two sides of the first support assembly  200   a  in the width direction of the top wall, and the second support assemblies  200   b  are used to support the loading portions  112 . 
     In these alternative embodiments, the second support assembly  200   b  can provide support to the loading portion  112  so as to prevent the loading portion  112  from being irreversibly deformed during the pressing process of the curved cover plate  10 . 
     When the loading portion  112  is supported by the second support assembly  200   b , in the first state, the height of the second support assembly  200   b  relative to the base  300  is lower than the height of the first support assembly  200   a  relative to the base  300 , so that the flexible supporting board  100  can be formed in a ridge shape, and the loading portion  112  is obliquely connected between the central spine portion  111  and the side wall  120 . In the second state, the height of the second support assembly  200   b  relative to the base  300  is equal to the height of the first support assembly  200   a  relative to the base  300 , so that the top wall  110  is flat, and the flexible screen  20  and the flat portion  11  of the curved cover plate  10  are mutually laminated. 
     The number of the second support assembly  200   b  is not limited. In some optional embodiments, in order to ensure the force balance of the flexible supporting board  100 , the number of the second support assemblies  200   b  on two sides of the first support assembly  200   a  in the width direction are equal. That is, the two loading portions  112  are supported by the same number of second support assemblies  200   b.    
     Further, in some optional embodiments, the spacing distances between two adjacent elastic support assemblies  200  in the width direction are equal, so that the forces on the top wall  110  are balanced. 
     In some optional embodiments, the loading portion  112  is arranged to be movable relative to the base  300  through the second support assembly  200   b  in the width direction of the top wall. In these alternative embodiments, during a process of the flexible supporting board  100  being deformed from the first state to the second state, the loading portion  112  is arranged to be movable relative to the base  300  through the second support assembly  200   b  in the width direction of the top wall, so that the inclination of the loading portion  112  can be gradually reduced, and the extension size of the loading portion  112  in the width direction of the top wall gradually increases. 
     The loading portion  112  and the second support assembly  200   b  are relatively movable in the width direction in many ways. In some alternative embodiments, as shown in  FIGS. 9 and 10 , the support portion  210  of the second support assembly  200   b  can be rotatably connected to the guide rod  221 , so that the loading portions  112  are arranged to be movable relative to the second support assembly  200   b  through the support portions  210  in the width direction of the top wall. In the process of decreasing the inclination of the loading portion  112 , the support portion  210  rolls, so that the loading portion  112  can move relative to the base  300  in the width direction of the top wall. For example, the support portion  210  of the second support assembly  200   b  is a roller, and the roller is rotatably connected to the guide rod  221  of the second support assembly  200   b.    
     In other alternative embodiments, as shown in  FIG. 11 ,  FIG. 11  shows a cross-sectional view of the base  300 . At least two through holes  310  are provided. The at least two through holes  310  include a first through hole  310   a  corresponding to the first support assembly  200   a  and a plurality of second through holes  310   b  respectively corresponding to the second support assemblies. One of the second through holes  310   b  is a cashew shaped hole extending in the width direction of the top wall, and one of the second support assemblies  200   b  is disposed to be movable in the cashew shaped hole in the width direction of the top wall. The loading portions  112  are arranged to be movable relative to the base  300  through the second support assemblies  200   b  in the width direction of the top wall. 
     When the second through hole  310   b  is a cashew shaped hole, in some optional embodiments, the second support assembly  200   b  and the loading portion  112  may be fixedly connected, and the loading portion  112  drives the second support assembly  200   b  to move in the width direction of the top wall. 
     The second support assembly  200   b  is fixedly connected to the loading portion  112  in many ways. For example, the support portion  210  of the second support assembly  200   b  and the loading portion  112  are connected to each other by welding. 
     Or, in other optional embodiments, the fixed connection manner of the second support assembly  200   b  and the loading portion  112  is the same as the fixed connection manner of the first support assembly  200   a  and the central spine portion  111 . 
     In some optional embodiments, the surface of the loading portion  112  facing the second support assembly  200   b  is provided with a second clamping portion  114 , and the support portion  210  of the second support assembly  200   b  and the second clamping portion  114  are fixedly connected in a clamping manner. The second support assembly  200   b  is fixedly connected to the loading portion  112  in a clamping manner, that is, the second support assembly  200   b  is detachably connected to the loading portion  112  through the support portion  210  and the second clamping portion  114 , which facilitates the disassembly and mounting of the laminating device  1 , and then is convenient for the transportation of the laminating device  1 . 
     In some optional embodiments, the second clamping portion  114 , the support portion  210  of the second support assembly  200   b , and the loading portion  112  have the same size in the length direction. This enables the second support assembly  200   b  to provide good support to the loading portion  112 . 
     In some optional embodiments, one of the support portion  210  of the second support assembly  200   b  and the second clamping portion  114  is a clamping groove, and the other is a clamping post, and the clamping post is clamped in the clamping groove. Further, the size of the opening of the clamping groove is smaller than the size of the clamping post, so that the clamping groove can provide a limit to the clamping post, preventing the clamping post from being detached from the clamping groove via the opening. 
     When at least two elastic support assemblies  200  are provided, as shown in  FIG. 10 , the side wall  120  can be suspended so that the side wall  120  can be arranged to be movable relative to the base  300  in the width direction of the top wall. When the flexible supporting board  100  is deformed from the first state to the second state, since the side wall  120  is suspended, the side wall  120  can move freely in the width direction of the top wall. 
     When at least two elastic support assemblies  200  are provided, as shown in  FIG. 11 , a sliding portion  400  may also be provided on the side wall  120 , and the side wall is arranged to be movable relative to the base  300  through the sliding portion  400  in the width direction of the top wall. 
     Please refer to  FIGS. 12 to 14  together.  FIGS. 12 to 14  show schematic diagrams of the use process of the laminating device  1  in an embodiment of the present application.  FIG. 12  shows a schematic diagram of a structure of the flexible supporting board  100  of the laminating device  1  in the first state in an embodiment of the present application.  FIG. 13  shows a schematic view of a structure of the flexible supporting board  100  of the laminating device  1  in the embodiment of the present application when it is deformed from the first state to the second state.  FIG. 14  shows a schematic diagram of a structure of the flexible supporting board  100  of the laminating device  1  in the second state in the embodiment of the present application. 
     According to the laminating device  1  of the embodiment of the present application, in the initial stage of pressing, when the flexible supporting board  100  is in the first state, the curved cover plate  10  is firstly laminated at the position corresponding to the central spine portion  111 . Pressure is applied to the curved cover plate  10 . During the process of the flexible supporting board  100  being deformed from the first state to the second state, the contact of the curved cover plate  10  and the flexible screen  20  is realized by gradually pressing from the middle to the two sides. Finally, the curved cover plate  10  and the flexible screen  20  are completely laminated. 
     The embodiment of the present application can effectively reduce the bubbles between the curved cover plate  10  and the flexible screen  20  and improve the product yield. And in the first state, the size of the flexible supporting board  100  in the width direction of the top wall is small. When the bending angle of the curved portion  12  of the curved cover plate  10  is large, the flexible screen  20  on the flexible supporting board  100  can still be laminated with the curved cover plate  10  by gradually pressing from the middle to the two sides. 
     In some optional embodiments, the shape of the flexible supporting board  100  is adapted to the shape of the curved cover plate  10 . When a hole is provided on the curved cover plate  10 , a through hole  310  is provided at the corresponding position of the flexible supporting board  100  so as to prevent the protective pad  500  from rubbing against the hole wall of the hole under the squeeze of the flexible supporting board  100 . 
     In some alternative embodiments, the side wall  120  includes an extension portion  121  and a transition portion  122 . The side wall  120  and the loading portion  112  are smoothly connected by a transition portion  122 , and the shape of the transition portion  122  is adapted to the shape of the curved portion  12  on the curved cover plate  10 , so that the curved portion  12  can be completely laminated to the flexible screen  20 . For example, when the curved portion  12  is provided on the outside of the transition portion  122  in a covering manner, the curved portion  12  and the transition portion  122  can be arranged equidistantly. 
     Please refer to  FIGS. 15 and 16  together.  FIG. 15  shows a schematic diagram of a partial structure of the curved cover plate  10 , and  FIG. 16  shows a schematic diagram of a partial structure of the top wall  110 . 
     In some optional embodiments, when the curved portion  12  has a circular arc shape, the transition portion  122  has a circular arc shape, and the center of the circle where the circular arc of the curved portion  12  is located coincides with the center of the circle where the circular arc of the transition portion  122  is located. Further, the lines connecting the two ends of the curved portion  12  and the center of the circle where the circular arc of the curved portion  12  is located forms an a angle, and the lines connecting the two ends of the transition portion  122  and the center of the circle where the arc circle of the transition portion  122  is located forms a  13  angle, and the a angle and the  13  angle are equal. 
     When the surface of the flexible supporting board  100  is provided with a protective film, the radius R of the circular arc where the curved portion  12  is located and the radius r of the circular arc where the transition portion  122  is located satisfy the following formula: 
         R=r+d 1+ d 2  (1)
 
     Wherein d1 is the thickness of the flexible supporting board  100 , and d2 is the thickness of the protective film. 
     When the surface of the flexible supporting board  100  is sequentially provided with a protective film and a guide film  800 , the radius R of the circular arc where the curved portion  12  is located and the radius r of the circular arc where the transition portion  122  is located satisfy the following formula: 
         R=r+d 1+ d 2+ d 3  (2)
 
     Wherein d3 is the thickness of the guide film  800 . 
     When the radius R of the circular arc where the curved portion  12  is located and the radius r of the circular arc where the transition portion  122  is located satisfy the above relationship, it can be ensured that the spacing distance between the curved portion  12  and the transition portion  122  is consistent, so that the flexible screen  20  and the curved cover plate  10  can be laminated curvely. 
     The flexible supporting board  100  can be made of any suitable material, as long as the flexible supporting board  100  can be deformed and the flexible supporting board  100  can be deformed from the first state to the second state. In some optional embodiments, the material of the flexible supporting board  100  includes an elastic steel plate, and the elastic deformation of the elastic steel plate is used to enable the flexible supporting board  100  to be transformed between the first state and the second state. Further, in some optional embodiments, the material of the flexible supporting board  100  includes 60Si2MnA. 
     The thickness of the flexible supporting board  100  is disposed in many ways. In some optional embodiments, the thickness of the flexible supporting board  100  is 0.5 mm to 3 mm. When the thickness of the flexible supporting board  100  is between 0.5 mm and 3 mm, it can prevent the flexible supporting board  100  from being unable to carry the flexible screen  20  and the curved cover plate  10  due to the insufficient thickness of the flexible supporting board  100 , and it can also prevent the flexible supporting board  100  from being difficult to deform caused by that the flexible carry board  100  is too thick. Further, the thickness of the flexible supporting board  100  is 1 mm-2 mm. 
     In some optional embodiments, the surface of the flexible supporting board  100  facing away from the elastic support assembly  200  is provided with a protective pad  500 . The flexible screen  20  can be placed on the protective pad  500 , and the protective pad  500  can provide the protection for the flexible screen  20 , avoiding excessive hardness of the flexible supporting board  100  from damaging the flexible screen  20 , and improving the product yield. 
     The material of the protective pad  500  can be disposed in many manner. For example, the material of the protective pad  500  includes silica gel, or the material of the protective pad  500  includes at least one of polyimide film, polyester film, magnesium fluoride film, zinc sulfide film and organic-inorganic laminated film. The use of these materials can ensure that the protective pad  500  has good flexibility. 
     Please also refer to  FIG. 17  together.  FIG. 17  shows a schematic diagram of a partial structure of the protective pad  500 . 
     In some optional embodiments, the protective pad  500  includes a body portion  510  and a thickening portion  520  disposed on the body portion  510 , and the thickening portion  520  has a thickness greater than that of the body portion  510 . By providing the thickening portion  520 , the supporting effect of the protective pad  500  for the flexible screen  20  can be improved, and the flexible screen  20  can be prevented from being squeezed and deformed. 
     The position of the thickening portion  520  can be disposed in many ways. In some optional embodiments, the thickening portion  520  is correspondingly located between the side wall  120  and the elastic support assembly  200 . The portion of the loading portion  112  located between the side wall  120  and the elastic support assembly  200  is not supported, and there may be a problem of insufficient support. The thickening portion  520  is correspondingly disposed between the side wall  120  and the elastic support assembly  200  so as to improve the supporting force at this position, which prevents the flexible screen  20  from being squeezed and deformed. 
     In other optional embodiments, the number of elastic support assemblies  200  is at least two, at least two the elastic support assemblies  200  are distributed in the width direction of the top wall, there is a space between two adjacent elastic support assemblies, and the thickening portion  520  is correspondingly located between the adjacent elastic support assemblies  200 . The portion of loading portion  112  located between the adjacent elastic support assemblies  200  may have a problem of insufficient support. Disposing the thickening portion  520  correspondingly between the adjacent elastic support assemblies  200  can increase the supporting force at this position and prevent the flexibility screen  20  from being squeezed and deformed. 
     The thickness of the protective pad  500  can be disposed in various ways. In some optional embodiments, the thickness of the protective pad  500  is 0.5 mm to 8 mm. The thickness of the protective pad  500  is within the range of 0.5 mm-8 mm, which can prevent from generating air bubbles between the curved cover plate  10  and the flexible screen  20  due to the protective pad  500  is too thick, and it can also prevent the protective pad  500  from providing adequate protection due to the protective pad  500  is too thin. 
     When the protective pad  500  includes the body portion  510  and the thickening portion  520 , in some optional embodiments, the thickness of the body portion  510  is 0.5 mm to 3 mm, and the thickness of the thickening portion  520  is 2.5 mm to 6 mm. 
     Please refer to  FIG. 18  together. The second embodiment of the present application also provides a laminating method for laminating the curved cover plate  10  and the flexible screen  20 . The method is completed by using the laminating device  1  of any of the above embodiments. The methods include: 
     Step S 1 : Placing the flexible screen on the flexible supporting board, and making the flexible supporting board in the first state. 
     As described above, the flexible supporting board  100  in the first state is in the shape of a ridge, and the loading portion  112  is arranged obliquely. When the laminating device  1  includes the base  300 , the distance between the central spine portion  111  and the base  300  is greater than the distance between the loading portion  112  (that is, the sidewall  120 ) and the base  300 . 
     When the laminating device  1  includes the protective pad  500  and the guide film  800 , the protective pad  500  is firstly disposed on the flexible supporting board  100 , and then the guide film  800  is disposed on the protective pad  500 , and then the flexible screen  20  is placed on the guide film  800 . When the flexible screen  20  is placed on the guide film  800  and the curved cover plate  10  has not yet been pressed, the flexible supporting board  100  is in the first state. 
     When the flexible supporting board  100  is in the first state as shown in  FIG. 3  in the natural state, the flexible screen  20  is directly disposed on the flexible supporting board  100  in the natural state (i.e. the first state) when use. When the flexible supporting board  100  is in the second state as shown in  FIG. 4  in the natural state, before the flexible screen  20  is disposed on the flexible supporting board  100 , or after the flexible screen  20  is disposed on the flexible supporting board  100 , the flexible supporting board  100  is driven to be in the first state. 
     Step S 2 : disposing the curved cover plate on the flexible screen in a covering manner. 
     When the laminating device  1  includes a pressing station  600 , the curved cover plate  10  can be disposed in the receiving groove of the pressing station  600 , so that the pressing station  600  drives the curved cover plate  10  to move, and dispose the curved cover plate  10  on the flexible screen  20  in a covering manner. Since the flexible supporting board  100  in the first state is in the shape of a ridge, the curved cover board  10  is firstly laminated to the flexible screen  20  at the position corresponding to the central spine portion  111 . 
     Step S 3 : Applying pressure to the curved cover plate, so that the curved cover plate and the flexible screen are laminated to each other. 
     Applying pressure to the curved cover plate  10 , thereby causing that the flexible supporting board  100  is deformed from the first state to the second state. The inclination of the loading portion  112  is gradually reduced, and the two side walls  120  move away from each other. The curved cover plate  10  and the flexible screen  20  gradually laminate from the position corresponding to the central spine portion  111 . 
     In these alternative embodiments, when the curved cover plate  10  is disposed on the pressing station  600 , pressure is applied to the curved cover plate  10  through the pressing station  600 , so that the flexible supporting board  100  is deformed from the first state to the second state. The curved cover plate  10  and the flexible screen  20  are gradually laminated. Since the contact between the flexible screen  20  and the curved cover plate  10  is gradually pressed from the middle to the two sides, air bubbles can be effectively eliminated and the yield of the product can be improved. 
     The skilled person in the art should understand that the above-mentioned embodiments are all exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects.