Patent Publication Number: US-2023156106-A1

Title: Display module, method for manufacturing the same, and display device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a 371 of PCT application No. PCT/CN2021/0774153, filed on Feb. 23, 2021, the disclosure of which is herein incorporated by reference in its entirely. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular, relates to a display module, a method for manufacturing the same, and a display device. 
     BACKGROUND 
     With the advancement of display technologies, a series of curved display modules made of flexible materials emerge as the times require. 
     SUMMARY 
     The present disclosure provides a display module, a method for manufacturing the same, and a display device. Technical solutions are as follows. 
     According to an aspect, a display module is provided. The display module includes: 
     a curved display panel; 
     an adhesive disposed on a side of the curved display panel; and 
     a curved cover plate disposed on a side, distal from the curved display panel, of the adhesive, wherein the curved cover plate includes a polygonal cover plate body and a cover plate edge that encloses at least two sides of the cover plate body, wherein the cover plate edge is bent, relative to the cover plate body, in a direction approaching the adhesive, and at least one corner formed respectively by the cover plate body and the cover plate edge is a cambered corner, 
     wherein a thickness of a target structure at a target corner of the at least one corner is greater than thicknesses of the target structure at other positions other than the target corner, the target structure being at least one of the cover plate edge and the adhesive; and a radius of curvature of the curved display panel at the target corner is greater than a radius of curvature of a side, distal from the curved display panel, of the target structure at the target corner. 
     Optionally, the adhesive is an optically clear resin (OCR); and the target structure includes the adhesive. 
     Optionally, the target structure includes the cover plate edge. 
     Optionally, the cover plate body is a rectangle, the cover plate edge encloses four sides of the cover plate body, and four corners formed respectively by the cover plate body and the cover plate edge are all cambered corners. 
     Optionally, the rectangle is an oblong. 
     Optionally, each of the four corners is the target corner. 
     Optionally, the thicknesses of the target structure at the target corners are equal. 
     Optionally, the radii of curvature of the curved display panel at the target corners are equal. 
     Optionally, a part of the target structure at the target corner protrudes in a direction going away from the curved display panel, and 
     a radius of curvature of a side, proximal to the curved display panel, of the target structure is greater than a radius of curvature of a side, distal from the curved display panel, of the target structure. 
     Optionally, a difference between the thickness of the target structure at the target corner and thicknesses of the target structure at the other positions ranges from 3 mm to 5 mm. 
     Optionally, a thickness variation of the target structure at the other positions is less than a threshold. 
     Optionally, the curved cover plate is a flexible glass cover plate. 
     Optionally, an orthographic projection of the adhesive on the curved display panel is within the curved display panel. 
     Optionally, an orthographic projection of the curved cover plate on the curved display panel covers the curved display panel. 
     According to another aspect, a method for manufacturing a display module is provided. The method includes: 
     providing a curved display panel and a curved cover plate, wherein the curved cover plate includes a polygonal cover plate body and a cover plate edge that encloses at least two sides of the cover plate body, wherein the cover plate edge is bent, relative to the cover plate body, in a direction approaching the adhesive, and at least one corner formed respectively by the cover plate body and the cover plate edge is a cambered corner; and 
     attaching the curved display panel to the curved cover plate by an adhesive, wherein 
     a thickness of a target structure at a target corner of the at least one corner is greater than thicknesses of the target structure at other positions other than the target corner, the target structure being at least one of the cover plate edge and the adhesive; and a radius of curvature of the curved display panel at the target corner is greater than a radius of curvature of a side, distal from the curved display panel, of the target structure at the target corner. 
     Optionally, the adhesive is a liquid optically clear resin OCR; and the target structure includes the adhesive. 
     Optionally, attaching the curved display panel to the curved cover plate by the adhesive includes: 
     applying a liquid OCR material to a side of the curved display panel; 
     forming the adhesive by curing the liquid OCR material; and 
     covering a side, distal from the curved display panel, of the adhesive with the curved cover plate, wherein 
     a spraying parameter for applying the liquid OCR material at the target corner is greater than a spraying parameter for applying the liquid OCR material at other positions other than the target corner; and the spraying parameter includes a spraying density and/or a spraying speed. 
     Optionally, the target structure includes the cover plate edge. 
     According to still another aspect, a display device is provided. The display device includes: a drive circuit and the display module according to the above aspect, wherein 
     the drive circuit is connected to the display module and is configured to drive the display module for display. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For clearer descriptions of the technical solutions in the embodiments of the present disclosure, the following briefly describes the accompanying drawings required in the embodiments of the present disclosure. Apparently, the accompanying drawings in the following descriptions show merely sonic embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. 
         FIG.  1    is a schematic structural diagram of a display module according to an embodiment of the present disclosure; 
         FIG.  2    is a schematic structural diagram of a curved cover plate according to an embodiment of the present disclosure; 
         FIG.  3    is a schematic sectional view of the display module shown in  FIG.  1   ; 
         FIG.  4    is another schematic sectional view of the display module shown in  FIG.  1   ; 
         FIG.  5    is a schematic structural diagram of a display module whose target structure is an adhesive according to an embodiment of the present disclosure; 
         FIG.  6    is a schematic structural diagram of another display module whose target structure is an adhesive according to an embodiment of the present disclosure; 
         FIG.  7    is a schematic structural diagram of a display module whose target structure is a curved cover plate according to an embodiment of the present disclosure; 
         FIG.  8    is a schematic structural diagram of another display module whose target structure is a curved cover plate according to an embodiment of the present disclosure; 
         FIG.  9    is a schematic structural diagram of still another display module whose target structure is an adhesive according to an embodiment of the present disclosure; 
         FIG.  10    is a schematic diagram of an optional structure of an adhesive according to an embodiment of the present disclosure; 
         FIG.  11    is a flowchart of a method for manufacturing a display module according to an embodiment of the present disclosure; 
         FIG.  12    is a flowchart of a method for attaching a curved cover plate to a curved display panel by an adhesive according to an embodiment of the present disclosure; 
         FIG.  13    is a schematic diagram of an applying process according to an embodiment of the present disclosure; 
         FIG.  14    is a schematic diagram of a curing process according to an embodiment of the present disclosure; 
         FIG.  15    is a schematic diagram of an attaching process according to an embodiment of the present disclosure; 
         FIG.  16    is a schematic structural diagram of yet another display module according to an embodiment of the present disclosure; and 
         FIG.  17    is a schematic structural diagram of a display device according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following further describes the present disclosure in detail with reference to the accompanying drawings. 
     Currently, a curved display module generally includes: a curved cover plate, a display panel, and an optically clear adhesive (OCA) disposed between the curved cover plate and the display panel and used for bonding them. 
     However, the display panel in the curved display module is extremely prone to wrinkling at a corner of the curved cover plate, resulting in a low attachment yield of the curved display module. 
       FIG.  1    is a schematic structural diagram of a display module according to an embodiment of the present disclosure. As shown in  FIG.  1   , the display module may include: a curved display panel  10 , an adhesive  20  disposed on a side of the curved display panel  10 , and a curved cover plate  30  disposed on a side, distal from the curved display panel  10 , of the adhesive  20 . The curved display panel  10  and the curved cover plate  30  may be attached by the adhesive  20 . 
       FIG.  2    is a schematic structural diagram of a curved cover plate according to an embodiment of the present disclosure. As shown in  FIG.  2   , the curved cover plate  30  may include a polygonal cover plate body  301  and a cover plate edge  302  that encloses at least two sides of the cover plate body  301 . The cover plate edge  302  is bent, relative to the cover plate body  301 , in a direction X 1  proximal to the adhesive  20 ; and at least one corner α formed respectively by the cover plate body  301  and the cover plate edge  302  may be a cambered corner. The cambered corner may also be referred to as a rounded corner. With reference to the figures, the rounded corner actually refers to a circular cambered corner formed by replacing an original corner with a circular arc being tangent to two sides of the corner. 
     For example, both the cover plate bodies  301  shown in  FIG.  1    and  FIG.  2    are rectangles, that is, the cover plate body  301  includes four sides. Accordingly, the cover plate edge  302  may enclose four sides S 1 , S 2 , S 3 , and S 4  of the cover plate body  301 . Four corners α may be formed respectively by the cover plate body  301  and the cover plate edge  302 , and each corner α may be a cambered corner. In some embodiments, the cover plate body  301  may alternatively be of other shapes, for example, a triangle. 
     At least one corner α of the curved cover plate  30  is a cambered corner. Therefore, the curved display panel  10  that is attached with the curved cover plate  30  may naturally transit to a curved shape at the cambered corner, that is, a part, at the cambered corner, of the curved display panel  10  may be curved, which means that the curved display panel  10  needs to be compressed. For example, in the case that the curved display panel  10  is the rectangle shown in  FIG.  1   , every two adjacent sides of the curved display panel  10  need to be compressed. In response to the curved display panel  10  being compressed beyond a compression ratio that the curved display panel  10  can bear, wrinkles may be formed at a part of the curved display panel  10  at the cambered corner, or even cracks may be formed, thereby resulting in a low attachment yield and a poor display effect. The greater a degree of curvature is, the easier wrinkles are formed. 
     According to the display module according to this embodiment of the present disclosure, a design of non-uniform thickness described in the following embodiments is applied to a target structure in structures of the cover plate edge  301  of the curved cover plate  30  and the adhesive  20 , such that a degree of curvature of the curved display panel  10  at the target corner α is greatly reduced. Accordingly, a compression degree of the curved display panel  10  is reduced, such that the compression degree is far less than the largest compression ratio that the curved display panel  10  can bear. In this way, the curved display panel  10  in the display module according to this embodiment of the present disclosure is less prone to wrinkling at the corner. The target structure refers to at least one of structures of the cover plate edge  301  and the adhesive  20 . In other words, the target structure actually refers to the cover plate edge  301  and/or the adhesive  20 . The target corner α refers to any one of the at least one corner α formed respectively by the cover plate body  301  and the cover plate edge  302 . 
     Optionally, in this embodiment of the present disclosure, a thickness of the target structure in the structures of the cover plate edge  302  of the curved cover plate  30  and the adhesive  20  at the target corner α in the at least one corner α may be greater than thicknesses of the target structure at other positions other than the target corner α, that is, the cover plate edge  302  and/or the adhesive  20  in the display module may be designed to have different thicknesses at different positions, namely, non-uniform thicknesses. 
     In addition, on the premise that the target structure has a non-uniform thickness, a radius of curvature (also referred to as a bending radius) of the curved display panel  10  at the target corner α may be greater than a radius of curvature of a side, distal from the curved display panel  10 , of the target structure at the target corner α. That is, a radian of the target structure at the target corner α is increasingly greater in a direction going away from the curved display panel  10 . In other words, the non-uniform thickness design may refer to increasing a thickness of a side, proximal to the curved display panel  10 , of the target structure. 
     For example,  FIG.  3    shows a sectional view, in a direction MM′, of the display module shown in  FIG.  1    by using an example in which the target structure is the adhesive  20 .  FIG.  4    shows a sectional view, in a direction MM′, of the display module shown in  FIG.  1    by using an example in which the target structure is the cover plate edge  302 . It can be learned with reference to  FIG.  1    and  FIG.  3    that a thickness d 1  of the adhesive  20  at the target corner α is greater than thicknesses d 1  of the adhesive  20  at other positions other than the target corner α. In addition, a radius of curvature r 1  of the curved display panel  10  at the target corner α is greater than a radius of curvature r 2  of a side, distal from the curved display panel  10 , of the adhesive  20  at the target corner α. It can be learned with reference to  FIG.  1    and  FIG.  4    that a thickness d 2  of the cover plate edge  302  at the target corner α is greater than thicknesses d 2  of the cover plate edge  302  at other positions other than the target corner α. In addition, a radius of curvature r 1  of the curved display panel  10  at the target corner α is greater than a radius of curvature r 3  of a side, distal from the curved display panel  10 , of the cover plate edge  302  at the target corner α. 
     With reference to  FIG.  1    and  FIG.  4   , compared with the related art, the degree of curvature (namely, a radian) of the curved display panel  10  at the target corner α is obviously reduced. Accordingly, a smooth curving transition of the curved display panel  10  can be achieved at the target corner α. In this way, the curved display panel  10  is less prone to wrinkling at the target corner α, and is further less prone to cracking. In addition, a stress of the curved display panel  10  at the target corner α is reduced. The display module is endowed with a high attachment yield and a good display effect. 
     In addition, on the premise of a high attachment yield, a display part of the curved display panel  10  may be designed as including the target corner α, that is, the curved display panel  10  can normally display at the target corner α. In this way, a good display of the display module is ensured. 
     In summary, according to the display module according to this embodiment of the present disclosure, the display module includes the curved display panel and the curved cover plate that are attached by the adhesive. At least one corner formed respectively by the cover plate body and the cover plate edge of the curved cover plate is a cambered corner. The thickness of the target structure in the structures of the cover plate edge and the adhesive at the target corner is greater than thicknesses of the target structure at the other positions, and the radius of curvature of the curved display panel is greater than the radius of curvature of the side, distal from the curved display panel, of the target structure. Therefore, a smooth transition of the curved display panel can be achieved at the target corner, that is, the curved display panel is less prone to wrinkling at the target corner. The display module according to this embodiment of the present disclosure has a high attachment yield. 
     Optionally, the adhesive  20  described in this embodiment of the present disclosure may be a liquid optically clear resin (OCR), which may also be referred to as a liquid optically clear adhesive (LOCA). 
     Because the OCR is a liquid optical adhesive, a thickness of the OCR may be controlled and adjusted locally. Further, the OCR may be designed to have a non-uniform thickness described in the foregoing embodiments, so as to acquire the display module shown in  FIG.  3   . That is, for the display module shown in  FIG.  3   , the target structure described in this embodiment of the present disclosure may be the adhesive  20 . 
     Referring to  FIG.  4   , the target structure described in this embodiment of the present disclosure may further include the cover plate edge  302  of the curved cover plate  30 . That is, the curved cover plate  30  that has a structure shown in  FIG.  4    can be directly acquired to prepare the display module. 
     In the case that the target structure is the cover plate edge  302 , the adhesive  20  does not need to be designed to have a non-uniform thickness. In this way, a dispensing process does not need to be improved, a manufacturing process is simplified, and a manufacturing cost is reduced. 
     It should be noted that, in a current display module, the adhesive  20  used for attaching the curved display panel  10  and the curved cover plate  30  is a solid optically clear adhesive (OCA) whose thickness cannot be controlled locally. In addition, the cover plate edge  302  of the current curved cover plate  30  is designed to have a uniform thickness, that is, a thickness of the cover plate edge  302  at the corner is the same as thicknesses of the cover plate edge  302  at other positions. In this way, the curved display panel  10  in the current display module inevitably wrinkles at the corner, resulting in a low attachment yield. With reference to the foregoing descriptions, in this embodiment of the present disclosure, the OCA may be replaced with the OCR, and the OCR may be designed to have a non-uniform thickness such a degree of curvature of the curved display panel  10  at the corner is reduced; and/or, the curved cover plate  30  with the cover plate edge  301  that has a non-uniform thickness may be used to reduce the degree of curvature of the curved display panel  10  at the corner. 
     Optionally, the cover plate edge  301  of the curved cover plate  30  described in this embodiment of the present disclosure is bendable. Therefore, the curved cover plate  30  may be a flexible glass cover plate. Accordingly, the curved cover plate  30  may also be referred to as cover glass (CG). 
     Optionally, with reference to  FIG.  2   , the cover plate body  301  described in this embodiment of the present disclosure may be a rectangle. The cover plate edge  302  encloses four sides of the cover plate body  301 . Four corners α formed respectively by the cover plate body  301  and the cover plate edge  302  are all cambered corners. For example, the rectangle may be an oblong with long edges and short edges shown in  FIG.  2   . The long edges are relatively longer than the short edges. In other words, the short edges are relatively shorter than the long edges. 
     Optionally, with reference to  FIG.  2    again, the target corner may be any one of the four corners α of the display module that is a rectangle described in this embodiment of the present disclosure. That is, a thickness of the target structure at each corner may be greater than thicknesses of the target structure at the other positions. 
     For example,  FIG.  5    is a schematic diagram of a display module by using an example in which the target structure is the adhesive  20  and the display module is a rectangle.  FIG.  6    is a top view of a display module by using  FIG.  5    as an example. It can be learned with reference to  FIG.  5    and  FIG.  6    that a thickness d 1  of the adhesive  20  at each corner α is greater than thicknesses d 1  of the adhesive  20  at other positions. In addition,  FIG.  5    only shows an upper edge part B 1  and a lower edge part B 2  of the display module.  FIG.  6    only shows the curved display panel  10  and the adhesive  20 . 
     For example,  FIG.  7    is a schematic diagram of a display module by using an example in which the target structure is the cover plate edge  301  and the display module is a rectangle.  FIG.  8    is a top view of a display module by using  FIG.  7    as an example. It can be learned with reference to  FIG.  7    and  FIG.  8    that a thickness d 2  of the cover plate edge  301  at each corner α is greater than thicknesses d 2  of the cover plate edge  301  at other positions. In addition,  FIG.  7    only shows an upper edge part B 1  and a lower edge part B 2  of the display module.  FIG.  8    only shows the curved cover plate  30 . 
     By setting a thickness of the target structure at each corner to be greater than thicknesses of the target structure at other positions, degree of curvatures of the curved display panel  10  at corners are relatively small. In this way, the curved display panel  10  is less prone to wrinkling at corners. In the case that the display module is a rectangle, a display part of the display module may include the four corners, such that the display module is endowed with an amazing and rich display effect. 
     Optionally, in this embodiment of the present disclosure, thicknesses of the target structure at the target corners α may be equal. For example, with reference to  FIG.  5    to  FIG.  8   , thicknesses of the target structure at the four corners α are equal. 
     In this way, it can be ensured that degrees of curvature of the curved display panel  10  at the corners α are consistent, further increasing an attachment yield and improving a display effect. 
     Optionally, with reference to  FIG.  1    and  FIG.  5    to  FIG.  8   , in the display module according to this embodiment of the present disclosure, radii of curvature r 1  of the curved display panel  10  at the target corners α may be equal. In this way, it can be further ensured that the degree of curvatures of the curved display panel  10  at the corners α are consistent. 
     For example, by setting thicknesses of the target structure at the target corners α to be equal, radii of curvature r 1  of the curved display panel  10  at the target corners α are made equal 
     Optionally, with reference to the foregoing accompanying drawings and  FIG.  9   , in this embodiment of the present disclosure, a part of the target structure at the target corner α may protrude in a direction Y 1  distal from the curved display panel  10 . 
     In addition, with reference to  FIG.  9    and  FIG.  10   , a radius of curvature r 2 _ 1  of a side, proximal to the curved display panel  10 , of the target structure may be greater than a radius of curvature r 2 _ 2  of a side, distal from the curved display panel  10 , of the target structure. That is, radians of the target structure at the target corner α are increasingly great in a direction going away from the curved display panel  10 . In this way, it can be effectively ensured that a radius of curvature of the curved display panel  10  at the target corner α is relatively great, and a degree of curvature of the curved display panel  10  at the target corner α is relatively small. 
     Optionally, in this embodiment of the present disclosure, a thickness variation of the target structure at other positions other than the target corner α may be less than a threshold. That is, with reference to  FIG.  9   , thicknesses of parts of the target structure at the other positions may be consistent as far as possible. In this way, an attachment yield is further increased, and a better display effect is achieved. 
     It should be noted that both the target structures shown in  FIG.  9    and  FIG.  10    are the adhesive  20 . 
     Optionally, in this embodiment of the present disclosure, a difference between the thickness of the target structure at the target corner α and thicknesses of the target structure at the other positions may range from 3 mm to 5 mm. For example, in the case that the thicknesses of the target structure at the other positions are 3 mm, the thickness of the target structure at the target corner α may be approximately 6 mm to 8 mm. 
     It should be noted that the thickness difference is merely an example for description, and may vary depending on different display modules. 
     Optionally, with reference to the display module shown in  FIG.  1   , in this embodiment of the present disclosure, an orthographic projection of the adhesive  20  on the curved display panel  10  may be within the curved display panel  10 . In addition, an orthographic projection of the curved cover plate  30  on the curved display panel  10  may cover the curved display panel  10 . That is, a relationship of area sizes of the curved display panel  10 , the adhesive  20 , and the curved cover plate  30  may be as follows: the area size of the curved cover plate  30  is greater than the area size of the curved display panel  10 , and the area size of the curved display panel  10  is greater than the area size of the adhesive  20 . 
     In summary, this embodiment of the present disclosure provides a display module. The display module includes the curved display panel and the curved cover plate that are attached by the adhesive. At least one corner formed respectively by the cover plate body and the cover plate edge of the curved cover plate is a cambered corner. The thickness of the target structure in the structures of the cover plate edge and the adhesive at the target corner is greater than thicknesses of the target structure at the other positions, and the radius of curvature of the curved display panel is greater than the radius of curvature of a side, distal from the curved display panel, of the target structure. Therefore, a smooth transition, at the target corner, of the curved display panel can be achieved, which means that the curved display panel is less prone to wrinkling at the target corner. The display module according to this embodiment of the present disclosure has a high attachment yield. 
       FIG.  11    is a flowchart of a method for manufacturing a display module according to an embodiment of the present disclosure, wherein the method may be used to manufacture the display module described in the foregoing embodiments. As shown in  FIG.  11   , the method may include the following processes. 
     In process  1101 , a curved display panel and a curved cover plate are provided. 
     Referring to  FIG.  2   , the curved cover plate  30  according to this embodiment of the present disclosure may include a polygonal cover plate body  301  and a cover plate edge  302  that encloses at least two sides of the cover plate body  302 . The cover plate edge  302  is bent, relative to the cover plate body  301 , in a direction approaching an adhesive  20 , and at least one corner α formed respectively by the cover plate body  301  and the cover plate edge  302  may be a cambered corner. 
     In process  1102 , the curved display panel and the curved cover plate are attached by the adhesive. 
     Referring to the structure shown in any one of  FIG.  3    to  FIG.  8   , a thickness of a target structure at a target corner in the at least one corner α is greater than thicknesses of the target structure at other positions other than the target corner α, the target structure being at least one of the cover plate edge  302  and the adhesive  20  in the display module, and a radius of curvature of the curved display panel  10  at the target corner is greater than a radius of curvature of a side, distal from the curved display panel  10 , of the target structure at the target corner. 
     In summary, according to the method for manufacturing a display module according to this embodiment of the present disclosure, the thickness of the target structure at the target corner is greater than thicknesses of the target structure at the other positions, the target structure being at least one of the cover plate edge and the adhesive in the display module manufactured using the method, and the radius of curvature of the curved display panel at the target corner is relatively great. In this way, a smooth transition of the curved display panel at the target corner can be achieved. Therefore, the curved display module is less prone to wrinkling at the target corner, and the display module is endowed with a higher attachment yield. 
     Optionally, the adhesive described in this embodiment of the present disclosure may be a liquid OCR. Accordingly, in an optional implementation, with reference to  FIG.  3   ,  FIG.  5   ,  FIG.  6   ,  FIG.  9   , and  FIG.  10   , the target structure may be the adhesive. In this way, with reference to the flowchart of the method shown in  FIG.  12   , process  1102  may include the following processes. 
     In process  11021 , a side of the curved display panel is applied with a liquid OCR material. 
     For example, with reference to a structural diagram of a process shown in  FIG.  13   , in this embodiment of the present disclosure, an applying device (for example, a dispenser) may be used to apply a liquid OCR material  20 _ 1  to a side of the curved display panel  10 . In addition, to enable a thickness of the adhesive  20  at the target corner α to be greater than thicknesses of the adhesive  20  at other positions, referring to  FIG.  13   , a spraying parameter for applying the liquid OCR material at the target corner α using the applying device is greater than a spraying parameter for applying the liquid OCR material at other positions other than the target corner α using the coating device. 
     Optionally, the spraying parameter may include a spraying density and/or a spraying speed. The spraying density may refer to an amount of the applied liquid OCR material, and the spraying speed may refer to an applying speed of the liquid OCR material. That is, thicknesses of the adhesive  20  at different positions can be controlled by varying a spraying parameter of the applying device in this embodiment of the present disclosure. 
     For example, it can be learned from  FIG.  13    that, an amount of the liquid OCR material  20 _ 1  applied using the applying device on a side of the curved display panel  10  at the target corner α is relatively great, whereas an amount of the liquid OCR material  20 _ 1  applied using the applying device on the side of the curved display panel  10  at other positions is relatively small. That is, a density of the liquid OCR material applied using the applying device at the target corner α is greater than a density of the liquid OCR material applied at other positions. 
     The spraying parameter is not limited in this embodiment of the present disclosure. Any adjustable parameter that can enable a thickness of the adhesive  20  at the target corner α to be greater than thicknesses of the adhesive  20  at other positions may be used as the spraying parameter. 
     It should be noted that a non-uniform thickness design can be achieved by changing a spraying parameter of the applying device. Therefore, the applying device can be used to complete the applying by the one-time applying process (also referred to as spraying), which is more efficient. 
     In process  11022 , the adhesive is formed by curing the liquid OCR material. 
     For example, referring to a structural diagram of a process shown in  FIG.  14   , upon completion of the applying of the liquid OCR material, a curing device, for example, an ultraviolet lamp (UV lamp) may be used to cure the liquid OCR material applied on a side of the curved display panel, so as to form the adhesive  20  that is in a semi-flow state. This process may also be referred to as pre-hardening of the liquid OCR material. 
     In process  11023 , a side, distal from the curved display panel, of the adhesive is covered with the curved cover plate. 
     For example, referring to a structural diagram of a process shown in  FIG.  15   , upon formation of the adhesive  20 , the acquired curved cover plate  30  can be disposed to cover the adhesive  20 , so as to acquire the display module having the structure shown in  FIG.  16   . 
     In another optional implementation, referring to  FIG.  4   ,  FIG.  7   , and  FIG.  8   , the target structure described in this embodiment of the present disclosure may include the cover plate edge  301  of the curved cover plate  30 . 
     Optionally, the curved cover plate shown in  FIG.  4   ,  FIG.  7   , and  FIG.  8    may be formed through the following process. A layer of material (for example, flexible glass) is firstly welded on a part, at the target corner, of the cover plate edge  301  upon cutting, so as to increase a thickness of the cover plate edge  301  at the target corner; and then a series of operations such as outside shape processing, cleaning, and inspection, as well as hot pressing are performed. 
     In summary, according to the method for manufacturing a display module according to this embodiment of the present disclosure, the thickness of the target structure at the target corner is greater than thicknesses of the target structure at the other positions, the target structure being at least one of the cover plate edge and the adhesive in the display module manufactured using the method, and the radius of curvature of the curved display panel at the target corner is relatively great. In this way, a smooth transition of the curved display panel can be achieved at the target corner. Further, the curved display panel is less prone to wrinkling at the target corner. Therefore, the display module is endowed with a higher attachment yield. 
       FIG.  17    is a schematic structural diagram of a display device according to an embodiment of the present disclosure. As shown in  FIG.  17   , the display device may include a drive circuit  100  and the display module  200  described in the foregoing embodiments. The drive circuit  100  may be connected to the display module  200  and configured to drive the display module  200  for display. 
     Optionally, the display device may be an organic light-emitting diode (OLED) display device, a liquid crystal display device, an active-matrix organic light-emitting diode (AMOLED) display device, a mobile phone, a tablet computer, a flexible display device, a television, a display, and any other products or components with a display function. 
     In the embodiments of the present disclosure, the term “and/or” is merely used to indicate association relationships of associated objects, and represent that there may be three relationships. For example, A and/or B may include three cases: only A exists, both A and B exist, and only B exists. 
     Described above are merely optional embodiments of the present disclosure, but are not intended to limit the present disclosure. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.