Patent Publication Number: US-2023135080-A1

Title: Display assembly and display device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Chinese Patent Application No. 202020206585.3 filed in China on Feb. 25, 2020, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of display, in particular to a display assembly and a display device. 
     BACKGROUND 
     With the continuous development of display technology, in order to meet the different use requirements, a variety of display products with different characteristics have emerged. A foldable flexible display device is such a new type of display device with flexibility, and when a user wants to use the foldable display device, the whole flexible foldable display screen can be unfolded so as to fully unfold the flexible foldable display screen to have a larger display screen; the flexible foldable display screen can be folded when the user wants to carry it, and although the size of the display screen is sacrificed, the convenience of carrying can be effectively improved due to the small folded size. 
     In order to avoid membrane drape in folding, a steel sheet for reverse folding and pulling needs to be added on the back surface of the display assembly as a support, and a copper foil is added on the back surface of the steel sheet for heat dissipation and increasing the overall assembly strength. Due to the need for folding, the copper foil in the middle part is of disconnected design, so that part of copper foil and steel sheet cannot be grounded, resulting in electro-static discharge (ESD) failure. 
     SUMMARY 
     Embodiments of the present disclosure provide technical solutions as follows: 
     On one aspect, a display assembly is provided, including: 
     a flexible display panel, the flexible display panel including a first display area, a second display area and a bending area formed between the first display area and the second display area; 
     a metal resilient member fixedly attached to one side of the flexible display panel; 
     a metal support located on a side, away from the flexible display panel, of the metal resilient member, wherein the metal support is fixedly attached to the metal resilient member by an adhesive layer, the metal support includes a first support part arranged corresponding to the first display area and a second support part arranged corresponding to the second display area, the first support part is spaced from the second support part by a distance, and the second support part is connected to a preset grounding point; 
     a first conductive adhesive structure located at the edge of the bending area and connecting the first support part and the metal resilient member; and 
     a second conductive adhesive structure located at the edge of the bending area and connecting the second support part and the metal resilient member. 
     Optionally, the elastic modulus of the first conductive adhesive structure is greater than 1.2×105 MPa; and 
     the elastic modulus of the second conductive adhesive structure is greater than 1.2×105 MPa. 
     Optionally, the metal resilient member has a thickness no greater than 0.5 mm. 
     Optionally, the metal support has a thickness of not less than 2 mm. 
     Optionally, the metal resilient member is made of steel. 
     Optionally, the metal support is made of copper. 
     Optionally, when the flexible display panel is not bent, the first conductive adhesive structure forms an inclined plane at a first acute angle with the flexible display panel, the first acute angle being not greater than 45°; and 
     the second conductive adhesive structure forms an inclined plane at a second acute angle with the flexible display panel, wherein the second acute angle is not greater than 45°. 
     Optionally, the display assembly further includes: 
     a flexible printed circuit board provided on a side, away from the flexible display panel, of the second support part, wherein the preset grounding point is a grounding point of the flexible printed circuit board. 
     Optionally, the display assembly further includes: 
     a polarizer located on a side, away from the metal resilient member, of the flexible display panel; and 
     an encapsulation film located on a side, away from the flexible display panel, of the polarizer. 
     Another embodiment of the present disclosure further provides a display device including the display assembly as described above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of a display assembly of the related art; 
         FIG.  2    is a schematic diagram of a display assembly according to an embodiment of the present disclosure; 
         FIG.  3    is a schematic diagram of the bending of a display assembly according to an embodiment of the present disclosure; 
         FIG.  4    is a schematic diagram of stress distribution when a assembly is bent according to the related art; and 
         FIG.  5    is a schematic diagram of stress distribution when a assembly is bent according to an embodiment of the present disclosure. 
     
    
    
     REFERENCE NUMERALS 
       1 , Flexible display panel 
       2 , Metal resilient member 
       3 ,  4  Adhesive layer 
       51 , First support part 
       52 , Second support part 
       6 , Flexible printed circuit board 
       61 , Preset grounding point 
       7 , Polarizer 
       8 , Optical adhesive 
       9 , Encapsulation film 
       10 , First conductive adhesive structure 
       11 , Second conductive adhesive structure 
     A, First display area 
     B, Second display area 
     C, Bending area 
     D, Bending force direction 
     E, Stress distribution area 
     DETAILED DESCRIPTION 
     In order to make the technical problems to be solved, technical solutions and advantages of the present disclosure clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments. 
       FIG.  1    is a schematic diagram of a display assembly of the related art, and as shown in  FIG.  1   , the display assembly includes: a flexible display panel  1  including a first display area A, a second display area B and a bending area C formed between the first display area A and the second display area B, a metal resilient member  2  fixedly attached to one side of the flexible display panel  1 , and a metal support located on the side, away from the flexible display panel  1 , of the metal resilient member  2 , wherein the metal resilient member  2  is fixedly attached to the flexible display panel  1  via an adhesive layer  3 ; and the metal support is fixedly attached to the metal resilient member  2  by the adhesive layer  4 , the metal support includes a first support part  51  arranged corresponding to the first display area A and a second support part  52  arranged corresponding to the second display area B, the first support part  51  is spaced from the second support part  52  by a distance, and the second supporting part  52  is connected to a preset grounding point  61 . The metal resilient member  2  is used for providing a reverse pulling force, and the metal support member is used for heat dissipation and increasing the strength of the overall display assembly; since folding is required, the middle of the metal support member is disconnected, and the first support part  51  and the second support part  52  are not connected; and since the adhesive layer  3  and the adhesive layer  4  are both of insulating structures, the first support part  51  and the metal resilient member  2  cannot be grounded, resulting in an ESD failure; in addition, when the display assembly is bent, as shown in  FIG.  4   , stress concentration tends to occur in the area E at the edge of the bending area C, and a stamping phenomenon tends to occur after the display assembly is bent, namely, drapes which are difficult to be eliminated may occur in the bending area C. 
     Embodiments of the present disclosure address the above-described problems by providing a display assembly and a display device capable of preventing ESD failure and occurrence of stamp. 
     An embodiment of the present disclosure provides a display assembly, as shown in  FIG.  2   , including: 
     a flexible display panel  1 , including a first display area A, a second display area B and a bending area C formed between the first display area A and the second display area B; 
     a metal resilient member  2  fixedly attached to one side of the flexible display panel  1 ; 
     a metal support located on the side, away from the flexible display panel  1 , of the metal resilient member  2 , wherein the metal support is fixedly attached to the metal resilient member  2  by an adhesive layer  4 , the metal support includes a first support part  51  arranged corresponding to the first display area A and a second support part  52  arranged corresponding to the second display area B, the first support part  51  is at a distance from the second support part  52 , and the second support part  52  is connected to a preset grounding point  61 ; 
     a first conductive adhesive structure  10  located at the edge of the bending area C and connecting the first supporting part  51  and the metal resilient member  2 ; and 
     a second conductive adhesive structure  11  located at the edge of the bending area C and connecting the second supporting part  52  and the metal resilient member  2 . 
     In this embodiment, a first conductive adhesive structure connecting the first support part and the metal resilient member is provided at the edge of the bending area, and a second conductive adhesive structure connecting the second support part and the metal resilient member is provided at the edge of the bending area. The metal resilient member and the metal support member are electrically connected via the first conductive adhesive structure and the second conductive adhesive structure, so that the first support part of the metal support member can be electrically connected to a preset grounding point, so as to release static electricity accumulated on the first support part; and in addition, the first conductive adhesive structure and the second conductive adhesive structure can provide a smooth transition at the break of the metal support, and can effectively reduce the stress concentration at the edge of the bending area, so as to prevent the occurrence of stamp after bending. 
     The metal resilient member  2  may be a steel sheet, and the thickness of the metal resilient member  2  is not greater than 0.5 mm in order to avoid excessive reverse pulling force generated by the metal resilient member  2 . 
     The metal support may be copper, and the thickness of the metal support is not less than 2 mm in order to ensure that the metal support provides sufficient supporting force and ensures the overall strength of the display assembly. 
     After static electricity accumulates on the first support part  51 , the static electricity on the first support part  51  can be transferred to the preset grounding point  61  for the purpose of dissipating the static electricity through the path of the first support part  51 , the first conductive adhesive structure  10 , the metal resilient member  2 , the second conductive adhesive structure  11  and the second support part  52 . 
     In addition, after static electricity accumulates on the metal resilient member  2 , the static electricity on the metal resilient member  2  can be transferred to the preset grounding point  61  via the path of the metal resilient member  2 , the second conductive adhesive structure  11  and the second support part  52 , so as to achieve the purpose of static electricity dissipation. 
     As shown in  FIG.  2   , the display assembly further includes: 
     A flexible printed circuit board  6  provided on a side, away from the flexible display panel  1 , of the second support part  52 , wherein the preset grounding point  61  may be a grounding point of the flexible printed circuit board  6 ; the grounding point of the flexible printed circuit board  6  is connected to a middle frame or a main board of the display device to achieve grounding. 
       FIG.  3    is a schematic diagram of the bending of a display assembly according to the embodiment of the present disclosure, and  FIG.  4    is a schematic diagram of stress distribution when the assembly is bent according to the related art, wherein D is the bending force direction, and as shown in  FIG.  4   , when the assembly is bent, there is a large concentrated stress distribution in the area E at the edge of the bending area C, so that the stamp is easily generated after bending.  FIG.  5    is a schematic diagram of the stress distribution when the assembly is bent according to the embodiment of the present disclosure, wherein D is the bending force direction, and as shown in  FIG.  5   , when the assembly is bent, the first conductive adhesive structure  10  and the second conductive adhesive structure  11  exist, so situation that there is a large concentrated stress near the edge of the bending area C is improved, the maximum stress value at the edge of the bending area C is reduced, and the stress distribution is more gentle, which can effectively improve the phenomenon of producing the stamp easily after bending. 
     In order to effectively improve the stress distribution at the edge of the bending area C, the elastic modulus of the first conductive adhesive layer  10  is preferably greater than 1.2×105 MPa, and the elastic modulus of the second conductive adhesive layer  11  is preferably greater than 1.2×105 MPa. 
     As shown in  FIG.  2   , when the flexible display panel  1  is not bent, the first conductive adhesive structure  10  forms an inclined plane at a first acute angle with the flexible display panel  1 , wherein the first acute angle is not greater than 45°; the first conductive adhesive structure  10  adopting such a structure can effectively improve the phenomenon of producing the stamp after the display assembly is bent; and 
     the second conductive adhesive structure  11  forms an inclined plane at a second acute angle with the flexible display panel  1 , wherein the second acute angle is not greater than 45°, and the second conductive adhesive structure  11  adopting this structure, can effectively improve the phenomenon of creating the stamp after the display assembly is bent. 
     Of course, the first conductive adhesive structure  10  is not limited to the above-mentioned structure, and the first conductive adhesive structure  10  may also extend to a side surface, away from the flexible display panel  1 , of the first support part  51  as long as the first conductive adhesive structure  10  can effectively connect the first support part  51  and the metal resilient member  2 ; the second conductive adhesive structure  11  is also not limited to the above-mentioned structure, and the second conductive adhesive structure  11  may also extend to a side surface, away from the flexible display panel  1 , of the second support part  52  as long as the second conductive adhesive structure  11  can effectively connect the second supporting part  52  with the metal resilient member  2 . 
     As shown in  FIG.  2   , the display assembly further includes: 
     a polarizer  7  located on a side, away from the metal resilient member  2 , of the flexible display panel  1 ; and 
     an encapsulation film  9  located on the side, away from the flexible display panel  1 , of the polarizer  7 , wherein the polarizer  7  and the encapsulation film  9  are adhered via an optical adhesive  8 . The polarizer  7  can effectively resist the ambient light and reduce the influence of the ambient light on the display; and the encapsulation film  9  can protect the flexible display panel  1  from water oxygen intrusion. 
     In the above-mentioned solution, the first conductive adhesive structure connecting the first supporting part and the metal resilient member is provided at the edge of the bending area, and the second conductive adhesive structure connecting the second supporting part and the metal resilient member is provided at the edge of the bending area. The metal resilient member and the metal support member are electrically connected via the first conductive adhesive structure and the second conductive adhesive structure, so that the first support part of the metal support member can be electrically connected to a preset grounding point, so as to release static electricity accumulated on the first support part; and in addition, the first conductive adhesive layer and the second conductive adhesive layer can provide a gentle transition at the break of the metal support, and can effectively reduce the stress concentration at the edge of the bending area, so as to prevent the stamp after bending. 
     Another embodiment of the present disclosure further provides a display device including the display assembly as described above. 
     The display device may be: any product or component with a display function, such as a television, a display, a digital photo frame, a mobile phone and a tablet computer, wherein the display device further includes a flexible circuit board, a printed circuit board and a back plate. 
     Unless defined otherwise, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, the terms “first, second” and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word “include” or “comprise” or the like, means that the element or component preceded by the word is inclusive of the element or component listed after the word and its equivalents, and does not exclude other elements or components. Similar terms such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Upper, lower, left, right” and the like are used merely to denote relative positional relationships, which may change accordingly when the absolute position of the object being described changes. 
     It can be understood that when an element such as a layer, film, area or substrate is referred to as being “upper ” or “lower” located on the other element, it can be “directly upper” or “lower” located on the other element or intervening elements may be present. 
     While the foregoing is directed to preferred embodiments of the present disclosure, it should be understood by those skilled in the art that various improvements and modifications may be made without departing from the principle of the present disclosure, and theses improvement and modifications shall fall within the scope of protection of the present disclosure.